80results about How to "Realize accurate calculation" patented technology

The invention discloses a V2X-based vehicle-vehicle collision detection method and application system. The application system comprises a data interaction module (1), a coordinate transformation and projection module (2), a safety distance calculation module (3), and a collision risk detection module (4). The data interaction module is used for realizing message parsing and packaging of automotivemotion state original data and a V2V communication message set. The coordinate transformation and projection module is used for realizing conversion from a geocentric geodetic coordinate system to aGaussian plane coordinate system based on a vehicle carrier. The safety distance calculation module is used for calculating an estimated automotive motion distance and an automotive plane vertex coordinate and realizing collision risk prediction by introducing a safety distance parameter. And the collision risk detection module is used for determining whether coverage areas between every two automobiles are overlapped to realize collision detection. According to the invention, the V2X-based vehicle-vehicle collision detection method and application system are based on the BSM automobile basicsafety attribute message of V2V communication broadcasting. The automobile body size parameters are introduced to realize accurate automobile body edge calculation, thereby improving the collision detection accuracy and realizing collision detection.

The invention discloses an unmanned aerial vehicle (UAV) position and orientation estimation method based on cooperative target characteristic lines, which is characterized by comprising the following steps: (1) pre-processing an input image to obtain two groups of parallel lines of a cooperative target; (2) analyzing and calculating vanishing line equations for extracted parallel lines to obtain slopes of vanishing lines so as to calculate the roll angle of the UAV; and (3) directly obtaining the yaw angle of the UAV according to the image, substituting known coordinates of four points in the relation equation of a camera coordinate system and a world coordinate system of the UAV, and calculating out the other four position and orientation parameters. The invention can realize accurate calculation of the UAV position and orientation information.

The invention provides a control method for preventing a steel coil inner ring from core pulling during coil stripping of a coiling machine. The control method for preventing the steel coil inner ring from core pulling during coil stripping of a coiling machine comprises the steps that the position of a tong opening is detected after coiling is finished; an ideal shearpoint of strip steel is calculated; a strip tail is positioned; and automatic coil stripping is conducted. The phenomena of jamming of a strip head, scratching of the steel coil inner ring and core pulling during coil stripping can be completely eliminated by adopting the control method for preventing core pulling of the steel coil inner ring during coil stripping of the coiling machine.

The invention discloses a method for acquiring a resistance of a power station or transformer substation grounding grid with karst geological and geomorphic characteristics. The method comprises the following steps of: step I, determining a grounding soil resistivity and a test point; step II, calculating a resistance of a main grounding grid; step III, calculating a resistance of an auxiliary grounding grid for reducing a soil resistivity; and step IV, calculating the resistance of the power station or transformer substation grounding grid with the karst geological and geomorphic characteristics. According to the method for acquiring the resistance of the power station or transformer substation grounding grid with the karst geological and geomorphic characteristics, two technical problems of non-uniform soil resistivity and ultrahigh soil resistivity of the grounding grid with the karst geological and geomorphic characteristics are solved.

The invention discloses a measuring method of a three-dimensional movement track of a moving vehicle based on a vehicle body control point. The measuring method comprises the following steps of: 10, building a vehicle body control point database; 20, acquiring the three-dimensional coordinate of the vehicle body control point of the moving vehicle; 30, measuring a transformational relation between the three-dimensional coordinate systems of the vehicle body of the moving vehicle at different moments and an image space coordinate system; and 40, measuring the three-dimensional movement track and the gesture change of the moving vehicle. According to the measuring method, the moving vehicle is subjected to close-range photogrammetry by fixed photography equipment based on the vehicle body control point on the moving vehicle, so the accurate measurement of the vehicle speed and the gesture of the vehicle in a driving process can be conveniently achieved.

The invention discloses a method for calculating high-frequency loss of a magnetic core under symmetric/asymmetric rectangular voltage excitation, and the method comprises the steps: deducing ascending branch and descending branch magnetization rate expressions of corresponding trapezoidal and triangular magnetic flux density waveforms according to symmetric and asymmetric rectangular voltage excitation waveforms; calculating a static hysteresis loop and hysteresis loss of the thin strip-shaped soft magnetic material by adopting an Energitic static hysteresis model; deducing an eddy current loss correction coefficient according to the magnetization rate expressions of the ascending branch and the descending branch; deducing a residual loss correction coefficient according to the magnetization rate expression; and calculating a dynamic loss parameter according to the sine loss density of the thin strip-shaped magnet material in one magnetization period under different frequencies and different peak magnetic densities. Based on the derived expression, a calculation process of the thin strip-shaped soft magnetic material high-frequency loss calculation method is established. The method can be used for accurately calculating the magnetic core loss of the high-frequency transformer in the full-bridge DCDC converter and the inductor in the Boost type DCDC converter, and effectively separating the components of the magnetic core loss.

The invention provides a method and a device for calculating direct-current interference on a buried metal pipeline. The method comprises the following steps: acquiring a first polarization curve of acoated pipeline; segmentally and linearly fitting the first polarization curve to obtain coating surface resistivity, a metal working potential and a fitting polarization potential interval of each segment of fitting straight line; segmenting the coated pipeline, and assigning a value to each pipeline segment respectively in order to calculate a polarization potential at each position of the coated pipeline; and performing an iterative calculation on the polarization potential of the coated pipeline till a difference value between two adjacent calculations of the polarization potential at each position of the coated pipeline is within a threshold when the polarization potential of at one position is outside the fitting polarization potential interval, and determining the polarization potential at each position on the coated pipeline. Through adoption of the calculation method provided by the invention, a calculation result is closer to an actual situation under the consideration of the calculation of the polarization effect, so that the accuracy of a calculated result is further increased, and the likelihood of occurrence of electric corrosion is accurately assessed.

The invention relates to an electric energy charging method considering the harmonic wave electric energy loss of a load. The method comprises steps as follows: step 1, the harmonic wave electric energy loss of a single-phase rectification load is determined: S1, a load frequency domain harmonic wave analytical model is established; S2, according to the load frequency domain harmonic wave analytical model, each sub-harmonic current on the alternating current side of the load is determined in combination with the voltage harmonic wave condition at the single-phase rectification load end; S3, an active power analysis formula and a reactive power analysis formula of each sub-harmonic wave of the load are acquired on the basis of each sub-harmonic current on the alternating current side of the single-phase rectification load; S4, the harmonic wave electric energy loss of the single-phase rectification load is acquired; step 2, the actual electric energy consumption of the single-phase rectification load is the difference between the measured electric energy consumption of the single-phase rectification load and the harmonic wave electric energy loss of the single-phase rectification load, and then the actual electric charge of the single-phase rectification load is acquired according to the current market price of electric energy. The method considers the harmonic wave electric energy loss of the load, so that compared with the prior art, the method can accurately charge the electric energy consumed by the load.

The invention discloses an oil-gas pipeline polarization potential monitoring device, and relates to the technical fields of general corrosion prevention of a metal material, and pipeline systems. The device comprises a current interrupter, a couple corrosion meter, an adjustable resistor, a data collector, a probe, a portable reference electrode and a computer, wherein the negative end of the current interrupter is connected to the cathode of a pipeline test pile or a constant potential instrument, the positive end of the current interrupter is connected to one end of the couple corrosion meter, and the other end of the couple corrosion meter is connected with a rod-shaped tube steel electrode lead of the probe, and AI8 and AI9 of the data collector respectively through the adjustable resistor; AI GND 3 and AI GND 6 of the data collector are connected together, and then are connected with the AI9 of the data collector, or go through the adjustable resistor and then are connected with the AI9; and AI0 and AI1 of the data collector are connected with the long-acting reference electrode lead of the probe and the portable reference electrode respectively, and the USB interface of the data collector is connected with the USB interface of the computer. The device can realize the long-term monitoring of the real polarization potential, and the accurate calculating of the polarization current density of the probe.

The invention relates to a parallel coupling marine acoustics forecasting system and an operation method, and belongs to the field of physical ocean and underwater sound field modeling fusion. The system comprises an ocean environment forecasting module, an ocean-acoustics coupling module and an ocean acoustics propagation solving module; the marine environment forecasting module provides initial environment input for the system; the ocean-acoustic coupling module has the functions of parameter initialization, terrain extraction and ocean environment parameter profile extraction, and an ocean model and an acoustic model are combined together by converting parameters, including temperature, salinity and sea surface roughness output, of an ocean module into input of the acoustic model; the marine acoustic propagation solving module is used for calculating a marine sound field and outputting results including the marine sound field and the sonar operating distance. The system realizes real-time forecast of an underwater sound field, can be transplanted to any high-performance computer system, and quickly realizes accurate calculation of a three-dimensional sound field and estimation of a global sea sonar operating distance.

The invention discloses a system and method for testing the surface quality of Wolter-I-type mandrel by adopting a contact-type contourgraph. The test system consists of two portions, i.e., a countourgraph and an auxiliary adjusting apparatus, wherein the auxiliary adjusting apparatus comprises an axis-X rectilinear displacement platform, a horizontal rotary turntable, a vertical surface rotary turntable and a chuck for clamping a workpiece, the axis-X rectilinear displacement platform is fixedly installed on a table-board of a contourgraph detection platform, the horizontal rotary turntable is fixedly installed on the axis-X rectilinear displacement platform, the vertical surface rotary turntable is fixedly installed on the horizontal rotary turntable, and the chuck is fixedly installed on the vertical surface rotary turntable and used for installing and clamping the mandrel. By adopting the system and method, performance indexes of the Wolter-I-type mandrel such as dimension errors,surface roughness, corrugation degree and shape errors can be detected, no other additional ultra-precision measurement instrument is needed, the purchasing cost of the ultra-precision measurement instrument can be reduced, the measurement times can be reduced, and the measurement efficiency can be increased.

The invention discloses a wall thickness detecting device and a wall thickness detecting method for transparent and semitransparent glass bottles. The device comprises a laser emitter and an image shooting device which are correspondingly arranged relative to a normal in a detecting point on a glass bottle to be detected, wherein the emitting end of the laser emitter is toward the detecting point; a central axis of the emitting end of the laser emitter is in an acute angle to the level; an included angle between the central axis of the emitting end of the laser emitter and a normal at the detecting point is an acute angle; and light emitted by reversely refracting a laser ray from the laser emitter through the internal and external walls of the glass bottle to be detected is received via the image shooting device. The method disclosed by the invention is carried out based on the device, the wall thickness at the detecting point is obtained by calculation by measuring the pixel distance of two shot parallel light spots formed on the internal and external walls. The device and method provided by the invention are suitable for detecting the wall thickness of a colorless transparent glass bottle and semitransparent glass bottles with deep colors such as brown semitransparent glass bottle and green semitransparent glass bottle on real time in a quick, accurate and non-contact way.

The invention discloses a method for simulating the fracture toughness of a layered rock based on an extended finite element. The method comprises the following steps: establishing a Brazilian disc numerical model for simulating the fracture toughness based on the extended finite element; simulating and calculating crack initiation and propagation of cracks; defining a transverse isotropic material to describe bedding distribution characteristics in the rock mass, and promoting an isotropic molar-coulomb criterion to the anisotropic layered rock mass; taking an initial critical damage criterion of rock crack simulation as a maximum principal stress criterion, determining damage evolution and damage stability viscosity parameters based on an energy damage evolution type, specifying a contact effect of rock bedding, a matrix and cracks, and finally applying boundary conditions; extracting an analysis and calculation result, calculating the fracture toughness of Brazilian disc numerical simulation, comparing the fracture toughness value of the Brazilian disc in an indoor test, and for crack propagation of the Brazilian disc, comparing an analysis numerical value with a crack propagation condition in an actual test; and finally, achieving accurate simulation of a crack propagation path and a fracture toughness value.

The invention relates to the field of natural gas reservoir forming and discloses a calculation method for a maximum distance of natural gas lateral migration. Specifically, the method comprises the following steps of (1) determining a key reservoir forming period; (2) determining a natural gas lateral migration starting point and a migration path; (3) determining natural gas lateral migration power, migration resistance and a pressure reduction coefficient; and (4) in combination with the steps, gradually reducing the migration power according to an influence of the migration resistance in the lateral migration process of natural gas. When the migration power is smaller than the migration resistance, oil and gas cannot be migrated, and at the moment, a distance from the natural gas to themigration starting point is the maximum distance of the natural gas migration. Through the method provided by the invention, the maximum distance of the natural gas lateral migration can be quantitatively calculated; and the distribution range of a gas reservoir can be determined, thereby better guiding the selection of exploration targets and increasing the success rate of natural gas drill-up targets.

The invention provides an accurate flow calculation method for distributed wind power integration distribution networks. The method comprises the following steps of: S1, acquiring power grid data, wind turbine generator data, wind power plant wind direction and wind speed data; S2, determining a determination relationship among the wind direction, a wind speed and a temperature according to an FPIatmospheric wind speed and temperature basic principle, so as to correct resistance; S3, importing probability density models of the wind direction and the wind speed; and S4, carrying out accurate flow calculation by utilizing the corrected resistance value and applying the probability density models of the wind direction and the wind speed to flow distribution calculation. The method is capableof providing accurate probability flow calculation for distributed wind power integration distribution networks, considering the integration characteristics of distributed wind power, and realizing an accurate probability flow algorithm for the distributed wind power integration distribution networks through obtaining data of the wind power plant wind speed and wind direction and the probabilitydensity models. The method is capable of solving the problem that the wind speed is uncertain in the prior art, realizing accurate calculation of flow distribution and improving the calculation accuracy.

The invention discloses a tailing pond dry beach length automatic monitoring method comprising the following steps: S1, through unmanned aerial vehicle photography surveying and mapping, a tailing pond high-precision orthoimage and a three-dimensional model including a digital orthoimage map DOM and a digital earth surface model DSM are established; s2, on the basis of a tailing pond digital earth surface model DSM, the total slope rate of the n section dry beaches is obtained; the average value of the total slope ratios of the dry beaches of the multiple sections is taken as the average slope ratio of the dry beaches of the dam section; extracting water level elevations of n sections and averaging the water level elevations as an initial water level elevation; fitting a function relational expression between the beach face elevation of each section and the length of the dry beach by adopting a function expression; and S3, collecting the water level elevation, uploading the collected water level elevation data to the cloud platform, calculating the current dry beach length by the cloud platform according to the initial dry beach length, the current water level elevation and the function relation between the beach surface elevation and the dry beach length, comparing the calculated dry beach length with a dry beach length early warning threshold value, and judging whether early warning is needed or not.

The invention relates to the field of plate and strip rolling, and designs a plate and strip cross section local high(sinking) point on-line identification method. Firstly, thickness distribution data of plate and strip cross section full width are obtained; a quartic polynomial and n(5<=n<=15)-period movement average line are used for fitting of thickness distribution of the plate and strip cross section full width; a quartic polynomial curve is subtracted from the movement average line, a difference value distribution curve of the thickness distribution is obtained, and the height and the width of a local high(sinking) point are obtained through the difference value distribution curve according to a certain rule; and the area of the part, exceeding a local high(sinking) point threshold value line, of the difference value distribution curve is calculated, and the local high(sinking) point height at the position of the maximum area serves as a plate and strip cross section local high point or local sinking point magnitude is obtained. By means of the plate and strip cross section local high(sinking) point on-line identification method, the problem that in the plate and strip rolling production, as the local high(sinking) point cannot be identified, accurate evaluation and control cannot be achieved is solved, and plate and strip cross section local high(sinking) point on-line identification is achieved.

The invention relates to a measuring method of motion parameter of airborne synthetic aperture radar based on a position and orientation system. The method includes obtaining the relative position and orientation relationships between an IMU at initial moment and an indexing mechanism, the indexing mechanism and an SAR antenna by using a laser total station calibration, calculating the dynamic lever-arm between IMU measurement center and SAR antenna phase center in the IMU coordinate system and the direction-cosine matrix between the spindle coordinate system and the SAR antenna coordinate system by using the turning angle output by a coded disc, and calculating the position, speed and orientation information of the SAR antenna phase center by means of dynamic lever-arm compensation by using the position, speed and orientation output by POS, and the angular speed output by IMU. The method has high calculating accuracy, is easy to realize, and can improve the measurement accuracy of the position, speed and orientation of the SAR antenna phase center, furthermore the radar imaging accuracy is improved.

The invention discloses a rotor position detection device and a positioning and operation control method for a switched reluctance motor, and the method comprises the steps that a position magnetic ring is installed on a rotating shaft of the switched reluctance motor, wherein the position magnetic ring comprises a magnetic pole N and a magnetic pole S which are alternately arranged; and a magnetic ring positioning key is installed at an alternate position and in the horizontal direction of the axis of the rotating shaft, wherein the magnetic ring positioning key and a rotor punching sheet positioning key are installed at the same position; and a stator punching sheet positioning key is installed on the axis of a stator punching sheet of the switched reluctance motor, and a Hall element isinstalled at the axis of the stator punching sheet. A rotor rotation angle is obtained according to the position magnetic ring and a pulse signal column of the Hall element in the rotation process soas to obtain a rotor position. An opening angle or a closing angle is controlled according to the rotor rotation angle and the motor interruption times of the Hall element state conversion period, soas to realize the detection of the rotor position and the control of the motor operation.

The invention discloses a drainage control method for a dyeing process. The method comprises the steps that all draining water in a main tank runs through a measuring water tank in the dyeing process;when the main tank drainage function is implemented in the dyeing process, a shaving power drainage valve is opened to pump up water to the measuring drainage tank, after the water is drained to a set water level, the shaving power drainage is switched off, and a horizontal pump is switched on to drain residual liquid into the measuring drainage tank through a power overflow drainage valve; afterwater in the main tank is drained off, the drainage valve is opened to drain off water in the measuring drainage tank; water flows into the main tank from a preparation tank, before the water inflowquantity reaches a set value, a first water inflow valve is opened, a second water inflow valve is closed, and when the water inflow quantity reaches the set value, the first water inflow valve is closed, and the second water inflow valve is opened to ensure the water inflow precision. According to the drainage control method for the dyeing process, all the draining water in the main tank must runthrough the measuring drainage tank in the dyeing process, so that the precision of the liquor ratio is ensured, the total drainage quantity is convenient to calculate, and the measuring drainage tank is used for precisely calculating the water absorption rate.

The invention provides a calculation method and a calculation device based on three-phase imbalance considering zero line loss. The method comprises the steps of obtaining basic data; constructing a transformer area calculation model according to the basic data; calculating the current of the A phase of each section of wire and the voltage of the A phase of the tail end node by the transformer area calculation model; calculating the current of the B phase of each section of wire and the voltage of the B phase of the tail end node by the transformer area calculation model; calculating the current of the C phase of each section of wire and the voltage of the C phase of the tail end node by the transformer area calculation model; and calculating the loss of each section of wire, the zero linecurrent and the three-phase imbalance degree of a transformer area at least according to part or all of the A-phase current of each section of wire, the A-phase voltage of the tail end node, the B-phase current of the wire, the B-phase voltage of the tail end node, the C-phase current of the wire and the C-phase voltage of the tail end node. According to the scheme, accurate calculation of three-phase imbalance based on consideration of zero line loss is realized.

The invention discloses an aircraft combined navigation method and device. The method comprises: reading a measurement quantity and an input quantity at a current flight moment from an onboard measurement element in a period dt, and carrying out recording; acquiring a state quantity and an input quantity which are recorded by an aircraft at a previous flight moment; according to the state quantity and the input quantity which are recorded at the previous flight moment and a process model, determining a predicted state quantity of the aircraft at the current moment; according to the predicted state quantity, the input quantity at the current moment and a measurement model, determining a predicted measurement quantity of the aircraft at the current moment; according to the predicted measurement quantity, the read measurement quantity at the current flight moment, process noise and measurement noise, carrying out data processing, and according to a result of the data processing and the predicted state quantity, determining a state quantity of the aircraft at the current flight moment, and carrying out recording. According to the scheme, accurate calculation on a flight state of the aircraft is implemented.

The invention discloses an earthwork amount calculation method based on an improved constraint irregular triangulation network construction method. The earthwork amount calculation method comprises the steps: generating an unconstrained Delaunay triangulation network according to elevation data points; inserting the boundary of the engineering area as a constraint in an unconstrained Delaunay triangulation network; performing local optimization to generate a constrained irregular triangulation network; completely projecting the ground elevation on the constraint triangulation network area to obtain an original terrain triangulation network model; after the field level engineering design elevation is specified, calculating the earthwork filling and digging amount on each triangular net unit; and accumulating the triangular net earthwork volume in the engineering area to obtain the total earthwork filling and digging volume. The method has the advantages that the problem that the earthwork amount calculation error is large due to large topographic altitude difference fluctuation can be avoided, the earthwork amount suitable for complex topography and landform of the mountainous region of eastern Zhejiang is accurately calculated, the earthwork amount calculation error is effectively reduced, and the field level engineering earthwork amount calculation precision is optimized.