Wire rope lay length measurement based on DT-CWT

Abstract

The lay length of metal wire rope constitutes a critical parameter in the characterization of wire rope. Its measurement and subsequent analysis can provide valuable insights into the stress conditions and surface integrity of the material. To solve the problem of measuring wire rope lay length, this paper proposes an online wire rope lay length measurement method based on image processing, which consists of two parts: image pre-processing (DT-CWT) and image post-processing (contour search, inter strand positioning). The wire rope texture is directionally reconstructed by DT-CWT. Then the demarcation line between wire rope strands is found by contour finding and screening. Finally, the wire rope lay length is calculated from the rope strand spacing. This method makes full use of the obviousness characteristics of the spacing between the rope strands to measure the height of robust. The method has been tested in the laboratory. The findings indicate that the proposed method is capable of measuring the lay length of steel wire rope in a non-contact manner.