Research and development of seat suspensions for working machines

The paper contains physical and mathematical model of passive and active control of working machine's seat suspension. Seat with a viscous-elastic passive suspension, which vibro-isolation properties became improved by modification of the air-spring and shock absorber forces and also by active control are the objects of simulation. As the results of computer simulation, power spectral density of acceleration for a seat have been presented in comparison with sample excitation on the working machine's cabin floor. Transmissibility functions for a passive suspension and corresponding active suspension also have been presented.