Ride Comfort Analysis Research Articles

Evaluation of Ride Comfort for Passengers by Means of Computer Simulation

An important aspect of rail vehicle dynamic analysis is a ride comfort analysis and a prediction when passengers and cargo can experience adverse conditions. The computational software utilisation helps to determine forces and accelerations in various positions through the body of the rail vehicle in order to predict ride properties or evaluate ideas for ride comfort in advance. This paper is aimed to the dynamic simulation of the rail vehicle running on a real track. The rail vehicle model creation, computations performance and determination of accelerations badly needed for the ride comfort evaluation is performed by SIMPACK package. Parameters of passenger rail vehicle model correspond to the four-axle two-bogie BR481 rail vehicle. The track model on that the vehicle has been run corresponds to the real track section in Slovakia.

Ride Comfort Analysis of Unsuspended Cabin Tractor Semi-Trailer

This research work uses parameter variation techniques for calculating the set of vehicle parameters that result in the best ride comfort for the driver. Tractor semi-trailer vertical dynamic ride model is developed using 9 degrees-of-freedom. The simulation of the model is conducted using MATLAB. The input to the system is a velocity amplitude function of the vertical road irregularities. Other inputs include the load conditions, vehicle speed and road conditions. The RMS vertical weighted acceleration at the driver’s seat and at the centre of gravity of tractor and semi-trailer for different parameters of the vehicle are assessed for ride comfort analysis.

Ride Comfort Simulation of Minibus under Road Random Input

The plane vibration model of minibus with 7 DOF is used to study ride comfort of minibus under road random input. The system frequency response characteristics based on the road input of front wheel is derived with the analysis method in frequency domain. The frequency response function, power spectral density and root mean square value of vibration response variables are determined. Ride comfort simulation software for minibus under road random input is developed with Matlab and applied to ride comfort analysis of a minibus under road random input. The results show that ride comfort of the minibus is better in the case of full load and road Class B at the speed of 70km/h.

Analysis and Optimization of Ride Comfort for Semi-Active Suspension Based on Variable Damping

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.

Comparative Analysis of Passenger Ride Comfort using Various Semi-Active Suspension Alternatives

In this paper, different semi-active control strategies for non-linear quarter car model equipped with controllable magneto-rheological (MR) shock absorbers and fuzzy logic controller are compared. Polynomial model is selected to characterize the experimental results of MR shock absorber. A combination of Forward Fuzzy Logic Controller (FFLC) and Inverse Fuzzy Logic Controller (IFLC) is designed for proper working of MR shock absorber i.e. generation and supply of control current to MR shock absorber, which provides damping force to suspension system for vibration control purpose. Simulink responses of four different cases are evaluated for passenger ride comfort analysis taking uncontrolled, primary suspension controlled, secondary suspension controlled and fully controlled quarter car models. The obtained results in graphical and mathematical form demonstrate that the fully controlled quarter car system provides excellent performance in suppression of passenger seat vibrations compared to other control strategies while the vehicle travels over the sinusoidal type of input road profile.

Simulation and Analysis of Ride Comfort of 4WD Electric Vehicle

Taking the independent four motorized wheels driving electric vehicle (4WD EV) as study object, the method and index evaluating ride comfort of automobile suspension system were described, and the input model of random road excitation and the dynamics model of 1/4 vehicle vibration system were established, then the simulation of ride comfort of the established model was conducted, so the evaluating indexes’ responses in time domain and frequency domain were obtained. Above all, the changes of these indexes which are suspension damping, spring stiffness and un-sprung mass were analyzed, their effects on the ride comfort of electric vehicle driven by motorized wheel studied, thus provided reference for the development of electric vehicle driven by in-wheel motor.

The Effect of Vibration and Vehicle Body Movement of Car Suspension Systems due to Different Damper Characteristics in Cornering Tests

This paper investigates the effect of vibration and vehicle body movements acting on the vehicles wheel due to the different damping characteristics of suspension systems. Three different damping characteristics damper named Absorber A, Absorber B and Absorber C was installed on the suspension system of the Proton Persona which was used as a test car. This test car was equipped with accelerometers and wire potentiometer sensor on the front and rear suspensions, gyroscopic, Global Positioning System (GPS) and connect with DEWEsoft software as a data acquisition. To study the effect of three different damper characteristics on suspension system, the ride comfort analysis and car body movement analysis were used to analyze the result during experimental testing. There were 3 maneuver testing experiment were performed including steady-state cornering, single-lane change and slalom testing experiment. Based on the results, comparison between the suspension damper characteristics due to the driving maneuvers and car movement were made and their performance also were ranked. Absorber A was the hardest damper as compared to Absorber C and Absorber B according to the damping constant value. The result showed that the best performance for car movement made by Absorber A then followed by Absorber C and Absorber B, while the best performance for ride comfort analysis was made by Absorber B followed by Absorber C and A.

Ride Comfort Simulation of Minibus under Road Pulse Input

The plane vibration model of minibus with seven degree-of-freedom and its vibration response variables are established according to the plane and linear assumptions. The road pulse input is expressed based on Chinese standard with number of GB/T4970-2009. Ride comfort simulation software of minibus under road pulse input is developed with Matlab and applied to ride comfort analysis of minibus under road pulse input. A minibus is selected to analyze its ride comfort and the maximum absolute value of the vibration response variables are obtained at the speed from 10 to 60 kmh-1. The results show that the model and software can be used to ride comfort simulation of a minibus under road pulse input.

Vibration and Ride Comfort Analysis by Using Passenger-Seat Dynamics Models in High Speed Railway Vehicle

Vibration and Ride Comfort Analysis by Using Passenger-Seat Dynamics Models in High Speed Railway Vehicle

Research and Implementation of Vibration Based on Analysis of Vehicle Ride Comfort

Analysis of vehicle ride comfort mainly refers to the vibration and shock environment impact on occupant comfort within certain limits, which will not make people feel comfortable, fatigue and even damage to health performance. Therefore, ride comfort is evaluated mainly based on subjective feelings of the crew, but also for the truck to maintain the performance of the goods in good condition; it is the main performance of modern high-speed car vehicle. The paper proposed a simulation modeling of the vehicle in ADAMS based on the multi-body dynamics theory; we made analysis of vehicle ride comfort on a random road. The result presents the process of building vehicle model and analysis of ride comfort and provides a basis for optimization of vehicle parameters. With this optimized design, the vibration of the vehicle has very significant performance improvements.

타이어 압력 변화에 따른 1/4 MR 댐퍼 차량의 승차감 고찰

This paper presents ride comfort characteristics of a quarter-vehicle magneto-rheological(MR) suspension system with respect to different tire pressure. As a first step, controllable MR damper is designed and modeled based on both the optimized damping force levels and mechanical dimensions required for a commercial full-size passenger vehicle. Then, a quarter-vehicle suspension system consisting of sprung mass, spring, tire and the MR damper is constructed. After deriving the equations of the motion for the proposed quarter-vehicle MR suspension system, vertical tire stiffness with respect to different tire pressure is experimentally identified. The skyhook controller is then implemented for the realization of the quarter-vehicle MR suspension system. Finally, the ride comfort analysis with respect to different tire pressure is undertaken in time domain. In addition, a comparative result between controlled and uncontrolled is provided by presenting vertical RMS displacement.

Frequency-Domain Simulation and Analysis of Vehicle Ride Comfort based on Virtual Proving Ground

Vehicle ride comfort is one of the important properties of modern car. This paper takes a practical model for reference section and a virtual model is established based on virtual proving ground (VPG). By calculating and analyzing simulation results, we can comprehensively and accurately evaluate the model, and do further study of different factors impacting on ride comfort. The main researches include: the multi-body dynamics model and random road surface are established based on VPG. The body acceleration time-domain curves and frequency-domain power spectrums are obtained by LS-DYNA. Total weighted acceleration of vehicle ride comfort is evaluated by root-meansquare method. The effects of suspension system, tire pressure and speed on the vehicle ride comfort are analyzed. Simulation results show that the simulation of vehicle ride comfort based on VPG can truly reflect real test condition and the results achieved are accurate and reliable.

A new approach to improve the vehicle ride comfort by electroencephalogram data

This study develops a new scheme for vehicle ride–comfort analysis based on electroencephalogram (EEG) data. Experiments were carried out using a test course with simultaneous recording of subjects' brainwaves. Subjects' answers to a sensory questionnaire were also analysed. The correlation between the brainwaves and sensory evaluation proved the feasibility of the application of EEG analysis to ride–comfort evaluation. Furthermore, the suspension parameters of the vehicle were modified based on the statistics obtained from the EEG analysis. Finally, by setting up a test model and designing an experiment on a real test course, the goal to improve the ride comfort was achieved.

451 立位姿勢における乗り心地の解析と評価

451 立位姿勢における乗り心地の解析と評価

Ride comfort analysis of a vehicle based on continuous wavelet transform

This paper presents the ride comfort analysis of a vehicle based on wavelet transform. Traditionally, the objective evaluation of impact harshness is based on the vibration dose value (VDV) and frequency weighting method. These methods do not consider the damping effect of the suspension system of a vehicle. In this paper, the damping is estimated using wavelet transform based on Morlet mother wavelet and its effect is considered for the subjective evaluation of impact harshness of a car.

Dynamic analysis of a heavy vehicle using a condensation technique

For conducting dynamic design studies on commercial heavy vehicles, finite element analysis is usually required. Existing dynamic analysis techniques involve significant computation time. In order to reduce the computation time, a dynamic condensation method is proposed in this paper. The condensation technique involves sub-dividing the system under consideration into master and slave sub-systems; usually the number of master degrees-of-freedom (DOF) is significantly smaller than the slave sub-system DOF. A heavy vehicle ride comfort analysis is carried out using the proposed condensation technique and the results are shown to be as accurate as the complete model simulation. A saving in computation time is also demonstrated. However, there are issues such as modal truncation errors that occur when using this technique. The paper briefly addresses guidelines to overcome such issues.