围护结构动态负荷传递函数模型合成的系统辨识法

System identification method for composition of z-transfer function of building envelope

为求得稳定、低阶、高精度的围护结构动态负荷合成传递函数模型 ,提出了基于系统辨识理论的传递函数模型合成方法 ,通过对有限个传递函数叠加成的线性系统进行最小二乘法辨识 ,获得该系统的等价传递函数模型。对 6个 1 0阶以上的传递函数进行合成 ,得到 5阶的合成传递函数 ,并采用阶跃扰量和正弦波扰量检验其稳定性和精度 。

In order to get a stable, low order and acc ur ate composite z transfer function of dynamic load of building envelope, develop s a method of z transfer function composition on a basis of the system indentif ication theory. The z transfer function equivalent to linear superposition syst em of limited z transfer functions could be derived through the least square ap proximation procedure. A five order composite z transfer function is obtained f rom six 10 or higher order z transfer functions with the method. The stability and accuracy test results show good effects with checkout by step and sine wave .