Abstract
Transmission mechanism is one of the most important parts of the Ultra-High Voltage (UHV) circuit breaker. It has specific characteristics such as fast response, high speed, and heavy load in the processes of open and close actions. This paper studies the effects of multiple clearances on the working characteristics of transmission mechanism system, especially the motion of its journal center path during operation. It builds a nonlinear kinetic model of transmission mechanism considering the system energy losses due to the impact and friction between the journal and bearing inside clearance joints. Also, an experimental platform is built to measure the displacement and velocity of the moving contact. The results show that the existence of 15 clearance joints in our mechanism system can cause hysteresis effects on the velocity and acceleration of the moving contact, as well as its acceleration fluctuation. Meanwhile, the increase of friction coefficient will stabilize the dynamic characteristic. In addition, both the experimental and simulation results indicate that the motion of the journal center, which is unevenly distributed along the circle, is characterized by three phases: free flight motion, contact motion, and impact motion.
Highlights
Accurate prediction for dynamic behavior of mechanism is more and more important with the development of precision machinery project
The contact model used to simulate contact force in the clearance joints is based on subroutines “cnfsub.c”
The displacement and velocity of transmission mechanism for Ultra-High Voltage (UHV), which directly indicate the motion characteristics of the moving contact at the output end, are key parameters to determine the interrupting ability of the circuit breaker in transmission motion
Summary
Accurate prediction for dynamic behavior of mechanism is more and more important with the development of precision machinery project. In [9, 10], the effects of joint clearances on mechanism path generation and transmission quality were studied by assuming four-bar and slider-crank mechanism having rigid links Most of these works, are somewhat limited because they have focused on the general multibody systems without flexible bodies. Erkaya et al [19] proposed a numerical model for a slider-crank mechanism which includes one flexible body and two revolute joints with clearances and designed a test rig to study the effects of joint clearance on the dynamics of a partly compliant mechanism. In these works, the research object was only a simple slider-crank mechanism or four-bar mechanism.
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