Design of an adjustable hydro-pneumatic damper for cab suspension

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Design of an adjustable hydro-pneumatic damper for cab suspension

Ruotsalainen, Pasi / Nevala, Kalervo / Marjanen, Ykä

The aim of this study was to design and test an adjustable hydropneumatic damper for cab suspension. The goal was to make a simple and cheap solution. Damping behavior for different terrain types had to be taken into consideration. The terrain types vary from field to road driving. In this study the semi-active damper has been carried out with a hydraulic direct acting cartridge type 2/2-way proportional flow control valve. The applicability of the valve to the semi-active damper was tested in a cab suspension test environment. The valve was tested with two natural and one artificial vibration stimulation tracks. With these results it was possible to ascertain the proportional valves' capability to work as a multi state damper. Flow-pressure curves and dynamic testing were carried out in the laboratory. The dynamic test with forced vibration was focused on stability in damping frequencies and the step response between different states. As a result, this research gave a lot of new information about proportional valves' applicability to work as a semi-active damper and information about damping behavior. Also, proportional valves' precise step responses and stability was investigated in a closed hydraulic system. The research showed that a proportional valve can work in cab suspension damper as well as a multi fixed orifice damper. Two-direction flow in the proportional valve was found to remain stable in cab suspension working conditions. The proportional valve has also capability to work as a continuous state damper which could lead to better damping results with the appropriate control system.