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

The invention relates to a motion mechanism of a blast furnace top maintaining robot, comprising a support frame which is fixedly connected with the blast furnace top manhole and is positioned in thecavity of the blast furnace top. The support frame is provided with a rotary table, of which the rotary center is positioned in the center of the blast furnace top. The rotary table is provided with alifting platform in which a telescopic boom is arranged. The structure well realizes a three degrees motion of the structure. With simple structure, good rigidity, the motion mechanism of the blast furnace top maintaining robot can automatically and precisely control the moving position and meet the operation requirement of the industry robot.

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 aircraft vibration fault database construction and retrieval method based on the perceptual hash algorithm, including reading test data, filtering, resampling, wavelet transform, transforming the time-frequency domain data matrix into a grayscale image; through the hash algorithm, the grayscale image Map to a new fixed-size grayscale image; perform secondary mapping on the mapped grayscale image and convert it into a binary image; rearrange the elements in the binary image matrix to generate a hash value; convert the generated hash Values ​​are compared with the hash values ​​in the database one by one, and the coherence coefficient is calculated: then the fault analysis and pre-judgment are carried out. The invention summarizes the civil aircraft vibration fault data and experience, builds a civil aircraft vibration fault database, and directly analyzes the collected complete The time-domain vibration data is processed and compared with the data in the database, which can quickly locate the fault type, meet the accuracy of engineering use, and the engineering is safe and reliable, suitable for popularization and promotion.

The invention relates to an intelligent killing method and device for a complex pressure system formation, including: (1) real-time monitoring of the real-time information of the downhole-surface; (2) processing the real-time information of the downhole-surface, judging the downhole working condition, and if the When the downhole is abnormal, on the one hand, the uncertain parameters in the wellbore multiphase flow model are inverted in real time, and on the other hand, the wellbore pressure distribution is dynamically simulated and calculated; (3) the control signal is issued, and the throttling control parameters are intelligently optimized and designed, including the connection of the throttling valve. The method and pressure drop distribution plan can adjust the wellhead pressure in real time to maintain the bottom hole pressure constant, and at the same time, track the vertical pressure feedback of casing pressure, and intelligently optimize and adjust the well killing control plan through the feedback structure. The invention can automatically monitor the downhole working conditions in the whole process and in real time, and intelligently invert the formation pressure information according to the change trend of the measurement information, so as to achieve the purpose of abnormally accurate downhole, timely monitoring, and intelligent identification of formation information of a complex pressure system.

The invention provides a method for simulating an energy storage type regenerative energy absorbing device suitable for power flow simulation calculation, comprising the following steps: establishing a main circuit model, which is formed by connecting two branches in parallel, one of which is composed of a switching element K 1 , resistance element R , controlled voltage source U sc Formed in series, branch two consists of switching elements K 2 , controlled current source I sc Formed in series; establish the calculation unit of the control system, which is based on the constant parameters set before the simulation and the DC grid side voltage of the main circuit model collected in the simulation u dc , DC grid side input current i dc , and the control signal output by the calculation unit of the control system at the last simulation step soc , for each simulation step calculation. The invention simulates the complex electrical external characteristics of the energy storage type regenerative energy absorbing device by establishing a general-purpose main circuit model and a control system calculation unit, without building a converter circuit containing a large number of power electronic devices, which not only meets the engineering accuracy requirements, The simulation speed is also guaranteed.

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 present disclosure relates to a method for calculating the distance between the rear of a vehicle and a parked vehicle in a shunting top-feed operation, wherein the shunting top-feed operation system includes shunting group members, shunting positioning equipment, an intelligent shunting server, and a laser emission Devices, locomotives. The shunting positioning equipment includes a shunting handheld station, a laser receiving device, and a retractable rod. The shunting handheld station includes a GPS positioning module; the locomotive includes a locomotive controller, a locomotive GPS positioning module, and a laser range finder. When the parking vehicle is located in a closed parking lot, the GPS positioning accuracy decreases. By enabling the laser positioning system, the GPS positioning information is corrected and the positioning accuracy of the parking vehicle is improved. Further, considering that the interference of the laser range finder is relatively large, the laser range finder is only activated after it is determined that the rear of the vehicle enters the straight segment and the distance between the rear of the vehicle and the parked vehicle is less than the threshold value, thereby greatly improving the accuracy of the laser ranging, and then Realize the precise control of the deceleration of the vehicle during the roof transfer operation.

The invention belongs to the technical field of steel structures and in particular relates to a net rack node location adjusting device and location adjusting method. The net rack node location adjusting device comprises a bottom plate, a central round hole is formed in the bottom plate, a supporting tube is fixedly arranged on the bottom plate, an adjustable carrier tube is in threaded connection in the supporting tube, the adjustable carrier tube can move up and down relative to the supporting tube, a cross locating plate is arranged at the upper end face of the adjustable carrier tube, and the vertical downward projection of the center of the cross locating plate coincides with the central round hole of the bottom plate. When the net rack node location adjusting device is used for carrying out spherical node location, a coordinate converting method is utilized, and accurate location of spherical nodes can be achieved by measuring the coordinates of the central point of the cross locating plate. The net rack node location adjusting device and location adjusting method are convenient and effective for location and installation of the spherical nodes of net rack structures.

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 relates to a graph-based detection method of a multi-pump confluence flow pulsation characteristic. The graph-based detection method comprises the steps that 1, according to a type of apump, an instantaneous flow function and an average flow when each pump works independently are obtained by using a pump flow theoretical model or a flow pulsation experimental result; 2, a pump angleis arbitrarily chosen as a foundation rotation angle, and the rotation angle phase difference random characteristic and the foundation rotation angle range between other pumps and the pump are determined; 3, the instantaneous flow function and the average flow are calculated when the multiple pumps work together; 4, a multivariate function relationship between the confluence flow pulsation rate and each rotation angle phase difference is determined by calculating and is represented graphically; and 5, a graph in the step 4 is used for calculating probability corresponding to the confluence flow pulsation rate in the pulsation rate range. Compared with the prior art, the graph-based detection method is convenient in calculation and can meet requirements of engineering accuracy, and can provide theoretical basis for designing the multi-pump system, suppressing system flow pulsation, and reducing noise and vibration.

The invention relates to a modeling method of a mathematical model for silicon solar cell engineering, which is used for modeling according to the characteristic of large similarity of an I-V characteristic curve of a silicon solar cell and a particle-throwing motion locus curve. In the coordinate system of the particle-throwing motion locus curve, the coordinate system is divided into different gravitational fields by two demarcation points at a maximum-power point voltage position and a voltage position lower than the maximum power point, and then deducing and modeling are carried out according to the principle of kinematics. The invention not only can still meet the requirement of engineering precision well; through adjusting the position of the demarcation point in the voltage position lower than the maximum power point, the model of the invention can be close to actual measurement data in a zone nearby the maximum-power point voltage position well so as to be beneficial to the realization of a maximum power tracking algorithm; and the invention can also greatly improve the response speed of control units in controllers along with the changes of external environments comprising illumination, temperature and the like. When the model is calculated and controlled by adopting controllers comprising a single-chip machine or a DSP (Digital Signal Processor) and the like in engineering practice, the operating time of the model is greatly shortened.

The invention discloses a photovoltaic cell output characteristic modeling method based on a Bezier function. The method comprises the steps of S1, establishing a rectangular plane coordinate system, determining the positions of a short-circuit current point, a maximum power point and an open-circuit voltage point in the rectangular plane coordinate system, and determining the positions of two control points of the Bezier function in the rectangular plane coordinate system according to the positions of the short-circuit current point, the maximum power point and the open-circuit voltage point; S2, determining the coordinates of points, located on the left side and right side of the maximum power point, on the Bezier function curve according to the positions of the short-circuit current point, the maximum power point, the open-circuit voltage point and the two control points; S3, drawing a Bezier fitted curve. According to the method, photovoltaic cell output characteristic modeling can be achieved simply based on the parameters including short-circuit current, maximum power point and open-circuit voltage given by a manufacturer by means of the piecewise second-order Bezier function.