Research On Suspension With Magnetorheological Damper Embedded Permanent Magnets

The suspensions, with great impact on automotive riding comfort, traveling safety and other performance, is one of the most important components of automobile chassis. Half-active suspensions are always within research focus of automobile fields, because of its low energy consumption, rapid response ability, easiness in adjusting and simple mechanic structure. However, the research on suspension with magnetorheological damper (MRD), in which permanent magnets are introduced, is rare to be seen. Comprehensive performance of MR can be greatly enhanced through introducing permanent magnets to it, which, in turn, can premote dynamic performance of automobile suspension. In this paper, mathematic models of an entire-car half-active suspension were built based on design and manufacture of magnetorheological damper embedded permanent magnets (MRDEPM); Fuzzy control algorithm, glowworm optimal algorithm(GSO)-PID control algorithm and fruit optimal algorithm(FOA)-optimal control algorithm were designed. Furthermore, a large number of simulation and experiments were conducted. The work conducted in this paper is introduced as follows:(1) In view of inadequacy of present MRDs research, new mechanic structure of MRDEPM was designed based on working principles of magnetorheological fluit. The new MRD was manufactured on the basis of working modes of magnetic field and designing theories of energy-saving damper.(2) The model of combined field in annular gap was built on the basis of the magnetic field models of electrified solenoid and line-charge model of permanent magnets. On this basis, Bingham model was employed to build mathematic models of damper and half-active suspension.(3) On the basis of above models, simulation experiments of Force vs. displacement and Force vs. velocity were carried out and the results indicated that the MRDEPM could meet the requirements of automobile suspensions. Moreover, simulation experiments on the newly designed half-active suspension were conducted under the control of different algorithms and the results indicated that working performance of suspension was desirable. Meanwhile, simulation experiments on energy consumption of the designed damper were conducted under the traffic conditions of expressway among cities and roads within cities and the results indicated that the MRDEPM suspension could save energy.(4) Iteration mode of normal FOA was developed so that it could conduct optimization of optimal controller. Meanwhile, uniform-distribution operation of fruit groups and the operation of fruit-group-radius-decrease-with-iteration-time-increase were introduced into normal FOA. On this basis, FOA-optimal control algorithm of half-active suspension was designed.(5) Rapid control prototyping (RCP) based on D2P and hardware in loop simulation (HILS) based on dSPACE of half-active suspension was built and simulation experiments were carried out and the results indicated that the working performance of MRDEPM suspension was good.(6) Bench test system of MREPM was built and experiments of Force vs. displacement and Force vs. velocity were carried out. The results indicated that the MRDEPM could meet the standard of automobile suspensions. Testing system of quarter suspension and road testing system of real vehicle were built and experiments of bench tests and road tests were carried out. The results indicated that working performance of the suspension system was good.