The Structural Optimization And Rigid-flexible Coupling Dynamic Simulation Of Rhombic Mechanism Of Stirling Engine

Stirling engine is type of external combustion thermomotor with wide energyadaptability. Its application research has very important significance in solving theenergy crisis, reduce emissions and some special military applications, especially in thefield of solar thermal power generation. As an energy exchanging and outputtingmechanism, the structural dynamic performance of rhombic driven mechanism play asignificant role in the performance of stirling engine. This paper based on the theory ofmultibody dynamics, combining Pro/E, MSC.ADAMS and ANSYS to build arigid-flexible coupling model with flexible connecting rod, and then performing relativeanalysis.First, expounded the principle of stirling cycle and stirling engine and determinedthe structure size of rhombic driven mechanism. Using the isothermal analysis methodto calculate the overall performance of stirling engine, containing the volume ofregenerator, hot and cold cavity, the working medium pressure and circulation workcalculation, the working medium flow and distribution in the recycling process.Second, introduced the characteristics of rhombic driven mechanism and its motionlaw, such as the displacement of power piston and displacer piston, the volumechanging rule of the hot and cold cavity, then derived the cycle work equation.Comprehensive considering the machine size limit, the component moving range, andthe existing conditions of mechanism, established the power optimization model ofrhombic driven mechanism, finally solved the mathematical model by using geneticalgorithm toolbox of MATLAB.Finally, builded the three-dimensional model of rhombic driven mechanism, andthen transmit to ADAMS to create joints and constrains. Respectively introducedseveral methods of creating flexible body, also used ANSYS to set up the flexibleconnecting rod which would be used to export the modal neutral document. Afterwards,performed the rigid flexible coupling dynamic analysis after replace rigid body withflexible one. Studied the influence of elastic deformation on the component ’smovement and dynamic characteristics, made a contrast with rigid modal. Exported theflexible body load spectrum as the boundary conditions of finite element program， carried on an analysis of stress and intensity.