A Study on the Nonlinear Characteristics of Hydro-Pneumatic Suspension Systems for Mining Dump Trucks
Received: 28 November 2024 | Revised: 24 December 2024 | Accepted: 1 January 2025 | Online: 2 February 2025
Corresponding author: Nguyen Van Tuan
Abstract
In the current study, nonlinear characteristics of Hydro-Pneumatic Suspension (HPS) systems for mining dump trucks are proposed and analyzed for the ride comfort of off-highway vehicles. To analyze these characteristics, a mathematical HPS model was used to determine the vertical elastic and damping forces. Then, a two-degrees-of-freedom (2-DOF) quarter-vehicle dynamic model of a mining dump truck was proposed to analyze the nonlinear characteristics of the HPS systems implemented in a MATLAB/Simulink environment under low-frequency excitations of road surfaces. An experiment was set up to measure the vibration accelerations at the upper and lower positions of the HPS systems to verify the proposed HPS mathematical model. The experimental and simulation results demonstrated that both the time- and frequency-domain accelerations were consistent with the laws of physics and exhibited errors within acceptable ranges, thereby demonstrating the reliability of the proposed mathematical model. The simulation results showed that the elastic force increased rapidly during the compression process and increased slowly during the rebound process, whereas the damping force increased very slowly during the compression process but increased rapidly during the rebound process owing to the effect of the backflow valve. The results of the force characteristic curve analysis of the HPS systems with different excitation frequencies also revealed that when the vibration excitation frequency increased, the elastic, damping, and vertical total forces of the front and rear HPS systems increased quite rapidly.
Keywords:
mining dump truck, hydro-pneumatic suspension, elastic force, damping forceDownloads
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Copyright (c) 2025 Le Xuan Long, Le Van Quynh, Nguyen Van Tuan, Nguyen Minh Chau, Nguyen Khac Minh
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