Temperature Drifts Compensation of Strain-temperature Method for the Measurement of Continuous Welded Rail Temperature Force

摘要

Temperature drift error usually exists in the strain-temperature measurement of continuous welded rail (CWR) temperature force. A piece of invar with low (close to zero) coefficient of thermal expansion is used to simulate the actual CWR. Then the temperature drift of the strain sensor node is measured by using a programmable temperature chamber. The temperature drift error is compensated during the monitoring of the temperature force in actual CWR. Results show that the measured temperature force vibration of the CWR is -681kN～149kN and the stress-free temperature vibration is -2.4～1.0°C within a month after temperature drift error compensation. The temperature force and stress-free temperature after compensation meets the stability condition of the CWR.