52 results about "Rating curve" patented technology

A measuring method for a real stress-strain curve of a metal welding structure comprises the steps: firstly, measuring a real stress-strain curve of a notch tensile test, wherein a real fracture strain at a maximum load is a strain hardening index of a metal of a to-be-measured position; calculating real stress-strain curves of notch tensile samples by finite element calculating software, to obtain the real stress-strain curves of the notch tensile samples with different notch sizes, fitting and establishing the relationship between the notch size and a geometric factor, and establishing a geometric factor expression containing the notch size and the real fracture strain at the maximum load and other influence factors; according to a load separation theory and the obtained relational expression and expression, the real stress-strain curve of the metal of the to-be-measured region of the metal welding structure is obtained. Through the small-size notch tensile test and a series of established relationships, the locality of the to-be-measured material region is accurately transmitted to a whole single-region material.

The invention discloses a ship sailing aiding and formation commanding method. When a destination and formation type is determined, a flagship plans ships to arriving set positions at set time; each ship treat a water dynamic system as a black box to invert resultant force stressed by the ship along the set sailing trajectory, sailing trajectory of each ship at the next time period is predicted according to current real-time sailing parameters and historical sailing state parameters of the ship, the predicted sailing trajectories, the planned sailing curves and real-time sailing curves are drawn together on a real-time sailing interface map, and the ships are controlled to sail along the predicted sailing trajectories; and real-time positions and real-time sailing parameters of the ships are monitored and used as the historical sailing parameters to feed back to be used for predicting sailing trajectories of the ships, and the real-time saving parameters are drawn into operation vectors tangent to the predicted sailing curves. The ship sailing aiding and formation commanding method uses a distributed control system, is flexible to control, convenient to operate, and has high fault tolerance and extensibility.

The invention relates to the field of metal forming manufacturing, in particular to a method for quickly and accurately confirming friction coefficient in metal forming processes. The method comprises n groups of ring upsetting tests: a first group of ring upsetting tests contain three samples, the dimensional proportion of the outer diameter, the inner diameter and the height of a ring sample is 3:2:1, the press-down rate is smaller than 50%, the inner diameter, the outer diameter and the height of the deformed ring sample is measured, each size is measured from three different directions and obtained from the average, the average inner diameter, the outer diameter and the height of the three samples are calculated, the radius of a neutral layer is calculated, friction factor m is calculated, and the best friction factor mi is obtained by calculation. The method is simple and practical, and simultaneously takes bulging and material hardening in the ring sample upsetting test into consideration. Thus, the defect that an existing analytic method cannot simultaneously take bulging and material hardening into consideration is overcome, and complex data processing caused by using a rating curve method is avoided.

The invention discloses a data processing method based on a separated Hopkinson press bar experiment technique. The method includes the steps: return-to-zero adjustment: performing a wavelike return-to-zero adjustment on a voltage-time curve acquired by a data acquisition unit, and namely, enabling an initial voltage value to keep zero; data smoothing: smoothing the voltage-time curve, and removing abnormal points; waveform selection: selecting head and tail positions of incident waves, reflected waves and transmitted wave, and intercepting waveforms; result calculation: calculating the intercepted waveforms to obtain engineering stress curve, a true stress-strain curve, a stress-time curve, a strain-time curve and a strain rate time curve; data storage: storing all acquired waveforms anddata. The data processing method is applicable to testing data for processing dynamic compressive mechanical properties and has high practicability.

The invention relates to variable working condition optimizing operation technologies of power station steam turbines, in particular to a turbine main steam pressure operation curve and an optimization method of the turbine main steam pressure operation curve. The approximate S-shaped main stream pressure operation curve is provided, and an original fixed-sliding-fixed main stream pressure operation mode is replaced. According to a turbine through-flow characteristic and a nozzle block physical structure, the smooth similar-S-shaped curved closer to an ideal optimal pressure operation curve is provided on the basis of the main stream pressure fixed-sliding-fixed operation curve, and the curve mainly comprises a high-load fixed pressure horizontal linear section, a low-load fixed pressure horizontal linear section, a middle-load sliding pressure inclined linear section and arc sections tangential to the sliding pressure inclined linear section, the high-load horizontal linear section and the low-load horizontal linear section. The main stream pressure operation curve similar to the S shape is determined by carrying out data mining on historical operation data, the original fixed-sliding-fixed main stream pressure operation curve is replaced, and unit pressure control is guided.

The invention discloses a method for constructing a mechanical property main curve of a viscoelastic material, which comprises the following steps: 1) performing a mechanical property test on the viscoelastic material to obtain a series of test curves; 2) arranging according to ascending order or descending order of the test temperature and converting all the curve data to logarithm data; 3) calculating shift factors of adjacent curves, when the shift factor is calculated, an area of overlapping areas of two curves is considered, the area of the overlapping areas as zero is taken as a criteria to obtain the shift factor; 4) calculating the shift factor of each curve relative to the assignment reference curve, and shifting the relative curve to construct a main curve; and 5) if the test curve contains peak value curve, performing decomposition on peak value curve, calculating new shift factor, and correcting the constructed main curve. According to the invention, the shift factor can be directly calculated according to test data, and the calculating formula is very simple, the constructed main curve is unique and definite, and the subjective uncertainty of a hand-operated shift mode and necessary fitting or interpolation by a current automatic shift method can be avoided.

The invention discloses a tester for measuring a real stress-strain curve of a plate material under a unidirectional compression state. The lower surface of an upper die seat is attached to the upper surface of an upper puncher pin base; the upper surface of a lower die seat is attached to the lower surface of a lower puncher pin base; an upper insert is fixed on the lower surface of the upper die seat and used for fixedly connecting an upper puncher pin with the upper die seat; the lower puncher pin base is positioned in the center of the upper surface of the lower die seat; a lower insert is opposite to the upper insert; a measurement frame is positioned at the same end of the tester; and a measurement rod of the measurement frame is in sliding fit with the inner hole of an upper strut.A plate material test piece is arranged horizontally, so that the plate material test piece cannot be unstably bent during compression, and large-extent compression deformation is realized; and therefore, the real stress-strain curve of the plate material under a large deformation extent is obtained.

The invention provides a turnout action reference curve selection method and an application thereof. The method comprises the steps of obtaining N action curves of a same turnout through a turnout microcomputer monitoring system, obtaining action time of the N curves, selecting the action time with a highest repetition number in the N action time, and marking the action time with the highest repetition number as Tx; assuming that M curves with action time lengths of Tx exist, and renumbering the M curves; for the M curves, dividing each curve into P equally divided parts according to the action time, and for a current value of a jth moment of the ith curve, obtaining current value matrixes I of the M curves in sequence for all the M curves; for M current values of any moment tj, calculating out a clustering center by utilizing a clustering algorithm, and marking a current value of the clustering center as C(j), wherein C(j) is the current value of the clustering center; and calculatingclustering centers of P moments in sequence, and by analyzing the clustering centers, selecting out a curve with a highest clustering frequency as a reference curve. Based on the reference curve, anabnormal curve diagnosis method is obtained by utilizing a similarity method.

The invention discloses a test and calculation method for determining a true stress-strain curve of a material, which specifically relates to a uniaxial tensile material DIC test and data output, calculation and drawing of the true stress-strain curve, and acquisition of a whole-course true stress-strain curve and local elongation. According to the invention, a detailed technical process is formulated for the uniaxial tensile test, a clear technical requirement that the number of grids arranged in the width direction of the test piece is twice of the width is provided, an integer scale distance of 1.0 mm is ensured to be taken in the physical sense, the technical target of obtaining the whole-course true stress-strain curve and the local elongation of the material is achieved, cognitive obstacles, technical obstacles and effect obstacles in actual engineering application are swept away, and a road is laid for large-scale engineering application of the material, so that the method has important theoretical and engineering practice significance.

The invention provides a Pico-satellite solar cell simulator and a simulation method. The solar cell simulator comprises a computer, a plurality of daughter boards, a mother board and a computer data interface. The invention also provides a simulation method of a Pico-satellite solar cell, which comprises the following steps: firstly, acquiring a plurality of solar cell array characteristic curve parameters and an effective irradiation coefficient; secondly, multiplying the solar cell array characteristic curve by the effective irradiation coefficient to obtain a curve which is actually output by the solar cell; thirdly, calculating the current load impedance by utilizing an output current and an output voltage which are sampled at both sides of a load to obtain a voltage / current relational graph of both ends of the load, and intersecting the voltage / current relational graph with the curve which is actually output by the solar cell, wherein the current value corresponding to the intersection point is the current value which is output actually; and finally, outputting the current value which is output actually to the load to realize the real-time simulation of the current value. The invention has the advantages of simple hardware structure, can conveniently simulate current outputs in multiple surfaces at the same time, and can simulate the outputs of the solar cell under different irradiation conditions according to the actual rating curve.

There is provided a technique for automatically determining or predicting a line range specific to a sample that appears in a reaction curve in an automated analyzer for mixing a specimen and a reagent and measuring a change in a mixture of the specimen and the reagent with time. This invention approximates reaction curve data by a function and automatically determines a curve part at an early stage or a second stage of a reaction. The invention determines a line range not including a curve part for each sample and calculates a laboratory test value using absorbance data within the determined line range. This invention also automatically determines a start time of line at the early stage of the reaction on the basis of absorbance data obtained up to a point halfway through the reaction curve, predicts a line range on the basis of the end time of line and a planned end time of line, and calculates a predictive value on the basis of a result of the prediction.

The invention discloses a measuring method and system for elasticity modulus of a polymer. The method comprises the steps that a load-displacement curve is acquired; the load-displacement curve is a change curve of load applied to a probe of an atomic force microscope with displacement of a piezoelectric ceramics scanning pipe when the atomic force microscope is used for conducting a nanoindentation experiment on a polymer sample; the load-displacement curve is converted into a force curve; the force curve comprises a loading curve and an unloading curve; a first turning point of the loading curve is determined; data points behind the first turning point of the loading curve are deleted, and data points before the first turning point of the loading curve are reserved; the data points before the first turning point are subjected to fitting through a hertz model to obtain fitting data; according to the fitting data and a hertz model calculating formula, the elasticity modulus of the polymer sample is calculated. According to the method, the fitting range can be definitely selected, therefore the Hertz model can be conveniently and accurately utilized for conducting fitting on the loading curve, and the obtained elasticity modulus of the polymer can be more accurate after calculation.

The invention relates to a special protein testing method and a special protein testing device. The testing method includes the steps: adding reagents into special protein and mixing the reagents and the special protein into reaction liquid; acquiring the scattered light value of the reaction liquid and forming a reaction curve according to the relation between the scattered light value and time; linearly fitting the reaction curve to obtain inflection point values of the reaction curve; obtaining calibration coefficients by a five-point calibration method corresponding to the inflection point values of the reaction curve; and computing the concentration of the special protein according to the relation among the obtained calibration coefficients, the preset scattered light value and the concentration of the special protein. By the aid of the special protein testing method and the special protein testing device, the concentration of the special protein can be rapidly tested, testing efficiency is improved, smoothness of the curve is enhanced by linearly fitting the reaction curve, and measuring results are accurate and stable.

The invention discloses a spherical screen device and an image generating method thereof. An image is corrected by following steps: according to a corresponding radian curve with the radian at 90 degrees, uniformly dividing the radian curve of a spherical screen into multiple sections; according to a pixel of a plane image needing to be displayed, similarly dividing a straight line, corresponding to the radian curve, of the plane image into multiple sections identical to the sections of the radian curve in number; valuing an image parameter of the first point in the plane image to a third point in the plane image; on the radian curve, linking the second point, corresponding to the first point, of the position of the image to be displayed with the center of a sphere, and taking the point located in a plane of the plane image as the third point. By adopting image correction, image restoration on the spherical screen is realized, and the spherical screen device and the image generating method thereof are particularly applicable to image displaying realization on LED spherical screen devices at 360 degrees.

The invention provides a variable air volume air conditioning system total air volume control method based on an operation curve. The control method comprises the following steps that S1, a resistancecharacteristic curve a of a pipeline system is obtained, the mathematical expression of the resistance characteristic curve a is P=Sa.Q<2>, wherein P represents the pipeline resistance, the unit of the pipeline resistance is Pa, Sa represents a pipeline resistance coefficient, Q represents the air volume, and the unit of the air volume is m<3> / h; S2, characteristic curves of a fan at various rotating speeds are obtained, the characteristic curves comprise a P-Q curve and an Ng'-Q curve, wherein P represents the fan pressure head, the unit of the fan pressure head is Pa, Q represents the air volume, the unit of the air volume is m<3> / h, Ng' represents input powers of the fan at various rotating speeds, and the unit of the input powers is kW; S3, the operation curve c of the fan is solved;S4, an Ng'-f curve is determined, wherein f represents the operation frequency of the fan, and the unit of the operation frequency is Hz; and S5, the total air volume adjustment control is carried outaccording to the operation curve c of the fan. The method is simpler than static pressure control in control form, belongs to partial feed-forward control, and is relatively rapid and stable in adjustment.

The invention discloses a multi-station linkage rating curve fitting method, and the method comprises the steps: selecting a test station; determining a flood forecast period l of the test station; constructing a rating curve (shown in the description) of the test station, wherein t is a sampling moment, N is the number of actual measurement stations of the upstream side of the test station, i isthe serial number of the actual measurement stations of the upstream side of the test station, Z<t+l>, Q<t+l> and a<t+l> are respectively are a water level predicted value, a flow predicted value anda flow coefficient of the test station in the forecast period, a<i, t>, Q<i, t>, Ab<i, t> and Z<i, t> are respectively a flow coefficient, a flow value, a water level coefficient and a water level value of the i-th actual measurement station at a moment t, c is an offset of the flow of the test station relative to the water level in the forecast period, Epsilon is a remainder term and approaches to an infinitesimal value, and l is nit greater than the time lag of a flood wave from the upstream side to a downstream side. According to the invention, the real-time stage-discharge relation of thetest station is represented as a function of the water level of the upstream station and the flow at a historical moment, and the method can obtain the more precise result in the real-time flood forecast applications in different forecast periods, and provides a real-time flood forecast level and the forecast precision.

The invention relates to a method for fertilizing optimal phosphorus amount in a dry land, making sure to meet double requirements of environment and production, namely, the optimal available phosphorus content in soil is finally fixed by a rating curve of the available phosphorus in the soil and CaCl2-p and a turning point of the rating curve of the available phosphorus in the soil and crop production. Then the content of the available phosphorus in the soil which is not fertilized is measured to calculate the difference value with the optimal available phosphorus content, the corresponding fertilizing amount is obtained according to a graph of relation of the fertilizing amount in the soil and the available phosphorus increment in the soil, thus determining the optimal fertilizing amount. The measuring method of the invention can save fertilizer, lower production cost and reduce environmental risk.

The invention discloses an acoustic emission energy calculation method based on a complete stress-strain curve of loaded coal and rock. The method comprises the following steps: step (1), deformation energy Uepsilon is calculated according to the complete stress-strain curve of the loaded coal and rock; step (2), a curve of the deformation energy Uepsilon is traversed, previous and later Uepsilon values are compared every certain time period T, and T is a test sampling interval; step (3) when compared Uepsilon values drop, one acoustic emission event is recorded, and acoustic emission information is recorded. The method has the advantages that the calculation method is definite in physical meaning and high in operability, and calculating parameters and distinguishing steps involved in the method are all applicable to programming realization; the method not only can effectively acquire acoustic emission parameters in a post-peak failure stage of a uniaxial test and in a whole stage of a true triaxial test, but also can further reveal mechanical essence of production of acoustic emission phenomena, and provides one acoustic emission analysis way for schools and research units without acoustic emission testing conditions.

The invention provides a feedforward feedback simulation method for a TRT blast furnace top pressure control stamping process. Through establishing a feedforward feedback simulation system and utilizing a simulation method for the blast furnace stamping process, the rating curve of a stationary guide blade is utilized in advance for feedforward control of the opening degree of the stationary guide blade during stamping, the set value of the top pressure and the feedback value are compared, a controlled variable is output for feedback control of the stationary guide blade, and commissioning in the simulation system can ensure a more reasonable control scheme, so that the influence of direct online testing of different control schemes on the normal operation of the blast furnace can be avoided.

A device (D) for adapting a nominal curve for torque transmitted by a clutch (EM) with respect to a position of an actuator of the clutch (EM) is designed to i) define a readjusted nominal position equal to a nominal position minus a reference position from the nominal curve, (ii) determine, for at least one chosen readjusted nominal position, a difference between an observed torque and an estimated and corrected transmissible torque that is a function of a correction coefficient and of an estimated transmissible torque, a function of the value of a conversion coefficient and of first and second nominal extreme curves, and (iii) determine for each chosen readjusted nominal position, in a readjusted nominal curve, a corresponding nominal torque so that it can be adapted according to the corresponding determined torque difference in order to obtain an adapted nominal torque, and to adapt the readjusted nominal evolution curve as a function of each adapted nominal torque in order to obtain an adapted nominal evolution curve.

A monitor with ratings survey capability is provided, including a monitor, characterized in that the monitor is equipped with a data collecting means and the data collecting means is connected to a signal resource for collecting viewing history of the monitor during a period from monitor start-up to monitor shut-down. The data collecting means can transmit the collected viewing history back so that the monitor is provided with a function of ratings survey for the convenience of ratings survey of various programs, time slot ratings survey, or recording viewing habit of the family.

The invention discloses an automatic early warning device and method of coal mining machine transient detection. The method comprises the steps that a Roche coil is wound on a cutting motor power line; when current flows through the power line, the current sensed by the Roche coil is acquired by a current integrator; a vibration sensor is placed in an electric cabinet of a coal mining machine, andwhen the coal mining machine works, generated mechanical motion acceleration is induced by an acceleration sensor arranged inside and is then reflected as the vibration amount; signals of two currentsensors and the vibration sensor are acquired in real time, a special algorithm combining a current curve and a vibration curve is adopted, the working state of a cutting head of the coal mining machine is comprehensively judged, and the effect of the cutting head of the coal mining machine is protected timely. The automatic early warning device and method have the advantages that the design of acontrol processor with a field programmable door array (FPGA) being the core is adopted by a main control unit, and a related control time sequence, current data, vibration data, data communication and calculation are parallelly treated at high speed to guarantee the accuracy, the stability and the timeliness of synchronous detection data.

The present invention relates to a method for measuring the surface temperature of the tepid board of the sensor based on the intensity of the electromagnetic wave. First, Si radicel sample piece and the tepid board are produced; then, the intensity of the electromagnetic wave with a certain wave length under a certain solid angle of the surface of the Si radicel sample piece and the temperature of the surface of the Si radicel sample piece are measured to obtain the rating curve showing the relation between the intensity of the electromagnetic wave and the surface temperature; the tepid board obtained by cutting the Si radicel sample piece is positioned in a heat and light preventing environment to measure the intensity of the electromagnetic waves having the same wavelength under the same solid angles on the surface of the tepid board, thus, the temperature of the measured area of the surface of the tepid board can be obtained by contrasting the rating curve showing the relation between the intensity of the electromagnetic wave and the surface temperature. The micro-areas having different sizes can be measured by selecting the probe heads with different diameters of the electromagnetic wave detecting instrument, and the measuring of the surface of the tepid board can be performed point by point to obtain the distribution of the temperature of the surface of the tepid board. Thus, an un-contact measuring of the surface of the tepid board can be performed.

The invention belongs to the field of complete characteristics of a main circulating pump of reactor coolant in a nuclear island of a nuclear power plant, and relates to a method for constructing a mapping curve based on a large number of experiment data, mathematical statistics and pump similarity theories. So far, the curves used in the field mainly comprise characteristic curves, zero dimension curves and equal-lift and equal-torque curves which can not comprehensively meet the requirements for analyzing the performance of the nuclear main pump and can not be conveniently programmed on a computer. The mapping analyzing liquid phase operation performance of the nuclear main pump can well solve the problems. The curve has the advantages of being concise and vivid, and convenient to use, and especially the performance of the nuclear main pump can be conveniently analyzed through computer programming. Due to the fact that the mapping curves are kept closed and continuous in a coordinate system, program compiling is simplified to a large extent.

The invention discloses an action intelligent comparison method which is used for intelligently judging the similarity between technical actions and standard actions in table tennis. The method comprises the following steps: data preprocessing: determining a reference coordinate and calculating an angle of a joint point; human body coordinate transformation, wherein the human body coordinate transformation comprises coordinate translation and a rectangular coordinate system rotating sphere coordinate system; action splitting: during action data capture, splitting one action into a plurality ofaction templates to respectively identify and record the action templates as joint point 3D position data at different action stages; and, when an action curve is drawn, finding a segmentation pointthrough an algorithm, and splitting the segmentation point into a plurality of segments of data; calculating motion deviation, wherein the calculation of the motion deviation comprises calculation ofmotion track local deviation and calculation of motion track overall deviation. According to the method, the similarity of the postures is measured based on the 3D position information of the joints,the human body posture error is prevented from being measured through the joint angles, and the calculated amount is small.

The invention provides a feedforward control simulation method for a TRT blast furnace top pressure control material distribution process and a system therefore. Blast furnace material distribution is a disturbance that can be known in advance, so that the opening degree of a stationary guide blade can be controlled in advance through the analysis of the material distribution process to eliminate the influence of material distribution on the blast furnace top pressure. During material distribution, the porosity of a material surface is reduced when a furnace material reaches the material surface, so that the air permeability of the material surface is decreased, and coal gas flow resistance is increased. Therefore, the flow of coal gas reaching the furnace top is reduced, and a plunge in the furnace top pressure occurs if the opening degree of the stationary guide blade is unchanged. Feedforward control includes the parallel steps of calculating the decrease in coal gas flow according to furnace material type, the timing, gear and interval of material distribution and the like and calculating the opening degree of the stationary guide blade corresponding to the decrease in coal gas according to the rating curve of the stationary guide blade. The curve is utilized to control the opening degree of the stationary guide blade in advance during material distribution, so that the influence of material distribution on the furnace top pressure can be eliminated.

The invention relates to the technical field of water conservancy experiments, and provides an automatic sand adding device for a tidal estuary sediment physical model. The tidal estuary sediment physical model comprises a model riverway, and a model estuary is arranged on the downstream portion of the model riverway. The automatic sand adding device comprises a clear water pond, a sand supply pond and a terminal device. The clear water pond and the sand supply pond are each provided with an output pipeline. A sand adding pipe is arranged at the tail end formed after the output pipelines are gathered. The clear water pond and the sand supply pond are each provided with a flow control structure. An online turbidimeter is arranged on an outlet of the sand adding pipe. The online turbidimeter and the flow control structures are all controlled by the terminal device. The automatic sand adding device monitors the sand content in the model riverway in real time, the sand content of incoming running water is removed from the rating curve sand adding amount, the sand adding mount is made to meet experiment requirements, and experiment precision is improved. When sand does not need to be added, the terminal device controls the water to flow out of a sand adding hole of the sand adding pipe continuously, and the function of preventing the sand adding pipe from being blocked can be achieved.

The invention discloses a method for calculating puncture distance of self-elevating platform. The method comprises the following steps: firstly, assuming a series of puncture distances, solving support forces required to be provided when puncture pile boots corresponding to the puncture distances are in static balance, generating a relation curve of the support forces and the puncture distances, and defining the relation curve as a curve A; further generating an integral curve of the curve A corresponding to the puncture distance, and defining the integral curve as a curve B; solving the soil instrumentation resistance corresponding to each puncture distance, generating a relation curve of the soil instrumentation resistance and the puncture distance, and defining the relation curve as a curve C; further generating an integral curve of the puncture distance corresponding to the curve C, and defining the integral curve as a curve D; and the puncture distance at the intersection of the curve B and the curve D is the final puncture distance of the pile shoe. The defects that the puncture process is considered as a static process and platform structure parameters are considered in existing puncture distance analysis are overcome, and a more accurate analysis and calculation method is provided.

Disclosed herein are methods for determining the presence of a coagulation inhibitor in a patient. A patient curve associated with the patient sample and having a patient slope (Ps) and a a standard curve associated with a control sample and having a control slope (Cs) are generated, and the Ps and the Cs are compared to obtain a Ps / Cs parallelism ratio. A Ps / Cs parallelism ratio of less than a predetermined ratio is indicative of presence of a coagulation inhibitor in the patient sample.