A trust-region method for optimal H₂ model reduction of discrete-time dynamical systems

Time‐limited pseudo‐optimal ‐model order reduction

“…Moreover, the stability of the ROM is not guaranteed. There are some methods reported in the literature, which use trust‐region methods to speed up the convergence of IRKA like [32–34]. In [35], a projection‐based algorithm is proposed, which provides a sub‐optimal solution to the ‐MOR problem while guaranteeing the stability of the ROM at the same time.…”