193 results about "Mathematical relation" patented technology

The present invention relates generally to the field of information processing by digital computers and, more particularly, to the entry and processing of information by application programs, particularly spreadsheets. The present invention is an electronic mathematical model builder that comprises a memory for storage of data, a processor for defining addressable sets of cells stored in the memory with a unique identifier, for entering data into the cells and for processing data stored in the cells, a user interface with a display for displaying sets of cells in a work area and means for creating and positioning sets of cells in the work area and inputting data to be entered into the cells, and a function builder for building mathematical relations between cells, comprising fields for user specification of a desired function by mathematical operators and input variables of the function, and set of destination cells containing values of the function.

The invention provides a distributed photovoltaic automatic generating control method based on sensitivity. The control method includes the following steps: a) solving the mathematical relation of the power distribution network node voltage disturbance amount and node injection active-reactive disturbance amount through the local linearization around the distribution network stable-state operation working points, namely, analyzing the variation relation of the node voltage amplitude and node active-reactive injection through a sensitivity analytical method; b) based on the sensitivity relation of the node voltage and the node injection, selecting a node having the highest voltage sensitivity of the node active-reactive injection to the node voltage threshold-crossing or widely fluctuating nodes in a distribution network as an active-reactive adjusting node to participate in the active-reactive optimization regulation, wherein a photovoltaic power generation system which doesn't participate in the adjustment always works at the largest power tracking state; and c) establishing a distributed photovoltaic optimization model by taking the distribution network distributed photovoltaic output maximization and node voltage rated value deviation minimization as the target and taking the active-reactive output value of the active-reactive adjusting node as a solving variable.

The invention relates to a high speed multi-dimensional vibration measuring device and method based on a stripe target. The device comprises a stripe target, an imaging module, a signal control and processing module and a display module. The method includes the following steps: arranging the stripe target on a vibration structure to be measured; adopting an image module to conduct continuous imaging and recording on the stripe target; utilizing the imaging module to transmit the image of the stripe target to the signal control and processing module; utilizing the signal control and processing module to conduct Fourier transform on the stripes at the same position of the same stripe target in each frame of the image, adopting a certain peak value frequency correction method to accurate correct the peak value frequency, and then utilizing the imaging mathematical relation and the corrected peak value frequency to obtain a time domain curve with stripe target structure vibration, namely acquiring structure vibration signals through reduction; displaying an image processing result through a display module or conducting further data processing through vibration signals. By means of the device and method, vibration measurement of points, lines and faces in certain range is achieved, the measurement speed is high, and the accuracy is high.

Methods, computer program products and computer systems for constructing a classifier for classifying a specimen into a class are provided. The classifiers are models. Each model includes a plurality of tests. Each test specifies a mathematical relationship (e.g., a ratio) between the characteristics of specific cellular constituents. Each test is polled using characteristic values of these specified cellular constituents from the biological specimen to be classified. In some embodiments, each test has a positive threshold and a negative threshold. When the value of the test exceeds the positive threshold, the test polls positive. When the value of the test is below the negative threshold, the test polls negative. When the value of the test is between the negative threshold and the positive threshold, the test polls indeterminate. The value of each test is combined to provide a composite score. In some embodiments, positive composite scores indicate that the specimen belongs in the class associated with the model.

The invention discloses an automatic elementary mathematic algebra type question answering method and system. The method comprises the following steps of: question input; question understanding: classifying each category of elementary mathematic algebra type questions and carrying out word segmentation and part-of-speech labelling on question texts; extracting a direct statement mathematic relationship by using a syntax-semantic hybrid model and adding an implicit type mathematic relationship according to question types so as to form an algebra relationship group; machine solution: distributing variables for entities in the formed algebra relationship group, converting the algebra relationship group into an algebra equation group, obtaining an entity-variable comparison table, and automatically solving the algebra equation group by a machine; and quasi-man answer generation: recovering semantic meanings of the variables in the algebra relationship group solution process according to solution sequences of the variables and the entity-variable comparison table, and combining the question texts to form a quasi-man answer process. According to the method and system, the automation degree of answering mathematic algebra type questions can be greatly improved.

The invention discloses a distributed energy system energy optimization regulation and control method fusing demand side response. The method includes the steps that a distributed energy system optimization regulation and control model is established, and the response capacity of user refrigeration equipment is introduced to participate in distributed energy system optimization operation; through considering the heat balance equation of an intra-system building, a mathematical relation between obtained user indoor temperature and output of the refrigeration equipment is described in a quantified mode. On the basis of meeting the requirement for comfort of a user in energy using, dependency on a battery energy storage system is reduced, and economy of distributed energy system operation is effectively improved; the distributed energy system optimization regulation and control model is established, the response capacity of the user side refrigeration equipment is introduced to participate in distributed energy system optimization operation, meanwhile, through considering the heat balance equation of the intra-system building, the mathematical relation between the obtained user indoor temperature and output of the refrigeration equipment is described in the quantified mode, and the comfort of the user is guaranteed. The result shows that through introduction of the user demand response, the energy-using cost can be effectively lowered.

The invention discloses a gradient coil design method in a nuclear magnetic resonance system. The method comprises the following steps of: establishing a mathematical relation between a field expansion harmonic component and a cylindrical surface current distribution harmonic component under a spherical coordinate system based on a current distribution harmonic component coefficient capable of generating a specific target field through solving; combining the traditional harmonic method with a target field method; and introducing a simulated annealing algorithm to optimize and obtain the global optimum current distribution. The gradient coil design method can be used for designing a self-shielding gradient coil with cylindrical surface current distribution and optionally restraining the coil length, and ensures excellent linearity while the higher coil efficiency is achieved through comprehensively considering a plurality of design indexes. Since the gradient coil design method is optimized by utilizing a global search algorithm-simulated annealing algorithm, a global optimum design result is ensured. Meanwhile the position information of the actual distribution of a current lead is directly output by the design result, therefore, the engineering processing and manufacturing are facilitated.

Roughly described, standard SPICE models can be modified by substituting a different stress analyzer to better model the stress adjusted characteristics of a transistor. A first, standard, stress-sensitive, transistor model is used to develop a mathematical relationship between the first transistor performance measure and one or more instance parameters that are available as inputs to a second, stress-insensitive, transistor model. The second transistor model may for example be the same as the first model, with its stress sensitivity disabled. Thereafter, a substitute stress analyzer can be used to determine a stress-adjusted value for the first performance measure, and the mathematical relationship can be used to convert that value into specific values for the one or more instance parameters. These values are then provided to the second transistor model for use in simulating the characteristics of the particular transistor during circuit simulation.

The invention discloses a method for measuring the residual capacity of a battery in an online manner on the basis of particle swarm optimization. The method includes fully charging the lead-acid storage battery, cooling the charged lead-acid storage battery until the temperature of the lead-acid storage battery reaches the room temperature, discharging the lead-acid storage battery by a low constant current, and sampling and recording output voltages of a sensor and the residual capacity of the battery at fixed intervals; using data recorded in experiments as input data of a support vector machine and training and creating an SVR (support vector regression) model; solving parameters in the model by the aid of a particle swarm optimization algorithm to acquire a mathematical relation among the residual capacity of the battery and the output voltages of the sensor; combining the obtained relation among the residual capacity of the battery and the output voltages of the sensor with a currently measured output voltage of the sensor to acquire the residual capacity of the storage battery in the online manner. The method has the advantages that experiential knowledge and priori knowledge of designers are omitted, the residual capacity of the storage battery can be accurately and quickly acquired from the output voltages of the sensor by the aid of the few experimental data, the efficiency and the precision are high, and the method is high in practicality.

The invention discloses a robot assembly automatic hole searching method based on force feedback, and belongs to the technical field of industrial robot intelligent control; visual image processing isnot needed; and based on six-dimensional force sensor feedback information, a deviated direction and a deviated distance of a hole relative to a shaft are reasonably estimated to plan hole searchingpolicies. Through size values of the shaft and the hole in assembly, mathematical relations corresponding to the deviated distance and an equivalent force arm one to one are calculated before control.Magnitudes of horizontal torque and axial force on a horizontal plane are obtained through six-dimensional sensor monitoring force signals in the control process to calculate the equivalent force armin the hole searching process; and then, the deviated distance is determined according to a relation between the equivalent force arm and the deviated distance. Meanwhile, a corrected deviated direction is obtained according to the magnitude of each component of the torque; and then, a variable-step-length adjusting scheme is adopted according to the known deviated distance and deviated directionto realize the hole searching scheme. Finally, the shaft is inserted in the hole actively and smoothly by using a admittance control principle after the hole searching process is finished. The methodhas the following advantages: complicated visual image processing is not needed; and high efficiency and generality are achieved.

Method for calibrating and correcting the scanning distortion of any optical coherence tomography system by using reference patterns and obtaining mathematical relationships between the positions of the reference points in a reference pattern and the local coordinates of said reference points, said coordinates are obtained by means of said optical coherence tomography system.

The invention discloses a transient throttle's variable working condition driving index identification algorithm under steady speed driving, comprising: establishing transient throttle's variable working condition testing norms; acquiring the vehicle performance parameters such as the throttle opening degree, the acceleration speed, the vehicle angle, the time, the motor rotation speed and the gear information through a signal acquisition device; performing multi-source vehicle performance parameters fusion and discretization determining to obtain the segment of the smallest working unit and determining the characteristic value; obtaining all the evaluation indexes of the transient throttle's under the steady speed driving; and then establishing a mathematical relation model of the evaluation indexes and the evaluation index scores through the index characteristics. The present invention provides a method for identifying the evaluation indexes and index scores from the vehicle performance parameters for the objective evaluation of driving.

The invention relates to a sensor for measuring soil moisture and a measuring method thereof. The soil moisture sensor sends out high frequency signals through a high frequency signal source; a detection circuit converts change of a dielectric constant into direct current voltage to output; and the outputted direct current voltage and soil moisture content determine mathematical relation, so as to achieve accurate measure of water content of soil volume; and the measurement accuracy is + / - 2 percent. Because the detector head of the sensor adopts a probe type, the sensor can be embedded in a soil section to measure continuously and can also be matched with a special measuring instrument to measure in a movable circulation mode; as the circuit is relatively simple, the measuring method has low cost which is much lower than that of a TDR soil moisture tester; , and the measuring method is convenient to debug, and ensures consistency of batch production of sensors.

In order to prevent minor deviations from expected operation in a yawing system before they lead to larger deviations, there is in accordance with a method aspect of the invention disclosed monitoring and determining deviation from an expected operation in a yawing system of a wind turbine. The method includes inputting a rotation angle input to at least one of a plurality of yaw motors, sensing an angular output of at least one of the plurality of yaw motors, receiving the rotation angle input to the at least one of the plurality of yaw motors in a signal processor, receiving the angular output of the at least one of the plurality of yaw motors, comparing at least two of the received signals, and / or comparing a mathematical relation of two of the received signals with a reference, and hereby determining whether there is any deviation from the expected operation.

The invention discloses a CA double-swing-head five-axis numerical control machine tool swing head position error detection and identification method. The method comprises the steps: S1, using a detection instrument for measuring the comprehensive position deviation of the ball center of a ball head detection baseball at different positions of a swing head; S2, establishing a mathematical relationbetween the ball head baseball center position deviation and the position error term in combination with the property of a swing head position error term according to the kinematic model of the CA double-swing-head five-axis machine tool; S3, obtaining nine position error identification results of the swing head through an identification process based on the measurement data collected in the stepS1 and the kinematics error relational expression in the step S2; and S4, repeating the step S1 and the step S3, carrying out measurement for multiple times, and taking an average value of a positionerror identification result. According to the scheme, separation of the comprehensive position deviation value of the machine tool swing head can be effectively and rapidly completed, automatic detection and automatic identification are achieved by compiling a measurement cycle, and thus technical support is provided for accurate control and rapid evaluation of machine tool precision.

An MOS transistor noise model formation method comprises: obtaining current noise density Sid of the MOS transistor and test value corresponding to frequency f at normal temperature; obtaining values of normal temperature coefficient Kf0 and Af0 according to the mathematical relation of the current noise density Sid of the MOS transistor and testing value corresponding to frequency f as shown in the graph; changing the test temperature to obtain the current noise density Sid of the MOS transistor and testing value corresponding to frequency f at different temperatures; obtaining Kf0.[1+B.(T / Tn-1)] and Af0.[1+A.(T / Tn-1)] values corresponding to different test temperatures according to the mathematical relation of the current noise density Sid and testing value corresponding to frequency f; and fitting temperature T and Kf0.[1+B.(T / Tn-1)] and Af0.[1+A.(T / Tn-1)] values to obtain values of parameter A and parameter B. The invention also provides an MOS transistor noise model formation device and a circuit simulation method, which cause the simulation result in the circuit design to be more reliable by adding temperature influence in the noise model of the MOS transistor.

The invention belongs to the field of power system dispatching automation, and particularly provides an energy-saving power generation dispatching method. The method comprises the steps of: pre-defining real-time load rates of units; calculating coal consumption difference per-unit values of the units; establishing the mathematical relation among load rates, coal consumptions and discharge standards of the units according to the coal consumption difference per-unit values of the units; calculating to obtain the load rates and loads of the units according to the real-time load rates of the units and the established mathematical relation; and performing energy-saving power generation dispatching according to the load rates and the loads of the units. The technical proposal provided by the invention breaks the prior fixed thinking of 'a top table method', originates the thought and the method of linking designed coal consumption values and actual power generation equivalent load rates of the units together, constructs a related mathematic model, breaks the technical bottleneck of the field of energy-saving power generation dispatching, scientifically solves the important problem of implementing an energy-saving power generation dispatching principle into the actual establishment of power generation plans, and has important significance in the concrete implementation of energy-saving power generation dispatching.

The invention discloses a system and a method for measuring the centre position and the exradius of a ring by utilizing snubber rolls. The system for measuring the centre position and the exradius of the ring by utilizing the snubber rolls comprises the ring. One side of the ring is symmetrically provided with a snubber roll I and a snubber roll II which are contacted with the outer wall of the ring; the two snubber rolls are respectively connected with corresponding oil cylinder II and oil cylinder II through respective snubber arm I and snubber arm II; corresponding displacement sensors arerespectively arranged in the two oil cylinders; the inner wall of the ring is provided with core rolls contacted with each other; and the outer wall of the ring is contacted with a main roll. According to the method for measuring the centre position and the exradius of the ring by utilizing the snubber rolls, a mathematical relation between the centre position and the exradius of the ring and thestrokes of the two oil cylinders is derived through establishing a system of rectangular coordinates. The strokes of the two oil cylinders, which are measured by the displacement sensors arranged in the oil cylinders, are substituted into calculation software, and thus, the numerical values of the instant centre position and the exradius of the ring can be obtained, and simultaneously, whether the ring deviates or not and the offset when the ring deviates can be discovered according to the centre position, and the out of roundness of the external diameter of ring can also be detected. By applying the method, a measuring roll system of a traditional ring rolling machine can be removed, the method is easy to implement, the cost is reduced, and the precision is higher.

The invention discloses a rapid detection method for trace TCDD (Tetrachlorodibenzo-p-dioxin). The method comprises the following steps: preparing an SERS (Surface Enhanced Raman Scattering) substrate for detection by using methylcellulose, sodium citrate and a silver-ammonia solution as raw materials; mixing TCDD solutions with different concentrations with the substrate, carrying out centrifugal separation on the obtained mixture, and testing the obtained object by using a laser Raman spectrometer so as to obtain an SERS spectrum chart of TCDD; obtaining a relation between a TCDD Raman spectrum absorption intensity with a certain wave number and a TCDD concentration, and establishing a mathematical relation between the Raman spectrum absorption intensity and the TCDD concentration; and testing a TCDD solution with an unknown concentration by using the laser Raman spectrometer, and according to the mathematical relation between the Raman spectrum absorption intensity with the certain wave number and the TCDD concentration, calculating the TCDD concentration. The method disclosed by the invention solves the problems that current TCDD detection cost is high, and samples are required to be subjected to multi-step separation, and the like, has the advantages of easiness for operation, high sensitivity, and capability of reducing a lot of economic and time costs, and has a wide application prospect.

The invention relates to an oil paper insulation micro-water content evaluation method utilizing mixed polarization model parameters. The method comprises the following steps: firstly, solving a mixed polarization model parameter insulation resistance Rg based on a plurality of groups of FDS test data of oil paper insulation test articles with different micro-water contents; analyzing a change rule of the Rg along with the micro-water content, fitting a mathematical relation between the Rg and the micro-water content, and finally verifying the effectiveness and feasibility of the mathematical relation through examples, thereby providing the oil paper insulation micro-water content evaluation method utilizing the mixed polarization model insulation resistance.

The invention relates to a parameter optimization configuration method for a modular multilevel DC transmission system. According to the method, parameters of primary devices of the modular multilevel DC transmission system are all related according to a theoretical mathematical relation, a repeated iteration adjustment and verification method is adopted, land occupation and cost are integrated, and parameter optimization configuration for the whole system is realized. a whole set of parameter optimization configuration scheme is provided for a modular multilevel DC transmission project; risks to the project by one-sided device parameter selection can be reduced; and the direct correlation between the system parameters and the system operation performance is disclosed.

The invention belongs to the technical field of non-destructive testing and relates to an ultrasonic method for determining the layer depth of defects in a laminar structure of a composite. According to the method, the time-domain characteristic of a reflection echo signal formed by broadband narrow-pulse ultrasonic waves in the laminar structure of the to-be-detected composite is used, mathematical representation functions between the time-domain characteristic of the echo signal and thickness, layer number, defect depth and the like of the laminar structure of the to-be-detected composite are constructed, a quantitative representation method, a mathematical relation and determination method and an actual measurement method of the layer depth of the ultrasonic detected defects based on the time-domain characteristic of the echo signal are established, different frequency and ultrasonic detection systems can be selected, and quantitative representation of the layer depth of the ultrasonic detected defects in the laminar structure of the composite is realized. Actual detection effects prove that the positioning deviation of the layer depth of the detected defect can reach one layer of the composite, and a very effective ultrasonic detection method is provided for defect and destruction depth setting analysis, process optimization, structure repair and the like of indoor and outdoor composites.

The invention discloses an energy saving amount determination method and device for a heating energy-saving reconstruction project. The method comprises the steps that first, mathematical relationships between energy consumption accumulation values and indoor and outdoor temperature difference time number accumulation values in a whole heating period before and after project reconstruction are determined respectively; an ideal indoor and outdoor temperature difference time number accumulation value under an ideal condition in a heating period is determined; and finally, the energy saving amount in the heating period is calculated according to the two mathematical relationships determined before and after project reconstruction and the ideal indoor and outdoor temperature difference time number accumulation value. According to the method and the device, the heating energy consumptions before and after energy saving reconstruction are corrected to the same ideal condition, then the period energy saving amount is calculated according to the heating energy consumption correction value before and after reconstruction, and therefore the problem that the result error of the period energysaving amount is large due to the fact that the outdoor temperatures before and after energy saving reconstruction are different, or the heating quality is substandard can be avoided.

The invention discloses a cutter path generating method for double blade head processing of a turbine long blade profile. The method comprises the following steps: firstly establishing a corresponding mathematical relation between cutting force and cutter shaft inclinations during blade processing so as to obtain a cutting force model of the blade processing; then acquiring section moulded line data of a blade, and determining the range of cutter location control point data of double blades in the section moulded lines of the blade, wherein the cutter location control point data comprise the step length between cutter location control points, the number of the cutter location control points and the cutter shaft inclination of a cutter at each corresponding cutter location control point; and finally determining the final offset effect of the cutting force. In the invention, the double blade head can simultaneously process parts, and the processing efficiency is obviously improved compared with a single blade by reasonably scheduling the processing technique on the parts; and besides, the double blade processing can ensure the cutting force to be greatly offset, thus the processing deformation of the parts is obviously reduced.

The invention relates to maximal posterior probability decoding and 3D block matching filtering based video de-noising method. A video is received and obtained via a prior knowledge enhanced mobile video broadcast transmission system. The de-noising method comprises the following steps that S1) a received video signal is converted into an estimated mathematical relation of the minimum mean squarederror of noise and the video signal via a space vector threshold, a maximal posterior probability decoding method is used to obtain an estimated value of the video signal, and the video signal from which part of Gaussian noise is removed is obtained; and S2) 3D block matching filtering is carried out on the video signal obtained in the step S1 to eliminate Gaussian noise further, and a final de-noised video is obtained. Compared with the prior art, the peak signal to noise ratio is higher, a better visual experience can be obtained subjectively, detail part of the video image can be remainedin a battery way, and smooth filtering is realized.

In a method for operating a MIMO radar, an influence of an object motion on an angle estimate is substantially eliminated, and a time multiplex schema having a transmission sequence and transmission instants of transmitters of the MIMO radar is identified by optimizing the following mathematical relationship: d _ pulses , opt = arg   max d _ pulses  [ Var S  ( d _ pulses ) - ( Cov S  ( d _ pulses , t ) ) 2 / Var S  ( t _ ) ] in which: dpulses,opt is optimized positions of the transmitters in the sequence in which they transmit; dpulses is positions of the transmitters in the sequence in which they transmit; t is transmission instants; VarS is sample variance; and CovS is sample covariance.

The invention discloses a laser cleaning process monitoring method based on an acoustic emission technology. A monitoring system is composed of a near-infrared nanosecond optical fiber laser processing system, a data acquisition card, preamplifiers, a signal cable and acoustic emission sensors. According to the principle of the laser cleaning process monitoring method, the cleaning effect is subjected to real-time and non-destructive monitoring based on the laser cleaning process of the acoustic emission technology; a mutual mathematical relation between the cleaning effect (the quantity of residual rust materials on the surfaces of workpieces) and the amplitude of acoustic emission signals is obtained, setting of laser processing parameters is controlled in real time, and thus laser cleaning is subjected to online and non-destructive monitoring; besides, the acoustic emission sensors are directly arranged on the surfaces of rust layers of the workpieces, the interference of other signals is reduced, and the reliability of the collected acoustic emission signals is improved. According to the monitoring system and method, the structure and use are very simple and reasonable, the precision is high, the performance is stable, the problem that an existing laser cleaning technology does not have a real-time detection function is solved, and the cleaning quality and efficiency are improved.