Research On Temperature Field Of High Elastic Plastic Alloy Coupling

This project，"research on dynamic&static behavioral mechanism and designmethod of new high-performance plastic alloy flexible coupling"(51175525/E0506)，originates from the National Natural Science Fund Projects and also funded byindependent research fund of State Key Laboratory of Mechanical Transmission,Chongqing University. With the development of mechanical industry and nationaldefense, the demand for high-performance coupling used in vehicles, ships, defenseweapons and other power transmission systems is increasing in China. The new-typedelastic coupling， whose elastomer made of plastic alloy material BTG, has theadvantages of reducing vibration and noise, high reliability, high torque, etc. Due tolocal accumulation of heat resulting from high friction heat and viscoelastic dissipationheat generating，plastic alloy of the flexible coupling would bear high heat load andhigh temperature, and thus the flexible coupling’s bearing capacity would reduce. Inaddition, the high temperature of BTG plastic alloy could also lead to thermal strain onthe surface material, which would seriously affect the transmission performance.Therefore, the research on temperature field of the new-typed coupling has practicalsignificance.In the thesis, the study actuality about coupling and frictional temperature rising isfirstly summarized, and some finite element analysis theories is also introduced in brief.Based on the principles of heat transfer, tribology, contact mechanics, viscousdissipation theory, using MATLAB to calculate the frictional heat flux, viscousdissipation and heat transfer coefficient, using WORKBENCH to simulate temperaturefield, by means of theoretical analysis and finite element simulation, the steady-statetemperature field for the new-typed coupling is studied. The major contents are asfollows：①The variation of friction coefficient between engaging surfaces (aluminum andplastic alloy BTG) with rubbing speed, temperature and pressure is investigated, andthe range of friction coefficient under normal working conditions is obtained;②Calculation of heat flux distribution coefficient of the engaging surfacesaccording to the theoretical formula; Based on the establishment of the average contactstress model, the average contact stress formula is deduced;③Convective heat transfer on the surface of the coupling is analyzed, frictional heat flux of engaging surfaces and heat transfer coefficient on the surface of thecoupling are calculated accurately;④The formula of heat production rate of viscosity loss deduced and the variationof BTG storage modulus and loss factor with temperature obtained by experiment, andthen the variation of heat production rate of viscosity loss with temperature is achieved;⑤Distribution of the steady-state temperature field is simulated byANSYS，andbased on the simulation, the influence of factors such as revolutions, loads, ambienttemperature on the temperature field is discussed systematicly;...