The dynamic response of a stationary truss structure made of Timoshenko beams excited by a moving oscillator is studied in this paper. The frequencies and modes of the truss are first obtained by the finite element method and then the modes are cast in an analytical form within each element through the element shape functions. Each component beam of the stationary structure is meshed with an adaptable number of Timoshenko beam elements. During its horizontal travel and vertical vibration, the oscillator may separate from the vibrating truss and subsequently may reattach to it with impact. Both separation and reattachment with impact are studied. It is found through simulated examples that they produce a noticeable difference in the dynamic response and multiple separation and impact events are possible at high speeds.
展开▼
