4 results about "Standard distance" patented technology

The invention relates to the technical field of flatness measurement, in particular to a flatness detection device and method for an external wall thermal insulation board. The method comprises the following steps: acquiring a measurement distance and a coordinate characteristic value; a fluctuation index is obtained based on the measurement distance, fluctuation determination of fitting of the measurement distance and second-order fitting deviation of the measurement distance and the coordinate characteristic value; determining a standard distance through the measurement distance, and obtaining an anti-interference degradation index based on the difference between the measurement distance and the standard distance and the energy ratio after the fluctuation degree wavelet basis change; constructing a nonlinear compensation function through the anti-interference degradation index to calculate a compensation amount, and compensating and correcting the measurement distance in combination with the direction of the residual error of the measurement distance to obtain a corrected measurement distance; and detecting the flatness based on the corrected measurement distance. According to the invention, the flatness detection precision is improved.

The application relates to the technical field of flatness measurement, in particular to a flatness detection device and method for external wall thermal insulation boards. The method comprises the following steps: acquiring a measurement distance and a coordinate characteristic value; determining a fluctuation index based on the measurement distance, the fitting fluctuation of the measurement distance and the second-order fitting deviation of the coordinate characteristic value; determining a standard distance based on the measurement distance, and acquiring an anti-interference degradation index based on the difference between the measurement distance and the standard distance and the energy proportion of the wavelet basis after the fluctuation degree is changed; constructing a nonlinear compensation function based on the anti-interference degradation index to calculate a compensation amount, combining the direction of the residual error of the measurement distance to compensate and correct the measurement distance to obtain a corrected measurement distance; and detecting the flatness based on the corrected measurement distance. The application improves the detection precision of the flatness.

This invention discloses a calibration method for an integrated land-water point cloud ranging system. The method involves calculating the standard coordinates of the center of the first and second target spheres based on prism coordinates, and then calculating the vertical distance between the centers of the first and second target spheres, denoted as the standard distance. The method also involves acquiring the detection coordinates of the center of the first and second target spheres, and calculating the vertical distance between them, denoted as the detection distance. The difference between the standard distance and the detection distance is calculated and output as a standard distance consistency evaluation value. Keeping the distance between the first target sphere and the horizontal plane constant, the method changes the distance between the second target sphere and the horizontal plane, returning to acquire the prism coordinates detected by the total station, until n standard distance consistency evaluation values ​​are obtained. The integrated land-water point cloud ranging system includes: a shipborne integrated land-water system, a point cloud ranging system, and a total station prism system.

This invention relates to the field of rail transit technology, and in particular to a method and system for detecting the fitting rate of mounting surfaces. The method includes: acquiring a data cloud map of the component to be tested, wherein the data cloud map includes a mounting surface and a reference surface formed by data points; performing regression processing on the reference surface to obtain a regression surface of the component to be tested; aligning the regression surface with a reference surface of a template model of a preset model of the component to be tested; and, after the regression surface and the model reference surface are aligned, obtaining the fitting rate of the mounting surface based on the proportion of the number of data points on the mounting surface whose measured distance is less than or equal to a preset standard distance to the total number of data points. The purpose of this invention is to solve the problem of errors in the results of rapid detection of the fitting rate of mounting surfaces of components to be assembled during the repair and assembly of multiple parts on a high-speed train, thereby eliminating the errors caused by relying on human experience in traditional methods.