Study on startup transient vibration of a vehicle （研究启动车辆的瞬态振动）.pdfVIP

Study on startup transient vibration of a vehicle with 3-cylinder engine Jianghua Fu1,2; Jian Pang 1,2*; Chengtai Hu1,2; Xiaomin Xu1,2; Renwei Deng1,2; Xiaohong Kuang1,2 1 Changan Auto Global RD Center, China 2 State Key laboratory of Vehicle NVH and Safety Technology, China * Correspondence author, e-mail address: pangjian@ ABSTRACT The vibration of 3-cylinder engine is bigger than the 4-cylinder engine with the same engine displacement. The startup processing is studied in order to control the shake level when the engine is started. Excitation characteristics of the 3-cylinder engine is analyzed and a CAE model to analyze the startup shake is established which is verified by the test data. The possible impact factors of the startup vibration are studied and the key control methods are provided, which are applied to an case and successful results are obtained. The results show that the powerplant mounting system has a great influence on the startup vibration of the vehicle with 3-cylinder engine. Aligning the modal frequency distribution between the 3-cylinder engine mounting system and the cranking speed of the start motor, the vehicle transient shake at startup can be effectively controlled. The paper also provides a CAE simulation method which is successfully used to predict the startup shake, which provide a guideline for powerplant mounting system design at early stage of the vehicle development. Keywords: 3-cylinder engine, Startup vibration, NVH Simulation, Vibration Control I-INCE Classification of Subjects Number(s): 46.2 1. INTRODUCTION Durability, safety and NVH are among the most important performaces for a vehicle usage . The customers have been paid more and more attention on noise and vibration. The