| Combined Diesel and Gas Turbine(referred to as CODAG)is a typical combined power system consists of diesel and gas turbine,which is one of the most advanced ocean-going warship power in the world.The Combined Diesel and Gas Turbine transmission system has been already maturely applied to vessels abroad.However,it is still in the theoretical research stage at home.Special researches on transmission device is even less,alough it is a core equipment in the Combined Diesel and Gas Turbine power system.With Chinese navy strategic transformation to “blue ocean” navy,it is imperative to develop the Combined Diesel and Gas Turbine powered warships independently.Therefore,it is of great significance to carry out the dynamic performance research on the Combined Diesel and Gas Turbine transmission for promoting the application of the Combined Diesel and Gas Turbine power system in China.In this paper,the dynamic impact features were studied,which happened during the operation shifting process of the Combined Diesel and Gas Turbine transmission.The dynamic performance test principle of the Combined Diesel and Gas Turbine transmission was determined on the basis of analyzing the operation characteristics and technical features.The test bed design was completed which consists of motor,synchronous-self-shifting clutch,double-speed gearbox,gear increaser,parallel operation gearbox,hydraulic dynamometer and torsion meter.Based on the lumped mass method,a model is established for the operation shifting impact simulation of the Combined Diesel and Gas Turbine transmission by using SimulationX.The validity of the simulation model was verified through steady-state operation test and operation shifting test.The dynamic impact characteristics of the Combined Diesel and Gas Turbine transmission were also determined based on above tests.In addition,some structural optimization measures such as shortening piston axial size and increasing radial drainage hole were verified through experiments to make sure the influence rules for the the drag moment of friction clutch in the double-speed gearbox.In this paper,the main research results show that:(1)When the clutch status of the double-speed gearbox shifts from low speed friction clutch joint to high speed friction clutch joint,there will be an obvious torque impact,and the impact magnitude is proportional to the output end inertia.(2)It has enough precision to establish the operation shifting impact simulation model by using the software of SimulationX.The steady-state simulation error is less than 3%,and the dynamic simulation error of impact peak is less than 8%.(3)During the operation process of the double-speed gearbox,the friction clutch has an obvious oil drag phenomenon.The drag moment can be significantly reduced by shortening the piston axial size and increasing the radial drainage hole.And the drag moment reduction increases with the increment of the double-speed gearbox input speed,but it does not change with the variation of the oil pressure. |
PDF Full Text Request