47results about How to "Reduce offset error" patented technology

A motor control apparatus of the present invention comprises a velocity detector for detecting a rotation velocity of a mover of a motor, a position detector for detecting a position of the mover, a differentiator for performing time differentiation with respect to the position detected by the position detector to obtain a velocity calculation value, a feedback signal generating circuit for generating a feedback signal including the velocity detection value obtained by the velocity detector as a high frequency component and the velocity calculation value obtained by the differentiator as a low frequency component, and a linear amplifier and an integrating amplifier for performing PI control, the linear amplifier and the integrating amplifier performing linear amplification and integrating amplification of a difference between the velocity instruction and the feedback signal, respectively.

Differential stage voltage offset trim circuitry involves the use of one or more trim circuits, each of which is dedicated to trimming one particular source of voltage offset (V_os) error for a “main” differential pair. One trim circuit may be dedicated to trimming V_os error that arises due to mismatch between the main pairs' threshold voltages, and another trim circuit may be dedicated to trimming V_os error that arises due to mismatch between the main pairs' beta values. Another trim circuit can trim V_os error due to gamma mismatch between the main pair transistors, and respective trim circuits can be employed to trim V_os error that arises due to threshold mismatch and/or beta mismatch between the transistors of an active load driven by the main pair. Several trim circuits may be employed simultaneously to reduce offset errors that arise from each of several sources.

The invention discloses a DEM-auxiliary-intensity-related glacier surface motion three-dimensional vector inversion method, and relates to the technical field of glacier motion monitoring. Lifting rail SAR image pairs are registered at high precision based on a high-precision DEM, and then displacement observation results in four different directions of a glacier area are obtained by utilizing satellite-borne SAR amplitude information and applying an offset tracking technology; and shadowing and layover areas with the threshold value lower than the offset tracking relativity threshold value are masked, according to the SAR image forming geometrical relationship, the functional equation system between the deformation observation results of the four directions and three-dimensional motion components of three glaciers in the east-west, south-north and vertical directions is built, the three-dimensional motion components are calculated, and then the actual flowing speed and direction of the surfaces of the glaciers are obtained. Actual three-dimensional motion on the surfaces of the glaciers is inversed only through satellite-borne SAR, when the terrain is steep and an SAR image spacebase line is large, the offset error is lowered, and the precision of the offset tracking result is improved.

The invention provides a docking and positioning calibration method based on an AGV and an AGV. The docking and positioning calibration method based on the AGV comprises the steps of obtaining a real-time positioning parameter of a laser positioning part mounted on the an AGV body when the AGV reaches a preset position or the AGV stops moving; comparing the real-time positioning parameter with a standard positioning parameter corresponding to the preset position so as to obtain an offset error; when the offset error is not within an allowed error range, obtaining current data of an encoder ina steering engine driving assembly part of the AGV; and controlling the steering engine driving assembly part to drive a steering wheel of the steering engine driving assembly part to run and/or steeraccording to the offset error and the current data of the encoder till the offset error is within the allowed error range. According to the docking and positioning calibration method based on the AGVand the AGV provided by the embodiment of the invention, an automatic driving route of the AGV can be adjusted for calibration and positioning so that the positioning of the AG is more accurate to reduce an error between the AGV and a storage rack during docking; and therefore, the operation accuracy of the AGV during taking and putting goods or materials is improved.

The invention discloses a high-efficiency plate positioning and cutting device, which relates to the technical field of wood processing equipment and includes a base, a plate clamping device and a cutting device. The base is provided with a guide rail, and a driving trolley is provided in the guide rail. The cutting device includes a cutting motor and a cutting device. The blade and the cutting motor are installed on the driving trolley, and a symmetrical vertical bracket 1 is arranged above the driving trolley. There is a photoelectric switch group and the power-off switch group is arranged symmetrically on both sides of the guide rail. The present invention controls the drive trolley to perform linear reciprocating motion through the signal of the photoelectric switch group, so that the cutting blade can cut the board multiple times, which improves the cutting efficiency. The flatness of the surface, the clamping of the plate is realized by the cylinder, the offset error caused by the mechanical vibration is reduced, and the cutting accuracy and cutting efficiency of the large-size plate are improved.

The invention belongs to the technical field of modern optical measurement and manufacture and particularly relates to a real-time grinding and polishing method based on a dynamic interferometer. The real-time grinding and polishing method comprises the specific steps: (1) according to the placement position coordinate of a workpiece, the equation of a curved surface to be measured and the sizes of corresponding hole diameters measured by the dynamic interferometer at different measuring distances, software is utilized for analyzing the number, the sizes, the positions and the moving paths needing to be measured by the dynamic interferometer; (2) measurement and processing of sub hole diameters are carried out on the curved surface to be measured by a polishing component or the interferometer according to the set measuring path, the measured surface shape data are used for determining the residence time in the measured sub hole diameters and the setting of the moving trail of a grinding head in real time; (3) after washing and blow-drying the surface shape in the range of the measured hole diameters, the workpiece is polished/ground by an industrial robot. The real-time grinding and polishing method has the advantages that the cost of a used system is low, the universality and the practicability are good, dynamic online measurement and processing of multiple surface shapes can be realized and the polishing accuracy and the conformity of the polished surface shapes are high.

The invention provides a three-dimensional shape characterization method for a gear tooth surface in real grating projection. The method uses a plane moving grating to introduce a uniform phase shiftfor the measurement field of view, and constructs a random phase shift technique to eliminate the offset error in the phase demodulation process. The method uses the phase as the measurement feature,and uses its invariance characteristics to construct a phase-height difference look-up table to quickly recover the three-dimensional measurement surface, and finally provides a way to construct a fast, high-precision gear three-dimensional contour measurement technology. The method of the invention provides an effective way for non-contact measurement of spur gears and helical gears.

The invention discloses an analog-to-digital conversion device with substrate temperature compensation for an infrared focal plane. The analog-to-digital conversion device comprises a substrate temperature acquisition and correction module and a comparator module with substrate temperature compensation, and the comparator module with the substrate temperature compensation function comprises a comparator and a current type DAC. The substrate temperature acquisition and correction module acquires substrate temperature data of the infrared focal plane array and extracts corresponding related correction parameters based on the substrate temperature data; the substrate temperature acquisition and correction module applies the related correction parameter signal to a current type DAC, and the current type DAC regulates and controls the tail current of the comparator based on the related correction parameter signal to perform substrate temperature compensation. According to the scheme, the substrate temperature acquisition and correction module is additionally arranged based on the comparator, compensation of the substrate temperature of the comparator is realized by matching with the current type DAC, the problem of inconsistent overturning delay of the comparator caused by different temperatures is effectively eliminated, the offset error of the analog-to-digital converter is reduced, and the precision and the signal-to-noise ratio of the conversion device are improved, so that the uniformity of an output image is improved.

The invention relates to the field of image data processing, in particular to a large vehicle panoramic stitching method, which comprises the following steps: acquiring video data of at least one camera, and preprocessing based on the type of the camera to obtain a video frame; obtaining processing data based on image feature point matching of the video frame; horizontally splicing the processed data; and outputting the spliced image. One or more cameras are arranged so that all data of the appearance of a large vehicle can be obtained, a wide-angle camera is generally adopted for one camera, and a flat-angle camera is generally adopted for multiple cameras, so that corresponding video images can be matched to obtain processing data of a video frame with a complete section of the vehicle, and then horizontal splicing is carried out to obtain the complete appearance of the vehicle, so that the vehicle can be better shot and processed, and the measurement and detection efficiency is improved.

The invention discloses a local back surface field passivation contact cell and a preparation method thereof. The cell comprises a silicon wafer main body, a boron diffusion layer, a front passivation film, a positive electrode, a tunneling oxide layer, a field passivation layer, a back passivation film and a back electrode; the boron diffusion layer, the front passivation film and the positive electrode are sequentially laid on the front surface of the silicon wafer main body; the tunneling oxide layer, the field passivation layer, the back passivation film and the back electrode are sequentially laid on the back surface of the silicon wafer main body; and the field passivation layer is provided with a first region and a second region which are different in doping concentration. The field passivation layer is provided with the first region and the second region which are different in doping concentration, the first region is in contact with the back electrode of the cell, namely a metal contact area, the high doping concentration is achieved, and it is guaranteed that the first region has small electrode contact resistance and electron tunneling resistance; and the second region is not in contact with the back electrode of the cell, namely a non-metal contact region, so that the doping concentration is relatively low, auger recombination of the non-metal contact region is reduced, parasitic absorption of the non-metal contact region is further reduced, and the conversion efficiency of the tunneling oxidation passivation contact cell is improved.

The invention relates to a device for processing a side pin hole of a front shaft. According to the device, a first power feed unit (3) and a second power feed unit (6) are arranged on two sides of a combined lathe bed (1) respectively; a first short-hole drill (4) and a second short-hole drill (5) used for processing the side pin hole of the front shaft are arranged on the first power feed unit (3) and the second power feed unit (6) respectively; a tool (2) is arranged on the combined lathe bed (1), and is positioned between the first short-hole drill (4) and the second short-hole drill (5); and a workpiece (7) is clamped on the tool (2). The device solves the problem of cutter relieving displacement due to one side cutting when processing the side pin hole of the front shaft, accurately and efficiently controls the form and location deviation of two through holes, reduces the labor intensity of a worker, improves the working efficiency, and improves the product quality.

The invention provides a pit structure mounting method which comprises the following steps: supplying a second upright column, and embedding the second upright column into the bottom of a foundation pit; supplying a bottom plate, and arranging the bottom plate at the bottom of the foundation pit to cover the second upright column; supplying a first upright column, enabling the first upright column to penetrate through the bottom plate, and inserting the first upright column into the second upright column; supplying a supporting plate, and horizontally arranging the supporting plate at the top end of the first upright column; fixedly arranging a pit bearing platform on the top of the supporting plate; and supplying a connecting mechanism, and fixedly connecting the connecting mechanism with the top of the pit bearing platform. When the pit structure mounting method is used for excavating the foundation pit, a fixing mechanism is arranged in a reserved space at the lower part of the pit bearing platform, and the pit bearing platform is supported by the supporting plate, so that the lower part of the pit bearing platform is effectively supported, steadiness of the pit structure mounting method is guaranteed, the pit is prevented from collapsing, the safety hidden dangers are eliminated and the like.

The invention discloses a time offset estimation method and system for an NR uplink control channel. The method comprises the following steps of: acquiring a PUCCH (Physical Uplink Control Channel) receiving signal extracted in a current time slot of a base station; performing conjugate multiplication operation on the signal and a local spread spectrum sequence of a current symbol frequency domain code channel 0 to obtain a conjugate receiving signal; separating pilot frequency from data; removing an OCC sequence; the pilot frequency and data correlation peak indexes are averaged, the time offset value of each user is calculated, and the method effectively improves the time offset estimation precision of the PUCCH multi-user multiplexing scene.

The invention discloses a fitness equipment intelligent control device based on a servo technology. The fitness equipment intelligent control device comprises a fitness equipment frame, a servo motor,a servo motor driving unit, a sensor, a servo motor connector, a touch display, a fuzzy controller, a control circuit and a human-computer interface. In the aspect of user experience, due to the factthat the actual torque offset is reduced, the offset error is reduced, a user pulls the servo motor to run more smoothly in the exercise process of using the fitness equipment, and the stagnation feeling before a fuzzification algorithm is applied is eliminated.