DETERMINING COMPONENT LOADS AND STRESSES WITH IMPROVED SYSTEM MODELING TECHNIQUES

摘要

With more emphasis being placed upon the performance of complex structures and increased use of modal representations of components, there exists the need to have accurate modal representations of these components in a complex system. The present work will discuss the use of static correction terms to improve the modal representation of components by accounting for the effect of truncated higher frequency modes. This work will also discuss the determination of the dynamic load field experienced by a component in a system and the resulting strains and stresses. The basic approach combines the use of modal analysis, system dynamic analysis, and finite element analysis into a very automated procedure to allow design engineers to determine complex dynamic loads and stress/strain distributions with a high degree of confidence prior to building and testing a prototype. Modeling considerations and limitations will be discussed. Examples will be presented to illustrate the approach and to accuracy improvements.