<正>应用非线性回归经典理论，阐述非线性模型线性化的标准。用固有非线性和参数效应非线性作为判断准则，可加快模型拟合的速度，提高精度，为林木生长模型的参数辨识提供较好的方法。该判断准则实用、简单、准确、结论唯一。

A bridge aging pedestal electricity control system with PLC control was designed in the paper. The principle and characteristics of the system were also introduced in detail. Some functions such as procedure control, sampling analysis, data process, self-detect and alarming were carried out with the control system,and furthermore,the control system realized the man-machine dialogue through touch screen. The direct current parameter could be adjusted for the required AC voltage parameter of bridge aging pedestal,automatically controlling the high precision for inverted bridge aging pedestal.