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Effective Stiffness: Static Performance of Mechanical Systems
並列摘要
In this paper we discuss the concept of effective stiffness and how it pertains to the analysis of mechanical system models with finite degrees of freedom. Effective stiffness is interpreted for the static model of a mechanical system, defined for displacements around equilibrium configurations. For such cases any displacement of the system can be seen as a movement in a compliant space where the force interpretation is given via potential energy functions originating from elasticity. Effective stiffness is tied to the system representation and how the model is parameterized. The parameterization is defined via the selection of generalized coordinates and velocities to represent the degrees of freedom of the model of the system. This selection of variables can be done in a way that a subset of them is closely related to the functioning/operational requirements of the system, and through that to performance in general. Effective stiffness is defined for the representation of conservative forces associated with the model variables describing the functioning/operational requirements and performance. We derive the framework for this concept and illustrate it with examples.