The Dynamics Analysis Of Two Down Swashplate Mechanism

The helicopter swashplate is the most critical components in the rotor system, and the rotor total distance and periodic displacement are controlled by helicopter swashplate. The flight pose of helicopters are controlled by the down swashplate mechanism, which consisted of stationary-ring of the swashplate, manipulation line and self-lubricating spherical plain bearing, and played an important role in helicopters. The dynamics of the hingeless helicopter down swashplate mechanism for the equivalent 3-RUS-PU mechanism and the articulated helicopter down swashplate mechanism for the equivalent 3-SPS-RRS-PS mechanism was analyzed, which provided a theoretical basis for the testing device design of the service performance of self-lubricating spherical plain bearings.The helicopter swashplate was researched. The freedom of the 3-RUS-PU mechanism was analyzed based on the theory of parallel mechanism. The first order influence coefficient matrix and the second order influence coefficient matrix of the 3-RUS-PU mechanism were established. And the size range of the 3-RUS-PU mechanism was optimized with the acceleration performance indicators.The 3-SPS-RRS-PS mechanism was analyzed emphatically. The 3D simulation model was established using PRO/E based on the relationship between structure and movement of helicopter down swashplate mechanism. Based on the kinematic analysis, the force analysis of 3-SPS-RRS-PS mechanism of the down swashplate mechanism was studied, the balance equations of each bar were established and then a multi-equation was formed. The solution of the multi-equation and the stress curves of the spherical plain bearing were obtained by MATLAB software. The 3-SPS-RRS-PS mechanism was simulated by ADAMS, and the stress curves of spherical plain bearing were in accordance with the theory results. So the physical simulation model was correct, a reference for the testing machine design of spherical plain bearing was provided.