International Journal of Vehicle Structures and Systems

Open Access Open Access  Restricted Access Subscription Access

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


Affiliations
1 Koneru Lakshmaiah Education Foundation, Vaddeswaram, Guntur, Andhra Pradesh, India
2 Dept. of Mech. Engg., Koneru Lakshmaiah Education Foundation, Vaddeswaram, Guntur, Andhra Pradesh, India
3 Dept. of Mech. Engg., University College of Engg., JNTUK University, Kakinada, Andhra Pradesh, India
 

   Subscribe/Renew Journal


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.

Keywords

Magneto Rheological Dampers, Quarter Car Model, Suspension Systems, Spencer Model, Human Body Vibrations.
User
Subscription Login to verify subscription
Notifications
Font Size

  • D. Ryba. 1974. Improvements in dynamic characteristics of automobile suspension systems: Part 1 - Two-mass systems, Vehicle System Dynamics, 3(1), 17-46. https://doi.org/10.1080/00423117408968445.

  • R. Rajalakshmi, S.R. Kumar, J. Thiyagarajan and A. Vinothkumar. 2017. Evaluation of human exposure to vibration subjected to active suspension actuators, Int. J. Vehicle Structures & Systems, 9(2), 68-71. https://doi.org/10.4273/ijvss.9.2.01.

  • J. Wang and G. Meng. 2001. Magneto rheological fluid devices: principles, characteristics and applications in mechanical engineering, Proc. IMechE J. Materials: Design & Applications, 215(3), 165-174.

  • R. Turczyn and M. Kciuk. 2008. Preparation and study of model Magneto rheological fluids, J. Achievements in Materials and Manuf. Engg., 27(2), 131-134.

  • M. Jolly, J.W. Bender and J.D. Carlson. 1998. Properties and applications of commercial magneto rheological fluids, Proc. SPIE 5th Annual Int. Symposium Smart Structures and Materials, San Diego.

  • B.F. Spencer, S. Dyke, M. Sain, and J. Carlson. 1997. Phenomenological model for magneto rheological dampers, ASCE J. Engg. Mech., 1-23.

  • V.K. Grag and R.V. Dukkipati. 1984. Dynamics of Railway Vehicle Systems, Academic Press Inc.

  • B. Sapiński and J. Filus. 2003. Analysis of parametric models of MR linear damper, J. Theoretical and Applied Mechanics, 41(2), 215-240.


Abstract Views: 362

PDF Views: 179




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

Abstract Views: 362  |  PDF Views: 179

Authors

D. V. A. Rama Sastry
Koneru Lakshmaiah Education Foundation, Vaddeswaram, Guntur, Andhra Pradesh, India
K. V. Ramana
Dept. of Mech. Engg., Koneru Lakshmaiah Education Foundation, Vaddeswaram, Guntur, Andhra Pradesh, India
N. Mohan Rao
Dept. of Mech. Engg., University College of Engg., JNTUK University, Kakinada, Andhra Pradesh, India
M. Phani Kumar
Dept. of Mech. Engg., Koneru Lakshmaiah Education Foundation, Vaddeswaram, Guntur, Andhra Pradesh, India
V. S. S. Rama Chandra Reddy
Dept. of Mech. Engg., Koneru Lakshmaiah Education Foundation, Vaddeswaram, Guntur, Andhra Pradesh, India

Abstract


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.

Keywords


Magneto Rheological Dampers, Quarter Car Model, Suspension Systems, Spencer Model, Human Body Vibrations.

References





DOI: https://doi.org/10.4273/ijvss.10.4.08