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《机械设计与制造》2017,(6)
工程车辆工作环境恶劣,为保证驾驶员能够高效迅速的对复杂行驶路况做出准确反映,需要设计具备良好的乘坐舒适性的驾驶室。根据工程车辆工作环境恶劣的现状,采用计算振动响应的方法研究车辆驾驶室的乘坐舒适性。建立八自由度二分之一车动力学模型,运用拉格朗日方程求解系统的运动微分方程,获得驾驶室在随机路面激励下的振动响应。在驾驶室的竖直方向建立"驾驶员—座椅"分析子系统,驾驶室受到的竖直方向的激励作为子系统的输入,根据驾驶员受到的振动加速度的加权值,对驾驶室的乘坐舒适性进行评价。分析结果可知:评价驾驶员的主观感受为:没有不舒适;减小座椅刚度,能有效的提高驾驶员的舒适性;为同类设计研究提供参考。 相似文献
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针对工程车辆、农用车辆等振动强度大、隔振设施简陋的非路面车辆,提出了一种新型的驾驶员座椅悬架系统--6足并联悬架系统.建立了人椅悬架系统自由振动模型,结合空间具有6自由度的机构形式,根据驾驶员座椅隔振的性能要求进行了6足并联悬架结构形式的分析、比较与选取.仿真结果表明,选定的Stewart 双三角型并联悬架在6个方向均有良好的隔振效果.研究结果对设计多维减振座椅具有指导意义,对提高非路面车辆驾驶员的乘坐舒适性具有促进作用. 相似文献
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为衰减车辆行驶时受到的路面冲击,建立了人-车-路闭环系统数学模型,设计了电动助力转向(EPS)和主动前轮转向(AFS)集成控制算法,运用阻尼补偿控制和最优控制分别设计了电动助力转向和主动前轮转向子系统。在MATLAB/Simulink中的仿真结果表明,单独主动前轮转向控制不能衰减驾驶员把持力矩振动,单独电动助力转向阻尼控制对转向盘角速度振动和车辆横摆角速度振动衰减效果不佳,而集成系统可以很好地同时抑制驾驶员把持力矩振动、转向盘角速度振动和车辆横摆角速度振动,提高了驾驶舒适性、操纵稳定性和行驶安全性。 相似文献
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为了提升工程车辆的行驶平顺性和驾驶员的驾驶舒适性,在工程车辆半主动油气悬架系统力学模型的基础上,综合考虑驾驶室座椅对人体臀部和驾驶室地板对人体小腿两部分振动对驾驶员的影响,参考人体集中质量模型建立人-椅集中质量模型。基于工程车辆半主动油气悬架系统,针对滑模控制策略的稳定性问题,提出基于快速幂次趋近律的模糊滑模控制方法,并将其与被动悬架、模糊滑模控制方法进行方真对比。仿真结果表明,基于快速幂次趋近律的模糊滑模控制方法与被动悬架和模糊滑模控制方法相比,车身垂向加速度分别降低了82.6%和67.6%,车轮动载荷分别降低了46.2%和25.7%;与被动悬架相比,驾驶员总加权加速度降低了71.1%。经频域分析可见,基于快速幂次趋近律的模糊滑模控制器可以明显降低人体内脏和脊椎共振频率范围内的振动,表明基于快速幂次趋近律的模糊滑模控制方法相比于模糊滑模控制方法,可以有效提升工程车辆的行驶平顺性和驾驶员的驾驶舒适性。 相似文献
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汽车驾驶座椅的人机工程学设计 总被引:3,自引:0,他引:3
运用人机工程学原理,针对汽车驾驶座椅,从驾驶员生理特性与作业环境两个方面分析了影响驾驶舒适性及安全性的原因,在此基础上从坐姿舒适性,振动舒适性,操作舒适性,安全性等四个方面论述了汽车驾驶座椅人机工程学设计,完成了对汽车驾驶座椅从分析-设计的系列开发过程. 相似文献
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本文建立了基于车身与车轮双质量系统振动的平顺性仿真模型,利用仿真软件MATLAB/simulink对模型的振动特性进行仿真.通过对比车身固有频率、车身部分阻尼比、车身等系统参数的变化来评价汽车的平顺性能,得到影响汽车行驶平顺的主要因素.在设计开发时加以考虑,从而达到优化汽车性能的目的. 相似文献
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汽车座椅振动舒适性评价 总被引:2,自引:1,他引:2
以ISO 2631对坐姿人体振动舒适性评价为基础,对于特定的座椅振动响应,运用Matiab进行仿真研究,对人体振动舒适性进行定量评价,为不同环境下的座椅设计提供了实验参考. 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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Yu-Jeong Shin Won-Hee You Hyun-Moo Hur Joon-Hyuk Park 《Journal of Mechanical Science and Technology》2012,26(11):3423-3431
As train operating speeds increase, upgrading the performance of the railway vehicle has been required. To improve the ride comfort related to vibration, researches to replace the conventional passive suspension with (semi)active suspension have been carried out. For the purpose of vibration reduction, the magneto-rheological (MR) damper has been widely applied in automobile or anti-vibration areas, but it hasn??t yet been applied to railway vehicles. In this study, skyhook control with the MR damper was applied to the 1/5 scaled railway vehicle model on roller rig to suppress the lateral vibration of the carbody. For the 1/5 scaled prototype model of the railway vehicle, the dimensions of railway vehicle were scaled down by similarity method. Both numerical analysis and experiments to control the carbody lateral vibration were conducted and compared. The possibility of improving both the ride comfort and running stability of the railway vehicle by using the semi-active control was discussed in detail. 相似文献
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对现有车辆车型的平顺性评价分析可为新车型的性能改进提供有效信息.依据国家平顺性的试验标准,以某SUV两款车型为例,在不同车速工况下完成了随机输入行驶试验,直接获得各测量点时域下的振动加速度值,应用Matlab计算频域下的振动加速度功率谱密度,采用加速度均方根值和加权振级相结合的综合评价法对车辆在多工况下的单轴向、总加权... 相似文献
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为了研究单轨车辆在设计车速范围内的振动响应特性,进而评价单轨车辆运行平稳性与舒适性能,分析了单轨车辆走行轮、导向轮、稳定轮和转向架中央牵引装置及车体间的拓扑关系,利用Hamilton方程构建了包含走行轮与轨道梁顶部,导向轮、稳定轮与轨道梁侧部等三向轮轨接触对的单轨车辆空间耦合系统动力学模型,并对单轨的PC轨道梁走行面及轨道梁左、右两侧部轨面的不平度进行了数值模拟。基于空间耦合动力学模型,以轨道不平度为激励源,设定车辆以某一恒定速度在直线轨道上运行,获取了单轨车辆的振动响应特性,并与实车测试结果对比分析,验证了单轨空间耦合动力学模型的正确性。在此基础之上,获取了单轨车辆不同设计车速下的振动响应特性,对单轨车辆的运行平稳性和舒适性进行了评价。结果表明,单轨车辆的舒适性能优良,运行平稳性能处于优秀等级。 相似文献