Monitoring method for residual fatigue life of expansion joint bellows
A technology for fatigue life and expansion joints, applied in the field of expansion joints, can solve the problems of bellows' fatigue life impact, failure to provide early warning and alarm, etc., to facilitate on-site maintenance and repair, ensure safe operation, and reduce workload
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[0020] Such as figure 1 As shown, a method for monitoring the remaining fatigue life of the expansion joint bellows is to measure the displacement of the expansion joint bellows in the working state through the sensor in real time, and transmit the displacement to the PLC, and the PLC calculates the next time period m in the working state W fatigue life of inner bellows [N cw ], where w = 1, 2, 3..., by Obtain the remaining fatigue life N of the bellows rf , Where [N c ] Is the design fatigue life of the bellows, the PLC displays the remaining fatigue life value, and will give an early warning and alarm when the remaining fatigue life reaches the set alarm value.
[0021] The displacements are lateral displacements, angular displacements, axial displacements or torsional displacements, and various displacements are measured by their corresponding displacement sensors installed on the expansion joints.
[0022] Such as figure 2 , 4 As shown, the internal pressure axial expansion j...
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