轴向推力式机械振动台的振动测试仿真研究

发布时间：2018-04-09 00:12

本文选题：振动台　切入点：振动测试　出处：《华南理工大学》2014年硕士论文

【摘要】：振动台可以模拟产品在制造、组装运输及使用执行阶段中所遭遇的各种环境，用于鉴定产品是否能忍受环境振动的能力，对电子、机械、光电、航空等很多领域的研究、开发、制造都有着重要的作用。工作台作为振动台信号输出的末端，其振动特性能否达到人们所预期效果，将直接影响到产品振动试验的准确性。振动台自身整机的振动也会影响其设备的工作性能及寿命。本文针对一种自主研发的新型轴向推力式机械振动台，，提出了振动台几个重要振动参数的测试方法并利用虚拟样机对振动台进行柔性化仿真分析，重点进行了如下研究：（1）介绍了新型机械振动台的整体结构及工作原理，并提出了该振动台所需测试的振动参数：振动台整机振动（振动烈度）、工作台失真度、工作台横向振动比、工作台位移幅值均匀度、振动台激振力；（2）针对五个振动参数提出具体的测试方案，建立工作台的运动模型，根据各个振动参数的测试方案选择合适的振动传感器、电荷放大器、数据采集卡等硬件，并对各个传感器进行合理的安装布置；（3）利用虚拟仪器LabVIEW软件对五个振动参数进行测试软件系统的开发，用于对振动信号进行采集、分析处理及保存；（4）利用ANSYS Workbench软件对振动台整机和工作台进行模态分析，研究振动台的共振现象及共振频率；（5）利用虚拟样机软件ADAMS和有限元软件Hypermesh对振动台进行柔性运动仿真，研究振动台在不同工作频率下，振动台整机振动和工作台失真度的变化；研究振动台在同一工作频率下，不同位置振动烈度的大小。对振动台进行刚性体运动仿真，与柔性体运动仿真相比，研究整机振动对失真度的影响；利用ADAMS和LabVIEW对振动台进行联合仿真，研究振动台激振力的变化趋势；（6）基于机械振动台推力大、能承受重载荷的优点，提出振动台应用于飞机地面振动试验和运输振动模拟试验的方案。
[Abstract]:The shaking table can simulate the various environments encountered during the manufacture, assembly, transportation and use of the products, and can be used to assess the ability of the products to tolerate environmental vibration, and to research and develop many fields such as electronics, machinery, photoelectricity, aviation, and so on.Manufacturing plays an important role.As the end of the signal output of the shaking table, whether the vibration characteristic of the table can achieve the desired effect will directly affect the accuracy of the vibration test of the product.The vibration of the whole machine will also affect the working performance and service life of the equipment.In this paper, aiming at a new type of axial thrust mechanical vibration table developed by ourselves, the test method of several important vibration parameters of the vibration table is put forward, and the flexible simulation analysis of the shaking table is carried out by using virtual prototype. The emphasis of this paper is as follows:This paper introduces the whole structure and working principle of the new type mechanical shaking table, and puts forward the vibration parameters that need to be tested: the vibration intensity of the whole machine of the shaking table, the distortion of the worktable, and the lateral vibration ratio of the table.The displacement amplitude of the worktable is uniform, and the exciting force of the shaking table is obtained.(2) the specific test scheme for five vibration parameters is put forward, and the motion model of the worktable is established. According to the test scheme of each vibration parameter, the appropriate vibration sensor, charge amplifier, data acquisition card and other hardware are selected.And the reasonable installation arrangement of each sensor;The software system of testing five vibration parameters is developed by using LabVIEW software of virtual instrument, which is used to collect, analyze and save the vibration signal.(4) using ANSYS Workbench software, the vibration table and the whole machine are analyzed, and the resonance phenomenon and resonance frequency of the shaking table are studied.5) using the virtual prototype software ADAMS and the finite element software Hypermesh to simulate the flexible motion of the shaking table, to study the variation of the vibration and the distortion of the table at different working frequencies, and to study the vibration table at the same working frequency.The magnitude of vibration intensity at different locations.Compared with the flexible body motion simulation, the influence of the whole machine vibration on the distortion degree is studied, and the vibration table is simulated by ADAMS and LabVIEW to study the change trend of the exciting force of the shaking table.6) based on the advantages of large thrust and heavy load, the scheme of vibration table applied to aircraft ground vibration test and transportation vibration simulation test is put forward.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB534.2

【参考文献】