The Analysis Of Mountain Bike Dynamic Character On Riding

In this paper the computer programming realization of the Cartesian mathematical model and algorithm is discussed in the area of computational dynamics of multibody systems with holonomic constrains in two-dimension space, a testing and some theoretic analysis is developed for obtaining the mountain bike (MTB) dynamic character on riding. A full road-MTB-rider system is built with the software for dynamic analysis of multibody systems and the computer advanced programming language. The evaluation of the MTB's riding dynamic character is made using the road-MTB-rider system model.In the process of realizing the program, the Cartesian mathematical model and algorithm is analyzed systemically and the knowledge of the software engineering and Unified Modeling Language (UML) are also been utilized. Base upon this analysis, the structure of the dynamic analysis program aimed at the planar problem with holonomic constrains is designed, the primary functional object of kinematical and kinetic analysis is achieved, two typical problem is chose for validating the correctness of this dynamic analysis program. The research in this dynamic analysis program's realization explores the way of developing the real dynamic analysis software which could be used for analyzing the MTB's riding dynamic character.Concerning of the MTB's riding dynamic character analysis a vibration testing is designed and developed, which is base upon the national standard about bicycle testing and the tested object is the frame of one typical full suspension MTB. Then a simulated testing system is built by ADAMS (Automatic Dynamic Analysis of Mechanical System), which is based upon the Cartesian mathematical model and algorithm. And the testing is being simulated. By comparing with the results of the testing and simulation, the application condition of the simulated frame model is found and the reliability of the model is confirmed. Base upon the frame model is validated, it is modified and a road-MTB-rider system model is built. This system includes: the road roughness model according to the specification GB7031-87 built by two methods which are the harmonic accumulation model and ARMA(Auto-Regressive Moving Average)model; The multi-rigid-body dynamic model of MTB; The rider's model composed of mechanical model and perception model referencing ISO2631 used for evaluating comfort of human exposed to the whole-body vibration. At the end of this paper the dynamic riding character of the road-MTB-rider is analyzed. The evaluation of the dynamic riding character for the bicycle is given. The result shows the dynamic riding character of this tested MTB is unsatisfied, the design should be improved. As a summary, this paper builds a full road-MTB-rider system model could be used as a basic model in the future's research, and an easily operational standard for evaluation the dynamic riding character of MTB is developed and could be used in the Computer Aided Design(CAD) of MTB.