Testing Method for the Enclosed Space Based on Image Identification and Unity3D Virtual Comparison Techniques

Abstract

Hydropower turbine runner chamber, thermal power boiler header and pipeline are all typical enclosed spaces. To solve the technical problems of the existing testing methods for the key hidden metal components (such as the decompression panel and the water board of turbine runner chamber, the welded structures and foreign matters of header and pipeline) of the enclosed spaces, such as the poor reliability and the larger testing blind spots of the testing device, under the downtime without opening the cover of the enclosed spaces, an testing method for the enclosed space based on image identification and Unity 3-D simulation comparison techniques was proposed. The tracked magnetic creeper car which carries the real-time image collection instrument was used to complete the crawling work on the inner surface of the closed space. After the location is collected by the positioning assistant device, the position of the real-time testing image in the virtual 3D model is calibrated. Comparison between real-time testing image and simulation image, the different regions could be calibrated in the virtual simulation image, and then the defects or foreign bodies fall into could be accurately positioning. The field application test indicated that the field application test shows that the device can be calibrated accurately without opening the cover of the closed space. It is convenient to remove foreign bodies, and it is easy to maintain and clean.