Optimization of Vibration Isolation Performance of Negative Stiffness Structure for the Grating Ruling Machine
The complex vibration factors existing in the large area Grating Ruling Machine laboratory will affect its operation and characterization accuracy.A passive vibration isolation structure with positive and negative stiffness parallel is designed for the Grating Ruling Machine to improve the phenomenon that only air spring is invalid for low-frequency vibration isolation and broaden the vibration isolation frequency band.In order to simulate the vibration isolation performance of the isolator,the dy-namic model and dynamic equation of the system are established.The simulation software MATLAB is used to simulate the size structure of the magnetic negative stiffness spring,and the vibration isolation effect before and after the parallel magnetic nega-tive stiffness spring is compared.The simulation results show that the air spring and the magnetic negative stiffness structure in par-allel can effectively isolate the low-frequency vibration,and the combination of magnetic suction negative stiffness and magnetic repulsion negative stiffness can effectively improve the nonlinearity of single magnetic suction negative stiffness or magnetic repul-sion negative stiffness structure.
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