The experimental platform for measuring the dynamic strain of gear tooth root is built, and the dynamic strain of gear tooth root is measured and studied. At the same time, the semi analytical calculation method and Experimental Research on the medium degree pitting fault of gear are also carried out.
(1) Semi analytical calculation method: according to the potential energy principle and material mechanics theory, the relationship between the tooth root bending strain and the gear meshing stiffness is deduced, and the meshing stiffness of the healthy gear and the gear with moderate pitting corrosion is obtained by calculating the dynamic strain of the tooth root measured by the fiber Bragg grating sensor, and then the dynamic response of the gear system is analyzed by using the dynamic model of the gear system.
(2) Experimental research: vibration acceleration sensor is used to monitor the vibration of the gearbox of healthy gear and gear with moderate pitting corrosion fault, and the correctness of the simulation study is verified by analyzing the vibration acceleration signal in time domain and frequency domain.
The dynamic strain of gear tooth root is measured and studied, and the semi analytical calculation method and experimental research are also carried out for the gear with moderate pitting corrosion. For the healthy gear system and the gear system with moderate pitting failure, the vibration response of the gear system and the dynamic strain of the gear root are measured by vibration acceleration sensor and fiber Bragg grating sensor respectively.
According to the potential energy principle and the theory of material mechanics, the relationship between the bending strain of tooth root and the meshing stiffness of gear is deduced. The meshing stiffness of healthy gear and gear with moderate pitting corrosion is obtained by calculating the dynamic strain of tooth root measured by fiber Bragg grating sensor. Then the dynamic response of gear system is analyzed and studied by using the dynamic model of gear system When the degree pitting fault occurs, the amplitude of vibration response signal will increase abnormally in time domain, and its statistical index value will also increase, such as RMS value, peak peak value, etc. Finally, the experimental vibration signal is analyzed and compared with the simulation results. The simulation results are basically consistent with the experimental results, which verifies the correctness of the simulation results.