基于无源无线的螺栓松动监测智能垫圈OA

Railway infrastructure involves a large number of bolted structures,and the loosening of bolts due to insufficient bolt preload often leads to accidents.Therefore,the monitoring of bolt preload becomes an important guarantee for the safe operation of the railway.The traditional detection methods are unreliable and the detection equipment is huge.The passive wireless measurement system provides a solution idea,but the surrounding metal environment will have a non-negligible effect on the communication effect.A new"clover"type smart washer is proposed to address the problem of metal eddy current effect.By designing a new"clover"antenna and washer structure,the eddy current effect can be reduced and the communication quality can be improved.For the scheme,the full prototyping,simulation,and experimental verification are carried out.Compared with the same conditions of the traditional antenna washer combina-tion,the induction distance is enhanced by 60%,the stable communication distance is enhanced by 75%,and the experimental results verify that the new"clover"smart washer can produce a strong spatial magnetic field,and is less affected by the metal washer,which can enhance the communication effect.