This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Analysis of Straight Running Stability of Motorcycles
Technical Paper
856124
Annotation ability available
Sector:
Language:
English
Abstract
In this paper, straight running stability without controlling behavior of the rider is analyzed with regard to a mathematical model of 12 degrees of freedom. This model has 2 degrees of freedom concerning leaning movement of upper body and lateral movement of lower body of the rider as well as 4 degrees of freedom of sideslip, yawing, rolling of motorcycle, and rotation of steering handlebar, and 6 degrees of freedom of frame rigidities.
Vibration characteristics of the rider's body influence both weave and wobble modes. Theoretical calculation results by using a mathematical model of 12 degrees of freedom are relatively and qualitatively similar to the results obtained by full-scale running experiments. The extent of quantitative coincidence between theory and experiment, however, varies with types of motorcycles. Parameters concerning vibration characteristics of rider's upper body influence weave mode, and those of rider's lower body influence mainly wobble mode.
Recommended Content
| Technical Paper | Ride Comfort Aspects of Heavy Truck Design |
| Technical Paper | Analysis of Vibrational Modes of Vehicle Steering Mechanisms |
| Technical Paper | Development of a Robot that Simulates Motor cycle Driving Operation for Running Test |
Authors
Citation
Nishimi, T., Aoki, A., and Katayama, T., "Analysis of Straight Running Stability of Motorcycles," SAE Technical Paper 856124, 1985.Also In
References
- Sharp, R.S. “The stability and control of motorcycles.” J. Mech. Engr. Science 13 5 316 329 1971
- Sharp, R.S. Alstead C.J. “The influence of structural flexibilities on the straight-running stability of motorcycles,” Vehicle System Dynamics 9 327 357 1980
- Spierings, P.T.J. “The effects of lateral front fork flexibility on the vibrational modes of straight-running single-track vehicles,” Vehicle Sysiem Dynamics 10 21 35 1981
- Koch, J. “Experimentelle und Analytische Untersuchungen des Motorrad-Fahrer-Systems,” VDI Zeitschriften 1980-5
- Koenen, C. Pacejka H.B. “The influence of frame elasticity, simple rider body dynamics and tyre moments of free vibrations of motorcycles in curves,” Proceedings 7th IAVSD-Symposium Cambridge University Cambridge, United Kingdom 53 64 September 7-11 1981
- Mochizuki, T. “Electric hydraulic vibration testing machines,” Journal of JARI 1 6 196 197 1979
- Chandler, R.F. Clauser G.E. McConville J. T, Reynolds H.M. Young J.W. “Investigation of inertial properties of the human body,” U.S. Department of Transportation HS-801430 1975
- Aoki, A. Motomiya S. Sato K. “Inertial properties of motorcycles,” JARI TM 62 1977
- Aoki, A. Motomiya S. Sato K. “Aerodynamic characteristics of motorcycles,” JARI TM 63 1977
- Aoki, A. Nishimi T. Sato K. “Dynamic steering characteristics of motorcycle tires,” Journal of JARI 2 6 167 171 1980
- Study Report on Motorcycle Dynamics, JAMA Report, prepared by JARI under the auspices of JAMA, 1979-7, 1981-5 1982-9
- Study Report on Handling and Stability of Motorcycle. JAMA Report, prepared by JARI under the auspices of JAMA, 1983-7 1985-1
- Aoki, A. “Experimental study on motorcycle steering performance,” SAE Transactions 88 946 961 1979