A VIBROACOUSTICS MODEL OF AUTOMOTIVE TORQUE CONVERTER
2022-01-0371
03/29/2022
- Event
- Content
- Torque Converter (TC) is mounted on the drivetrain between engine and gearbox, and transfers power from the engine to the transmission system. TC components such as turbine, pump, stator, damper assembly and fluid medium help to achieve the torque required. At stall conditions, there is a fluctuation of fluid pressure inside the TC which excites the structural components. This fluctuation generates noise within the system, which is observed inside the cabin, at an uncomfortable level for the customer. In this work, an attempt is made to simulate the physics of structural and fluid coupling to find out and resolve what creates the noise. To understand this system behavior, modal analysis is performed for complete TC assembly and the critical modes are identified. Followed by modal analysis, frequency response analysis is performed to acquire the dynamic response of the TC assembly. Here the harmonic load curve is from a computational fluid dynamics (CFD) simulation to replicate the real behavior of the test condition. Then the harmonic velocity is fed into the acoustic system where anechoic chambers are modelled to measure the noise level of the TC. This noise measurement is compared with the test results, various parameters which influence the noise levels are identified and design proposals are given. In this paper, discussed in detail is the acoustics methodology by considering the pressure load from fluid by coupling the structural vibration system. This fluid coupling helps us to understand the impact of fluid pressure in vibration. The design parameters which influence the system amplifications are discussed in detail. Finally the simulation results are compared with test results to understand the gap between virtual & reality Keywords: Harmonics, Vibration, Acoustics, FSI Coupling, Noise Influence parameter
- Citation
- Duraipandi, A., yang PhD, Z., RAJENDHRAN, D., Krishnan, P. et al., "A VIBROACOUSTICS MODEL OF AUTOMOTIVE TORQUE CONVERTER ," SAE Technical Paper 2022-01-0371, 2022, .