Frequency And Time Domain Characteristics Analysis Of Hydraulic Bushing

다국어 초록 (Multilingual Abstract)

Recently the hydraulic bushings in suspension and sub-frame system of a rear-wheel driving vehicle are adapted to improve ride quality and reduce noise and vibration. The dynamic stiffness and damping properties of these hydraulic bushings are highly dependent on the amplitude and frequency of excitation force as well as the static load, but analytical case studies about such dynamic responses are not enough. The dynamic stiffness and loss angle of a hydraulic bushing are a crucial purpose functions and it is significant to investigate the relation between the design parameter of internal structure and these functions. During the design stage of a hydraulic bushing with one fluid element, it is not easy to adjust the maximum frequency of loss angle to specific frequency of the most disruptive excitations due to geometry limitations of the fluid track. In this study, the design factors such as fluid flow passage, internal chamber are selected to affect the dynamic characteristics of hydraulic bushing. And the analytical study is implemented in several hydraulic bushing configurations with different combination of design factors. The formulation with lumped parameter model about hydraulic bushing configurations is implemented and the variation of dynamic stiffness and loss angle is examined with MATLAB simulation in time and frequency domain. Finally the feasible and practical modeling method of hydraulic bushing will be proposed.

목차 (Table of Contents)

• Abstract
• 1. Introduction
• 2. Frequency response in analytical model of hydraulic bushing
• 3. Frequency response of hydraulic busing
• 4. Time domain of hydraulic bushing
• 5. Results
• 4. Conclusion
• References