There are three control methods of aircraft landing gear : passive control , active control and semi - active control 对起落架的控制方法经历了被动控制、主动控制和较新的半主动控制三个过程。
The principal content in this paper is the study for passive control systems of earthquake response of structure using sma damper 本文的主要内容是sma耗能器对建筑结构地震反应被动控制的研究。
Structural control can be classified as follows : active control , passive control , semi - active control and hybrid control 按照控制方式的不同，结构的振动控制可以分为主动控制、被动控制、半主动控制和混合控制四种。
Tuned mass dampers ( tmd ) and multiple tuned mass dampers ( mtmd ) are the most common and practical among these present passive control methods 在众多的被动控制方法中， tmd和mtmd是最为普遍的一种，也最具有实用价值和工程应用前景。
In general , the control methods of the aircraft ' s landing gear shock absorbers are classified three categories : a passive type , an active type , and semi - active type 一般地说，飞机起落架缓冲系统的控制方式有三种：被动控制、主动控制和半主动控制。
The mathematical mod els based on the assumed modes method and a dosed loop velocity feed back control law are developed to describe the fiexural vibration dynamic behaviors 引入速度负反馈形成闭环控制，对被动控制和主被动控制的控制效果进行了分析比较。
The mathematical models based on the assumed - modes method and a closed loop velocity feed - back control law are developed to describe the flexural vibration dynamic behaviors 引入速度负反馈形成闭环控制，对被动控制和主被动控制的控制效果进行了分析比较。
Then the performance of the active and passive control system is compared . the results show that active control system has superior performance over the passive control system 结果表明，添加主动控制器后，主动控制系统的性能与被动控制系统相比得到了明显的改善。
Meanwhile , the research also shows that a system with the active control combined with passive control is better than those systems with only active or passive control 同时，研究表明：主、被动控制技术相结合的控制系统的性能比只有主动控制或者只有被动控制的控制系统要好。
The semi - active control landing gear model was simulated trough the simulation soft matlab and the simulation results were in contrast with the results of passive control model 以matlab软件为平台对半主动控制下的起落架着陆过程进行仿真,并与被动控制下的仿真结果作了分析对比。
