147results about How to "The calculation method is accurate" patented technology

A method for calculating the required cylindrical power of a toric implant by using both the measured pre-operative corneal/ocular astigmatism and the predicted surgically-induced astigmatism. The post-operative corneal/ocular astigmatism is predicted using power vector analysis of the surgical technique employed by the surgeon. Such a method provides a more accurate method of calculating the required spherocylindrical refractive power of the implant. The method can be implemented manually, but preferably is automated by implementation on a computer through appropriate software.

The invention relates to a face recognize system, comprising a network interface module, a dual-core chip SOC module connected with the network interface module, a CPLD address code, a DDR2 high-speed operation memory, and an external program memory, or even with a hard disk with an IDE. The dual-core chip module is connected with the high-speed operation memory via a data bus. The CPLD address code via an EMIF bus is connected with the external program memory NAND Flash or connected with the IDE hard disc too. And the whole system is powered by a power module. The recognize method comprises video code compression, pretreatment, motion check, face positioning, organ positioning, normalizing, character extraction, face comparison, and data communication. The invention has the advantages in high recognize rate and high recognize speed, strong data processing ability, better compatibility with prior detect network, stable operation, easy upgrade and maintenance, with low cost.

The invention discloses a fatigue life prediction method for a friction stir welded component based on small crack propagation, and belongs to the technical field of fatigue diagnosis and analysis ofmechanical structures. The method comprises the steps that a bone-shaped flat plate sample is prepared, fatigue small crack propagation replica tests under different stress loads and different stressratios are conducted on different areas of a joint, and a secant method is adopted for calculating the propagation rate of small cracks; a New-Raju model is adopted for calculating the stress intensity factor range of the small cracks of the joint; c values in the depth direction and a/2 values in the vertical direction of semi-arc shapes of fatigue crack propagation zones in fracture shapes of different areas of the joint, and the depth-to-length ratio 2c/a of the cracks is calculated; a curve of the propagation rate of the cracks along with the change of the stress intensity factor range isdrawn; an effective stress intensity factor is calculated; a formula of the propagation rate of the small cracks is determined; an initial crack size a0 and a critical crack size ac are determined; the formula of the propagation rate of the small cracks is integrated to obtain the fatigue life of the welded component. By means of the scheme, the fatigue life of the friction stir welded component can be more easily and accurately predicted.

The invention discloses a method and device for measuring the temperature and strain of isotactic ultralow-reflectivity optical fiber gratings simultaneously based on Brillouin scattering. The method includes the steps that the ultralow-reflectivity optical fiber gratings are continuously and dynamically etched through monopulse laser energy based on the drawing tower technology to obtain high-capacity optical fiber grating array sensing fibers, wherein m optical fibers and 2*m optical switches are connected to serve as a sensing probe; the reflection center wavelength lambda[i] and Brillouin frequency shift v[i] of each optical fiber grating are obtained through a high-speed CCD wavelength demodulation module and a Brillouin frequency shift heterodyne demodulation module; solving is carried out according to the Brillouin frequency shift and temperature and strain parameters of the optical fiber gratings to obtain the temperature and strain of the optical fiber gratings at each position. The method and device overcome the defects that the Brillouin sensing technology is low in precision and low in speed, simplify high-capacity ultralow-reflectivity optical fiber grating array optical fiber cabling complexity, improve high-capacity ultralow-reflectivity optical fiber grating array optical fiber cabling operability, overcome the cross sensitivity of the temperature and strain of the optical fiber gratings and improve distributed sensing detection precision.

The invention is a building approach for space-borne polarization SAR Faraday rotation effect correction platform, which has eight steps. Step 1: The linear-polarization SAR complex image data format processing; Step 2: The linear-polarization SAR complex image data memory block processing; Step 3: The complex covariance matrix calculation of SAR image data block; Steps 4: The imaginary part construction complex number statistics based on the complex covariance; Step 5: Calculate the phase angle of the complex number statistics to obtain the estimated value of the Faraday rotation angle omega; Step 6: Use the global navigation system TEC data to obtain the estimated value of Faraday rotation angle of non-ambiguity omega; Step 7: Use omega for correction processing on the effect of ionospheric Faraday rotation; Step 8: In accordance with Step 3 to Step 7, conduct the correction processing of Faraday rotation effect on each complex image data block until the completion of correction processing. The invention presents a complete solution to the angle ambiguity in the existing Faraday rotation estimation method and has a wide range of practical value and application prospect.

The invention discloses a blood flow speed calculation method based on X-ray coronary angiogram images. The method includes the following steps that the X-ray coronary angiogram images are loaded; theheart rate of a patient is acquired; angiogram image information is extracted, and three-dimensional synthesis data of a two-dimensional blood vessel is acquired based on a three-dimensional synthesis method; the number of frames through which the images walk in one cardiac cycle is calculated; the initial point and the end point of one cardiac cycle are acquired respectively on images corresponding to a two-dimensional initial frame and a two-dimensional end frame, and then the blood vessel length of one cardiac cycle is cut out in the three-dimensional synthesis data through the initial point and the end point; the blood flow speed is calculated. The method has the advantages that by recognizing the initial point and the end point on the images corresponding to the initial frame and theend frame in one cardiac cycle, based on the blood vessel length acquired through three-dimensional reconstruction, the average flow speed of blood in one cardiac cycle is determined, and the more accurate coronary blood flow speed calculation method is provided for doctors.

The present invention relates to an attitude adjustment method for curve stripe imaging in agile satellite maneuver. The method comprises the following steps that: (1) a polynomial model between the position coordinates of a curve target under an earth-fixed reference system and imaging cumulative time is established; (2) the roll angle and pitch angle of a satellite are calculated according to the polynomial model of the curve target obtained in step (1); and (3) the yaw angle of the satellite is calculated according to the polynomial model of the curve target obtained in step (1) and the roll angle and pitch angle obtained in the step (2). The method can support the one-time continuous imaging of curve targets along highways, coastlines and borderlines and can significantly improve the use efficiency of the in-orbit operation of the satellite. According to the method, the influence of the ellipticity of the earth is considered, and therefore, the target can be covered more accurately, and imaging quality is high. The method can be applied to the attitude planning of curve strip imaging in agile satellite maneuver.

The invention relates to a calculation method for vibration absorber isodesmic annular superposed valve plate deformation and belongs to the technical field of vibration absorbers. At present, no reliable calculation method is provided for the vibration absorber isodesmic annular superposed valve plate deformation; and most methods are used for entity modeling and simulation by using ANSYS and cannot meet requirements on vibration absorber design and characteristic simulation and superposed valve plate design. The calculation method is characterized in that deformation of annular superposed valve plates, which has the same material characteristics and of which the radiuses of an inner circle and an outer circle are equal, at positions with any radius r and any valve port radius rk is precisely calculated. According to an ANSYS simulation result, the calculation method is precise; and the calculation method for the vibration absorber isodesmic annular superposed valve plate deformation is supplied to vibration absorber characteristic simulation and splitting design of a superposed valve plate.

The invention relates to a method for calculating the radial stress of an annular valve plate of a vibration absorber, and belongs to the technical field of vibration absorbers. At present, no reliable calculation method is provided for the radial stress of the annular valve plate of the vibration absorber; and most methods are used for value simulation of the radial stress under the given valve plate structure and the given pressure by using ANSYS and cannot meet requirements on the modern computer aided design (CAD) of the vibration absorber, strength checking of the annular valve plate and splitting design. By the calculation method, the radial stress at any radius position and the maximum radial stress at the inner circle radius ra according to a structural parameter and a material performance parameter of the annular valve plate of the vibration absorber. According to an ANSYS simulation result, the method for calculating the radial stress of the annular valve plate of the vibration absorber is precision; and the reliable method for calculating the radial stress is supplied to the modern CAD design and the stress strength checking of vibration absorber and the annular superposed valve plate.

The invention provides a method and system for realizing a bus dynamic arrangement model based on OD passenger flown OD passenger flow-based bus dynamic scheduling model implementation method and system. The method comprises the steps of designing an initial scheduling model, screening the scheduling model, and outputting multiple optimal scheduling models for users to select. The scheduling situation of each day can be dynamically adjusted, the efficiency is maximized, and the enterprise cost is saved under the condition that the requirements of passengers are met. The method has the advantages that the types of basic data, set constraint conditions and the like are richer and more real, various dynamic basic data are contained, more actual factors and real-time conditions are considered,and the scheduling result with higher timeliness and accuracy is dynamically generated. Whether the scheduling model meets the actual situation or not can be verified in time and correspondingly adjusted by verifying whether the time period with the highest vehicle allocation number is in the morning peak or not, the accuracy of initial scheduling is improved, and the scheduling model which doesnot meet the actual situation is prevented from entering the subsequent adjustment and optimization process. A penalty function is introduced to better fit the actual situation of an enterprise, and abnormal data is prevented from interfering with screening of the optimal scheduling scheme.

The invention discloses a system of directing-type rotary steering actuator mandrel displacement vector control. The system is of a double closed-loop structure, and comprises a ground monitoring system, a communication system, an under-shaft microprocessor, a motion control card, a mandrel polarization device and a sensor set. The communication system is used for transmitting data on the ground and under the shaft, and the under-shaft microprocessor is positioned under the shaft. The motion control card drives two servo motors in the mandrel polarization device to polarize the mandrel; the sensor set performs a real-time feedback of mandrel displacement data to the under-shaft microprocessor to form an inner ring feedback; and the sensor set performs a real-time feedback of actual drilling number data to the ground monitoring system through the communication system to form an outer ring feedback. The invention further discloses a method of directing-type rotary steering actuator mandrel displacement vector control. The calculating process of the mandrel displacement vector is simplified to be combination of two displacement vectors respectively positioned in an overall coordination system and a local coordination system. The system structure and the control method are simple, accurate guided drilling of drilling tools in a well drilling system can be realized.

The invention discloses an inverter nonlinear harmonic compensation method based on two-dimension table look-up and an interpolation method. The method comprises the steps of firstly, fixing a motor on a loader so that the motor cannot operate; secondly, injecting a rotatory current with given frequency and amplitude into the motor; thirdly, using a resonance point to conduct inhibition on a vector proportional integral controller with 6-fold frequency and 12-fold frequency of the given frequency in a rotating coordinate system of the current; fourthly, calculating per unit amplitudes of 5, 7, 11, 13 harmonics corresponding to the compensation value of each phase of an inverter and an initial phase value of each harmonic of the compensation value of each phase relative to an orientation angle of current injecting; finally, obtaining a two-dimension look-up table with the amplitude and frequency of the injected current as an input variable and the amplitude of each harmonic and the initial phase value of each harmonic relative to an orientation angle of current injecting as an output. According to the inverter nonlinear harmonic compensation method based on two-dimension table look-up and an interpolation method, the capacity of resisting disturbance of noise measurement in currency detection is higher, and there is no need to cope with the problem of currency zero-crossing detection.

The invention provides a runoff data acquisition method and device, a computer device and a readable storage medium. The method comprises the steps of according to driving data of a to-be-measured area and a preset hydrological simulation model, determining the accumulated snow melting water amount, the glacier melting water amount and the accumulated snow layer maximum water holding capacity at the current moment; determining a difference value between the total precipitation of the to-be-detected area and the solid precipitation of the to-be-detected area as a liquid precipitation within a preset time period; obtaining the water holding capacity at the current moment according to the water holding capacity at the previous moment, the re-freezing water amount of the accumulated snow layerat the previous moment and the water holding variation at the previous moment; according to the accumulated snow melting amount, the glacier melting amount, the liquid precipitation amount, the accumulated snow layer maximum water holding amount and the water holding amount at the current moment, obtaining the water holding variation at the current moment; and determining the difference value between the ideal dissolved water runoff and the water holding variation at the current moment as the actual runoff data at the current moment. According to the method, the calculation accuracy of the runoff data of the to-be-measured area is improved.

The invention discloses an asphalt pavement structure depth calculation method based on a generalized regression neural network. The method comprises steps of collecting two-dimensional images of thesurfaces of the prepared concrete test piece before and after sand laying; reconstructing a pavement texture three-dimensional model according to the gray value of the two-dimensional image; calculating a sand paving plane of the sand paving image by using a digital image processing technology; meanwhile, the sand laying plane is also a reference surface of the pavement texture three-dimensional model; fitting the pavement texture three-dimensional model above the reference surface by adopting a least square method, and generating a fitting curved surface; calculating the volume between the two sides of the reference surface and the three-dimensional model according to an integration method; wherein the ratio of the volume to the projection area of the pavement texture three-dimensional model on the horizontal plane is the average elevation Ha of the asphalt concrete test piece image; and taking the average elevation Ha, the extreme value and the gray average value of the test piece image as input samples of a generalized regression neural network, taking the actual pavement construction depth as output samples, carrying out neural network model training, and predicting the pavement construction depth by using the trained model, with the prediction precision reaching 90% or more.

The invention discloses a three-stage energy absorption support design method for a coal mine rock burst roadway. The method comprises the following steps: acquiring roadway surface displacement R caused by the most serious rock burst of a mine, a maximum energy value EL monitored by a mine micro-seismic system and a distance L0 between a maximum micro-seismic source and a roadway damage point; calculating a roadway surrounding rock impact loosening radius R0; calculating loose surrounding rock impact kinetic energy Ec within the roadway strike length; selecting energy-absorbing anti-impact anchor cables, energy-absorbing O-shaped sheds and energy-absorbing hydraulic supports as energy-absorbing supporting components to form a first-stage anti-impact energy-absorbing supporting mode, a second-stage anti-impact energy-absorbing supporting mode and a third-stage anti-impact energy-absorbing supporting mode; and calculating energy absorption support parameters by adopting a successive progressive method according to an energy balance principle to determine an energy absorption support mode. According to the design method, different energy absorption supporting modes and supporting parameters can be selected according to different released energy of the non-impact ground pressure, so that quantitative design of energy absorption supporting of the impact dangerous roadway is realized; and safety accidents caused by the fact that technicians select supporting parameters only according to experience or engineering categories and the anti-impact capacity is too small or the phenomenon that the supporting cost is increased due to the fact that the anti-impact capacity is too large are effectively avoided.

The invention discloses an attitude adjustment method of an agile satellite imaging along an inclined stripe during maneuvering. The method comprises the following steps: computing a position vector of a photography point in an earth-fixed coordinate system at any imaging moment through the establishment of a circle locus model between the position coordinate of the inclined stripe in the earth-fixed coordinate system and the imaging accumulated time, and further computing the rolling angle, pitch angle and drift angle of the satellite at the moment. More accurate satellite expected attitude can be obtained on the premise that the influence of ellipticity of the earth is taken into account, the requirement on high pointing to the ground is met, the situation that a target cannot be coveredwhen the field angle of a camera is small is effectively avoided, the reliability is high, and the stability is good.

The invention discloses a method for calculating a resistance coefficient of an arbitrarily combined bent pipe. The method for calculating the resistance coefficient of the arbitrarily combined bent pipe is characterized in that the resistance coefficient of each elbow and each connecting section straight pipe is obtained through a parameter correction method, then the resistance coefficient of each part is superposed and thus the resistance coefficient of the entire combined bent pipe is calculated. The method for calculating the resistance coefficient of the arbitrarily combined bent pipe can be used for calculating the resistance coefficient of the combined bent pipe with different relative curvature radiuses and connecting section lengths, and the result is more accurate and reliable.

The invention discloses a single-cylinder engine bench experiment system with the reverse towing function, and a control method of the single-cylinder engine bench experiment system. The system comprises a dynamometer, a signal acquisition system, an experiment cylinder and other cylinders both isolated from a multi-cylinder engine. The experiment cylinder is provided with an experiment cylinder air inlet system, an experiment cylinder air exhaust system and an experiment cylinder air inlet channel oil injection system. Other cylinders are provided with other cylinder air inlet systems and other cylinder air exhaust systems. The experiment cylinder and other cylinders simultaneously have an in-cylinder direct injection oil spraying system. According to the invention, a method for achievinga preset rotating speed of the experiment cylinder is realized through the reverse towing of other cylinders. Therefore, the requirement of an experiment bench on the dynamometer is simplified. The air inlet pressure, the air inlet temperature and the rotating speed of the experiment cylinder are maintained at constant values through intelligently controlling the experiment cylinder after the adoption of different oil spraying strategies by the experiment cylinder. Compared with a method for calculating the indicating power of the experiment cylinder according to the instantaneous pressure inthe cylinder, the above calculation method for calculating the indicating power of the experiment cylinder is more accurate.

The invention relates to a flow state identification-based radial gate overflow calculation method. The method comprises the following steps of: calculating an after-jump conjugate depth of water jumpbehind a gate; calculating an energy consumption ratio; judging a flow state of a lockage water flow; establishing a flow coefficient calculation model; and calculating a gate overflow. According tothe method, flow states of gate hole submerging effluents are subdivided into a high Froude number area and a low Froude number area, the energy consumption ratio is taken as a judging parameter, andthe judging condition is that the flows, the energy consumption ratios Er of which are higher than 1, are submerging effluents of low Froude number and the flows, the energy consumption ratios Er of which are smaller than 1, are submerging effluents of high Froude number. Through the establishment of the judging, theoretical support is provided for the accurate calculation of lockage flows. According to the method, different flow states of lockage water flows are divided through identifying parameters, calculation models of corresponding flow states are established, and test data is used for fitting parameters in the models so as to give an accurate lockage flow calculation method.

The invention relates to a simulation method in the technical field of electric power system simulation, in particular to an open loop distribution network power flow simulation method based on multi-agents. According to the method, a feeder line section is divided into a bus feeder line section, a load feeder line section and a terminal feeder line section, different agent models are respectively built, meanwhile, the content formats of information packets and the information exchange ruler and mode among the agents are determined; after different agents are initialized, the calculation finishing rulers of each agent are set, each agent receives the information packets and carries out calculation, the calculation stops after the rulers are met, and finally, distribution network power flow simulation calculation results are obtained. The method has the advantages that the physical principles of each key element equipment in a distribution network are simulated, the simulation method can be applied to distribution systems with the complicated structure, the whole topological analysis storage on a distribution network is not needed, in addition, PV (peak voltage) nodes can be easily processed, for the large-scale complicated distribution system in the future, the requirements of a plurality of control centers and calculation implementation can be met, and the power flow simulation analysis capability of a management system is greatly improved.

The invention relates to a lung motion estimation method based on a priori statistical motion model and self-adaptive registration. The method comprises the steps that S1 chest CT images of two phases of breathing beginning and end of groups of patients are acquired; S2 lung tissue image segmentation is carried out on the images; S3 the chest CT images of two different breathing phases of each group of patient are registered; S4 the lung parenchymal motion information is extracted; a lung breathing motion sample database is established accordingly; and the EI time CT image of each group of sample and the EI time CT image of the first group of sample are registered to acquire a conversion matrix between the samples; S5 the EI time overall lung CT and a group of EE time lung lesion area CT of a group of new lung motion model are acquired; S6 ten groups of feature dot pairs are selected from two kinds of new CT; S7 a sparse priori motion model is generated; and S8 the accurate motion information in the lesion area is acquired. Compared with the prior art, the method provided by the invention has the advantages of fast calculation speed, convenient realization, flexible application and the like.