排球球缝随机气动力辨识建模

本文应用Ｈ（Ｈｏｕｓｅｈｏｌｄｅｒ）变换求解病态法方程之最小二乘法及三次样条函数最小二乘法，对不同球缝随机性气动力模型进行辨识，提高了参数估计精度。讨论了不同球缝和各种发政治协商会议方式气动力的建模方法，给出了数学模型，并进行了验证，所得结果与实践经验一致。表明气动力模型较符合实际，建模方法可行，模型简单实用，为研究运用球缝发飘球技术，提供了重要的模型依据。

Identification Modeling for Random Aerodynamic Forces on Volleyball with Various Types of Seams

In this paper, the identification modeling for random aerodynamic forces on volleyball with various types of seams and in various fashions of serving ball are studied using the least square method of solving ill-condition normal equation by HOUSEHOLDER transformation and the least square method of the cubic spline function, the estimated accuracies of parameters are improved, the modeling methods of random aerodynamic forces are discussed, the mathmatical models are given and the applying verifications have been finished. The results have been obtained in agreement with the experiences ill volleyball practice. The results show that the modeling methods are feasible, the constructing models are practical and convenient to study dynamic charateristics of float-serve.Thus it provides important model base for studing the float-servicing techniques.