218results about How to "Avoid Accuracy Impact" patented technology

The invention discloses a method for remote sensing monitoring and early warning fire in sylvosteppe, belonging to the field of remote sensing technology application. The invention makes full use of the information expressive force of satellite remote sensing data on a large-scale space, comprises fire risk evaluation on the sylvosteppe ecological system in a large-scale range and detection of abnormal high-temperature points in the sylvosteppe on the basis of the remote sensing data, and generates the fire remote sensing monitoring and early warning information for the sylvosteppe in a point-sphere integrated manner by assimilating and processing the detection data (point) on the abnormal high-temperature points and data of fire risk evaluation (sphere), thus providing decisive instruction information for fire protection and fire emergencies of the sylvosteppe. The invention is characterized by comprising four parts of a data pre-treatment unit, an abnormal high-temperature point detection unit, a fire risk evaluation unit and an early warning information processing unit.

The invention discloses a time domain bidirectional iteration-based turbine vane flutter stress forecasting method. The method is characterized in that: a set of bidirectional iteration method for a time domain is designed by taking a vane and a surrounding flow field thereof as a three-dimensional fluid solid coupling system, and the flutter stress of the vane is obtained by alternately solving vane deformation and unsteady flow field. The method comprises the following steps of: setting a structural calculation module, a fluid calculation module, a data conversion module, a flutter stress output module, an initial value calculation module and a bidirectional iteration module in a computer; acquiring static vane deformation and steady flow field serving as an initial value by nonlinear iteration; alternately calling the structural calculation module and the fluid calculation module to propel the whole system on time; transmitting fluid solid boundary information through the data conversion module; and outputting the flutter stress on time history. The method realizes integrated calculation of the vane and the flow field, takes the nonlinearity of the coupling system into consideration, and can allow the observation of the whole flutter development process and forecast the flutter stress of the vane.

The invention relates to a sensorless brushless DC motor commutation deviation fast correction control system and a method. An analytical equation between the bus current difference before and after commutation and commutation deviation is derived according to the bus current fluctuation value before and after commutation. In view of the influence of commutation ripple and motor three-phase winding asymmetry on the accuracy of sampled current during actual bus current sampling, a method for current offset sampling in the same conduction zone is designed. The bus current difference is obtained according to the designed current sampling method, the commutation deviation is calculated based on the analytical equation, and the commutation signal is compensated and corrected in real time. By designing the sensorless motor commutation deviation fast correction control system, the commutation deviation convergence time is reduced greatly, and the commutation precision is improved.

Disclosed is a method for acquiring nuclear fuel assembly resonance parameters. The method includes the following steps: building a commonly-used nuclide multi-group database and a changing curve of resonance peaks along with energy; distinguishing isolated peaks and dense peaks, wherein the interval where the isolated peaks are located is a resonance energy region low energy section with obvious resonance interference, and the interval where the dense peaks are located is a resonance energy region high energy section without obvious resonance interference; solving a subgroup total cross section, a subgroup partial cross section, subgroup probability and corresponding multi-group data coupling in the resonance energy region high energy section by using a subgroup method; coupling calculation of the resonance energy region high energy section and calculation of the resonance energy region low energy section through inter-group scattering from the high energy section to the low energy section, acquiring the resonance parameters of the high energy section, and then calculating a scattering source and a fission source from the high energy section to the low energy section; acquiring a multi-group neutron energy spectrum in a low energy region by using a wavelet expansion method; and merging and continuing the total cross section and the partial cross section by using the multi-group neutron energy spectrum of the resonance region low energy section to acquire the nuclear fuel resonance parameters of the low energy section. By means of the method, resonance parameters of nuclear fuel assemblies with any resonance material composition, any geometry and any quantity of resonance regions can be effectively acquired.

The invention discloses a high-precision drilling platform for bridge construction, which includes a base, a drill bit, and a motor. One end of the drill bit is fixed to a second screw, and the second screw drives the drill bit through the base to reciprocate up and down; the upper part of the second screw rotates A second baffle is connected, and the second lead screw passes through the second baffle to connect with the motor; the outer side of the second lead screw is meshed with a stabilizing device, and the stabilizing device fixes the second lead screw, and the second lead screw passes through the stabilizing device Up and down reciprocating motion. The high-precision drilling platform for bridge construction solves the problem that the existing bridge construction drilling device cannot accurately control the downward drilling depth of the drill bit, so that the drilled holes cannot reach the expected depth.

The invention discloses a ridge prism cemented component production technology and a fixture thereof and belongs to the technical field of optical component production. The ridge prism cemented component production technology comprises the steps of large surface and third surface machining, fourth surface machining, second surface machining, coating machining, cementing, backrest fixing, ridge surface machining and ridge surface secondary machining. According to the ridge prism cemented component production technology, a large surface, a third surface, a fourth surface and a second surface are frosted and polished in sequence, the surfaces are machined in sequence, and fixation is convenient; besides, the machining precision is high, a machining backrest does not need to be replaced frequently, and the machining efficiency is high; black paint is applied for protection after the large surface and the second surface are coated, and coatings are prevented from being damaged by collisions in the cementing machining process; the third surface is cemented and fixed with the backrest, and the machining consistency of the ridge surfaces is ensured; the ridge surfaces are subjected to secondary machining with a square brick backrest, so that the machining precision of the ridge surfaces is ensured, and the purposes of shortening the machining period, improving the working efficiency and the angle precision, reducing dimension errors and increasing the qualified rate of products are achieved.

The invention provides a method which can be implemented in a laboratory, is simple and feasible to operate and used for detecting the tensile breaking force of polyacrylonitrile-based carbon fiber cloth. The method comprises the following steps: 1, taking a sample, namely, cutting a plurality of warp-direction samples in a direction which serves as a sample length direction and is parallel to the direction of warps, and cutting a plurality of weft samples in a direction which serves as a sample length direction and is parallel to the direction of wefts; 2, treating the samples, namely, respectively intensifying the clamping sections of the wrap samples and the weft samples, uniformly coating an adhesive on the clamping sections of the samples in intensification treatment, putting the samples subjected to the adhesive coating treatment in an experiment environment to adjust the moisture content, and drying the adhesive; and 3, performing tensile experiment, clamping coated parts of the samples by using plate clamps on a testing machine, drawing the test samples at a constant speed until the samples are broken, recording the maximum force exerted when the samples are broken, respectively detecting the wrap samples and the weft samples so as to obtain multiple groups of data, and taking the average values of the data, thereby obtaining the wrap and weft tensile breaking forces of the carbon fiber cloth.

The invention discloses a high-precision online measuring instrument and a measuring method for the strip shape of a plate and strip, and relates to the measurement of the strip shape of a metal plate and strip. The method comprises the following steps of: distributing 3 beams of line laser along the motion direction of the plate and strip; irradiating on the surface, in the width direction, of the plate and strip to form 3 laser irradiation lines, wherein the included angle between the line laser and the horizontal plane is 30 to 60 degrees; shooting the changes of the positions of the laserirradiation lines on the surface of the moving plate and strip at a high speed by using three full high-definition surface scanning digital cameras above a laser irradiation area of the plate and strip; respectively sending the changes of the positions to a digital signal process (DSP) to obtain the position of a laser spot on each measurement strip; calculating to obtain the parameters of the strip shape of the plate and strip by using a measurement control cabinet; displaying the parameters on a screen of a computer; and storing the parameters in the computer. The instrument and the method have wide adaption range, high measurement precision and high measurement speed, can be used for measuring the strip shape of a cold or hot rolled metal plate and strip, and can ensure long-term reliable and stable operation in very bad environment of metallurgical production.

The invention discloses a measuring method of the flatness of a ship equipment base based on a total-station instrument. The flatness of the equipment base is measured in the construction process of aberth or a dock; the measuring method specifically comprises the following steps: welding a setting-up piece on the ship base; adjusting the total-station instrument and enabling the equipment base to be in the measuring visual angle range; establishing a three-dimensional space coordinate system of a hull and measuring relative thickness values of four corners of the setting-up piece by using the total-station instrument according to the three-dimensional space coordinate system of the hull; then calculating thickness processing data of an adjustment gasket and processing the adjustment gasket; and finally, mounting the adjustment gasket. The measuring method disclosed by the invention has the advantages of simple operation, convenience in use and wide applicability; in addition, the flatness of the equipment base is detected by using the total-station instrument, so that the final flatness of the equipment base can meet the requirements of precision design, human errors of manual measurement are reduced, the measurement accuracy is improved, the repetition reworking rate of is reduced and further the flatness of a generator pedestal panel can be conveniently and quickly adjusted.

The invention relates to a method, system, vehicle, storage medium and electronic device for balancing batteries, the battery balancing system comprises a balancing module, an acquisition module and acontrol module, the control module is connected with an acquisition module and balance module corresponding to the same single battery through a channel, and the acquisition module and the balance module commonly uses the channel at time divisions. The method comprises the following steps: the control module acquires an SOC value of each single battery in a battery pack; the control module determines a reference SOC value according to the SOC value of each single battery in the battery pack; and the control module determines a single battery to be balanced according to the SOC value of at least one single battery in the battery pack and the reference SOC value.

The invention relates to a high-temperature resistance plastics centrifugal pump, which comprises a pump body, an impeller, a pump cover, a motor, a thermostability mechanical seal component and other attached components, wherein the thermostability mechanical seal component is composed of a static ring, a moving ring, a spring seat, a static ring gland, a cooling water jacket and an acid-blocking piece; the spring seat is fixed on an impeller shaft; the outer surface of the spring seat is directly taken as a seal rotating shaft; the spring seat is provided with a spring and an O-shaped seal ring which is used for separating corrosive medium from metal pieces; the cooling water jacket is provided with a cooling water nozzle and a framework oil seal; the framework is matched with the spring seat to form the cooling water seal; the pump body, impeller and pump cover form a flow passage component of the pump, are respectively made of thermostability corrosion-resisting plastic through compression molding and comprise all-plastic and pump cover structure forms. The pump has the characteristics of being reasonable and compact in structure, reliable to mount and use, can avoid the influence on the precision of mechanical sealing by the deformation of plastics due to heating, greatly prolong the service life, can resist high temperature and effectively operate in strong corrosion environment for a long time and the like.

The invention provides a variable optical attenuator control method and system based on automatic calibration and intelligent learning. The control method comprises an automatic attenuation calibration process, a rapid attenuation control process and an intelligent self-learning process. During the automatic attenuation calibration process, a to-be-calibrated queue is determined, an attenuation value of a variable optical attenuator is set to be a minimum value, a parameter setting value of the variable optical attenuator is increased gradually by a minimum step size, and a corresponding calibration parameter value of the to-be-calibrated attenuation value is obtained. During the rapid attenuation control process, a position of a target attenuation value in a calibrated queue is searched and confirmed, a corresponding target setting parameter value of a target attenuation value is calculated, and setting and fine tuning are carried out based on a result. And during the intelligent self-learning process, a current actual light attenuation value is obtained based on sampling and correction is carried out when determination is needed. According to the invention, an automatic attenuation calibration way without manual intervention is provided; long-term influences caused by factors of an environment and device aging and the like can be eliminated based on intelligent self-learning control; and the control precision is guaranteed.

The invention provides a thermal flow sensor, comprising a power circuit, a field-effect tube, a Wheatstone bridge, an operational amplifier circuit and a microcontroller, wherein the drain of the field-effect tube is connected with the power circuit; the Wheatstone bridge comprises two bridge arms on which a heating resistor and a temperature sensitive resistor are respectively arranged, and the common point of the two bridge arms is connected with the source electrode of the field-effect tube and serves as a detecting voltage output point reflecting the current air mass flow; the operational amplifier circuit is respectively connected with the intermediate nodes of the two arms of the Wheatstone bridge, and the output end of the operational amplifier circuit is connected to the grid electrode of the field-effect tube to adjust the current flowing through the heating resistor by controlling the current flowing out from the source electrode of the field-effect tube and ensure that the surface temperature of the heating resistor remains stable; and the input end of the microcontroller is connected with the source electrode of the field-effect tube and used for processing the detecting voltage of the source electrode of the field-effect tube and outputting a frequency signal showing the current air mass flow. The thermal flow sensor has the advantages of high precision, and strong stability.

The invention discloses an agricultural information acquisition device convenient to install. The device comprises a supporting seat, a rainfall sensor, a solar cell panel, a storage battery, a communication module, a temperature and humidity sensor, a wind direction sensor and an illumination sensor; the lower surface of the supporting seat is fixedly connected with a moving structure; a groove is formed in the middle of the lower surface of the supporting seat; motors are fixedly connected to the two sides of the upper surface of the inner cavity of the groove; and limiting blocks are fixedly connected to the positions, corresponding to the motors, of the two side walls of an inner cavity of the groove. The output end of each motor is fixedly connected with a first lead screw, the otherend of the first lead screw is rotatably connected with a bearing seat, the bearing seat is fixedly connected with the inner side wall of the groove, the first lead screw is slidably connected with asliding plate, the lower surface of the sliding plate is fixedly connected with an inserting rod, and the upper surface of the supporting seat is fixedly connected with a supporting rod. The acquisition device is simple in structure, convenient to use, simple to mount and dismount, convenient to maintain, convenient to move and fix, convenient to transfer a test sample plot and good in stormy waveresistance.

The invention relates to a pig identity recognition system which comprises an identity input module, a depth image acquisition module, an image preprocessing module, a feature extraction module and afeature matching recognition module. The identity input module is used for inputting pig face basic information of each pig and establishing a feature database according to the input basic information; the depth image acquisition module is used for continuously acquiring to-be-identified pig face depth image data; the image preprocessing module is used for carrying out image smoothing and filtering processing on the acquired pig face depth image data and intercepting a face area depth image; the feature extraction module is used for performing feature extraction on the intercepted face regiondepth image to obtain face features of the to-be-identified pig; and the image recognition module is used for matching and comparing the extracted facial features with the sample feature data in the feature database to obtain matching similarity and outputting a matching result. The method can be widely applied to the field of pig identity recognition.

The invention relates to a photonic suspension gyroscope based on a double-beam optical trap system. A half-wave plate, a polarization beam splitter and a lambda/4 slide are utilized to modulate lightoutput by a laser into two beams of circularly polarized light with the same light intensity, wherein the circularly polarized light is focused and input into a vacuum chamber through a lens. A corresponding relation exists between the light intensity detected by two photoelectric detectors and an included angle alpha of linearly polarized light and the maximum inertia main axis, wherein the ratio of the light intensity of e light to the light intensity of the o light is tan 2 alpha, namely, a deflection angle alpha can be obtained through the measured light intensity, so that the deflectionangle of the photonic suspension gyroscope can be determined. The device has no mechanical contact, so that influence of a supporting shaft on the precision of the whole system is overcome, the errorcaused by frictional resistance between the supporting shaft and a rotor is avoided, the service life of the system is prolonged, and relatively high precision can be achieved.

The invention relates to a two-time positioning construction process for pre-buried channels of an overhead line system of a high-speed railway tunnel. By adjusting the procedure of installing the pre-buried channels, a larger operation space is provided for construction, and operators can conveniently and rapidly install channel sets on a lining trolley and can rapidly install C type channel sets, D type channel sets and E type channel sets by standing on edges of the lining trolley by means of frames such as ladders. The channels can be positioned in advance while secondary lining reinforcing steel bars are bound, time is used while the space is used sufficiently, multiple steps are executed at the same time and do not affect one another, and the result is gained with half effort.

The invention discloses a weighing detecting system and method for a kitchen waste vehicle. The system comprises a bucket hanging device, a lifting mechanism, at least two tension sensors, at least two in-place detecting sensors and a control display, wherein the in-place detecting sensors are used for triggering and stopping the collection of tension data by the tension sensors, the upper end ofthe lifting mechanism is arranged on the waste vehicle, the lower end of the lifting mechanism is fixedly connected to one end of at least one of the tension sensors, the other end of the corresponding tension sensor is fixedly connected to the bucket hanging device, the in-place detecting sensors are arranged at one side of the bucket hanging device, and the control display is electrically connected with the lifting mechanism, the tension sensors and the in-place detecting sensors respectively. The weighing detecting system and method for the kitchen waste vehicle have the advantages that theinstallation method is simplified, the friction between a bucket lifting device and a rail part is reduced, and the weighing precision is improved; fixed-point data collection is adopted, thereby ensuring the stability of weighing data; the net weight of each-time weighing is obtained by the difference between lifting measurement and lowering measurement, and the precision of weighing is improved.