Abstract
Improving ride comfort of earth-moving machinery is important to avoid potential health hazards for machine operator. A vehicle - road coupled interaction model including vehicle body, cab body and driver seat masses is set up under the random excitation of ground surface and a Fuzzy –PID controller is designed for control of the damping coefficient of a semi-active hydraulic cab isolation system (SHCIs) for an earth-moving machinery. The ride performance of SHCIs with a combined controller is evaluated under different movement conditions. The comparison results indicate that the proposed controller for semi-active cab hydraulic isolation system has the significantly improved vehicle ride comfort in compared with passive hydraulic cab isolation system (PHCIs) under large amplitude and low frequency excitations of ground surface.
Highlights
Earth-moving machinery usually operates in harsh working conditions such as off-road, noise and changing load conditions
A vehicle - road coupled interaction model of a wheel loader is set up under the random excitation of ground surface and a Fuzzy –PID controller is designed for control of the damping coefficient of (SHCIs)
The peak amplitude values of power spectral density (PSD) as with semi-active hydraulic cab isolation system (SHCIs) respectively reduce by 38.63 %, 28.09% and 73.69 % compared to passive hydraulic cab isolation system (PHCIs) at low frequencies as 3.40 Hz, 3.699 Hz and 6.099 Hz and the peak amplitude values of PSD acphi with SHCIs respectively reduce by 47.93 % and 82.34 % compared to PHCIs at low frequencies as 2.033 Hz and about 4.766 Hz
Summary
Earth-moving machinery usually operates in harsh working conditions such as off-road, noise and changing load conditions. In order to reduce the adverse effects caused by vibrations on the operator and vehicle durability, the researchers are constantly looking for ways to improve the design of the vehicle cab and driver seat suspension system. The dynamic models of the earth-moving machinery with 3 DOF were proposed to analyze vehicle ride comfort with or without vibration absorber system [5]. In order to improve vehicle ride comfort, the hydro-pneumatic suspension of earth-moving machinery was proposed to analyze the effects of it on the vehicle ride comfort, driving stability and operational stability based on a multibody model using RecurDyn in co-simulation with MATLAB/Simulink [8]. The hydraulic mounts were proposed to evaluate the effects of its characteristics on vehicle ride comfort based on a 6-DOF dynamic model of cab [13].
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