Determination of the transfer function of the pneumatic suspension of the seat on the hydraulic pulsator stand

The article presents the results of tests of the pneumatic suspension of the seat of the Sibeco company with a scissor guide mechanism on a single-point stand with a hydraulic drive manufactured by the Indian company BiSS. Pneumatic seat suspension is one of the most important components of the vibration protection system of the human operator of the vehicle. For researchers, engineers and designers involved in improving the level of comfort of new automotive equipment, it is very important to determine the dynamic characteristics of the systems of suspension of existing models of seats in order to further carry out constructive measures to improve their vibration protection properties. The most important dynamic characteristic that assesses the vibration-proof properties of the seat suspension is the transfer function. The purpose of the test is to determine the transfer function. The set includes metal elements connect the actuator of hydraulic pulsator stand and cargo, simulates the sprung mass, suspension seat, and a force sensor integrated into the stand design, and sensors accelerations fixed end to the upper frame and the base suspension. The studies were carried out on the modes of harmonic excitation of the considered system of suspension with a certain frequency. Time realizations of signals from acceleration sensors were recorded with an accuracy of 0,001 g, which were then processed to obtain RMS values and calculate the value of the transfer function. During the processing and analysis of the data obtained, the dependences of the transfer function of the seat air suspension on the frequency of the kinematic effects of the stand were built and the resonance frequency ranges were revealed. In conclusion, the nature of changes in the experimental transfer function of the seat suspension system with an increase in the frequency of disturbances is also determined.

vibration, acceleration, hydraulic pulsator stand, sensor, seat suspension, transfer function, pneumatic spring, shock absorber, experimental setup, frequency