2 results about "Experimental mechanics" patented technology

This invention provides a method and apparatus for photoelastic stress reconstruction based on physically constrained deep learning, relating to the fields of experimental mechanics and optical mechanics. The method involves acquiring images of the interference fringe state of a transparent specimen under load to obtain multi-channel tensor input data; using a physically enhanced convolutional neural network model for feature extraction and processing, and performing differential calculations to obtain full-field stress component output data; visualizing and rendering the full-field stress component output data to obtain reconstructed visual data; comparing the full-field stress component output data with reference benchmark data, calculating error indices, and recording process time to obtain accuracy and efficiency evaluation data; and simultaneously integrating and displaying the reconstructed visual data and the accuracy and efficiency evaluation data to obtain a comprehensive evaluation and reconstruction result. This invention solves the inherent limitations of traditional phase unwrapping and stress separation techniques.

This invention provides a time-controlled, non-contact deformation measurement method, apparatus, computer equipment, and medium, relating to the field of optical experimental mechanics. The method includes the following steps: determining the time-series control parameters, intrinsic and extrinsic parameters, and coordinate transformation matrix of an industrial camera; acquiring a sequence of images of the surface of the object under test based on a trigger signal and triggering a light source to provide illumination to generate a first data stream; controlling an event camera to output a second data stream showing the pixel brightness changes on the surface of the object under test; parsing the second data stream and dynamically controlling the image acquisition of the industrial camera according to instantaneous motion state parameters; performing digital image correlation matching and 3D reconstruction to obtain a high spatial resolution deformation field of the object under test at the sampling time; performing event-driven 3D reconstruction to generate a 3D deformation measurement result. This scheme resolves the contradiction between clear imaging of high-speed moving objects and long-term continuous acquisition by combining short exposure and long interval time-series control parameters.