66results about How to "Reliable Calculation Method" patented technology

The invention pertains to airplane fatigue and damage-tolerance testing technologies, and relates to a damage-tolerance testing method for the whole wing spar of an airplane. The method comprises the steps of: (I) choosing a part with large load from the whole wing spar for serving as a testing part examining segment, (II) producing two same testing parts according to the examining segment, (III) reserving an interval of 20 to 30mm between the two back-to-back testing parts which are respectively provided with a coating in the upper part and the lower part (the coating is connected with an upper spar edge strip and a lower spar edge strip to form a case segment), (IV) fixing the root of the testing case segment completing assembly on a load-bearing wall, (V) exerting concentrated load at one end of the testing parts to simulate the bending moment of the spar at the testing segment and the shearing force of a web, without considering the influence of the shearing flow of the coating and (VI) using a finite element method to conduct damage tolerance analysis on the testing parts and comparing testing results. The method solves the difficulty that the crack expansion and remaining strength of the present airplane whole wing spar structure lack theoretical evidence; and the design of the testing parts adopts a method of simultaneously conducting tests to the two back-to-back testing parts, thereby eliminating the distortion of a single spar.

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 belongs to the technical field of oilfield exploitation and discloses an underground spiral flow tubular column for separately exploiting gas and liquid and a system analysis method. Byutilizing a suspended speed oil tube in an oil tube, a gas-liquid lifting channel is built; by setting a split ratio, after gas and liquid flow through a spiral flow gas-liquid separator, the gas production amount and exit pressure of a gas-phase outlet and the liquid production amount, gas content rate and exit pressure of a liquid-phase outlet are calculated separately; pressure loss and critical liquid-gas loading amount after the gas passes through a gas nozzle are figured out through iterative computation to judge whether or not the speed oil tube meets the requirements for loading liquid. By setting electric pump feature parameters, pump discharge pressure and the annulus pressure loss of an on-way oil tube and the speed oil tube are figured out through the iterative computation until the pressure of an inlet of a gas-liquid mixing device is approachable to the pump discharge pressure; finally, the pressure loss between the on-way oil tube and a wellhead is figured out through the iterative computation until oil pressure is higher than flow backpressure. The technological tubular column has the advantages that convenience is provided for operation and construction, and the working stability is high. The system analysis method of the tubular column is clear in thinking pattern, reliable in computing approach and simple in system coordination control and can be widely applied to hoisting processes for marine oil wells with a high gas-liquid ratio.

The present invention discloses an alarm system normal and abnormal data detection method and apparatus based on mean change detection. The method comprises the following steps: obtaining a process signal, and calculating a test statistic of the continuous monotonically varying cumulative sample number of the signal; obtaining the time corresponding to the maximum value of the test statistic, and verifying whether the time is the process signal mean change time by using the hypothesis test method; using the dichotomy to identify whether all process signals are mean change signals, and recording all the mean change signals; according to the chronological order, dividing the process signal into a plurality of sub-segments with the mean change signals as the beginning and the end, and using the T test method to determine whether each of the sub-segment is the normal data segment or the abnormal data segment; and for the single analog quantity and alarm delay alarm system, obtaining the normal data and the abnormal data, so as to provide the basis for the calculation and optimization of the performance index of the alarm system, improve the performance of the alarm system, and ensure the safe production and efficient operation of the coal-fired generating units.

The invention relates to a calculation method for vibration absorber isodesmic annular superposed valve plate deformation and belongs to the technical field of vibration absorbers. At present, no reliable calculation method is provided for the vibration absorber isodesmic annular superposed valve plate deformation; and most methods are used for entity modeling and simulation by using ANSYS and cannot meet requirements on vibration absorber design and characteristic simulation and superposed valve plate design. The calculation method is characterized in that deformation of annular superposed valve plates, which has the same material characteristics and of which the radiuses of an inner circle and an outer circle are equal, at positions with any radius r and any valve port radius rk is precisely calculated. According to an ANSYS simulation result, the calculation method is precise; and the calculation method for the vibration absorber isodesmic annular superposed valve plate deformation is supplied to vibration absorber characteristic simulation and splitting design of a superposed valve plate.

The invention belongs to the field of basic physical property testing of unconventional oil and gas reservoir engineering and geotechnical engineering and particularly relates to a fractal dimension measuring and calculating method for effective pores of hydrate-containing sediments. Firstly, X-CT gray images of the hydrate-containing sediments are acquired and the porosity is measured; then, thegray images are colored again, X-CT colored images of the hydrate-containing sediments are acquired from two groups with gray values of soil particles, hydrate particles, gas and moisture in obvious comparison, then, X-CT colored images with set thresholds are subjected to binarization processing, black and white images are obtained, the effective porosity of the acquired black and white images isthe same as that of the X-CT gray images, and white and black represent a framework material and a pore fluid respectively. The fractal dimensions of black areas in the black and white images, namely, the fractal dimensions of effective porosity of the hydrate-containing sediments, are solved. The problems that solid framework space and pore fluid space cannot be segmented effectively with existing methods are solved, and the fractal dimensions of effective porosity of the hydrate-containing sediments can be measured and calculated accurately.

The invention provides a widespread fatigue damage analysis method of a fuselage wallboard lap joint structure, which makes a new request according to conventional widespread fatigue damage assessment. The analysis of the fuselage wallboard lap joint structure comprises three aspects: firstly, a detail fatigue analysis of a row of rivet holes of the lap joint structure is conducted based on a fatigue lifetime analysis; secondly, a damage tolerance analysis of any of the row of rivet holes of the lap joint structure is conducted; and thirdly, when the row of rivet holes of the lap joint structure have leading cracks, it is considered that all hole edges have initial damages of material defect, it is assumed that the initial damage dimension is 0.127 mm, crack expansion of the structure is performed, and the residual intensity is calculated so that the inspection interval requirement is satisfied. According to the method, the application space is wide in the initial stage and later stage of the design of civil airplanes, the accuracy and the reliability of analysis can be greatly improved, the structural service security can be guaranteed from the perspective of durability, and the expansibility is achieved with the expansion of a test database.

The invention belongs to the technical field of new energy power generation, and particularly relates to a reactive power optimization system and method for control over voltage fluctuation in a wind power centralized output mode. The reactive power optimization system comprises a real-time data acquisition system, control unit control modules of a wind power plant, a voltage fluctuation optimization control module, a reactive power compensation optimal allocation module, a control instruction sending interface, an executive module, a data response feedback control module, a reactive power and voltage sensitivity analysis module, a Digsilent calculation module, a voltage adjustment module and another data response feedback control module. According to the reactive power optimization system and method for control over voltage fluctuation in the wind power centralized output mode, a dynamic reactive power allocation principle targeted at voltage can be used for guiding a dynamic reactive power allocation principle in the wind power centralized output mode, the increasingly serious problem of drastic voltage fluctuation caused by wind power centralized output can be solved, and an accurate and reliable calculation method is provided for reactive power optimization in the centralized compensation process during centralized output. Accordingly, the reactive power optimization system has great significance in improving the safety and economical efficiency of electric power system operation.

The invention relates to a method for calculating the composite stress of non-equal structure superposed valve plates of a vehicle shock absorber and belongs to the technical field of the shock absorber. The method is characterized in that according to the inner radius, outer radius, thickness and number of the non-equal structure superposed valve plates, the outer radius unequal rate factor, the equivalent thickness, the equal thickness, and the thickness proportionality factor of each superposed valve plate are determined; according to structure parameters and material characteristic parameters, the composite stress factor of the non-equal structure superposed valve plates is calculated, so that the composite stress of each non-equal structure superposed valve plate at any radius under uniform pressure is calculated. Comparison with an ANSYS simulation verification result shows that the calculating method is correct, a reliable composite stress calculating method is provided to the detaching design and strength verification of the non-equal structure superposed valve plates of the vehicle shock absorber, the design level, the quality and the performance of the shock absorber can be improved, on the premise that characteristic design requirements are met, the design requirement on the stress strength of the valve plates is met, and the design and experiment cost and the production cost are reduced.

The invention discloses a calculating method for the bending strength of a dust-collector-box standing column under the transverse-load effect. Engineering designers can conveniently and accurately calculate the maximum section bending moment of the internal force of the middle standing column when box wall plates suffer from the transverse-load effect according to the formula and related calculation coefficient tables; synergistic work of the wall plates and the standing column are considered, the wall plates in the effective width on the two sides of the standing column serve as extending parts of standing-column flanges to form a compound section, and the compound section and the standing column jointly bear the bending moment; in this way, the standing-column section modulus is multiplied by a correction coefficient gamma, and calculation and analysis of finite elements of multiple embodiments show that the gamma can be valued as 1.06 based on the safety, and therefore checking calculation of the bending strength of the section of the standing column is carried out.

The invention relates to a power system frequency measurement method and system. Firstly, the sampling signals of the power system are subjected to low pass filtering, and the high-frequency interference signals are eliminated; the obtained low-frequency signals are subjected to sinusoidal Fourier calculation, and phasors of three moments with a difference of a 1/m cycle are obtained to eliminatethe influence of low-frequency harmonics, and m is no smaller than 3; and finally, according to a phasor frequency measurement method, the real-time frequency of the power system is obtained. The low-frequency signals of the power system are processed, the sinusoidal Fourier is used to eliminate the influence of low-frequency harmonics, the frequency result of the power system which is obtained through calculation is more accurate, and in comparison with the method used in the prior art, a lot of iteration work is not needed, the calculation method is simple and reliable, popularization is easy, and the practical application value is strong.

The invention relates to a method for calculating stress of each leaf of end contact-type main and auxiliary taper-leaf parabolic springs and belongs to the technical field of suspension steel plate springs. Stress of each leaf of main springs and auxiliary springs at different positions is calculated analytically according to structural parameters, elasticity modulus, auxiliary spring active load and main spring load of each leaf of main springs and auxiliary springs of end contact-type main and auxiliary taper-leaf parabolic springs; According to examples and simulation verification, by means of the method, accurate and reliable stress calculated values of main springs and auxiliary springs at any position can be obtained; reliable method is provided for calculating stress calculated values of main springs and auxiliary springs of end contact-type main and auxiliary taper-leaf parabolic springs at any position; product design level, performance, service life, and vehicle ride performance are increased; at the same time, cost for design and test is reduced, and product development speed is increased.

The invention discloses a substrate load calculation method suitable for crossing a composite stratum tunnel. The invention belongs to the technical field of tunnel construction, and relates to a composite stratum tunnel foundation load calculation method, which belongs to the technical field of tunnel construction and can accurately and quickly determine the width of a sliding area in a hard soillayer according to the position relation between boundary lines of soft and hard soil layers of a composite stratum and a tunnel center line by establishing a sliding line field mechanical model between the composite stratum tunnel and the composite stratum to realize calculation of the composite stratum tunnel foundation load. Deduction process is simple. The calculation of the substrate load when the tunnel structure crosses the composite stratum can be effectively realized. The method has the advantages that the calculation result of the tunnel base load is closer to the actual measurementvalue, the actual stress state of the tunnel in the composite stratum is met, an accurate and reliable calculation method is provided for the base load when the tunnel crosses the composite stratum to ensure construction and operation safety of the tunnel. The method is high in scientificity and good in application prospect and popularization value.

The invention relates to a method for determining carbonate reservoir saturability. The method for determining the carbonate reservoir saturability is applied to the determination of heterogeneous carbonate reservoir water saturability. Firstly, a carbonate reservoir saturability capillary tube pressure function is established, standardization is performed on the carbonate reservoir oil-water transition zone electric-log interpretation water phase saturability of each oil well, then polynomial regression is performed with the capillary tube pressure J function, and an iteration method is used to determine the carbonate reservoir saturability. The method for determining the carbonate reservoir saturability has the advantage that a reasonable and reliable calculation method is provided for the calculation of the heterogeneous carbonate reservoir water saturability lack of core data.

The invention discloses a big data asset value evaluation system and method. The system comprises a data asset value evaluation parameter confirmation unit, a data asset value evaluation index unit, a data asset value evaluation index weight setting unit, a data asset value evaluation unit, a data asset value result identification unit and a data asset value evaluation result application unit. The invention has the beneficial effects that the difficulty that the enterprise big data asset value is difficult to quantitatively evaluate is solved, the data asset value evaluation result is identified and used, and the improvement of the return on investment is promoted.

The present invention relates to an analysis model, and particularly, to an analysis model and calculation method for anti-side bearing capacity of an anti-buckling steel plate shear wall, and belongs to the field of steel structures. The steps are as follows: putting forward a stress assumption of a shear stress field of an anti-buckling steel plate shear wall; according to an experiment and numerical simulation analysis, putting forward a stress assumption of a shear stress field of an anti-buckling steel plate wall; and according to an analysis model of bearing capacity of the anti-buckling steel plate shear wall, performing model internal force analysis. Thus, definition is conveniently performed on different connection forms of the anti-buckling steel plate shear wall. A general analysis model of the anti-buckling steel plate shear wall with different pillar connection forms for engineering design of the anti-buckling steel plate shear wall and a theoretical calculation formula of the shear bearing capacity are given, and a reliable and effective calculation method is provided for procedure calculation.

This invention relates to a method for calculating maximum circumferential stress of an annular valve plate with different thicknesses of a hydro-pneumatic spring, and belongs to the technical field of hydro-pneumatic suspension. The method solves the problem that the methods for calculating the maximum circumferential stress of the annular valve plate with different thicknesses of the hydro-pneumatic spring are not reliable in the prior art, and mostly a finite element software is used for simulating the maximum circumferential stress of a given pressure so that the methods cannot meet the requirement of modern CAD (Computer-Aided Design) of the hydro-pneumatic spring. By adopting the method for calculating the maximum circumferential stress of the annular valve plate with different thicknesses of the hydro-pneumatic spring, the maximum circumferential stress can be calculated precisely and quickly according to the structure parameter and the material performance parameter of the annular valve plate with different thicknesses of the hydro-pneumatic spring. Compared with the ANSYS simulation result, the calculating method is precise and reliable; and in order to realize modern CAD design of the hydro-pneumatic spring and calculate the stress intensity of the annular valve plate with different thicknesses, this invention provides the reliable method for calculating the maximum circumferential stress of the annular valve plate with different thicknesses of the hydro-pneumatic spring.

The invention relates to a computing method for combined stress of same-structure annular superposed valve sheets of a shock absorber, and belongs to the technical field of hydraulic shock absorbers. The computing method is characterized by comprising the following steps: (1) confirming the equivalent thickness of the same-structure annular superposed valve sheets; (2) confirming the thickness proportionality factor of the same-structure annular superposed valve sheets; (3) computing the combined stress factor at any radius r of the same-structure annular superposed valve sheets; and (4) computing the combined valve sheet stress at any radius r of the superposed valve sheets and the maximum combined stress at the inner circle radius. With adoption of the computing method, the combined stress at any radius can be accurately computed according to the thickness and the number of the same-structure annular superposed valve sheets as well as the stress borne by the same-structure annular superposed valve sheets. As proved by ANSYS simulation verification results, the computing method for the combined stress of the same-structure annular superposed valve sheets is accurate, and the reliable computing method for the combined stress of the same-structure annular superposed valve sheets is provided for splitting design and stress intensity check of superposed valve sheets actually.

The invention relates to a method for calculating the maximum radial stress of an unequal-thickness annular valve slice of a hydro-pneumatic spring and belongs to the technical field of hydro-pneumatic suspensions. Previously, no reliable calculation method has been developed for the maximum radial stress of the unequal-thickness annular valve slice of the hydro-pneumatic spring, and generally, finite element software is utilized to simulate the maximum radial stress under a given pressure, which fails in meeting the requirements of modern CAD deign of the hydro-pneumatic spring. The method for calculating the maximum radial stress of the unequal-thickness annular valve slice of the hydro-pneumatic spring is capable of realizing accurate and fast calculation of the maximum radial stress of the unequal-thickness annular valve slice according to the structural parameters and material property parameters of the unequal-thickness annular valve slice of the hydro-pneumatic spring. Compared with an ANSYS simulation result, the calculation method is accurate and reliable; as a result, a reliable maximum radial stress calculation method is provided for realizing the modern CAD design of the hydro-pneumatic spring and the stress strength calculation of the unequal-thickness annular valve slice.

The present invention provides a calculation method for stress of each leaf of a non-end-contact few-leaf end-enhanced main spring and sub-spring, and belongs to the technical field of suspension leaf springs. According to the method provided by the present invention, stress of each leaf of main spring and sub-spring of a non-end-contact few-leaf end-enhanced main spring and sub-spring at different positions can be calculated according to a structure parameter of each leaf of the main spring and sub-spring, an elastic modulus, a load that makes the sub-spring function, and a load that the main spring bears. It can known by means of instances and ANSYS simulation verification that stress calculated values of each leaf of the main spring and sub-spring of the non-end-contact few-leaf end-enhanced main spring and sub-spring at the different positions can be accurately and reliably obtained according to the method, and by using the method, the design level, product quality, performance and reliability of a non-end-contact few-leaf end-enhanced tapered main-spring and sub-spring are improved, and smoothness and safety of vehicle driving are improved, the quality and cost of a suspension spring are reduced, and product design and experiment expenses are lowered, and product development and design speed is increased.

The invention relates to a calculation method for deformation of an annular elastic valve plate of a shock absorber. The calculation method is characterized in that the method comprises the steps of 1) determining constant terms formed by valve plate deformation coefficients; 2) calculating a valve plate deformation coefficient Gr at any position with radius r; and 3) calculating valve plate deformation fr at any position with radius r. The calculation method for the deformation of the annular elastic valve plate of the shock absorber provided by the invention uses a valve plate mechanical model under uniform pressure, gives out the deformation coefficient Gr at any position with radius r of the valve plate according to the inner radius, the outer radius, the elastic model and the Poisson ratio of the annular elastic valve plate, and can accurately calculate the deformation of any position with radius r of the valve plate by using the deformation coefficient of the position with radius r of the valve plate. By making a comparison with an ANSYS simulation verification result, the method is accurate and reliable and an accurate and reliable valve plate deformation calculation method is provided for the modern CAD (Computer-Aided Design) design and property simulation of the shock absorber.

The invention discloses a measurement method and device for downhole triangulated height through front-back simultaneous front and rear visions. A total station is erected below a roadway control point, and a purpose of high precision measurement of height difference between control points is achieved by combining an inverted prism device through a method for observing other controls points through front and rear visions. Different from the traditional triangulated height measurement method, the instrument height and the prism height can be eliminated through a calculation method disclosed bythe invention, an operation of measuring the instrument height and the prism height ais unnecessary in an actual measurement process, and the placement of the prism is free from centering and leveling, the speed of the downhole triangulated height measurement is improved, the influence of the measurement error of the instrument height and the prism height is reduced, and the precision and the efficiency of the downhole triangulated height measurement are improved. The measurement method disclosed by the invention can be used for downhole roadway measurement work, the operation method is simpleand practical, the designed inverted prism device is compact and reasonable in structure, and extensive in practicability.