Improvement of Dynamic Wheel Load Oscillations by Coupling Pitch Motion into Bounce Motion during Pitching Motion of Passenger Vehicle

Öz

The aim of this study is to determine the oscillation center position change that can reduce the dynamic wheel load oscillations during the pitching motion. For this purpose, the pitch and heave motions were coupled to each other during the pitch motion by changing the positions of the pitch and heave oscillation centers according to each other. The degree of coupling is determined by the front and rear spring stiffness. For this, the half-vehicle model that can be coupled to the two-quarter vehicle model with the suspension components were used. With this model, the effects of coupling on dynamic wheel load oscillations were examined in frequency domain according to the location of the center of gravity and vehicle speed. The results showed that the position changes of the oscillation centers can reduce both the front and rear dynamic wheel load oscillations, and this will be slightly affected by vehicle speed variation. It has also been found that this improvement depends on how the damping level of the shock absorber on a wheel will vary with respect to the change in the suspension spring.

Anahtar Kelimeler

• Suspension system
• coupling effect
• oscillation center
• pitch and bounce motion
• dynamic wheel load

Kaynakça

1. 1. Cao, D., Song, X. and Ahmadian, M., “Editors' perspectives: road vehicle suspension design, dynamics, and control”, Vehicle System Dynamics, 49(1): 3 -28, (2011).
2. 2. Sharp, R.S., “Road Vehicle Suspension System Design-A Review”, Vehicle System Dynamics, 16: 167- 192, (1987).
3. 3. Güney, A., “The vibration and noise in vehicles: lecture notes”, Istanbul Technical University, (2002).
4. 4. Sun, T., Zhang. Y., Barak. P., “4-DOF vehicle ride model”, SAE Paper, 2002-01-1580, (2002).
5. 5. Milliken, F.W. and Milliken, D.L.,”Chasis Design Principle and Analysis”, Society of Automotive Engineers, USA, (2002).
6. 6. Crolla, D.A. and King, R.P., “Olley’s flat ride revisited”, Vehicle System Dynamics, Supp. 33: 762–774, (1999).
7. 7. Olley, M., “Independent wheel suspension—its whys and wherefores”, SAE Transactions, 29: 73–81, (1934).
8. 8. Wong, J.Y.,“Theory of ground vehicles”, second edition, John Wiley & Sons, (1993).

9. 9. Sharp R.S. and Pilbeam, C., “Achievability and value of passive suspension designs for minimum pitch response”, In: ImechE International Conference–Vehicle Ride and Handling, Birmingham, 15–17, (1993).
10. 10. Smith, W.A and Nong, Z., ”Recent developments in passive interconnected vehicle suspension”, Front. Mech. Eng. 5(1): 1–18. (2010).
11. 11. Genta, G., “Motor Vehicle Dynamics”, World Scientific, USA, (1992).
12. 12. Gillespie, T.D., “Fundamentals of Vehicle Dynamics”, Society of Automotive Engineers, USA, (1992).
13. 13. Mitschke, M., “Dynamik Der Kraftfahrzeuge Band B: Schwingungen”, Springer Verlag, Berlin, Germany, (1997).
14. 14. Xu, G., “Investigation to the Ride and Handling of Vehicle with Interconnected Suspensions”, Doctoral Thesis, University of Technology, Sydney, (2016).
15. 15. Nagai, M and Hasegawa, T.. “Vibration isolation analysis and semi-active control of vehicles with connected front and rear suspension dampers”, JSAE Review, 18: 45-50, (1997).
16. 16. Dixon, J.C., “The Shock Absorber Handbook”, Second Edition, John Wiley & Sons, England, (2007).
17. 17. Cao, D., Rakheja, S., Su, C.Y., “Heavy vehicle pitch dynamics and suspension tuning. Part I: unconnected suspension”, Vehicle System Dynamics, 46(10): 931 – 953, (2008).
18. 18. Sharp, R.S., “Wheelbase filtering and automobile suspension tuning for minimizing motions in pitch”, Proceedings of the institution of mechanical engineers, Part D: J. Automobile Engineering, 216: 933-946, (2002).
19. 19. Cao, D., Khajepour, A., Song, X., “Wheelbase Filtering and Characterization of Road Profiles for Vehicle Dynamics”, 12th AMSE International Conference on Advanced Vehicle and Tire Technologies, Montreal, Canada, (2010).
20. 20. Xu, G., Zhang, N., Roser, H.M., “Roll and pitch independently tuned interconnected suspension: modelling and dynamic analysis”, Vehicle System Dynamics, 53:12, 1830-1849, (2015).
21. 21. Zhang, J., Deng, Y., Zhang, N., Zhang, B., Qi, Hengmin, Zheng, M., Vibration Performance Analysis of a Mining Vehicle with Bounce and Pitch Tuned Hydraulically Interconnected Suspension”, Chin. J. Mech. Eng, 32:5, (2019).
22. 22. Sharp, R.S., “Influences of suspension kinematics on pitching dynamics of cars in longitudinal maneuvering”, Vehicle System Dynamics, Suppl. 33: 23–36, (1999).
23. 23. Odhams, A.M.C. and Cebon, D., “An analysis of ride coupling in automobile suspensions”, Proceedings of the institution of mechanical engineers, Part D: J. Automobile Engineering, 220: 1041–1061, (2006).