Experimental And Simulation Study On Vibration And Noise Characteristics Of Core Body

With the development of UHV power transmission and the maturity of flexible power transmission in my country,high-voltage,large-capacity power transmission and transformation equipment such as transformers,reactors and other core bodies have long been subjected to external stress and complex excitation during operation,resulting in vibration The problems of noise and iron loss are becoming increasingly serious.Aiming at the vibration and noise problem of the core body under complex working conditions,this article starts from the comprehensive magnetic performance of the monolithic oriented silicon steel sheet under the influence of multiple factors,and combines the core vibration and noise of the core without air gap,the laminated core with air gap and the shunt reactor model In the experiment,a simulation model was established based on the principle of magnetic-mechanical-acoustic coupling,and the simulation results were compared with the experimental results.The main research contents include:(1)A comprehensive magnetic performance measurement platform for soft magnetic materials was built,and the monolithic magnetic characteristic measurement device and the stress application device were used to measure the comprehensive magnetic performance change trend of the silicon steel sheet under the combined influence of different excitations and different stresses,and the power frequency pulldown stress and compressive force were obtained.The effect of stress on the magnetostriction,hysteresis loop and iron loss characteristics of oriented silicon steel sheet.The combined effect of stress and frequency,as well as the trend of changes in the comprehensive magnetic properties of silicon steel sheets under the combined effects of stress and harmonics,are further studied.The effects of frequency,harmonics,and stress on the magnetic properties,magnetostrictive properties and noise properties of oriented silicon steel sheets are obtained.(2)Sinusoidal excitation and DC bias excitation were applied to the air-gap-free and air-gap-laminated core models,respectively,and the laser vibrometer and noise tester were used to measure the core vibration and noise characteristics of the two models under different excitations,and based on the magnetic-The mechanicalacoustic coupling principle builds a simulation model,and compares the experimental results with the simulation results,analyzes the influence of sinusoidal excitation and DC bias on the vibration of the laminated core,and the influence of the presence or absence of air gap on the vibration and noise of the laminated core.(3)The core vibration and noise experiment under different sinusoidal excitations was carried out on a shunt reactor.The experimental data were measured with a laser vibrometer and a noise tester,and the vibration of different parts of the core cake was compared.Build a three-dimensional simulation model based on the principle of magnetic-mechanical-acoustic coupling,and compare the noise characteristics of different locations.The experimental results of vibration and noise are compared with the simulation results to verify the accuracy of the simulation calculation.The work of this paper has a certain guiding significance for the study of the vibration and noise law of the core body under complex excitation and stress,and provides a theoretical basis for the design and optimization of the vibration and noise reduction of the core vibration and noise of the UHV transmission and transformation equipment in the future.