Semi-Active Adaptive Control System And Its Application For Vibration Control

Recently, with the progress of science and technology and improvement of people's living standard,more and more high vibration control performance is demanded. Active control system, due to its excellent control ability, has become a hotspot of research. .But there is no suitable damper,which has hindered the progress of active control.Electrorheological(ER) fluid is a kind of smart material. Because of its two attractive characteristic:controllabililty of its apparent viscosity and quick response to external applied electric field. ER fluid can be applied to mechanical vibration control,used as controllable medium,mainly in the form of controllable dampers.In this thesis, many research work has been done on ER adaptive vibration control system around the new idea that using vibration energy feedback to realize adaptive vibration control. On the basis of analyzing the mechanism and influence factors of ER fluid ,We developed a kind of ER fluid which is used in our experiment,then we made a performance test ,which proved that the ER fluid is better than before. The ER fluid we developed is quite suitable for research purpose, and it has a static yield stress of 3kPa at 3.3kV/mm.On the basis of analyzing the result of the test,we have improved the structure of the damper and revised the systematic model . We have experiments on the damper to test its damping performance.Comparing with the simulation force-displacement curves,we gave an explanation of why the factual force-displacement have aberrances,which gave warrants to the parameter design and structure's improvement. We found the state equation of the semi-active suspension on the semi-active adaptive control strategy and use computer simulations to compare the passive suspension structure and ER semi-active suspension.Computer simulations indicate that ER semi-active suspension have greatly improved driving smoothing and control stability.At the same time semi-active suspension is of simple structure and low cost.So in the long run,the semi-active suspensions may have wider application.