| 摘要 |
FIELD: construction.SUBSTANCE: control method of rail strings of continuous welded railroad track includes registration of a rail string temperature and control over the rail string creeping. Areas of stress state of the rail string by the current values of the string temperature and intensity of generated Barkhausen noise are detected additionally. An actual value of mechanical longitudinal stresses by dependence diagram of Barkhausen noise intensity on mechanical longitudinal stresses, obtained during calibration of the intensity analyser of magnetic Barkhausen noises is determined also. When calibrating the analyser, the sample carved out of the rail steel sample is subjected to axial compression and longitudinal bending. When constructing the calibration curve, intensity of magnetic Barkhausen noise is estimated as the difference between the analyser readings to their sum, obtained when measuring the intensity of magnetic Barkhausen noise in two perpendicular directions. The obtained values of stresses and temperature are applied on the calculated dependence of values of stresses in the rail on the temperature of the rail string, difference between the measured and calculated stresses is determined and the fixing temperature deviation from its normative value is determined by the value of difference.EFFECT: increase of control precision of rail strings.2 dwg |
