A Multi-body Dynamic Modeling and Experimental Study of EEK Noise During Clutch Engagement
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TECHNICAL ARTICLE—PEER-REVIEWED
A Multi-body Dynamic Modeling and Experimental Study of EEK Noise During Clutch Engagement Xiangbin Chen . Weimin Zhang . Guoqing Wu
Submitted: 1 July 2016 / in revised form: 19 August 2016 / Published online: 11 October 2016 ASM International 2016
Abstract A new ‘‘E-E-K’’ (bionic) noise was generated during clutch engagement. By testing the vehicles with the EEK noise, the key parts for EEK noise and the motion modes were pointed out. The module of clutch engagement process was built. The stability of the system was analyzed based on the theory of Hurwitz. Then the multi-body dynamic model of the clutch system was built, and the corresponding EEK noise-vibration model system was created. A system vibration mode corresponding with EEK noise was established in the model, which simulated and reproduced the noise and vibration mechanism of the vehicle testing. All these verified the consistency between vehicle testing and model. Based on the multi-body dynamic simulation, the key component for EEK noise had been clarified, and the further research direction of EEK noise was pointed out. Keywords EEK Noise Multi-body dynamic model Vibration Clutch NVH
Problem Finding—EEK Noise During the development of new clutch project, a new noise generated during clutch engagement was found [1, 2]. This new noise has never been found before, which is similar to the pronunciation of letter ‘‘E-E-K.’’ Therefore, we define
X. Chen W. Zhang Department of Mechanical and Energy Engineering College, Tongji University, Shanghai 201804, China X. Chen G. Wu (&) Schaeffler Trading (Shanghai) Co Ltd., Shanghai 201804, China e-mail: [email protected]
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this harsh noise as EEK noise (bionic). After a period of study and vehicle tests, we find that EEK noise has a constant frequency and is independent of the engine’s speed. The noise frequency is in the range of 250–500 Hz [3, 4]. Figure 1 shows the EEK noise measurement and analysis of one test vehicle; when the clutch pedal is released and clutch is engaged, EEK noise occurs and the frequency is always 370 Hz during clutch engagement. It can be seen that EEK noise frequency will not be changed by the engine speed or transmission speed.
Mechanism Research on EEK Noise In the primary research tests, we study a certain factor’s contribution to EEK noise from clutch disc, pressure plate, flywheel, and transmission, respectively, and have confirmed that the noise source is the clutch system [5, 6]. To confirm the key parameters that affect EEK noise and its vibration model further, we instrumented a test vehicle where EEK was detected to experience that phenomenon deeper (Fig. 2) [7, 8]. Parameters of the vehicle with EEK noise are shown in Table 1. In the test, the clutch is engaged under different rotation speeds and engagement speeds (1800 rpm and 2500 rpm, respectively), and different vehicle driving conditions can be simulated by changing the clutch torque, engagement, and release time. Following data are recorded during the tests: release lo
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