Research On Anti-shock Electrical Performance Of Electromagnetic Relay Used In Ship

With the improvement of ship electrification,whether electromagnetic relay used in ship can work reliably has a direct impact on the control and safety performance of the ship.In view of the special working environment that the electromagnetic relay used in the ship may be attacked by artillery and torpedo at work,it must have a certain anti-impact electrical performance to ensure that the electrical system will not lose effectiveness when the ship is attacked.Therefore,it is very meaningful to study the impact resistance of ship relay.Firstly,combined with the time domain simulation method,multi-field coupling simulations are carried out for the whole relay of the ship.Based on the finite element method,the simulation model of the relay is constructed,and the dynamic suction characteristics and magnetic induction intensity distribution of the electromagnetic system are calculated.An optimization method for the electromagnetic system of this type of relay is proposed.The time domain simulation method is used to calculate the impact of the relay used in the ship,and the maximum response position of the relay under the design acceleration is obtained.The results show that under the design acceleration of the equipment shock spectrum,the reed is not fatigue damaged,and the contact is not separated.Secondly,the impact resistance of the relay is studied from the point of view of stress.In order to investigate the dynamic response law of the contact reed system more deeply and accurately,further impact simulation analysis is carried out.It is concluded that the stress response is more obviously affected by the acceleration pulse width at high frequency,while the influence of the acceleration pulse width is very limited when the acceleration pulse width exceeds 8ms.By loading the design acceleration on the contact reed system,it is found that the stress at the root of the reed is the maximum and close to the yield limit in the process of impact,and the internal stress in the range of one fifth of the root of the reed changes violently.According to the structure optimization and comparative analysis of this part,it is concluded that the maximum stress of the reed is reduced by 38.1% and the number of impact can be increased by 53.2%.The impact resistance of the relay is significantly improved.Finally,the impact resistance of the relay is studied from the angle of contact indirect contact force.Combined with the spectrum analysis method,the positive and negative triangular wave shock loads with different pulse width and acceleration peak are applied to the bottom of the reed under different pretensions to simulate the impact process.By extracting the contact indirect contact force curve,the response characteristics of the reed and the factors affecting the relay impact failure boundary are analyzed.The results show that the electrical performance of the relay can be improved obviously by increasing the pretension.As long as the pseudo velocity spectrum corresponding to the impact signal is higher than a specific point at the natural frequency of the reed,the contact will be separated.Thereby,proposing a description method of impact environment suitable for shipboard reed contact switch.