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 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 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 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 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 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 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.