轴向推力式机械振动台的设计及模拟仿真

发布时间：2018-03-03 19:52

本文选题：机械振动台　切入点：包络理论　出处：《华南理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：振动台是一种用于检验各类工业产品和工程建筑力学性能的标准试验设备。本文在分析国内外现有各类振动台特性及其发展现状的基础上，通过采用新型激振方式和特殊的结构，设计了一种负载能力大，上限频率高，，加速度波形失真度小的新型轴向推力式机械振动台，并进行深入理论研究以及计算机仿真分析，为振动行业的发展提供新方法、新技术和新设备。本文首先根据轴向推力式机械振动台的激振原理，应用包络面理论导出了激振台工作曲面方程，使其输出曲线符合余弦加速度运动规律。并据此研究了激振台工作曲面与滚子的接触线形态特点，同时导出了曲面的曲率半径和机构压力角公式，为振动台的详细设计以及力学分析奠定基础。其次，从刚体动力学及弹性动力学两方面对该振动台进行了分析。通过建立系统的动力学微分方程，分别讨论了其力矩输出特性和台面稳定运行的临界条件，并进行了仿真验证。同时分析了该振动台产生的位移、速度和加速度谐波误差的原因，并根据激振台残余振动的函数曲线，得出了主轴转速限制条件。利用赫兹理论校核了接触部件的强度；分析了滚子和激振台工作曲面之间的相对滑动及运行中的功率损耗。最后，在建立该振动台的虚拟样机模型的基础上，验证和分析了输出波形的特点。从随机波误差和谐波误差两方面分析了其加速度的波形，并用DFT频谱分析方法编程计算其失真度大小。同时基于UG/Motion和Matlab/Simulink联合仿真技术，建立了振动台的动力学模型和控制系统，并进行了联合仿真分析，验证了该控制系统的有效性和合理性，为该新型振动台的优化研究奠定了基础。
[Abstract]:Vibration table is a kind of standard test equipment used to test the mechanical properties of various industrial products and engineering buildings. This paper analyzes the characteristics and development status of all kinds of shaking table at home and abroad. A new type of axial thrust mechanical vibration table with high load capacity, high upper limit frequency and low distortion of acceleration waveform is designed by adopting a new type of exciting mode and special structure, and further theoretical research and computer simulation analysis are carried out. To provide new methods, new technology and new equipment for the development of vibration industry. In this paper, first of all, according to the exciting principle of the axial thrust mechanical vibration table, the equation of the working surface of the exciting table is derived by using the envelope theory. The output curve accords with the law of cosine acceleration. Based on this, the shape characteristics of contact line between the working surface of the exciting table and the roller are studied, and the curvature radius of the surface and the pressure angle formula of the mechanism are derived. It lays a foundation for the detailed design and mechanical analysis of vibration table. Secondly, the vibration table is analyzed from two aspects: rigid body dynamics and elastic dynamics. By establishing the dynamic differential equation of the system, the torque output characteristics and the critical conditions for the stable operation of the table are discussed respectively. At the same time, the causes of the harmonic errors of displacement, velocity and acceleration are analyzed, and according to the function curve of the residual vibration of the vibration table, The limiting conditions of spindle speed are obtained. The strength of contact parts is checked by using Hertz theory. The relative sliding between roller and exciting table and the power loss in operation are analyzed. Finally, on the basis of establishing the virtual prototype model of the shaking table, the characteristics of the output waveform are verified and analyzed. The acceleration waveform is analyzed from the random wave error and harmonic error. The DFT spectrum analysis method is used to program and calculate the distortion degree. Based on the joint simulation technology of UG/Motion and Matlab/Simulink, the dynamic model and control system of the shaking table are established, and the joint simulation analysis is carried out. The validity and rationality of the control system are verified, which lays a foundation for the optimization research of the new vibration table.
【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

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