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1.
D. Yadav S. Kamle S. Talukdar 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2000,33(1):1-28
Analysis for response statistics evaluation of a flexible vehicle travelling with variable velocity over nonhomogeneously profiled flexible track is presented with a heave-pitch-roll model. The vehicle body is idealised as a flexible member with variable cross-section, inertia, damping and stiffness distributions. The vehicle may also have variable section slender elastic attachments. Coupled dynamics with rigid body heave-pitch-roll modes and elastic bending-torsion modes of the vehicle body along with coupled bending-torsion modes of the attachments are considered. Equivalent linear suspension system characteristics are employed for developing the analysis. Numerical results are presented for an aircraft with tricycle landing gear arrangements and comparison is made with other models. 相似文献
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S. Talukdar Graduate Student S. Kamle Associate Professor D. Yadav Professor 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》1998,29(1):1-26
Multi-wheeled vehicles travelling on a rough track are subjected to unequal inputs at different wheel locations and are set to oscillate in various combinations of possible modes. Elastic bending and torsional deformations may be critical in design for vehicles with slender flexible body and components. In the present study, an analytical approach has been developed to study the track induced heave-pitch dynamics of a linear vehicle model composed of lumped masses and slender, non uniform section elastic attachments in coupled bending-torsion modes. Exact modal solutions for the variable section beam member with general end conditions have been derived and utilised to develop the second order response statistics for the system. Results are presented for an aircraft model with tapered flexible wings during ground runs on a non homogeneously profiled track supported by elastic foundation. 相似文献
3.
《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(12):1905-1922
The stiffness of the body structure of an automobile has a strong relationship with its noise, vibration, and harshness (NVH) characteristics. In this paper, the effect of the stiffness of the body structure upon ride quality is discussed with flexible multibody dynamics. In flexible multibody simulation, the local elastic deformation of the vehicle has been described traditionally with modal shape functions. Recently, linear model reduction techniques from system dynamics and mathematics came into the focus to find more sophisticated elastic shape functions. In this work, the NVH-relevant states of a racing kart are simulated, whereas the elastic shape functions are calculated with modern model reduction techniques like moment matching by projection on Krylov-subspaces, singular value decomposition-based reduction techniques, and combinations of those. The whole elastic multibody vehicle model consisting of tyres, steering, axle, etc. is considered, and an excitation with a vibration characteristics in a wide frequency range is evaluated in this paper. The accuracy and the calculation performance of those modern model reduction techniques is investigated including a comparison of the modal reduction approach. 相似文献
4.
G. Mirone 《International Journal of Automotive Technology》2010,11(4):461-469
The elastic response of a vehicle to an applied force determines the dynamic performance, comfort, and support of the vehicle,
where the elastic response depends primarily on the stiffness of the frame/chassis. Significant variations in the dynamic
response of a vehicle are typically achieved with suitable shock absorbing systems, which contribute significantly to whole
body flexibility. The defining feature of a go-kart is the lack of devices capable of absorbing shock and dampening vibration.
The tires and body of a go-kart, which consist of a frame of welded beams, must also function as a shock absorption system.
The objective of this study was to reproduce the elastic behavior of a commercially available Italian go-kart by modeling
the frame in a multibody ADAMS environment and to determine the effect of elastic features on the dynamic performance of the
vehicle. Frame stiffness was assessed by applying a static torsion moment, while the circular trajectory of the go-kart was
evaluated at different speeds and steering wheel angles. The proposed multibody, flexible model was validated by comparing
the static and dynamic response of the go-kart in simulated and experimental analyses. The results of numerical simulations
demonstrated that this method may be extended to the design of customized go-kart frames and to the tuning of go-karts for
specific racing conditions. 相似文献
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通过对全球乘用车传动及底盘结构进行统计分析,给出了乘用车驱动方式与车长、手动变速器与车长、自动变速器与车长、前单横臂后扭力梁组合与车长、前单横臂后多连杆组合与车长、前双横臂后多连杆组合与车长、装空气弹簧车辆与车长关系的统计数据。论述了乘用车不同车身形式所采用的弹性元件与稳定杆类别,以及乘用车所采用的不同制动方式。 相似文献
7.
Lai Wei Jing Zeng Maoru Chi Jianbin Wang 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2017,55(9):1321-1342
In particular locations of the high-speed track, the worn wheel profile matched up with the worn rail profile will lead to an extremely high-conicity wheel–rail contact. Consequently, the bogie hunting instability arises, which further results in the so-called carbody shaking phenomenon. In this paper, the carbody elastic vibrations of a high-speed vehicle in service are firstly introduced. Modal tests are conducted to identity the elastic modes of the carbody. The ride comfort and running safety indices for the tested vehicle are evaluated. The rigid–flexible coupling dynamic model for the high-speed passenger car is then developed by using the FE and MBS coupling approach. The rail profiles in those particular locations are measured and further integrated into the simulation model to reproduce the bogie hunting and carbody elastic vibrations. The effects of wheel and rail wear on the vehicle system response, e.g. wheelset bifurcation graph and carbody vibrations, are studied. Two improvement measures, including the wheel profile modification and rail grinding, are proposed to provide possible solutions. It is found that the wheel–rail contact conicity can be lowered by decreasing wheel flange thickness or grinding rail corner, which is expected to improve the bogie hunting stability under worn rail and worn wheel conditions. The carbody elastic vibrations caused by bogie hunting instability can be further restrained. 相似文献
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五连杆悬架的刚体运动学和弹性运动学分析 总被引:8,自引:0,他引:8
探讨了基于矢量分析原理进行五连杆悬架的刚体运动学和受力分析的方法,并进一步提出了一种考虑橡胶衬套弹性的悬架弹性运动学迭代计算方法。据此编制了相应的计算机程序,进行了一种轿车五连杆后悬架的刚体运动学和弹性运动学模拟分析,探讨了悬架橡胶衬套的弹性对车辆性能的影响。该方法有效简捷,可方便地应用于五连杆悬架设计分析和参数优化。 相似文献
10.
《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(10):1563-1584
A virtual test rig is presented using a three-dimensional model of the elasto-kinematic behaviour of a vehicle. A general approach is put forward to determine the three-dimensional position of the body and the main parameters which influence the handling of the vehicle. For the design process, the variable input data are the longitudinal and lateral acceleration and the curve radius, which are defined by the user as a design goal. For the optimisation process, once the vehicle has been built, the variable input data are the travel of the four struts and the steering wheel angle, which is obtained through monitoring the vehicle. The virtual test rig has been applied to a standard vehicle and the validity of the results has been proven. 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(6):521-539
This work presents theory as well as implementation of a modally distributed damping system with electronically controlled variable dampers. The presented approach follows from estimation of vehicle modal motions, through calculation of desirable modal damping forces to distribution of forces on the utilised dampers. The response time of the damping system is first evaluated in a damper test rig. The damping system is then implemented on a 4×2 tractor that is connected to a semi-trailer. Several road tests are performed to investigate how the system work under real driving conditions on a real vehicle, that includes nonlinearities and chassis frame flexibility that are theoretically unaccounted for, together with the limitations that comes with the control algorithm implementation. It is shown that the approach works and that it results in a considerable improvement for both the bounce and pitch modes, i.e. the system enables selecting damping for the sprung mass modes separately. 相似文献
14.
《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(10):1115-1133
A practical method to determine the zone of two contact points and the transfer of wheel–rail forces between two rails in a turnout is presented in this paper. The method is based on a wheel–rail elastic penetration assumption and used to study a turnout system for a 200 km/h high-speed railway in China. Rail profiles in a number of key sections in the turnout are identified first, and profiles in other sections are then obtained by interpolation between key sections. The track is modelled as flexible with rails and sleepers represented by beams and the interaction between the vehicle and turnout is simulated for cases of the vehicle passing the turnout. Results are mainly presented for two-point contact positions and the characteristics of the wheel–rail forces transference. It is found that the heights of the switch and crossing rail top have significant effects on the wheel–rail contact forces. Finally, the optimised top height for the crossing rails is proposed to reduce the system dynamic force in the turnout system. 相似文献
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Xingwen Wu Subhash Rakheja Sheng Qu Pingbo Wu Jing Zeng A.K.W. Ahmed 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2018,56(12):1817-1837
The polygonal wear around the wheel circumference could pose highly adverse influences on the wheel/rail interactions and thereby the performance of the vehicle system. In this study, the effects of wheel polygonalisation on the dynamic responses of a high-speed rail vehicle are investigated through development and simulations of a comprehensive coupled vehicle/track dynamic model. The model integrates flexible slab track, wheelsets and axle boxes subsystem models so as to account for elastic deformations caused by impact loads induced by the wheel polygonalisation. A field-test programme was undertaken to acquire the polygonal wear profile and axle box acceleration response of a high-speed train, and the data are used to demonstrate the validity of the coupled vehicle/track system model. Subsequently, the effects of wheel polygonalisation are evaluated in terms of wheel/rail impact forces, axle box vertical acceleration and dynamic stress developed in the axle considering different amplitudes and harmonic orders of the polygonal wear. The results suggest that the high-order wheel polygonalisation can give rise to high-frequency impact loads at the wheel/rail interface, and excite some of the vibration modes of the wheelset and the axle box leading to high-magnitude axle box acceleration and dynamic stress in the wheelset axle. 相似文献
17.
Jian Han Shuoqiao Zhong Xinbiao Xiao Zefeng Wen Guotang Zhao 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2018,56(8):1233-1249
A rotating flexible wheelset model is developed and integrated into a vehicle/track dynamic model. Flexible wheelset modes with natural frequencies less than 1000?Hz are considered in the wheelset modelling. An innovation of the paper is that wheel/rail rolling contact calculation considers the effect of the wheelset flexibility and the rotating effect. By introducing two half dummy rigid wheelsets the rolling contact between the flexible wheelset and the two rails can be transformed to that between a rigid wheelset and the rails. As an extension application, the wheel OOR (Out-Of-Round) wears with the 11th, 15th, and 17th orders are used to the vehicle system dynamic model with rigid, flexible and rotating-flexible wheelset model. The results of the three models are compared to study the influence of wheelset flexibility and rotation. The ‘online searching contact method’ developed in this paper is compared with the traditional contact method with considering the rotating flexible wheelset. And then a measured OOR is used to excite the rotating flexible wheelset, the response of which is analysed and verified. 相似文献
18.
文章研究了柔性托台对承载式车身汽车底盘拼合的影响研究。包括传统汽车底盘拼合工艺和柔性托台汽车底盘拼合工艺。结果表明柔性托台相较于传统汽车底盘拼合工艺,有着一次性投资高;但托台设计简单,拼合精度高,台面支撑少,便于实现自动拼合及紧固的优点;解决不同车型共线难题,使总装车间生产制造更加高效,智能。 相似文献
19.
《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(5):587-617
Modern software tools have enhanced modelling, analysis and simulation capabilities pertaining to control of dynamic systems. In this regard, in this paper a full vehicle model with flexible body is exposed by using MSC. ADAMS and MSC. NASTRAN. Indeed, one of the most significant vehicle dynamic controls is directional stability control. In this case, the vehicle dynamic control system (VDC) is used to improving the vehicle lateral and yaw motions in critical manoeuvres. In this paper, for design the VDC system, an optimal control strategy has been used for tracking the intended path with optimal energy. For better performance of VDC system, an anti-lock brake system (ABS) is designed as a lower layer of the control system for maintaining the tyre longitudinal slip in proper value. The performances of the controller on rigid and flexible models are illustrated, and the results show the differences between the control efforts for these models, which are related to the differences of dynamic behaviours of rigid and flexible vehicle dynamic models. 相似文献
20.
轮胎包容特性分析及其在汽车振动系统建模中的应用 总被引:9,自引:0,他引:9
本文分析了轮胎与路面的接触特点,将汽车承载系统简化为二自由度垂直振动系统,建立了同时考虑轮胎几何滤波效应与弹性滤波效应的弹性滚子接触模型。基于刚性滚子模型和弹性滚子模型,仿真出滚子包容后的有效路形。 相似文献