LED芯片分选机摆臂结构运行振动的实验研究

发布时间：2018-03-05 21:10

本文选题：模态分析　切入点：高频往复运动　出处：《华中科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：芯片行业朝着高速、高精、高效的方向发展,但是还存在很多问题,振动是高精度加工的关键问题之一。急需要一种高效、高精、高速的芯片分拣设备,摆臂作为分选设备的核心部件,摆臂快速急停以及转动,会引起较大的惯性振动,将直接影响芯片的拾取精度。所以提高工作效率主要的因素就是控制摆臂的振动。而振动抑制方法前提是必须能够获得动力学特性,所以研究摆臂的动态特性尤为重要。本文先对目前高频往复机构存在的问题进行了分析,针对LED芯片分选机的摆臂进行了传统的实验模态分析,指出传统的实验模态分析法对于大型结构测试是有效的,但是对于轻质结构来说存在不足,在运行状态下也无法识别模态参数。结构应变响应的分析方法解决了输入不可测的问题,也解决了因为传感器自身的质量造成实验数据不准确。对类似摆臂结构悬臂梁进行了应变响应测试、实验模态分析和有限元仿真分析,实验结果表明应变响应测试方法能准确获取结构模态参数,验证了应变响应测试方法的准确性。为了获得摆臂的动态特性,做了两件事情。第一,对摆臂静止和运行状态两个状态进行应变响应测试;第二,对摆臂处于不同工作位置下进行应变响应测试。同时对摆臂运行频谱图中高低频段响应规律进行分析,指出摆臂振动是由多阶频率共同引起的,在分析时必须关注结构高频的影响,为运行过程摆臂振动抑制提供指导。通过上述的研究,本文从多个方面对芯片分选机摆臂结构进行动力学分析,探究一种方法更准确的获取摆臂结构运行振动的动态特性。
[Abstract]:The chip industry is developing in the direction of high speed, high precision and high efficiency, but there are still many problems. Vibration is one of the key problems in high precision machining. As the core component of the sorting equipment, the swing arm can cause a large inertial vibration if it stops and rotates quickly. Therefore, the main factor to improve the working efficiency is to control the vibration of the pendulum arm. The method of vibration suppression must be able to obtain the dynamic characteristics. Therefore, it is very important to study the dynamic characteristics of the swing arm. Firstly, the problems of the high frequency reciprocating mechanism are analyzed, and the traditional experimental modal analysis is carried out for the swing arm of the LED chip separator. It is pointed out that the traditional experimental modal analysis method is effective for the test of large structures, but it is insufficient for lightweight structures. The modal parameters can not be identified in the running state. The analysis method of structural strain response solves the problem that the input is undetectable. The imaccuracy of experimental data caused by the mass of the sensor itself is also solved. The strain response test, experimental modal analysis and finite element simulation analysis of cantilever beam with similar swinging arm structure are carried out. The experimental results show that the strain response test method can accurately obtain the modal parameters of the structure, and verify the accuracy of the strain response test method. In order to obtain the dynamic characteristics of the pendulum arm, two things have been done. The strain response of the pendulum arm in static and running states is tested. Secondly, the strain response of the pendulum arm in different working positions is tested. The response law of high and low frequency band in the swing arm operation spectrum is analyzed. It is pointed out that the vibration of the pendulum arm is caused by multiple frequencies, and the influence of the high frequency of the structure must be paid attention to in order to provide guidance for the vibration suppression of the swinging arm in the course of operation. In this paper, the dynamic analysis of the swing arm structure of the chip separator is carried out from many aspects, and a more accurate method to obtain the dynamic characteristics of the swing arm structure is explored.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN312.8

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