46results about How to "Good calculation stability" patented technology

A method for re-establishing a moving sound source by adopting a moving equivalent source method is characterized in that the method comprises the following steps of measuring Doppler effect-contained sound pressure data in a moving sound source radiation sound field; establishing a transmission relationship between vibration speed and radiation sound pressure under Doppler effect-contained measured sound pressure and sound source static situation by the moving equivalent source; removing the influence of the Doppler effect according to the transmission relationship; and realizing the positioning identification and sound field re-establishment of the moving sound source. The moving sound source applicable to the method can be any shapes including plane, cylindrical surface or spherical surface; and the method is developed on the basis of a near-field acoustical holography reconstruction algorithm based on the equivalent source, has good computation stability, high computation precision and simple execution.

The invention provides an oil and gas reservoir numerical simulation calculation method. The method includes calculating oil phase pressure, water phase pressure and gas phase pressure of a spatial dispersion post simulation process at any moment, calculating total volume flow of fluid in the flowing direction according to the oil phase pressure, water phase pressure and gas phase pressure of the spatial dispersion post simulation process at any moment, calculating oil saturation, gas saturation and water saturation according to the total volume flow of the fluid in the flowing direction and correcting the oil saturation, the gas saturation and the water saturation according to the substance conservation principle. In the method, the pressure is calculated in one step, the speed is calculated in one step, and branch flow and saturation are calculated in multiple steps, velocity item calculation is introduced, and calculation misconvergence caused by factors such as anisotropy, fluid phase change and unreasonable production systems is avoided. The numerical simulation stability is better, the convergence condition is easy to judge, and the method is suitable to be applied when a common oil and gas reservoir numerical simulation method sinks into misconvergence.

The invention discloses a method for reestablishing a transient sound field. The method is characterized by comprising the following steps of: setting a holographic surface H in a sound field to be measured, and uniformly distributing M measuring points on the holographic surface H; synchronously measuring sound pressure signals of the M measuring points positioned on the holographic surface H to obtain the time domain sound pressure of the M measuring points by adopting M microphones; setting a virtual source surface S<*> within a sound source surface S, and distributing N time domain equivalent sources on the virtual source surface S<*>; carrying out interpolation processing on the time domain sound pressure of the M measuring points by adopting linear interpolation functions, and establishing the transitive relation between the time domain sound pressure of the M measuring points positioned on the holographic surface H and M time domain equivalent sources at any time; starting to sequentially acquiring the source intensity of the time domain equivalent sources at corresponding times from an initial time; and reestablishing the time domain sound pressure of any field point according to the acquired source intensity of the time domain equivalent sources at all times and the transitive relation between the time domain equivalent sources and any field point. The method disclosed by the invention has the advantages of good computational stability, high accuracy, high speed and easiness for implementation and is especially suitable for reestablishing the transient sound field generated under the action of transient exciting force.

The invention discloses an evaluation method of a part flatness error based on a minimum area method. The evaluation method comprises the steps of measuring and obtaining coordinates of measuring points on a measured plane, giving an initial parameter of the plane, enquiring the measuring points contacted with an error containing area according to the distances from the points to the plane, projecting the measuring points into a designated plane and converting into straightness error calculation in the designated plane by a coordinate system transformation method according to the quantity and the relative positions of the contact points, searching the measuring points contacted with the containing area and satisfying a straightness error discretion rule through the rotation change of the containing area in the projection plane, obtaining a rotated containing area, redefining a projection plane, conducting iterative calculation sequentially according to the straightness error calculation till a flatness discretion rule is satisfied, and outputting the flatness error and an optimal value corresponding to an ideal plane parameter. With the adoption of the evaluation method, the flatness error satisfying a minimum area discretion rule can be accurately calculated.

The invention provides a method for calculating temperature, pressure and dryness of an injected steam and nitrogen mixture. The method comprises the steps as follows: calculating initial temperature, initial gaseous dryness and initial steam dryness of a mixture after steam is mixed with nitrogen; calculating wellhead temperature, wellhead pressure and wellhead dryness distribution of a surface pipeline wellhead with randomly set step length by using the outlet of a steam boiler as an initial calculating point; calculating wellbore temperature, wellbore pressure and wellbore dryness distribution with randomly set step length by using the wellhead as an initial calculating point; and providing guidance for the implementation of the corresponding technology in an oil field site based on the wellbore temperature, the wellbore pressure and the wellbore dryness distribution. The method of the invention has excellent computational stability and higher computational accuracy, and provides reliable calculation means for optimal design of wellbore injecting parameters of a stream and nitrogen mixed system.

The present invention discloses a lake three-dimensional water power-water temperature-water quality simulation and prediction method based on a splitting algorithm. A lake three-dimensional water power-water temperature-water quality model is constructed, a lake is dispersed into a plurality of grid units, variables are arranged for grids in an Arakawa C mode, each operator in the lake three-dimensional water power-water temperature-water quality model is classified according to wave frequency rapid and slow features of the physical fluctuation process of the operator on the basis of the splitting algorithm, the low-frequency slow process operators are subjected to explicit processing, the high-frequency rapid process operators are subjected to implicit processing, and the model is discretely solved step by step by adopting the splitting algorithm so as to obtain three-dimensional flow fields, water temperatures and water quality index concentrations at different positions in a lake water area and at different time. The lake three-dimensional water power-water temperature-water quality simulation and prediction method based on the splitting algorithm, which is disclosed by the present invention, can more accurately reflect the complex physical processes of momentum migration, heat transfer, pollutant transportation and the like in lake water and has the characteristics of high calculation stability, high calculation accuracy and high calculation efficiency.

A symmetry error evaluation method based on a minimum zone is mainly used for evaluating symmetry errors with a line serving as a reference. The method comprises the steps of first measuring and obtaining measured characteristics and coordinates of measured points on a reference line; performing fitting of a reference straight line through a minimum zone method, enabling a direction vector of the reference line corresponding to ideal characteristics to be parallel to a z-axis by coordinate system transformation, enabling the measured characteristics to be projected in an xoy plane, dividing an evaluated zone into a plurality of zones, and calculating an optimal value of a measured characteristic parameter and a corresponding symmetry error value through a method of respectively calculating corresponding error values in the zones. According to the symmetry error evaluation method, a symmetry error meeting the minimum zone and the optimal value of the measured characteristic parameter can be worked out accurately.

The invention discloses a thermochemical unbalanced multistage gas model adaptive algorithm which is mainly used for a numerical simulation process of hypersonic thermochemical unbalanced flow. According to the algorithm, on the basis of thermochemical unbalance characteristics such as thermodynamic modal excitation, dissociation/ionization of high-temperature gas, a segmented gradual approximation simulation strategy from simple to complex is adopted from a physical mechanism, and evolution and step-by-step flow simulation of a calculation gas model are automatically completed according to criteria such as pressure, dissociation degree, temperature and ionization degree; and a self-adaptive simulation process of hypersonic thermochemical unbalanced flow is realized. The algorithm is suitable for various calculation media such as the earth atmosphere, the Mars atmosphere and high-temperature fuel gas, the application range is wide, the calculation stability is good, and the convergence speed can be increased and the calculation efficiency can be greatly improved on the premise that the calculation accuracy is guaranteed.

The invention provides a method and a device for determining a temperature field of a hollow sucker rod hot water injection circulation wellbore. The method divides the wellbore into several sectionsand calculates the physical parameters of the corresponding sections. The temperature field distribution of hot water injection into the hollow sucker rod in the wellbore tubing is calculated by iterative method. The calculation method disclosed by the invention has good calculation stability and high calculation accuracy, and can be used for predicting the displacement and temperature of hot water mixed into the wellhead of the double-layer hollow sucker rod hot water circulating heating viscosity reduction process by the algorithm and the interpretation tool, thus achieving the purpose of viscosity reduction of the wellbore crude oil.

The invention discloses a rapid optimization design method applied to a millimeter wave extended interaction oscillator, and relates to the technical field of microwave, millimeter wave and terahertzelectric vacuum devices. According to the method, simulation-numerical value-simulation repeated iterative optimization is adopted, nonlinear numerical value calculation is matched into multi-parameter optimization, and the optimization target of the highest interaction efficiency is achieved more quickly; describing the relationship between the amplitude distribution of each gap electric field ofthe optimal interaction high-frequency structure in a unified expression form according to theoretical analysis and optimization calculation results; then, according to the proposed electric field expression form, the optimization of the high-latitude dimension is greatly reduced, the variation range of optimization parameters is reduced, and finally, the optimization time is greatly shortened and the optimization result is improved; moreover, compared with a nonlinear numerical calculation program for calculating by a time step length, the nonlinear self-consistent solution of the injection-wave interaction of the space step length and the simulated annealing algorithm optimization method are adopted for calculation, so that the numerical calculation process is quicker, and the result ismore stable.

The invention discloses a computing method of function sizes of a benchmark constrained cylinder. The computing method of the function sizes of the benchmark constrained cylinder comprises measuring and obtaining coordinates of measuring points which are arranged on a cylinder to be measured and a benchmark; fitting the benchmark based on a minimum area to provide a primary parameter of the cylinder to be measured, projecting the measuring points in a plane which is perpendicular to an axis of the cylinder to be measured and fitting the projecting points through a method of computing a function surface of a circle; inquiring a measuring point the cylinder to be measured and the function surface are in contact with and performing corresponding rotating change or size change on the function surface according to coordinates of a contact point; and inquiring the contact point to perform change of the function surface, sequentially performing iterative computations until a discriminate criterion is satisfied and outputting a parameter of the cylinder to be measured.

The invention discloses an inverse kinematic solving method based on a neural network. The inverse kinematic solving method based on the neural network mainly solves the problems that in the prior art, in the process of inverse kinematic solving, value calculation time is long, convergence is difficult to guarantee, and a computation result is single. The inverse kinematic solving method based on the neural network comprises the following steps that the equivalent optimization problem expression of an inverse kinematic problem is worked out; a recurrent neural network solving model for an optimization problem is established, and a kinematic solving variance of the optimization problem is set; model parameters for guaranteeing the convergence of the solving model are set; the initial value disturbance of a system state is set, and the variety of a movement trace line is solved. By the adoption of the scheme, the inverse kinematic solving method based on the neural network achieves the purposes that the technical speed of the model is effectively controlled, the demand for three-dimensional rendering application is met, and the calculation stability is good, and has high practical value and popularization value.

A method for calculating part conicity based on a minimum zone comprises the steps of firstly measuring and obtaining coordinates of measured points on the measured circular conical surface, then providing initial parameters of a cone, inquiring measured points of measured features in contact with an error tolerance zone, performing corresponding translation change, rotation change and size change of the error tolerance zone according to the number and coordinates of contact points, and calculating the change amount of the tolerance zone to sequentially find contact points meeting criterions of the minimum zone. By means of the method, a conicity error optimal value and a cone parameter optimal value can be accurately calculated.

The invention provides a calculation method of function sizes of part hole series. The method comprises the steps of measuring and obtaining measuring point coordinates on various measured holes, obtaining ideal positions of the holes according to drawing information, converting into a function size of a circle for calculation through coordinate translation, applying a method for solving a nonlinear equation system, changing the diameter of a function surface continuously till a criterion is met, and outputting the function sizes of the hole series and position coordinates of the holes. The method can accurately calculate optimal criterion meeting values of the function sizes of the hole series and the position coordinates of the holes.

The invention provides a method for constructing a combined constraint containing an additional dummy and a drive in a multi-body dynamics model. According to the method, a point-line higher pair constraint of a matt element and a convergence skeleton midplane curve is added; driving of the dumb element is realized by means of online constraint of the A8 roller on the dumb element; meanwhile, according to the geometric dimension of the mechanism, a normal direction angle of a tangent point of an A8 roller and a convergence framework midplane curve is analyzed and expressed by using an A8 ringstroke; the A8 roller is driven according to the angle value; the dummy element is always positioned at the tangent point of the A8 roller and the skeleton midplane curve; meanwhile, bidirectional limiting force in the direction of a roller shaft is added between the A8 roller and the dummy element to prevent the A8 ring from rotating at a large angle; according to the method, over-constraint generated by linear higher pair constraint can be effectively eliminated, simulation application shows that the method can give consideration to fidelity of motion, loading and force transmission characteristics under the condition that simulation stability is guaranteed, and result deviation caused by automatic over-constraint elimination is effectively avoided.

The invention relates to the technical field of processing devices, and discloses an efficient big data processing device which comprises a computer, a fixing plate is fixedly connected to the top ofthe computer, supporting plates are fixedly connected to the two sides of the computer, the tops of the two supporting plates are fixedly connected to the fixing plate, and the fixing plate and the supporting plates are jointly connected with an adsorption mechanism. The adsorption mechanism comprises a connecting groove, two fixing grooves, two tension springs, two pistons, two negative pressurechannels, two fixing rods and two moving blocks; the connecting groove is formed in the end, away from the computer, of the fixing plate, the two fixing grooves are symmetrically formed in the groovewalls of the two sides of the connecting groove, and the two negative pressure channels are formed in the corresponding supporting plates respectively. According to the invention, the computer can beadsorbed on a desktop by using negative pressure, so that the computer is not easy to slide and move, the transmission line is not damaged by pulling, the economic loss is avoided, the transmission line is not easy to fall off from the computer, and the big data calculation stability is good.