The question when a general linear time invariant control system is equivalent to a port-Hamiltonian systems is answered. Several equivalent characterizations are derived which extend the characterizations of \cite{Wil72a} to the general non-minimal case. An explicit construction of the transformation matrices is presented. The methods are applied in the stability analysis of disc brake squeal.

翻译：回答一般线性时间变数控制系统相当于港-汉堡系统的问题。 得出了几种等效特征, 将\ cite{Wil72a} 的特性扩展至一般非最小情况。 提出了变换矩阵的明确构建。 方法用于对制动器的稳定性分析 。