An air damper possesses the advantages that there are no long term changes in the damping properties, there is no dependence on working temperature and additionally, it has less manufacturing and maintenance costs. As...An air damper possesses the advantages that there are no long term changes in the damping properties, there is no dependence on working temperature and additionally, it has less manufacturing and maintenance costs. As such, an air damper has been designed and developed based on the Maxwell type model concept in the approach of Nishihara and Asami [1]. The cylinder-piston and air-tank type damper characteristics such as air damping ratio and air spring rate have been studied by changing the length and diameter of the capillary pipe between the air cylinder and the air tank, operating air pressure and the air tank volume. A SDOF quarter-car vehicle suspension system using the developed air enclosed cylinder-piston and air-tank type damper has been analyzed for its motion transmissibility characteristics. Optimal values of the air damping ratio at various values of air spring rate have been determined for minimum motion transmissibility of the sprung mass. An experimental setup has been developed for SDOF quarter-car suspension system model using the developed air enclosed cylinder-piston and air-tank type damper to determine the motion transmissibility characteristics of the sprung mass. An attendant air pressure control system has been designed to vary air damping in the developed air damper. The results of the theoretical analysis have been compared with the experimental analysis.展开更多
To study the ride comfort of wheel-hub-driven electric vehicles,a simulation and verifi-cation method based on a combination of ADAMS and MATLAB modeling is proposed.First,a multibody dynamic simulation model of an in...To study the ride comfort of wheel-hub-driven electric vehicles,a simulation and verifi-cation method based on a combination of ADAMS and MATLAB modeling is proposed.First,a multibody dynamic simulation model of an in-wheel motor-driven electric vehi-cle is established using ADAMS/Car.Then,the pavement excitation and electromag-netic force analytical equations are provided based on the specific operating conditions of the vehicle and the in-wheel motor to analyze the impact of the electromagnetic force fluctuation from an unsprung mass increase and motor air gap unevenness on vehicle ride comfort after the introduction of an in-wheel motor.Next,the vibration model and the motion differential equation of the body–wheel dual-mass system of an in-wheel motor-driven electric vehicle are established.The influence of the in-wheel motor on the vibration response index of the dual-mass system is analyzed by using MATLAB/Simulink software.The variation in the vehicle vibration performance index with/without the motor electromagnetic force excitation factor is analyzed and com-pared with the ADAMS multibody dynamics analysis results.The results show that the method based on a combination of ADAMS and MATLAB modeling can forecast the ride comfort of an in-wheel motor-driven electric vehicle,reducing the cost of physical prototype experiments.展开更多
文摘An air damper possesses the advantages that there are no long term changes in the damping properties, there is no dependence on working temperature and additionally, it has less manufacturing and maintenance costs. As such, an air damper has been designed and developed based on the Maxwell type model concept in the approach of Nishihara and Asami [1]. The cylinder-piston and air-tank type damper characteristics such as air damping ratio and air spring rate have been studied by changing the length and diameter of the capillary pipe between the air cylinder and the air tank, operating air pressure and the air tank volume. A SDOF quarter-car vehicle suspension system using the developed air enclosed cylinder-piston and air-tank type damper has been analyzed for its motion transmissibility characteristics. Optimal values of the air damping ratio at various values of air spring rate have been determined for minimum motion transmissibility of the sprung mass. An experimental setup has been developed for SDOF quarter-car suspension system model using the developed air enclosed cylinder-piston and air-tank type damper to determine the motion transmissibility characteristics of the sprung mass. An attendant air pressure control system has been designed to vary air damping in the developed air damper. The results of the theoretical analysis have been compared with the experimental analysis.
基金The authors would like to thank the National Natural Science Foundation of China(Grant Nos.51575001,51605003)the Anhui University Scientific Research Plat-form Innovation Team Building Projects(2016–2018)Anhui Province for sup-porting R&D and innovation projects([2020]479).
文摘To study the ride comfort of wheel-hub-driven electric vehicles,a simulation and verifi-cation method based on a combination of ADAMS and MATLAB modeling is proposed.First,a multibody dynamic simulation model of an in-wheel motor-driven electric vehi-cle is established using ADAMS/Car.Then,the pavement excitation and electromag-netic force analytical equations are provided based on the specific operating conditions of the vehicle and the in-wheel motor to analyze the impact of the electromagnetic force fluctuation from an unsprung mass increase and motor air gap unevenness on vehicle ride comfort after the introduction of an in-wheel motor.Next,the vibration model and the motion differential equation of the body–wheel dual-mass system of an in-wheel motor-driven electric vehicle are established.The influence of the in-wheel motor on the vibration response index of the dual-mass system is analyzed by using MATLAB/Simulink software.The variation in the vehicle vibration performance index with/without the motor electromagnetic force excitation factor is analyzed and com-pared with the ADAMS multibody dynamics analysis results.The results show that the method based on a combination of ADAMS and MATLAB modeling can forecast the ride comfort of an in-wheel motor-driven electric vehicle,reducing the cost of physical prototype experiments.
