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采用非线性轮胎模型,在此基础上建立了两轴汽车操纵稳定性数学模型。并对用Simulink构建的计算机模型进行仿真,通过实例详细描述了在Matlable环境下的车辆操纵稳定性仿真研究的实现过程,分析了横摆角速度和质心侧偏角对汽车操纵稳定性的影响。仿真结果可为实际设计车辆动力学稳定性控制系统提供理论依据。 相似文献
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《农业装备与车辆工程》2015,(3)
建立基于ADAMS/Car的整车仿真模型,根据《GB/T6323-1994汽车操纵稳定性试验方法》,对模型进行操纵稳定性仿真分析,对实际车辆进行操纵稳定性道路试验。分析各项试验指标的仿真结果并进行评分。比较仿真分析结果和道路试验结果,误差为3.4%。在该模型的基础上对质心高度、整车质量、轮胎侧偏刚度进行优化。结果表明,减轻整车质量、降低质心高度均可提高大客车的操纵稳定性。 相似文献
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对转向时车辆质心侧偏角近似等于零为控制目标的四轮转向车辆操纵稳定性进行仿真分析。在建立四轮转向车辆操纵动力学模型,得到其状态方程的基础上,求解出横摆角速度和侧向加速度与前轮转角的传递函数,借助Matlab/Simulink,进行时域和频域的仿真,并将仿真结果与传统前轮转向车辆做比较,结果表明四轮转向车辆大大提高了车辆的操纵稳定性。 相似文献
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刘静 《拖拉机与农用运输车》2015,(2):31-34
首先建立了四分之一车辆悬架系统的数学模型,应用MATLAB/Simulink软件建立该系统的仿真模型,并对此系统在白噪声、坡、台阶3种不同路面输入下车身加速度、轮胎动载荷和悬架动行程的仿真结果进行比较分析,得出了过特殊路面车辆操纵稳定性和乘坐舒适性下降的趋势。最后分别仿真研究了悬架单个参数和两个参数综合对悬架各性能指标的影响,为悬架系统参数的优化设计提供了一种有效的参考方法。 相似文献
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为了对整车操纵稳定性进行评价和预测,在以多刚体理论为基础的ADAMS软件中建立整车多体动力学仿真模型。整车仿真模型包括:前悬架,后悬架,转向系,前后轮模型以及发动机模型。通过设置控制文件对整车进行操纵稳定性的仿真,并与样车的操纵稳定性试验对比,且二者吻合,说明建立了正确的虚拟样机模型,并对仿真结果进行计分评价,有效地分析了样车的操纵稳定性,为进一步改进实车的操纵稳定性提供了有力的依据。 相似文献
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汽车操纵稳定性的仿真分析与影响因素研究 总被引:2,自引:2,他引:0
以某型汽车为研究对象,分析其动力学特性,建立整车动力学模型,并在Matlab/Simulink中搭建动力学仿真模型,研究轮胎侧偏刚度、质心位置、汽车绕z轴转动惯量、汽车侧倾转向度、汽车侧倾阻力系数、汽车侧倾刚度等参数对汽车操纵稳定性的影响。结果表明,这些参数对汽车操纵稳定性有不同程度的影响,研究结果能够为汽车参数设计提供理论依据。 相似文献
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扭杆弹簧悬架是影响车辆操纵稳定性和行驶平顺性的关键部件之一。以某轻型车辆扭杆弹簧悬架为研究对象,利用ADAMS软件建立了刚柔耦合悬架模型,通过悬架随车轮上下跳动进行仿真,对其定位参数的变化范围进行对比,分析了单级和两级扭杆弹簧悬架运动学特性。结果表明,采用两级扭杆弹簧悬架设计可以提高操纵稳定性和行驶平顺性,为悬架设计提供了参考依据。 相似文献
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《Journal of Agricultural Engineering Research》1998,69(3):249-254
A model to represent the discolouration of dried powder of carrots as a function of temperature was developed. Two types of carrots, Asian and European, containing large amount of lycopene and β-carotene, respectively, were tested. The dried powder was stored under an atmosphere with O2and at three different temperatures, 5,20 and 35°C. The surface colour of the powder was monitored during storage by a Hunter colour ratioa/b. In the proposed model, the rate of oxidation was assumed to be represented by the product of the fraction of concentration of oxidized pigment at arbitrary time and a specific rate of oxidation of pigment. The rate parameters in the proposed model were calculated by fitting the experimental data with smooth curves by trial and error at the end of the induction period but before discolouration took place. The frequency constant and activation energy, expressing the temperature dependence of the rate parameters, were expressed by the Arrhenius relation. The simulation results of a Hunter colour ratioa/bof dried powder at 25°C showed good agreement with the experimental data, suggesting that the proposed model was effective for the prediction of discolouration of dried powder of both types of carrot. The use of the induction period in the manner described may enable the shelf life of dried powder to be predicted. 相似文献
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The fractional outflow rate of water from the rumen, measured as the rate of disappearance of the chromium complex of ethylenediamine tetra-acetic acid, was related to a number of dietary factors. A multiple regression equation was derived which expressed fractional outflow rate as a function of the intakes of dry matter, ash, acid-detergent fibre and crude protein.The data analysed consisted of 243 observations for sheep on 59 diets, including forage, concentrate and mixed diets. The ranges covered by the data were: fractional outflow rate 0.7–3.6 day?1; dry matter intake 560–1400g/day; ash 4–30%, acid-detergent fibre 7–41%, crude protein 5–26 % of dry matter; there were no observations for sheep of less than 34 kg liveweight.The equation accounted for 56·3 % of the total variance. Between-sheep variance could not be calculated for the whole of the data but was undoubtedly substantial since, for a sixth of the data, it was known to account for 38 % of the total variance. 相似文献
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感官检验棉花的品级,这是农村常见的一种检测手段.它的一个主要特点就是存在不确定性.这是由于检验员的品级检验水平存在一定的差异,其中有很多因素制约着检验的结果.文章对影响感官检验结果的因素进行了系统的分析. 相似文献
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从灾害经济学的角度探讨了城镇供水优化调度的必要性和可能性,认为在缺水不可避免的情况下,对供水进行优化调度可以减小缺水带来的损失,产生较好的减灾效益,特别是可以大大减小严重干旱的灾害效应。并根据水资源的特性,提出了缺水损失的计算模式以及优化调度的原则和方法。 相似文献