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IDLE VIBRATION REDUCTION OF A DIESEL SPORT UTILITY VEHICLE

Title
IDLE VIBRATION REDUCTION OF A DIESEL SPORT UTILITY VEHICLE
Author
류석원
Alternative Author(s)
류석원
Advisor(s)
정진태
Issue Date
2022. 8
Publisher
한양대학교
Degree
Doctor
Abstract
This paper develops an integrated dynamic model of a diesel sport utility vehicle (SUV) and presents a study on the idle vibration reduction using this model. To reduce idle vibration, the transfer paths of vibration from the engine to the driver seat floor were investigated with the vehicle components related to idle vibration. Furthermore, operational deflection shape (ODS) tests were carried out to visualize the vibration shapes in idle condition and experimental modal analyses (EMA) were also performed to obtain the natural frequencies and mode shapes. Through the ODS tests and EMA, the vibration characteristics of the diesel SUV were identified during idling. Considering these vibration characteristics, a multi-body dynamic model for the diesel SUV described by differential equations of motion was established to evaluate idle vibration. The initial model is the most simplified model, and the final model is the model that extends the body floor from the intial model. To implement the dynamic model more specifically, the equivalent stiffnesses and damping coefficients included in the model were determined experimentally or analytically. The established dynamic model was verified by comparing the natural frequencies and the idle vibration levels between simulations. As a result, the model that better predicts the idle vibration was utilized as the final model for the study of vibration reduction. Based on the selected dynamic model, author analyzed the effects of various design parameters on idle vibration and determined important design parameters through parametric study and sensitivity analysis. In addition, design optimization was performed for reducing the idle vibration level. The cause of the reduction was identified by analyzing the natural frequencies and frequency response function of the optimal design. Finally, author presents design guide to reduce the idle vibration of a diesel SUV.
URI
http://hanyang.dcollection.net/common/orgView/200000626789https://repository.hanyang.ac.kr/handle/20.500.11754/174931
Appears in Collections:
GRADUATE SCHOOL[S](대학원) > MECHANICAL DESIGN ENGINEERING(기계설계공학과) > Theses (Ph.D.)
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