scholarly journals Modelling and analysis of gradient effect on the dynamic performance of three-wheeled vehicle system using Simscape

2019 ◽  
Vol 1 (3) ◽  
Author(s):  
Mohammad Waseem ◽  
Mohd Suhaib ◽  
Ahmad Faizan Sherwani
Keyword(s):  
Dynamic Performance ◽  
Gradient Effect ◽  
Wheeled Vehicle ◽  
Vehicle System

Analysis and Calculation of Electromagnetic Torque for the Voltage Source Traction Motors

2013 ◽  
Vol 446-447 ◽  
pp. 672-677
Author(s):  
Xiao Yu Wu ◽  
Zhe Ming Chen ◽  
Ze Hao Huang
Keyword(s):  
High Speed ◽  
Dynamic Performance ◽  
Voltage Source ◽  
Electromagnetic Torque ◽  
Motor Speed ◽  
Traction Motor ◽  
Traction Motors ◽  
Vehicle System ◽  
Mathematical Formulas ◽  
The Time Domain

The traction motor installed on the high-speed train is powered by inverter. A large number of harmonics may appear when motor is operating. Then the motor speed generate oscillation and finally the dynamic characteristic is affected in vehicle system. In this paper, relied on the electromagnetism of traction motor, the mechanism about emerging harmonic torque is analyzed. In addition, based on the equivalent circuit, the method of calculating the parameters in harmonic circuit is proposed. Two mathematical formulas are also proposed to obtain the fundamental electromagnetic torque and the harmonic electromagnetic torque on traction motor. The time domain and frequency domain distributions of the torques are gained and analyzed. Finally a calculation example of traction motor harmonic torque was analyzed and calculated, and prepared for further study of harmonic torque impacting on vehicle system dynamic performance.

Acceleration-Based Remaining Life Prognostics for Terrain-Loaded Components on an Army Ground Vehicle System

2009 ◽  
Vol 52 (2) ◽  
pp. 40-49 ◽  
Author(s):  
Richard Heine ◽  
Donald Barker
Keyword(s):  
Department Of Defense ◽  
Remaining Life ◽  
Ground Vehicle ◽  
Wheeled Vehicle ◽  
Vehicle System ◽  
Acceleration Sensors ◽  
And Performance ◽  
Critical Components ◽  
The Military ◽  
Wheeled Vehicles

Use of a health and usage monitoring system (HUMS) is one method the Department of Defense is investigating to meet conflicting cost and performance goals for Army wheeled vehicles. One area where a HUMS would be of great benefit is monitoring critical components vulnerable to terrain-induced fatigue. While strain is typically the desired input to a fatigue model, acceleration sensors are less susceptible to damage from the military ground vehicle environment and provide more reliable data over long periods of usage. The feasibility of using vibratory inputs from an accelerometer to make component fatigue predictions for a military wheeled vehicle system is explored in this study, and the use of limited subsets of data for algorithm training are evaluated. An example component is used to demonstrate that the proposed HUMS algorithms are appropriate and provide suitably accurate fatigue predictions.

Health and Usage Monitoring Algorithm Based on Terrain Identification for Mechanical Components on an Army Ground Vehicle System

2008 ◽  
Vol 51 (2) ◽  
pp. 31-41 ◽  
Author(s):  
Richard Heine ◽  
Donald Barker
Keyword(s):  
Unit Cost ◽  
Monitoring Systems ◽  
Statistical Parameters ◽  
Ground Vehicle ◽  
Wheeled Vehicle ◽  
Vehicle System ◽  
Basic Set ◽  
Vehicle Systems ◽  
Monitoring Algorithm

The desire for enhanced functionality of Army vehicle systems has resulted in increasingly complex systems. This drive is in direct contention with another Army goal of improved reliability. Health and usage monitoring systems (HUMS) and remaining-life prognostics are being developed to address these conflicting goals. One of the major challenges of applying a HUMS to an Army wheeled vehicle system is that the development and per unit cost of the HUMS needs to be relatively low in comparison with typical high-cost applications such as aircraft. Simplified algorithms that derive terrain exposure from a basic set of sensors and estimate fatigue damage accumulated on components where loading comes primarily from terrain have been developed to meet this need. Various inputs and statistical parameters are evaluated for this model based on accuracy of terrain identification and quality of fatigue prediction on an example component. The generalized process and recommendations for application of this model to military ground vehicle systems are discussed.

Vibration Transfer Analysis of High Speed Train Considering Car body Flexibility

2012 ◽  
Vol 605-607 ◽  
pp. 1168-1171 ◽  
Author(s):  
Tian Li Chen ◽  
Jing Zeng ◽  
Yao Hui Lu ◽  
Li Min Zhang
Keyword(s):  
System Dynamics ◽  
Vibration Frequency ◽  
High Speed ◽  
Natural Vibration ◽  
Dynamic Performance ◽  
System Dynamic ◽  
Natural Vibration Frequency ◽  
Car Body ◽  
Vehicle System ◽  
Vehicle System Dynamics

In order to research the influence of the flexible car body on the vehicle system dynamic performance and to achieve the reasonable match between high speed and lightweight，it is necessary to build vehicle system dynamic model with the rigid car body replaced by the flexible car body. Due to the lower structure natural vibration frequency of car body, the influence of carbody flexibility on vehicle system dynamic performance is more influential. The influences of structural vibration of car body on vehicle system dynamics performance were studied by finite element analysis (FEA) method and multi-body system (MBS) dynamics theory. Rigid-flexible coupled vehicle system dynamic models were built up and the car body key location’s vibration was analyzed through vibration transmission chain. The results show that the influences of high speed carbody structure vibration on vehicle system dynamics performance are distinguished especially in the domain of car body natural vibration frequency.

scholarly journals Numerical Investigation into the Critical Speed and Frequency of the Hunting Motion in Railway Vehicle System

2019 ◽  
Vol 2019 ◽  
pp. 1-15 ◽  
Author(s):  
Jianfeng Sun ◽  
Maoru Chi ◽  
Wubin Cai ◽  
Xuesong Jin
Keyword(s):  
High Speed ◽  
Critical Speed ◽  
Dynamic Performance ◽  
Decisive Role ◽  
Creep Model ◽  
Railway Vehicle ◽  
Sudden Increase ◽  
Nonlinear Creep ◽  
Vehicle System ◽  
Hunting Frequency

The critical speed and hunting frequency are two basic research objects of vehicle system dynamics and have a significant influence on the dynamic performance. A lateral dynamic model with 17 degrees of freedom was established in this study to investigate the critical speed and hunting frequency of a high-speed railway vehicle. The nonlinearities of wheel/rail contact geometry, creep forces, and yaw damper were all considered. A heuristic nonlinear creep model was employed to estimate the contact force between the wheel and the rail. The Maxwell model, which covers the influence of the stiffness characteristic, is used to simulate the yaw damper. To reflect the blow-off of the yaw damper, the damping coefficient is described by stages. Based on the mathematical model, the combined effects of vehicle parameters on the critical speed in the straight line and hunting frequency of the wheelset were investigated innovatively. The novel phenomenon that the hunting frequency exhibits a sudden increase from a smaller value to a larger value when the blow-off of the yaw damper occurs was discovered during the calculations. The extents to which various parameters affect the critical speed and hunting frequency are clear on the basis of the numerical results. Moreover, all of the parameter values were divided into three sections to determine the sensitive range for the critical speed and hunting frequency. The results show that the first section of values plays the decisive role on both the critical speed and the hunting frequency for all parameters analyzed. The investigation in this paper enriches the study of hunting stability and gives some ideas to probably solve the abnormal vibrations during the actual operation.

Design of and Research on PID Algorithm-Based Intelligent Vehicle Control System

2013 ◽  
Vol 765-767 ◽  
pp. 1826-1829
Author(s):  
Liu Chen ◽  
Xing Hong Jing
Keyword(s):  
Control System ◽  
Dynamic Performance ◽  
Vehicle Control ◽  
Intelligent Vehicle ◽  
Pid Algorithm ◽  
Speed Of Response ◽  
Vehicle System

Feedforward - Improve PID algorithm is an effective method of intelligent vehicle control, the algorithm not only enables the intelligent vehicle system with a good dynamic performance and speed of response, but also improves the adaptability and robustness of the system, making the intelligent vehicle able to stably operate on different runways at a faster speed. This method has good application prospect.

Feedforward Improved PID Algorithm to Control the Smart Car

2014 ◽  
Vol 989-994 ◽  
pp. 3464-3467
Author(s):  
Ying Hui Xie ◽  
Xiao Qiu Liu
Keyword(s):  
Dynamic Performance ◽  
Vehicle Control ◽  
The Self ◽  
Intelligent Vehicle ◽  
Control Methods ◽  
Pid Algorithm ◽  
Vehicle System ◽  
Digital Pid ◽  
Direction Control ◽  
Current Algorithm

In the self-designed smart car, to control the speed and direction is the control core of the intelligent vehicle system . Due to hardware limitations, there is a delay in the smart car speed and direction control, which is adversely affected for the control of the smart car . For the above problems, the intelligent vehicle control will be applied by the feedforward and feedback control methods, the disturbance which is caused by the deviation will be treated in advance, Digital PID algorithm is improved , the incomplete differential and differential current algorithm is introduced to the PID algorithm to improve the dynamic performance of the system. Aftet this new algorithm is adopted, the dynamic performance of the intelligent vehicle system has been greatly improved.

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