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The multimode frequency analysis and its effect on the position accuracy of the sorting arm during operation

Inertial vibrations are one of the crucial problems in the chip sorting process. High acceleration excites the sorting machine structure up to high frequencies so that the multimode vibration appears. The multiple-input nature of operational excitation depends on the varying machine configurations and running accelerations. In this article, the strain gauges are used to study the dynamic behavior of a light-emitting diode chip sorting arm which runs in high speed with varying configurations. This analysis is done in three stages. In the first step, the structure dynamic characteristics are compared between the static and operation states. It points out that some high frequency may display different characteristics in the states. The second step aims to find the effects of different configurations on the sorting arm dynamic vibration during operation. In the last step, the sorting arm is sorted at different levels of running excitation, and the effects of the multimode vibration on chip accurate position are discussed. This study provides an approach to study the dynamic behavior of high-speed running structure within true boundary conditions and actual force and vibration levels.