496results about How to "Accuracy impact" patented technology

The invention discloses an interior noise analysis and prediction method of a high speed train. The method comprises the following steps: establishing a train reconditioning train body model, a statistical energy analysis model of a body in white structure and an interior and exterior vocal cavity statistical energy analysis model, and carrying out simplification and subsystem division; obtaining the statistical energy analysis parameters of the train body structure and an interior vocal cavity model, and loading the statistical energy analysis parameters onto a train body structure model plate subsystem and a vocal cavity model subsystem; and obtaining exterior vocal excitation source energy borne on the train body, applying the exterior vocal excitation source energy onto the exterior vocal cavity statistical energy analysis model, causing the exterior vocal excitation source energy to reach an interior vocal cavity after the exterior vocal excitation source energy is attenuated by the sound insulation property of a structural plate in a body in white structure model so as to obtain structural noise energy radiated into the train by the reconditioning train body under the function of the two-line suspension force of a compartment, and then, carrying out interior noise analysis and prediction. The problem that the interior noise of the train is difficult in prediction and the problems of the upper limit boundedness of a frequency domain, complex calculation flow, incomplete motivation consideration in the traditional method are overcome, calculation efficiency and prediction accuracy are improved, and development and test cost is lowered.

The invention discloses a federated modeling method, device and equipment based on a block chain, and a storage medium. The method comprises the following steps: a training initiator issues configuration information to all training clients based on client information corresponding to the training clients when the number of the training clients is monitored to reach a preset number; the training initiator uploads a to-be-trained model to a main chain; and the training initiator determines a target model based on aggregation gradient and the to-be-trained model. Modeling of federated learning isrealized through the block chain; on the premise of protecting the privacy of federated learning data, the accuracy of federated learning is not affected, the training effect and model precision of federated learning are improved, model parameters such as gradients in transmission do not need to be modified, and the balance between privacy protection of the model parameters such as gradients andmodel convergence or model precision is achieved; and information leakage can be completely prevented, so the safety of data samples in federated learning is improved.

The invention discloses a display device. A filtering structure arranged between a protective cover plate and photosensitive devices is changed into filtering layers which are arranged in a laminated way, each filtering layer includes a light transmission area and a shielding area beyond the light transmission area, central positions of the light transmission areas of the different filtering layers are dislocated partially at least, orthographic projections of the light transmission areas of the different filtering layers in a display panel include an overlapped area, and the area of the overlapped area is the light transmission area of the filtering structure. The dislocation sizes of the central positions of the light transmission areas of the different filtering layers are adjusted to reduce the light transmission area of the filtering structure according to requirements, and thus, the filtering structure is not influenced by precision of manufacturing equipment, and the precision of optical fingerprint identification is improved. After that the light transmission area of the filtering structure is reduced according to requirements, a collimation effect can be ensured, and the filtering structure is prevented from being too thick and further influencing the thickness of the display device.

The invention relates to a navigation method realized by means of loose combination of visual navigation / inertial navigation. The main research content is to periodically correct inertial navigation parameters by using the position of the visual navigation and velocity information. The navigation method solves the problem that inertial navigation error accumulates over time. According to the navigation method, an error equation of an inertial navigation system is used as a state equation of a filter, the difference between the position calculated by means of the visual navigation and the position solved by using the inertial navigation system is used as measurement of Kalman filtering, and the parameters of the inertial navigation system and the error of a sensor are estimated, so that the inertial navigation parameters are corrected. Compared with the prior art, by adopting the scheme, the navigation method can enable the inertial navigation system to be maintained to have high accuracy for a long time, and the accuracy of the inertial navigation system is not affected due to failure of visual navigation calculation.

The invention discloses an automatic sorting machine for semiconductor chips, comprising a bottom plate. The bottom plate is provided with a chip feeding table, a chip test table, a chip BIN sorting table and a material taking unit. The transfer of a chip is carried out between the chip feeding table and the chip test table as well as between the chip test table and the chip BIN sorting table through the material taking unit. The design of integrating examining, test and sorting greatly improves the accuracy and the reliability of examining and sorting of the semiconductor chips, and avoids the condition that concentrated examining is firstly carried out and then BIN is singly sorted to be easy to cause errors so as to influence the accuracy of the sorting.

The invention provides an over-erasing processing method for a nonvolatile memory. The method comprises the following steps: checkout: selecting a memory cell, and checking whether the threshold value voltage of the selected storage unit is less than 0V or not; if yes, performing the following steps, and if not, selecting another memory cell to check; voltage application: applying positive voltage to the word line of the selected memory cell, applying programming drain electrode voltage to a drain electrode, applying voltage less than the threshold value voltage of the non-selected memory cell to the word line of the non-selected memory cell; secondary checkout: checking whether the threshold value voltage of the memory cell processed in the voltage application step is less than 0V or not; if yes, returning back to the voltage application step; and if no, finishing the processing. The over-erasing processing method for a nonvolatile memory is characterized in that the memory cell of which the threshold value voltage is less than 0V is subjected to secondary over-erasing processing to guarantee the accuracy of the over-erasing processing. The invention also provides an over-erasing processing system for the nonvolatile memory.

The invention provides an automation straightener for a drilling tool, which comprises a base, a pressure machine, a roller, a lifting device, a movable cushion block, a detecting trolley, and a control module, wherein the base is used for supporting; the pressure machine is used for pressing against the straightening drilling tool and is movably arranged on the upper part of the base; the roller is used for rotating the drilling tool, and one end of the roller is arranged on the base in a stretchable connection way; the lifting device is used for jacking the drilling tool, and one end of the lifting device is fixedly arranged on the base and positioned at the outer side of the roller; the movable cushion block is used for supporting the drilling tool, and one end of the movable cushion block is movably arranged on the base; the detecting trolley is used for detecting shape and position data of the drilling tool and is movably arranged on the base, and transmits the data to the control module; and the control module receives the data transmitted by the detecting trolley, and controls the actions of the pressure machine, the roller, the lifting device, the movable cushion block and the detecting trolley according to the data and a preset program. The automation straightener for the drilling tool realizes automatic detection and automatic control when the drilling tool is repaired by using the detecting trolley and the control module, thereby largely reducing human intervention, realizing the automation for drilling tool repair and achieving high accuracy of drilling tool repair, rapid speed, and high stability.

A pulse light beam quality test Hartmann wavefront sensor includes a data collection device capable of receiving and sending synchronous pulse signals, a micro-prism array, a Fourier lens and a photoelectric detector, characterizing that said sensor is composed of a micro-prism array in a variable period two-dimension saw-tooth phase grating structure, a Fourier lens close to it and the photoelectric detector, among which, the micro-prism array has a ring layout structure with a symmetrical single etching center and a double sided grating structure with double-sided etching which can either apply the micro-optical technology or binary optical technology.

The invention relates to a Rogowski coil-based integrator circuit for an electronic current transformer. The integrator circuit consists of a Rogowski coil, a low-frequency gain planarization analog integrator and a signal processing circuit, wherein the Rogowski coil is used for outputting a transient signal to the low-frequency gain planarization analog integrator and outputting a steady-state signal to the signal processing circuit; the low-frequency gain planarization analog integrator is used for processing the transient signal output by the Rogowski coil and is connected with the Rogowski coil and the signal processing circuit; and the signal processing circuit is used for processing an output signal of the low-frequency gain planarization analog integrator and performing digital integration on the steady-state signal output by the Rogowski coil, and then the processed signal is transmitted to a protecting channel and a metering channel through an output interface circuit. The integrator circuit has the advantages of measuring the steady-state signal with high precision, quickly responding to the transient signal, and providing measurement data of the protecting channel and the metering channel at the same time through one Rogowski coil, along with high temperature stability and vibration resistance.

The invention discloses an indoor pedestrian UWB / INS tightly combined navigation system and method adopting pseudo range and position information. The system comprises an inertial navigation device (INS), a UWB positioning label, a UWB reference node, and a data processing system. The inertial navigation device (INS) and UWB positioning label are arranged on the shoe and body of a pedestrian respectively. The UWB reference node can be arranged on any position. The inertial navigation device (INS) and UWB positioning label are connected to the data processing system. The device and method have the advantages that the position information of reference node is introduced into state variable, and at the same time, the position information of the reference node is estimated by a filter so as to overcome the shortages that a combined navigation system should obtain the position information of a reference node in advance and the positioning precision of the combined navigation system is depended on the precision of obtained position information of the reference node.

The invention discloses an aerial video highway lane line detection method based on line spacing characteristic point clustering, which comprises the following steps: reading video frame; Image segmentation; equilibrium from a large number of data points, fully extract the characteristic points of each lane line; the similarity matrix is constructed based on the similarity measure method of line spacing, and the characteristic points of different lane lines are clustered. The cubic B-spline model of lane is established and the parameters of the model are estimated by the improved RANSAC algorithm; correction and prediction of lane parameters. The invention detects and pretreats the edge of the expressway in the video of the aerial shooting of the expressway, Reducing the processing time ofthe next frame, effectively removing the interference pixels outside the freeway, has a better clustering effect on lane feature points, can get more accurate and more stable lane fitting effect, andcan achieve real-time processing effect.

The invention provides a drive control device used for a proportional valve, comprising a drive unit, a drive feedback unit, a logic processing unit and a power supply and protective unit, wherein, the drive unit is used for receiving the input of control signals, converting the control signals into drive signals, and controlling the opening of the proportional valve according to the drive signal; the drive feedback unit is connected with the drive unit, and is used for monitoring the drive signals of the drive unit, and providing a monitoring signal; the logic processing unit is connected with the drive feedback unit, is used for processing the monitoring signal output by the drive feedback unit, and providing a protective signal; and the power supply and protective unit is connected between the logic processing unit and the proportional valve, and is used for executing the protective operation of the proportional valve according to the protective signal output by a logic processing component. The drive control device can enable the proportional valve to have high accuracy and safety.

An adaptive optical system based on X-H wave front transducer of micro prism comprises X - H wave front transducer of micro prism, wave front processor and wave front calibrator. It is featured as forming said transducer by micro prism array in two - dimensional saw tooth phase grating structure and Fourier lens as well as photoelectric detector, using two structures of ring structure with single surface photo etching center symmetry or double surface grating structure with double surface photo etching as said micro prism array structure, applying micro optical technique or two - element optical technique to prepare two said structure.

The invention discloses a device and method for testing a road surface peak attachment coefficient and belongs to the technical field of vehicle control. The method comprises the steps that 1, the car mass center accelerated speed ax, car speed v, wheel rotating speed wi, wheel cylinder pressure pi and driving torque Ti obtained by wheels are collected; 2, according to the accelerated speed ax, the state of a car is judged, the longitudinal force of the wheels is obtained, and the driving force or braking force of the wheels is calculated; 3, the slip rate of the wheels of the car is calculated according to car speed v and wheel rotating speed wi information; 4, the normal load of the wheels is calculated according to the accelerated speed ax; 5, the attachment coefficient (please see the formula in the description) is calculated according to the longitudinal force and normal load of the wheels; 6, according to the slip rate and attachment coefficient of the wheels, two approximate road surfaces R1 and R2 are selected from prestored calibration curves, and wheel attachment coefficients (please see the formula in the description) corresponding to the two approximate road surfaces and road surface peak coefficients mu1 and mu2 are obtained; 7, the approximation degree lambda of the approximate road surfaces is calculated; 8, the peak attachment coefficient mu max of the current road surface is calculated. The device and method are simple and effective, wide in application range and high in efficiency, and vehicles can be controlled well.

The invention discloses a mode density function simulation algorithm for three-dimensional reconstruction of a porous media. A three-dimensional structure of the porous media can be reconstructed with a computer technology and a mathematic modeling method by utilizing a two-dimensional image. The invention aims to achieve three goals of accurate three-dimensional porous media reconstruction. Firstly, a three-dimensional reconstruction result is consistent with a low-order statistic property of a training image; secondly, the three-dimensional reconstruction result (three orthogonal tangent planes) is similar to a morphological characteristic of the training image; and thirdly, the algorithm has stability. The invention has main innovations that a mode density function concept and an iterative algorithm, namely, the mode density function simulation algorithm taking the mode density function as a target function and fusing multiple stages of grids are provided; a neighborhood statistic method and an adjacent grid inverse point selection method are provided for speed problems of key points in the reconstruction algorithm, and a temperature control mechanism is simplified; and that the three-dimensional structure of the porous media can be accurately reconstructed by utilizing the two-dimensional training image is verified by utilizing a testing experiment of a rock core sample.

The invention discloses a testing device and method for measuring the sandy soil moving states under different liquefaction degrees. The device comprises a model box, a working bench, a support, a speed regulating electromotor and a PIV (peak inverse voltage) platform, wherein the model box is internally provided with pulley blocks and steel wire ropes; the PIV platform is installed on one side out of a panel pasted with a transparent scale grid paper, and consists of two parts including a CCD (charged coupled device) digital camera and a camera support. A using method of the device comprises the following steps of: simulating liquefied sandy soil with different liquefaction degrees by adopting plastic sands with different gradations and a sodium chloride solution with specific density; dragging a carbon wire by the speed regulating electromotor; driving semi-spherical-body slide blocks to move horizontally by the pulley blocks; installing a pull force sensor at the vertical moving section; and measuring the moving state of plastic sand particles around during the moving process of the semi-spherical-body slide blocks by utilizing the PIV platform and the pull force sensor. The testing device and method for measuring the sandy soil moving states under different liquefaction degrees have the advantages that the liquefied sandy soil can be simulated under different pore pressure ratios according to actual requirements; the measurement accuracy is high; the operation is simple and feasible and the like.

The invention discloses improved skip weight-fixed loading equipment, which belongs to the technical field of weighing. A sector gate is mounted at an discharge port of a weight-fixing hopper; a weighing sensor is mounted at the bottom of the weight-fixing hopper; an sector gate oil cylinder is welded on the side wall of the weight-fixing hopper; the sector gate is connected with the sector gate oil cylinder; a coal level meter is mounted in a surge bunker; the discharge port of the surge bunker is positioned at the bottom of the bunker; a flat gate is mounted at the discharge port and is connected with a flat gate oil cylinder; the surge bunker is positioned right above the weight-fixing hopper; counterweight lifting oil cylinders are mounted below the two side walls of the weight-fixing hopper respectively; the oil paths of the flat gate oil cylinder, the counterweight lifting oil cylinders and the sector gate oil cylinder are connected with a hydraulic pump station; the coal lever meter, the weighing sensor, a belt conveyor and the hydraulic pump station are electrically connected with a controller in a lifting control chamber. The improved skip weight-fixed loading equipment has the advantages of high coal loading precision, strong reliability, avoidance of frequent exchange of the weighing sensor and reduction in maintenance cost.

The invention discloses a direct current power supply insulation detection device and detection method. The detection device includes a voltage detection module, a pair of balance bridge resistors, and a pair of detection bridge resistors, and also includes a current detection module used for detecting the sum of currents of the pair of balance bridge resistors during single-pole grounding insulation resistance value detection and detecting the sum of the currents of the pair of detection bridge resistors and current of each of the pair of detection bridge resistors during dual-pole grounding insulation resistance value detection; and a calculation module used for acquiring leakage current and calculating the single-pole grounding insulation resistance value according to grounding voltages of direct-current positive and negative buses and the acquired leakage current during single-pole grounding insulation resistance value detection, and acquiring leakage current and calculating the dual-pole grounding insulation resistance value according to the grounding voltages of the direct-current positive and negative buses and the acquired leakage current during dual-pole grounding insulation resistance value detection. By implementation of the technical scheme of the direct current power supply insulation detection device, the cost is low and the precision is high.

The present invention is method of online eliminating real-time constant drift of gyroscope in strapdown inertial navigation system (SINS), which includes four single shaft gyroscope, one monitoring one and three navigation ones. During SINS operation, the monitoring gyroscope can online measure the constant drifts of the three navigation gyroscopes after each starting and their slow changes autonomously and complete real-time comprehensive compensation without depending on outer information. The said measurement and compensation is performed throughout the SINS operation to overcome the influence of change in gyroscope performance on the precision of SINS. The present invention has the features of autonomy, flexibility and high precision, and may be used in raising the precision of different strapdown inertial navigation systems.

The invention relates to a crystal-free USB device clock calibration method and a calibration circuit, used for implementing the following steps: identifying and sampling an SOF packet on a USB bus, verifying the sampled SOF packet data, and outputting verification signals; counting the verification signals, comparing with a preset count value according to the counting result, and configuring a PLL parameter according to the comparison result; and clock-calibrating the RC oscillator of the USB internal clock and the PLL phase locked loop according to the PLL parameter. The invention has the beneficial effects that the information of the remainder part is retained, and the multi-phase sampling of the USB serial differential signal is carried out by using the fractional frequency dividing idea, so that the level characteristic of the USB serial differential signal can be accurately determined; all the information of the SOF packet is verified to ensure the reliability of SOF detection; the detection result will be more accurate; and in particular, the accuracy of the SOF packet detection of the invention is not affected by the internal clock bias to be calibrated.

The invention discloses an intelligent monitoring system for a power cable production process. The system comprises an image acquisition assembly, a sensor assembly, a wireless transmission module, anintelligent monitoring center and a danger alarm module. The sensor assembly is used for collecting environmental data and temperature data of the surface of power cable production equipment And transmitting the acquired data to the intelligent monitoring center; the intelligent monitoring center processes the received data and compares the processed data with a preset safety threshold value; andwhen the data is higher than a preset safety threshold value, the danger alarm module gives an alarm, image acquisition is carried out on the position where the sensor node for acquiring the data islocated through the image acquisition assembly, and the acquired image is displayed after being processed. The beneficial effects of the invention are that the system achieves the effective monitoringof the environment of a power cable production workshop and the operation state of power cable production equipment, and improves the monitoring intelligence of a power cable production process.

The invention discloses a data classification method based on improved local abnormal factor detection. The method comprises the steps of outlier factor detection; similarity measurement; selection ofan initial clustering center point, and screening of data with relatively small outlier factors as a candidate set of the initial clustering center through a local outlier factor detection LOF algorithm for adaptively adjusting k distance parameters; and iterative optimization on the clustering center. In the iteration stage of the optimized clustering center, the outlier factor between the datais standardized by using the outlier standardization, so that the value range of the new outlier factor new _ ri is greater than or equal to 1. According to the invention, the accuracy of cluster center positioning and cluster division is improved.

The invention provides a roadway surrounding rock separation layer displacement monitor, which comprises a shell, a preventer plate, two sets of separation layer displacement transmission mechanisms, a separation layer displacement sensing unit and an information acquisition processing unit, wherein the separation layer displacement transmission mechanism comprises a displacement bracing wire, a transmission shaft, a driving wheel, a driving band, a take-up reel, a roll-up spring and a lock device; the separation layer displacement sensing unit comprises a support circuit board, a T platform, a grating and a photoelectric coupler; the preventer plate is provided with a leakage hole; and one end of the displacement bracing wire is fixed in the stratum and the other end thereof is clamped inside a T slot of the take-up reel. The monitor of the invention has the beneficial effects of having simple manufacturing technology and structure, convenient operation, improving displacement inspection accuracy, being applied to construction processes of mine exploitation, building, water conservancy, roads and the like, effectively and automatically monitoring surrounding rock mass, roadway roof and floor, dam bodies, side slopes and the like in real time, and timely eliminating potential safety hazard of production; and the monitor of the invention can provide basis for the roadway and the support rock mass design.

The invention relates to a manufacturing method for a satellite borne antenna reflecting surface, particularly relates to a manufacturing method for a high-precision satellite borne antenna reflecting surface adopting a carbon fiber composite panel aluminium honeycomb sandwich structure, and belongs to the technical field of satellite communication and deep space detection. The reflecting surface is shaped like a 'cap with a brim', the periphery of a panel adopts a symmetrical laying layer, and is enabled to form a local thickened symmetrical laying layer, the maintenance of the shape surface precision during the panel forming process and the follow-up operation is facilitated, and the condition that the inboard shrinkage produced due to the differential pressure change during the honeycomb sandwich structure forming process influences the precision of the center reflecting area is prevented.

The invention provides an improved strong tracking square-root cubature Kalman filtering method. A mechanism for increasing the robustness of a strong tracking algorithm through an attenuation factor and an SCKF algorithm flow are analyzed; therefore, ISTCKF reselects the introduction position of the attenuation factor; and thus, the extra calculation amount due to introduction of the attenuation factor is reduced.

The invention discloses a method and apparatus to recognize the position of a detector crystal unit. The method includes the steps of: gaining a generated location scatter diagram based on a radiation source detector; calculating a peak point in the location scatter diagram and identifying an initial valley point based on two adjacent peak points; conducting a first segmentation to the location scatter diagram based on the peak point and the initial valley point to identify an initial boundary of the crystal unit; respectively conducting a gray level projection to the image region of the initial boundary inner of each row and each column crystal unit to obtain a grey level projection curve of each row and each column crystal unit; identifying a target valley point based on the minimum point in the grey level projection curve of each row and each column crystal unit; conducting a second segmentation to the location scatter diagram based on the peak point and the valley point, so as to identify a target boundary of each crystal unit. The method and apparatus to recognize the position of the detector crystal unit are possible to avoid the inaccuracy of the valley point caused by the inconformity of physical characteristics of each crystal unit, thereby accurately recognize the location of each crystal unit.

The invention relates to the technical field of living prawn measurement, and particularly discloses living prawn growth phenotype detection equipment and method. The equipment comprises a dark box, atransparent pipeline, industrial cameras, a computer, a light source and an industrial personal computer, wherein the dark box is provided with a waterproof function and a light shielding function; the transparent pipeline is used for placing to-be-detected prawns into water, the transparent pipeline penetrates through the dark box, and the two ends of the transparent pipeline penetrate out of the dark box and communicate with the outside; at least four industrial cameras are uniformly distributed on the periphery of the transparent pipeline and can be used for collecting prawn images in thetransparent pipeline, and the industrial cameras are connected to the dark box; the computer is connected to the industrial cameras, and the computer comprises an image recognition module and a data storage module which are connected to the industrial cameras; the light source is arranged in the dark box and is close to the transparent pipeline; and the industrial personal computer is connected tothe light source and the industrial cameras. According to the equipment and the method, the measurement accuracy can be improved, and the contact with the prawns can be reduced, so that the damage tothe prawns is reduced; and furthermore, the measuring speed is fast, and the efficiency is high.

The invention provides a method and a device for determining position regions of users. The adjacent position regions do not coincide with one another and are provided with boundaries. The method includes determining whether each data point in data sets is a boundary data point or a non-boundary data point; removing at least one part of non-boundary data points from each data set to form a new data set; locating the position regions of the users on the basis of the new data sets. The device comprises a data point judging module, a data set simplifying module and a locating module. The method and the device for determining the position regions of the users have the advantages that the position regions of the users can be quickly and accurately located on the basis of geographic position information reported by mobile terminals, accordingly, most position region locating requirements of application of the mobile terminals can be met, the position region locating time cost and economic cost can be saved, and the user experience can be improved.