81results about How to "Reliable theoretical basis" patented technology

The invention relates to a multi-support shafting finite element method with bearing stiffness coupling nonlinearity considered. The method comprises the steps of (1) establishing a local coordinate system of each bearing and obtaining a six-freedom-degree bearing stiffness matrix of each bearing under the corresponding local coordinate systems through calculating by means of the difference method with a corresponding bearing load calculation formula; (2) dividing a shaft into different shaft sections according to the difference of diameters, establishing nodes at the positions of bearing section starting positions, the bearing installation position and load action positions, then establishing finite element models of the shaft between the nodes, and obtaining a stiffness matrix of the whole shaft; (3) establishing a global coordinate system of a shafting, establishing another node at the bearing installation position to be used for simulating a fixed end, integrating the bearing stiffness matrix onto the installation node and the corresponding fixed end node on the shaft to obtain the overall stiffness matrix of the shafting, and establishing the stiffness equation of the shafting; (4) restraining the freedom degrees in six directions of the fixed end node, restraining the freedom degree, of rotating around the axis, of the node at the position of origin of the global coordinate system of the shafting, reducing the stiffness equation of the shafting according to restraining conditions, and solving the reduced stiffness equation of the shafting with the Newton-Raphson method in an iterative mode to obtain the displacement and load of each node.

The invention relates to a finite element analysis method for crack propagation, in particular to a numerical value analysis method using wavelet extension as a new finite analysis unit. The method comprises the following steps that: based on a computer-aided drawing software, a gear meshing model containing any crack failure is built; the module is imported into a finite element analysis software ABAQUS, and geometric data of a finite element mesh is obtained by combination of ABAQUS meshing and data output functions; according to the obtained data, a mathematics-assisted calculation software is applied to a program to calculate the element stiffness matrix of a wavelet extension unit, and then according to the mesh of the analyzed structure, the overall stiffness matrix of an integratedstructure is arranged; and after boundary constraint conditions and loads are introduced, a finite element equation is solved to obtain the numerical value solution of crack propagation. In the invention, the growth conditions of cracks can be tracked, and the difficulty brought by highly concentrated stress is also solved; and the method has higher computational accuracy and higher computationalefficiency, and facilitates the study of fault diagnosis of mechanical equipment.

The invention relates to a method for the simulation analysis on the meshing stiffness of a cylindrical spur gear undergoing damaged single-tooth failure. The method comprises the following steps: firstly, setting the correction coefficient of the meshing stiffness of single-tooth and double-tooth meshing section on the basis of the calculation results of the average stiffness according to the finite element method and the national standard method, so as to improve the calculation accuracy of the meshing stiffness of a normal gear according to the energy method; secondly, establishing a finite element model of the spur gear undergoing damaged failure targeting on the failure location of the spur gear by combining the three-dimensional modeling software and the finite-element analysis software, and compiling a simulation calculation program by using the computer language, so as to calculate the time-varying meshing stiffness; and finally, integrating the calculation results of the two steps to obtain the integrated meshing stiffness of the spur gear. By fully integrating the advantages of the corrected energy method and the finite element method, the invention can not only guarantee the calculation accuracy, but also improve the calculation efficiency. The method of the invention for the simulation calculation of the meshing stiffness of the gear undergoing damaged single-tooth failure is effectively applicable in the research on the vibration response mechanism of a gear system.

This invention discloses a selecting method of service quality route under the condition of dynamic network. The process includes: measuring measurement parameters of all communication links in the network and obtaining the property and the changing condition; determining the weight changing interval and the distribution function of plural service quality measurement parameter on each link based on the original topological structure of the network and the property and changing condition of the link parameter of any one of communication links in the network; determining the limiting value of each measurement parameter based on the service quality order of the connecting request; constructing a set of alternative paths, computing the interval of each measurement parameter of the alternative paths based on the property and the distribution interval of each link measurement parameter on the alternative paths; determining the distribution rule and the mathematical expression of the measurement parameter of alternative paths; computing probability of the alternative paths satisfied with the limitation and selecting the biggest path with the limitation satisfied with the probability as the working route. This invention has advantages of quick computing, stronger direction and direction and can be used for selecting the service quality route under the condition of dynamic network.

The invention discloses a bridge deflection test method based on inclinometers. The bridge deflection test method comprises the following steps: an inclination measurement step for measuring the cross section corners of a bridge by setting the inclinometers at a plurality of cross section positions of the bridge so as to obtain the corner values of the inclinometers; a deflection test step for obtaining the combination coefficient of an n-order vibration type based on the difference of corner values collected by each inclinometer at the same moment and the initial corner value of each inclinometer and calculating to obtain bridge deflection based on the combination coefficient. The invention also discloses a bridge deflection test system based on the inclinometers.

The invention provides a modal analysis method under the influence of impeller structure thermal stress on the basis of ANSYS. The modal analysis method has the following technical scheme: utilizing a solidworks parametric modeling method to establish a three-dimensional model of an impeller structure; introducing the three-dimensional model of the impeller structure into finite element analysis software ANSYS, finishing setting a unit type, material attributes and material parameters in an ANSYS software pretreatment module, and dividing finite element grids; applying temperature load to the impeller structure through a linear interpolation method, and carrying out thermoanalysis on the impeller structure; coupling a thermoanalysis result to a structural unit, and carrying out statics analysis to obtain the thermal stress of the impeller structure; and on the basis of an obtained thermal stress result, carrying out modal analysis which contains prestress on the impeller structure to obtain first five orders of inherent frequency. The modal analysis method has the beneficial effects that a theoretical basis is provided for the research of the failure mechanism of the impeller structure.

The invention discloses a modified whole genome correlation analysis algorithm based on a channel. The correlation analysis algorithm adopts a principal component analysis method and a maximal mean value method to build gene statistic for first time, removes interaction effect among SNP, and effectively solves the problem of SNP chain in genes; the strategy is applied to Simon Tal beef cattle GWAS data; remarkable correlation between two passages (a gamma propalanine channel and an NAFLD channel) and two characters (live weight before slaughter and area of eye muscle) is founded; reliable reference is provided for beef cattle modification breeding; reliable theoretical basis is provided for further molecular verification.

The invention discloses a highway stereoscopic line type safety evaluation method based on vehicle dynamics simulation and an accident tree. The method is characterized by comprising the steps that a vehicle-3D highway-driver control coupling simulation model is set up, and dynamic feature indexes, namely, the vehicle longitudinal velocity, the side slip angle, the yaw velocity and tire vertical force, fed back when a vehicle runs on a highway are acquired; then the accident probability of sideslip, side turning and rear-end collisions at all highway pile number positions is calculated according to the acquired dynamic feature indexes, and the comprehensive accident probability at the highway pile number positions is acquired based on an accident tree model through calculation; finally, after the highway is segmented according to linear highway sections and flat curve highway sections, the accident probability of each highway section is calculated according to the comprehensive accident probability at all highway pile number positions in the highway section to reflect the safety of the highway stereoscopic line type. The method is suitable for safety evaluation of a newly built highway at the design stage, and the design safety level of the highway line type can be evaluated quantitatively and accurately; the method is also suitable for safety evaluation of the highway at the operation stage, and quantitative guidance is provided for later safety improvement strategies.

The invention discloses a knowledge fusion method based on D-S (Dempster-Shafer) evidence theory. The knowledge fusion method comprises the steps of S1, obtaining sample data in each field, S2, determining a discernment frame of scientific experiments, S3, determining the probability of each discernment element in each field, S4, calculating the BPA value of each discernment element in each field, S5, obtaining a similarity distance function between the BPA values of any one discernment element in any two fields through calculation, S6, calculating the similarity measure between the BPA values of any one discernment element in any two fields, S7, calculating the support degree of any one discernment element, S8, calculating the credibility of any one discernment element from all support degrees of the discernment element, and S9, obtaining the BPA value of every discernment element after fusion from the credibilities of all the discernment elements. The knowledge fusion method is applicable to fusion of multiple reasoning result knowledge having great varieties and indeterminacy and one-sidedness.

The invention provides a multi-source traffic information fusion method which comprises the following steps: all kinds of traffic information is preprocessed and is on a unified processing road network; the preprocessed traffic information is fused in a weighting method, and road sections without traffic information coverage after fusion are filled to form complete traffic information; and the complete traffic information is generated and released according to a standard position. According to the invention, floating car traffic information is fused with non-structured traffic information such as micro-blog information, event information, traffic website information and the like, and historical traffic information is used as a data source and fused with real-time traffic information based on the rules of the historical traffic information.

The invention relates to the technical field of measurement, in particular to a remote elevation measuring method based on similar triangles. The remote elevation measuring method is characterized by comprising the following step: calculating the elevation of a point to be measured through a horizontal distance between a set site and a projection point of the point to be measured on an elevation level surface of the set site, a horizontal distance between the set site and the projection point of a second reference point on the elevation level surface of the set site, and space coordinates of the projection point of the second reference point on a connecting line of the set site and the point to be measured according to a geometrical relationship of the similar triangles. The remote elevation measuring method disclosed by the invention has the advantages that the formula derivation process is simple, the theory basis is reliable, the operation process is simple, and the elevation measurement precision is high.

The invention discloses a method for calculating the residual bearing capacity of a concrete T-shaped beam by considering the influence of a fire crack, and relates to the technical field of methods for calculating the bearing capacity of buildings after a fire. The calculation method comprises the following steps: 1, calculating the depth and width of the fire crack; 2, according to the calculation result of the depth and the width of the fire crack, carrying out analog calculation on the section temperature field of the concrete T-shaped beam with the crack; and 3, calculating the residual bearing capacity of the T-shaped beam after the fire according to the temperature field of the section of the concrete T-shaped beam with the cracks and the comprehensive influence factors, and obtaining a residual bearing capacity prediction simplified formula. According to the method for calculating the residual bearing capacity of the concrete T-shaped beam with the cracks after the fire, the influence of high temperature and the cracks on the residual bearing capacity is comprehensively considered, the simplified calculation formula of the residual bearing capacity of the concrete T-shapedbeam after the fire considering the crack influence is obtained, and the calculation precision of the residual bearing capacity is effectively improved.

The invention discloses an intelligent girder segment matching installation control system. The intelligent girder segment matching installation control system comprises an angle sensor and a central control unit, wherein the angle sensor is arranged at the front end of a girder segment to be installed and is used for collecting the data of the included angle between the girder segment to be installed and an installed girder segment; the central control unit is in communication connection with the angle sensor so as to receive the included angle data of the girder segment to be installed and convert the included angle data into altitude data xi of an installation point of the angle sensor; and the central control unit judges whether the height difference of the altitude data xi of the installation point and the theoretical installation height h1 of the girder segment to be installed at the position of the installation point is larger than 2 mm or not, and if yes, the central control unit sends a starting signal to a bridge floor crane. According to the intelligent girder segment matching installation control system, by setting the position relation between the angle sensor and the girder segment and measuring the relative included angle between the girder segments, errors caused by steel girder vibration is avoided, the procedures of the whole girder segment matching process are simplified, informationized and intelligentialized, the control precision is fundamentally guaranteed, and meanwhile the labor cost is also reduced.

The invention is a kind of online parameter measuring method and device for triphase compound fluid, which belong to fluid measuring technology field. It provides a measuring method and device for solving the weight flux and weight density of triphase compound flow. The technology project is: A. separates the mixed fluid: the mixed fluid is decelerated and distributed; the fluid with large density enters the subjacent loop pipes; the fluid with small density flows into the upper loop pips; B. data extraction: extracts five pressure differences values of fluid in the pipe and after being distributed; C. data processing: the extracted data are input into the intelligent displaying device to be processed, acquires the weight density ªÐB1, ªÐB2, ªÐB3 of each ingredient in the triphase compound fluid. The invention not only can detect the weight flux, compound thickness of the triphase compound fluid, but also can detect the weight flux and weight density of each ingredient.

The invention relates to a comprehensive utilization method of polysilicon production waste, and improves the Siemens method polysilicon production process which produces waste, such as silicon tetrachloride, trichlorosilane, dichlorosilane, etc. The comprehensive utilization method comprises the following three steps: the first step: conversion of the polysilicon production waste. The temperature is controlled between 20 DEG C and 1400 DEG C, the waste is converted into silicon and chloride by using the reaction between active metal and polysilicon production waste. The second step: the utilization of silicon. The produced silicon can be used as commercial polisilicon after collection, impurity separation and treatment. The third step: the utilization of chloride. The utilization of chloride can be realized in two ways: direct utilization, and the electrolysis and fusion of chloride, so as to reutilize obtained metal and chlorine. The comprehensive utilization method has the advantages that all products can be recycled and utilized without the discharge of three wastes; the reaction is easy to realize and automation can be realized in the reaction process; the quality of products is stable, and the purity thereof is high; and the method has great economic and social benefits.

The invention discloses a pipe-soil dynamic coupling effect analysis method. The method comprises steps as follows: establishment of a pipe-soil dynamic coupling effect analysis model, determination of a nonlinear hysteretic loop of soil mass according to the maximum depth of a pipeline structure embedded into the soil mass, and the like. The pipe-soil dynamic coupling effect analysis method has the advantages as follows: the influence of various factors such as undrained shear strength of seafloor mud surface soil mass, vertical increment of undrained shear strength of the soil mass, the pipe trench shape, surface roughness of the pipeline structure, the nonlinear hysteresis effect of the soil mass and the like are taken into consideration, support stiffness of seabed soil mass on the pipeline structure and the damping coefficient of the soil mass are determined according to the position and the direction of motion of the pipeline structure, the maximum depth of the pipeline structure embedded into the soil mass is updated in real time according to the motion condition of the pipeline structure, so that one novel pipe-soil dynamic coupling effect analysis method is established, the problem about the dynamic coupling effect of the pipeline structure and the seabed soil mass is solved, and an effective analysis method and reliable theoretical basis are provided for the dynamic coupling effect between the seabed soil mass and the pipeline structures such as a seabed pipeline, a catenary stand pipe and the like.

The invention provides a design method of a vertical finned tube type heat exchanger. The design method comprises the following steps: a, determining the total heat exchange amount of the vertical finned tube type heat exchanger; b, determining a total heat exchange area according to the total heat exchange amount; c, determining the arrangement mode of vertical fin heat exchange tubes of the vertical fin tube type heat exchanger according to the total heat exchange area; d, determining the air side heat transfer coefficient and the resistance coefficient of the vertical finned tube type heatexchanger through experiments according to the total heat exchange area of the vertical finned tube type heat exchanger, the determined parameters of the vertical finned tube type heat exchanger in the arrangement mode and the air flowing direction; e, checking and calculating the heat exchange area and the resistance coefficient of the vertical finned tube type heat exchanger according to the airside heat transfer coefficient and the resistance coefficient; and f, shaping the vertical finned tube type heat exchanger according to the checking calculation result so as to obtain a shaped product.

The invention provides a tobacco online weighing device which comprises a belt conveying device I, a belt conveying device II, a transport weighing device, a PLC control system and a computer. The belt conveying device I is provided with a photoelectric sensor and a travel switch. The PLC control system controls the working of a servo motor. When the photoelectric sensor detects an electric signal, the photoelectric sensor sends a command to the servo motor to control the servo motor to start working to drive the transport weighing device to move to the direction of the belt conveying device II, when the transport weighing device returns and touches the travel switch, the servo motor stop working, and a strain type weighing sensor transmits detected data to the computer at the same time. According to the device, through using a crank slider mechanism, the tobacco on the belt conveying device I is transported to the belt conveying device II in the process of weighing, the weighing is completed in the conveying process, the online real-time weighing of the tobacco is realized, the efficiency is improved, and the extraction of the subsequent characteristic parameters in the belt conveying device II is not affected.

The invention relates to a power grid intranet security management and vulnerability automatic verification method and system. The method comprises the following steps: 1) reading threat information from a server; 2) analyzing information based on a natural language processing NLTK library, and performing information classification by using a CNN-based convolutional neural network; 3) introducingan ID3 decision tree and a Boltzmann neural network algorithm, quantitatively evaluating the security threat of the intelligence, and early warning a high-risk event in advance; 4) establishing a vulnerability management knowledge base based on power grid intranet security risk closed-loop management driven by intranet asset identification and extranet intelligence, and 5) performing threat intelligence information sharing between the power grid intranet and the server. The problem of insecurity of the power grid intranet is solved.

The invention relates to a hypoid gear contact calculation method considering a misalignment quantity influence. The method comprises the following steps of constructing a hypoid gear finite element contact calculation model, carrying out gear finite element contact calculation not considering the misalignment quantity influence and calculating an equivalent meshing force direction unit vector and an equivalent meshing node coordinate, constructing a gear transmission system finite element model, calculating a gear transmission system finite element statics model and calculating a gear center beam element node displacement vector and a misalignment quantity reference node displacement vector, changing orientation of the hypoid gear finite element contact calculation model, carrying out gear finite element contact calculation considering the misalignment quantity influence, carrying out an iterative solution between the gear finite element contact calculation considering the misalignment quantity influence and transmission system finite element model statics solution, calculating a statics equilibrium state of the gear finite element contact calculation model and the transmission system finite element model, and calculating a hypoid gear contact calculation result accurately considering the misalignment quantity influence.

The invention discloses a frequency spectrum overlaying based step blasting millisecond delay suppression and vibration reduction method. The method comprises the following steps of carrying out a field single-pore blasting test to obtain corresponding blasting vibration data; importing the obtained vibration data into a Matlab, conducting Hilbert-Huang Transformation (HHT) to obtain a marginal spectrum diagram and a percentage energy distribution diagram of the vibration data and judging the blasting earthquake wave frequency range of a blasting zone during blasting operation through a single-pore blasting vibration frequency spectrum diagram; determining the reasonable detonation section number and the delay time within the obtained frequency range according to the formula derived on thebasis of the frequency spectrum overlaying principle; and carrying out a trial blasting test and adjusting related blasting parameters according to the blasting effect. Through the frequency spectrumoverlaying based step blasting millisecond delay suppression and vibration reduction method, the problem that the millisecond delay blasting delay time is difficult to select can be solved well, thedual indexes of the blasting vibration master oscillator frequency and the vibration amplitude serve as the standards for measuring the vibration reduction effect, and the one-sidedness that the blasting effect is evaluated through the single index is avoided.

The invention discloses a traffic unit safety evaluation method based on a non-complete elastic collision theory, and the method comprises the steps: 1, selecting a proper straight line conflict risk index, and constructing a non-straight line conflict risk index; 2, establishing a one-dimensional collision model under linear collision and a two-dimensional collision model under nonlinear collision according to a non-complete elastic collision theory, and constructing collision severity index extension based on the models; 3, calculating the conflict risk and severity of the indexes for identifying the traffic units under different parameters, and collecting the accident rate and accident severity of the same place; and 4, selecting the optimal parameter of the index, and evaluating the safety level of the traffic unit. According to the method, the dangerousness before and after the vehicle arrives at the conflict point can be accurately described, the influence of vehicle deformation recovery in the collision springback stage on the conflict severity evaluation result can be accurately represented, and the evaluation precision of the conflict dangerousness index and the conflict severity index is improved, so that the accuracy of traffic unit safety evaluation is improved.