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At present, vehicles generally used the passive suspension, which is consisted of the flexibility components and the shock absorber. Due to the suspension system¡¯ parameter was fixed, it chooses compromise for the conflicting design requirements, such as the operate stability and ride comfort and so on, but as to the automobile in volatile work environment, the passive suspension is difficult to satisfy anticipant performance requirements. According to the road situation, the active suspension can adjust to and produce the necessary suspension control between the wheels and the body in a timely, which contain the body¡¯s vibration, so that the suspension keep in the optimal damping state, at the same time, and achieve the purpose on improve the ride comfort and operate stability of the vehicle . It can be said that, this is an important direction of the development research of the automobile suspension in future. Therefore, aim at this problem, the paper put up for modeling, simulation study. Firstly, according to the Newton theorem, the paper use the vehicle dynamics theory, and set up the dynamics model of the passive suspension and the second freedom active suspension system based on a quarter of the body. Taking into account an important impact of the road surface disturbance to enter for the suspension control, and enter the road input and the initiative to control signals with input, as to further simplify the form of the differential equations. And translate the differential equations into a form of expression of the state equations. And establish the road roughness mathematical model of the road input signal for sine, step random and white noise signal, and achieve the simulation. At the same time, outlined the three eva luation index of the suspension performance, such as the body vertical acceleration, the relatively dynamic load of the wheel, the suspension dynamic deflection. And build the simulation model plans of the control system of the automobile suspension by the Matlab7.0/Simulink software, including the importable model of the road, the passive suspension model, the active suspension model of the PID control. And run the simulation model map to achieve the simulation of the different input signal of the suspension control system. Finally, according to several different road of the incentive signal under the different control means, and analysis the simulation results of the eva luation index of the suspension performance in-depth. This paper can provide theoretical foundation and numerical reference for the experimental research and product development of the active suspension. Keywords: Vehicle engineering Active suspension MATLAB Modeling PID control Simulation Ä¿ ¼ Ŀ¼1 ÖÐÎÄÕªÒª3 Abstract4 µÚÒ»Õ Ð÷ÂÛ5 1.1 Ñо¿±³¾°6 1.2 Ñо¿µÄÄ¿µÄÓëÒâÒå7 1.3 Ñо¿µÄÖ÷ÒªƒÈÈݼ°·½·¨7 µÚ¶þÕ Ðü¼ÜµÄ¸ÅÊö¼°ÀàÐÍ9 2.1 Ðü¼ÜµÄ¸ÅÊö9 2.2 Ðü¼ÜµÄÀàÐÍ9 2.2.1 ±»¶¯Ðü¼Ü10 2.2.2 °ëÖ÷¶¯Ðü¼Ü11 2.2.3 Ö÷¶¯Ðü¼Ü12 2.2.4 ¸÷ÖÖÐü¼ÜÐÔÄܱȽÏ14 µÚÈýÕ Ðü¼ÜµÄϵͳ½¨Ä£ÓëÐÔÄÜÆÀ¼Û15 3.1 ÒýÑÔ15 3.2 Æû³µÖ÷¶¯Ðü¼ÜµÄ¹¤×÷Ô­Àí15 3.3 Æû³µÖ÷¶¯Ðü¼ÜµÄ¶¯Á¦Ñ§Ä£ÐÍ16 3.3.1 ³£ÓõĻù±¾³µÌåÄ£Ð͵ļò»¯¼°¼Ù¶¨Ìõ¼þ17 3.3.2 »ùÓÚËÄ·ÖÖ®Ò»³µÌåµÄ±»¶¯Ðü¼Ü¶¯Á¦Ñ§Ä£Ð͵Ľ¨Á¢18 3.3.2 »ùÓÚËÄ·ÖÖ®Ò»³µÌåµÄÖ÷¶¯Ðü¼Ü¶¯Á¦Ñ§Ä£Ð͵Ľ¨Á¢19 3.4 Ëæ»ú·ÃæÄ£ÐÍ20 3.4.1 ·Ã治ƽ¶ÈµÄ¹¦ÂÊÆ×ÃܶÈ20 3.4.2 ¿Õ¼äÆ×ÃܶÈÓëʱ¼äÆ×ÃܶȵÄת»¯21 3.5 Ðü¼ÜµÄÐÔÄÜÆÀ¼Û±ê×¼24 µÚËÄÕ Ö÷¶¯Ðü¼ÜPID¿ØÖÆÀíÂÛµÄÑо¿25 4.1 PID¿ØÖƵļò½é25 4.2 PID¿ØÖÆÔ­Àí26 4.3 Ö÷¶¯Ðü¼ÜϵͳµÄPID¿ØÖÆ27 4.4 PID¿ØÖƵIJÎÊýÕû¶¨29 µÚÎåÕ Ðü¼ÜµÄ½¨Ä£¼°·ÂÕæ30 5.1 ·ÂÕæ»·¾³½éÉÜ30 5.1.1 MATLABµÄ¼ò½é30 5.1.2 SIMULINKµÄ¼¼Êõ¼ò½é31 5.2 Ö÷¶¯Ðü¼Ü·ÂÕæ¿ØÖÆÄ£Ð͵Ľ¨Á¢32 µÚÁùÕ Ðü¼ÜµÄ·ÂÕæ¹ý³Ì¼°·ÖÎö41 6.1 ³µÁ¾Ðü¼Ü·ÂÕæ¹ý³Ì42 6.2 ³µÁ¾Ðü¼Ü·ÂÕæ½á¹û·ÖÎö42 6.2.1 ²»Í¬¿ØÖÆ·½·¨ÏµĻÉÔØÖÊÁ¿¼ÓËٶȵıȽÏ43 6.2.2 ²»Í¬¿ØÖÆ·½·¨ÏµÄÐü¼Ü¶¯ÄӶȵıȽÏ46 6.2.3 ²»Í¬¿ØÖÆ·½·¨ÏµÄÐü¼Ü¶¯ÔغɵıȽÏ49 6.3 ±¾ÕÂС½á53 µÚÆßÕ ½áÂÛ54 ²Î¿¼ÎÄÏ×56 ÖÂл57
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