基于变形土壤地面对重型卡车平顺性的影响（英文）
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摘要
为了评价非公路可变形地面对重型卡车乘坐舒适性的影响,基于Matlab/Simulink软件建立了重型卡车与变形地面相互作用的非线性动力学模型.以加速度加权均方根(RMS)值和加速度功率谱密度(PSD)响应为目标函数,对不同工况下驾驶员座椅垂向低频振动、驾驶室的倾斜和俯仰低频晃动进行了仿真分析.研究结果表明,不同土壤地面变形对驾驶员乘坐舒适性均有明显影响.特别地,黏土地面对座椅的垂向振动影响较大,而干沙地面对驾驶室的晃动影响较大.此外,在低于4 Hz的低频内,车辆在较差土壤地面上的振动加速度PSD响应共振峰要多于ISO 2631-1标准C级公路路面.因此,低频范围内地面变形对驾驶员的健康有着重要影响.
In order to evaluate the impact of off-road terrains on the ride comfort of construction vehicles, a nonlinear dynamic model of the construction vehicles interacting with the terrain deformations is established based on Matlab/Simulink software. The weighted root mean square(RMS) acceleration responses and the power spectral density(PSD) acceleration responses of the driver's seat heave, the pitch and roll angle of the cab in the low-frequency region are chosen as objective functions under different operation conditions of the vehicle. The results show that the impact of off-road terrains on the driver's ride comfort and health is clear under various conditions of deformable terrains and range of vehicle velocities. In particular, the driver's ride comfort is greatly affected by a soil terrain while the comfortable shake of the driver is strongly affected by a sand terrain. In addition, when the vehicle travels on a poor soil terrain in the frequency range below 4 Hz, more resonance peaks of acceleration PSD responses occurred than that on a rigid road of ISO 2631-1 level C. Thus, the driver's health is significantly affected by the deformable terrain in a low-frequency range.
In order to evaluate the impact of off-road terrains on the ride comfort of construction vehicles, a nonlinear dynamic model of the construction vehicles interacting with the terrain deformations is established based on Matlab/Simulink software. The weighted root mean square(RMS) acceleration responses and the power spectral density(PSD) acceleration responses of the driver's seat heave, the pitch and roll angle of the cab in the low-frequency region are chosen as objective functions under different operation conditions of the vehicle. The results show that the impact of off-road terrains on the driver's ride comfort and health is clear under various conditions of deformable terrains and range of vehicle velocities. In particular, the driver's ride comfort is greatly affected by a soil terrain while the comfortable shake of the driver is strongly affected by a sand terrain. In addition, when the vehicle travels on a poor soil terrain in the frequency range below 4 Hz, more resonance peaks of acceleration PSD responses occurred than that on a rigid road of ISO 2631-1 level C. Thus, the driver's health is significantly affected by the deformable terrain in a low-frequency range.
引文
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[5] Li B H.3-D Dynamic modeling and simulation of a multi-degree of freedom 3-axle rigid truck with trailing arm bogie suspension[D].New South Wales,Australia:University of Wollongong,2006.
[6] Bekker M.Introduction to terrain-vehicle systems[M].Ann Arbor,USA:University of Michigan Press,1969.
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[11] Zhang X.Modelling,simulation and optimization of ride comfort for off-road articulated dump trucks[D].Nanjing,China:Southeast University,2010.
[12] Pakowski A,Cao D P.Effect of soil deformability on off-road vehicle ride dynamics[J].SAE International Journal of Commercial Vehicles,2013,6(2):362-371.DOI:10.4271/2013-01-2383.
[13] International Organization for Standardization.ISO/TC108/SC2/WG4 N57 Reporting vehicle road surface irregularities[S].Stuttgart,Germany:Thieme Medical Publishers,1982.
[14] International Organization for Standardization.ISO 8068 Mechanical vibration—Road surface profiles—Reporting of measured data[S].Geneve,Switzerland:International Organization for Standardization,1995.
[15] International Organization for Standardization.ISO 2631-1.Mechanical vibration and shock—Evaluation of human exposure to whole body vibration—Part 1:General requirements[S].Geneve,Switzerland:International Organization for Standardization,1997.