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Shock absorber design and control strategy based ER materials

Author: ZouYi
Tutor: GaoJianHe
School: Yangzhou University
Course: Machinery Manufacturing
Keywords: ER fluid ER fluid damper Semi - active suspension Fuzzy Control
CLC: U463.33
Type: Master's thesis
Year: 2009
Downloads: 81
Quote: 0
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Abstract


The current change material has a yield stress, fast response, low energy consumption, significant rheological effects of pollution insensitive becoming the material of choice of a new type of shock absorber. The ER damper having the characteristics of the ER effect is based on the current change material by an electric field to control the flow characteristics of the electro-rheological fluid in order to achieve control of the damping force. Generated continuously controllable damping force can achieve good vehicle ride comfort and the smoothness of this is a hot research topic in the ER technology applications. This is very different from the damping force to control the shock absorber damping channel area by changing the traditional principle of semi-active damper. New ideas, creating a semi-active damper research has important significance and broad application prospects. Starting from the point of view of the Applied Research ER fluid damper and automotive current variable semi-active suspension control strategy design with a focus on, and carried out research in the following areas: 1. Analysis of the ER fluid. ER effect and the main influencing factors; introduced the mechanical properties of the ER fluid, the analysis of the role of the various components in the ER fluid and its impact on the performance of the ER fluid; proposed and analyzed from the perspective of engineering applications the mechanical properties of the ER fluid requirements and preparation of a current becomes liquid, the mechanical properties test. 2 ER fluid damper design. Application of fluid mechanics theory, based on the constitutive equations of the Newton fluid or Bingham fluid, the the annular channel model and the slab model derived ER damper rheological equation and the damping force formula. According to the the mixed ER fluid damper operating mode, designed a simple structure of ER fluid damper, affect the the damper performance of major structural parameters are analyzed, and the shock absorber on the vibration table The acceleration characteristics experiment, to verify the effect of the shock absorber damping. 3 ER semi-active suspension fuzzy control strategy design and simulation. First, the establishment of two degrees of freedom of a quarter car suspension mathematical model and road model and suspension dynamics equation and the equation of state is derived. Design a semi-active suspension automotive ER fuzzy controller using Matlab / Simulink dynamic model and computer simulation, with passive suspension sprung mass acceleration, suspension deflections, tire dynamic load performance comparative analysis. The analysis results show that the semi-active suspension system has better damping properties than traditional passive suspension, also shows that the control strategy is feasible and can significantly improve vehicle ride comfort and handling stability.

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CLC: > Transportation > Road transport > Automotive Engineering > Automotive structural components > Travel System > Suspension
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