Modelling nonlinear dynamics of bolted assemblies

Abstract The dynamics of threaded fastened assemblies represent a highly nonlinear constrained vibration problem that is nontrivial, but of considerable practical importance. In this paper, a dynamic model of a fastened assembly is developed which incorporates a dynamic fastener model with dynamic structural component models. Simulations from the model reveal that fastener placement in assemblies can be optimized to reduce vibration-induced loosening. This result is fundamentally significant since the current practice for placement and orientation of fasteners in assemblies is generally based on convenience or static load and strength considerations, and not dynamic considerations.