Research On Numerical Simulation And Experimental Method Of Frictional Temperature Rise Of Safety Gear

As the speed of elevators goes higher, the frictional temperature rise in the braking process of the safety gear begins to attract public attention. High temperature can weaken the braking performance of the gear and thus cause the risk. However, there is little relevant research and experimental method on the temperature rise of the safety gear.Research has been done on the frictional temperature rise of the safety gear in this paper. A finite element model has been established to simulate the braking process and different experimental methods have been studied.Firstly, a new theory model describing the behavior of friction between safety gear and rail has been established and fundamental theory relating to thermo-mechanical coupling has been analyzed, including contact theory, thermal conduction theory and frictional heat theory. The way of finite element method to solve equations of transient temperature field and thermo-mechanical field has been given.Secondly, a finite element model has been established and the braking process of the safety gear has been simulated. The simulation results have been discussed, including variation of the highest temperature and the distribution of temperature on the surface of the gear. The comparison between the heat transfer model and contact-based model has been done. Different factors which can affect the highest temperature rise have been studied.Thirdly, an experiment has been designed and conducted to measure the frictional temperature rise in the action of safety gear in low-speed condition. The temperature rise curve has been obtained and compared to the curve simulated by the finite element model. The results show that these two curves have fair agreement, which proves the effectiveness of this simulation method.Finally, new test method and test equipment have been developed to measure the frictional temperature rise of safety gear in high-speed condition. The design of whole structure and major components have been done and a new simulated safety gear which is exclusive for the test equipment has been developed.The theory and simulation model, experimental method study and the results obtained in this paper are valuable for the research on the frictional temperature rise of safety gear.