495 results about "Sensitivity coefficient" patented technology

The invention belongs to welded structural steel with high strength and low yield ratio and a production method thereof, aiming at solving the defects that a steel plate or a steel coil with the specification smaller than 25mm can only be produced, the process is long, and the like. The invention adopts the measures that the welded structural steel contains chemical components by weight that: 0.04-0.10 percent of C, 0.60-2.00 percent of Si, 1.50-2.50 percent of Mn, less than or equal to 0.030 percent of P, less than or equal to 0.010 percent of S, 0.20-0.50 percent of Cu, 0.40-0.80 percent of Cr, 0.35-0.80 percent of Ni, 0.0008-0.0030 percent of B, and at least three of the following components: less than or equal to 0.60 percent of Mo, 0.015-0.060 percent of Nb, 0.030-0.120 percent of V, less than or equal to 0.030 percent of Ti, less than or equal to 0.040 percent of Als and less than or equal to 0.010 percent of Zr, and the rest is Fe and unavoidable impurities; and meanwhile, Mn and Cr also need to satisfy the condition that Mn and Cr are equal to 2.20-2.80 percent, and the welding cold crack sensitivity coefficient Pcm is equal to C plus Si/30 plus (Mn plus Cu plus Cr)/20 plus Mo/15 plus Ni/60 plus V/10 plus 5B and is less than or equal to 0.30 percent; the production method comprises the following steps of heating a steel billet, rough rolling, finishing rolling, relaxing and laminar cooling, and the laminar cooling comprises the following steps of slow cooling, quick cooling and natural cooling to room temperature.

The invention discloses a triaxial MEMS gyroscope rotation integral calibration method based on a uniaxial turntable. According to the invention, first, a triaxial MEMS gyroscope error model is established; the triaxial MEMS gyroscope is fixed on the uniaxial turntable; MEMS gyroscope six-position rotary calibration is carried out; test data and sampling time of 12 times of rotation of the MEMS gyroscope at the 6 positions are tested and recorded; through the 12 times of rotation of the MEMS gyroscope at the 6 positions, a MEMS gyroscope error model is simplified, and an error model after gyroscope rotation is obtained; integral calculations are carried out upon two sides of the equation of the error model after gyroscope rotation, an error equation set is established, and MEMS gyroscope error coefficient is obtained by calculation. With the method provided by the invention, calibration precision is ensured; and fixed zero bias, scale factor, cross-coupling error coefficient, and acceleration sensitivity coefficient of the MEMS gyroscope can be solved rapidly, such that calibration efficiency is improved.

The invention relates to an assessment method for transient voltage stabilization of a load area of an electrical power system and belongs to the electrical power system stability analyzing and assessment field. The assessment method for the transient voltage stabilization of the load area of the electrical power system includes that using data measured by a synchronous phasor measurement unit as basis, and building an initial sample database for data mining through a lot of simulation samples; extracting characteristics for reflecting the stabilization degree of each node through the quantitative evaluation for each node in the area; identifying through a multiple linear regression method to obtain sensitivity coefficients for reflecting the mutual influence relations between the nodes in a local area network; using a semi-supervised clustering method to demarcate all the samples; using a decision tree algorithm to perform classified learning to obtain a decision tree model, and using the decision tree model for online monitoring to assess the global transient voltage stabilization state of the load area of the electrical power system.

The invention provides a method for acquiring a sensitivity coefficient of an important parameter of reactor physical grid computation. The method comprises: 1, establishing a computing model for a specific reactor physical computing problem; 2, adopting a subgroup resonance self-shielding method to perform resonance self-shielding computation, establishing a corresponding generalized conjugate equation for a fast group source term, a resonance energy group source term and a resonance self-shielding section, and solving the generalized conjugate equation to obtain a sensitivity coefficient of a resonance self-shielding section; 3, for an important parameter that needs to be computed, establishing and solving the generalized conjugate equation corresponding to the important parameter, so as to obtain an explicit sensitivity coefficient of the parameter; and 4, combining the sensitivity coefficient of the resonance self-shielding section and the explicit sensitivity coefficient of the resonance self-shielding section to obtain an implicit sensitivity coefficient, wherein a total sensitivity coefficient is equal to the sum of the explicit sensitivity coefficient and the implicit sensitivity coefficient. According to the method provided by the invention, the sensitivity coefficient of any parameter that can be represented as a flux or conjugate flux functional can be obtained quickly; an implicit effect is also considered; and thus the sensitivity coefficient is more accurate.

An abnormality determination device of a cylinder pressure sensor calculates a gain (sensing sensitivity coefficient) and an offset (bias) indicating an output characteristic of the cylinder pressure sensor. The device determines existence or nonexistence of an abnormality in the gain and the offset respectively. When the device determines that the abnormality exists, the device performs failsafe processing set in modes different from each other between the case of the abnormality in the gain and the case of the abnormality in the offset. As the failsafe processing in the case of the abnormality in the gain, the device performs processing for substantially prohibiting usage of a sensor value of the cylinder pressure sensor in control (fuel injection timing control) by using an alternative value (specified value) instead of the sensor value of the cylinder pressure sensor.

The invention discloses a clustering and deep belief network-based leakage initial locating method. The method comprises the steps of firstly performing calculation to obtain a pipe network monitoringpoint sensitivity coefficient matrix; secondly dividing a pipe network into multiple leakage regions based on K-means clustering, and generating a leakage sample by utilizing hydraulic simulation software; thirdly building and training a deep belief network-based leakage region identification model; and finally identifying the leakage regions according to actually measured pressure data. The method solves the problem of leakage sample scarcity during modeling, realizes quick locating of the leakage regions in an initial leakage stage, and has relatively high identification precision and relatively strong operability.

The invention provides a high temperature strain foil performance parameter tester and a test method thereof. The high temperature strain foil performance parameter tester is composed of a heating system, a heat preservation system, a temperature control system, a circulation system, a support system and a loading system. The tester and the test method of the invention can test technical parameters of the high temperature strain foil such as null shift, thermal output, thermal delay, mechanical delay, change of sensitivity coefficient with temperature, creep deformation of the high temperature strain foil, creep deformation of constant strength calibration beams made of measured target material and the like. The tester and the test method of the invention feature high test precision, good high temperature repeatability and reliable test results, thus providing data correction for long-term high temperature strain monitoring.

The invention belongs to the technical field of low alloy steels and production processes thereof, and particularly relates to a high-property super-thick steel plate for a 500 MPa-level engineering structure and a manufacturing method thereof. The high-property super-thick steel plate comprises the following components in percentage by weight: 0.020%-0.070% of C, 0.30%-0.60% of Si, 1.35%-1.60% of Mn, 0.010%-0.020% of P, S<=0.005%, 0.030%-0.060% of Nb, 0.010%-0.030% of Ti, 0.020%-0.050% of Als, 0.35%-0.45% of Cu, 0.20%-0.40% of Cr, 0.30%-0.60% of Ni, 0.05%-0.10% of Mo and the balance of Fe and inevitable impurities. In addition, the high-property super-thick steel plate disclosed by the invention meets the requirements that the welding cold cracking sensitivity coefficient Pcm is less than or equal to 0.20% and the ASTMG101-01 corrosion-resistant index I is more than 6.0. The manufacturing method disclosed by the invention adopts the low-C Cu-Ni-Cr-Mo-Nb-Ti component system, prevents the grain in an HAZ (Welding Heat Affected Zone) from being growingn because a grain refining effect achieved by compositely adding Nb-Ti is higher than the grain refining effect achieved by independently using V, enhances the obdurability of a steel plate base body and HAZ and is contributivee to enhancinge the welding line energy.

The invention provides a gas protection welding wire rod and a welding wire thereof. Both the wire rod and the welding wire comprises the following elements (according to the weight percent): C is 0.03 to 0.12, Si is 0.30 to 0.80, Mn is 1.2 to 2.2, S is equal to or less than 0.015, P is equal to or less than 0.020, Ni is 0.4 to 1.0, Cr is 0.1 to 0.5, Mo is 0.2 to 0.6, Ti is 0.06 to 0.2, and the rest is Fe and inevitable impurity elements. The welding wire provided by the invention has the advantages of simple chemical element design, small content of the precious alloy elements and low crack sensitivity coefficient, and the deposited metal has the advantages of high intensity, excellent crack resistance and low-temperature shock toughness and excellent dynamic performance. The welding wire of the invention is suitable for the welding of low alloy structure steel with 600 to 800MPa tensile strength, which is applicable to engineering mechanics, heavy trucks, hydraulic power, coal power and other industries.

The invention discloses a large thickness steel plate for hydrogenation reaction chamber reeling equipment and a production method thereof. The steel plate takes Cr-Mo steel as the base, an amount of alloying elements, such as Ni, Cu, Al, Nb, Mn, Cr and the like are added, the contents of harmful elements, such as Sn, Sb, As, P, S and the like are controlled, and the finished large thickness steel is prepared by adopting the processes of electric furnace smelting, LF refining furnace refining, throwing down line stacking for slow-cooling, electroslag remelting, rolling and product forming, diffusion hydrogen annealing, normalizing and tempering heat treatment and the like. The thickness of the steel plate reaches 198 mm, the weight of single steel plate reaches 25 tons, the high temperature tensile strength and yield strength of the steel plate are good, the lower temperature toughness at minus 30 DEG C is good, the steel plate has good tempering embrittlement sensitivity coefficient, and the purity of the produced steel plate is high, the component is uniform, the inner part is compact, and the mechanical property is uniform. The steel plate can meet the operation requirement of hydrogenation reaction chamber reeling equipment, and is suitable for the production of the main structural parts of all hydrogenation reaction chamber reeling equipment.

An exposure method for projecting, through a projection optical system, a predetermined pattern formed on a mask onto an object to be exposed. The exposure method includes the steps of dividing an effective light source area for illuminating the mask into plural point light sources, calculating a Zernike sensitivity coefficient that represents a sensitivity of a change of image quality of the predetermined pattern to a change of a Zernike coefficient, when wave front aberration in the projection optical system is developed into a Zernike polynomial for all divided point light sources, determining an effective light source distribution based on a combination of Zernike sensitivity coefficient of all divided point light sources, and forming the effective light source distribution by intensity of each point light source.

The invention relates to a magnetic resonance imaging method comprising the following steps of: correcting and scanning a visual field to obtain a plurality of composite images, summing the absolute values of the plurality of composite images to obtain a summation image, and computing a sensitivity coefficient according to the plurality of composite images and the summation image; and correcting the sensitivity coefficient, and generating a reconstructed image. The magnetic resonance imaging method and device sum the absolute values of the plurality of composite images to obtain the summation image and compute the sensitivity coefficient through the summation image, thereby effectively enhancing the uniformity of the sensitivity coefficient; and after the sensitivity coefficient is corrected, the reconstructed image is generated, thereby effectively eliminating artifacts caused by a motion factor and other factors on the images in the scanning process, enhancing the resolution of the artifact-free composite images generated after reconstruction and reinforcing the robustness of the reconstructed image.

The invention relates to an online calibrating device and a method for a fiber Bragg grating (FBG) strain sensor, belonging to the technical field of metrological testing and calibrating. The device comprises a simulating plate to be tested, a boundary support component, a FBG strain sensor, a first transmission optical cable, a FBG demodulating instrument, an upper computer, a laser lens, a second transmission optical cable, a laser scanner vibration testing and analyzing system, an exciting device and an exciting device connecting line. The calibrating method provided by the invention is convenient and fast and has the characteristics of online calibrating, in-situ calibrating and dynamic calibrating; due to the characteristics, the calibrating method is suitable for engineering application and can provide a dynamic sensitivity coefficient for an attached bare FBG sensor and a packaged FBG stain sensor; and the online calibrating device and the method for the FBG strain sensor provided by the invention can be applied to detecting whether the attaching of the sensor satisfies the requirement or not and can also be used for calibrating the sensitivity coefficient of sensors after the sensors are used for a long time.

The invention discloses a high-strength and high-toughness steel plate for a 630MPa-grade tempered low-temperature spherical tank and a manufacture method thereof. The high-strength and high-toughness steel plate comprises the following components by weight percent: 0.07-0.09% of C, 0.15-0.25% of Si, 1.40-1.50% of Mn, less than or equal to 0.008% of P, less than or equal to 0.001% of S, 0.30-0.40% of Ni, 0.16-0.20% of Mo, 0.015-0.025% of Nb, 0.02-0.06% of V, 0.007-0.015% of Ti, less than or equal to 0.0030% of O, less than or equal to 0.0040% of N, 0.020-0.040% of Al, 0.0005-0.0030% of Ca, and the balance of Fe and unavoidable impurities, wherein the welding cold crack sensitivity coefficient Pcm value is 0.16-0.20% and the hot crack sensitivity coefficient Psr is less than or equal to 0.00%. By adopting the high-strength and high-toughness steel plate, the safety of the spherical tank integral structure is guaranteed, the yield strength of the steel plate is greater than or equal to 510 MPa, the tensile strength is greater than or equal to 630 MPa, the ductility is greater than or equal to 18%, the Charpy notch ballistic work average value in the plate thickness 1/4 part at -50 DEG C is greater than or equal to 2000 J, the single value is greater than or equal to 150 J, the Charpy notch ballistic work average value in the plate thickness 1/2 part at -50 DEG C is greater than or equal to 150 J, the single value is greater than or equal to 100 J, and the steel plate nil ductility transition temperature (NDTT) is less than or equal to -50 DEG C.

The invention provides a low thermal effect projection objective. The projection objective consists of lenses with different low thermal effect sensitivity coefficients KLT/LH, and the lens with higher KLT/LH consists of materials with smaller thermal effect property, wherein the thermal effect sensitivity coefficient KLT/LH is equal to (D/) (/CA); D expresses the thickness of a single lens; CA expresses the effective light pass caliber of each lens; expresses average center thickness of N lenses; and expresses average light pass caliber of the N lenses. The lens selects the material with small thermal effect property according to the thermal effect sensitivity coefficient of the lens, and the adverse effect of the thermal effect on a projection optical system is reduced.

The invention provides a distributed power generation planning method and belongs to the technical field of power energy saving. The method is mainly used for coordinating relation between power grid planning and distributed power supply configuration. The method includes first introducing a node sensitivity coefficient array and a unit loading increment cost array, building a power grid node/ branch margin capacity cost model and a calculation method thereof, quantizing effect of the distributed power supply grid tying on the power grid node/ branch margin capacity cost and finally conducting benefit calculation and evaluation on two distributed power supply property right models owned by a user and a power grid company based on a quantization model of effect of the distributed power supply grid tying to the power grid node/ branch limit capacity cost.

The invention provides a fiber grating cable tension transducer with a temperature self-compensation function, belonging to the field of transducer technologies. The transducer provided by the invention is characterized by comprising a metal baseplate, a clamping piece, a micro fiber grating strain transducer and a cable component of fiber transmission. The measuring sensitivity of the transducer can be adjusted by changing sizes of elements of the transducer in accordance with actual requirements, thus being suitable for monitoring cable tension of the different cables in real time. The fiber grating cable tension transducer can measure the cable tension of the cables indirectly by measuring an anchor head structure and utilize the properties of the fiber grating to improve the cable tension sensitivity coefficients of the transducer, and is not influenced by structural materials and external environments. The fiber grating cable tension transducer can eliminate influences of eccentric forces on measuring values, realize the temperature self-compensation and overcome the defects that a traditional electric transducer is subjected to electromagnetic interference easily and is poor in long-term stability, and has the advantages of high accuracy, light weight, low influences on the properties of the structure and the like.

The invention relates to a multi-functional graphene flexible sensor having a high resistance strain sensitivity coefficient and high deformation capability and a preparation method thereof. The graphene flexible sensor comprises a flexible substrate, a sensitive material attached onto the surface of the flexible substrate and electrodes distributed at the two ends of the sensitive material. The sensitive material is at least one layer of pleated braided mesh graphene film; the pleated braided mesh graphene film is braided by graphene fibers, preferably, is braided alternately in longitude andlatitude directions; and the graphene fiber internally has a graphene nano-sheet stack structure. The preparation method is simple to operate and low in cost, and have the potential of being widely applied to fields of daily human body motion sensing, health monitoring, an intelligent robot and man-machine interaction and the like.

The invention belongs to the fiber Bragg grating sensor application technology and relates to a mounting method of a fiber grating sensor. The mounting method of the fiber grating sensor obtains a fiber grating sensor adhering process which has ideal strain transmitting effects, good repeatability and high stability by combining analysis results of a strain transmitting theory of a sensor, selecting a variety of adhesives, using different processes for adhering the sensor and verifying the adhering effects through a standard beam test. Further, the fiber grating sensor is adhered by controlling key factors such as the elastic modulus of the adhesives, the adhering length and the adhering layer thickness which affect the strain transmitting rate of the fiber grating sensor, so that the obtained fiber grating sensor has high strain transmitting rates, good repeatability and stable strain sensitivity coefficients, can accurately measure the true strain of monitoring sites and ensures the effectiveness and reliability of the monitoring results.

Disclosed is a method for identifying the topology of an electric power network allows for the automatic and efficient identification of network topology without the knowledge of network parameters. The method is based on the estimation of mutual current sensitivity coefficients and on an algorithm to obtain the network incidence matrix from the estimated sensitivity coefficients. This algorithm is based on the general assumption that the metering unit that is the most sensitive to the variations of the measured current in a branch connected to a particular node is the metering unit that is arranged at the physical node immediately upstream form the particular node. The method effectively considers the presence of noise in the measurements and its time correlation.

The invention provides an optical fiber sensing system temperature compensating method comprising the following steps: 1, temperature calibrating is carried out on an optical sensor to obtain a temperature sensitivity coefficient K[T1]; 2, temperature calibrating is carried out the optical sensor attached in an adhesive mode to the surface of a test piece, of which the materials is same with a to-be-measured piece so as to obtain a material uniform thermal expansion coefficient K[T2]; 3, strain calibrating is carried out on the optical sensor to obtain a strain sensitivity coefficient K [Epsilon]; and 4, in strain and deformation measurement carried out on the to-be-measured piece, strain applied to the to-be-measured piece is measured by an optical fiber strain sensor, and an optical fiber temperature sensor is used to make temperature compensating for the strain sensor; and influences by uniform thermal expansion are rejected to obtain effective deformation strain data. The invention is mainly used for occasions such as strain and deformation caused by fore bearing and non-uniform thermal expansion in optical fiber sensing network measurement, and difficulties in measuring by the optical fiber sensor with regard to deformation and uniform thermal expansion of the measured piece and strain and temperature cross sensitivity are overcome.