Simulation of Ride Comfort of Tracked Vehicle Based on Road Random Excitation

2012 ◽  
Vol 479-481 ◽  
pp. 93-97 ◽  
Author(s):  
Pi Jing Liu ◽  
Liang Hou ◽  
Wen Guang Lin ◽  
Xiu Yi Yu ◽  
Wei Huang
Keyword(s):  
White Noise ◽  
Theoretical Foundation ◽  
Ride Comfort ◽  
Simulation Analysis ◽  
Random Excitation ◽  
Tracked Vehicle ◽  
Road Roughness ◽  
Simulation Based ◽  
Set Up ◽  
Vertical Jumps

By simplifying the triangular tracked engineer vehicle into dynamic model of half-tracked vehicle with five freedom degrees which includes four vertical jumps and one rotation, a corresponding dynamic differential equation is set up to each degree of freedom. A method of road roughness simulation, based on the time series of White Noise, is also represented and then verified. The simulation analysis of the tracked vehicle ride comfort is built on MATLAB/SIMULINK, based on the incentive signal of an imitated road. The simulation results show that the method that White Noise generated road roughness is applicable and prove efficient in the ride comfort research of the triangular tracked engineer vehicle. Thus a theoretical foundation is established for the optimization for ride comfort of the triangular tracked engineer vehicle.

The Time Domain Simulation of Non-Stationary Road Roughness

2013 ◽  
Vol 423-426 ◽  
pp. 1238-1242
Author(s):  
Hao Wang ◽  
Xiao Mei Shi
Keyword(s):  
Power Spectrum ◽  
Time Domain ◽  
Ride Comfort ◽  
Time History ◽  
Random Excitation ◽  
Power Spectrum Density ◽  
The Road ◽  
Road Roughness ◽  
Spectrum Density ◽  
History Of

The input of road roughness, which affects the ride comfort and the handling stability of vehicle, is the main excitation for the running vehicle. The time history of the road roughness was researched with the random phases, based on the stationary power spectrum density of the road roughness determined by the standards. Through the inverse Fourier transform, the random phases can be used to get the road roughness in time domain, together with the amplitude. Then, the time domain simulation of the non-stationary random excitation when the vehicle ran at the changing speed, would also be studied based on the random phases. It is proved that the random road excitation for the vehicle with the changing speed is stationary modulated evolution random excitation, and its power spectrum density is the stationary modulated evolutionary power spectrum density. And the numerical results for the time history of the non-stationary random inputs were also provided. The time history of the non-stationary random road can be used to evaluate the ride comfort of the vehicle which is running at the changing speed.

Fuzzy Control of Tracked Vehicle’s Semi-Active Suspension System Based on LMS

2014 ◽  
Vol 602-605 ◽  
pp. 1313-1316 ◽  
Author(s):  
Xiao Dong Gao ◽  
Liang Gu ◽  
Ji Fu Guan ◽  
Jun Feng Gao
Keyword(s):  
Adaptive Control ◽  
Control System ◽  
Ride Comfort ◽  
Fuzzy Controller ◽  
Active Suspension ◽  
Adaptive Control System ◽  
Vehicle Model ◽  
Tracked Vehicle ◽  
Change Rate ◽  
Set Up

A half tracked vehicle model was established based on LMS, a co-simulation interface between control algorithm of MATLAB and physical model of LMS was set up. Fuzzy controller with PID regulator was proposed to achieve controlling strategy based on half tracked vehicle model. With suspension stroke and its change rate as input parameters of fuzzy controller, the dynamic adjusting parameters of PID controller are acquired through fuzzy controller, then a semi-active suspension vehicle adaptive control system was formed. The simulation result shows that the adaptive control system can effectively coordinate the contradiction acceleration and dynamic travel in different bands, the ride comfort tracked vehicle is significantly improved.

Research on Running Ride Comfort of the Multifunctional Harvester

2013 ◽  
Vol 791-793 ◽  
pp. 795-798
Author(s):  
Qing Shu ◽  
Jie Zhu
Keyword(s):  
Structural Analysis ◽  
Ride Comfort ◽  
Simulation Analysis ◽  
Random Excitation ◽  
Road Surface ◽  
Pulse Excitation ◽  
Lagrange Method ◽  
Machine Model ◽  
Vibration Equation ◽  
Shock Mitigation

Based on the structural analysis of the multifunctional harvester, dynamical vibration equation with 5-degree of freedom is built by Lagrange method through rational simplification. Considering road surface random excitation drive and pulse excitation, simulation analysis of the running ride comfort is carried on to the complete machine model of vibration. Running ride comfort of the multifunctional harvester is predicted or evaluated, providing the basis for the design of adding the shock mitigation system to the multifunctional harvester.

Study on Ride Comfort of Non-Linear Vehicle Vibration System

2012 ◽  
Vol 215-216 ◽  
pp. 1043-1046
Author(s):  
Hai Yan Jing ◽  
Yan Ping Zheng ◽  
Ming Xia Fang
Keyword(s):  
Ride Comfort ◽  
Monotone Function ◽  
Random Excitation ◽  
Domain Model ◽  
Vehicle Body ◽  
Road Profile ◽  
Road Roughness ◽  
Non Linear ◽  
Rubber Bearings ◽  
The Mathematical Model

Based on the mathematical model of non-linear rubber bearings under the condition of random excitation and time domain model of road roughness, the 11-dof vibrant model for vehicle was built with considering the non-linear rubber bearings. Then the influence of the rubber bearings on ride comfort was simulated under the condition on the B-class road profile by different speed as the random input. The result shows that the way of modeling the vibrant model is feasible, and the influence is not a simple monotone function, especially in the barycenter acceleration of vehicle body.

scholarly journals Improvement of Ride Comfort Quality for an Earth-Moving machinery with Semi-Active Cab Isolation System

2021 ◽  
Vol 304 ◽  
pp. 02012
Author(s):  
Le Van Quynh ◽  
Dang Viet Ha ◽  
Bui Van Cuong ◽  
Le Anh Vu ◽  
Tran Van Thoan
Keyword(s):  
Ride Comfort ◽  
Low Frequency ◽  
Ground Surface ◽  
Interaction Model ◽  
Random Excitation ◽  
Vehicle Body ◽  
Potential Health ◽  
Isolation System ◽  
Comparison Results ◽  
Set Up

Improving ride comfort of earth-moving machinery is important to avoid potential health hazards for machine operator. A vehicle - road coupled interaction model including vehicle body, cab body and driver seat masses is set up under the random excitation of ground surface and a Fuzzy –PID controller is designed for control of the damping coefficient of a semi-active hydraulic cab isolation system (SHCIs) for an earth-moving machinery. The ride performance of SHCIs with a combined controller is evaluated under different movement conditions. The comparison results indicate that the proposed controller for semi-active cab hydraulic isolation system has the significantly improved vehicle ride comfort in compared with passive hydraulic cab isolation system (PHCIs) under large amplitude and low frequency excitations of ground surface.

Numerical Simulation Analysis on the Ten Cross Rolls Straightening Process of the Heavy Calibre Seamless Steel Tube

2011 ◽  
Vol 421 ◽  
pp. 56-59 ◽  
Author(s):  
Hua Gui Huang ◽  
Huan Ping Zheng ◽  
Feng Shan Du ◽  
Wen Zhang Wang
Keyword(s):  
Theoretical Foundation ◽  
Simulation Analysis ◽  
Element Model ◽  
Steel Tube ◽  
Seamless Tube ◽  
Seamless Steel Tube ◽  
Set Up ◽  
Nonlinear Finite Element Model ◽  
Machine Structure ◽  
Seamless Steel

The size and roundness tolerance are common defects of the heavy caliber seamless tube after rolling and heat treatment. In order to disclosure the straightening mechanism of the heavy caliber seamless tube with ten cross rollers straightening machine, a nonlinear finite element model was set up on the platform of MSC.MARC. In this model, a heavy caliber seamless tube of Φ750 × 37 mm with initial roundness tolerance was used. The simulation results show that, the roundness tolerance declined from 1% to 0.2% after straightening, so that the initial roundness tolerance was almost eliminated. And the strain and stress distribution of the tube, the straightening force fluctuating caused by the roundness tolerance were presented and discussed. The analysis results obtained may provide a theoretical foundation not only for establishing the straightening process, but for the machine structure designing.

The Reduction of Bias Error in Transfer Function Estimates Using FFT-Based Analyzers

1984 ◽  
Vol 106 (1) ◽  
pp. 29-35 ◽  
Author(s):  
P. Cawley
Keyword(s):  
Transfer Function ◽  
Random Excitation ◽  
Analogue Computer ◽  
Bias Error ◽  
Testing Time ◽  
Theoretical Predictions ◽  
Set Up ◽  
Modal Mass ◽  
Time Required ◽  
Good Agreement

The susceptibility to bias error of two methods for computing transfer (frequency response) functions from spectra produced by FFT-based analyzers using random excitation has been investigated. Results from tests with an FFT analyzer on a single degree-of-freedom system set up on an analogue computer show good agreement with the theoretical predictions. It has been shown that, around resonance, the bias error in the transfer function estimate H2 (Syy/Sxy*) is considerably less than that in the more commonly used estimate, H1 (Sxy/Sxx). The record length, and hence the testing time, required for a given accuracy is reduced by over 50 percent if the H2 calculation procedure is used. The analysis has also shown that if shaker excitation is used on lightly damped structures with low modal mass, it is important to minimize the mass of the force gage and the moving element of the shaker.

The Research and Simulation Analysis of a New Type of Translational Transmission Device

2014 ◽  
Vol 556-562 ◽  
pp. 1408-1412
Author(s):  
Zhi Qiang Zhang
Keyword(s):  
Modeling And Simulation ◽  
Theoretical Foundation ◽  
Simulation Analysis ◽  
Structural Modeling ◽  
Structural Features ◽  
Practical Application ◽  
Optimization Analysis ◽  
New Type ◽  
Mechanism Parameter ◽  
Relationship Of

In this paper, the following work is done: a new type of translational transmission device is designed; explained in detail are the operating principle, structural features, relationship of mechanism parameter and non interference conditions of the movement; the optimization analysis of transmission device is implemented on the basis of non interference conditions of the bucket movement; structural modeling and simulation analysis are carried out by utilization of Pro/e & Recurdyn; and based on virtual prototype technology, the new type of translational transmission device is verified by experiments, the data of which prove the translational transmission device reasonable and practicable. In conclusion, this paper has laid the theoretical foundation of the practical application of the translational transmission device.

Simulation Analysis of Electro-Pneumatic Proportional Fuzzy-PID Control System Based on AMESim/Simulink

2014 ◽  
Vol 945-949 ◽  
pp. 2568-2572
Author(s):  
Si Yuan Wang ◽  
Guang Sheng Ren ◽  
Pan Nie
Keyword(s):  
Control System ◽  
Pid Control ◽  
Pid Controller ◽  
Simulation Analysis ◽  
Fuzzy Pid ◽  
Fuzzy Pid Control ◽  
Proportional Control ◽  
Fuzzy Pid Controller ◽  
Design Requirements ◽  
Set Up

The test rig for hydro-pneumatic converter used in straddle type monorail vehicles was researched, and its electro-pneumatic proportional control system was set up and simulated based on AMESim/Simulink. Compared fuzzy-PID (Proportion Integral Derivative) controller with PID controller through fuzzy logic tool box in Simulink, the results indicate that, this electro-pneumatic proportional control system can meet design requirements better, and fuzzy-PID controller has higher accuracy and stability than PID controller.

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