Research On Three-dimensional Stress Distribuation Of Reactor Core

The problem of vibration and noise of a reactor is an important aspect which affects the application of reactor.The primary cause of vibration and noise is the internal force of the reactor.Only an accurate and reasonable analysis of the force,can we design an appropriate damping system or vibration isolation system.So the research on three-dimensional stress distribution of reactor is significant.Many kinds of unexpected excitation power supply wave were received by reactor in working status.Harmonic wave is a kind of them.It`s a better way to understand the vibration in actual working status through researching the distribution under the excitation power supply with harmonic wave.This paper built an iron core which similar to the core in actual reactor was based on Epstein Frame principle to finish the measurement of the magnetic properties of silicon steel sheet.The magnetic property of silicon steel sheet was measured under third harmonic,fifth harmonic,seventh harmonic and ninth harmonic superposition with fundamental wave.There were two ways of the fundamental wave and harmonic superposition,in-phase superposition and reverse-phase superposition.This paper chose the third harmonic situation as its main research contents.The finite element analysis method was used in this paper to build a simulation model.The model under the situations of 30% harmonic content in-phase superposition and reverse-phase superposition and 60% harmonic content in-phase superposition and reverse-phase superposition were made using the magnetic properties of silicon steel sheet that tested by iron core model in each situation.Magnetic field distribution,Maxwell stress tensor distribution and vibration acceleration were analyzed in this paper.