OBSI and How it is Being Used in Texas. Presented by: John Wirth from TxDOT At RPUG Conference 10/28/2008
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1 OBSI and How it is Being Used in Texas Presented by: John Wirth from TxDOT At RPUG Conference 10/28/2008
2 What is OBSI? On-Board Sound Intensity
3 Standard Method of Test for Measurement of Tire/Pavement Noise Using the On-Board Sound Intensity (OBSI) Method AASHTO Designation: TP 76-08
4 Single Probe OBSI Dual Probe OBSI
5 Single Probe OBSI 4 3
6 Research Program Goals - Construction/Pavement (CST) - Improved Designs - Safety/Durability (+)...and Quieter - Measurement Protocol...OBSI - Environmental (ENV) - Avoid Impacts = Avoid Noise Barriers - Measurement Protocol...SPB and OBSI - SPB compared to TNM Average - Seek FHWA approved adjustment in TNM Status: Collecting Data - Two OBSI systems (TxDOT and CTR) - According to AASHTO TP Standard
7 Data Collection Objectives and Work Plan Objectives - Process development - Characterize Texas pavements - Factors - Trends - Noise Families - Information support (CST- M&P) - Design guidelines - Project-level support - Facts / information exchange - Policy support (ENV) - Policy decision support - Facts / information exchange
8 Action Plan - Become familiar with OBSI - Participate in state and national OBSI discussions - Analyze data collected, try to understand data types - Test Section selection (4 8 sites / sect.) - Monitoring schedule - Collection coordination (TxDOT/CTR) - Database management
9 Action Plan continued - Test Sections tested to date by Family - PFC 24 - Other 2 - SMA 1 - Seal coat 1 - Micro-Surface 4 - PCC 8 - Additional Test Sections planned
10 TxDOT & CTR OBSI Test Sections Collected to Date - PFC 24 - Other 2 - SMA 1 - Seal coat 1 - Micro-Surface 4 - PCC 8
11 One Noise Test Section with 6 OBSI Test Sites OBSI Site 440
12 Overall Level (dba) Tire/Pavement Noise Sound Intensity Flexible Pavement Test Sections - TxDOT & CTR US281/PFC_AR1 10/9/06 US281/PFC_AR1 12/6/06 US281/PFC_AR1 9/26/07 US281/PFC_AR1 9/3/08 SH6/PFC 9/29/06 Hwy183/PFC US90/PFC US281/PFC_AR 2 9/26/07 RM620/PFC IH35/PFC IH35 NB/PFC IH10 Y5/PFC 8/9/07 US281/PFC_AR 2 10/9/06 US281/PFC_AR 2 12/6/06 SH6/PFC 9/4/08 FM1431 /PFC IH35 Waco/PFC 9/29/06 IH35 SB/PFC US290 Y6/PFC IH 30/PFC After US290 Y1/PFC IH10 Y5/PFC 8/7/08 SL360 /PFC SH146/PFC SH6/PFC SH242/PFC IH45/PFC FM734/CMHB-C US183/CRCP SL8/CRCP SH130/CRCP 6/2/08 US281/TY C IH 30/CRCP Before US290/CRCP SL8/CRCP FM1826/ChpSeal US183/CRCP SH288/CRCP Test Section Not PFC
13 Overall Level (dba) Tire/Pavement Noise Sound Intensity Microsurface Pavement Test Sections, Near Marshall, TX - Comparison SH IH20_3 MS-EB IH20_1EB #1 IH 20_3 MS-WB IH20_1WB #4-6 IH20_1EB #2-3 IH20_3 SMA-EB IH20_2EB #8-9 IH20_2WB #10-12 IH20_2EB # Test Section
14 Texas OBSI Rodeo s 9/6/2007 & 7/15/2008 Participants TxDOT CTR The Transtec Group, Inc.
15 Items to Note: TxDOT & CTR Used Single Probe OBSI System Larson Davis Analyzer 2001 Chevrolet Malibu Test Vehicle 15 Tiger Paw AWP Test Tire (9/6/07 CTR & TxDOT) 16 Tiger Paw SRTT Test Tire (7/15/08 TxDOT only) Transtec Used Dual Probe OBSI (TGI Design 9/6/07) Used Dual Probe OBSI (Donavan Design 7/15/08) Transtec Designed Sound Analyzer Buick Test Vehicle 16 Tiger Paw SRTT Test Tire
16 Overall Level (dba) Tire/Pavement Noise Sound Intensity Local Rodeo Test Sections - Site Comparison Site #1 - FM 734 In Front of RRISD Stadium 4 Total Test Sections Total Test Sections, can completed in one loop Site #2 - US 183 North and South of McNeil Site #3 - IH 35 Near Buda Parmer/CMHB-C Hwy183/CRCP Hwy183/CRCP IH35 NB/PFC 76-22TR IH35 SB/PFC 76-22S 4 SB + 3 NB10 7 Total Test Sections, can completed in one loop Day 1, Site #1 & #2 Day 2, Site #3 Test Section
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21 2007 Local OBSI Rodeo - TxDOT vs TGI - Austin, TX US Newer Concrete IH 35 SB - PFC FM CMHB-C TxDOT TGI Diff TxDOT TGI Diff TxDOT TGI Diff 5T T #1T T T #2T T T #3T T T #4T T Avg Avg Avg Avg Diff of Runs 2.5 Avg Diff of Runs 1.3 Avg Diff of Runs 3.9 US Older Concrete IH 35 NB - PFC TxDOT TGI Diff TxDOT TGI Diff 10T T T T T T T T Avg Avg Avg Diff of Runs 1.6 Avg Diff of Runs 0.8
22 CTR Original Data Collection on 9/6/2007 Tire/Pavement Noise Sound Intensity OBSI Local Rodeo Test Sections - Comparison CTR vs TxDOT 1:1 Linear (CTR vs TxDOT) y = 1.001x R 2 = TxDOT
23 TxDOT & CTR Original Data Collection on 9/6/2007 Tire/Pavement Noise Sound Intensity OBSI Local Rodeo Test Sections - Comparison FM 734 TxDOT FM 734 CTR US 183 Newer TxDOT US 183 Newer CTR US 183 Older TxDOT US 183 Older CTR IH 35 SB TxDOT IH 35 SB CTR IH 35 NB TxDOT IH 35 NB CTR 1: TGI
24 TxDOT & CTR Original Data Collection on 9/6/2007 Tire/Pavement Noise Sound Intensity OBSI Local Rodeo Test Sections - Comparison TxDOT CTR 1:1 Linear (CTR) Linear (TxDOT) y = x R 2 = y = 0.855x R 2 = TGI
25 SRTT AWP
26 AWP Tire
27 SRTT Tire
28 2007 Local OBSI Rodeo - TxDOT vs TGI - Austin, TX Follow-Up with TxDOT using a SRTT Tire: Data Collected on 7/15/08 US Newer Concrete FM CMHB-C TxDOT TGI Diff TxDOT TGI Diff 5T #1T T #2T T #3T T #4T 9T #5T Avg Avg Avg Diff of Runs 1.5 Avg Diff of Runs 1.2 US Older Concrete TxDOT TGI Diff 0.7 dba = Tire Age Difference 10T dba = Microphone Spacing 11T dba = Environmental Correction 12T T dba = Average Difference FM T Avg Avg Diff of Runs 0.8
29 CTR Follow-Up Data Collection on 7/15/2008 Tire/Pavement Noise Sound Intensity OBSI Local Rodeo Test Sections - Comparison Follow-Up with TxDOT using a SRTT Tire: Data Collected on 7/15/ CTR vs TxDOT 1:1 Linear (CTR vs TxDOT) y = x R 2 = TxDOT
30 TxDOT & CTR Follow-Up Data Collection on 7/15/ Tire/Pavement Noise Sound Intensity OBSI Local Rodeo Test Sections - Comparison Follow-Up with TxDOT using a SRTT Tire: Data Collected on 7/15/08 TxDOT CTR 1: Linear (CTR) Linear (TxDOT) y = x R 2 = y = x R 2 = TGI
31 Overall Level (dba) Tire/Pavement Noise Sound Intensity US 183 Test Section - 9T - 9/6/ T-TX 9T-CTR 9T-TGI Frequency Range Analyzed
32 Overall Level (dba) Tire/Pavement Noise Sound Intensity US 183 Test Section - 9T - 7/15/ T-TX 9T-CTR 9T-TGI Frequency Range Analyzed
33 Overall Level (dba) Tire/Pavement Noise Sound Intensity FM 734 OBSI Local Rodeo Test Sections - New Vs Older SRTT Tire Comparison Tires Run on TxDOT & Transtec Vehicles - 7/15/ TxDOT & TxDOT SRTT Tire TxDOT & TGI SRTT Tire TGI & TGI SRTT Tire TGI & TxDOT SRTT Tire #1T #2T #3T #5T Avg Test Section
34 SPTC Noise Pooled Fund Other DOTs Noise Studies International Tours / Studies AASHTO SCOM / JToP/ NCHRP Design / Policy Jeff Seiders Volpe/FHWA Acoustic Center TRB Noise Session Noise Std ETG Manuel Trevino Conc Branch Lisa Lukefahr RTI German Claros Research CTR Terry / Manuel PAM Branch John Wirth Magdy Mikhail ENV Mike Shearer ENV Policy Flex Branch Dale Rand FHWA
35 Special thanks for help and support: CTR The Transtec Group (Rob Rasmussen) Dr Paul Donavan (Illingworth & Rodkin, Inc)
36 Thank You! John Wirth Texas Department of Transportation 125 E 11 th St CST/M&P-BC39 Austin, TX Phone: (512) jwirth@dot.state.tx.us
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