January 2007 Fabrice GALLO Powertrain Transmission Solution Manager POWERTRAIN TRANSMISSION NVH
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1 January 2007 Fabrice GALLO Powertrain Transmission Solution Manager POWERTRAIN TRANSMISSION NVH
2 Agenda Industry Context & Applications Presentation of the Solution Solution Portfolio Details Success story Why Imagine.Lab? 2 copyright LMS International 2007
3 Industry Challenges Reduce noise and improve durability Control of high frequencies (>40Hz) due to hydraulic dynamics, mechanical contacts, slip control. Optimize mechanical parts and architectures Component deflection leads to the need for FEA to obtain surface velocities. Simulate precisely surface, materials for given architectures. 3 copyright LMS International 2007
4 Features / Benefits FEATURES ALL frequency tools to analyze precisely the oscillations (Eigen values, modal shapes, FFT ) Linear and non-linear model are coupled together FEM models with low CPU time and non linear excitations connected together with time response BENEFITS Representation of fluid and mechanical dynamics Find the contributors of natural modes and modify them to reduce vibrations Reduce the variations of contact forces with backlash through the optimization of the number of teeth and planets 4 copyright LMS International 2007
5 Agenda Industry Context & Applications Presentation of the Solution Solution Portfolio Details Success story Why Imagine.Lab? 5 copyright LMS International 2007
6 Main points of the solution AMESim is able to simulate ANY vehicle powertrain architectures Transmission part MT/AMT/DCT (Mechanical, Automated, Dual clutch) AT/IVT/CVT (Automated, Infinitely, Continuous variable) Driveline part (Universal Joints, clutch dampers, DMF, chassis) Engine part (Crankshaft, Camshaft, valves, rocker arms) 6 copyright LMS International 2007
7 Multi-Domain skill is required Actuation Switch valves Pressure regulation Hydraulic/electric Networks Engine Crankshaft Camshaft Vibrations Torque oscillations Driveline 2D/3D Modeling U-joints, Tires ESP / ASR Piloted Differential Clutch / DMF Dry/Wet, Multidisk, dampers Thermal aspects, slip control Transmission Robotized / Automatics DCT/Hybrid IVT/CVT Shift control Synchronizers, 3D animations Epicyclic gear trains Gearshift control 7 copyright LMS International 2007 DCT model for Gear shift Comfort analysis (0-40Hz)
8 Agenda Industry Context & Applications Presentation of the Solution Solution Portfolio Details Success story Why Imagine.Lab? 8 copyright LMS International 2007
9 Main Issues The NVH solution enables to focus on NVH sources and related corrective components efficiency: Engine torsional harmonics Driveline Vibratory Analysis Dual mass flywheel Clutches dampers Idling noise (>300Hz) Winning noise (> 1 khz) 9 copyright LMS International 2007
10 NVH: Engine torsional harmonics Mode number Validated Software 313 Hz 481 Hz 1176 Hz 1925 Hz AMESim (θ=0 ) 318 Hz 482 Hz 1165 Hz 1744 Hz AMESim (θ=90 ) 318 Hz 485 Hz 1178 Hz 1766 Hz Min. differences 1.6 % 0.2% 0.2% 8.2% Variable number of cylinder (1 to 18) 10 copyright LMS International 2007
11 NVH: Driveline Vibratory Analysis Time response Modal shapes 11 copyright LMS International 2007
12 NVH: Dual mass flywheel Improving vibration comfort Friction due to centrifugal force Efficient simulation models with adequate accuracy Different operating conditions (start, idle, drive rattle, tip-in/tip-out, ) 12 copyright LMS International 2007
13 NVH: Clutches dampers Clutch damper design Hysteresis 1,2 or 3 stage springs Driveline Analysis Effects of torsional dampers on Gear Shift comfort and vehicle drivability 13 copyright LMS International 2007
14 NVH: Idling noise (>300Hz) 3D model of differential developed in order to analyze rattle noise due to gear backlash and excitation on torsional modes Use of AMESim scene editor to help the understanding and the design 14 copyright LMS International 2007
15 NVH: Winning noise (> 1 khz) Study of the balancer shafts in flexion on bearing stiffness Balancing produce itself an excitation of the gears backlash or whining noise Balancer shafts 15 copyright LMS International 2007
16 Agenda Industry Context & Applications Presentation of the Solution Solution Portfolio Details Success story Why Imagine.Lab? 16 copyright LMS International 2007
17 3D modal analysis - link to FEA Crankshaft Camshaft 3D oscillations Coupling with Non-linear bearings Coupling with Non-linear dry frictions Coupling with variable stiffnesses The implementation of the method in an AMESim model leads to: Access to temporal analysis tools Torsion of the shaft as a function of time Access to linear analysis tools Access to spectral analysis tools Order tracking : torsion of the shaft as a function of the rotary velocity 17 copyright LMS International 2007
18 NVH: Multi-Axle Transmission 18 copyright LMS International 2007
19 Agenda Industry Context & Applications Presentation of the Solution Solution Portfolio Details Success story Why Imagine.Lab? 19 copyright LMS International 2007
20 Our Solution Benefits for design process Increase final products quality & time to market and reduce costs Better physical understanding of driveline vibrations due to a coupling between linear systems with non linear ones (Dry frictions, variable stiffnesses, enstops, bearings, joints, gear backlash ) AMESim variable step solver is specialized in high dynamics simulation with fast stiffnesses variations like in hard non linear systems Reduce number of chassis dyno tests using Off-line test procedure validation Continuous process from simulation to test bench to improve durability Scaleable solutions from component to complete vehicle 20 copyright LMS International 2007
21 Thank you January 2007 Fabrice GALLO Powertrain Transmission Solution Manager
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