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Abstract
The vibration isolation effect of the pneumatic spring determines the precision of the manufacturing. In this paper, in order to detect the performance of a pneumatic spring, a multi frequency band testing system with different payload is designed and developed. First, the pneumatic spring structure is analyzed, and the stiffness of the pneumatic spring is obtained based on the ideal gas model, Kelvin–Voigt model, and finite element method. Then, to verify the reliability of the system, a dynamic model of the vibration platform is established. Through an analysis of the simulation using the Simulink environment, critical parameters are determined, and the effective conditions of the vibration isolation are obtained. Based on the results from the simulation and experiment, the transmission rate is around 20% under 40 Hz vibration, and 12% under 100 Hz vibration. The pneumatic spring proves to be effective under vibrations beyond 7 H. This achievement will become an important basis for future research concerning precision manufacturing.
Highlights
Vibration isolation technology is becoming increasingly important for precision manufacturing [1]
Compared with other spring mechanisms, pneumatic spring technology has the advantages of low natural frequency, variable stiffness rate, and high energy storage [2,3,4,5], and it is more suitable for vertical vibration isolation
Based on the dynamic model, the simulation of the testing system is established under Matlab/Simulink environment
Summary
Vibration isolation technology is becoming increasingly important for precision manufacturing [1]. Compared with other spring mechanisms, pneumatic spring technology has the advantages of low natural frequency, variable stiffness rate, and high energy storage [2,3,4,5], and it is more suitable for vertical vibration isolation. Pneumatic vibration isolators (PVIs) have been widely used in the automatic [6,7], precision instruments, and manufacturing fields [8,9]. Rubber Passive PVIs are developed with a simple structure and show good performance under high-frequency vibration. The passive isolation method with high-static-low-dynamic stiffness can overcome the dichotomy between low stiffness and load bearing capacity [10]. Rubber presents nonlinear and hysteresis characteristics in a dynamic response analyzed by Berg
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