179results about How to "Small margin of error" patented technology

The invention relates to a mobile robot positioning system and a method based on the plurality of the two-dimensional code readers. The mobile robot positioning system and the method are characterized in that the positioning system comprises a two-dimensional code positioning controller mounted on a mobile robot trolley, at least two two-dimensional code readers and two-dimensional code tags which are distributed on the ground, the two-dimensional code positioning controller is composed of a microprocessor and a communication interface which is connected with the at least two two-dimensional code readers; and the positioning method includes building three coordinate systems, calculating a deviation angle of the mobile robot trolley in a trolley coordinate system relative to a central point connection line of two two-dimensional codes, calculating a deviation angle of the central point connection line of two two-dimensional codes relative to a world coordinate system and calculating a deviation angle of the mobile robot trolley relative to the world coordinate system to obtain an accurate position of the mobile robot. According to the mobile robot positioning system and the method, the design is reasonable, an accurate positioning function for the mobile robot is achieved, and advantages of high accuracy and stability, implement convenience and the like are provided.

The invention discloses an intelligent prestressing force stretching system, and relates to the technical field of prestressed girder stretching equipment in engineering construction of railroads, roads, municipal bridges and the like. The intelligent prestressing force stretching system comprises an intelligent stretching lifting jack and stretching pump stations, wherein at least two stretching pump stations are provided; the stretching pump stations are respectively connected with an oil inlet and an oil return opening of the intelligent stretching lifting jack through high-pressure oil pipes; a data cable of a control system of the stretching pump station is connected with a displacement sensor of the intelligent stretching lifting jack; and electromagnetic proportioning valves are arranged on oil lines of valve bodies of the stretching pump stations. Compared with the prior art, the pump stations are variable capacity oil pumps, the variable quantity is small flow rate when the stretching control pressure intensity is approximated, the accuracy can be ensured effectively when the preset stretching pressure value, the control accuracy of the stretching control pressure intensity Mpa is less than or equals to 0.5 percent, the control accuracy of the stretching elongation value is less than or equals to 0.5 percent, both the stretching control pressure intensity Mpa and the stretching elongation value are controlled by a computer automatically and accurately, the result of the stretching elongation value is obtained through automatic calculation, and the error range is narrowed from the conventional stretching range value down to the range value ranging from minus or plus 1 percent, wherein, the conventional stretching range value ranges from minus or plus 15 percent.

The invention discloses a description and evaluation method for spatial distribution of sand bodies, of a seismic attribute, in a clastic rock reservoir. The method comprises the following steps that 1) batten interpolation and encrypted sampling are carried out on post-stack seismic data to obtain encrypted sampled seismic data; 2) according to sensitive relations between the seismic attribute and lithology, pore permeability and petroliferous performance, a seismic attribute combination is optimized, and an integrated seismic attribute is obtained; 3) spatial distribution of dessert sand bodies is identified according to the integrated seismic attribute; and 4) spatial distribution of dessert sand bodies is combined, and a logging porosity and the petroliferous performance are calibrated to realize identification and integrated evaluation for sand bodies of the clastic rock reservoir. According to the method, features of the seismic attribute data calibrated by the logging data are considered in an integrated manner, technologies of logging data calibration, batten interpolation and encrypted sampling of seismic data, seismic attribute extraction and analysis on slicing zero points of the attribute are applied comprehensively, the thickness and physical parameters of the sand bodies of the seismic attribute are evaluated, and the prediction and evaluation precision of the sand bodies of the reservoir are improved.

The invention provides a detection method and device of the resonance frequency of an ultrasonic transducer and the ultrasonic transducer. The detection method of the resonance frequency of the ultrasonic transducer comprises the following steps that 1, in a frequency sweeping process, a current value change state of an excitation signal output loop in the ultrasonic transducer is detected; 2, a first frequency value of the ultrasonic transducer when the ultrasonic transducer works to the anti-resonance point is determined according to the current value change state; and 3, calculating is carried out to obtain a second frequency value according to the preset frequency width and the first frequency value of the ultrasonic transducer, and the second frequency value is taken as the working frequency of the ultrasonic transducer. Compared with the prior art, the accuracy that the working frequency detected by the detection method is the resonance frequency of the ultrasonic transducer ishigher. In addition, the detection device and the ultrasonic transducer corresponding to the detection method have the same functions and effects.

The invention provides an indoor fingerprint positioning method based on interpolation. The method comprises the following steps: 1, performing Kalman filtering processing on a to-be-processed RSSI (received signal strength) value on a known position; 2, performing optimized unbiased linear estimation on the RSSI value on an unknown point in the positioned region according to the processed RSSI sample on a known position by using a Cokriging interpolation algorithm; 3, repeating step 1 and step 2 on all beacon nodes, and joining all one-dimensional fingerprint vectors to successfully construct a multi-dimensional fingerprint vector in the positioned region; 4, calculating cells corresponding to former number vectors from high to low by using a vector similarity matching algorithm, namely the node positioned range; and 5, classifying the former number of cells by adopting a K-medoides clustering algorithm, and extracting the cluster head (the geometric center of a cluster) with the largest number of cells to serve as actual positioning result of nodes to output.

The invention belongs to the underwater sensing field, and especially relates to a sensitivity testing apparatus for a hydrophone. The apparatus comprises a shake table, a rigid wall circular pipe containing a measure medium, an accelerometer, a support and a computer, wherein one end of the rigid wall circular pipe is open and the bottom of the rigid wall circular pipe is fixedly connected onto the shake table and is fixed with the accelerometer. The hydrophone which needs to be tested is hanged on the support and perpendicularly hanged on central axis of a liquid column of a container. The computer controls the shake table through a signal-generator and a power amplifier. An output signal of the accelerometer and an output signal of the hydrophone which needs to be tested are sent into the computer after conditioning respectively by two signal conditioning circuits. The computer computes the sensitivity of the hydrophone based on the value of the two input signals. The invention can reduce the error range and raise the accuracy of sensitivity testing.

The invention discloses a speech adversarial sample generation method, which comprises the steps of reading input speech data, performing preprocessing operation on the input speech data, and extracting a speech feature value of the input speech data; loading a deep neural network model and parameters of the DeepSpeech speech recognition system; meanwhile, the extracted speech characteristic valueis input into a DeepSpeech speech system; calculating probability distribution of a recognition result of each frame of input speech data, initializing an error value and an error threshold value according to CTC Loss between the result and a given target value, and performing clamping operation on the error value and the generated adversarial sample; constructing a loss function of a speech adversarial sample generation algorithm, iterating for multiple times, and updating an error value; and if the identification result of the generated adversarial sample is a given target value, reducing an error threshold to update a threshold error, continuing iteration until iteration is finished, and outputting a result. The similarity between the adversarial sample generated by the algorithm and the original sample is higher.

A method for positioning a portable communication device, which adopts a server device to position the portable communication device, comprises the following steps: firstly, the server device receives the identification data and the signal intensity of a base station, which is detected by the portable communication device; the server device determines the regional characteristics of the region, in which the portable communication device is currently positioned, based on the identification data and the signal intensity of the base station; and then, the server device calculates the positioning coordinate, at which the portable communication device is positioned, and regulates the positioning coordinate based on the regional characteristics, thereby greatly improving the positioning accuracy.

A sensor circuit for obtaining physical quantities with a small margin of error even when the temperature varies is provided. The sensor circuit includes a sensor, a sampling circuit for obtaining a voltage value or a current value of a signal output from the sensor during a predetermined period and holding the value, and an analog-to-digital converter circuit for converting the held analog voltage value or current value into a digital value. The sampling circuit includes a switch for obtaining the voltage value or the current value and holding the value. The switch includes a transistor including an oxide semiconductor in a channel formation region.

The invention relates to a method for constructing an upper conduit frame of a six-pile conduit frame. The construction method comprises the steps of first segmenting the upper conduit frame: dividing the conduit frame into seven segments in total, wherein a main barrel is independently a segment and is marked as D01, with a weight of 157 tons; inclined strut steel pipes, horizontal supporting steel pipes and pile sleeves form six L-shaped segments, correspond to steel pipe pile, and are sequentially marked as G01, G02, G03, G04, G05 and G06, and the single segment weighs 59 tons. The construction method comprises the steps that steel plates are inspected after arriving; and according to a jacking diagram, the steel plates are subjected to blanking, lineration and groove cutting, steel plate machining edge rolling, cylinder splicing, assembly welding, jig frame manufacture, segmenting pre-folding, segmented handing over for examination and segmented coating. The method has the advantages that horizontal type pre-assembly is performed; by segmented manufacture of the main barrel and a supporting pipe, the inclined strut steel pipes are divided into two segments to be pre-assembled, finally the size of each segment is determined, and the precision is high; vertical type folding is performed, and the method facilitates final assembly.

The invention discloses an indoor positioning system used for positioning a target object. The target object can transmit wireless base station signals. The indoor positioning system comprises a plurality of receivers, a processor and a database, wherein each receiver comprises an omnidirectional antenna and a plurality of directional antennas, and the omnidirectional antenna and the directional antennas are used for scanning the wireless base station signals sent by the target object; the processor is connected with the target object and the receivers and used for processing the wireless base station signals scanned by the receivers to obtain the positioning result of the target object and transmitting the positioning result back to the target object; the database is connected with the processor and used for storing position information of the positioned target object. According to the indoor positioning system, an intelligent handheld device of a user serves as an Access Point transmitting end, the receivers provided with the omnidirectional antenna and the directional antennas are arranged in the environment and used for detecting the intensity of signals of the intelligent handheld device, and most appropriate positioning services are provided through subregion distinguishing, auxiliary point distinguishing and other positioning calculation mechanisms.

The invention provides a microfluidic unicellular active oxygen automatic analyzer. The microfluidic unicellular active oxygen automatic analyzer consists of a system control module, a cell fluorescence mark module, a cell / fluid electric control module, a cell / fluid hydraulic control module, a microfluidic chip, a chip operation platform, a unicellular capture 'identifying and triggering' module,a fluorescence detection module, a signal processing and data acquiring module and program software. The microfluidic unicellular active oxygen automatic analyzer integrates a unicellular component analyzing method, cell fluorescence marking, cell / fluid control, fluorescence detection and a microelectronic control technique, provides a unicellular capture 'identifying and triggering' concept, identifies unicellular capture according to resistance change when a single cell reaches the inlet of a separation channel, and triggers automatic switching and data acquisition of 'unicellular capture and film dissolution' operation at the same time. The microfluidic unicellular active oxygen automatic analyzer can realize operation of cell fluorescence marking, cell sampling, unicellular capture, film dissolution, electrophoretic separation, unicellular active oxygen detection and the like on the microfluidic chip.

The invention discloses a continuous phase plate machining error identification method, and belongs to the field of phase plate machining error identification. The continuous phase plate machining error identification method adopts two times of matching, the first time of matching is carried out on a measured surface shape and a reference surface shape, roughly positioned translation position coordinates are obtained, then the second time of matching is carried out on the measured surface shape and the reference surface shape in a neighborhood range set according to the translation position coordinates, the error range is decreased, accurately positioned position parameters are obtained, and a machining error indicator is obtained according to an accurately positioned position function. The continuous phase plate machining error identification method overcomes the defect that error identification can not be carried out on a CPP requiring for high accuracy through one time of matching and improves the accuracy of error identification of the CPP through the two-time matching method with the progressively improved accuracy, the RMS value of error identification through the method can be below 30 nm, and the PV value can be below 1 wavelength.

The invention discloses an upstream and downstream intersection traffic flow based heuristic lost road traffic flow estimation method. According to the invention, a connection between an intersectionand roads is established, the flow is marked and roads with unknown flow are determined; an initial flow difference index is calculated; the traffic flow of the roads with the unknown traffic flow iscalculated according to the traffic flow condition of an upstream intersection and a downstream intersection of each road with the unknown traffic flow; flow value update of each road with unknown flow is adopted as a scheme and the flow different index of the scheme is calculated, a scheme having the smallest flow difference is selected for each iteration process until the iteration frequency orthe flow difference index cannot decrease any more, and a mapping set including all road IDs and traffic flow data on a road network is output. According to the invention, the update scheme of each process is calculated according to relation of the inlet traffic flow and outlet traffic flow of the upstream and downstream intersections and heuristic search is performed by adopting the flow different minimization as the target and the iteration frequency as a constraint condition, so that an improved traffic flow distribution condition can be given in a controllable period and a problem of traffic flow data insufficiency is relieved.

The invention belongs to the technical field of air cooling system controlling, and particularly relates to an air cooling island array control method based on a temperature field and a velocity field. The air cooling island array control method comprises the steps that environment temperature, face velocity, feed water flow, main steam quantity and condensated water outlet temperature of an air cooling unit are monitored in real time, steam quantity and heat quantity of each element of an air-cooling condenser are calculated, steam inlet temperature of a heat dissipating device of each cooling element of the air-cooling condenser is calculated, heat quantity generated by phase transition and condensation of water steam is calculated, then heat quantity generated by continuous cooling of condensated water is calculated, and according to heat dissipating capacity quantity, condensated water quantity is calculated; power dissipation and blast capacity of each air cooling element are measured and calculated; the heat transferring work efficiency of the air cooling elements is calculated, the rotating speed of high-efficiency draught fans can be heightened in an arrayed mode, the rotating speed of low-efficiency draught fans is lowered, the reasonable contribution of each draught fan is adjusted, therefore the optimum control of an air cooling island is achieved, the power consumption of the air cooling island is effectively reduced, and an air cooling island array control system can be operated stably, reliably and optimally.

The invention relates to an output power prediction method for photovoltaic generating devices; the method comprises: predicting by using a physical model prediction, and a neural network prediction of environmental factors and a rolling a neural network prediction; setting the physical model prediction as P0, the neural network prediction of the environmental factors as P1, the rolling a neural network prediction as P2, and final power prediction output value as p; if P1 is more than P0 and P2 is more than P0, P is equal to P0; if the P1 is more than P0 that is more than P2, P is equal to P2; if the P2 is more than P0 that is more than P1, P is equal to P1; if P1 is less than P0 and P2 is less than P0, P is equal to (P1+P2) / 2. According to the output power prediction method for photovoltaic generating devices provided by the invention, relatively complex mathematic relation is changed to be simple and reasonable mathematic relation, thus being beneficial to applying to actual engineering, improving predicting speed, reducing predicting difficulty, and being capable of significantly improving accuracy of prediction value of photovoltaic module output power, controlling error range and eliminating outlier.

A method for positioning a portable communication device comprises the following steps: firstly, detecting the field strength values of a plurality of base stations close to the portable communication device so as to calculate the positioning coordinate of the portable communication device; then, retrieving the environmental characteristic values between each base station and the portable communication device from a geographic information system according to the base station coordinate and the positioning coordinate of each base station so as to substitute the environmental characteristic values into the path loss model to correct the field strength values of each base station; and recalculating the positioning coordinate, at which the portable communication device is positioned, based on the corrected field strength values, thereby improving the positioning accuracy.

The invention relates to a coke production method. The coke production method comprises the following steps: step S1, performing the coke preparation experiment by using coking coal, establishing a coke experiment database, wherein the coke experiment database comprises coking coal gene data information, coking process data information and coke performance data information; step S2, establishing acorrelation model among the coking coal gene data information, the coking process data information and the coke performance data information according to the coke preparation experiment; and step S3,determining predicted performance data of the to-be-produced coke, and selecting the coking coal gene data and coking process data matched with the predicted performance data from the coke experimentdatabase according to the correlation model, and instructing the coke production according to the matched coking coal gene data and coking process data. According to the coke production method provided by the invention, the production is instructed by virtue of data, so that the coke production process is optimized.

The invention relates to a method of correcting GPS positioning signal offset on GPS terminal equipment, comprising the steps of: receiving corresponding GPS positioning data, making 3D calculation to obtain the current position's positioning data information, combining with the front two effective positioning data to make validity judgment on the current positioning data, according to the results, discarding it or using it as effective data to determine whether there is error, according to the judgment results, outputting directly or after correction, and displaying on the GPS terminal equipment. Thus, it improves GPS positioning accuracy; besides, improves the whole performance and reduces the error range from above 10m to less than 3m, expands application range of the GPS positioning system, and brings very great convenience to the people's production and life.

A method and apparatus for a sensor network having a plurality of reference nodes and a sensor node that enables the sensor node to compute a relative position through transmission range control and position mapping. In transmission range control, each reference node sends location information signals to the sensor node while varying transmission power. In position mapping, the sensor node forms a grid of vertical and horizontal lines corresponding to a square area defined by the neighboring reference nodes, extracts coordinates of intersections in the grid belonging to a shared region between areas covered by location information signals of various transmit power levels from the neighboring reference nodes, and sets the position of the sensor node to the middle points of the extracted coordinates. Each reference node sends a location information signal when a random backoff time expires after reception of a location information request signal.

The invention discloses a carrying clamp manipulator which comprises a rack, a servo motor, a reducer, a left-right-spinning screw rod, a clamping fixing plate mechanism and a clamping plate, whereinan adjusting screw rod seat is arranged on the rack; the left-right-spinning screw rod is mounted on the adjusting screw rod seat; the servo motor is connected with the reducer and drives the reducerto work; the reducer is connected with the left-right-spinning screw rod and drives the left-right-spinning screw rod to rotate; the clamping plate is connected with the right-spinning thread sectionof the left-right-spinning screw rod; the clamping fixing plate mechanism comprises a connecting seat, a clamping fixing plate, a sliding block and a clamping air cylinder; the connecting seat is connected with the left-spinning thread section of the left-right-spinning screw rod; a sliding rail parallel to the left-right-spinning screw rod is arranged on the connecting seat; the sliding block isembedded on the sliding rail in a nested manner; the clamping fixing plate is fixed on the sliding block; the clamping air cylinder is fixed on the connecting seat; and the output end of the clampingair cylinder is connected with the clamping fixing plate. The carrying clamp manipulator can adjust the width of the clamping plate accordingly for paper cartons with different specifications to improve the carrying capacity, lower the equipment cost and improve the production efficiency.

The invention provides an LED (light-emitting diode) display screen box body which is surrounded by six metal panels formed by stamping. The LED display screen box body is integrally of a rectangular shape. The peripheries of the adjacent metal panels are occluded through concave and convex structures which are matched mutually. Connecting pieces are arranged at four corner positions of at least two opposite metal panels for riveting and fixing. Due to the adoption of the assembled box body with the occluded structure, the processing error of a box body with the bent structure can be avoided and the error range can be furthest reduced, so that the precision of the size of the box body is ensured and the size error can be ensured in the horizontal, vertical and diagonal directions. Moreover, in the machining and producing process, only a numerical control punching machine is required, so that compared with the conventional box body, the LED display screen box body has the advantage of saving great resource cost and labor cost.

The invention provides a method for dragging a camera to make displacement in a scene based on unity3D. The method comprises the steps of judging whether the camera is an orthogonal camera; if so, calculating horizontal displacement X and vertical displacement Y according to a size of the camera, wherein X is equal to 2*size*(width-to-height ratio of frame); Y is equal to 2*size; the width-to-height ratio of the frame is a width-to-height ratio of a built-in screen of a unity3D engine; and the size of the camera is one half of visual field width of the orthogonal camera; if not, acquiring a straight line distance d from the camera to a center point of a visual field and an FOV (field of view) of the camera and calculating the horizontal displacement X and the vertical displacement Y, wherein X is equal to d*2*tan(FOV / 2) and Y is equal to X / (width-to-height ratio of frame); and finally correcting X and Y according to a rotation angle alpha of the camera to obtain corrected horizontal displacement X1 and corrected vertical displacement Y1 as target values, and making the displacement by following the target values at a certain rate in an interpolation manner to achieve a smooth movement effect. According to the method, an actual displacement effect is precisely calculated; an interpolation rate is flexible; the dragging displacement smoothness is improved; and an application scope is wide.

A method and apparatus for a sensor network having a plurality of reference nodes and a sensor node that enables the sensor node to compute a relative position through transmission range control and position mapping. In transmission range control, each reference node sends location information signals to the sensor node while varying transmission power. In position mapping, the sensor node forms a grid of vertical and horizontal lines corresponding to a square area defined by the neighboring reference nodes, extracts coordinates of intersections in the grid belonging to a shared region between areas covered by location information signals of various transmit power levels from the neighboring reference nodes, and sets the position of the sensor node to the middle points of the extracted coordinates. Each reference node sends a location information signal when a random backoff time expires after reception of a location information request signal.

The invention relates to a hard disk preheating method of a computer device. Preset positions outside the computer device are provided with a temperature sensing element and a heating device. The temperature sensing element is utilized to sense an external temperature value of a hard disk, and the external temperature value of the hard disk is compared with a start threshold temperature value in adata memory unit of the computer device, and the start threshold temperature value is corrected by a preset compensation value stored in the data memory unit. When a result obtained by subtracting the preset compensation value from the external temperature value of the hard disk is smaller than the start threshold temperature value, the hard disk is prohibited to start, and after the hard disk isheated by the heating device to reach the start threshold temperature value of the hard disk, the hard disk is started so as to avoid the damage of the hard disk because of too low temperature in thehard disk when the hard disk is started.

The invention provides a device for testing the air permeability of a graphite material. The device comprises an air storage tank, a pressure stabilizing tank, a pressure reducing filter, a flow meter, a testing tank, a tee joint, an exhaust pipe and a differential pressure gauge, the testing tank comprises a lower pipe, an upper pipe, a lower annular rubber pad, a radial sealing ring, an upper annular rubber pad, a graphite material sample and a sealing ring; the pressure difference exists between the two sides of the sample in the thickness direction; gas passing through a sample, the differential pressure of the two sides of the sample in the thickness direction is displayed by the differential pressure gauge, the pressure and the flow of gas flowing through the sample are displayed bythe flow meter, and then the air permeability of the graphite material is calculated according to a differential pressure method, so that the air permeability of the graphite material with high density and very small air permeability is detected, and the precision and the accuracy are relatively high.