通过对设备费用样本的分析，采用了中间线性回归方法和考虑了货币的时间价值，建立了符合缺省数据费用样本的设备经济寿命预测模型。
Based on the analyzing of costs sample of equipment, set up prediction model of economic life of equipment, considering the middle-linear regression method and period value of costs.
为解决非线性搜索的初值问题，采用线性化方法、简单迭代法求得中间矩阵的初值。
In order to get a fine initial guess for the matrix, a linear algorithm and a simple iteration method are introduced.
为了考虑中间压电层与上、下功能梯度层之间的粘结效果，采用线性弹簧模型以模拟界面性能。
To consider the effect of bonding characteristics of the adhesives between the piezoelectric layer and the functionally graded ones, a linear spring layer model is adopted.
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