57results about How to "Calculation results are accurate and reliable" patented technology

The invention discloses a method for determining the height of an overlying stratum water guiding crack zone. The method includes the steps of 1, according to the thickness, the volume weight, the elastic modulus and the tensile strength of strata overlain on a coal mining working face, judging whether a primary key stratum and/or a secondary key stratum exist/exists in the strata overlain on the coal mining working face or not, and determining the positions/position of the primary key stratum and/or the secondary key stratum; 2, primarily judging the position of the primary key stratum in three overlying stratum zones according to the ratio of rock and loading and the ratio of rock and mining, and primarily determining the range of the height of the overlying stratum water guiding crack zone; 3, calculating the total tensile deformation of the strata overlain on the coal mining working face under three conditions, comparing the total tensile deformation of the strata overlain on the coal mining working face with the ultimate tensile deformation of the strata overlain on the coal mining working face, and judging whether the strata overlain on the coal mining working face are broken or not; 4, determining the height of the overlying stratum water guiding crack zone under three conditions. The steps of the method are simple, the method for determining the height of the overlying stratum water guiding crack zone is simplified, and the accurate result can be obtained.

The invention discloses a three-dimensional seismic fragility analysis method for a bridge structure. The method aims at the condition that a common seismic fragility calculation method cannot be used for carrying out three-dimensional seismic fragility calculation at present. According to the method, damage state equations used for assessing seismic damage of bridge members under a three-dimensional seismic effect is proposed firstly; for calculating damage probabilities of the members, a three-dimensional seismic fragility calculation theory of the bridge structure is detailedly derived and established by applying an engineering structure reliability theory, a probability theory and a mathematical statistics method according to characteristics of the damage state equations; and on the basis of fully considering parameter uncertainty of the bridge structure and uncertainty of seismic oscillation, an incremental dynamic analysis method and a finite element method are introduced. According to the analysis method, a derivation process has a better theoretical basis, and a calculation result is more accurate and reliable; and the method makes a breakthrough progress in the field of fragility research, and one-dimensional seismic fragility analysis is upgraded to three-dimensional seismic fragility analysis in existing research field, so that fragility assessment of the bridge structure under the three-dimensional seismic effect is realized.

The present invention discloses a three-dimensional print slicing method based on a T-spline surface. The method comprises: inputting a to-be-processed T-spline surface, a slice layer thickness and a slice data allowable error; in a T-spline surface parameter field, generating a uniformly distributed parameter grid, and calculating a corresponding Euclidean space grid; according to a model layer thickness, selecting a grid point whose z coordinate is closest to a current layer as a slide initial point at each layer; iterating the slide initial point that exceeds the error along a steepest change direction; by using the slide initial point of each layer as a start point, tracking along an unchanged direction of the z coordinate of the surface, and iterating a slide point that exceeds the error along the steepest change direction, and finally obtaining all slice points that satisfy a precision requirement; and connecting the slice points of each layer, and outputting a slice contour. According to the method provided by the present invention, slicing of the T-spline surface is realized by using a numerical method, and the defects of huge data volume and low precision of traditional three-dimensional printing are solved, so that the method is particularly applicable for three-dimensional print slice processing of models with a complex free surface appearance or internal holes.

The invention discloses a method for determining effective stress coefficients of a rock. The method comprises the steps of preparing a rock test sample and measuring and recording the size of the rock sample; loading the rock sample into a pressure chamber of a triaxial servometer, loading confining pressure to a predetermined value, keeping the confining pressure, constantly loading bias, loading the bias to a set value, unloading, keeping the bias and the confining pressure constant and loading pore water pressure; repeating the previous step and loading the bias until the rock sample is destroyed; drawing a relation curve of bias increments and axial/circumferential strain increment under different confining pressure and carrying out data fitting on the curve to obtain an effective elastic modulus E1 and poisson ratio v31 related to bias grades; and calculating an axial effective stress coefficient and a circumferential effective stress coefficient of the rock sample through a formula. The effective stress coefficients obtained through the method are accurate and reliable, and can be applied to numerical calculation of seepage and stress coupling in practical engineering, the calculation accuracy is greatly improved and the analysis error is reduced.

The invention discloses a device for measuring an elevator motion. The device comprises a camera arranged on an elevator car, and a target arranged in an elevator hoistway, wherein the camera is used for shooting a target image and sending the target image to a processor; and the processor calculates a motion state of an elevator according to the target image. In addition, the invention further provides corresponding method and system for measuring the elevator motion. The device is high in measuring accuracy based on a visual system.

The invention relates to a central air conditioning charging method and charging device. The constant air volume temperature difference type central air conditioning charging method and charging device comprise the following steps: installing temperature sensors on the air inlet and the air outlet separately of every charging unit in the same central air conditioning system, at the same time testing gear state of every user's air conditioning fan by the fan state recognizing device, setting up different gear wind speeds of users' air conditioning fans to different corresponding predetermined values in advance, when the air conditioning fan is operated under a certain gear and the temperature difference of the air inlet and the air outlet reaches the initial value, fetching the predetermined value corresponding to the current gear speed of the air conditioning of user, calculating the computational energy which is consumed by the users' air conditioning fan of the charging unit according to the heat calculation formula under the constant air volume constant state, and sharing the air conditioning fees according to the proportion of the sum of computational energy of every gear of the air conditioning to the total computational energy of central air conditioning system. The measure temperatures are collected on the inlet and the outlet of air conditioning directly, which reflects the using effect better.

The invention discloses a method for designing a tunnel composite lining structure with the load acting on stratum boundaries. By the adoption of the method for designing the tunnel composite lining structure with the load acting on the stratum boundaries, a more reasonable and more economical tunnel lining structure can be designed, a large amount of lining concrete masonry can be saved, the use amount of steel bars can be reduced greatly, and the construction cost of a tunnel is effectively reduced. The method for designing the tunnel composite lining structure with the load acting on the stratum boundaries comprises the steps that basic parameters required by designing are determined; the load of the tunnel is calculated; a design method model is established, surrounding rock is simulated with a two-dimensional solid structure unit, a plane strain model is selected to serve as the design model, the composite lining is supported preliminarily and a beam unit used for secondary lining is simulated according to the elastoplasticity constitutive relation, a chain rod unit for a waterproof layer is simulated, and the chain rod unit is only under the action of pressure; meshing is conducted, wherein the preliminary support and the second lining are divided through mapped meshing; the lower boundary of the surrounding rock is constrained, so that it is guaranteed that rigid body displacement does not occur; the pressure of the surrounding rock acts on the upper boundary, the left boundary and the right boundary respectively; the soil body in the center of the tunnel is excavated for calculation, and the internal force and deformation during preliminary support and second lining are extracted respectively; the reasonable lining thickness and the reasonable reinforcement ratio are designed according to an internal force deformation result during preliminary support and second lining.

The invention discloses an experimental device based on a threshold value of an atmospheric parameter optimization space laser communication system. The experimental device comprises a sending terminal and a receiving terminal; a modulation signal source of the sending terminal outputs a coded signal to control a semiconductor laser to send a Gaussian laser beam; the Gaussian laser beam is fixed on a beam expander arranged on an optical bench through optical fiber input and enters atmospheric turbulence after collimation and beam expanding, is received by a Cassegrain telescope at the receiving terminal after being transmitted for a distance in the atmospheric turbulence, and enters coupled optical fibers of a photoelectric detector after focusing; and a voltage signal output by the photoelectric detector is transmitted to a computer, and the computer processes collected data according to a calculation program and outputs the optimal fixed threshold value UST and bit error ration (BER) of the space laser communication system under the current condition. The device has no special requirements for optical elements, and is simple in structure, convenient to operate and good in optimization effect; and simultaneously, the calculation method for determining the threshold value is good in optimization effect and simple to implement.

The invention relates to an implementation method of a collapse early-warning system under a large-space roof fire, which comprises the following steps that: a detection part is arranged on a roof corresponding to a roof structure grid to be detected to obtain near-roof dynamic temperature and dynamic space coordinates of a detected point position, and transmits data to the outside in a wireless and acoustic emission mode; visual early warning is sent out instantly in a light display mode; the disposal part is arranged in a ground safety area around a fire building, receives dynamic temperature data and dynamic space coordinate data, sent by all the detection parts, of the detection point positions close to the roof in a wireless harmony recognition mode, and carries out calculation in combination with manually-input building and roof structure information data. Sound early warning and wireless early warning are sent to related personnel according to different early warning levels; compared with the prior art, the system is used for predicting and early warning the whole collapse process of the area and the whole body, seriously affected by the fire, of the roof from the two perspectives of critical temperature and bearing capacity for the large-space roof, the number of erected instruments is small, and huge public safety benefits are achieved.

The invention provides a low-permeability oil reservoir two-dimensional CO2 immiscible displacement mathematical simulation method. The low-permeability oil reservoir two-dimensional CO2 immiscible displacement mathematical simulation method comprises the steps that a low-permeability oil reservoir two-dimensional CO2 immiscible displacement mathematical model is established; parameters and boundary conditions required in the low-permeability oil reservoir two-dimensional CO2 immiscible displacement solving process are processed; the low-permeability oil reservoir two-dimensional CO2 immiscible displacement mathematical model is solved, and the mathematical model is solved through a numerical method, that is, solving is conducted through an implicit pressure explicit saturation method; and a low-permeability oil reservoir is selected, geological parameters of the low-permeability oil reservoir are obtained, calculating is conducted through the low-permeability oil reservoir two-dimensional CO2 immiscible displacement mathematical simulation method, and results are analyzed. According to the low-permeability oil reservoir two-dimensional CO2 immiscible displacement mathematical simulation method, the change of crude oil viscosity and the change of the fluid start pressure gradient are considered in the CO2 immiscible displacement process, the low-permeability oil reservoir CO2 immiscible displacement mathematical model is established, the model is more similar to the actual properties of the oil reservoir, the solving method and the result analysis method are given, the calculation results are more reliable, and the low-permeability oil reservoir two-dimensional CO2 immiscible displacement mathematical simulation method is used for guiding development of low-permeability oil reservoir CO2 immiscible displacement.

The invention discloses a respiratory frequency detection method including the steps: acquiring a distance change signal of at least one mark position in a human chest in a preset acquisition period;carrying out normalizing treatment of the distance change signal to obtain normalized data; filtering the normalized data to obtain a first respiratory signal; and carrying out wavelet transform of the first respiratory signal to obtain a second respiratory signal, and determining the respiratory frequency according to the second respiratory signal. By recording the fluctuation change of a specific area of the human chest, the distance change signal is transformed into the respiratory signal, and the respiratory frequency is obtained by processing the original signal with combination of normalization, filtering and wavelet transform technologies. The method has the advantages of high signal acquisition real-time capability, accurate and reliable calculation results and simple detection operation.

The invention discloses a breast cancer 21 gene detection kit and a detection method thereof. The kit comprises primers and probes for detecting genes ACTB, GAPDH, RPLPO, GUS, TFRC, CD68, BAG1, GSTM1,HER2, GRB7, MMP11, CTSL2, KI67, STK15, CCNB1, MYBL2, Survivin, ESR1, PGR, BCL2 and SCUBE2. Two pairs of primers and two specific probes are respectively designed for 21 genes in the kit, a primer andprobe liquid of each gene is placed in one reaction tube, a same buffer solution and a procedure are adopted for QPCR (Quantitative Polymerase Chain Reaction) amplification, the operation is simple and convenient to carry out, the detection time can be shortened, and clear and accurate results can be achieved; the kit is wide in application, and applicable to both scientific research and clinicaldetection and applicable to single or multiple samples, and rapid and accurate detection results can be achieved.

An improved availability evaluation method for a nuclear power design phase comprises S1, screening out a system in which a fault may cause the reactor tripping and the turbine tripping of a unit; S2,performing FMEA analysis on the equipment in the system screened out in the step S1 to determine all single and dual failure modes that cause the reactor tripping and the turbine tripping of the unit; S3, taking an event that the system is unavailable and causes the unit to stop and reduce the power as a top event, and for each failure mode, determining the minimum cut set by fault tree modeling;S4, determining a failure rate and a mandatory unavailable time of each minimum cut set; S5, calculating an annual unplanned shutdown frequency of a nuclear power plant by using the failure rate of each minimum cut set and the annual number of times/annular time of the fault; and calculating the annual mandatory unavailable time of the nuclear power plant based on the failure rate and the mandatory unavailable time of each minimum cut set; and S6, determining the availability of the nuclear power plant based on the annual unplanned shutdown frequency and the annual mandatory unavailable time.The method can quantitatively predict the availability of the nuclear power plant.

The invention relates to a wind turbine rotor aerodynamic performance evaluation method based on a three-factor fitting integration method. The method adopts a fitting mode to calculate the corresponding non-dimensional coefficients of the axial thrust, the torque and the power, and considers that the integrand function which is not considered in the traditional calculation method is discontinuousand can not be integrated strictly, and the parameters of each blade surface are different from each other and the deviation of the performance result calculated directly by the integration form is large. Compared with the traditional calculation model of wind turbine performance, the method is more scientific and accurate, and the processed result is more reliable.

The invention discloses a coal-fired power plant carbon emission index real-time monitoring system and method. The system comprises a primary fan inlet data real-time collecting system, an air feeder inlet data real-time collecting system, an air component data real-time collecting system, a flue gas component data real-time collecting system and a carbon emission real-time calculation analysis and display system. The primary fan inlet data real-time collecting system, the air feeder inlet data real-time collecting system, the air component data real-time collecting system and the flue gas component data real-time collecting system summarize measured data to an collecting and uploading device, and the data is processed by a filtering module and then transmitted to an collecting database server according to an MODBUS communication protocol; and the collecting database server is connected with the carbon emission real-time calculation analysis and display system. The method provides data support for power plant carbon emission management personnel to make decisions.

The invention discloses an oil paper insulation performance analysis method and device considering a non-uniform medium. An existing oiled paper insulation equivalent model cannot accurately reflect the polarization condition of a non-uniform medium interlayer. The invention discloses an oil paper polarization equivalent model considering interlayer polarization. The polarization response processof actual oil-paper insulation can be better reflected, a parameter identification method of an equivalent model is provided based on frequency domain dielectric response actual measurement data of the oil-paper insulation, numerical approximation of an original spectrogram is achieved, and goodness of fit is introduced to serve as an index for evaluating the accuracy of the parameter identification method.

The invention relates to a land-based telemetric localization method of a continuous point source based chemical cloud cluster. End point position coordinates of the continuous point source based chemical cloud cluster are calculated based on angle parameters obtained by fixed-point scanning of two infrared telemetering devices according to a triangular relation formed by maneuvering, then, damage depth of the continuous point source based chemical cloud cluster is calculated, and the application amount and damage boundary of the continuous point source are calculated inversely through combination with the continuous point source diffusion principle. According to the method, the location problem of the cloud cluster by infrared spectra is solved with comprehensive application of principles of a diffusion theory, the novel maneuvering telemetric localization method of the continuous point source based chemical cloud cluster is provided, and technical support is provided for the application of the infrared telemetering devices.

The invention relates to a simulation method for elevating fire truck supporting leg counterforce, which comprises the following steps of: establishing models for all parts of an elevating fire truckby utilizing three-dimensional modeling software, assembling the models, and importing the assembled models into an ADAMS/View environment; boundary condition processing is carried out on the assemblymodel, and constraint creation and load application are included; motion simulation analysis: simulating the working condition of the fire fighting truck, and respectively carrying out static balanceanalysis and dynamic simulation analysis by creating a driving force; and obtaining a counter-force curve of the four supporting legs of the elevating fire truck. According to the method, all parts of the elevating fire truck are created in three-dimensional modeling software for modeling and are imported into ADAMS after being assembled; by creating constraint conditions for adjacent mechanism models and applying load and drive, the landing leg counter-force value is obtained, by adopting the method, the consistency of all structural member models participating in calculation and a real object can be ensured, and a continuous curve of the landing leg counter-force value is obtained through kinematics simulation calculation, so that the result is more accurate and reliable, and the calculation efficiency is high.

The invention belongs to the field of natural gas leakage detection, and relates to a method for determining the optimal installation position of a gas alarm in a kitchen based on CFD. The method specifically comprises the following steps: 1, three-dimensional modeling; 2, defining a boundary and a domain of the model; 3, dividing grids; 4, solving and calculating; 5, post-treatment; and sixthly, a gas alarm is installed. According to the invention, the CFD technology is utilized to simulate the leakage of natural gas in a natural gas stove in a closed kitchen at the maximum rate, and the coordinate point at which the volume fraction of methane reaches the alarm set value of a gas alarm first in the installation area meeting the current industrial standard on the peripheral wall and ceiling is obtained; and the point is the optimal mounting position of the gas alarm in the kitchen. According to the invention, the blank of the current industrial standard of the installation area of the gas alarm is filled, and the alarm time of the gas alarm is shortest when the natural gas is accidentally leaked in the kitchen, so that effective measures can be taken in time to prevent leakage, and the accident risk is greatly reduced.

The invention relates to a lever-type apparatus and method for measuring the demolding performance of concrete. The existing concrete demolding device is complicated in structure, the evaluation method is compilicated in operation, time and manpower are wasted, the expense is high, and the demolding performance of the concrete is difficult to evaluate comprehensively. Concrete and a mold of the concrete are vertically arranged on a base, the middle part of a pressing rod is hinged to the top end of a stand column, the other end of the pressing rod is hinged to one end of a first connecting rodby virtue of a pulling rod, the other end of the first connecting rod is hinged to one end of a second connecting rod by virtue of a force measuring sensor, and the other end of the second connectingrod is separately detachably connected with an upper pressing plate or a lower pressing plate. When in operation, a limiting ball is firstly rotated to make the lower end of the second connecting rodbe separately connected with the upper pressing plate or the lower pressing plate in a threading manner, the pressing rod drives the pulling rod to move upwardly, the pulling rod pulls the upper pressing plate or the lower pressing plate upwardly successively by virtue of the first connecting rod, a force measuring sensor and the second connecting rod until the upper pressing plate or the lower pressing plate and the concrete bonded with the upper pressing plate or the lower pressing plate move relative to each other in a mold. The lever-type apparatus and method are used for measuring the demolding performance of the concrete.

The invention discloses a single-component hydrocarbon fuel energy property prediction method based on a corrected zero potential energy surface, and the method comprises the steps: setting a temperature and pressure range of a single-component hydrocarbon fuel to be calculated and verified, and calculating all internal energy, enthalpy and entropy data of the single-component hydrocarbon fuel in the temperature and pressure range in simulation software; obtaining internal energy, enthalpy and entropy data of experimental measurement of the single-component hydrocarbon fuel within the same temperature and pressure range; determining a working condition of the single-component hydrocarbon fuel at a standard boiling point, and taking a position corresponding to the working condition as a new zero potential energy surface; and correcting the obtained internal energy, enthalpy and entropy data based on the new zero potential energy surface and the internal energy, enthalpy and entropy data measured by the single-component hydrocarbon fuel experiment to be calculated and verified. On the basis of the set temperature and pressure range of the single-component hydrocarbon fuel to be calculated and verified, the temperature and pressure range of the single-component hydrocarbon fuel is expanded, and then energy properties such as internal energy, enthalpy and entropy of the single-component hydrocarbon fuel in the wide temperature and pressure range are predicted.

The invention discloses a single-component hydrocarbon fuel thermophysical property calculation correction method which comprises the following steps: selecting a to-be-analyzed single-component hydrocarbon fuel, and inputting working condition parameters; calculating the potential energy of the to-be-analyzed single-component hydrocarbon fuel molecular system, the heat flow in each direction and the fluctuation data of the stress; the thermophysical property of the single-component hydrocarbon fuel under the input working condition parameters is calculated; the thermophysical properties comprise thermodynamic properties, energy properties and transport properties; the thermophysical property of the single-component hydrocarbon fuel under the input working condition is corrected based on stability and nuclear density estimation, and a thermophysical property data set is obtained; and intersection of each thermophysical property data set of the stability correction-based single-component hydrocarbon fuel under the input working condition and each thermophysical property data set of the kernel density estimation-based correction-based single-component hydrocarbon fuel under the input working condition is solved, and an average value of data in the intersection is used as a corrected thermophysical property value.