负刚度减振设备的开发及其在结构抗震中的应用

发布时间：2018-07-10 19:26

本文选题：负刚度 + 被动隔振　；参考：《苏州科技大学》2017年硕士论文

【摘要】：通过对正负刚度并联隔振器隔振机理分析,设计了一种基于负刚度理论的被动减振装置。通过设计参数优化,建立了系统的刚度函数表达式及平衡位置处的零刚度条件,进而细化设计出隔振装置。为验证该设施的隔振效果,将其应用在框架模型和桥梁模型的抗震中,证明了该设备能够通过纯粹的机械机制产生负刚度,达到结构减震效果。文中所设计负刚度装置(NSD)是通过一个大的弹簧,使结构远离中心位置,从而产生负刚度的力学行为。利用数值计算方法分析负刚度结构系统的内部特性,研究了影响负刚度隔振设备设计影响因数,并且通过蒙特卡罗响应面结合全概率方法分析其敏感性。最后通过实验验证了本文设计的隔振器降频和隔振的效果和抗冲击性能。本文主要研究工作分为以下几个方面:论文首先阐述了研究背景和意义,简单介绍了结构振动控制的概念、分类。总结了国内外现有振动控制的研究状况和理论背景。最后介绍了负刚度隔振器的研究背景及意义,进而引出本课题的研究动机。其次通过对负刚度隔振器各参数之间的优化寻找他们之间的关系,并采用数值计算验证了文中所设计负刚度隔振器具有降频和隔振的效果。接着采用蒙特卡罗响应面结合全概率方法分析了影响负刚度隔振设备影响因数的灵敏度。并通过实验验证了隔振器降频和隔振的效果。最后总结了课题的研究结论,并对进一步研究给出一些建议。
[Abstract]:Based on the analysis of the vibration isolation mechanism of the parallel vibration isolator with positive and negative stiffness, a passive vibration absorber based on the theory of negative stiffness is designed. By optimizing the design parameters, the expression of the stiffness function and the zero stiffness condition at the equilibrium position are established, and then the vibration isolation device is designed. In order to verify the vibration isolation effect of the equipment, it is applied to the seismic resistance of the frame model and the bridge model. It is proved that the equipment can produce negative stiffness through pure mechanical mechanism and achieve the effect of structural vibration absorption. The negative stiffness device (NSD) is designed to make the structure far away from the center of the structure through a large spring, which results in the mechanical behavior of negative stiffness. The internal characteristics of the negative stiffness structural system are analyzed by numerical method. The influence factor of the design of the negative stiffness vibration isolator is studied. The sensitivity of the system is analyzed by the Monte Carlo response surface combined with the full probability method. Finally, the effect and impact resistance of the vibration isolator designed in this paper are verified by experiments. The main research work of this paper is as follows: firstly, the background and significance of the research are described, and the concept and classification of structural vibration control are briefly introduced. The research status and theoretical background of vibration control at home and abroad are summarized. Finally, the research background and significance of negative stiffness isolator are introduced. Secondly, by optimizing the parameters of the negative stiffness isolator, the relationship between them is found, and the numerical calculation is used to verify that the negative stiffness isolator designed in this paper has the effect of reducing frequency and isolating vibration. Then the sensitivity of the influence factor of the negative stiffness isolation equipment is analyzed by using the Monte Carlo response surface and the full probability method. The effect of frequency reduction and vibration isolation is verified by experiments. Finally, the conclusion of the research is summarized, and some suggestions for further research are given.
【学位授予单位】：苏州科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU352.1

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