4 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.

The invention relates to the technical field of structural wind engineering and experimental mechanics, in particular to a spanwise structural aerodynamic force fine identification method and system based on Gaussian integrat.The method comprises the steps that a plurality of measurement sections are arranged, the distribution positions of measurement points are positioned, and a reference coordinate system is constructed; normalizing the size of the spanwise structure, determining the measuring point position of each section, numbering according to a sequence, and collecting wind pressure time history data; standardizing the wind pressure time history data, calculating the net wind pressure coefficient time history of the corresponding measuring point, and determining the weight coefficient of the corresponding measuring point; determining aerodynamic force and torque coefficients of the measuring points; obtaining a disturbance component, and constructing a weighted covariance matrix of aerodynamic force and torque coefficient time histories of any two section measuring points; normalizing the weighted covariance matrix to generate a normalized covariance matrix; visualization is achieved through a two-dimensional normalized covariance matrix heat map, and distribution characteristics of aerodynamic force in the spanwise direction of the structure are recognized and extracted; and high-precision identification of the spanwise aerodynamic force effect is realized.

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.

The utility model discloses an anti-torsion force measuring device for a large-scale vortex-induced vibration model test, which belongs to the technical field of experimental mechanics and ocean engineering test equipment and comprises an upper connecting plate and a lower connecting plate which are connected through an array sensor module. The bottom of the lower connecting plate is connected with a stress model assembly through a lower end connecting rod. According to the torsion-resistant force measuring device for the large-scale vortex-induced vibration model test, through arrangement optimization, a torsion-resistant structure is realized, the influence of bending moment generated by a cantilever structure on the measurement precision of a sensor is eliminated, the accuracy of force measurement and the stability of a system are improved, and the reliability of the system is improved. The method is suitable for research scenes related to large-scale model experiments such as vortex-induced vibration.