Modeling and control of air spring vibration absorbers with switchable natural frequencies using multiple auxiliary chambers

Abstract

This paper investigates the use of multiple auxiliary chambers to achieve air spring vibration absorbers with switchable natural frequencies. Using a triple-auxiliary-chamber (TAC) air spring as an example, the characteristics of passive and active TAC air springs are studied independently, with the active TAC air spring ultimately being applied to the semi-active absorber. The implementation of a PI controller effectively suppresses inherent disturbances in active environments, such as the periodic start-stop cycles of the air compressor, ensuring the stability of the air spring piston's static equilibrium position. An Fast Fourier Transform (FFT) algorithm is employed to detect the excitation frequency, with bandwidth correction enhancing sensor performance and improving frequency estimation accuracy. By sensing the excitation frequency and applying a rule-based vibration control strategy via the "composite frequency response curve" method, the number of auxiliary chambers in operation is adjusted in real time. This enables stepwise adjustment of the air spring's natural frequency, ultimately eliminating resonance in the controlled object within the 1–10 Hz range.