31results about How to "Meet engineering precision requirements" patented technology

The invention belongs to the field of petroleum engineering, and particularly relates to an automatic hydrate preventing device for a deep water gas well test and a preventing method. The automatic hydrate preventing device for the deep water gas well test comprises an automatic data monitoring, acquisition and processing system and an automatic inhibitor control injection system, wherein the automatic data monitoring, acquisition and processing system lays the foundation for judgment of hydrate generation and correction by monitoring parameters of temperature, pressure, liquid flow, gas flow, liquid mineralization degree and gas component in real time; acquired data are processed, and a hydrate judgment result and an inhibitor adjusting result are given; and the automatic inhibitor control injection system rapidly sends a control signal according to the processing result of an upper computer, an executing mechanism is used for performing execution, the working parameters of an inhibitor injection pump are adjusted, and inhibitor injection is adjusted. According to the method and the device, the test condition can be automatically monitored in real time in the whole journey, the hydrate inhibitor injection speed is automatically controlled, and the automatic prevention purpose of hydrate is achieved.

The invention provides an island micro power grid probabilistic load flow analytic calculation method. The calculation method is provided for calculating an operation state of an island micro power grid including intermittent DG such as photovoltaic electricity, wind power and the like; loads of the island micro power grid fluctuates randomly. A conventional island micro power grid steady state load flow analysis method is mainly based on load flow calculation, a load flow result of only a single operation point can be obtained, research on probabilistic load flow calculation is only based ona simulation method which requires computational statistics on a large amount of samples so as to obtain a probabilistic load flow result, online analysis can be adversely affected due to long computation time, and correlation of DG contribution in the micro power grid is mostly not taken into consideration. To overcome the above limitations, the invention provides the island micro power grid probabilistic load flow analytic calculation method via which rapid island micro power grid probabilistic load flow calculation can be realized, requirements for engineering accuracy can be met, and the method disclosed in the invention can be used for on-line analytical application.

The invention discloses an irrelevant multisource frequency domain load identification method based on a COMI-PSO (comprehensive improved particle swarm optimization) algorithm. The method includes the steps: firstly, decoupling a dynamical equation of load identification according to irrelevance of a plurality of load sources; secondly, identifying loads by the aid of a transfer function based on a unary linear regression model and the least square solution; thirdly, searching a feasible load solution and minimizing the maximum relative error of measured response; finally, performing search by the aid of the COMI-PSO algorithm to solve a simple target optimization problem, and identifying a plurality of irrelevant load sources. According to response signals of a plurality of measuring points, a plurality of irrelevant frequency domain load sources can be simultaneously identified, the problem of difficulty in obtaining the transfer function can be thoroughly solved, occurring ill-posed problems are solved by matrix inversion at resonant frequency, precision of multi-element load excitation identified by the method and sensitivity to measuring noise are superior to those of a traditional method, and 3db engineering precision requirements can be basically met.

The invention discloses an algorithm for the maximum jump height of deicing of a single-span iced power transmission line. According to the patent application, a single-span power transmission line deicing theory analysis simplified model is established, the deicing load of the power transmission line is regarded as a sudden dynamic load, and based on the cable structure theory and the energy method, the maximum jump height calculation simplified method of the single-span ice-coated power transmission line is provided for design and ice-resistant reinforcement reference. The method comprises the following steps: S1, analyzing the deicing state of an iced power transmission line; s2, establishing a dynamic tension and maximum jump height relation model; and S3, solving based on an energy principle.

A construction and retrieval method of aircraft vibration fault database based on perceptual hash algorithm includes that a test data, a filtering, a resampling, a wavelet transform are read, and time-frequency domain data matrix is transformed into gray-scale image, the gray-scale image is mapped to a new fixed-size gray-scale image by hashing algorithm, the mapped gray-scale image is mapped twice and converted into binary image, the elements in the binary image matrix are rearranged to generate a hash value; the generated hash value is compared to the hash value in the database one by one, coherence coefficient is calculated: and then the fault analysis and prejudgment are carried out. The invention summarizes the vibration fault data and experience of civil aircraft, constructs the vibration fault database of civil aircraft, directly processes the collected complete vibration data in time domain, and compares the data with the data in the database, so that the fault type can be quickly located, the engineering use precision can be satisfied, the engineering is safe and reliable, and is suitable for popularization and popularization.

The invention discloses a method for determining an IV characteristic fitting curve of a crystalline silicon photovoltaic cell. With the crystalline silicon photovoltaic cell as an object, the invention provides data in a data manual of the photovoltaic cell without solving a transcendental equation and any measured data. Disclosed is a method for simply fitting a left side and a right side of themaximum power point of the IV characteristic curve of the crystalline silicon photovoltaic cell by the two second-order Bezier functions, the IV characteristic fitting curve of the crystalline silicon photovoltaic cell meeting the engineering precision requirement is given by finding out the linear law between the control point position of a Bezier function curve and a filling factor of the crystalline silicon photovoltaic cell.

The invention provides a transportation aircraft climbing performance data real-time calculation method, which comprises the following steps: acquiring input data including aircraft basic layout parameters, aircraft longitudinal aerodynamic characteristic data and engine power data; determining a climbing speed range and corresponding aerodynamic characteristic data of the transportation aircraft according to the input data, fitting aircraft longitudinal aerodynamic characteristic data required by climbing performance into a linear function or polynomial form, fitting engine power data into a polynomial form, and forming a fairing curve; and carrying out approximation on the lift curve model and the climbing rate model of the airplane in the climbing state, and calculating to obtain the climbing rate, the fast lifting speed, the corresponding climbing rate and the corresponding lift limit. According to the method, the relevant parameters of the climbing performance can be calculated in real time, a climbing performance database with huge data does not need to be established, the workload of aircraft designers is relieved, and the working efficiency is improved.

The present invention discloses a method for recognizing the tension of an arch bridge boom by considering a plurality of factors of an environment. The method comprises the steps of: establishing anarc bridge boom tension calculation model, deducing an analysis expression of the tension and a lateral vibration frequency of a boom in a complex boundary condition, for facilitating engineering application, giving a boom tension practical expression through adoption of a boundary influence coefficient method, performing example verification, analyzing the calculation precision, application features and differences of each expression to provide reference for determination of the boom tension. Through consideration of the conditions such as flexural rigidity and the length of the boom, a vibration reduction pad, additional mass, elastic support, a sticky sheath and an environment temperature, the analysis expression of the tension and the vibration frequency of the boom is high in calculation precision and is suitable for tension vibration test calculation of booms with various lengths in a construction period and an operation period, the boom tension practical expression is high in calculation precision based on the boundary influence coefficient to meet the engineering precision demand, the mode is an explicit expression form, and the practicability is high.

The invention discloses a rapid determining method of structural response driven by broadband and an unsteady-state signal and is based on wavelet decomposition. The method is based on structural response calculation of drive signal decomposition angles, the facts that engineering precision of calculated results is satisfied and the stability of the computational results is ensured are well achieved, and computational efficiency is significantly improve. The method comprises the following steps of (1) selecting a wavelet basis function, conducting the wavelet decomposition on a drive signal, and obtaining narrow-band and steady signals of different frequency bands; (2) adopting a mode superposition method to calculate low-frequency excitation response, adopting a Newmark method to calculate intermediate frequency excitation response and adopting an immediate integration method to calculate high-frequency excitation response; (3) adopting a linear interpolation method to conduct interpolation, and conducting dynamic response interpolation on a low-frequency drive signal, an intermediate frequency drive signal and a high-frequency drive signal in step (2); and (4) conducting linear superposition of dynamic response interpolation on the low-frequency drive signal, the intermediate frequency drive signal and the high-frequency drive signal, and obtaining dynamic response, driven by original broadband and unsteady-state load signals, of a linear system.

The invention belongs to the field of aero-engine design, and particularly relates to an aero-engine starting simulation model correction method based on test data, and the method comprises the steps: calculating a correction value under a preset condition, and carrying out the simulation calculation of the calculated correction value to obtain a simulation correction value under a target condition, and calculating the rotating speed under the target condition through the obtained correction value. By adopting the method, the starting simulation precision can be greatly improved, the maximum error of high-voltage and low-voltage rotating speed simulation and actual comparison is within 6.9%, and the engineering precision requirement is met.

The invention provides an inversion feedback type regeneration device simulation method suitable for power flow simulation calculation, and the method comprises the following steps that a main circuit model which is formed by connecting two branches in parallel is established, wherein the first branch is formed by connecting a switch element K1, a resistor element R and a controlled voltage source Uiv in series, and the second branch is formed by connecting a switch element K2 and a controlled current source Iiv in series; a control system calculation unit is established, and calculation of each simulation step length is carried out according to constant parameters set before simulation and the direct current network side voltage udc and the direct current network side input current idc, collected in simulation, of the main circuit model. Complex electrical external characteristics of the inversion feedback type regeneration device are simulated by establishing the universal main circuit model and the control system calculation unit, a converter circuit containing a large number of power electronic devices does not need to be established, the engineering precision requirement is met, and the simulation speed is guaranteed.

The invention provides an open channel flow measurement method, system and device and a storage medium, and the method comprises the steps: building a CFD model of a to-be-detected open channel section during normal water supply, and carrying out the fitting of the CFD model to obtain a flow velocity field of the open channel section; extracting flow velocity data on a plurality of measuring vertical lines in the open channel section flow velocity field based on the flow velocity field; according to the flow velocity data on the plurality of vertical lines, obtaining flow velocity distribution on the plurality of vertical lines and a transverse flow velocity distribution rule of the plurality of vertical lines, and further obtaining a flow velocity distribution rule of the open channel section; and actually measuring the flow velocity value of a reference point of the open channel section and calculating the total flow of the open channel section in combination with the flow velocity distribution rule; fitting an open channel section flow velocity field by establishing a CFD model, fitting a section flow velocity distribution rule curve through the flow velocity field, and achieving accumulated calculation of open channel section flow through flow velocity values of fewer actual measurement points. The actual measurement workload can be remarkably reduced, the flow measurement and calculation result is stable and reliable, and the engineering precision requirement is met.

The invention relates to a method for calculating the bearing capacity of a confined concrete combination column under the action of bias pressure, the combination column comprises a polygonal steel pipe and a corrugated plate, and concrete is poured in the polygonal steel pipe to form second cavity concrete; every two adjacent polygonal steel pipes are connected through a corrugated plate, the polygonal steel pipes and the corrugated plates are welded to form a special-shaped multi-cavity body, and concrete is poured into the special-shaped multi-cavity body to form first cavity concrete. The bearing capacity of the confined concrete combination column under the action of bias pressure is jointly determined according to the first cavity concrete bearing capacity, the second cavity concrete bearing capacity and the polygonal steel pipe bearing capacity in the special-shaped multi-cavity. According to the method, the bias bearing capacity of the combination column can be calculated only by restraining information such as the strength and the geometric dimension of the material of the concrete combination column, the problem of overload of the combination column is solved, and meanwhile the engineering precision requirement can be met.

The invention provides an AC-DC bidirectional converter simulation method suitable for power flow simulation calculation, and the method comprises the following steps: establishing a main circuit model which is composed of a DC loop and an AC loop which are not connected; wherein the direct-current loop has two branches: the first branch is formed by connecting a switch element K1, a resistor element R and a controlled direct-current voltage source Ucon in series, and the second branch is formed by connecting a switch element K2 and a controlled direct-current current source Icon in series, and the alternating current loop has three branches: a controlled alternating current source Ia, a controlled alternating current source Ib and a controlled alternating current source Ic; establishing a control system calculation unit, and calculating each simulation step length. The complex electrical external characteristics of the AC-DC bidirectional converter are simulated by establishing the main circuit model and the control system calculation unit, a converter circuit containing a large number of power electronic devices does not need to be established, the engineering precision requirement is met, and the simulation speed is guaranteed.