Papers by Keyword: Ride Comfort

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Authors: Li Jun Zhang, Hong Liang Liu, Yue Zhong Li
Abstract: The rubber mount components in suspension system have great influence on ride comfort of automobile. Based on the complex stiffness model and equivalent model of shock absorber rubber mount, the suspension system model with 2DOF including rubber mount components are established by using virtual coordinate. The influences of the stiffness of rubber mount component on the responses of suspension are analyzed in frequency and time domains. The results show that proper stiffness of rubber mount can decrease the acceleration of body by about 20% and dynamic load of tire by about 30% in the frequency range from 5 to 12 Hz compared with that without rubber mount. In addition, the stiffness of rubber mount component leads to lag acceleration of body and higher nature frequency of wheel.
Authors: Saiful Anuar Abu Bakar, Azhar Abdul Aziz
Abstract: This paper presents an evaluation of ride comfort performance of a passenger vehicle when converted into an electric vehicle (EV). The evaluations were done using a validated 7 degrees of freedom of vehicle’s ride model. The developed vehicle’s ride model was used to predict the vehicle’s ride behaviours when subjected to random road profiles. The ride model of EV conversion was then integrated with the active suspension system in order to further improve the EV conversion’s ride comfort performance. It was found that the modifications of a normal passenger vehicle into an EV conversion do not affect vehicle’s ride comfort performance significantly, except the conversion changes only the magnitude of vehicle’s vertical displacement, pitch rate and pitch angle responses. However, the integration of an active suspension system in EV conversions ride model was improves the observed responses of EV conversion’s ride comfort performance by overall improvement of 65.7 percents.
Authors: Dong Yao Jia, Po Hu
Abstract: Demand for objectivity, accuracy and online learning is becoming increasingly important to current evaluations for ride comfort. A data-based appraisal model of riding environmental comfort is proposed in this paper. Physiological indicators data is introduced into the improved supportvector regression(SVR), then, physiological indicators are used to learn online by correcting the parameters of the model. Excellent evaluation capacity is demonstrated through numerical examples, and rating accuracy is 95.6%.
Authors: Shao Bo Zhang, Mei Li, Yan Xia Liu
Abstract: Based on NEWTON and dynamical analysis the half car model is built, in which air spring is a nonlinear system on the basis of force model and the shock absorber has soft and hard states. By the simulation of the model and combination with experiments, the model is proved right and the influencing factor of angle-displacement and acceleration of body can be gained. Then with the application of genetic algorithm in Matlab tools, appropriate control parameters is being set, the above-mentioned model can be optimized, results of optimizations will be compared with three ride comfort evaluation indexes before optimizations. By judging the corresponded extents of curve before and after optimizations, it shows that the parameters after optimizations can improve the ride comfort.
Authors: Ai Hua Tang, Jian Ping Tian, Ying Hua Liao
Abstract: To investigate how the conventional speeds to affect passenger cars ride comfort under a kind of road surface profiles, in multibody dynamics software (ADAMS/Car), a vehicle model was built based on the characteristic parameters of a passenger car. According to the relevant test regulations of ride comfort, the building methods of road surface profiles were discussed. Furthermore, a dynamics simulation analysis of the car was realized by ADAMS/Car and the acceleration-time histories of the seat surfaces X/Y/Z-axis under three conventional driving-speeds were acquired. A special MATLAB program was compiled to calculate the total weighted Root Mean Square (RMS) value by calling the above histories. According to the GB/T 4970-1996, a road test of a passenger car was carried out in the random road surface which equivalent to B level. The car was driven to get the values of total weighted acceleration RMS under three conventional driving-speeds. By comparing the road test result with simulation, the result indicated that the changing trend of total weighted RMS value is consistent as the driving-speed changes, and the ride comfort will decrease when the driving-speed increase. At the same time, it shows that the consistency of the simulation and road test is better.
Authors: Guang Hui Xu, Yan Yang Wang, Yi Nong Li, Wei Sun
Abstract: The vertical vibration of the in-wheel motor electric vehicle (IWM-EV) induced by large unsprung mass is analyzed based on power flow method. The simulation results show that due to the unsprung mass increase of IWM-EV, energy consumption of the suspension and wheel is increasing, which will cause adverse effects on not just the ride comfort but the maneuver stability. To decrease the effect, a new kind of vibration mitigation measure of the vehicle body absorber combined with an active hybrid control integrated the sky-hook and ground-hook methods is developed. The effectiveness of this measure is verified.
Authors: Xiao Zhen Qu, Guang Quan Hou, Hao Liu, Hui He
Abstract: One new negative stiffness suspension is introduced in this paper. The vehicle with negative stiffness suspension has good ride comfort and handling stability. The natural frequency of system could be reduced in vertical direction by applying negative stiffness suspension. The vehicle model with negative stiffness suspension or not is built in ADAMS. The comparison of simulation results show that the vehicle with negative stiffness suspension could reduce the natural frequency of system and vibration transmissibility, and also improve the vehicle ride comfort and vehicle handling stability.
Authors: Noraishikin Zulkarnain, Hairi Zamzuri, Saiful Amri Mazlan
Abstract: This paper presents and analyses a performance comparison between a Linear Quadratic Regulator (LQR) and Composite Nonlinear Feedback (CNF) controllers for an active anti-roll bar (ARB) system. The anti-roll bar system has to balance the trade-off involving ride comfort and handling performance. The basic vehicle dynamic modelling with four degree of freedom (DOF) on half car model is proposed. The design model is validity and the performances of roll angle and roll rate under control of LQR and CNF controller are achieved by using simulation analysis. Both two controllers are modeled in MATLAB/SIMULINK environment. It has to be determined which control strategy delivers better performance with respect to roll angle and the roll rate of half vehicle body to achieve this goal. The result shows, the CNF LQR fusion control strategy improve the performance compared to LQR and CNF control strategy.
Authors: Mădălina Dumitriu, Mihai Leu
Abstract: Ride comfort is a reference point in evaluating the dynamic performance in railway vehicles. There are more methods to assess the ride comfort, depending on the traffic details and the specific needs of a railway administration. This paper focuses on the comfort index methods, in accordance with UIC Leaflet 513 R and the standard of railway applications ENV 12299, and the ride Sperling’s method, formulated by Sperling. A correlation is drawn between the comfort indices corresponding to the two methods, based on the link between the comfort and the values of these indices. The comfort indices derived from the two methods by numerical simulations help with validating the fact that, in general, the velocity influences the vertical ride comfort, and, in particular, the position of the carbody critical points, from the perspective of the ride comfort.
Authors: Xiao Bin Ning, Ping Xu, Bin Bin Qiu
Abstract: In order to analyze the adaptation of an automobile chassis platform in handling stability and ride comfort when assembled in different car models, VC++ and ADAMS were used to develop a specific simulation module for suspension performance analysis of the chassis platform, which could not only create the parametric modeling of the front and rear suspension, the other subsystems and the whole vehicle quickly, but also accomplish the analysis and optimization of handling stability and ride comfort. By adopting this module, kinematic simulation analysis and vehicle simulation model for the front and rear suspension of this chassis platform when assembled in two different cars models named A1, A2 were carried out, then steering pulse simulation analysis which can reflect handling stability, score evaluation and ride comfort in random road were proceeded according to the national standards. The results show that this simulation module has superior application value in engineering and the two different car models equipped with this chassis platform have better handling stability and ride comfort.
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