Sound transmission across plenum windows with non-parallel glass panes
|
|
- Leslie Patterson
- 5 years ago
- Views:
Transcription
1 Sound transmission across plenum windows with non-parallel glass panes S.K. TANG 1 1 The Hong Kong Polytechnic University, Hong Kong, China ABSTRACT Plenum windows, which take the form of a partially opened double glazing window, have attracted the attention of both government officials and researchers in the past several years because of their high sound insulation loss and their allowance for reasonable level of natural ventilation. However, it is very difficult to improve their sound insulation capacity as the gaps between the window panes are always restricted because of the building facade thickness. Application of sound absorption is basically not practical unless the material is transparent and thin. In this study, an attempt is made to examine how a small inclination of the indoor side window pane can affect the overall sound insulation of the plenum window. It is found that there is a 2dB sound insulation increase when the window panes are non-parallel and the source is relatively close to the window. The improvement becomes less obvious as the source distance increases, but improvement can still be observed by an appropriate revision of the window pane inclination Keywords: Sound insulation, Transmission I-INCE Classification of Subjects Number(s): INTRODUCTION Noise from ground traffic has long been a major source of pollution in dense built environment. Within the already very congested urban space, conventional noise mitigations, such as noise barrier and enclosure, are not effective. Setback is basically not possible as it will mean scarifying the very precious urban land. Closing windows or using double glazing windows (1) are not solutions as they do not allow for natural ventilation and are not recommended by the local authority. Noise mitigation devices which can be attached to a building façade are therefore attractive alternatives. While the balcony is not very effective unless sound absorption materials are installed within its cavity (2,3), the plenum windows are shown to be able to offer good sound insulation and at the same time allow for a reasonable level of natural ventilation (4). This plenum window design (See Figure 1) has attracted attention in the past few years. (a) (b) Figure 1 Plenum window design. (a) Vertical plenum window; (b) PolyU hostel Red rectangles : window openings; arrow : air movement path 1 shiu-keung.tang@polyu.edu.hk 1168
2 A plenum window is a partially opened double glazing window (5). The outer and the inner window openings are staggered so that sound cannot propagate directly across it. The gap between the two glass panes together with the openings forms an air passage, allowing outdoor air to ventilate the indoor space. Figure 1 shows the schematics of this window design and a practical application adopted by The Hong Kong Polytechnic University (PolyU) Homantin Student Hostel. Tong et al. (6) reported some findings from a field mockup tests using a busy trunk road as the noise source. So far, the additional acoustical benefit of replacing a conventional casement window (which meets the minimum ventilation requirement of local authority) by a plenum window is between 8 to 9 dba for traffic noise control application. There have been efforts on enhancing the acoustical protection of the plenum window. Kang and Brocklesby (7) studied the effect of micro-perforated absorbers (MPA) and Tang (8) investigated how sound absorption can improve the performance of the PolyU plenum window. However, as a window, daylighting penetration and aesthetics are the most important issues. The conventional opaque sound absorption is not applicable. The small gap size also limits the application of the MPA. The conclusion of Tang (8) is that the MPA has to be used together with conventional sound absorber for maximal performance of the plenum window. Since the space within the plenum window void is limited and high transparency for view and daylight penetration is essential, there is not much room for the improvement of plenum window acoustical performance. Since internal reflection may help reducing sound transmission across a façade device (9), the effects of inclination of the inner glass pane on the sound transmission loss across the plenum window are examined by using a scale model inside the anechoic chamber of PolyU in the present study. The effects of the source distance d on the sound transmission loss are also studied. 2. EXPERIMENTAL SETUP All the experiments in this study were carried out insider the PolyU anechoic chamber. A scale model of scale down ratio 1: 4 was adopted. Figure 2 shows the setup. The receiver chamber was a 1:4 scaled down model of the PolyU reverberation chamber as in Tong and Tang (10). The model was made of 18mm varnished plywood panels. The source was an array consisted of ten 6-inch aperture loudspeakers. The loudspeakers were so tilted such that their normal axes pointed directly to the height level of the outer window pane edge. Scale model Plenum Window h d Loudspeaker array Figure 2 The scale model and the sound source 1169
3 The plenum window used in this study was of the vertical type (7,8) and its size was 500mm (Height, h) by 300mm (Width) by 150mm (Depth). The window panes were made of 3mm thick acrylic sheet and its frame 18mm varnished plywood panels. The outer window pane was kept vertical, while the inner window pane could be tilted at three different inclination angles (θ) with the vertical plane : -5º, 0º and +5º as shown in Figure 3. Since the gap size, g, was limited at 100mm, the inclination angle θ of the inner window pane was also limited to within ±5º. The inner window opening was fixed at 200mm. The window sill was at a height of 200mm above the chamber floor. Figure 3 Inclination angle definition The acoustical performance of the plenum window was described in term of insertion loss, IL. In this study, IL was defined as the reduction in noise level inside the model receiver room compared to the reference case where the window was fully opened (that is, with the window panes removed) after correction for the reverberation effect : RC i, ref IL = + i NLi, ref NLi, plenum 10 log10, (1) RCi, plenum where the suffices ref and plenum denotes quantities related to the reference case and the test plenum window case respectively, NL the noise levels inside the model, RC the room constant and i the ith 1/3 octave band. NLs were measured using 13 microphones uniformly spanned over the entire receiver room volume. The data acquisition system was the Brüel & Kjær 3560D PULSE system with a sampling rate of samples per second per channel. The corresponding A-weighted traffic noise insertion losses, IL A, were obtained by applying the EN normalized traffic noise spectrum (11) to IL i : ( R i ILi ) 0.1Ri IL A = 10log , (2) i= 1 i= 1 where Rs are the normalized traffic noise spectral weightings. The loudspeaker outputs were kept constant throughout the present study. In the foregoing discussions, the sound frequencies are scaled back to the full scale model. 3. RESULTS AND DISCUSSIONS The reverberation inside a receiver room can be increased by replacing a casement window with a 1170
4 plenum window provided that the window opening size w h/2. The maximum w was h/2, above-which some sound might be able to pass directly across the plenum window. In the present study, the reverberation times (RTs) were estimated by averaging the results obtained from the 13 microphones inside the receiver room. Figure 4 illustrates the frequency variations of RTs. As a preliminary study, w was fixed at h/2 throughout the experiment. This opening window size is comparable to that of the PolyU hostel plenum window. 1.0 Reverberation Time (sec) θ = 0º θ = +5º θ = -5º Open window One-third Octave Band Centre Frequency (Hz) Figure 4 Reverberation times of the receiver room One can observe that the small variation of inclination angle, no matter it is positive or negative, tends to reduce the RTs at frequencies below the 1000Hz one-third octave band. However, the presence of the plenum window did make the receiver room more reverberant in general, and thus Eq. (1) is essential for reflecting the actual acoustical protection of the plenum window as the reverberation tends to increase the noise level inside the receiver room θ = 0º θ = +5º θ = -5º IL A (dba) Source Distance (m) Figure 5 Variation of plenum window insertion loss with source distance Figure 5 shows the combined effects of w and d on the A-weighted traffic noise insertion losses IL A. The source distances have been scaled back to the full scale condition. It can be observed that tilting the inner window pane can improve the acoustical performance of the plenum window in 1171
5 general. When the source is close to the window, the increase in IL A is ~2dBA and for 6m d 8m, the improvement can be up to 3dBA. In general, a positive inclination angle tends to produce better insertion loss for d > 4m in general. The direction of the inclination does not affect the IL A at small source distances. The positively inclined inner window pane tends to reflect more direct and diffracted sound back toward the edge region of the outer window pane and thus the better IL A in general. However, the effect is not so significant compared to its negative counterpart. There are two source distances d = 4m and 10m where the inclination does not improve the IL A. The exact reason for this is not clear and it is left to further investigation. 4. CONCLUSIONS A series of scale model experiments was derived in this study to investigate how the inclination of the inner window pane of a plenum window can help improve the acoustical performance of the window. The scale down ratio adopted was 1:4. Owing to the small gap size of a plenum window, the inclination angle was limited to within ±5º. The installation of the plenum window increased the reverberation inside the receiver room compared to the case of open window. The inclination of the inner window pane reduced the reverberation strength at lower frequencies. The A-weighted traffic noise insertion loss of the plenum window in general decreased with increasing source distances. The inclination also helps increasing the insertion loss in general. The improvement was around 2dBA for short source distance and can be as high as 3dBA as the latter increased. However, there were source distances at which the improvement was not significant and it is left to further investigation. ACKNOWLEDGEMENTS This work is supported financially by a grant from the Research Grant Council, the Hong Kong SAR Government under Project no. PolyU152164/15E. REFERENCES 1. Tadeu AJB, Mateus DMR. Sound transmission through single, double and triple glazing. Experimental evaluation. Appl Acoust. 2001;62(3): Tang SK. Noise screening effects of balconies on a building façade. J Acoust Soc Am. 2005;118(1): Lee PJ, Kim YH, Jeon JY, Song KD. Effects of apartment building façade and balcony design on the reduction of exterior noise. Bldg Environ. 2007;42(10): Kang J. An acoustic window system with optimum ventilation and daylighting performance. Noise Vib. Worldwide 2006;37(1), Ford RD, Kerry G. The sound insulation of partially open double glazing. Appl Acoust. 1973;6(1): Tong YG, Tang SK, Kang J, Fung A, Yeung MKL. Full scale field study of sound transmission across plenum windows. Appl Acoust. 2015;89: Kang J, Brocklesby BM. Feasibility of applying micro-perforated absorbers in acoustic window systems. Appl Acoust. 2005;66(6): Tang SK. Acoustical protection of a plenum window installed with sound absorptions. Proc INTER-NOISE 2015; 9-12 August 2015; San Francisco, USA Paper no Ishizuka T, Fujiwara K. Traffic noise reduction at balconies on a high-rise building façade. J Acoust Soc Am. 2012;131(3): Tong YG, Tang SK. Plenum window insertion loss in the presence of a line source - a scale model study. J Acoust Soc Am. 2013;133(3): BS EN , Road traffic noise reducing devices Test methods for determining the acoustic performance Part 3. Normalized traffic noise spectrum. BSI: London;
Acoustical Benefits of Plenum Window as Facade Device A Parametric Study
Acoustical Benefits of Plenum Window as Facade Device A Parametric Study Yean Ghing Tong 1,*, and Shiu-keung Tang 2 1 Jamilus Research Centre, Universiti Tun Hussein Onn Malaysia, 86400 Parit Raja, Johor,
More informationAcoustic design of the air transparent soundproofing wall
PROCEEDINGS of the 22 nd International Congress on Acoustics Materials for Noise Control: Paper ICA2016-323 Acoustic design of the air transparent soundproofing wall Seong-Hyun Lee (a), Junghwan Kook (b),
More informationExperimental investigation of high airflow rate ventilation system with improved noise performance by passive and active means
Experimental investigation of high airflow rate ventilation system with improved noise performance by passive and active means C. Guigou-Carter, J. Maillard and R. Wetta CSTB - Center for Building Science
More informationinter.noise 2000 The 29th International Congress and Exhibition on Noise Control Engineering August 2000, Nice, FRANCE
Copyright SFA - InterNoise 2000 1 inter.noise 2000 The 29th International Congress and Exhibition on Noise Control Engineering 27-30 August 2000, Nice, FRANCE I-INCE Classification: 0.0 EFFECTS OF TRANSVERSE
More informationSpecial edition paper
Countermeasures of Noise Reduction for Shinkansen Electric-Current Collecting System and Lower Parts of Cars Kaoru Murata*, Toshikazu Sato* and Koichi Sasaki* Shinkansen noise can be broadly classified
More informationReduction of vehicle noise at lower speeds due to a porous open-graded asphalt pavement
Reduction of vehicle noise at lower speeds due to a porous open-graded asphalt pavement Paul Donavan 1 1 Illingworth & Rodkin, Inc., USA ABSTRACT Vehicle noise measurements were made on an arterial roadway
More informationThe application of microperforated material to control axial fan noise
Purdue University Purdue e-pubs Publications of the Ray W. Herrick Laboratories School of Mechanical Engineering 4-2015 The application of microperforated material to control axial fan noise Seungkyu Lee
More informationACTIVE NOISE CONTROL EXPERIMENTS IN A FORK-LIFT TRUCK CABIN
Abstract ACTIVE NOISE CONTROL EXPERIMENTS IN A FORK-LIFT TRUCK CABIN L. Andrén, S. Johansson, M. Winberg and I. Claesson Department of Signal Processing Blekinge Institute of Technology SE-37 5 Ronneby,
More informationEffect of road surfaces on road traffic noise on the public roads of Japan. --An investigation based on tyre/road noise measurement--
Effect of road surfaces on road traffic noise on the public roads of Japan --An investigation based on tyre/road noise measurement-- Hiroshi Koike 1 ; Akiyoshi Ito 2 1,2 Japan Automobile Research Institute,
More informationretrofitted building such as a This work has been referred to advantage the change active and protection. protection and night-time
Development of an innovative retrofitted building window for Catherine Guigou-Carter, François Olive, Michel Perraudeau, Roland Wetta CSTB, 24 Rue Joseph Fourier, 38400 Saint Martin d Hères, France. Fabio
More informationGifu Univ. 1-1 Yanagido, Gifu City, Gifu Prefecture, , Japan
Evaluation of sound absorbing performance of CFRP acoustic panel prototype formed using media blasting Hitoshi Fukagawa 1, a, Daiki Ichikawa 1,b, and Satomi Kawashima 1,c 1 Gifu Univ. 1-1 Yanagido, Gifu
More informationPrediction of exterior sound field of an automotive for airborne excitation and transmission to the interior of the vehicle
Prediction of exterior sound field of an automotive for airborne excitation and transmission to the interior of the vehicle Arnaud Caillet 1 ; Antoine Guellec 2 ; Ludovic Dejaeger 3 ; Arthur Henry 1 1
More informationNoise Resist. - you need to improve the noise reduction of your existing sound enclosure
Noise Resist Is this your situation? - you need to reduce the noise emission of your machinery - you need to improve the noise reduction of your existing sound enclosure - you do not want delicate foam
More informationProject Location. I-80 Toll Plaza at I-480/I-80 Interchange, Lorain County, Ohio
Geoffrey Pratt - Bowlby & Associates, Inc. William Bowlby - Bowlby & Associates, Inc. Kim Burton - Burton Planning Services, LLC Elvin Pinckney - Burton Planning Services, LLC Noel Alcala - Ohio Department
More informatione t Performance of Extended Inlet and Extended Outlet Tube on Single Expansion Chamber for Noise Reduction
e t International Journal on Emerging Technologies 7(1): 37-41(2016) ISSN No. (Print) : 0975-8364 ISSN No. (Online) : 2249-3255 Performance of Extended Inlet and Extended Outlet Tube on Single Expansion
More information6. Acoustical simulation of straight and side inlet/outlet rectangular plenums using the FEM method
Research Signpost 37/661 (2), Fort P.O. Trivandrum-695 023 Kerala, India Noise Control: Theory, Application and Optimization in Engineering, 2014: 119-144 ISBN: 978-81-308-0552-8 Editors: Min-Chie Chiu
More informationFriction Characteristics Analysis for Clamping Force Setup in Metal V-belt Type CVTs
14 Special Issue Basic Analysis Towards Further Development of Continuously Variable Transmissions Research Report Friction Characteristics Analysis for Clamping Force Setup in Metal V-belt Type CVTs Hiroyuki
More informationImprovements of Existing Overhead Lines for 180km/h operation of the Tilting Train
Improvements of Existing Overhead Lines for 180km/h operation of the Tilting Train K. Lee, Y.H. Cho, Y. Park, S. Kwon Korea Railroad Research Institute, Uiwang-City, Korea Abstract The purpose of this
More informationPerformance of Solar Flat plate by using Semi- Circular Cross Sectional Tube
Performance of Solar Flat plate by using Semi- Circular Cross Sectional Tube Alok Kumar 1 1 National Institute of Technology Patna, kumargaurav4321@gmail.com and 9576288028 Abstract Solar flat plate collector
More informationImproving muffler performance using simulation-based design
Improving muffler performance using simulation-based design Fangsen CUI 1 *; Ying WANG 2 ; Richard Chao CAI 3 1 Institute of High Performance Computing, A*STAR, Singapore 2 Jinan Dejia Machine Pte Ltd,
More informationTHE UNIVERSITY OF HONG KONG LIBRARIES. Hong Kong Collection
THE UNIVERSITY OF HONG KONG LIBRARIES Hong Kong Collection TECHNICAL MEMORANDUM ON NOISE FROM PERCUSSIVE PILING Environmental Protection Department Noise Control Authority This Technical Memorandum, originally
More informationCircular Silencer. Rigid and flexible construction Type CA CB CF CS. TROX GmbH Telephone +49/28 45/ Telefax +49/28 45/
6/5/EN/6 Circular Silencer Rigid and flexible construction Type CA CB CF CS TROX GmbH Telephone +49/28 45/2 02-0 Telefax +49/28 45/2 02-2 65 Heinrich-Trox-Platz e-mail trox@trox.de D-47504 Neukirchen-Vluyn
More informationStudy of Motoring Operation of In-wheel Switched Reluctance Motor Drives for Electric Vehicles
Study of Motoring Operation of In-wheel Switched Reluctance Motor Drives for Electric Vehicles X. D. XUE 1, J. K. LIN 2, Z. ZHANG 3, T. W. NG 4, K. F. LUK 5, K. W. E. CHENG 6, and N. C. CHEUNG 7 Department
More informationExperimental Investigation of Sound Pressure Levels Variation During Modulation of a Compressor in a Unit Case Study
Purdue University Purdue e-pubs International Compressor Engineering Conference School of Mechanical Engineering 2006 Experimental Investigation of Sound Pressure Levels Variation During Modulation of
More informationTechnical Annex to PPR490 The acoustic durability of timber noise barriers on England s strategic road network
Published Project Report PPR490 Technical Annex Technical Annex to PPR490 The acoustic durability of timber noise barriers on England s strategic road network P A Morgan Transport Research Laboratory
More informationResearch and analysis of noise emitted by vehicles according to the type of surface roads and driving speed
European Journal of Environmental and Safety Sciences 2014 2(2): 71-78 ISSN 1339-472X European Science and Research Institute (Original Research Paper) Research and analysis of noise emitted by vehicles
More informationA Low Friction Thrust Bearing for Reciprocating Compressors
Purdue University Purdue e-pubs International Compressor Engineering Conference School of Mechanical Engineering A Low Friction Thrust Bearing for Reciprocating Compressors Shuhei Nagata shuhei.nagata.wq@hitachi.com
More informationVariations of Exhaust Gas Temperature and Combustion Stability due to Changes in Spark and Exhaust Valve Timings
Variations of Exhaust Gas Temperature and Combustion Stability due to Changes in Spark and Exhaust Valve Timings Yong-Seok Cho Graduate School of Automotive Engineering, Kookmin University, Seoul, Korea
More informationRoad vehicle noise reduction by low noise road surfaces in Japan
Road vehicle noise reduction by low noise road surfaces in Japan 1 Integrated noise reduction measures Road vehicle running noise Road vehicle Tyre Pavement Traffic management Integrated Measures Road
More informationCASE STUDY OF TYRE NOISE: ASSESSMENT AND COMPARISON OF DIFFERENT ROAD SURFACES
CASE STUDY OF TYRE NOISE: ASSESSMENT AND COMPARISON OF DIFFERENT ROAD SURFACES W Mior & M H F de Salis Vipac Engineers and Scientists Ltd Unit E1-B Centrecourt, 25 Paul Street Nth North Ryde, NSW, 2113.
More informationTHE INFLUENCE OF VISIBILITY CONDITIONS IN HORIZONTAL ROAD CURVES ON THE EFFICIENCY OF NOISE PROTECTION BARRIERS
DOI: 10.1515/rjti-2015-0016 ROMANIAN JOURNAL THE INFLUENCE OF VISIBILITY CONDITIONS IN HORIZONTAL ROAD CURVES ON THE EFFICIENCY OF NOISE PROTECTION BARRIERS Tamara Džambas, Assistant, MCE, University of
More informationA study of cabin inside noise of Hanjin highspeed
A study of cabin inside noise of Hanjin highspeed passenger coaches Y.J. Lee HHIC Technical Research Institute, Hanjin Heavy Industries Ltd, 118, 2-Ka, Nadaemun-Ro, Chung Gu, Seoul, Korea Abstract Hanjin
More informationinter.noise 2000 The 29th International Congress and Exhibition on Noise Control Engineering August 2000, Nice, FRANCE
Copyright SFA - InterNoise 2000 1 inter.noise 2000 The 29th International Congress Exhibition on Noise Control Engineering 27-30 August 2000, Nice, FRANCE I-INCE Classification: 0.2 ITALIAN LEGISLATION
More informationINTERIOR NOISE OF A KOREAN HIGH-SPEED TRAIN IN TUNNELS
INTERIOR NOISE OF A KOREAN HIGH-SPEED TRAIN IN TUNNELS Sunghoon Choi, Chan-Woo Lee, Jae-Chul Kim, and Joon-Ho Cho Noise and Vibration Research Group, Korea Railroad Research Institute, Woulam-dong, Uiwang-city,
More informationside operation magnet ideal transmission side operation magnet
1 2 3 side operation magnet ideal transmission side operation magnet 4 5 6 The ScreenLine SL20P system comprises a venetian blind incorporating a 12,5 mm slat designed to be integrated in a doubleglazing
More informationLow Noise Gear Units Developed by Loading Test Rig in the Anechoic Chamber
Technology UDC 621. 833. 01-752 Low Noise Gear Units Developed by Loading Test Rig in the Anechoic Chamber Makoto KIMURA* Shoichi KONDO Hideki MINAMI Abstract Since the noise of the gear unit of the railway
More informationAvailable online at ScienceDirect. Physics Procedia 67 (2015 )
Available online at www.sciencedirect.com ScienceDirect Physics Procedia 67 (2015 ) 518 523 25th International Cryogenic Engineering Conference and the International Cryogenic Materials Conference in 2014,
More informationEnergy Density Active Noise Control in an Earthmoving Machine Cab
Minneapolis, Minnesota NOISE-CON 2005 2005 October 17-19 Energy Density Active Noise Control in an Earthmoving Machine Cab David C. Copley Caterpillar Inc. PO Box 1875 Peoria, IL 61656 Ben Faber Scott
More informationFlow Behavior and Friction Factor. in Internally Grooved Pipe Wall
Adv. Studies Theor. Phys., Vol. 8, 2014, no. 14, 643-647 HIKARI Ltd, www.m-hikari.com http://dx.doi.org/10.12988/astp.2014.4573 Flow Behavior and Friction Factor in Internally Grooved Pipe Wall Putu Wijaya
More information2011 NDIA GROUND VEHICLE SYSTEMS ENGINEERING AND TECHNOLOGY SYMPOSIUM POWER AND MOBILITY (P&M) MINI-SYMPOSIUM AUGUST 9-11 DEARBORN, MICHIGAN
211 NDIA GROUND VEHICLE SYSTEMS ENGINEERING AND TECHNOLOGY SYMPOSIUM POWER AND MOBILITY (P&M) MINI-SYMPOSIUM AUGUST 9-11 DEARBORN, MICHIGAN Electrode material enhancements for lead-acid batteries Dr. William
More informationExperimental NVH evaluation of a pure electric vehicle in transient operation modes
Experimental NVH evaluation of a pure electric vehicle in transient operation modes Rong Guo 1, Xiao-kang Wei 2, Jun Gao 3 Clean Energy Automotive Engineering Center, Tongji University, Shanghai, People
More informationAN INTAKE SILENCER FOR THE CONTROL OF MARINE DIESEL TURBOCHARGER COMPRESSOR NOISE
AN INTAKE SILENCER FOR THE CONTROL OF MARINE DIESEL TURBOCHARGER COMPRESSOR NOISE Liu Chen, Cao Yipeng, Zhang Wenping and Zhao Xiaochen Harbin Engineering University, College of Power and Energy Engineering,
More informationTEMPERATURE CHANGE OF A TYPE IV CYLINDER DURING HYDROGEN FUELING PROCESS
TEMPERATURE CHANGE OF A TYPE IV CYLINDER DURING HYDROGEN FUELING PROCESS Lee, S. H. 1, Kim, Y. G. 2, Kim, S. C. 3 and Yoon, K. B. 4 1 Institute of Gas Safety R&D, Korea Gas Safety Corp, 332-1, Daeya-dong,
More informationSound Application Guide: Description and Ratings
Sound Application Guide: Description and Ratings AHRI SOUND STANDARD: DESCRIPTION AND RATINGS Table of Contents Overview..........................................................................4 AHRI
More informationCAV controllers. Type VFL. Volume flow limiter for insertion into ducting K
.1 X X testregistrierung CAV controllers Type Aerodynamic damper blade Sticker showing volume flow rates Set the volume flow rate Insert Volume flow limiter for insertion into ducting Circular, mechanical
More informationInterim report on noise in F2C, October 2010 Rob Metkemeijer
1 Interim report on noise in F2C, October 2010 Rob Metkemeijer 1. Introduction. At the 2010 CIAM plenary it was decided that in 2010 a strategy for noise control in F2C team race will be prepared, aiming
More informationSmoke Reduction Methods Using Shallow-Dish Combustion Chamber in an HSDI Common-Rail Diesel Engine
Special Issue Challenges in Realizing Clean High-Performance Diesel Engines 17 Research Report Smoke Reduction Methods Using Shallow-Dish Combustion Chamber in an HSDI Common-Rail Diesel Engine Yoshihiro
More informationSilencers. Transmission and Insertion Loss
Silencers Practical silencers are complex devices, which operate reducing pressure oscillations before they reach the atmosphere, producing the minimum possible loss of engine performance. However they
More informationDevelopment of analytical process to reduce side load in strut-type suspension
Journal of Mechanical Science and Technology 24 (21) 351~356 www.springerlink.com/content/1738-494x DOI 1.7/s1226-9-113-z Development of analytical process to reduce side load in strut-type suspension
More informationCASE STUDY. LINK Engineering Company Inc. Resolving Customers Brake Noise Issues
CASE STUDY LINK Engineering Company Inc. Resolving Customers Brake Noise Issues United States of America Automotive PULSE Since its foundation, Link Engineering Company has focused on the design and manufacture
More informationOscillator Experiment of Simple Girder Bridge coupled with Vehicle
The 2012 World Congress on Advances in Civil, Environmental, and Materials Research (ACEM 12) Seoul, Korea, August 26-30, 2012 Oscillator Experiment of Simple Girder Bridge coupled with Vehicle Mitsuo
More informationSTUDY OF FEASIBILITY OF PLASTIC GEAR TO REDUCE NOISE IN A GEAR PUMP
http://dx.doi.org/10.14743/apem01..137 Advances in Production Engineering & Management 7 (01), 143-149 ISSN 1854-650 Scientific paper STUDY OF FEASIBILITY OF PLASTIC GEAR TO REDUCE NOISE IN A GEAR PUMP
More informationAn Automated System for the Acoustical and Aerodynamic Characterization of Small Air Moving Devices
Minneapolis, Minnesota NOISE-CON 2005 2005 October 17-19 An Automated System for the Acoustical and Aerodynamic Characterization of Small Air Moving Devices Jeff G. Schmitt David A. Nelson John Phillips
More informationEXPERIMENTAL INVESTIGATIONS OF DOUBLE PIPE HEAT EXCHANGER WITH TRIANGULAR BAFFLES
International Research Journal of Engineering and Technology (IRJET) e-issn: 2395-56 Volume: 3 Issue: 8 Aug-216 www.irjet.net p-issn: 2395-72 EXPERIMENTAL INVESTIGATIONS OF DOUBLE PIPE HEAT EXCHANGER WITH
More informationAcoustical performance of complex-shaped earth berms
coustical performance of complex-shaped earth berms Jérôme Defrance, Simon Lallement, Philippe Jean, Faouzi Koussa To cite this version: Jérôme Defrance, Simon Lallement, Philippe Jean, Faouzi Koussa.
More informationMinistry of New and Renewable Energy Block-14, CGO Complex, Lodhi Road, New Delhi ,
MNRE STD 01:2013 MNRE Standard ALL GLASS (GLASS IN GLASS) EVACUATED SOLAR COLLECTOR TUBES Ministry of New and Renewable Energy Block-14, CGO Complex, Lodhi Road, New Delhi-110 003, May 2013 1 MNRE STD
More informationTests Report Nº B2014 LACUS IN 11 TG B Laboratory measurements of airborne sound insulation
EMPLEGU ETA GIZARTE POLITIKETAKO SAILA Etxebizitza, Zuzendaritza DEPARTAMENTO DE EMPLEO Y POLÍTICAS SOCIALES Dirección de Vivienda Tests Report Nº B2014 LACUS IN 11 TG B Laboratory measurements of airborne
More informationNoise and vibration due to rotor eccentricity in a HDD spindle system
DOI 10.1007/s00542-014-2139-2 Technical Paper Noise and vibration due to rotor eccentricity in a HDD spindle system Sangjin Sung Gunhee Jang Kyungjin Kang Received: 7 October 2013 / Accepted: 8 March 2014
More informationA Different Approach to Gas Turbine Exhaust Silencing
74-GT-26 Copyright 1974 by ASME $3.00 PER COPY $1.00 TO ASME MEMBERS The Society shall not be responsible for statements or opinions advanced in papers or in discussion at meetings of the Society or of
More informationEstimation of Unmeasured DOF s on a Scaled Model of a Blade Structure
Estimation of Unmeasured DOF s on a Scaled Model of a Blade Structure Anders Skafte 1, Rune Brincker 2 ABSTRACT This paper presents a new expansion technique which enables to predict mode shape coordinates
More informationLABORATORY MEASUREMENTS OF THE REDUCTION OF TRANSMITTED IMPACT NOISE PANETTI OVERLAID BY LAMINATED FLOORING
Report No. L/3193 Page 1 of 8 for EA Mimarlik Insaat Teknolojileri San.ve. Tic.Ltd.Sti 1420/3 Sokak NO. 22 Kizilkanat Silesi D Blok D.12 Alsancak Izmir Turkey Dated: 18 July 2011 LABORATORY MEASUREMENTS
More informationEffect of Shock Induced Acoustic Emission and Shock Waves Impact on Polyurethane Foam
8 th International Symposium on NDT in Aerospace, November 3-5, 2016 Effect of Shock Induced Acoustic Emission and Shock Waves Impact on Polyurethane Foam More info about this article: http://www.ndt.net/?id=20614
More informationRailway noise mitigation factsheet 01: Overview of railway noise
Railway noise mitigation factsheet 01: Overview of railway noise 1.1 Noise sources and indicative noise levels Exterior noise sources on high-speed trains can be broadly categorised as follows and are
More informationAvailable online at ScienceDirect. Procedia CIRP 33 (2015 )
Available online at www.sciencedirect.com ScienceDirect Procedia CIRP 33 (2015 ) 581 586 9th CIRP Conference on Intelligent Computation in Manufacturing Engineering - CIRP ICME '14 Magnetic fluid seal
More informationPass-by noise, from the Real to the Simulated. The Analysis and Development for the ECE Certification MOTORCYCLES
CSI S.p.A. - CERTIFICATION of SAFETY INSTITUTE Pass-by noise, from the Real to the Simulated. The Analysis and Development for the ECE Certification www.csi-spa.com spa.com MOTORCYCLES Ing. Francesco Ballabio
More informationThe effect of grinding and grooving on the noise generation of Portland Cement Concrete pavement
The effect of grinding and grooving on the noise generation of Portland Cement Concrete pavement T. Wulf, T. Dare and R. Bernhard Purdue Univ., 140 Martin Jischke Dr., Herrick Lab., West Lafayette, IN
More informationNoise Emission Data of Danish Heavy Weapons
Noise Emission Data of Danish Heavy Weapons Waseim Alfred Environmental Department, Danish Defence, Arsenalvej 55, DK-9800, Denmark, fes-mina04@mil.dk Abstract Environmental noise caused by heavy weapons
More informationVent/Fan Silencers UNIVERSAL. Vent/Fan Silencers ENERGY ENVIRONMENTAL
Vent/Fan Silencers Vent/Fan Silencers UNIVERSAL ENERGY ENVIRONMENTAL 4.1 4.1 Rotary Positive Blower Silencers HV Series Combination Easy To Specify and Order Vent and blowdown silencers are rarely a simple
More informationSuppression of chatter vibration of boring tools using impact dampers
International Journal of Machine Tools & Manufacture 40 (2000) 1141 1156 Suppression of chatter vibration of boring tools using impact dampers Satoshi Ema a,*, Etsuo Marui b a Faculty of Education, Gifu
More informationNEGATIVE DIFFERENTIAL PRESSURE BY IGNITION OF GRANULAR SOLID PROPELLANT
23 RD INTERNATIONAL SYMPOSIUM ON BALLISTICS TARRAGONA, SPAIN 16-2 APRIL 27 NEGATIVE DIFFERENTIAL PRESSURE BY IGNITION OF GRANULAR SOLID PROPELLANT Yuichi Nakamura 1, Toshio Ishida 1, Hiroaki Miura 2, and
More informationKrantz. Floor displacement outlet Q-B-DN 200. Air distribution systems
Krantz Floor displacement outlet Q-B-DN 0 Air distribution systems DS 62 E 05. Construction design Preliminary remarks Floor displacement outlets are usually used where wall or plinth displacement outlets
More informationBeyond the Specifications: Best Practices for OBSI Measurement
Beyond the Specifications: Best Practices for OBSI Measurement Dana M. Lodico, PE Lodico Acoustics LLC TRB 89 th Annual Meeting Washington D.C. January 10, 2010 Topics Results of OBSI parameter testing
More informationReduction of Vehicle Noise at Lower Speeds Due to Quieter Pavement. By Paul R Donavan
Reduction of Vehicle Noise at Lower Speeds Due to Quieter Pavement By Paul R Donavan Project Description To Quarry Noise complaints along Pt. San Pedro Road in Marin County, CA Quarry traffic along 4 mile
More informationRectangular Silencer. Cylindrical Duct Silencer. and. Acoustic Louvres BUILDING SERVICES, INDUSTRIAL NOISE CONTROL SYSTEMS AND PRODUCTS
Rectangular Silencer Cylindrical Duct Silencer and Acoustic Louvres BUILDING SERVICES, INDUSTRIAL NOISE CONTROL SYSTEMS AND PRODUCTS INTRODUCTION AND PROJECT REFERENCES We solve all the noise problems
More informationGIS and GPS as useful tools to determine transportation noise levels
GIS and GPS as useful tools to determine transportation noise levels D. Fabjan 1, D. Paliska 1 & S. Drobne 2 1 Faculty of Maritime Studies and Transportation, University of Ljubljana, Slovenia 2 Faculty
More informationTime-Dependent Behavior of Structural Bolt Assemblies with TurnaSure Direct Tension Indicators and Assemblies with Only Washers
Time-Dependent Behavior of Structural Bolt Assemblies with TurnaSure Direct Tension Indicators and Assemblies with Only Washers A Report Prepared for TurnaSure, LLC Douglas B. Cleary, Ph.D., P.E. William
More informationDECEMBER 15-18, 1997 ADELAIDE, SOUTH AUSTRALIA. Y. K. Tso and R. G. Juniper
FIFTH INTERNATIONAL CONGRESS ON SOUND AND VIBRATION DECEMBER 15-18, 1997 ADELAIDE, SOUTH AUSTRALIA Invited Paper A STUDY OF THE TRANSMISSION OF NOISE AND VIBRATION IN AN ALUMINIUM MOTOR VESSEL Y. K. Tso
More informationInfluence of Fuel Injector Position of Port-fuel Injection Retrofit-kit to the Performances of Small Gasoline Engine
Influence of Fuel Injector Position of Port-fuel Injection Retrofit-kit to the Performances of Small Gasoline Engine M. F. Hushim a,*, A. J. Alimin a, L. A. Rashid a and M. F. Chamari a a Automotive Research
More informationVALIDATION OF NVIDIA IRAY AGAINST CIE 171:2006
VALIDATION OF NVIDIA IRAY AGAINST CIE 171:2006 PREPARED BY DAU DESIGN AND CONSULTING INC. JANUARY 28, 2016 Validation of NVIDIA Iray against CIE 171:2006 www.daudesignandconsulting.com ii TABLE OF CONTENTS
More informationInternational Conference on Mechanics, Materials and Structural Engineering (ICMMSE 2016)
International Conference on Mechanics, Materials and Structural Engineering (ICMMSE 2016) Comparison on Hysteresis Movement in Accordance with the Frictional Coefficient and Initial Angle of Clutch Diaphragm
More informationTRANSIENT MAGNETIC FLUX DENSITY MEASUREMENT RESULTS ON A FUSELAGE-LIKE TEST SETUP AND INVESTIGATION OF THE EFFECTS OF APERTURES
TRANSIENT MAGNETIC FLUX DENSITY MEASUREMENT RESULTS ON A FUSELAGE-LIKE TEST SETUP AND INVESTIGATION OF THE EFFECTS OF APERTURES S. A. Sebo, R. Caldecott, Ö. Altay, L. Schweickart,* J. C. Horwath,* L. C.
More informationAnalysis on natural characteristics of four-stage main transmission system in three-engine helicopter
Article ID: 18558; Draft date: 2017-06-12 23:31 Analysis on natural characteristics of four-stage main transmission system in three-engine helicopter Yuan Chen 1, Ru-peng Zhu 2, Ye-ping Xiong 3, Guang-hu
More informationREPEATABILITY OF CPX TYRE/ROAD NOISE MEASUREMENTS. Gillian Adams, Frits Kamst and Stephen Pugh ASK Consulting Engineers, Brisbane, Australia
ICSV14 Cairns Australia 9-12 July, 2007 REPEATABILITY OF CPX TYRE/ROAD NOISE MEASUREMENTS Gillian Adams, Frits Kamst and Stephen Pugh ASK Consulting Engineers, Brisbane, Australia frits@askce.com ABSTRACT
More informationPrediction of parking area noise in Australian conditions
Paper Number 39, Proceedings of ACOUSTICS 2011 2-4 November 2011, Gold Coast, Australia Prediction of parking area noise in Australian conditions ABSTRACT Laurence Nicol and Paul Johnson Ron Rumble Renzo
More informationEXPERIMENTAL INVESTIGATION OF THE FLOWFIELD OF DUCT FLOW WITH AN INCLINED JET INJECTION DIFFERENCE BETWEEN FLOWFIELDS WITH AND WITHOUT A GUIDE VANE
Proceedings of the 3rd ASME/JSME Joint Fluids Engineering Conference July 8-23, 999, San Francisco, California FEDSM99-694 EXPERIMENTAL INVESTIGATION OF THE FLOWFIELD OF DUCT FLOW WITH AN INCLINED JET
More informationISSN (PRINT): ,(ONLINE): ,VOLUME-2,ISSUE-4,2016 1
A STUDY ON THE ACOUSTIC PERFORMANCE OF A REACTIVE MUFFLER Shemin Thomas Varkey 1, Lalu P. P 2, K. Balakrishnan 3 1 Post Graduate Student, Government Engineering College, Thrissur, 2 Assistant Professor,
More informationNumerical Optimization of HC Supply for HC-DeNOx System (2) Optimization of HC Supply Control
40 Special Issue Challenges to Realizing Clean High-Performance Diesel Engines Research Report Numerical Optimization of HC Supply for HC-DeNOx System (2) Optimization of HC Supply Control Matsuei Ueda
More informationSwitching Impulse Flashover Tests and Analysis for 765kV Jumper V-strings with Damaged Insulators
J Electr Eng Technol Vol. 8, No. 2: 359-363, 2013 http://dx.doi.org/10.5370/jeet.2013.8.2.359 ISSN(Print) 1975-0102 ISSN(Online) 2093-7423 Switching Impulse Flashover Tests and Analysis for 765kV Jumper
More informationApplicability for Green ITS of Heavy Vehicles by using automatic route selection system
Applicability for Green ITS of Heavy Vehicles by using automatic route selection system Hideyuki WAKISHIMA *1 1. CTI Enginnering Co,. Ltd. 3-21-1 Nihonbashi-Hamacho, Chuoku, Tokyo, JAPAN TEL : +81-3-3668-4698,
More informationStudy on the compatibility of rubber materials in biodiesel derived from cottonseed oil
Study on the compatibility of rubber materials in biodiesel derived from cottonseed oil Guang Wu 1, Yongbin Lai 1, a, Li Kong 2, Lei Zhong 2 and Xiu Chen 2 1 School of Mechanical Engineering, Anhui University
More informationDesign of A Smart Automotive Ventilation System For A Parked Car
Design of A Smart Automotive Ventilation System For A Parked Car Gaurav Kumar Jaiswal 1, Mohit Gandhi 2, Sanket Phalgaonkar 3, Harshal Upadhyay 4, Ankit Agrawal 5, Vasudevan Rajamohan6, K.Ganesan 7 1,2,3,4,5,6
More informationAn Experimental Analysis on the Flow Rate in Scroll Compressors
Purdue University Purdue e-pubs International Compressor Engineering Conference School of Mechanical Engineering 1998 An Experimental Analysis on the Flow Rate in Scroll Compressors D. H. Kim LG Electronics
More informationEnhanced Accessibility in the ICC/A Pacific ADA Update Conference Presented by: Kermit Robinson, CBO International Code Council
Enhanced Accessibility in the ICC/A117.1 2017 2017 Pacific ADA Update Conference Presented by: Kermit Robinson, CBO International Code Council Requirements Scoping : What, Where and How Many 2015 IBC and
More informationCooling tests of the MSGC barrel B1 rod prototype
B1 note 98.10 August, 98 Cooling tests of the MSGC barrel B1 rod prototype Jussi Alanen Helsinki Institute of Physics Cooling system of the MSGC barrel B1 rod prototype was studied experimentally. The
More informationPerformance Evaluation of Electric Vehicles in Macau
Journal of Asian Electric Vehicles, Volume 12, Number 1, June 2014 Performance Evaluation of Electric Vehicles in Macau Tze Wood Ching 1, Wenlong Li 2, Tao Xu 3, and Shaojia Huang 4 1 Department of Electromechanical
More informationHigh Pressure Spray Characterization of Vegetable Oils
, 23rd Annual Conference on Liquid Atomization and Spray Systems, Brno, Czech Republic, September 2010 Devendra Deshmukh, A. Madan Mohan, T. N. C. Anand and R. V. Ravikrishna Department of Mechanical Engineering
More informationExperimental Study Of Effect Of Tilt Angle Of The Flap On Transverse Vibration Of Plate
Experimental Study Of Effect Of Tilt Angle Of The Flap On Transverse Vibration Of Plate P. Mahadevaswamy a*, B.S. Suresh b a Department of Mechanical Engineering, Acharya Institute of Technology, Bangalore.
More information[Rao, 4(7): July, 2015] ISSN: (I2OR), Publication Impact Factor: 3.785
IJESRT INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY CFD ANALYSIS OF GAS COOLER FOR ASSORTED DESIGN PARAMETERS B Nageswara Rao * & K Vijaya Kumar Reddy * Head of Mechanical Department,
More informationAdelaide Wind Power Project Turbine T05 (AD117) IEC Edition 3.0 Measurement Report
REPORT ID: 14215.01.T05.RP6 Adelaide Wind Power Project Turbine T05 (AD117) IEC 61400-11 Edition 3.0 Measurement Report Prepared for: Suncor Adelaide Wind General Partnership Inc. 2489 North Sheridan Way
More informationOn the prediction of rail cross mobility and track decay rates using Finite Element Models
On the prediction of rail cross mobility and track decay rates using Finite Element Models Benjamin Betgen Vibratec, 28 Chemin du Petit Bois, 69130 Ecully, France. Giacomo Squicciarini, David J. Thompson
More information