超声变幅杆及其性能参数测试平台设计-本科毕业论文

本科毕业论文

(2015届)

题目超声变幅杆及其性能参数测试平台设计学院机械工程学院

专业机械设计制造及其自动化

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指导教师

完成日期2015年5月

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我谨在此承诺：本人所写的毕业论文《超声变幅杆及其性能参数测试平台设计》均系本人独立完成，没有抄袭行为，凡涉及其他作者的观点和材料，均作了注释，若有不实，后果由本人承担。

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摘要

本文从已知的变幅杆大小端直径、工作频率和材料出发，对超声加工系统中的变幅杆进行了研究。本文主要包括以下研究内容：

1.根据已有的变幅杆大小端直径，通过波动方程理论，完成对阶梯型、指数形、圆锥形三种变幅杆的外形设计计算。

2.利用有限元方法，借助有限元软件ANSYS对设计出的三种变幅杆进行动力学分析。先在SolidWorks中建立三种变幅杆的三维模型，再导入ANSYS中进行模态分析和谐响应分析。模态分析是指在规定超声波发生器所产生的振动的频率范围内，测定出变幅杆的各个固有频率。谐响应分析是指确定变幅杆的一个固有频率，并在变幅杆的一个固定断面施加一个正弦规律的振动，再测定变幅杆的自由端的振动变化。通过比较自由端和固定端的振幅大小变化，求出所设计的变幅杆的振幅放大比。

3.搭建实验测定平台。搭建了单独测定变幅杆放大系数的实验平台，还搭建了测定超声振动系统性能的实验平台，并对已有的变幅杆加以实验测定。通过阻抗分析仪、激光位移传感器等得到谐振频率、放大系数的实际测量数据，并判定了已有的超声振动系统的性能。

关键词：超声变幅杆；有限元；模态分析；谐响应分析；实验平台

ABSTRACT

Starting from the known diameters of both ends of ultrasonic horn, the working frequency and the material, the horn with the ultrasonic processing system were studied. This paper mainly includes the following contents:

1.According to the diameters of both ends of ultrasonic, and by the theory of wave equation, complete the size calculation of tapered, exponential and stepped ultrasonic horn.

ing the finite element method, complete the dynamics analysis of three horn by the finite element software ANSYS. First, we should set up 3D models of three horn in SolidWorks, and then import 3D models to ANSYS for modal analysis and harmonic response analysis. Modal analysis is in accordance with the ultrasonic generator vibration frequency range and determine each natural frequency of the horn. Harmonic response analysis is in the determined natural frequency of a horn, and the horn of a fixed section applied a sinusoidal vibration, to determine the vibration change of the free end of the horn. By comparing the amplitude change of the free end and the fixed to get the amplification ratio of the designed horn.

3.Set up the experimental test platform.The experimental platform of measuring the amplification coefficient of variable amplitude rod is established, and then the experimental platform of measuring the ultrasonic vibration system performance is established, and the existing variable amplitude rod was measured experimentally. The actual measurement data of the resonant frequency and the amplification coefficient are obtained by the impedance analyzer and laser displacement sensor, and the performance of the ultrasonic vibration system is determined.

Keywords: ultrasonic horn；finite element；modal analysis；harmonic response analysis；experimental platform