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空气弹簧具有变刚度特性,固有频率可以根据需要而适当的改变,如何控制其刚度适时最优是需要亟待解决的问题.对空气悬架的最优控制方法进行研究.建立1/4车辆动力学模型,然后基于Matlab对模型进行计算机仿真.结果表明,采用最优控制的空气半主动悬架明显提高了汽车平顺性和操纵稳定性. 相似文献
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以车辆的道路友好性及操纵稳定性为研究目标,针对某重型汽车阻尼可调式半主动空气悬架,通过试验得到空气悬架刚度曲线。采用阻尼可调式减振器,利用ADAMS/View建立了车辆1/4动力学模型。在Matlab中设计了模糊控制器,利用滤波白噪声法实现了对随机路面激励的仿真模拟。通过联合仿真,对悬架的道路友好性进行分析。结果表明,采用模糊控制阻尼可调式半主动空气悬架与被动悬架相比,轮胎动变形均方根值降低了5.81%,道路破坏系数降低了12.38%,悬架的动位移降低了13.33%,道路友好性及操纵稳定性得到很大程度的提高。 相似文献
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车辆半主动悬架的模糊控制与仿真 总被引:3,自引:0,他引:3
针对阻尼控制的1/4车体半主动悬架模型,设计了无参考模型的模糊控制器.分别用梯形、高斯和三角形3种隶属函数,采用平均最大隶属度法、面积平分法、最大隶属度最大值法和最大隶属度最小值法4种方法,利用MATLAB软件对输出量精确化进行了仿真分析.结果表明,与被动悬架相比,无参考模型自适应模糊PID控制器的悬架加速度值下降了68%,不同的隶属函数和反模糊化函数都会影响控制效果.其中,以三角形的隶属函数和利用面积平分法进行的精确化,使悬架加速度平均输出小,波动不大.车辆行驶的平顺性得到改善. 相似文献
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在车辆行驶平顺性的研究中,为弥补传统数学建模方法不能完全反映实际整车行驶动态特性的缺点,以多体动力学仿真软件SIMPACK为平台,建立昌河某微型轿车的整车多体动力学模型.利用MATLAB设计半主动悬架模糊控制器,并进行联合仿真分析.仿真结果表明:车速为40km/h时,与被动悬架系统相比,车身垂直加速度、车身俯仰角速度标准差和峰值分别降低了10.76%、18.03%、20.48%、12.13%.有效衰减了车体振动,缓和了路面的振动冲击,改善了整车行驶平顺性,提高了乘坐舒适性. 相似文献
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将空气弹簧的刚度特性曲线编写XML文件,与机械系统仿真分析软件ADAMS结合,建立了空气悬架的客车模型,并根据相关法规在ADAMS/Car Ride环境中对虚拟样机进行平顺性仿真,仿真结果在ADAMS/postprocessor环境中进行处理,给出了一种求得平顺性评价指标较为简便的方法。结果表明分析样车的悬架系统设计合理,虽舒适性随车速提高及路面等级的下降,加权加速度均方根值呈增大趋势,但仍然能保持在主观评价的舒适界限之内。 相似文献
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基于平顺性的油气悬架参数动态分析与优化 总被引:1,自引:0,他引:1
以提高汽车行驶平顺性为目的,对油气悬架系统参数进行优化.建立油气悬架系统的二自由度1/4车辆数学模型.基于数学模型,在Matlab/Simulink软件中利用模块组合的方法建立仿真模型,并构建以车身垂直方向的加权加速度均方根值为目标函数的优化模型.优化算法采用遗传算法,通过编程将仿真模型、优化模型结合起来,实现Simulink、遗传算法对油气悬架系统参数的动态联合优化设计.利用该方法对某矿用自卸车前油气悬架设计阶段的结构参数进行优化,仿真结果表明:由该方法确定的油气悬架结构参数使车身垂直方向的加权加速度均方根值下降29.35%,加速度功率谱密度共振峰值降低23.6%,从而明显改善了汽车的行驶平顺性,同时也为其他类型的非线性悬架系统的动态优化设计提供了借鉴. 相似文献
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The existing researches of the evaluation method of ride comfort of vehicle mainly focus on the level of human feelings to vibration. The level of human feelings to vibration is influenced by many factors, however, the ride comfort according to the common principle of probability and statistics and simple binary logic is tmable to reflect these uncertainties. The random fuzzy evaluation model from people subjective response to vibration is adopted in the paper, these uncertainties are analyzed from the angle of psychological physics. Discussing the traditional evaluation of ride comfort during vehicle vibration, a fuzzily random evaluation model on the basis of annoyance rate is proposed for the human body's subjective response to vibration, with relevant fuzzy membership function and probability distribution given. A half-car four degrees of freedom suspension vibration model is described, subject to irregular excitations from the road surface, with the aid of software Matlab/Simulink. A new kind of evaluation method for ride comfort of vehicles is proposed in the paper, i.e., the annoyance rate evaluation method. The genetic algorithm and neural network control theory are used to control the system. Simulation results are obtained, such as the comparison of comfort reaction to vibration environments between before and after control, relationship of annoyance rate to vibration frequency and weighted acceleration, based on ISO 2631 / 1 (1982), ISO 2631-1 (1997) and annoyance rate evaluation method, respectively. Simulated assessment results indicate that the proposed active suspension systems prove to be effective in the vibration isolation of the suspension system, and the subjective response of human being can be promoted from very uncomfortable to a little uncomfortable. Furthermore, the novel evaluation method based on annoyance rate can further estimate quantitatively the number of passengers who feel discomfort due to vibration. A new analysis method of vehicle comfort is presented. 相似文献
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工程车辆ADAMS建模与平顺性仿真 总被引:1,自引:0,他引:1
利用动力学分析软件ADAMS,建立了钢板弹簧车辆和油气弹簧车辆的动力学模型,开展了整车在随机路面上的平顺性仿真,分析了两种悬架对车辆平顺性的影响,并通过仿真数据与试验数据的对比,验证了动力学模型的正确性. 相似文献
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Han Man Yong Choi Hyung Yun Hirao Akinari 《Journal of Mechanical Science and Technology》2021,35(1):231-236
Journal of Mechanical Science and Technology - Compared to the mesh-based finite element modeling, the lumped-network modeling is more useful for the multi-physical system and the simulation of... 相似文献