Abstract
Under high-frequency reciprocating operation, the dynamics of the sorting arm are different between operating status and standstill status. First of all, the energy of inertial impact and frequency band depend on the actual motion state, which are closely related to the dynamics of the arm structure. Secondly, during the high-frequency reciprocating operation, the positions of sorting arm change, which causes its configurations changes. At the same time, the acceleration and deceleration in each stage of operation are also inconsistent. These factors make the vibration of the sorting arm structure more complicated. Therefore, the dynamics of the sorting arm mechanism must be analyzed under the actual operating conditions. The paper takes the sorting arm of LED chip sorter as the research object, and it is pointed out that the sorting arm structure has the characteristics of multi-mode high-low frequency during operation. However, the structural configurations and operating parameters of the sorting arm are the main influencing factors of its vibration, which have different characteristics of the high-low frequency response. In this paper, the use of sequential sub-section design to determine the configurations and the corresponding time-series during the operation. Through the analysis of multi-mode frequency response of the sorting arm, the characteristics of high-low frequency range corresponding to the two kind of work excitation are obtained. This paper verifies that the dynamics of the sorting arm are affected by the excitation of structural configurations and the excitation of operating speed during high-speed operation. The laws of high-low frequency response of the sorting arm under different operation parameters and configurations are found out, which provides guidance for the vibration suppression of the sorting arm under operation.
Highlights
At present, in order to obtain the dynamics of the mechanism vibration system, the analysis method of the dynamic characteristics of the operational structure has not been calculated with the required accuracy in the model
The method has the following characteristics: (1) the modal parameters of the structure under non-working conditions will not change with time; (2) the excitation force and response of the structure are measured by artificial excitation; (3) the modal parameters are identified by the frequency response function to analyze the structural dynamics [2, 3]
This paper provides guidance for the vibration suppression of the sorting arm under operation
Summary
In order to obtain the dynamics of the mechanism vibration system, the analysis method of the dynamic characteristics of the operational structure has not been calculated with the required accuracy in the model. The method has the following characteristics: (1) the modal parameters of the structure under non-working conditions will not change with time; (2) the excitation force and response of the structure are measured by artificial excitation; (3) the modal parameters are identified by the frequency response function to analyze the structural dynamics [2, 3]. Symens W believes that the interaction between structural components under high-frequency operation leads to flexible characteristics and time-varying boundary conditions, resulting in the modal parameters being quite different from those under static conditions [9]. Spiridonakos MD studies the supported beam with movable mass, and obtains the dynamics of time-varying steel beam with mass block at different speeds by analyzing the vibration response [10].
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