Abstract:In order to enhance the sealing property of piston rod dynamic seal structure of Stirling engine and reduce the wear loss of seal structure,taking a type of Stirling engine as an object,the Kriging models of wear performance and sealing property of piston rod sealing ring were established,in which the response values are the wear loss of sealing ring,and contact stress between sealing ring and piston rod,the design variable is the sealing chamber pressure.To regard the minimum value of wear loss and maximum value of contact stress as the optimization objects,to take the established Kriging models as the objective functions,the optimization model of the sealing chamber pressure was constructed.The optimum value of the sealing chamber pressure was sought by the NSGAⅡ algorithm,and the concrete value was 695 MPa.The test results obtained by sealing performance test device indicate that the optimum sealing chamber pressure can guarantee the piston rod sealing performance,and also reduce the wear loss of sealing ring effectively.