Improved Design And Mechanical Analysis Of Coupting In Engine Combustor Test Section

The study has optimized the coupling which is applied on the displacement mechanism of the test switching section of combustion chamber for a certain type aircraft engine, respectively making use of finite element analysis and the way for loading hydraulic rotary cylinder to analyze and research the maximum strength of the post-optimal coupling from theoretical calculation and practical test.When testing the performance of combustion chamber, due to uncertain high temperature, the existing test switching section of combustion chamber for aircraft engine can easily lead to swelling and deformation on installation disk or probes and other components, which will cause friction between installation disk and the casing, increasing the load torque of stepper motor. Because the stepper motor is a motor with high speed and low torque, when friction occurs between installation disk and the casing and load torque rapidly increases, it is so easy to exceed the maximum torque of stepper motor that damage the stepper motor.To the question of damage of stepper motor on the displacement mechanism of test switching section of combustor section for aircraft engine, this paper is to optimize the coupling between the output of stepper motor which is originally installed on the displacement mechanism of test switching section of combustor section for aircraft engine and the input of reducer; then calculate the maximum stress of post-optimal coupling by the theory of finite element method and test the maximum stress by hydraulic rotary cylinder. The close of the two values which are results of theoretical calculation and actual test, indicates that using finite element method can get results consistent with simulation experiments.These analysis and research not only can verify that the post-optimal coupling which is applied on the displacement mechanism of test switching section of combustion chamber for a certain type of aircraft engine can protect the security for the stepper motor, according with the requirements, but also can supply a reference to couplings which is on the displacement mechanism of test switching section of combustion chamber for other models of aircraft engine.