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- Title
Hydraulic Fluid Temperature -Imposed Nonlinearities in Automotive Active Hydraulic Suspension Systems.
- Authors
Gazaz, Yousra A.; Soliman, M-Emad S.; Abdelrahim, Mahmoud; Abo El-Lail, Aly S.
- Abstract
In hydraulic active suspension systems, an oftenoverlooked source of nonlinearity is the performance deviation of the working hydraulic oil through the wide band of operating temperatures. In this paper, a quarter-car, Simulink® Simscape nonlinear hydraulic active suspension model has been constructed, taking ISO VG 22 oil as the working oil[1]. A PID controller has been tuned for the active suspension system. Targeted response parameters were tire deflection and suspension travel, as measures of vehicle handling, and sprung-mass acceleration as a measure of riding comfort. At a typical moderate vehicle speed of 40 km/hr, system response was investigated for both single sinusoidal bump and continuous wavy sinusoidal road inputs. Simulation was performed at two distant, extreme, operating temperatures, namely 60°C and -30°C. Results showed that at higher temperatures, the decrease in oil viscosity of the hydraulic actuator results in higher tire-rebound amplitudes and longer settling times, and a higher sprung mass acceleration amplitude, worsening both tire-road holding, and ride comfort compared to those at -30°C. The most significant conclusion is that an active suspension’s hydraulic actuator actually behaves as a nonlinear damper, besides being a force generator.
- Subjects
MOTOR vehicle springs &; suspension; PID controllers; ACCELERATION (Mechanics); HYDRAULIC fluids; TEMPERATURE; HIGH temperatures; ACTUATORS
- Publication
Journal of Engineering Sciences, 2024, Vol 52, Issue 3, p87
- ISSN
1687-0530
- Publication type
Article
- DOI
10.21608/JESAUN.2024.226034.1246