The use of polynomial fitting broken fiber lightweight aggregate concrete and the number of freeze-thaw damage the relationship between the degree of change, a better fitting relations.
利用多项式拟合纤维轻骨料混凝土碎冻融次数与损伤度变化的关系，拟合关系较好。
Then, using curve fitting and optimization method, the linear model, hysteresis model and variable linear model of pressure-torque relations are developed based on test data.
其次，在获得大量试验数据的基础上，运用曲线拟合和优化技术，建立制动压力-力矩关系的线性模型、迟滞模型和可变线性模型。
The nonlinear fitting is made on the relations between the nonlinear modulus and strain. The velocity formula in the elastic medium is corrected by using nonlinear modulus instead of elastic modulus.
对非线性模量与应变的关系作了非线性拟合，用非线性模量来代替弹性模量，对弹性介质中的波速公式作了修正。
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