Identification of Vibrating Structures: An Introduction

Abstract

The dynamic behaviour of novel and complicated structures has to be investigated by system analysis based on drawings (Fig. 1). Starting from a physical model, neglecting all physical effects which are not relevant to the problem to be investigated, one has to build up the mathematical model as a structured equation (parametric model). In certain cases it has to be simplified compared to the physical model. The parameter values of the model have to be calculated using the drawings. Taking into account the loadings (-assumptions) the dynamic system response can be predicted. System analysis results therefore in a parametric computational model. Its accuracy depends on the influence of the introduced simplifications and assumptions. If the structure to be investigated is novel and experiences of comparable structures are not available the errors of the predicted results are unknown, the results may be useful for investigations but cannot prove the qualification of the structure.