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建立了单自由度非线性座椅模型,并对座椅支撑进行优化设计,使座椅支撑系统的非线性刚度与阻尼参数值更匹配,减小了座椅支撑系统的振动传递率,达到最优的减振效果,提高了座椅的平顺性,为开发相关的非公路车辆减振座椅提供了理论依据。 相似文献
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针对座椅结构参数对剪式座椅减振性能影响尚不明确的问题,对JF-C-01型汽车剪式座椅结构参数变化与其减振性能关系进行了研究。对座椅悬架结构特点、减振特性影响因素和座椅性能研究方法进行了归纳,提出了一种剪式座椅减振特性的分析方法;通过力学分析推导了座椅悬架的运动微分方程,得到了驾驶员-座椅悬架单自由度简化模型;采用数值仿真法分析了阻尼器倾角、弹簧位置、剪杆长度和倾角变化对座椅减振性能的影响。研究结果表明:阻尼器倾角对座椅减振性能影响明显,随着阻尼器倾角的减小,座椅在隔振区的振动衰减能力增强,但振动放大区的峰值频率和振幅均有所增加;弹簧位置、剪杆长度和倾角在座椅尺寸范围内变化时对座椅减振性能的影响很小;该模型可为剪式座椅的结构性能优化提供依据。 相似文献
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基于人因工程学的座椅设计与评价 总被引:1,自引:0,他引:1
利用人因工程学原理,对座椅的设计进行了较为深入的研究.对不同功能的座椅进行了不同的设计,尤其对座椅的椅面、高度、宽度、深度及倾角和靠背的高度、宽度及倾角作了详细的阐述,利用人因工程学原理,设计出了最安全、最舒适的座椅,并对座椅进行了分析评价,提高了座椅的工作效率和舒适性. 相似文献
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摇头飞椅运行过程中,座椅载荷不断变化,精确的载荷数据对座椅骨架的安全评价至关重要。通过ANSYS Workbench软件,对摇头飞椅进行动力学仿真计算,获取座椅在整个运行周期上的载荷时间历程曲线,提取整个运行周期内座椅载荷的最大值,对座椅骨架进行有限元分析,并依据GB 8408-2018《大型游乐设施安全规范》对分析结果进行安全性评价,保证了座椅的安全性,提高了设计效率和计算精度,并为指导设计生产提供了理论依据。 相似文献
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Rollover and jack-knifing of tractor semi-trailer are serious threats for vehicle safety,and accordingly active safety technologies have been widely used to reduce or prevent the occurrence of such accidents.However,currently tractor semi-trailer stability control is generally only a single hazardous condition (rollover or jack-knifing) control,it is difficult to ensure the vehicle comprehensive stability of various dangerous conditions.The main objective of this study is to introduce a multi-objective stability control algorithm which can improve the vehicle stability of a tractor semi-trailer by using differential braking.A vehicle controller is designed to minimize the likelihood of rollover and jack-knifing.First a linear vehicle model of tractor semi-trailer is constructed.Then an optimal yaw control for tractor using differential braking is applied to minimize the yaw rate and lateral acceleration deviation of tractor,as well as the hitch articulation angle of tractor semi-trailer,so as to improve the vehicle stability.Second a braking scheme and variable structure control with sliding mode control are introduced in order to achieve the best braking effect.Last Fishhook maneuver is introduced to the active safety simulation and the active control system effect verification.The simulation results show that multi-objective stability control algorithm of semi-trailer could improve the vehicle stability significantly during the transient maneuvers.The proposed multi-objective stability control algorithm is effective to prevent the vehicle rollover and jackknifing. 相似文献
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半挂汽车列车横向失稳的非线性动力学机制 总被引:2,自引:1,他引:2
半挂汽车列车载运工况变化较大,横向失稳机制复杂,给整车及稳定性控制系统的开发设计带来困难。应用非线性动力学的相关理论,研究半挂汽车列车在极限操纵工况下的平衡点分岔、相轨迹和Hopf分岔特性以及与载运工况的关系;在此基础上,结合不足转向梯度和系统阻尼特性对不同横向失稳形式的发生机制进行探讨。结果表明,载运工况的变化可能导致系统出现鞍结分岔、Hopf分岔和同宿轨道等非线性动力学现象;牵引车后轴侧滑而导致折叠是半挂汽车列车主要的横向失稳形式,挂车甩尾与折叠密切相关,挂车甩尾会同时加剧牵引车侧滑而加剧折叠,横向摆振与Hopf分岔密切相关,一般仅在载重较大且半挂车质心显著靠后才可能发生,且横向摆振失稳一般都会进一步发展到折叠而完全失控,选择牵引车横摆角速度和挂车侧偏角为控制变量设计稳定性控制系统有望取得较好的效果。 相似文献
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Shahram Azadi Ali Jafari Masoud Samadian 《Journal of Mechanical Science and Technology》2014,28(3):837-848
Directional response and roll stability characteristics of a partly filled tractor semi-trailer vehicle, with cylindrical tank, under different parameters and conditions are investigated. The effective parameters and conditions in the stability of a tractor semi-trailer carrying liquid can be considered as filled volume, kinematic viscosity of liquid cargo and vehicle steering input. The dynamic interaction of liquid cargo with the tractor semi-trailer vehicle is evaluated by integrating a dynamic slosh model of the partly filled tank with five-degrees-offreedom of a tractor semi-trailer tank model. The dynamic fluid slosh within the tank is modeled using three-dimensional Navier-Stokes equations, coupled with the volume-of-fluid equations and analyzed using FLUENT software. The coupled tank-vehicle model is subsequently analyzed to determine the roll stability characteristics for different conditions and maneuvers. The results show effects of parameter variations on roll stability of the vehicle carrying liquid and also fluid’s behavior in interaction with a vehicle’s dynamics. 相似文献
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在分析了影响拖拉机造型中比例变化的因素的基础上,应用数理统计方法,对各国不同时期的轮式拖拉机造型中的比例进行了分析,找出其变化规律,为现代企业设计出美观的拖拉机造型提供了较有价值的参考 相似文献
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通过PC-Crash软件建立自行车、骑车人和汽车模型,并进行事故仿真试验。引入自行车的座高参数对骑车人损伤进行研究,可以进一步深入的分析骑车人损伤情况。通过分析典型碰撞事故中自行车座椅高度参数对骑车人头部和下肢损伤的影响,同时建立了相应的数学模型,并通过真实事故案例验证了模型的可靠性。仿真试验的结果表明,当汽车车头中部与自行车发生碰撞,且座高较低时,骑车人头部碰撞位置主要集中在引擎盖中上部;随着座椅高度的增加,头部碰撞位置逐渐上移到靠近挡风玻璃上边框的位置;受车型影响,自行车座椅高度参数对骑车人造成的影响具有不同特点;在各个碰撞角度下,不同自行车座高所对应的骑车人动力学响应有所差异;骑车人头部损伤风险和下肢骨折风险与自行车座高具有相关性。 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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半挂牵引车车架结构强度有限元分析及优化 总被引:2,自引:0,他引:2
针对某半挂牵引车车架建立了有限元分析模型,并应用有限元分析软件对各种工况下的车架强度进行了有限元分析,为半挂牵引车车架的设计及改进提供了参考依据。 相似文献
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介绍用单片微机控制的拖拉机自动助力系统的结构、特点、运动特性和微机控制系统的控制数据、工作原理。利用拖拉机的滑转率综合指标为控制依据,当滑转率超过给定值时,单片微机控制的助力装置工作,使拖拉机的滑转率减小,提高拖拉机的牵引性能;而当滑转率小于给定值时,单片微机控制的助力装置停止工作,这时拖拉机处于原工作状态。模型试验装置的调试和试验表明本系统运转良好,控制准确,能降低试验装置的滑转率。 相似文献