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为了解决滑板式侧滑仪测滑量检测结果离散性大、重复性差的问题,以滑板为研究对象,通过滑板与轮胎胎面之间侧向力的相互作用,从理论上分析滑板在检测过程中的受力特性,建立滑板横向运动的力学模型和相应的运动微分方程,并对其进行求解,得出滑板位移的理论计算公式和前转向轮在滑板上的运动胎迹;最后分析和讨论了侧滑值受到回位弹簧的刚度、滑板的质量、被检车辆的质量和被检车辆速度的影响规律以及侧滑仪测量误差的形成机理。计算和分析结果表明:滑板的位移是滚动轮胎在滑板上的位置函数,其按一定的角频率波动变化;滑板位移的最大值与滑板所受的侧向力成正比,与弹簧刚度成反比。 相似文献
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采用有限元方法分析了七座小客车碰撞安全的特性,通过特殊焊接形式和约束的施加,建立了与实车相一致的悬架和轮胎模型。整车运用施加质量点等方法,有效地保证了整车模拟碰撞过程的准确性,并成功地完成了与实验结果的对标分析。 相似文献
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通过对非独立悬架中钢板弹簧在整车状态下的运动轨迹的分析,阐述了对称式钢板板簧、非对称式钢板弹簧运动轨迹作图法。运用中心拓展作图法,在CATIA模块中以草图绘制为基础,对板簧和轮心轨迹进行绘制。通过DMU运动仿真模块来模拟板簧的运动方式,对对称和非对称式钢板弹簧运动轨迹进行运动仿真。运用ADAMS方法,根据非独立悬架运动学原理,以模型的空间位置为基础,在整车坐标系下得到了钢板弹簧运动轨迹。通过中心拓展作图法与ADAMS方法对比分析,验证了该方法设计的板簧在轮边、后桥、传动轴等跳动校核中的有效性。 相似文献
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G. Ahmadi J. Hashemi 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》1973,2(4):225-233
The random vibration of a nonuniform cantilever beam with a concentrated mass at its end, is studied as a simple model of the suspension spring of a motor vehicle. The spectral response of the displacement of the concentrated mass is obtained when the beam is subjected to the random motion of the support. The conditions for the validity of the single degree approximation is also discussed. 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(11):1695-1721
This paper presents dynamic contact loads at wheel–rail contact point in a three-dimensional railway vehicle–track model as well as dynamic response at vehicle–track component levels in the presence of wheel flats. The 17-degrees of freedom lumped mass vehicle is modelled as a full car body, two bogies and four wheelsets, whereas the railway track is modelled as two parallel Timoshenko beams periodically supported by lumped masses representing the sleepers. The rail beam is also supported by nonlinear spring and damper elements representing the railpad and ballast. In order to ensure the interactions between the railpads, a shear parameter beneath the rail beams has also been considered into the model. The wheel–rail contact is modelled using nonlinear Hertzian contact theory. In order to solve the coupled partial and ordinary differential equations of the vehicle–track system, modal analysis method is employed. Idealised Haversine wheel flats with the rounded corner are included in the wheel–rail contact model. The developed model is validated with the existing measured and analytical data available in the literature. The nonlinear model is then employed to investigate the wheel–rail impact forces that arise in the wheel–rail interface due to the presence of wheel flats. The validated model is further employed to investigate the dynamic responses of vehicle and track components in terms of displacement, velocity, and acceleration in the presence of single wheel flat. 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(4):225-233
SUMMARY The random vibration of a nonuniform cantilever beam with a concentrated mass at its end, is studied as a simple model of the suspension spring of a motor vehicle. The spectral response of the displacement of the concentrated mass is obtained when the beam is subjected to the random motion of the support. The conditions for the validity of the single degree approximation is also discussed. 相似文献
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Jae Moon Lim 《International Journal of Automotive Technology》2017,18(3):463-472
Lumped Mass-Spring (LMS) model is simple but very effective for the design study of vehicle crashworthiness and occupant safety. To construct the LMS model, the SISAME software and the NHTSA test data were used. Using the SISAME, the weights of mass elements and the load-paths of spring elements were optimally and directly extracted from the test data. Among the various types of spring, the segmented inelastic type of spring was effective for the vehicle crash analysis. In this study, to obtain the occupant injuries such as HIC15 and 3 ms Chest g’s, the LMS model containing the occupant model consisted of the head, chest and pelvis was developed and validated. The modeling for the chest deflection and neck injuries was not considered in this study because of the modeling difficulties and the limitation of the SISAME software. The simulation results of occupants showed good agreements with the test results. The modeling idea for the occupant was simple but very effective. 相似文献
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Jian Zhang Feng Wu Wan-Xie Zhong 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2018,56(2):281-296
A new method is proposed for the solution of the vertical vehicle–track interaction including a separation between wheel and rail. The vehicle is modelled as a multi-body system using rigid bodies, and the track is treated as a three-layer beam model in which the rail is considered as an Euler-Bernoulli beam and both the sleepers and the ballast are represented by lumped masses. A linear complementarity formulation is directly established using a combination of the wheel–rail normal contact condition and the generalised-α method. This linear complementarity problem is solved using the Lemke algorithm, and the wheel–rail contact force can be obtained. Then the dynamic responses of the vehicle and the track are solved without iteration based on the generalised-α method. The same equations of motion for the vehicle and track are adopted at the different wheel–rail contact situations. This method can remove some restrictions, that is, time-dependent mass, damping and stiffness matrices of the coupled system, multiple equations of motion for the different contact situations and the effect of the contact stiffness. Numerical results demonstrate that the proposed method is effective for simulating the vehicle–track interaction including a separation between wheel and rail. 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(6):373-390
In the dynamic simulation of vehicle straight line motion, a vehicle model usually drifts from its intended straight path even in the case of no external input. This is particularly true when a tire model based on experimental data is used. The purpose of this paper is to provide an enhancement of a basic understanding of a tire/vehicle system behavior in the straight line motion and to identify the effect of the tire on that motion. Through the analysis of a two degrees of freedom vehicle model, tire characteristic which causes a lateral drift in the straight line motion is identified. Then the results are confirmed from vehicle test and the simulations with a more complex full-car model. 相似文献
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Jung-Hwan Lee 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2000,33(6):373-390
In the dynamic simulation of vehicle straight line motion, a vehicle model usually drifts from its intended straight path even in the case of no external input. This is particularly true when a tire model based on experimental data is used. The purpose of this paper is to provide an enhancement of a basic understanding of a tire/vehicle system behavior in the straight line motion and to identify the effect of the tire on that motion. Through the analysis of a two degrees of freedom vehicle model, tire characteristic which causes a lateral drift in the straight line motion is identified. Then the results are confirmed from vehicle test and the simulations with a more complex full-car model. 相似文献
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乘坐舒适性是决定乘客对智能车辆接受度的重要因素之一。为了提升智能车辆的舒适性,服务智能驾驶控制算法的设计和优化,开展了基于乘客主观感知的实车乘坐舒适性试验,试验中驾驶人驾驶传统车辆执行多次换道操作,获取了60名被试乘客对换道操作的舒适性评价数据,并采集了车辆的运动数据。选取换道时横向最大加速度、回正时横向最大加速度、横向最大加加速度、横向加速度转换幅值以及横向加速度转换频率这5个车辆运动参数作为研究对象。采用二元Logistic回归单因素分析法分析了这5个车辆运动参数对乘坐舒适性的影响,采用接收者操作特征(ROC)曲线分析法为不同晕车易感性的乘客分别确立了这5个车辆运动参数的舒适性阈值,并根据岭回归分析法确定了不同参数对乘坐舒适性的影响权重。结果表明:所选取的5个车辆运动参数对乘坐舒适性具有显著影响,易晕乘客的舒适性阈值小于不易晕乘客的舒适性阈值,在换道过程中,换道时横向最大加速度、回正时横向最大加速度和横向加速度转换幅值是影响乘坐舒适性的主要因素。最后根据车辆运动参数和乘客生理特征参数建立了基于动态时间归整(DTW)和K最近邻(KNN)算法的乘坐舒适性预测模型,该模型对乘坐舒适性的预测准确率为84%,可用于智能车辆控制算法的舒适性判断。 相似文献
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车辆结构参数和道路环境信息的实时准确获取是提高智能汽车运动控制性能的重要因素之一,而车辆质量与道路坡度信息是多种汽车控制系统的必要信息,因此质量与坡度在线估计的研究一直受到关注。针对车辆质量与道路坡度的联合估计问题,提出了一种基于交互多模型的质量与坡度融合估计方法。首先,设定了适宜进行质量精确估计的工况条件,据此提出了基于模糊规则的质量估计置信度因子计算算法,进而设计了基于置信度因子的递推最小二乘车辆质量估计算法,以实现质量的在线估计。然后,以车辆纵向动力学模型为基础,建立了运动学和动力学2种坡度估计模型,并设计了基于运动学模型的线性卡尔曼滤波坡度观测器,基于电子稳定性程序ESP的纵向加速度信息实现坡度估计,设计了基于动力学模型的无迹卡尔曼滤波坡度观测器,基于ESP和发动机管理系统EMS的力信息实现坡度估计。运动学模型未考虑车辆姿态信息,坡度估算结果与实际值有偏差;动力学模型对模型精度要求高,算法稳定性差,为充分发挥2种方法优势实现坡度的精确估计,采用交互多模型算法实现了2种坡度估计方法的加权融合。最后,对所设计的算法进行了实车试验验证。结果表明:所设计的质量与坡度估算算法具有较好的实时性和准确性,适合智能汽车运动控制的应用需求。 相似文献