The research on cyclists knee and hip forces at different saddle heights

摘要

At present, the design and research bicycle mainly focus on optimizing the structure, few studies on cyclist biomechanics. As the most important part, human body, in a human-bicycle system, the study on cyclist biomechanics has extremely important significance for bicycle design. Depending on the saddle's height measurement parameters: the different maximal knee joint angle ranging from 120° to 150° during riding, the paper researched the cyclists knee and hip forces at different saddle heights using modern technology. We firstly collected the dynamic information of different pose movements utilizing LUKOTRONIC motion capture system in cycling test. Then according to human physical parameters of a cyclist, we established an analogical model in LifeMOD as well as a dynamical model of the bicycle in PRO/E and ADAMS unite-modeling using the parameters based on the movement data. Dynamics simulation of the inverse and forward was finally performed. The results show that the forces of knee and hip joint are smallest, respectively, when the maximal knee joint angle riding at the height is 130°, and the angle may be appropriate saddle height for other cyclists, and could be the comfortable posture when riding.