4 results about "Slope error" patented technology

The present application relates to the technical field of precision visual measurement, and particularly relates to an optical performance detection method based on phase deflectometry, a medium and equipment. The method comprises the following steps: obtaining actual point cloud data P of a target surface of a measured object based on reflective phase deflectometry. Design point cloud data Q of the target surface of the measured object is obtained. According to Q and P, a rotation transformation coefficient R * and a translation transformation coefficient T * are determined. According to P, R * and T * , initial measured point cloud data Q' is generated. Target surface shape data of the measured object is generated according to position coordinates of a plurality of points contained in Q'. The target surface shape data of the measured object is subjected to optical performance detection, and optical performance data of the target surface of the measured object is generated. The present application can directly measure and evaluate the optical performance of a measured part more comprehensively and accurately, and gets rid of the non-intuitiveness of the prior art which only evaluates surface shape error, slope error and curvature error of the measured part.

The present application provides a Y waveguide waveform slope measurement and compensation method to solve the problem that the existing high-precision fiber-optic gyroscope Y waveguide waveform slope measurement method is based on the characteristics of the Y waveguide itself, ignoring the error of the fiber-optic gyroscope closed loop modulation wave when resetting caused by the Y waveguide waveform slope after the Y waveguide is connected with the optical path of the fiber-optic gyroscope. The present application uses the existing optical path and circuit for testing the performance of the fiber-optic gyroscope, uploads the Y waveguide waveform slope test results to the upper computer through the circuit, and when a ±23 / 8π square wave is used as a digital demodulation circuit to apply a waveform slope trigger signal, the pressure difference of the fiber-optic gyroscope demodulation signal before and after resetting is the largest. The upper computer calculates the Y waveform slope error, compensates for the error of the fiber-optic gyroscope closed loop modulation wave when resetting, improves the gyroscope precision of the fiber-optic gyroscope at a small rate of rotation, and improves the application range of the fiber-optic gyroscope.

The present application relates to the technical field of materials, and relates to a method for automatically solving the elastic modulus of a metal material under dynamic tension. Engineering stress-engineering strain data of a target metal material under dynamic tension are obtained and preprocessed. Based on the mechanical properties of the material, an engineering strain analysis range is determined. According to the engineering strain analysis range, elastic modulus analysis data are determined from the engineering stress-engineering strain data. Based on the elastic modulus analysis data, linear fitting is performed to determine a first fitting curve. Based on the elastic modulus analysis data and the first fitting curve, the engineering strain analysis range of the target metal material is redetermined. Based on the redetermined engineering strain analysis range, linear fitting is performed to determine a second fitting curve. The slope error between the first fitting curve and the second fitting curve is determined, and in the case where the slope error meets a preset error value, the slope of the second fitting curve is taken as the elastic modulus of the target metal material.

The invention discloses an open caisson construction state recognition method and system based on multi-source data, and belongs to the technical field of open caisson construction. Establishing a three-dimensional model of the construction area, dividing multiple groups of fan-shaped symmetric construction tasks by taking the center point of the top surface as a symmetric point, performing synchronous construction, and collecting elevation value and inclination data; a two-dimensional coordinate system is constructed through equal-interval sampling, and two state curves corresponding to the elevation and the gradient are generated; a task-stage alternate circulation construction mode is adopted, tasks are scheduled based on a linear mapping relation, curve slope errors are evaluated in real time, and a non-uniform state is corrected; and after all tasks reach the standard, performing weighting processing with higher recent weight in combination with historical Euclidean distance data, calculating an accumulated error reference value and a current error influence degree, and outputting an error level. According to the invention, accurate identification, dynamic correction and scientific evaluation of the construction state can be realized, the problems of incomplete traditional construction state monitoring, error evaluation lag and the like can be solved, and the construction safety and the quality stability are improved.