挠性接管对管壁弯曲振动的隔离性能分析

采用分析软件ANSYS就理想情况下袖套式挠性接管在不同的边界条件和布置情况下，对管路中沿管壁传播的弯曲振动的隔离性能分析表明，挠性接管在大部分频段上能有效的隔离弯曲振动，但也有可能使振动放大，这与其边界条件和布置情况密切相关，由此对挠性接管的布置安装提出建议.     

柴油机电控系统的振动故障分析和改进设计

针对柴油机电控系统在随车使用中因振动而出现故障的问题,通过试验分析故障原因并提出了相应的解决措施;介绍了隔振方案的选择以及隔振器参数的确定,并对隔振效果进行了分析。     

聚氨酯隔振器试验建模与参数辨识

通过试验与理论相结合的方法,对聚氨酯隔振器进行动态特性研究,建立了隔振器的非线性弹性复合阻尼模型,该模型将恢复力分解为非线性弹性力和非线性阻尼力两部分,并用试验数据辨识出了模型中的参数.对比理论与试验结果表明:所建立模型能够很好地描述隔振器的非线性迟滞特性,为以后隔振系统动态特性研究奠定了良好基础.     

Introducing a new semi-active engine mount using force controlled variable stiffness

This work introduces a new concept in designing semi-active engine mounts. Engine mounts are under continuous development to provide better and more cost-effective engine vibration control. Passive engine mounts do not provide satisfactory solution. Available semi-active and active mounts provide better solutions but they are more complex and expensive. The variable stiffness engine mount (VSEM) is a semi-active engine mount with a simple ON–OFF control strategy. However, unlike available semi-active engine mounts that work based on damping change, the VSEM works based on the static stiffness change by using a new fast response force controlled variable spring. The VSEM is an improved version of the vibration mount introduced by the authors in their previous work. The results showed significant performance improvements over a passive rubber mount. The VSEM also provides better vibration control than a hydromount at idle speed. Low hysteresis and the ability to be modelled by a linear model in low-frequency are the advantages of the VSEM over the vibration isolator introduced earlier and available hydromounts. These specifications facilitate the use of VSEM in the automotive industry, however, further evaluation and developments are needed for this purpose.     

预应力混凝土大跨连续梁桥隔震设计

大跨预应力混凝土连续梁桥由于质量庞大,地震作用往往成为控制该类结构设计的主要因素.理论分析表明,处于地震高烈度地区桥梁的地震反应对结构参数变动十分敏感.加大构件截面或增加固定墩数量虽可提高结构的抗震能力,但同时也会使结构的地震反应迅速增加.反而使结构抗震能力需求缺口进一步扩大,因此按常规抗震设计思路进行抗震设计往往无法达到抗震设防目标.选用具有隔震和耗能双重功能的摩擦摆支座对桥梁进行减隔震设计,可大幅降低墩底内力,并使主梁相对于墩顶的位移控制在可接受范围内,满足结构的抗震需求.通过对摩擦摆支座滑动曲面半径和摩擦面滑动摩擦系数等参数的优化分析,得出了减隔震装置参数选取的基本原则.     

马脚隔振器底部螺栓紧固力矩对振动传递影响试验研究

为了解弹性马脚隔振器底部螺栓紧固力矩对系统振动传递特性的影响,选取某型船舶上典型管’路为研究对象,进行弹性马脚隔振器底部螺栓安装紧固力矩变化对系统振动传递影响的试验研究。结果表明,弹性马脚能够抑制管路振动向船体的传递,并具有比较明显的隔振效果。调整隔振器底部螺栓紧固力矩时,对弹性马脚隔振效果及船体结构振级影响不大。     

隔振器分布对浮筏隔振系统隔振性能的影响

目前,国内外对于浮筏隔振系统各个方面的研究都已很多,通常采用的是动力学建模及理论分析的方法。但此法通常是将隔振器简化为只有垂向刚度的弹簧和阻尼的单元,而忽略了隔振器的横向刚度及阻尼对系统的影响,简化模型与实际情况有一定差别,因此本文采用有限元法对浮筏隔振系统进行仿真分析。本文根据隔振器的选用及布置原则提出几种合理的布置方案,利用 ansys 有限元软件对提出的布置方案进行仿真,采用振级落差的隔振指标来评估浮筏隔振系统的隔振效果,为隔振器的布置方案设计提供一种思路。     

双波冲击机在减振器冲击试验中应用的可行性分析

简单介绍了冲击试验机的发展概况,重点讨论了双波冲击机的优越性及其在橡胶减振器等船舶设备冲击试验中应用的可行性。利用现有双波冲击机中正波和负波发生系统的数学模型,数值仿真了冲击机的输出波形特征。分析了双波冲击机的试验条件,计算了冲击机在空载工况下的冲击响应谱。仿真结果表明,双波冲击机的冲击响应谱在允许误差范围内,冲击机输出波形符合标准,可以用于冲击试验。     

基于有限元模型的橡胶减振元件性能研究及失效分析

介绍了橡胶减振器Mooney-Rivlin本构关系描述的橡胶材料的非线性弹性特性.通过有限元模型的建立,对减振器静态刚度特性和动态刚度特性进行了研究,得出了减振器刚度失效判据和硬度失效判据.     

Application Research of Genetic Algorithm on the Whole-Spacecraft Vibration Isolation System

The objective of the whole-spacecraft vibration isolation (WSVI) system is to reduce the launch-induced dynamic loads and the quality control cost of the satellite and its components, and to increase the launch reliability by insertion of isolators between the satellite and the launch vehicle. A niche hybrid genetic algorithm (NHGA) is proposed to optimize stiffness and damping of the isolators. Through the comparison of the frequency response analysis results, it shows that the optimized WSVI system more effectively reduces spacecraft axial / lateral response due to the broadband structure-born launch environment. At the same time, the case of the whole-spacecraft vibration isolation optimization design demonstrates the efficiency and validity of the genetic algorithm.