Inertia relief analysis is regarded as an effective technique for the modeling of unconstrained structural systems. In this paper the principle of inertia relief analysis is first described. Inertia relief capability of commercial finite element packages is discussed. The paper studies the implementation of inertia relief techniques into finite element analysis of a variety of structures. Two types of inertia relief methods of MSC/NASTRAN (conventional inertia relief and automatic inertia relief) are also addressed. The application of inertia relief method in the analysis of unbalanced and balanced structural systems is discussed.
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