The influence of magnetorheological dampers on the biodynamic response of the human (pilot) body in various flight maneuvers

Document Type : Full Length Article


1 Department of Aerospace Engineering, Shahid Sattari Aeronautical University of Science and Technology, Tehran, Iran

2 Department of Mechanical Engineering, Graduate University of Advanced Technology, Kerman, Iran



This paper presents the effect of a magnetorheological (MR) damper in the aircraft seat system on the body's biodynamic response for different flight maneuvers. For this purpose, discrete models 4 and 7 degrees of freedom for human modeling and the Bouc-Wen model are used to model MR damper. In various flight maneuvers, the changes in acceleration g are recorded and applied to the desired models after processing. Models used for the human body and the MR damper are compared for validation with previously published researches. The dynamic responses of the human body to these inputs without MR dampers and with an MR damper are investigated. The transmissibility[1] of the seat to the human body is used as a parameter that is common in these types of analyses. The results show that the use of MR dampers has a significant effect on reducing the transmissibility in maneuvers with a sudden increase in acceleration and also significant changes in the frequency at which maximum transmissibility is achieved.


  • The effect of the magnetic damper is considered on the aircraft pilot's seat.
  • The biodynamical characteristics of the pilot body are modelled using discrete models.
  • Changes in acceleration as input are recorded by real flight maneuvers.
  • Biodynamic analysis is performed by calculating the transmissibility to the pilot's body.
  • The most vulnerable members of the pilot's body are evaluated.


Main Subjects

[1] D.F. Shanahan, G. Mastroiane, T.D. Reading, Back discomfort in US Army military helicopter aircrew member, Backache and back discomfort, (1986) 10-25.
[2] K.L. Harrer, D. Yniguez, M. Majar, D. Ellenbecker, N. Estrada, M. Geiger, Whole body vibration exposure for MH-60s pilots, in, NAVAL MEDICAL CENTER SAN DIEGO CA, 2005.
[3] A.-G. Olabi, A. Grunwald, Design and application of magneto-rheological fluid, Materials & design, 28 (2007) 2658-2664.
[4] A.N. Kulkarni, S.R. Patil, Magneto-Rheological (MR) and Electro-Rheological (ER) Fluid Damper: A Review Parametric Study of Fluid Behavior.
[5] M. Lita, N.C. Popa, C. Velescu, L.N. Vekas, Investigations of a magnetorheological fluid damper, IEEE Transactions on Magnetics, 40 (2004) 469-472.
[6] D.H. Wang, W.H. Liao, Modeling and control of magnetorheological fluid dampers using neural networks, Smart materials and structures, 14 (2004) 111.
[7] J.D. Carlson, Implementation of semi-active control using magneto-rheological fluids, IFAC Proceedings Volumes, 33 (2000) 905-910.
[8] M. Orečný, Š. Segľa, R. Huňady, Ž. Ferková, Application of a magneto-rheological damper and a dynamic absorber for a suspension of a working machine seat, Procedia Engineering, 96 (2014) 338-344.
[9] S.-B. Choi, M.-H. Nam, B.-K. Lee, Vibration control of a MR seat damper for commercial vehicles, Journal of Intelligent Material Systems and Structures, 11 (2000) 936-944.
[10] Y.-T. Choi, N.M. Wereley, Biodynamic response mitigation to shock loads using magnetorheological helicopter crew seat suspensions, Journal of aircraft, 42 (2005) 1288-1295.
[11] G.J. Hiemenz, W. Hu, N.M. Wereley, Semi-active magnetorheological helicopter crew seat suspension for vibration isolation, Journal of Aircraft, 45 (2008) 945-953.
[12] S. Kitazaki, M.J. Griffin, A modal analysis of whole-body vertical vibration, using a finite element model of the human body, Journal of Sound and Vibration, 200 (1997) 83-103.
[13] N.J. Mansfield, Human response to vibration, CRC press, 2004.
[14] Y. Matsumoto, M.J. Griffin, Modelling the dynamic mechanisms associated with the principal resonance of the seated human body, Clinical Biomechanics, 16 (2001) S31-S44.
[15] L.A. Wood, C.W. Suggs, C.F. Abrams Jr, Hand-arm vibration part III: A distributed parameter dynamic model of the human hand-arm system, Journal of Sound and Vibration, 57 (1978) 157-169.
[16] C.M. Harris, A.G. Piersol, Harris' shock and vibration handbook, McGraw-Hill New York, 2002.
[17] T.E. Coe, J.T. Xing, R.A. Shenoi, D. Taunton, A simplified 3-D human body–seat interaction model and its applications to the vibration isolation design of high-speed marine craft, Ocean engineering, 36 (2009) 732-746.
[18] M.R. Sirouspour, S.E. Salcudean, Suppressing operator-induced oscillations in manual control systems with movable bases, IEEE Transactions on Control Systems Technology, 11 (2003) 448-459.
[19] M.K. Patil, M.S. Palanichamy, A mathematical model of tractor-occupant system with a new seat suspension for minimization of vibration response, Applied Mathematical Modelling, 12 (1988) 63-71.
[20] W. Abbas, O.B. Abouelatta, M. El-Azab, M. Elsaidy, A.A. Megahed, Optimization of biodynamic seated human models using genetic algorithms, Engineering, 2 (2010) 710.
[21] N. Wilson, N. Wereley, Analysis of a magnetorheological fluid damper incorporating temperature dependence, in:  51st AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference 18th AIAA/ASME/AHS Adaptive Structures Conference 12th, 2010, pp. 2993.
[22] M. Braz-César, R. Barros, Experimental behaviour and numerical analysis of MR dampers, 15WCEE-15th World Conference on Earthquake Engineering, in, Portugal, 2012.
[23] A. Martins, A. Fereidooni, A. Suleman, V.K. Wickramasinghe, Test rig development and characterization of magnetorheological elastomers, in:  25th AIAA/AHS Adaptive Structures Conference, 2017, pp. 0733.
[24] R.L. Shaw, Fighter combat: tactics and maneuvers, in, Annapolis, Maryland: Naval Institute Press, 1988.