In this paper , the mathematics model and simulation model of the passive landing gear shock absorber was built , and was verified by drop test . aimed at acquiring suitable efficiency diagrams , two simple semi - active control algorithms were designed . the mathematics model and simulation model of the semi - active landing gear shock absorber was built 在本文中，建立了被动控制起落架缓冲系统数学模型和仿真模型，并通过落震试验对该模型进行参数校验；以合适的功量图为控制目标设计出两种半主动简单控制律，建立了半主动控制起落架缓冲器数学模型和仿真模型；通过数字仿真对这两种控制方法进行了比较，认为半主动控制较被动控制有很大的优越性。
Comparing with passive control , active control is more complicated and it need large amount of energy , although its performance is better than other control me thods in theory . semi - active control is a new control method that its control rely on the structural responses or external disturbances , and its control devices can change working status to adapt the vary loads comparing with passive control . and it does not need the large amount of external energy supply 与被动控制相比，半主动控制的特点是能随结构动力反应或外界载荷的变化及时调整控制状态，使控制装置的减振作用更好地发挥出来，因而其控制效果更显著；与主动控制相比，半主动控制不需要外部巨大能源的保证，也不存在控制失稳问题，因而半主动控制已成为结构振动控制新的研究方向。
Hybrid control combined the passive control , active control and semi - active control is more effective and more reliable for improving safety of building under the earthquakes . in this paper , a detailed theoretical analysis and numerical simulation were carried out for a new kind of structural vibration control system base - isolation & active variable stiffness / damping ( bi & avsd ) 其中的混合控制选用被动控制、主动控制或半主动控制中的两种(或两种以上)控制技术相结合，吸收各种控制技术的优点，避免其缺点或存在的问题，使结构达到减震效果好，安全可靠，造价经济，现实可行等多重效果。
On the basis of some correlative research work and according to the characteristic of double - layer cylindrical lattice shell , a new semi - active control strategy of certain bottom chords replaced by special controllable dampers and a new passive control strategy of certain bottom chords replaced by various dampers are presented 本文在已有研究的基础上，根据双层柱面网壳的自身特点，提出了一种用可控杆件替换网壳中某些下弦杆的半主动控制策略。进一步又研究了用粘滞性阻尼杆代替网壳某些下弦杆的被动控制策略。
In addition , active constrained layer damping ( acld ) has attracted scholar ' s interests because it has the advantages of passive control and active control . the mechanism of vibration control of acld and the models of how to deal with the viscid - electric material are introduced . the finite element model of acld with ghm model is established in this paper 此外，主动层阻尼结构( acld )由于兼有被动控制和主动控制两者之优点也引起了国内外学者的兴趣，本文给出了主动层阻尼结构(约束层采用压电材料)抑振的工作机理，介绍了处理粘弹性层( vem )的几种模型，并采用ghm模型建立了主动层阻尼结构的有限元模型。
