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Simulation and experimental study on the flow-induced noise in a hydraulic control valve system
Daehyeok Kang(강대혁),Byunghee Kwon(권병희),Jehyuk Han(한제혁),Chiho Kim(김치호),Bora Lee(이보라),Donghyeon Hwang(황동현),Cheol Park(박철) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
Generally, the control valve system in an automatic transmission (A/T) supplies automatic transmission fluid to a variety of actuators in the A/T through oil circuits to regulate the fluidic pressure of actuators. Since, discharge fluid pressure fluctuates in a certain frequency derived from hydro-mechatronics devices, it is very important to avoid hydroacoustic resonance to prevent passengers from hearing noise in cabin: when the frequency of pressure fluctuation coincides with the natural frequency of an oil circuit. However, it is challenging to predict the transient behavior of hydraulic pressure oscillating with high frequency including the amplitude of resonance pressure, because properties of automatic transmission fluid such as operating pressures change transiently in actual hydraulic control applications. This paper presents a dynamic simulation model for transient pipe flow to predict the behavior of hydraulic pressure in the time domain and a correlation with experimental data. Finally, the optimal parameter value was proposed by using the simulation model, and it was confirmed to improve cabin noise level in the actual vehicle.