【摘要】 依据实验数据，用最小二乘法拟合了人主动脉瓣的粘弹性性能参量——归一化应力松弛函数．这是一个非线性规划问题．在假定数学模型的条件下，我们推导了牛顿法的全部公式，并在计算机上进行迭代，获得了良好了的结果．最终的应力松弛量大约为２０％更多还原

【Abstract】 Abstract This paper has determined the viscoelastic parameter normalized stress relaxation function, of human aortic valve on the basis of experimental data by using least square method. This is a nonlinear problem. We have derived the whole formulae for Newtons method from the given mathematical model of the material, and computed by personal computer. So the satisfactory results have been obtained. The relaxation curve and function show that the final stress in the material decreases by about 20 percent as compared with the initial stress.更多还原