共查询到18条相似文献,搜索用时 981 毫秒
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为研究平衡悬架板簧与车桥连接方式对整车平顺性的影响,以国产某重型商用车为研究对象,分别建立滑板座及橡胶墩连接方式下整车刚柔耦合动力学模型并进行平顺性仿真对比,数据揭示橡胶墩连接方式下整车平顺性优于滑板座状态但仍有改善空间.建立以中桥振动传递路径下多测点三向平顺性为目标函数、橡胶墩平动及旋转刚度系数为优化变量及平衡悬架动行程为约束条件的数学模型.应用多软件耦合计算方法将动力学模型、多岛遗传算法、优化变量、目标函数及约束条件集成于多学科优化平台以开展橡胶墩刚度优化.对比优化前后橡胶墩刚度参数下整车平顺性响应,结果表明:橡胶墩刚度参数优化后整车平顺性较优化前提升约9%且主要源于中高频振动降低. 相似文献
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以多体动力学理论为基础,利用机械动力学分析软件ADAMS建立某轻型货车的整车虚拟样机模型,研究悬架系统对乘员舒适性及车辆对道路破坏程度的影响.对行驶平顺性和道路友好性各自的评价指标进行了数值计算,分析了行驶车速、悬架弹簧刚度和减振器阻尼对车辆平顺性和道路友好性的影响, 最后得到了优化的悬架参数.通过比较优化前、后车辆对道路的动载荷,提出了对车辆悬架设计与使用方面的有益建议. 相似文献
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在建立四自由度汽车悬架振动模型的基础上,应用Simulink动态仿真技术对悬架系统进行了动态仿真.得出了悬架系统在路面随机激励下的各种振动响应以及悬架参数对振动响应的影响因素.把各种振动响府作为优化目标函数,应用多目标数学规划理论、Matlab优化工具箱对悬架系统参数进行优化计算,得到优化结果.对不同工况的仿真分析,优化后汽车车身振动加速度得到明显的抑制,同时悬架动行程也得到较好的控制,汽车的行驶平顺性得到明显改善. 相似文献
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利用Adams/View建立三轮车的多刚体动力学模型,并在其中添加驾驶员模型,通过驾驶员控制方向把的转角对跑偏现象进行实时的反馈和调节,从而精确模拟实际车辆在道路上的行驶情况。然后对车辆的平顺性能进行仿真分析,得其振动的加速度,参考汽车的平顺性评价指标,对其平顺性进行评价。在此基础上,以驾驶员座椅垂向加速度均方根值作为目标函数,对三轮车的行驶平顺性进行优化设计,得到前后减振器的刚度、阻尼的最优值,使其乘坐舒适性得到大幅度提高。 相似文献
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在RecurDyn中建立某厢式货车的整车多体动力学模型。基于离散梁法,建立整车模型中的钢板弹簧动力学模型,在板簧模型中,采用用户自定义子程序的方法为弹簧片间定义的三向力,可有效模拟簧片间的接触力和摩擦力,应用基于元模型的优化方法,对钢板弹簧模型的参数进行辨识;基于AR模型开发的路面不平度重构程序,可生成能够被RecurDyn调用的路面文件;进行该厢式货车整车平顺性试验,仿真和实车试验结果验证了所建整车模型的正确性;采用试验设计方法分析了悬架参数及驾驶室悬置参数对平顺性的影响,为平顺性优化时变量范围的选取提供了依据;提出一种采用批处理方式,通过ProcessNet集成AForge.Genetic组件实现遗传算法进行整车平顺性优化的方法,优化后驾驶员脚部地板处总加权加速度均方根值下降了9.35%,提高了厢式货车的平顺性能。 相似文献
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Jung Hoon Kim Kang Sik Kim Yeon June Kang 《Journal of Mechanical Science and Technology》2007,21(7):1066-1076
This study presents a theoretical formulation based on the axiomatic design (AD) approach to suspension systems for improving
both ride comfort and static design factors (SDFs) of passenger vehicles. This approach was adapted to the kinematic design
of suspension systems to create a decoupled or less coupled relationship between the functional requirements (FRs) and design
parameters (DPs). SDFs related to wheel alignment and ride comfort are selected for FRs and suspension hardpoint positions
are chosen for common DPs. A flexible commercial vehicle body model is used to mathematically express SDFs by defining the
performance index and analyzing the dynamic characteristics for ride comfort evaluation. The sensitivity matrices are defined
between the FRs and DPs. The SDF design sequences are proposed by using these matrices with the vehicle model. This study
improves both ride comfort and SDFs by properly designing the kinematic DPs. 相似文献
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Both the seat and cab system of truck play a vital role in ride comfort. The damping matching methods of the two systems are studied separately at present. However, the driver, seat, and cab system are one inseparable whole. In order to further improve ride comfort, the seat suspension is regarded as the fifth suspension of the cab, a new idea of“Five-suspensions”is proposed. Based on this idea, a 4 degree-of-freedom driver-seat-cab coupled system model is presented. Using the tested cab suspensions excitations as inputs and seat acceleration response as compared output, the simulation model is built. Taking optimal ride comfort as target, a new method of damping collaborative optimization for Five-suspensions is proposed. With a practical example of seat and cab system, the damping parameters are optimized and validated by simulation and bench test. The results show the seat vertical frequency-weighted RMS acceleration values tested for the un-optimized and optimized Five-suspensions are 0.50 m/s2 and 0.39 m/s2, respectively, with a decrease by 22.0%, which proves the model and method proposed are correct and reliable. The idea of “Five-suspensions” and the method proposed provide a reference for achieving global optimal damping matching of seat suspension and cab suspensions. 相似文献
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汽车乘员舱安全性与舒适性多学科设计优化 总被引:1,自引:0,他引:1
概念设计阶段汽车乘员舱的安全性和舒适性设计是关键任务,两者具有耦合效应,将多学科设计优化运用到乘员舱的设计中实现两个学科的并行设计。针对某款车的乘员舱布置,在该车100%正面碰撞试验基础上,通过乘员损伤分析软件建立该车的正面碰撞乘员约束系统模型并对模型进行验证用于评估其安全性;同时也基于关节强度的概念建立乘员舒适性模型。将多学科设计优化运用到乘员舱的设计中,避免了传统设计方法对安全性和舒适性的单独优化,实现了两个学科的并行设计,缩短了开发周期,最大化了乘员舱的整体性能。为提高计算效率,通过试验设计构建乘员约束系统的Kriging近似模型用于代替仿真模型。结果表明,该方法在较好地满足乘员安全性的同时提高了乘员的乘坐舒适性,在乘员舱布置方面具有较强的工程实用性。 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