METHOD FOR DETERMINING HYSTERESIS LOSSES WITH A TORQUE SYSTEM WITH INCREASED TEMPERATURES Russian patent published in 2019 - IPC G01N19/02 

FIELD: measurement technology.

SUBSTANCE: invention relates to the field of metrology and can be used in determining the physicomechanical properties of materials and, in particular, the coefficient of hysteresis loss of material in the temperature range up to 360 °C. A method for determining hysteresis losses in the suspension strands of torsion systems, which consists in the fact that, after adjusting the equilibrium position of torsion systems, the initial amplitude of oscillations is set, register amplitudes of damped oscillations of torsion systems, determine the period of oscillations, the quality factor of the system and the coefficient of hysteresis loss of the material of the thread by the logarithmic decrement of attenuation. In order to extend the temperature range when measuring hysteresis losses in suspension threads from room temperature to a temperature of about 360 °C the thread of the suspension is passed through a quartz tube, which is wound with a spiral of nichrome. Current from a source made in the form of a laboratory autotransformer is passed through the coil, the quality of torsion systems is measured at different temperatures and the periods of their oscillations. Temperature is measured with a thermocouple, the sensitive part of which is inserted into the tube through a small hole, moreover, as the temperature rises, the elastic properties of the material of the suspension yarn deteriorate, the oscillation period increases, the hysteresis loss increases, the quality factor of torsion systems decreases. Taking into account the diameter of the ball and the oscillation period of the torsion system, losses due to viscous friction of the ball weight suspended from the thread of the air on the air are calculated. After that, the hysteresis loss in the suspension thread is determined by the quality factor of the system, limited only by internal friction in the thread.

EFFECT: expanding the temperature range when measuring hysteresis losses in suspension strands from room temperature to a temperature of about 360 °C.

1 cl, 1 dwg, 1 tbl