35 results about "Measurement theory" patented technology

The invention discloses an EMD based fiber-optic gyroscope temperature drift multi-scale extreme learning machine training method. The EMD based fiber-optic gyroscope temperature drift multi-scale extreme learning machine training method comprise the following steps of (1) adopting a bounded ensemble empirical mode decomposition (EEMD) method to respectively decompose drifting output data of a fiber-optic gyroscope in different temperature-changing-rate environments into a series of intrinsic mode functions; (2) adopting a sample entropy (SE) measurement theory to calculate SE values of the intrinsic mode functions (IMF) in the step (1); (3) determining an IMF set led by noise and an IMF set having different self-similarity features according to the fluctuation trend and sizes of the SE values; (4) superposing the IMF sets determined in the step (3) and having the similar self-similarity features to serve as ELM model training inputs, using temperature gradients at the temperature change rates corresponding to the group of output data as another input training ELM model, similarly, using different superposed self-similarity IMF and corresponding temperature gradients to generate different ELM models through training; (5) accumulating the multiple ELM models generated in the step (4) to obtain a final integrated multi-scale model.

The invention relates to a complex multi-pipeline system detection method. Mark points adhered to the surfaces of attachments in a to-be-detected pipeline system are used as the basis of industrial photogrammetry solution for later solution of inner and outer parameters of a digital camera; scales placed at the edges of the pipeline system or in other adjacent pipeline systems are used for carrying out corresponding solution on a pixel size of a camera and an actual length size of the camera in a physical coordinate system. According to the complex multi-pipeline system detection method disclosed by the invention, an optical measurement means is used; by image processing, two-dimensional pipeline identification is carried out; based on an industrial close-range photogrammetry principle, reconstruction of a three-dimensional pipeline is carried out. An image is used for carrying out data processing and the industrial photogrammetry principle is very high in three-dimensional reconstruction accuracy, and thus, only images at different angles need to be shot for complex pipelines; the complex multi-pipeline system detection method is simple and convenient to operate, and accuracy of pipeline detection is ensured.

This invention is based on electromagnetism lossless measurement theory and provides an impulse exciting electromagnetism resonance safety measurement method and its apparatus and belongs to electromagnetism lossless measurement technique field. This invention adopts transient high-energy impact excitation loop and establishes an attenuation resonance magnetism field. The detection loop is used to feel space magnetism field excitation and is connected with the alarming circuit through signal process circuit.

A soft measurement method for the remaining length of a melting electrode in an electroslag furnace is based on the complex force relationship of the electrode to obtain the soft measurement formula of the electrode length, and the soft measurement formula for the remaining length of the electrode is obtained according to the changing relationship of each position in the smelting process and the melting crystallization model. Due to the influence of interference factors and uncertain factors, a single weight prediction model or position prediction model is not accurate enough, so according to the multi-sensor measurement theory, the results of the two are fused, and a multi-sensor information fusion algorithm based on random weighted estimation is used. , which is used to solve the problem of optimal allocation of weights when multiple sensors measure the remaining length of electrodes. The invention belongs to the field of electroslag metallurgy, provides necessary conditions for the automatic electrode changing operation of a large electroslag furnace, can reduce waste of precious metal raw materials, reduce production cost and improve production efficiency. The method is characterized by safety, reliability, low cost and easy promotion.

The invention discloses a cloud evaluation system implementation method based on a QTI standard. The method comprises a cloud evaluation plug-in, a test question processing module, an evaluation module, a data analysis module and a visualized presentation module. A teacher obtains the test question data information and performs a pre-processing operation through the evaluation plug-in, generates atest question resource file based on the QTI standard, and then uploads the test question resource file to the cloud server. A student obtains the test question information and answers the test question. A system analyzes the student's answer data according to a classical measurement theory and a data mining algorithm based on an association rule, and displays an analysis result in the form of agraph. The method can provide teaching evaluation support for teachers and students. Through the data analysis of the evaluation results, the method objectively reflects the students' learning status,analyze and evaluates the quality of the test questions, is helpful to improve the teaching process plan, adjust the teaching focus, and grasp the teaching quality, and has great significance to theteaching of teachers and students.

The invention provides a miniature imaging type infrared temperature field measurement system, and the system comprises an infrared imaging module which is used for collecting infrared radiation of a measured object; N radiation homogenizing units which are used for the homogenizing of infrared radiation, wherein N is an integer greater than or equal to two; N single-wavelength filtering units which are corresponding to N radiation homogenizing units, wherein each single-wavelength filtering unit comprises M optical filters which are respectively used for obtaining the infrared radiation at different wavelengths, and M is the number of wavelengths; and an infrared detector which is used for detecting the infrared radiation at different wavelengths and outputting a measurement signal. The multi-wavelength radiation temperature measurement theory is applied to the system, thereby solving problems that a conventional miniature imaging type infrared temperature field measurement system is poor in anti-interference capability, and is poor in measurement precision.

An object of the present invention is to provide a method for measuring the dissociation rate coefficient (Kd) by surface plasmon resonance analysis without measuring the theoretical maximum amount of binding (Rmax). The present invention provides a method for measuring the dissociation rate coefficient (Kd) of the reaction between an analyte molecule immobilized on a metal surface and a molecule that interacts with the analyte molecule by assaying changes in surface plasmon resonance signals using a surface plasmon resonance measurement device, wherein the signal and the slope of the dissociation curve of the surface plasmon resonance signal curves, or the signal ratio are used to calculate the dissociation rate coefficient (Kd).

The invention relates to a precision lunar lander positioning method and a precision lunar lander positioning system capable of improving libration parameters. Initial data are inputted, and the approximate coordinates of a lander are adopted as the initial coordinates of the position of the lander; aiming at each baseline, theoretical observation values of delayed observations of VLBI (very long baseline interferometry) are calculated according to the initial coordinates of the position of the lander, partial derivatives of the delayed observations with respect to the position of the lander and partial derivatives of the delayed observations with respect to lunar libration parameters are calculated and compose a coefficient matrix, a model is jointly created aiming at the position of the lander and the lunar libration parameters, least square calculation is carried out aiming at the parameter vectors of the model, moreover, whether a calculation result meets a condition of convergence is judged, if so, then the result is outputted, and if not, then iteration is carried out again until the condition of convergence is met. On the basis of creating the observation module for VLBI observation data, the invention firstly puts forward and creates a new model which simultaneously estimates reference system connection parameters (lunar physical libration) and lander positioning parameters, thus remarkably increasing the positioning precision of the lunar lander.

The invention relates to the technical field of gear measurement, in particular to a double arm type measurement instrument of a super huge type gear. The double arm type measurement instrument of the super huge type gear comprises a base seat placed on the upper end face of a measured gear and three dimensional measurement units suspended below the base seat, wherein the number of the three dimensional measurement units is two, and the two three dimensional measurement units are respectively used to measure the inner side and the outer side of the measured gear. The double arm type super huge type gear measurement instrument adopts a measurement theory of using a small part to measure a large part, and overcomes the disadvantages that the measurement center of the super huge type gear and a coordinate measuring machine need long guide rails, instrument cost is high, and measurement accuracy is difficult to improve.

An online measurement hub compensation path generating method includes the following steps that (1) a hub assisting line and assisting points are generated by utilizing a hub model; (2) a measurement data file is generated, specifically, (2.1) measurement points in different directions are created through the assisting line and the assisting points, the measurement points include whole points used for whole hub compensation and window points used for local window compensation, and the whole points and the window points are obtained by creating the measurement points on a curve; (2.2) according to hub characteristics, measurement points of the rest of windows are created, and circumferential marshalling is conducted; (3) all the created measurement points are ranked in an optimized mode, and a path suitable for measurement is generated; and (4) according to measurement options, measurement theoretical data are calculated, and the measurement path is output and finally guided into a machine tool control system. According to the online measurement hub compensation path generating method, manual ranking is not needed, manual calculation is replaced with automatic calculation for compensation values, the using difficulty and calculation amount are reduced, manual input of theoretical compensation values is not needed, and efficiency is improved.

The invention provides a luminance detector, comprising a shell, a standard light source, a light source collecting unit, a photoelectric detector, a processing unit and a display unit, wherein the standard light source, the light source collecting unit, the photoelectric detector and the processing unit are arranged in the shell; the display unit is arranged outside the shell; the light source collecting unit and the photoelectric detector are arranged in sequence along the light path to be detected of a to-be-detected light source; and the light source collecting unit comprises a beam splitter prism, a small objective lens which is arranged between the beam splitting prism and the standard light source, a bandpass filter which is arranged between the beam splitting prism and the to-be-detected light source, and an imaging objective lens which is arranged between the beam splitting prism and the photoelectric detector. The luminance detector can be used for measuring the to-be-detected light source on the basis of a relative measurement theory, the usage range of the luminance detector can be effectively expanded, measurement can be carried out under a non-specified detection environment, and the influence of the noise and aging of the photoelectric detector on the luminance detection result is reduced. The luminance detector is small in size and light in weight.

The invention provides a simplified algorithm for the bending deformation of a cantilever thin plate under force, which can use a frame model composed of five beams to replace the cantilever thin plate, and complete the approximation of the cantilever thin plate by adjusting the stiffness of the five beams. Then get the empirical formula K corresponding to the stiffness of each beam and the position of any concentrated force Ff; when it is necessary to calculate the bending deformation of any point on the cantilever thin plate under the action of the concentrated force Ff, substitute the coordinates of the point into the obtained empirical formula K, to obtain the stiffness of each beam, and then calculate the bending deformation of the point, that is, to obtain the bending deformation of the point on the cantilever thin plate under the action of the concentrated force Ff; within the allowable range of engineering errors, compared with the traditional Finite element simulation, direct measurement, or direct solution with elastic mechanics theory, using the simplified algorithm of cantilever thin plate bending deformation under force, saves calculation time, thereby making timely deformation compensation during thin plate processing, and improving processing efficiency and quality.

The invention discloses a satellite gravity gradient determining method and system. The method includes: building the local north-oriented reference frame of a gravity gradient satellite; determiningthree base lines according to the local north-oriented reference frame; building a common-point orthogonal base line model according to the three base lines; determining satellite gravity gradient according to the common-point orthogonal base line model representing a satellite gravity gradient measuring theoretical model. By the method and system, the gravity gradient measuring satellite can be conveniently designed, the measuring errors and key technologies of the gravity gradient measuring satellite can be accurately and comprehensively analyzed, and satellite gravity gradient determining precision is increased.

The invention discloses a measuring device for impact bending and pulling damage of concrete based on non-equilibrium state, which is characterized in that it includes an air gun, a bullet, an incident rod, a transmission rod, a strain gauge, a bridge box and a data acquisition system connected with a computer, Strain gauges are pasted in the middle of the incident rod, and the strain gauges are connected to the data acquisition system through the bridge box. Set up sleeves on the incident rod and the transmission rod respectively. Blocks are set on the sleeves, and the concrete specimen is clamped on the two rods. between pads; a kind of measuring device and measuring method based on non-equilibrium concrete impact bending and tensile damage of the present invention introduces the concrete damage theory into the measurement of bending concrete damage under impact load, and overcomes the impact load under impact load. Due to the difficulty of short failure time of bent concrete, the relationship curve between the tensile strength and failure time of concrete when it is bent is obtained; the difficulty of measuring the transmitted wave in the test is overcome, and the error is greatly reduced when the wave is superimposed.

The invention belongs to the technical field of data processing in the contour measurement theory and relates to a filtering method for contour line data. The filtering method for the contour line data comprises the following steps: 1) performing the spline filtering to the original measurement data to obtain the filter centerline data; 2) solving weight judgment values corresponding to each data measurement point; 4) setting constant parameters, and comparing the weight judgment values vi of each point with the constant parameters to solve the weight values of each point; 5) recognizing the data of singular values according to the weight values, judging the points with the weight values of 0 as the data points of the singular values, and marking the range of the abnormal data; and 6) replacing the other points in the range of the data of the singular values by the average value of the data of the two data boundary points to obtain a set of new data without the data of the singular values, and performing the cascaded approximating Spline filtering to the new data to obtain the final filter centerline data. The filtering method for the contour line data can stably filter the contour line data.