关键词: 关键词:长波子结构；短波子结构；中频振动；复杂组合系统

Abstract:

Abstract: This paper concerns the vibration approximation of complex builtup systems comprising both longand short

wavelength substructures, for which the system vibrations are largely dominated by the socalled “midfrequency” vibration

issues. In previous study, a modebased approach was presented for the vibration analysis of a system consisting of a long

wavelength source and a shortwavelength receiver and validations were made by simple beamplate coupling models. In this

paper, the approach is further analyzed and discussed. Numerical applications are made for more generic beamplate models. It

is shown that the modebase approach is particularly suitable for such cases where there exists a big stiffness mismatch

between the source and the receiver because of its much lower computational cost compared to the conventional FRFbased sub

structuring numerical approach.

Key words: Key words: longwavelength subsystem; shortwavelength subsystem; midfrequency vibration; complex builtup systems