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悬架转向特性的汽车操纵稳定性分析 总被引:4,自引:0,他引:4
为进一步改善汽车直线行驶稳定性及转向行驶特性,近年来,人们对悬架系统的导向功能给予了更多的关注,具有转向功能的悬架系统相继得到发展。钢板弹簧县架系统“轴转向”效应的应用;前后轮转向主动控制的四轮转向(4WS)系统;以及使悬架系统具有合适的变形转向功能,其中,多链节(多连杆)悬架结构和雪铁龙ZX系列轿车的随动悬架便是代表。本文对这些结构各异的悬架系统的转向特性进行了对比分析,着重分析了雪铁龙ZX系列 相似文献
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汽车悬架系统为一多体系统,部件之间的运动关系十分复杂,传统的人工计算很难将悬架的各种特性表述清楚。以国产某轿车为例,应用多体运动学与动力学仿真软件ADAMS中的CAR专业模块建立该车的前后悬架多刚体模型,对其悬架的各种性能进行了仿真分析,研究了悬架几何参数对汽车操纵稳定性的影响,在理论验证的基础上揭示了该悬架的运动规律,在进行优化分析的同时还提出了改进的意见。 相似文献
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随着车辆控制技术的发展,电控空气悬架系统逐步取代了传统空气悬架.文章介绍了电控空气悬架系统的结构组成及其功能特点,概述了国内外电控空气悬架的发展情况,简要分析了其发展趋势.与传统弹簧悬架相比,电控空气悬架系统具有较优越的动态传递特性,能降低车轮与路面之间的相对动载,减少汽车对路面的冲击损坏,较好地改善汽车的行驶平顺性和操纵稳定性. 相似文献
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对富康轿车随动悬架结构中横向稳定杆的设计进行了分析,讨论了横向稳定杆结构对于富康轿车行驶稳定性的影响。 相似文献
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对现代汽车悬架振动特性进行研究,在对比几种典型的悬架控制系统的基础上,应用自动控制理论和微机技术风言风语地一种实用的汽车悬微机控制系统,使汽车在各种工况及路面条件下的闰顺性和安全性得以改善。 相似文献
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利用ADAMS软件对国内某前轮转向轿车的后悬架进行改造,建立具有主动悬架与四轮转向功能的整车虚拟样机模型。在考虑了悬架系统、转向系统和轮胎影响的情况下,进行了汽车在不平路面弯道性能试验,揭示了汽车在悬架和四轮转向综合控制下的动力学特性,为四轮转向车辆未来的研究提供了参考依据。 相似文献
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汽车悬架顺从性的初步研究 总被引:6,自引:2,他引:6
本文以滑柱摆臂式悬架为主要对象,利用计算机模拟及试验方法对汽车悬架的顺从性进行了初步研究。文内首先给出了悬架顺从性的定义和评价方法,接着介绍了悬架顺从性的计算程序和试验过程,然后分析了悬架结构形式和参数对顺从性的影响,最后对如何提高悬架的顺从性提出了建议。 相似文献
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弹性元件对奥迪轿车前悬架力学特性及顺从性的影响 总被引:3,自引:1,他引:3
本文分析了奥迪100轿车前悬架的结构特点,应用多体系统动力学理论和结构力学方法建立了设及导向构件和橡胶铰链弹性变形的悬架多体系统模型,并对其进行了计算分析。探讨了这两类变形元件对悬架力学特性和汽车顺从性的影响。 相似文献
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随动转向的分析与综合方法研究 总被引:1,自引:0,他引:1
基于侧偏柔度的随动转向研究,从四轮转向力反馈控制的角度对随动转向的稳定性和鲁棒性进行了研究,提出一种随动转向非线性弹性特性的综合方法。 相似文献
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采用以结构可靠性理论为基础的多系数极限状态设计方法已经成为国际结构工程界的大趋势,我国在结构可靠性理论研究和应用上已和国际标准接轨。比较了按结构可靠性理论进行设计与传统设计理论的不同特征。 相似文献
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二次空气阀在摩托车上的应用 总被引:1,自引:1,他引:0
本文阐述了二次空气阀的结构、工作原理和匹配要点.它的应用将使摩托车尾气中的有害成份CO和HC含量大大降低,从而满足欧Ⅱ排放法规要求. 相似文献
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制动—驱动工况下的轮胎侧偏特性理论研究 总被引:2,自引:0,他引:2
本文通过考虑制动和驱动工况下的轮胎印迹内垂直载荷分布的不同,建立了比以往模型更完善的制动-驱动工况下的轮胎侧偏特性理论模型,以6.50R16轮胎为例,分析了滑移率,侧偏角和垂直载荷分布形状参数等对其侧特性的影响。 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(4):257-278
Summary In this paper, the sensitivity analysis is applied to the development of high performance adaptive hydraulic mounts. The analysis allows us to select the most effective design parameters for tuning an adaptive mount to different road and engine conditions. It is shown that in the low frequency road excitation, the upper chamber compliance and inertia of the fluid column in the inertia track are the most influential properties in changing the dynamic stiffness of the hydraulic mount. These properties for the high frequency engine excitations are the upper compliance and the inertia of the fluid column of the decoupler. For tuning the adaptive mount to different road and engine excitation, a global optimization technique is used to find the magnitude of the adjusting parameters to minimize objective functions in low and high frequency excitations. The results indicate significant improvement over conventional hydraulic mounts. It is further shown that when the upper compliance is used as the adjusting parameter, a simple on-off control which is triggered by the engine revolution and vehicle speed is sufficient for tuning the adaptive mount. 相似文献
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M. S. Foumani A. Khajepour M. Durali 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2003,39(4):257-278
Summary In this paper, the sensitivity analysis is applied to the development of high performance adaptive hydraulic mounts. The analysis allows us to select the most effective design parameters for tuning an adaptive mount to different road and engine conditions. It is shown that in the low frequency road excitation, the upper chamber compliance and inertia of the fluid column in the inertia track are the most influential properties in changing the dynamic stiffness of the hydraulic mount. These properties for the high frequency engine excitations are the upper compliance and the inertia of the fluid column of the decoupler. For tuning the adaptive mount to different road and engine excitation, a global optimization technique is used to find the magnitude of the adjusting parameters to minimize objective functions in low and high frequency excitations. The results indicate significant improvement over conventional hydraulic mounts. It is further shown that when the upper compliance is used as the adjusting parameter, a simple on-off control which is triggered by the engine revolution and vehicle speed is sufficient for tuning the adaptive mount. 相似文献
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R. S. Sharp C. J. Alstead 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》1980,9(6):327-357
A new tyre model for studies of motorcycle lateral dynamics, and three new motorcycle models, each incorporating a different form of structural compliance, are developed. The tyre model is based on “taut string” ideas, and includes consideration of tread width and longitudinal tread rubber distortion and tread mass effects, and normal load variation. Parameter values appropriate to a typical motorcycle tyre are employed. The motorcycle models are for small lateral perturbations from straight running at constant speed, and include (a) lateral compliance of the front wheel in the front forks, (b) torsional compliance of the front forks, and (c) torsional compliance in the rear frame at the steering head about an axis perpendicular to the steering axis.
Results in the form of eigenvalues, indicating modal damping properties and natural frequencies are presented for each model. The properties of four large production machines for a range of forward speeds, and the practicable range of stiffnesses are calculated, and the implications are discussed.
It is concluded that typical levels of structural compliance in models (a) and (c) contribute significantly to the steering behaviour properties of large motorcycles, and their observed behaviour can be understood better in terms of the new results than of those existing previously. Some conclusions relating to optimal structural stiffness properties are also drawn. 相似文献
Results in the form of eigenvalues, indicating modal damping properties and natural frequencies are presented for each model. The properties of four large production machines for a range of forward speeds, and the practicable range of stiffnesses are calculated, and the implications are discussed.
It is concluded that typical levels of structural compliance in models (a) and (c) contribute significantly to the steering behaviour properties of large motorcycles, and their observed behaviour can be understood better in terms of the new results than of those existing previously. Some conclusions relating to optimal structural stiffness properties are also drawn. 相似文献