scholarly journals Vibration transmission simulation model of a seated vehicle passenger

2021 ◽  
Vol 2120 (1) ◽  
pp. 012009
Author(s):  
I Ho ◽  
N Z Abu Bakar
Keyword(s):  
Simulation Model ◽  
Human Body ◽  
Ride Comfort ◽  
Real Life ◽  
Vertical Vibration ◽  
Suspension System ◽  
Human Body Model ◽  
Peak Displacement ◽  
Moving Vehicle ◽  
Vibration Simulation

Abstract The paper presents development of vertical vibration simulation for a seated passenger in a moving vehicle is resulting from the bounce effect of the vehicle under various conditions. Although extensive research has been conducted in this field of study, the existing analysis were conducted on either the suspension of vehicle or the human body and not both. In this paper, the simulation model consists of three sub-systems, namely, vehicle suspension, seat suspension and human body model in which the vertical vibration is transmitted. By incorporating these sub-systems into the simulation, a correlation between mechanical and biological aspects can be formed between the three sub-systems. The transmission of vertical vibration in the validated simulation model provides a more realistic approach which can result to a better comparison to the real-life scenario. Parametric analysis of passive suspension system shows that lower mass ratio, higher stiffness ratio and lower damping coefficient results in better ride comfort. The incorporation of variable damper into the suspension system shows significant improvement in settling time, peak displacement and velocity, lesser discomfort rating and higher safety in passenger body.

425 Development of New Human Body Model Enable to Estimate Ride Comfort

2012 ◽  
Vol 2012 (0) ◽  
pp. _425-1_-_425-9_
Author(s):  
Shuji NISHIYAMA ◽  
Shinichiro OTA ◽  
Hiroyuki KITAKAZE ◽  
Sizuo SUMIDA
Keyword(s):  
Human Body ◽  
Ride Comfort ◽  
Human Body Model ◽  
Body Model

Simulation Analysis of Motor Vehicle Ride Comfort Based on Adams

2012 ◽  
Vol 224 ◽  
pp. 243-247
Author(s):  
Cai Bin Li ◽  
Fu Yun Liu ◽  
Ju Cai Deng
Keyword(s):  
Simulation Model ◽  
Motor Vehicle ◽  
Ride Comfort ◽  
Simulation Analysis ◽  
Simulation Method ◽  
Damping Force ◽  
Vibration Experiment ◽  
Heavy Truck ◽  
Vibration Simulation ◽  
Stiffness And Damping

Applying ADAMS to vibration control field of heavy truck. The vibration simulation model of a truck is established. With the simulation model, different acceleration responses under different suspension stiffness and damping force are simulated. The simulation result is close to the actual result. It shows that the simulation method is benefit to reduce the number of vibration experiment and to forecast the vibration response of heavy truck.

Vibration Simulation Model of Passenger-Wheelchair System in Wheelchair-Accessible Vehicle

2003 ◽  
Vol 125 (4) ◽  
pp. 779-785 ◽  
Author(s):  
Yoshiyuki Matsuoka ◽  
Kohei Kawai ◽  
Ryo Sato
Keyword(s):  
Simulation Model ◽  
Subjective Evaluation ◽  
Rear Wheel ◽  
Suspension System ◽  
Prediction System ◽  
Unknown Parameters ◽  
Vibration Transmission ◽  
Comfort Evaluation ◽  
Floor Vibration ◽  
Vibration Simulation

A model that simulates vibration transmission to a wheelchair-bound passenger riding in a wheelchair-accessible vehicle was developed and tested. The model is a component of a comfort evaluation prediction system, which is used to predict the passenger’s subjective evaluation of discomfort caused by floor vibration. A model of a wheelchair-bound passenger was used to estimate unknown parameters. A simulation using the model to predict the effect of adding a suspension system to the rear-wheel assembly of the wheelchair demonstrated the applicability of the model.

scholarly journals Evaluating car's ride comfort and controlling vibration of suspension system based on adaptive PID control

2021 ◽  
Vol 1 (1) ◽  
pp. 1-9
Author(s):  
Zongwei Li ◽  
◽  
Vanliem Nguyen ◽  
Keyword(s):  
Root Mean Square ◽  
Pid Control ◽  
Ride Comfort ◽  
Vertical Vibration ◽  
Suspension System ◽  
Operating Conditions ◽  
Road Surface ◽  
Vehicle Body ◽  
Mean Square ◽  
Adaptive Pid Control

The vertical vibration of the vehicles not only affects the durability of parts of the vehicle and road surface but it also affects the driver’s ride comfort and health. The aim of this study is to evaluate the effect of the vertical vibration on the driver’s ride comfort and health under the vehicle different operating conditions. The adaptive PID control is then applied to improve the vehicle's ride comfort. To achieve this goal, a 2D vibration model for the cars with 5 DOF is established to simulate. The different operating conditions of the speed, road surface, load, and working time of the vehicles are respectively evaluated based on the vertical weighted r.m.s. acceleration responses of the driver’s seat and the international standard ISO 2631. The results show that the road surface condition has the greatest influence on the driver’s comfort and health. With the vehicle's suspension system controlled by the adaptive PID controller, the ride comfort of the vehicle is significantly improved under the various road surfaces. Particularly, at ISO level B, the vertical driver's seat root-mean-square acceleration value is greatly reduced by 24.99 % while the pitching vehicle body root-mean-square acceleration value is decreased by 25.10 % in comparison with the passive suspension system.

Integrated Design for Steering System and Suspension

2014 ◽  
Vol 494-495 ◽  
pp. 159-162
Author(s):  
En Guo Dong ◽  
Lei Zhang ◽  
Li Xue Liang
Keyword(s):  
Simulation Model ◽  
Ride Comfort ◽  
Control Method ◽  
Design Method ◽  
Integrated Control ◽  
Integrated Design ◽  
Steering System ◽  
Suspension System ◽  
Vertical Acceleration ◽  
Integrated Simulation

A design method of integrated control for suspension system and steering system is proposed based on vehicle ride comfort and handling stability. A car simulation model is built applying the software of MATLAB and ADAMS. The construction and characteristic of the integrated simulation model of the suspension system and steering system is illustrated in detail which uses fuzzy method and PID method. Using the simulation model, body vertical acceleration, roll angle and yaw angular velocity are measured in three status which include no control condition, the individually control for active suspension, and the integration control respectively. The simulation data show that the integrated control method synchronously ensures the ride comfort and handling stability.

SLIDING MODE CONTROL OF ER SEAT SUSPENSION CONSIDERING HUMAN VIBRATION MODEL

2005 ◽  
Vol 19 (07n09) ◽  
pp. 1689-1695 ◽  
Author(s):  
Y. M. HAN ◽  
J. Y. JUNG ◽  
S. B. CHOI ◽  
N. M. WERELEY
Keyword(s):  
Human Body ◽  
Sliding Mode ◽  
Suspension System ◽  
Driver Model ◽  
Ride Quality ◽  
Human Body Model ◽  
Parameter Uncertainties ◽  
Damping Force ◽  
Seat Suspension ◽  
Vibration Model

This paper presents robust control performances of a semi-active electro-rheological (ER) seat suspension incorporating vibration model of human-body. A cylindrical type of ER seat damper is manufactured for a commercial vehicle seat suspension system and its field-dependent damping force is experimentally evaluated. A human-body model is then derived and integrated with the governing equations of the ER seat suspension system. The integrated seat-driver model featured by a high order degree-of-freedom (DOF) is reduced through a balanced model reduction to design robust controller. By imposing semi-active actuating conditions, a sliding mode controller which is very robust to external disturbances and parameter uncertainties is synthesized and experimentally realized with the state observer. In the experimental configuration, a driver directly sits on the controlled seat. Control results for ride quality considering response of each human body segment are evaluated in both time and frequency domains. In addition, a comparison of the proposed semi-active ER seat suspension to a conventional passive seat suspension system is undertaken.

Evaluation of Human Exposure to Vibrations using Quarter Car Model with Semi-Active Suspension

2018 ◽  
Vol 10 (4) ◽  
Author(s):  
D.V.A. Rama Sastry ◽  
K.V. Ramana ◽  
N. Mohan Rao ◽  
M. Phani Kumar ◽  
V.S.S. Rama Chandra Reddy
Keyword(s):  
Human Body ◽  
Ride Comfort ◽  
Mr Damper ◽  
Active Suspension ◽  
Suspension System ◽  
Lumped Mass ◽  
Passive Suspension ◽  
Quarter Car Model ◽  
Car Model ◽  
Quarter Car

Exposure of human body to vehicular vibrations in transit may lead to the human discomfort. Ride comfort is one of the major issues in design of automobiles. Magneto rheological (MR) dampers are emerging as most feasible solution for various applications in controlling vibrations. An MR damper is a semi-active device, which will offer the advantages of both active and passive suspension. In this study, the MR damper based semi-active suspension system for a car is analysed for ride comfort of 7 degrees of freedom model human body lumped mass, considering head, upper torso, lower torso and pelvis, seated over a seat of a quarter car model and is compared with that of similar system using passive damper. A MR damper is fabricated and is filled with MR fluid made of Carbonyl iron powder and Silicone oil added with additive. Modified Bouc-Wen Model developed by Spencer is used to model the behaviour of MR damper. All the parameters of this model are identified using data acquired from experiments conducted to characterise MR damper. Further, using the Spencer model of MR damper, the human body seated over quarter car is simulated by implementing a semi-active suspension system for analysing the resulting displacement and acceleration of the human body. The ride comfort performance of vehicle model with passive suspension system is compared with corresponding semi-active suspension system. The simulation and analysis are carried out using MATLAB/SIMULINK.

scholarly journals Methodology for Selecting the Operating Conditions of a Vibration Generator Used in the Hot-Dip Galvanizing Process

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2042
Author(s):  
Wojciech Kacalak ◽  
Igor Maciejewski ◽  
Dariusz Lipiński ◽  
Błażej Bałasz
Keyword(s):  
Simulation Model ◽  
Asynchronous Motor ◽  
Experimental Tests ◽  
Suspension System ◽  
Operating Conditions ◽  
Test Results ◽  
Forced Simulation

A simulation model and the results of experimental tests of a vibration generator in applications for the hot-dip galvanizing process are presented. The parameters of the work of the asynchronous motor forcing the system vibrations were determined, as well as the degree of unbalance enabling the vibrations of galvanized elements weighing up to 500 kg to be forced. Simulation and experimental tests of the designed and then constructed vibration generator were carried out at different intensities of the unbalanced rotating mass of the motor. Based on the obtained test results, the generator operating conditions were determined at which the highest values of the amplitude of vibrations transmitted through the suspension system to the galvanized elements were obtained.

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