Experimental study on strain and stress of steady device in a catenary for a high-speed railway

Abstract

Steady device is an important component in a catenary for a high-speed railway. It plays an important role in ensuring the current collection quality and stable and reliable operation of the train. In this paper, the strain distributions of positioner tube, column and pin sleeve in the positioning device are measured by strain gauges in our laboratory, and the variation laws of axial and transverse strains, and axial stresses of the three key components under different horizontal and oblique loads, and lifting heights of positioner are studied and analyzed. It is found that the strains and axial stresses of all measuring points basically have a linear relationship with the horizontal load, which are little affected by the oblique load. There is an ‘arch’ change law between these strains/stresses and the lifting height of positioner. For the stresses of two measuring points at the same section, the tensile stress is generally higher than the compressive stress. The maximum tensile stress occurs on positioner tube, which is the weakest part. This work provides the technical support for the material selection, structural design and detection of the positioning device.