Research On Design And Optimization Of Magneto-Rheological Damper For Automobile Suspension

Suspension system is one of the important components of the vehicles, it is has a great effect on the riding comfort and the handling stability.Magneto rheological damper (MRD) is the important component of a new type of semi-active suspension system. Its damping force is real time and adjustable, according to the automobile running condition, and it improves the incongruity between the riding comfort and the handling stability in the procedure of the design of the traditional suspension better. MRD has attracted attention by academic and industrial circles.MRD is the medium with magneto rheological fluid (MRF), it changes to the magnetic field intensity by controlling the input electric current,and makes change to rheological properties of MRF in the millisecend, making the transformation between the liquid and the semisolid come true, thus, it supplies to the controlled damping force. It has the merits such as simple structure, convenient controlled, rapid response, small power consumption and larger output force, etc.. At present, there are few researches on the double-tube type Magneto-rheological damper in China, therefore, it is quite necessary to the academic research of the design and structure optimization of the double-tube type Magneto-rheological damper. For this purpose, this thesis analyzed and probed in these areas of the mechanical model, the design, the multiobjective evolutionary optimization and the test research of the double-tube type Magneto-rheological damper at detail.This paper raised a method of the design and the optimization of the double-tube type Magneto-rheological damper. First of all, it introduced several kinds of the mechanical model from the parameterization and nonparameterization and the characteristics, and derived the equation of the rheology and the formula computing of the dampering force of the shearing-valve mode MRD by the plate model. Secendly, it expounded the interrelated theory in the design at detail, and summarized steps of the design,and proposed the example of the design. It introduced the particle swarm optimization (PSO) algorithm and the essence of multi-objective optimization,and used MATLAB software to program to optimize the structure of MRD by PSO, and manufactured the test prototype of the first scheme structure and the second scheme structure of MRD, and completed the bench test. Test results showed that two kinds of the design scheme all satisfied the design requirements, but the second scheme structure solved to the problem of the dile stroke in the test of the first scheme structure by comparing with each other, and the design of the second scheme structure was more reasonable and feasible.