【摘要】 针对建筑工料(工日)估算问题,本文首先利用主成分分析得到一组新的输入变量,相对于原始输入变量,有效降低了输入维数,且消除了各输入分量之间的相关性。然后以新的输入变量作为改进型BP网络的输入进行训练与估算,得到了一种新工料(工日)估算方法。仿真结果表明与直接利用BP网络训练估算相比较,采用本文的方法,估算结果更加准确。更多还原

【Abstract】 To estimate the building material consumption, principal component analysis (PCA) is firstly applied to get a new setof input variables. Compared with the old ones, the number of the new ones is fewer, and the correlation of the new inputvariables could be eliminated. Secondly, a new type of BP network is presented to accelerate the convergence’s speed. Thesimulation result is satisfactory.更多还原