Dynamic interaction between two bodies, where one is significantly more flexible than the other, is common (e.g. rotor-casing contact). This paper presents a linear model for simulating contact between rigid and flexible bodies. The motion between contacts is predicted by modal superposition, using separate models for the two components. During contact, the models are coupled via a linear contact stiffness element. The coupled equations are solved by numerical integration. The presented results relate to the short-term dynamics during contact and focus on the effects of using different numbers of degrees of freedom in the model of the flexible body.
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