94results about How to "Error controllable" patented technology

A device for measuring the mass center of an object consists of weighing sensors, a measuring table, a tribrach, supporting legs and a computer. Three height adjustable supporting legs are arranged below three feet of the tribrach, three weighting sensors are arranged on the three feet, the three weighting sensors are accurately positioned, and the position points are respectively A, B and C which take an equiangular triangle distribution; the measuring table is arranged on the three weighting sensors, and needs leveling during measurement, the table is marked with marking scales, and rectangular coordinates are established; and three protective supporting studs are also arranged between the tribrach and the measuring table. The three points of A, B and C bear different forces when an object to be measured is put on a horizontal table, the 2D coordinates of the mass center of the measured object are obtained by moment balance calculation, and the 3D coordinate of the mass center can be obtained only by measuring the 2D coordinates of the mass center after the measured object is turned by 90 degrees. The mass center can be obtained quickly and reliably by adopting the computer to acquire and process data.

The invention discloses an error-controllable subdivision surface image vectorization method, and the method comprises the following steps: 1), detecting the edge features of an image, and obtaining an initial image feature line segment with the one-pixel width; 2), constructing an initial grid based on the image features, and marking the image features in the grid; 3), simplifying the initial grid, and constructing a base grid maintaining the image features; 4), carrying out the error-controllable Loop subdivision surface fitting, and obtaining a control grid; 5), carrying out the rasterization vector expression. The method can obtain a better vector image through a raster image. If the error of an initial reconstruction result cannot meet the demands of a user, the method can measure the error of a vectorized reconstruction image and an original image. The adaptive subdividing of the base grid is used for achieving a specific error in a certain range, thereby achieving the error controllability. The method employs the subdivision surface technology for image vectorization, and aims at the conversion of the raster image to the vector expression meeting the error requirements, and has the practical value.

The embodiment of the invention relates to an identification method of long flows and a measuring method of data flow and a device thereof, wherein the identification method of long flows comprises assuring term number of business flow to be 1, wherein each term is corresponding to a prior counting type Blum filter, doing hash calculation for each term, generating hash address of each prior counting type Blum filter which is corresponding to each term, searching for a counter which is corresponding to each hash address which is corresponding to each term, circulating a counter which is corresponding to each prior counting type Blum filter, and judging the business flow is one long flow if the value of each counter in each term is bigger than and is equal to a preset threshold value or circulating time of a counter corresponding to each term is equal to the number of the prior counting type Blum filter, and returning to the step of confirming the term number of business flow to be 1 after adding 1 to the value of each counter in each term. The embodiment of the invention achieves the identification and statistic to long flows which are on line in real time in high-speed network, and is suitable for flow measuring requirements in high-speed network.

The invention provides a satellite-borne clock redundant system and method. The satellite-borne clock redundant system and method are used for providing a system clock for a spaceflight control system. According to the system and method, an external high-accuracy clock and two internal clocks sources of which are not the same serve as a main clock, a backup clock and a third-party clock respectively, the third-party clock can be adopted for arbitration only when the main clock and the backup clock are inconsistent, single-redundancy faults of the clock can be allowed, the tri-redundancy aim is achieved, implementation is simple, and cost is low. According to the satellite-borne clock redundant system and method, the clock redundancy function of a control system is achieved through the high-accuracy clock of an inertia unit and the two clocks in a flight control computer, the high-accuracy clock of the inertia unit is sufficiently used, influences of faults of the clock on running of the control system are avoided, the reliability and the safety of the control system can be improved, and the satellite-borne clock redundant system and method have the advantages of being low in implementation cost and facilitating engineering realization.

The invention discloses a method for monitoring resistance of valve discs of arresters based on a resistance-capacitance network. The method includes the first step of building an arrestor three-dimensional resistance-capacitance network model based on a three-dimensional finite element static electric field, the second step of solving partition capacitance between the arrestors and capacitance of the valve discs of the arresters, the third step of installing leaked current measurement devices on flanges at the lowest ends of the arresters operating on site, and obtaining actual leaked current measurement values and actual phase angle difference measurement values of the arresters, and the fourth step of solving resistance of the valve discs of the arresters in an iteration mode. The resistance valve of the valve discs of the arresters in operating states can be accurately obtained in the method, errors are controllable, requirements of a project can be met, operation conditions of the arresters are directly and effectively monitored, and meanwhile accurate data references an be provided for power grid operation and maintenance staff; the method is suitable for being used for monitoring a high-voltage zinc oxide arrestor on line.

The invention relates to a composite feedforward control type hysteresis control system. The composite feedforward control type hysteresis control system comprises input voltage Vi, a main switch tube, a filter circuit and a load Ro all of which are sequentially connected. The main switch tube is connected with a driving circuit. The composite feedforward control type hysteresis control system further comprises a feedback bypass, an adjusting capacitor C, a hysteresis comparison circuit and a feedforward circuit. The feedback bypass is respectively connected with the main switch tube and the load Ro, the adjusting capacitor C is connected with the feedback bypass, the input end of the hysteresis comparison circuit is respectively connected with the adjusting capacitor C, the feedforward circuit and the main switch tube, the output end of the hysteresis comparison circuit is connected with the driving circuit, and the feedforward circuit is connected with the input voltage Vi. Compared with the prior art, the composite feedforward control type hysteresis control system has the advantages of being good in dynamic characteristic, simple in control circuit topology, low in cost, high in efficiency and the like.

The invention discloses a method for preventing the surfaces of disc cams from generating gear marks, comprising the following steps of: after measuring the discrete point data [pmrho m, theta m] (wherein rho pm is the mth cam lift data, and theta m is the mth sampling angle value) of the profiles of mother wheels of the disc cams by utilizing a cam precise measurer, judging whether positions capable of generating the gear marks exist or not by using the discrete point data of the profiles of the cams, if the positions capable of generating the gear marks exist, reducing the second-order variation of the lift data by carrying out a smooth moving method on the first-order variation of the lift data of each cam to eliminate the gear marks; and if the positions capable of generating the gear marks still exist in the discrete point data through the operation, carrying out further gear mark elimination on the data obtained in the last step through a multi-time cubic spline interpolation method until the second-order variation of the lift data achieves meets the requirements of thresholds, and then inputting the new discrete point data to a numerically controlled grinder for processing the cam. By adopting the method, the disc cams with smooth and precise profiles can be obtained.

The invention provides a digital three-way displacement measuring device for expansion monitoring of thermal equipment, which consists of a three-way reflector composed of three mutually perpendicular plates fixed on the object to be monitored, and a three-way laser fixed on a relatively static point. Composed of ranging sensors and soft dust-proof shields, it realizes the digitalization and precision of the detection process. The detection process is basically not affected by changes in environmental factors. The measurement accuracy is high and the data is stable and reliable. There is no zero drift problem in long-term operation; A method for controlling errors during on-site installation.

The invention relates to artificial intelligence, and discloses an animal weight measurement method, device, equipment and medium based on image detection, and the method comprises the steps: selecting a checkerboard with a set specification as a calibration object; placing a calibration object in the middle of the position under the animal to be measured, and obtaining an image of the animal to be measured and the calibration object as a whole; detecting a to-be-detected animal in the image, and correcting the scale of the to-be-detected animal according to the checkerboard to obtain an imageonly comprising the to-be-detected animal; and inputting the image only including the to-be-detected animal into the weight estimation model, classifying the to-be-detected animal according to the weight categories through the weight estimation model, obtaining the probability that the to-be-detected animal belongs to each weight category, and calculating the weight of the to-be-detected animal according to the probability that the to-be-detected animal belongs to each weight category. The method is convenient to operate, does not depend on equipment, is controllable in error, and can improvethe efficiency of animal weight measurement.

The invention discloses a nondestructive detection method for the thickness of a nacrelayer of a pearl. The nondestructive detection method comprises the following steps of gradually irradiating two objects to be detected through an X-ray radiation source to acquire two initial images; judging whether a pixel point is a boundary point according to a gray value of the pixel point, thus identifying all the boundary points of the images of the objects to the detected according to the initial images; for a standard sphere, fitting a circle by using the identified boundary points, and setting the radius of the circle as the radius R0 of an image of the standard sphere; for the pearl to be detected, fitting three concentric circles by using the identified boundary points, wherein the radius of the circle positioned at the center is used as the radius R2 of an image of a pearl kernel, and the radius of the circle positioned on the outmost side is used as the radius R1 of an image of the pearl to be detected; the radius r1 of the pearl to be detected is equal to mu R1, and the radius r2 of the pearl kernel is equal to mu R2, thus the thickness r of the nacrelayer is obtained by subtracting r2 from r1; a proportion coefficient mu is equal to r0/R0; r0 is the radius of the standard sphere. According to the nondestructive detection method, the calculation of the thickness of the nacrelayer is realized, and a measurement result is more accurate.

The invention discloses a thermal expansion valve, which comprises a driving piece, a valve body, and a driving rod and a spool which are arranged in the valve body, wherein the top end of the spool is in contact fit with the lower end of the driving rod, the driving piece is provided with an adjusting piece at a position which is adjustable along the moving direction of the driving piece, and the top end of the driving rod is in contact fit with the lower end of the adjusting piece. The influence of the machining and assembling errors of the thermal expansion valve to a diaphragm is minimized, the position of the diaphragm is highly consistent when the spool is fully closed and the working performance of the thermal expansion valve is greatly improved. The invention additionally discloses an assembling method for assembling the thermal expansion valve.

The invention discloses a crop grain character measuring method. According to the method, the length, the width, the grain number and the thousand grain weight of crop grains can be rapidly measured and calculated in batches. The method comprises the following steps that 1, assembling a computer, a usb camera, a light-emitting table and a non-transparent box body to construct a crop grain measuring platform; 2, weighing a sample, and spreading and paving the sample on a light-emitting table; 3, writing a program, and sequentially completing data file establishment, blank image acquisition, length calibration, grain image acquisition, sample name and weight entry, image processing and segmentation, connected domain judgment and error correction, measurement data output and the like; automatically completing image analysis and data output after the name and weight of the sample are input by a program, whereinonly a few seconds are needed; measurement results are directly output in a format recognized by office and statistical software and used for further arrangement and statistics. The method has the advantages of being low in cost, easy to operate, rapid, accurate, high in practicability and extremely easy to maintain.

The invention discloses a sliding frame structure in construction of large-area multi-column-point supported reticulated shells. The sliding frame structure is characterized in that sliding rails are arranged in parallel on the ground of areas where the planar projection of a roof reticulate shell is in. A span is formed between two adjacent longitudinal structure columns, the distance between two adjacent transverse structure columns is a column distance, and an among-span unit steel pipe scaffold is arranged independently within one column distance range among the spans. Among-span unit steel pipe scaffolds are supported on the sliding rails which are arranged in parallel and can move along the sliding rails, and an operation platform is arranged on the top portions of the among-span unit steel pipe scaffolds. According to the sliding frame structure in construction of large-area multi-column-point supported reticulated shells, the construction of large-area multi-column-point supported reticulated shells is economic, and the construction period is shortened.

The invention discloses a nondestructive detection method for the thickness of a nacrelayer of a pearl. The nondestructive detection method comprises the following steps of placing a standard sphere between an X-ray radiation source and an imaging plane to allow a sphere center of the standard sphere to be positioned on a reference straight line; irradiating the standard sphere through the X-ray radiation source to acquire an image of the standard sphere on the imaging plane, measuring the radius R0 of the image of the standard sphere, and calculating a proportion coefficient mu=r0/R0, wherein r0 is the radius of the standard sphere; placing the pearl to be detected between the X-ray radiation source and imaging equipment to allow the sphere center of the pearl to be detected to be positioned on the reference straight line; irradiating the pearl to be detected through the X-ray radiation source to acquire an image of the pearl to be detected on the imaging plane, wherein the image of the pearl to be detected comprises an image of a pearl kernel and an image of an annular nacrelayer; measuring the radius R1 of the image of the pearl to be detected and the radius R2 of the image of the pearl kernel, wherein the radius r1 of the pearl to be detected is equal to mu R1, the radius r2 of the pearl kernel is equal to mu R2, and the thickness r of the nacrelayer is obtained by subtracting r2 from r1. Errors in a calculation process based on the nondestructive detection method are controllable, and a measurement result is more accurate.

The invention discloses an elevator car load device correction method which includes the steps: recording the weight of an elevator counter-weight and car empty weight; acquiring the weight corresponding to output torque; comparing the sum of the car empty weight and the weight corresponding to the output torque with the weight of the elevator counter-weight to obtain car internal load calculationweight; acquiring car internal load weighing weight; judging whether the car internal load calculation weight and the car internal load weighing weight have deviation or not; comparing the car internal load calculation weight with the car internal load weighing weight to obtain correction coefficient if the car internal load calculation weight and the car internal load weighing weight have deviation; compensating the correction coefficient into a weighing device calculation module to correct an elevator weighing device. The elevator car load device correction method is used for correcting thedeviation of the elevator weighing device, elevator weighing accuracy and elevator running comfort are improved, and the elevator car load device correction method has good economic benefits.

The invention relates to a determination method for the dispersity of dust in air of a working field. The determination method comprises the following steps: preparation of a dust suspension solution according to GBZ/T192.3-2007 and ocular lens micrometer calibration; preparation of a dust sample, namely inflating the uniformly-mixed dust suspension solution into a counting tank of a blood counting plate; standing and depositing dust grains at the bottom of the counting tank; dispersity determination, namely taking off an objective lens micrometer and putting the blood counting plate into which the dust sample is dropped on an objective table; finding out the dust grains by using a low-power lens; observing with magnifying power by a calibration ocular lens micrometer; selecting four corners of a large square cell at the center of the counting tank and five middle square cells at the center of the counting tank; sequentially determining the size of each dust grain by using the objective lens micrometer; measuring a long diameter when meeting a long diameter amount and measuring a short diameter when meeting a short diameter amount; and recording by groups and calculating the percentage. According to the determination method, a blood counting plate method is used for determining the dispersity of the dust so as to effectively avoid the error caused by human factors of smearing and measuring links in a previous method, and guarantee the accuracy of a determination result.

The invention provides an investment casting process of a metal product. The investment casting process comprises the following steps: S1, producing a forming mold; producing a corresponding forming mold according to the size of a workpiece of the metal product; S2, producing a shell: producing a shell according to the forming mold in S1; S3, pouring: pouring a metal liquid into an inner cavity of the shell; S4, discharging: removing the shell after the metal liquid is solidified, and discharging the formed metal product. The investment casting process of the metal product is simple in flow, convenient to operate and high in production efficiency. The shell conforming to the requirement can be manufactured according to the size of the metal product, the error of the shell is controllable, and the problem of excessively large tolerance can be avoided.

A code-overlapped fast-hopping optical CDMA access system is disclosed. The light source is directly modulated by the data bit of user terminal in optical coder. The generated broadband optical pulses pass through optical loop channel and then into optical fibre raster and optical fibre delay array. The data pick-up circuit in conventional IM/DD digital optical transmission system is used to pick up the data bits. Its advantages are simplified system structure, free addressing, high security, less loss of optical power, high bit rate and throughput of user information and low cost.