SUBSTRUCTURAL DYNAMIC MODIFICATION USING COMPONENT RECEPTANCE SENSITIVITY

A frequency response function (FRF)-based sensitivity analysis is prac tically useful and advantageous for both model updating and structural dynamic modification. However, in the case of a large system, the upd ating process involves much computational effort due to the full syste m matrices. Another limitation is that FRF sensitivities have a non-mo notonous character as a function of the input parameters, and thus div ergence is possible during the iterative estimating process. In this p aper, a new FRF sensitivity method focused on a substructuring approac h is developed. This method, called the component receptance sensitivi ty method, has a computational advantage by avoiding the iterative com putation of unmodified components. In addition, a stable estimating te chnique which minimises the possibility of divergence caused by a non- monotonous, non-linear character of receptance sensitivity is proposed . Finally, the suggested method is applied to the estimation of spring stiffness values in a spring-supported plate model. As a result, the high accuracy and efficiency of the method is verified. (C) 1995 Acade mic Press.