Resarch Of Torpedo Differential Propulsion System

Counter-Rotating Propeller(CRP) is still the primary for torpedo propulsion with the CRP itself continuously developing and improving. In China, there is great vitality and has been extensive attention. However, after two propeller torque is not the same, thereby creating an imbalance propeller torque, making overturned produced torpedo, has become the right propeller-driven system to the application of technical problems. This paper gives the design of differential driven system in the CRP, which makes CRP have equal speed and torque , simultaneously have the opposite direction.Firstly, According to the CRP of the environmental, some transmission types which can be used in CRP are analyzed and calculated in order to choose a right transmission type. the differential gear-plus closed kinematic chain of transmission type is chosen because it has some advantages with propeller-driven system. This paper works out the torque , the transmission ratio and the efficiency of the chosen transmission type and offers the theoretical foundation to the mechanism designing and the simulation.Secondly, to achieve the suitable parameters of the differential drive, a optimization algorithm mixed with SA(Simplex Algorithm) and SUMT(Sequential Unconstrained Minimization Technique) are used to optimize the system and attain more reasonable results.Thirdly, The load sharing is very important in planet gear train, to solve this problem, the system uses involute spline to achieve the load sharing. Besides, the errors are analyzed in the paper. All the components are assembled in the Pro/E when they are finished, and checked by the interference checking Model Block. The Pro/E has a motion simulation Model Block to analyze the system's kinematics and make the dynamic interference checking. The analysis results are performed in chart and are verified with the theory. The mechanism is adjusted by the checking results. Finally, the key components of differential drive make finite element analysis using ANSYS. According the results of the analysis, be compared with the theory, the structure of differential drive have been improved. On the basis of the simulation, differential drive finalized the structure parameters, completed torpedo differential drive system design and simulation.