Experimental study on the nonlinear dynamic characteristics of a kind of hinged connection structure

Abstract

The hinged connections are widely used in mechanical structures, such as the expandable structures and truss structures in spacecraft and the three-point hitch device in agricultural machinery. The hinged connections allow relative rotations between the connected members so that the positions of mechanical structures can be adjusted. Thus, the hinged connections are always subject to large and complex forces during working operation, and these will lead to complicated nonlinear vibrations which have a significant impact on the working performance and fatigue lifespan of the mechanical structures. Therefore, the nonlinear dynamics characteristics of the hinged connection are studied. Firstly, the experimental platform of a typical hinged connection is established according to the mechanical structure characteristics and loading features of the hinged connection structure. Then the vibration experiments of the hinged connection structure are carried out respectively under different working conditions. Finally, the effect of hinge clearances and excitation frequencies on the nonlinear dynamics of the hinge connection structure is studied by the vibration response of the hinge connection structure under different working conditions. The results of this study can provide a reference for the optimal design of the hinged connection structure.