Study on Mechanics of a System Consisting of Ski. Bining, Boots and Skier

1. 为了快速测量滑雪板的弯曲刚度和扭转刚度，研制了测量仪器。选取结构、制造工艺、材料、尺寸各不相同的4种滑雪板，对其质量分布进行了研究。它们被切成小块，然后测量每块的质量。实验结果表明，各部分单位长度质量与滑雪板单位长度质量之比沿纵向变化规律相似，与滑雪板的种类无关。因此，人们可以根据滑雪板的整体质量和长度简单地估计出每个部分的质量。其次，采用实验模态分析方法测量了滑板的阻尼比和固有频率。由于测量了43种滑雪板，因此认为本研究大致明确了市场上销售的滑雪板的阻尼比。此外，还测量了各小部件的抗弯刚度和抗扭刚度。由于小零件的弯曲刚度和扭转刚度的测量比较困难，它们的分布尚未公布。研究中得到的实验结果被认为是有价值的。通过对绑扎靴生产企业的走访，对绑扎靴的种类、材料、力学性能、测量仪器、标准等进行了研究。由此可见，绑带的释放性能和靴靴的力学性能对模拟滑雪运动具有重要意义。

1. Development of measuring apparatus Apparatuses were developed for measuring rapidly the flexural rigidity and tortional rigidity of a ski.2. Mechanical properties of a ski Four kinds of ski, of which structure, manufacturing process, material and size are different from each other, were chosen for investigating the distribution of mass of the ski. They were cut into small parts and the mass of each part was measured. Experimental results showed that the ratio of the mass per unit length of each part to the mass per unit length of the ski varies in the similar manner along the longitudinal direction with no relation to the kind of ski. Accordingly, one can estimate simply the mass of each part from the whole mass and length of the ski. Next, the damping ratio and natural frequency of ski were measured by using the experimental modal analysis. Since 43 kinds of ski were measured, it is considered that the damping ratio of the ski sold in markets is roughly made clear in this study. Furthermore, the flexural rigidity and torsional rigidity of each small part were measured. Since the measurement of flexural rigidity and torsional rigidity of small parts was difficult, the distribution of them has not been published at yet. Experimental results obtained in the study are considered to be vary valuable.3. Research on binding and boots By visiting to the companies of binding and boots, research was carried out on kind, material, mechanical properties, its measuring apparatus and standards of binding and boots. It follows that the releasing property of the binding and the mechanical properties of boots are important for the simulation of skiing.