复合隔减振装置力学性能及受控结构分析

发布时间：2018-06-13 22:33

本文选题：复合隔减振装置 + 性能试验　；参考：《东南大学》2015年硕士论文

【摘要】：载荷平台结构是专属仪器设备的工作载体,其承载力因其特殊用途会达到较大数量级。由于所处的工作环境十分复杂,振源激励具有很宽的频率范围(0～500Hz),载荷平台的振动不仅十分复杂,而且伴随着多个方向的同时振动,这些不利因素将导致仪器设备精度降低和使用寿命缩短。因此,载荷平台结构的隔减振要求突出体现在高性能、宽频率范围以及高稳定性。如何使载荷平台满足隔减振要求,是对现有隔减振装置的性能、高耗能材料应用及结构设计方案的严峻考验,在这些方面存在着许多问题有待进一步解决和完善。本文以用于载荷平台结构的新型隔减振装置为研究对象,结合国内外的最新研究进展,开展了以下几个方面的研究：研究分析了复合隔减振装置的力学性能；建立了复合隔减振装置的力学模型；分析了加入复合隔减振装置平台结构的动力响应。以下为本文的主要研究内容及有关结论：(1)针对载荷平台结构的工作环境及受力特点,引入了一种新型复合隔减振装置。该装置融合了高耗能粘弹性技术、粘滞流体技术和空气弹簧技术,不仅具有良好的竖向隔减振性能,而且连接性能好、稳定性高,适用于载荷平台的隔减振。(2)对复合隔减振装置进行了竖向性能试验,并对数据进行分析。试验分析表明：加载频率、位移幅值均复合隔减振装置的各项性能参数有着一定影响；复合隔减振装置的动态性能参数,如储能模量G1、损耗模量G2和损耗因子η,均随着频率的增大而增大,随着位移幅值的增大而减小；每圈耗能Ed随着频率与位移幅值的增大而增大。(3)从动力学平衡方程入手,提出了复合隔减振装置的力学模型,该力学模型能够同时考虑粘弹性材料贡献力、粘滞流体(硅油)贡献力和空气弹簧贡献力,并将该力学模型的计算值与试验结果进行了分析对比。对比分析结果表明：建立的复合隔减振装置的力学模型能够与试验结果吻合较好,具备较高的精度,能够为工程应用提供理论基础。(4)基于本文所提出的复合隔减振装置力学模型,并结合实际平台结构,对加入复合隔减振装置的平台结构进行了动力学建模,并在MATLAB环境下对平台结构进行了不同激励作用下的动力反应分析,得到时程响应。分析结果表明：加入复合隔减振装置的平台结构的动位移符合限值要求,加速度时程显著降低。
[Abstract]:The load platform structure is the working carrier of the special instrument and equipment, and its bearing capacity will reach the order of magnitude because of its special use. Since the working environment is very complex and the vibration source excitation has a wide frequency range of 500 Hz, the vibration of the loading platform is not only very complex, but also accompanied by simultaneous vibration in many directions. These unfavorable factors will lead to the reduction of the precision and the shortening of the service life of the instrument and equipment. Therefore, the vibration isolation and damping requirements of load platform structure are high performance, wide frequency range and high stability. How to make the load platform meet the requirements of vibration isolation is a severe test for the performance of the existing vibration isolator, the application of high energy dissipation materials and the structural design scheme. There are many problems to be solved and improved in these aspects. In this paper, a new type of vibration isolating device for load platform structure is taken as the research object. Combined with the latest research progress at home and abroad, the following aspects are studied: the mechanical properties of the composite vibration isolating device are studied and analyzed; The mechanical model of the composite vibration isolating device is established and the dynamic response of the platform structure with the composite isolating device is analyzed. The following is the main research content of this paper and related conclusions: (1) according to the working environment and mechanical characteristics of the load platform structure, a new type of composite vibration isolating device is introduced. The device combines high energy dissipation viscoelasticity technology, viscous fluid technology and air spring technology. It not only has good vertical isolation and vibration absorption performance, but also has good connection performance and high stability. The vertical performance test of the composite vibration isolating device is carried out and the data are analyzed. The experimental results show that the loading frequency and displacement amplitude have certain influence on the performance parameters of the composite vibration isolating device, and the dynamic performance parameters of the composite vibration isolating device, For example, the storage modulus G 1, loss modulus G 2 and loss factor 畏 increase with the increase of frequency and decrease with the increase of displacement amplitude. A mechanical model of composite vibration isolator is presented. The model can take into account the contribution of viscoelastic material, viscous fluid (silicone oil) and air spring simultaneously. The calculated values of the model are compared with the experimental results. The results of comparison and analysis show that the mechanical model of the composite vibration isolator is in good agreement with the experimental results and has a high accuracy. It can provide the theoretical basis for engineering application. (4) based on the mechanical model of the composite vibration isolator proposed in this paper, and combining with the actual platform structure, the dynamic model of the platform structure with the composite vibration isolator is established. The dynamic response of the platform structure under different excitations is analyzed in MATLAB, and the time-history response is obtained. The results show that the dynamic displacement of the platform structure with the composite vibration isolator meets the limit requirement and the acceleration time history is significantly reduced.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU352.1

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