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 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 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.