O型钢丝绳隔振器特性研究

发布时间：2018-04-06 03:11

本文选题：O型钢丝绳隔振器　切入点：迟滞环　出处：《重庆大学》2015年博士论文

【摘要】：钢丝绳隔振器是一种典型的非线性隔振装置,具有良好的刚度和阻尼特性,承载能力较高,不老化,能够承受拉压、剪切和横滚三向载荷,广泛应用于工业、国防和航空航天等领域以及其他敏感设备的冲击和振动隔离。目前应用较为广泛的钢丝绳隔振器主要有螺旋型、拱型和球型等几种结构型式。然而,这些钢丝绳隔振器一旦成型,其弹性阻尼特性已基本确定,而且损坏后不易维修。针对其不足,本文在国家自然科学基金项目(项目编号:51175525)的资助下,提出一种O型钢丝绳隔振器,该隔振器采用多个彼此独立的钢丝绳环作为弹性阻尼元件,由上下夹板将钢丝绳环通过螺钉连接在一起。与传统钢丝绳隔振器比较,该隔振器能根据要求通过调整钢丝绳环个数来改变隔振器的弹性和阻尼特性,而且结构简单,装夹方便,维修容易,组装灵活。本文围绕这种O型钢丝绳隔振器开展研究,为设计和应用该隔振器奠定试验和理论基础。本文主要研究内容如下:1)设计制作一种O型钢丝绳环焊接工装,并提出了多步焊接工艺,成功制作出研究所需的多规格O型钢丝绳绳环。在确定了隔振器加载方式以及安装形式基础上,分别设计和加工隔振器剪切、横滚和拉压方向上的三向试验工装夹具。这些研究为测试O型钢丝绳隔振器特性试验的顺利进行以及确保采集试验数据的准确性奠定基础。2)提出了O型钢丝绳隔振器试验研究方案。获得了O型钢丝绳隔振器的结构参数(绳圈环数、钢丝绳直径、钢丝绳环直径和绳环的水平倾斜角度)以及激励振幅和频率对隔振器在剪切、横滚和拉压方向上动态迟滞阻尼特性的影响规律。为O型钢丝绳隔振器特性的后续研究提供了充分的试验数据。3)建立了一种改进的归一化Bouc-Wen理论分析模型,该模型在归一化Bouc-Wen模型基础上引进两个多项式修正因子。实现了O型钢丝绳隔振器剪切、横滚和拉压三向试验动态迟滞特性的建模。仿真和试验结果表明该模型能够准确的描述O型钢丝绳隔振器三向试验迟滞特性。4)提出了一种两步混合集成法对O型钢丝绳隔振器的理论分析模型参数进行识别研究,该参数识别方法含线性最小二乘法和极限环法。数值仿真和试验结果证实所采用的参数识别方法可以准确有效的识别出隔振器的所有模型参数。该方法不涉及迭代算法而且识别的模型迟滞曲线和试验迟滞曲线吻合较好。5)对含O型钢丝绳隔振器的单自由度非线性系统稳态响应进行了系统的研究。为了快速准确求解该系统的稳态响应,提出一种迭代谐波平衡半解析法分析含O型钢丝绳隔振器单自由度非线性系统稳态响应。该方法利用谐波平衡法形成一个非线性系统优化问题,采用非线性信赖域反射迭代算法对该非线性优化问题求解。仿真和试验结果表明:O型钢丝绳隔振器具有明显非线性特性和优异的隔振性能;在大多数情况下,数值积分法要经历几个周期或者几百个周期才达到稳态响应,而迭代谐波平衡半解析法能较快并准确地得到含O型钢丝绳隔振器单自由度非线性系统的幅频响应曲线,该方法理论分析推导量少,节省大量计算时间;迭代谐波平衡半解析法、Runge-Kutta法和试验测试所得含O型钢丝绳隔振器的单自由度非线性系统的稳态响应曲线吻合较好。
[Abstract]:The wire rope isolator vibration isolation device is a typical nonlinear, with good stiffness and damping characteristics, high bearing capacity, not aging, can bear tension and compression, shear and roll three to load, widely used in industry, national defense and aerospace and other sensitive equipment shock and vibration isolation at present the widely application of wire rope isolator are mainly spiral, arch and ball structure types. However, the wire rope isolator once formed, its elastic damping characteristics has been basically established, but the damage is not easy to repair. In view of the disadvantages, based on the National Natural Science Fund Project (project number: 51175525) supported by a O type wire rope isolator is proposed, the isolator using multiple independent wire rope ring as elastic damping element, the upper and lower splints wire rope ring through the screw is connected together with the transfer. The wire rope isolator, the isolator can according to the requirements by adjusting the rope ring number change elastic and damping characteristics of the isolator, and has the advantages of simple structure, convenient clamping, easy maintenance, flexible assembly. This paper focuses on the vibration of O type steel wire rope, for the design and application of the the isolator to provide theoretical and experimental basis. The main research contents of this paper are as follows: 1) design a kind of O type steel wire rope ring welding fixture, and puts forward the multi step welding technology, successfully developed multiple specifications of O wire rope required. In determining the isolator loading method and installation on the basis of the form, respectively, design and processing of vibration isolator shear, rolling and tension in the three direction to the test fixture. The test of O type wire rope isolator characteristics test smoothly and ensure the accuracy of test data collected.2) provided the foundation The O type wire rope isolator test research program. The structure parameters of O type steel wire rope isolator (the rope ring number, the diameter of wire rope, wire rope and rope ring ring diameter horizontal tilt angle) and excitation amplitude and frequency of vibration isolator in shear, influence of roll and pull the direction of pressure on dynamic hysteresis damping. Provide the test data.3 full follow-up study for the O type wire rope isolator characteristics) analysis model is established and an improved normalized Bouc-Wen theory, the model introduced two polynomial correction factor based on the normalized Bouc-Wen model. To achieve the O type wire rope isolator for modeling of shear, roll and tension compression three to test the dynamic hysteresis characteristics. Simulation and experimental results show that the model can accurately describe O type wire rope isolator to test three hysteresis.4) proposed a two step hybrid integration method of O type steel The theoretical analysis of the wire rope isolator model parameters identification research, the parameter identification method with linear least square method and the limit cycle method. Numerical simulation and experiment results prove that the parameter identification methods can accurately identify all the model parameters of vibration isolator. The method does not involve iterative algorithm and the recognition model of hysteresis test curve and hysteresis curve are in good agreement with the.5) to the nonlinear system state of single degree of freedom including O type wire rope isolator response was studied. In order to quickly and accurately solve the steady state response of the system, this paper presents an iterative semi analytical method of harmonic balance analysis with O type wire rope isolator with single degree of freedom nonlinear the steady-state response of the system. The method forms a nonlinear optimization problem by using the harmonic balance method, the nonlinear iterative algorithm of trust domain reflection of the nonlinear optimization problem is solved. The simulation and experimental results show that the O type wire rope isolator has obvious nonlinear characteristics and excellent isolation performance; in most cases, the numerical integration method to undergo several cycles or hundreds of cycles to reach a steady-state response, and iteration harmonic balance semi analytical method can rapidly and with O type wire rope isolator single degree of freedom nonlinear system accurately the amplitude frequency response curve, the method of theoretical analysis is less, save a lot of computation time; iteration harmonic balance semi analytical method, the steady state Runge-Kutta method and experimental O type nonlinear system of single degree of freedom wire rope vibration isolator response curves agree well.

【学位授予单位】：重庆大学
【学位级别】：博士
【学位授予年份】：2015
【分类号】：TB535.1

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