  Complex mechatronic systems are typically composed of interconnected modules,
often developed by independent teams. This development process challenges the
verification of system specifications before all modules are integrated. To
address this challenge, a modular redesign framework is proposed in this paper.
Herein, first, allowed changes in the dynamics (represented by frequency
response functions (FRFs)) of the redesigned system are defined with respect to
the original system model, which already satisfies system specifications.
Second, these allowed changes in the overall system dynamics (or system
redesign specifications) are automatically translated to dynamics (FRF)
specifications on module level that, when satisfied, guarantee overall system
dynamics (FRF) specifications. This modularity in specification management
supports local analysis and verification of module design changes, enabling
design teams to work in parallel without the need to iteratively rebuild the
system model to check fulfilment of system FRF specifications. A modular
redesign process results that shortens time-to-market and decreases redesign
costs. The framework's effectiveness is demonstrated through three examples of
increasing complexity, highlighting its potential to enable modular mechatronic
system (re)design.
