The Experts below are selected from a list of 155490 Experts worldwide ranked by ideXlab platform
Li Dong-sheng - One of the best experts on this subject based on the ideXlab platform.
-
Ride Comfort Research of off-Road Vehicle Based on Soft Terrain
Computer Simulation, 2011Co-Authors: Li Dong-shengAbstract:The virtual prototype model of an off-Road Vehicle is built based on ADAMS software,and the user-written subroutine for calculating interaction force between elastic tire and soft soil is set up according to the load-sinkage theory.This is done to accurately simulate and predict the ride comfort of the off-Road Vehicle driving on the soft soil.The non-linear contact simulation between elastic tire and soft soil is implemented successfully by using ADAMS software and changing the soil related parameters,and off-Road Vehicle dynamic is simulated on the random input running test.The simulation result shows that the body acceleration,suspension dynamic deformation and tire dynamic load of the Vehicle all change and the displacement of body increases obviously as terrain deformation increases.The suspension adapted to the hard ground is not adapted to the soft road.This model can accurately simulate the impact of the road deformation on Vehicle ride.
Subhash Rakheja - One of the best experts on this subject based on the ideXlab platform.
-
relative ride performance analysis of a torsio elastic suspension applied to front rear and both axles of an off road Vehicle
International Journal of Heavy Vehicle Systems, 2019Co-Authors: Mu Chai, Subhash Rakheja, Wen Bin ShangguanAbstract:Relative ride performance potentials of a torsio-elastic suspension applied to front or rear or both axles of an off-Road Vehicle are investigated. A three-dimensional Vehicle model, incorporating a torsio-elastic suspension, is used to evaluate relative ride responses with different suspension arrangements. The model validity is demonstrated using the reported field-measured responses of a rear-suspended forestry Vehicle. The optimal parameters of the suspension configurations are identified by minimising the vector sum of av and frequency-weighted rotational vibration. Relative ride performance potentials of different suspensions are subsequently investigated for the loaded and unloaded Vehicle in terms of frequency-weighted rms accelerations. The results show that the torsio-elastic suspension is relatively insensitive to variations in Vehicle load. It is shown that the suspension applied to axle of the Vehicle unit supporting driver cabin is more effective in limiting driver vibration, while preserving effective roll stiffness. The fully-suspended Vehicle, however, yields most effective vibration attenuation.
-
Modeling and validation of off-Road Vehicle ride dynamics
Mechanical Systems and Signal Processing, 2012Co-Authors: Alireza Pazooki, Subhash Rakheja, Dongpu CaoAbstract:Increasing concerns on human driver comfort/health and emerging demands on suspension systems for off-Road Vehicles call for an effective and efficient off-Road Vehicle ride dynamics model. This study devotes both analytical and experimental efforts in developing a comprehensive off-Road Vehicle ride dynamics model. A three-dimensional tire model is formulated to characterize tire–terrain interactions along all the three translational axes. The random roughness properties of the two parallel tracks of terrain profiles are further synthesized considering equivalent undeformable terrain and a coherence function between the two tracks. The terrain roughness model, derived from the field-measured responses of a conventional forestry skidder, was considered for the synthesis. The simulation results of the suspended and unsuspended Vehicle models are derived in terms of acceleration PSD, and weighted and unweighted rms acceleration along the different axes at the driver seat location. Comparisons of the model responses with the measured data revealed that the proposed model can yield reasonably good predictions of the ride responses along the translational as well as rotational axes for both the conventional and suspended Vehicles. The developed off-Road Vehicle ride dynamics model could serve as an effective and efficient tool for predicting Vehicle ride vibrations, to seek designs of primary and secondary suspensions, and to evaluate the roles of various operating conditions.
-
ride dynamic evaluations and design optimisation of a torsio elastic off road Vehicle suspension
Vehicle System Dynamics, 2011Co-Authors: Alireza Pazooki, Subhash Rakheja, Dongpu Cao, P E BoileauAbstract:The ride dynamic characteristics of a novel torsio-elastic suspension for off-Road Vehicle applications are investigated through field measurements and simulations. A prototype suspension was realised and integrated within the rear axle of a forestry skidder for field evaluations. Field measurements were performed on forestry terrains at a constant forward speed of 5 km/h under the loaded and unloaded conditions, and the ride responses were acquired in terms of accelerations along the vertical, lateral, roll, longitudinal and pitch axes. The measurements were also performed on a conventional skidder to investigate the relative ride performance potentials of the proposed suspension. The results revealed that the proposed suspension could yield significant reductions in magnitudes of transmitted vibration to the operator seat. Compared with the unsuspended Vehicle, the prototype suspended Vehicle resulted in nearly 35%, 43% and 57% reductions in the frequency-weighted rms accelerations along the x-, y- and z-axis, respectively. A 13-degree-of-freedom ride dynamic model of the Vehicle with rear-axle torsio-elastic suspension was subsequently derived and validated in order to study the sensitivity of the ride responses to suspension parameters. Optimal suspension parameters were identified using the Pareto technique based on the genetic algorithm to obtain minimal un-weighted and frequency-weighted rms acceleration responses. The optimal solutions resulted in further reduction in the pitch acceleration in the order of 20%, while the reductions in roll and vertical accelerations ranged from 3.5 to 6%.
Dongpu Cao - One of the best experts on this subject based on the ideXlab platform.
-
Modeling and validation of off-Road Vehicle ride dynamics
Mechanical Systems and Signal Processing, 2012Co-Authors: Alireza Pazooki, Subhash Rakheja, Dongpu CaoAbstract:Increasing concerns on human driver comfort/health and emerging demands on suspension systems for off-Road Vehicles call for an effective and efficient off-Road Vehicle ride dynamics model. This study devotes both analytical and experimental efforts in developing a comprehensive off-Road Vehicle ride dynamics model. A three-dimensional tire model is formulated to characterize tire–terrain interactions along all the three translational axes. The random roughness properties of the two parallel tracks of terrain profiles are further synthesized considering equivalent undeformable terrain and a coherence function between the two tracks. The terrain roughness model, derived from the field-measured responses of a conventional forestry skidder, was considered for the synthesis. The simulation results of the suspended and unsuspended Vehicle models are derived in terms of acceleration PSD, and weighted and unweighted rms acceleration along the different axes at the driver seat location. Comparisons of the model responses with the measured data revealed that the proposed model can yield reasonably good predictions of the ride responses along the translational as well as rotational axes for both the conventional and suspended Vehicles. The developed off-Road Vehicle ride dynamics model could serve as an effective and efficient tool for predicting Vehicle ride vibrations, to seek designs of primary and secondary suspensions, and to evaluate the roles of various operating conditions.
-
ride dynamic evaluations and design optimisation of a torsio elastic off road Vehicle suspension
Vehicle System Dynamics, 2011Co-Authors: Alireza Pazooki, Subhash Rakheja, Dongpu Cao, P E BoileauAbstract:The ride dynamic characteristics of a novel torsio-elastic suspension for off-Road Vehicle applications are investigated through field measurements and simulations. A prototype suspension was realised and integrated within the rear axle of a forestry skidder for field evaluations. Field measurements were performed on forestry terrains at a constant forward speed of 5 km/h under the loaded and unloaded conditions, and the ride responses were acquired in terms of accelerations along the vertical, lateral, roll, longitudinal and pitch axes. The measurements were also performed on a conventional skidder to investigate the relative ride performance potentials of the proposed suspension. The results revealed that the proposed suspension could yield significant reductions in magnitudes of transmitted vibration to the operator seat. Compared with the unsuspended Vehicle, the prototype suspended Vehicle resulted in nearly 35%, 43% and 57% reductions in the frequency-weighted rms accelerations along the x-, y- and z-axis, respectively. A 13-degree-of-freedom ride dynamic model of the Vehicle with rear-axle torsio-elastic suspension was subsequently derived and validated in order to study the sensitivity of the ride responses to suspension parameters. Optimal suspension parameters were identified using the Pareto technique based on the genetic algorithm to obtain minimal un-weighted and frequency-weighted rms acceleration responses. The optimal solutions resulted in further reduction in the pitch acceleration in the order of 20%, while the reductions in roll and vertical accelerations ranged from 3.5 to 6%.
Bin Zhang - One of the best experts on this subject based on the ideXlab platform.
-
Development of a twin-accumulator hydro-pneumatic suspension
Journal of Shanghai Jiaotong University (Science), 2010Co-Authors: Bo Yang, Sizhong Chen, Lin Yang, Bin ZhangAbstract:A twin-accumulator hydro-pneumatic suspension has been developed based on the off-Road Vehicle in order to meet the requirements of ride comfort. The working principle and elements construct of the developed suspension are studied. And then, a mathematical model of the developed suspension is built. The influence of twin-accumulator hydro-pneumatic suspension parameters on the Vehicle body vertical acceleration, suspension travel and dynamic tyre load is studied by simulation based on a quarter off-Road Vehicle model. The ride comfort of the Vehicle with the developed suspension is studied by a theoretical evaluation; also the ride comfort of the Vehicle with twin-accumulator hydro-pneumatic suspension is compared with the one with single accumulator hydropneumatic suspension in both time domain and frequency domain. The result shows that the twin-accumulator hydro-pneumatic suspension system gives worthwhile improvements in ride comfort compared with the single accumulator hydro-pneumatic suspension, and it is more suitable for off-Road Vehicle.
Zhao Yuzhuang - One of the best experts on this subject based on the ideXlab platform.
-
Research of Twin-accumulator Hydro-pneumatic Suspension
Journal of Mechanical Engineering, 2009Co-Authors: Zhao YuzhuangAbstract:In order to improve the ride performance of the off-Road Vehicle, a twin-accumulator hydro-pneumatic suspension is proposed. Its structure is analyzed, its working principle is described, and its mathematic model is built. Based on the parameters of an off-Road Vehicle, 1/4 Vehicle vibration model is built. Through simulation, the influence of each parameter of twin-accumulator hydro-pneumatic suspension on the Vehicle body acceleration, dynamic deflection of suspension and relative dynamic load of wheel is studied respectively. The results indicate that the interior accumulator has greater influence on the relative dynamic load of wheel than the outside accumulator, and the outside damper has greater influence on the ride performance than the damping hole on the piston. Through optimization of the results, the parameters of twin-accumulator hydro-pneumatic suspension are determined. The ride performance of the Vehicle with twin-accumulator hydro-pneumatic suspension is compared with those of Vehicles with passive hydro-pneumatic suspension and with coil spring in both time domain and frequency domain. The results indicate that the adoption of twin accumulator system can obviously improve the ride performance of Vehicle, and it is more suitable for off-Road Vehicle.
