4 results about "Systematic deviation" patented technology

This invention discloses a safety assessment method for inverting the internal force state of anti-slide piles based on corrected inclinometer data. Inclinometer data is collected along the depth direction of the anti-slide pile using an inclinometer, and the data is preprocessed. A polynomial model is established to fit the pile deflection. Then, a constraint matrix and constraint vector are constructed, and the constraints are solved using regularization. The distribution of internal forces in the pile is calculated using derivatives. The quiet zone at the bottom of the anti-slide pile is identified, and the foundation coefficient at each measuring point is inverted. The distribution of landslide thrust and thrust characteristic parameters are analyzed. The safety factor is calculated using the extreme values ​​of thrust internal forces, and a safety assessment and early warning are provided for the project. This application intelligently integrates the measured displacement of the pile top dial gauge with the relative displacement data of the inclinometer tube, solving the system deviation problem caused by initial readings and zero-point drift. It can accurately reflect the actual stress and deformation characteristics of the pile body. A high-order polynomial continuous fitting model for the entire pile achieves a precise description from discrete measuring points to continuous deformation.

The application discloses a pig weight and body size measuring method, and belongs to the field of pig weight and body size measuring. The method comprises the following steps: collecting a back video above a cage scale and frame extraction to obtain a video frame set; constructing a structure adaptive coordinate corresponding to each video frame; initializing distortion parameters and scale parameters; performing body size measurement; if the distortion parameters and the scale parameters are converged, performing weight measurement, and calculating a weight uncertainty approximation and an abnormality proportion; if the weight uncertainty approximation or the abnormality proportion is greater than a corresponding threshold, performing re-measurement, otherwise, taking a segment-level body size and an observed weight of a current round as final pig body size and weight; if the distortion parameters or the scale parameters are not converged, sequentially updating the distortion parameters and the scale parameters, and returning to perform body size measurement again according to the updated distortion parameters and the scale parameters. The application solves the problems of scale calibration difficulty, unfixed visual angle and scale drift in the prior art, and the problems of systematic deviation of body size / weight.

This invention provides a method, apparatus, and system for determining the minimum test size of a flying probe testing machine. The method first determines the systematic and random deviations of the moving screw and target positioning accuracy in the flying probe testing device based on a moving screw and target positioning test. Then, it determines the systematic and random deviations of the vertical drop accuracy of the test probe in the flying probe testing device based on repeated probe drop tests. Finally, based on the systematic and random deviations of the moving screw and target positioning accuracy and the vertical drop accuracy of the test probe, and using an accuracy prediction model, the minimum test size of the flying probe testing machine is determined. This allows for a direct prediction of the minimum size of the solder pads that the current flying probe testing device can test, preventing frequent test probe misalignment errors and misjudgments / missed judgments due to insufficient testing accuracy of the flying probe testing device. It also reduces testing time extended by manual intervention and improves the testing efficiency of the flying probe testing device.

This invention discloses a method for identifying the geometric error of the B-axis in a five-axis swivel-head CNC machine tool, belonging to the field of CNC machine tool accuracy testing and error compensation technology. The method first establishes a B-axis body coordinate system model, measuring position-independent perpendicularity and angular positioning errors as known parameters. Then, it sequentially executes four measurement modes: B-X, B-Z, B-Y, and B-XY, obtaining the equations for the change in rod length of the ballbar in each direction. By solving the simultaneous equations, it sequentially solves for the three runout errors and three angular errors of the B-axis, completing the identification of all six position-related geometric errors. This invention has advantages such as comprehensive error identification, high measurement efficiency, high identification accuracy, small systematic deviation, adjustable parameters, and strong engineering applicability, and is suitable for the rapid and accurate identification of B-axis geometric errors in various types of five-axis swivel-head CNC machine tools.