50results about How to "Calculations are clear" patented technology

The invention discloses a determination method of tunnel surrounding rock prestressing force reinforcing anchor rod length and radial prestressing force values. According to the surrounding rock elastic-plastic theory and the plastic zone distribution regulation, and, on the basis that a tunnel plastic ring radius R and a surrounding rock pressure force are comprehensively determined, the minimum length value and a radial minimum prestressing force value of a tunnel surrounding rock reinforcing anchor rod are determined. The determination method advantageous in that, according to the surrounding rock elastic-plastic theory and the plastic zone distribution regulation, and, on the basis that the tunnel plastic ring radius R and the surrounding rock pressure force are comprehensively determined, the minimum length value and the radial minimum prestressing force value of the tunnel surrounding rock reinforcing anchor rod are determined, the calculation process is relative clear and concise, and a measured result is high in accuracy and accurate, has a small error compared with the actual and can guide the practice well.

The invention provides a method for determining the content of unfrozen water in a soil freezing process by using specific heat calculation. The method comprises the following steps: adopting the total heat of one temperature measuring point as the sum of soil particle heat, pore water heat, pore ice heat and heat released by phase change of water in soil; determining the physical properties of a soil sample by using indoor geotechnical test, and determining the phase change temperature range of the soil sample through freezing test; determining the specific heat of frozen heat at the corresponding temperature measuring point by using a calorimeter through mixed calorimetry; and expressing the four heats and the total heat by using the specific heat, deriving the unfrozen water content-specific heat function relation, and calculating to obtain the content of the unfrozen water at every temperature measuring point. The method for measuring the content of the unfrozen water has the advantages of simple operation and small test result error. General labs and construction units can use a simple calorimeter to measure and calculate the content of the unfrozen water.

The invention provides a method for calculating specific heat at a clay freezing stage by performing energy substitution on phase-change latent heat of water in soil. The method comprises steps as follows: specific heat of soil mass is obtained through superposition of weighted average of specific heat of solid components of soil in the soil mass and specific heat of water in soil and phase-change latent heat of water in soil; content of components in the soil mass in the phase-change temperature range is determined according to the indoor soil test, and specific heat, without consideration of the phase-change latent heat, of the soil mass is obtained; the phase-change temperature range is divided into a plurality of sections, the phase-change latent heat is distributed in the phase-change temperature range according to the content of unfrozen water in each section, absorbing and releasing heat in each temperature interval section during temperature changing is obtained, and a curve of the specific heat changing with the temperature in the phase-change temperature range is obtained; the specific heat of soil samples at corresponding temperature points is measured by a calorimeter instrument. The method has the benefits as follows: the blank of the relation of specific heat changing with the temperature in the phase-change process of the water in soil is filled up, and a specific heat-temperature function adopting the temperature as an independent variable and considering the phase-change latent heat in the clay freezing phase change process is established. The calculation result is accurate and reliable, and the method is simple and feasible.

The invention relates to an area-fixed edge computing system and a method for heterogeneous city internet of things, belonging to the technical field of the internet of things. The method comprises the following steps: S1, dividing the area into a plurality of virtual internet of things small grids according to the distribution density and position of GIS information and sensors in a specific areaof the city; S2, set at least one calculation point in each small mesh to be edge calculated, capture various sensor data in that small mesh, decoding the sensor data, calculating and screening out effective information, store, encrypting and uploading the information to a computing station; S3, combine a plurality of small grids into an enlarged grid, and arrange a computing station with multiple information sending and receiving and high computational power, picking up that uploading information of the computing points under the jurisdiction, classifying, analyzing and calculating, and deeply fusing heterogeneous information to generate imperceptible new information; S4: Upload the new information to the background server and download it to the application side. The invention converts the calculation of the edge into the calculation of the stationary type of the regional center, and improves the practicability and efficiency of the calculation of the edge of the urban internet of things.

The invention belongs to the field of aviation undercarriages and particularly relates to a ground load determination method of a multi-fulcrum airplane. According to the ground load determination method of the multi-fulcrum airplane, by means of equivalent conversion, a static indeterminacy calculation of the multi-fulcrum airplane is converted into a static determinacy calculation, further uneven distribution coefficients of multi-strut loads are introduced, load boundary values in every structural design of undercarriages can be effectively guaranteed, therefore, certain guiding functions are provided for optimizing the structural designs of the multi-strut undercarriages and improving the accuracy of the design of the multi-strut undercarriages. Besides, the calculation idea of the ground load determination method of the multi-fulcrum airplane is clear and rigorous, the calculation method is reliable and easy to comprehend and master, so that the ground load determination method of the multi-fulcrum airplane has a broad application prospect in engineering design of the multi-strut undercarriages. During the actual usage, the quantity of the research trials of the loads of the multi-strut undercarriages can be reduced by applying the ground load determination method of the multi-fulcrum airplane, so that obvious advantages of saving the design cost and shortening the design cycle of the multi-strut undercarriages can be achieved.

The invention discloses a combined decision method for power generation plans of a multi-type power supply. The multi-type power supply includes a power generation system composed of thermal power, wind power and hydropower. According to the combined decision method, an optimal start / stop state of a thermal generating set is selected according to requirement information of the power grid as well as a power balance analysis result; an optimization model coordinated with the multi-type power source is established, active output of wind power-thermal power-hydropower sets is optimized in a combined manner; and the safety of an active output plan of the multi-type power supply is checked, a start / stop plan of a thermal power set is corrected by iteration, and a combined power generation plan of the multi-type power supply is generated finally. According to the method, wind power prediction data is introduced into power balancing, start / stop of the thermal power set is arranged in advance, and a peak-clipping and valley-filling function of a hydropower set is used, so that a combined decision for a power generation plan for the thermal power, wind power and hydropower included power supply is realized, the generating amount of the thermal power set is replaced or reduced, and the clean energy consumption level of the power grid is improved.

The invention discloses a position measuring system for a heading machine cutting head. The position measuring system comprises an inertial measurement unit module, a laser range finder module, a heading machine parameter acquiring module, a CPU calculation module, a CAN communication module and an upper computer module; the inertial measurement unit module achieves attitude measurement on a moving carrier, the laser range finder module achieves range measurement in the system heading direction, the heading machine parameter acquiring module achieves reading of machine body parameters, the CPU calculation module is used for data transmission and position calculation, and the CAN communication module achieves data transmission and interaction. According to the position measuring system for the heading machine cutting head, multi-sensor information integration is achieved, data communication is achieved through the CAN module, the position information of the cutting head is calculated through the CPU calculation module, and then the position information of the heading machine cutting head is obtained.

The invention discloses a switch cabinet fault diagnosis method based on an on-line indirect temperature measurement mode. Judgment of fault states of the switch cabinet is conducted through temperature real-time monitoring carried out on an indirect temperature measurement point and an environmental temperature measurement point used for installation of temperature measurement sensors on the outside of the switch cabinet. According to the method, physical modeling and measurement point selection are firstly carried out; a temperature theta[2](t) of the indirect temperature measurement point and the temperature theta[0](t) of the environmental temperature measurement point are measured in real time; then a temperature theta[1](t) of a lumped heat source center inside the switch cabinet and a load ideal temperature theta[1](t)[LX] of the lumped heat source center and / or a determined load ideal temperature theta[2](t)[LX] of the indirect temperature measurement point are calculated; the measured temperature and the temperature obtained through calculating are compared with thresholds in a fault judgment standard to finally give a fault state diagnosis. The indirect temperature measurement method is employed in the invention to substitute for a complex and expensive direct temperature measurement mode. The operation is simple and the cost is reduced.

The invention discloses a black-start scheme evaluation method, which comprises the steps of asking L experts to give a ranking vector for all evaluation indexes used for black-start scheme evaluation and figuring out a subjective based on the weight ordered binary comparison method; figuring out an objective weight based on the method of variation coefficient, according to an initial decision matrix formed by the values of all evaluation indexes; figuring out a comprehensive weight based on the vector similarity theory; converting the initial decision matrix in the form of real values into a decision matrix in the form of a Vague set, and converting a weight vector into a vector in the same form with the obtained decision matrix; and ranking all schemes based on the PROMTTHEE method of the Vague set to obtain a ranking sequence. According to the technical scheme of the invention, the objective difference of data and the subjective preference of experts are well combined, and then a more reasonable index weight is given. Meanwhile, the priority relationship of quantization schemes can be quantized more accurately based on the PROMTTHEE method, so that the schemes can be completely ranked.

The invention discloses a method for calculating a structural disturbance degree of soft soil by utilizing changes of shear modulus. The method comprises the following steps: before sampling, carrying out field in-situ shear wave velocity testing to obtain an in-situ shear wave velocity; taking soil samples with different depths and marking; testing the obtained soil samples with different depths by utilizing a bending element shear wave velocity testing device respectively after stress of the soil samples is released and the soil samples are remolded so as to obtain a shear wave velocity under a stress-free state after sampling disturbance and a shear wave velocity after a soil body is remolded; calculating average effective stress and overlying effective stress of the soil body before sampling; and calculating to obtain the structural disturbance degree of the soil body, caused by sampling of each depth. The method disclosed by the invention is simple in testing step and accurate in testing result; and two influence factors including soil body structural disturbance (unrecoverable disturbance) and stress state changes (recoverable disturbance) in a sampling process are separated so that the structural disturbance degree of the soil body, caused by the sampling process, can be calculated in field and indoors respectively.

The invention discloses a new experimental data processing method of a structural DFR (Detail Fatigue Rating) experiment, and belongs to the technical field of structural fatigue strength experimentation, analysis and evaluation. The experimental data processing method comprises the following steps: firstly, according to relevant experiment requirements, obtaining the fatigue experiment data, including stress level and fatigue life, of each test piece; secondly, according to different stress levels of the test pieces, selecting a proper reduced stress level; thirdly, aiming at the experiment data of each test piece to calculate to obtain reduced fatigue life corresponding to the reduced stress level on the basis of a stress life conversion formula; and finally, on the basis of a design handbook of a relevant DFR method, obtaining the DFR allowable value of a checked position in the structure. Since the stress life conversion formula is introduced into the method, the experimental data processing method has the advantages of being wide in application range, clear in processing process and simple in calculation method.

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 discloses a method for point-to-point matching between non-rigid three-dimensional models. The method comprises the following steps: firstly, establishing an anisotropy spectrum manifoldwavelet descriptor; and taking the established descriptors as descriptor constraints of model points, and taking a thermonuclear relationship of each point on the model as a point pair relationship constraint to establish an objective function so as to realize optimal matching between the model points. According to the method, an anisotropy spectrum manifold wavelet descriptor is established at the earlier stage, and then a thermonuclear relationship is adopted as a point pair relationship constraint. Compared with an existing method, the anisotropy spectrum manifold wavelet descriptor has the advantages of being invariant in isometric deformation, capable of distinguishing intrinsic symmetry of the model, high in resolution capability and positioning capability, high in calculation efficiency and compact in structure. The thermonuclear relationship serving as a point pair relationship constraint is more excellent in calculation efficiency and stability than other methods adopting geodesic distance. Therefore, the method is clear in calculation, robust in result and accurate in matching.

The invention discloses a method for calculating the grid-connected capacity limit of a photovoltaic multi-infeed power system. For the photovoltaic multi-infeed power system, an extended admittance matrix is calculated, and the generalized short-circuit ratio and the generalized short-circuit ratio critical value of the photovoltaic multi-infeed power system are acquired. Whether the absolute value of the difference between the generalized short-circuit ratio and the generalized short-circuit ratio critical value satisfies a given threshold to calculate the sensitivity of the generalized short-circuit ratio of the photovoltaic multi-input power system to the rated capacity of each photovoltaic device, and the capacity of the photovoltaic device is finely adjusted and up-regulated. The sensitivity is recalculated, and the rated capacity of a fan device is adjusted again according to the sensitivity, and iteration is continuously carried out to acquire the capacity limit. The method provided by the invention has the advantages of clear calculation ideas and simple process, can acquire the maximum value of the grid-connected capacity of the photovoltaic multi-infeed power system under the condition of small disturbance stability margin, provides guidance for the construction and expansion of a photovoltaic power station from the perspective of small disturbance stability, and contributes to the comprehensiveness of planning and design considerations of the power system.

The invention provides a construction site carbon emission estimation method and system based on bill of quantities, The invention uses the bill of quantities as the basis to estimate the carbon emission, and the calculation method proposed by the invention is simple and easy to operate, the bill of quantities is prepared in the bidding stage of the project, and the obtaining is convenient, and the bill estimation method has the advantages of easy obtaining data, representing the production level of the enterprise, relatively small workload, and the like. The invention calculates through the bill of quantities, the calculation mode is clear and clear, the calculation is simple and convenient, the carbon emission amount of the construction project can be estimated truthfully and quickly, the goal control in advance can be realized, and the shortcomings existing in the prior calculation method can be overcome.

The invention provides a traffic any-ratio load method based on an Openflow rule. The method includes the steps that first, egress ports for traffic load distribution and the allocation ratio of each port are firstly configured, and the minimum number of streams of service traffic needing to be allocated by a load is calculated according to the scale value of the configured egress ports, wherein the service traffic needing to be allocated by the load is divided into streams; second, M fields of a message are selected according to the characteristics of load service, and a group of integer values are selected to respectively represent the mi-digit bit string in the binary 01 string of the ith field, wherein the M fields of the message may change randomly; third, after the field bits selected in the second step are permutated and combined, all the stream classification of the service is listed; fourth, the rules used for stream classification matching content corresponding to the same egress port and recorded in the third step are combined so that the hardware table item can be saved or the software performance can be improved; fifth, the rules recorded by software in the steps are issued to hardware or configured to a virtual router.

The invention discloses an industrial grey water footprint calculation method considering the environmental influence of a receiving water body, and belongs to the technical field of water pollution evaluation methods, and the method comprises the following steps: obtaining pollution discharge data of each enterprise in a region, and determining a water functional region corresponding to a pollutant receiving water body; according to the pollutant holding capacity of each water functional area, calculating the total pollutant standard-exceeding emission amount borne by the area; according to the proportion of the pollutant discharge amount, distributing the pollutant standard-exceeding discharge amount of the water functional area to each enterprise; calculating out-of-limit grey water footprints of each enterprise by adopting a critical dilution method; and calculating the industrial standard-exceeding grey water footprint of the region. By quantifying the standard-exceeding grey water footprint of a region, the influence of pollutants discharged in a standard-exceeding manner on fresh water resources is revealed. From the perspective of water function division, the natural condition of the received water body and the total amount control target of the limited pollutant are incorporated into the grey water footprint calculation method system, so that the grey water footprint evaluation of the region is more scientific and reasonable, and the method has certain technical guidance significance for determining the overproof water body and tracing the responsibility of the overproof enterprise.

The present invention related to the field of power system protection and control, presents a voltage travelling wave differential protection method considering the influence of frequency-dependent parameters, which provides more accurate and rapid fault identification. The technical scheme of the present invention is as follows: a calculation method of voltage travelling-wave differential protection for VSC-HVDC transmission lines, taking the influence of the frequency-dependent parameters into consideration, the steps are as follows: calculating a characteristic impedance and propagation coefficient of the frequency-dependent transmission line in time domain, collecting voltage and current signals at the both ends of the transmission line and then calculating the forward and backward voltage travelling wave, respectively, comparing a differential value of voltage travelling wave with a preset threshold value to determine whether the internal fault occurs.The present invention is mainly applied in the field of power system protection and control.

The invention relates to a roof fire collapse early warning device based on a temperature field and positioning and a using method. Arriving at a fire construction site, a fire detector inputs basic information to a building and roof structure information input module; a roof forcible entry person pierces the roof at a detection point and arranges at least three detection parts; a disposal part receives signals sent by the detection parts, and the three detection parts form a triangle including the center of a severely affected area of the roof, or projection equipment is used, and a wirelesscommunication machine of a rescuer is connected with a fire-fighting rescuer position dynamic acquisition module; in the collapse early warning monitoring process, a fire scene rescue commander pays attention to on-site fire behavior development condition information, an early warning grading module automatically determines the early warning level in real time and transmits an early warning instruction to an early warning sending module, a light display elevation recognition assisting assembly displays deformation of the detection point; and finally personnel threatened by collapse evacuate toa safe area. The device and method are provided for fire extinguishing rescue and related experiments, and huge social public safety benefits are achieved.

The invention discloses a method for calculating the carbonization depth of a concrete beam, which comprises the following steps of S1, fitting the square root of the carbonization depth and the carbonization time of the concrete beam under the coupling action of repeated load and carbonization erosion to obtain a formula of the carbonization depth, S2, fitting the square root of the carbonization depth and the carbonization time of the concrete beam which is not subjected to fatigue damage due to carbonization erosion at the same time period to obtain the carbonization coefficient of the concrete which is not subjected to fatigue damage, S3, calculating to obtain a fatigue damage influence coefficient and a fatigue damage degree, and establishing a relational expression between the two, S4, expressing the carbonization coefficient k0 of the concrete without fatigue damage by adopting the carbonization coefficient kP in the corrected Papadakis formula, and S5, substituting into the formula in S1 to obtain a calculation formula of the carbonization depth of the concrete beam. The invention provides a method for calculating the carbonization depth of a concrete beam. The method can effectively, accurately and quantitatively calculate the carbonization depth of the concrete beam under the coupling action of repeated load and carbonization erosion.

The invention discloses a power electronic multi-infeed power system key line identification method and system. The method comprises the steps that an extended admittance matrix of a power electronic multi-infeed power system is acquired, wherein the information based on which the extended admittance matrix is obtained comprises the feed-in capacity and the grid structure of the power electronic multi-feed-in power system; according to the characteristic value of the extended admittance matrix, the power electronic multi-infeed power system is equivalent to a plurality of power electronic single-infeed power systems with the same small interference stability, wherein the minimum characteristic value of the extended admittance matrix is the generalized short-circuit ratio of the power electronic multi-infeed power system; the characteristic value and the characteristic vector property are combined to obtain the sensitivity of the generalized short-circuit ratio relative to the admittance of each network line; and the key line of the power electronic multi-infeed power system is identified according to the obtained sensitivity sequence. The method can effectively reduce the problem of small interference stability in practical engineering application.

The invention relates to a simulation tracking self-recovery method for communication failure locomotives in a locomotive dispatching monitoring system. The method includes the following steps that: 1) when the head of a train set performs trans-section operation, an onboard unit records trans-section information with a fixed format in real time into a power-down protection memory; 2) after communication between an on-board host and a ground host fails, if the ground host operates normally, and a locomotive section position is simulated and tracked according to station yard element connectionrelationships and interlocking code position change information; 3) after the communication failure of the on-board host and the ground host is recovered, the on-board host judges whether a locomotivemeets a fault recovery condition, and the on-board host initiates a self-recovery network access application to the ground host if the locomotive meets the fault recovery condition; 4) after the ground host receives the self-recovery network access application of the on-board host, the ground host judges the validity of network access information, and the ground host sends the simulated and tracked section position information to the on-board host if the network access information is valid; and 5) after the on-board host receives the section position information of the ground, the on-board host calculates the specific position of the head of the train set. Compared with the prior art, the method of the invention has the advantages of low cost, high availability, and security.

The invention provides a rock burst early warning method based on dynamic and static load disturbance superposition. The method comprises the steps that firstly, an analytic hierarchy process is adopted for determining the dynamic and static load disturbance parameter weight, wherein static load disturbance is quantitatively described through a shock wave CT inversion wave velocity parameter, anddynamic load disturbance is quantitatively described through a microseismic accumulation shock effect parameter; and then, a weighted average method is adopted for determining a final impact dangerousarea and the danger level of the final impact dangerous area. The formula parameters involved in the method are clear in calculation, good in universality, easy to program and high in practicability,and the mine rock burst danger can be approximately early warned in real time in a large range.

The thermal monitoring of a converter for an electric motor of a vehicle should be improved. Therefore, the invention relates to a method in which the temperature of the converter is measured. In addition, the output power of the converter is determined. The temperature of the converter is estimated using a thermal model of the converter having the output power as an input variable. The estimated temperature is compared with the measured temperature, and a corresponding monitoring signal is provided. Thus, a deviation of the measured temperature for the calculated temperature and thus a corresponding error in the cooling system can be detected even in the partial-load range.

The invention discloses a measurement and calculation method of a turbine shaft system center. The measurement and calculation method comprises the following steps: firstly, carrying out modeling on a turbine shaft system before repair, and measuring the center number value of the turbine shaft system before repair, the length of each rotor and the diameter of the rear clutch of each rotor to obtain the modeling data of the turbine shaft system before repair; then, according to the modeling data of the turbine shaft system before repair, calculating the adjustment amount of each rotor clutch; and taking the adjustment amount of each rotor clutch as an intermediate value to calculate to obtain the adjustment amount of a corresponding rotor bearing so as to calculate the adjustment amount of a corresponding bearing regulation spacer according to the adjustment amount of each bearing and the position of each adjustment spacer. Firstly, the center number value of the turbine shaft system before repair is measured, the adjustment amount of each rotor clutch is calculated, the adjustment amount of each rotor clutch is taken as the intermediate value to calculate the adjustment amount of the corresponding bearing, an influence value on a rear clutch opening value after the rotor bearing is regulated does not need to be measured and calculated, measurement and calculation can be well organized, and a measurement and calculation amount and measurement fault possibility are effectively reduced.

The invention discloses a method for determining the outer dimension of a marine monitoring platform based on the human factor engineering principle. In particular, the method comprises the followingsteps: 1) determining the restriction relationship between the outer dimension of the monitoring platform and the main dimensions of a human body; 2) determining the knee space of the monitoring platform; 3) determining the maximum height and the thickness of the working surface of the monitoring platform; 4) determining the working surface depth gs of the monitoring platform and the visual distance sd of the operator. The invention fully considers the human body size of the crew, and makes the outline size of the marine monitoring platform accord with the human factor engineering principle, so as to meet the comfort requirements of the crew.

The invention discloses a method for calculating apparent diffusion parameters based on an iterative analysis method in a diffusion test, wherein the method comprises the following steps: firstly, according to a basic reaction principle and a law of conservation of mass of diffusion, based on a Friedel-Crafts first law, a Friedel-Crafts second law, diffusion behavior characteristics of solutes ina porous medium, experimental initial conditions and experimental boundary conditions, integrating to obtain a diffusion reaction equation; secondly, obtaining an approach line parameter by using a graphic processing approach method, and further obtaining an initial apparent diffusion coefficient and an initial effective diffusion coefficient; and finally, repeatedly iterating and analyzing by using a parameter identification method based on an iteration and analysis method, and continuously reducing a normalized root-mean-square error to finally obtain an apparent diffusion coefficient with asmaller error. The method is simple, high in accuracy and wide in application range.