Abstract
In order to improve the dynamic performance of the grinding machine and improve the machining precision of the machine tool, a modal experiment is conducted on the complete machine and main sub-structures of the series-parallel hybrid grinding and polishing machine tool according to the basic theory of experimental modal analysis. Also, hammer impulse excitation and varied-time-based sampling methods are adopted to perform experimental modal analysis. Meanwhile, the eigensystem realization algorithm (ERA) is utilized to identify modal parameters, so that the low-order natural frequency, damping ratio and modal shape of the complete machine and its main substructures can be obtained. Based on the analysis of frequency and vibration mode, the beam is a weak link of the machine tool, while an approach to improve the dynamic characteristics of the machine tool structure is proposed to provide a basis for the optimized design of dynamics.
Highlights
The experimental modal analysis of the series-parallel hybrid machine tool uses the INV3018C signal acquisition analyzer, the INV9824 piezoelectric acceleration sensor, and the DASP
The selection process should follow principles such as no false mode generated, the measurement point being in a position that can reflect the geometric characteristics of the structure, the number of measurement points fully reflecting the modal vibration mode of various orders in the analysis range, the origin admittance position avoiding the node for preventing omitting modes and the uniform excitation direction and principal vibration direction
During the modal experiment of the column, the same principle as the modal experiment of the beam shall be followed, including no false mode generated and the measuring point that should reflect the location of geometrical characteristics of the structure
Summary
The experimental modal analysis of the series-parallel hybrid machine tool uses the INV3018C signal acquisition analyzer, the INV9824 piezoelectric acceleration sensor, and the DASP. V10 software (engineering version) to sample, calculate, and analyze the results of the machine tool[1,2]
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