408results about How to "Improve engineering applicability" patented technology

The invention discloses an outlier detection-based real-time anti-power-theft monitoring method for a power utilization information acquisition system. The method comprises the steps of calculating line loss of each zone area according to acquired power data of each zone area, and preliminarily judging whether a zone area in an abnormal power utilization state exists or not; if the line loss of certain zone areas is abnormal, collecting power utilization data of the corresponding zone areas, wherein the power utilization data includes user real-time power utilization data and abnormal event data; selecting reasonable evaluation indexes and building a comprehensive power theft suspicion analysis model in combination with methods of outlier detection, data statistics and the like; and taking data collected by a main station as an input of the model, processing user data through the analysis model and obtaining a user power theft suspicion coefficient, thereby locating a suspected power theft user. According to the method, the deficiency of only manual analysis of massive data is overcome, and the efficiency of an algorithm and the reference value of a detection result are improved.

The invention provides a station area electricity utilization monitoring method based on bad electric quantity data identification. The station area electricity utilization monitoring method based on bad electric quantity data identification comprises the following steps of: calculating a line loss rate according to the acquired meter-reading electric quantity data of a station area during a time period, and initially judging whether an abnormal electricity utilization phenomenon exists or not; in the case that the abnormal electricity utilization phenomenon is found, turning to a B-spline function identification method, and identifying the line loss rate, and abnormal data in the daily electricity consumption data of each user; and locating suspicious electricity-stealing users by comparing the abnormal time periods corresponding to the line loss rate data of the power grid of the station area and the daily electricity consumption data of each user. The method provided by the invention only needs the meter-reading electric quantity data of the power grid of the station area, as well as is low in requirements on original data, strong in engineering applicability, and easy to be popularized and applied in the existing power grids of station areas in China. The method provided by the invention is adequate in theoretical basis and good in identification effect by identifying and locating the suspicious electricity-stealing users based on a B-spline function.

The invention provides a method for building an alarm association rule mining system based on a maximal frequent item set DM (Data Mining) and the realization of that. Three different mining ways for single equipment, cognate equipment and linked equipment are designed aiming to different types of equipment in a communication network, and according to the mining range, the DM range can be positioned at specific city level or communication equipment manufacturer level; after the mining way is confirmed, the alarm association time window, the sliding step, etc are selected to acquire an alarm affair set assembly; and alarm association result mining is performed by utilizing the maximal frequent item set mining algorism after a user inputs the minimum support, and mining result treatment and display are performed according to different mining ways. Through the mentioned steps, the alarm association rule needed by the user can be found out from plenty of alarm data. The method has broad application prospect and favorable utility value.

The invention provides a wide area load shedding control method for quiescent voltage stabilization considering external power grid equivalence, belonging to the technical field of quiescent voltage stabilization analysis and control of electrical power systems. In the method, by using programs, a computer is used to calculate the Thevenin equivalent circuit of an external power grid, calculate quiescent voltage stability margin of an equivalent system, and solve a minimum load shedding optimization model so as to obtain a wide area load shedding scheme for a local power grid. Under the condition of unknown external power grid information, the method can be used to exactly calculate the quiescent voltage stability margin of the local power grid only relying on internal power grid information, and formulate a reasonable and effective wide area load shedding scheme for the local power grid. The method has the advantages of high calculation accuracy, fast optimization speed, strong engineering applicability and the like. The method provided by the invention is widely applied to the quiescent voltage stabilization wide area load shedding control of the local power grid connected with the external power grid by single points, particularly the quiescent voltage stabilization analysis and control of the local power grid by hierarchical and zoning management and schedule.

The invention discloses a distributed optical fiber test platform for monitoring an earth rock dam seepage condition. The distributed optical fiber test platform comprises a heating system, a seepage system and a DTS system; the distributed optical fiber test platform is a practical platform having strong operability, aimed at dam seepage monitoring and based on construction of a dam seepage monitoring two-field coupling simplified model; with combination of the DTS system, the distributed optical fiber test platform provides a possibility for a practical application of seepage monitoring engineering of a porous medium structural body, such as an earth rock dam and a dyke-dam, and builds a reliable test platform for various related test researches; and the distributed optical fiber test platform has the advantages of wide test range, high precision, simple layout, low monitoring cost, high working efficiency, strong engineering applicability and the like.

The invention discloses a motivation trajectory optimization method of space robot kinetic parameter identification; and the method can realize motivation trajectory optimization of space robot kinetic parameter identification, and can satisfy PE conditions of parameter identification and the mechanical arm joint motion restraint to improve the convergence rate and accuracy of space robot parameter identification. The incomplete characteristics of a free floating space robot determine a parameter identification model regression matrix A (k) to not only include related positions and related speed related to the mechanical arm joint motion trajectory and but also include the position, the gesture, the speed and the angular velocity of a base indirectly related to kinetic parameters to be identified; and the numbers are solved according to a system kinetic model, so that prior information of the kinetic parameters to be identified is used in offline optimization of a motivation trajectory.

The invention discloses an expansion double-electrode direct current transmission system which comprises a rectification convertor station, a rectification side current conversion unit, a three-electrode power transmission circuit, an inversion side current converting unit and an inversion convertor station. When the expansion double-electrode direct current transmission system normally works, the rectification convertor station controls the magnitude of direct currents by controlling the triggering angle of a thyristor and converts the three-phase alternating currents into double-electrode direct currents in a rectification mode; afterwards, the double-electrode direct currents are converted into three-electrode direct currents through current conversion processing, flow through three transmission lines respectively and undergo current conversion reverse processing. The three-electrode currents are converted into the double-electrode direct currents and the direct currents are converted into three-phase alternating currents through the inversion action of an inversion side thyristor converter and a received end alternating current system is filled with the three-phase alternating currents. Thus, power is transmitted from a sending end alternating current system to the received end alternating current system. Thus, the investment cost is much less than that of a three-electrode direct current transmission system, the transmission capacitance is 1.37 times that of a double-electrode system, consumption loss of extra power will not be introduced into a direct current side, good economical efficiency is achieved and engineering application is facilitated.

The invention provides a satellite-based AIS signal intercept and demodulation method and aims to provide a demodulation method which can simplify configuration and complex degree of receiving equipment and can be adapted with large Doppler frequency shift and long signal time delay and realizes relatively low consumed resource amount. The method is realizes through the following steps of directly performing RF AD sampling after amplification filtering is performed on a signal which is received by an antenna; performing two-path digital channelization preprocessing on the AD sampling data in an FPGA, and outputting two paths of baseband IQ data; respectively calculating instantaneous phases of the two paths of baseband IQ data, and performing 1bit differential algorithm processing on the instantaneous phases for obtaining an instantaneous frequency; performing comparison decision on a buffered instantaneous frequency value f(n) with a frequency central value, and performing correlation operation on a decision result and a standard synchronous sequence; on the condition that a correlation operation value exceeds a threshold and reaches a highest value, determining demodulation bit synchronization and finding out an optimal sampling point for demodulation; detecting a signal end mark in the demodulation process, and outputting all demodulation results on the condition that the end mark occurs.

The invention discloses a structure and a method for detecting a post-grouting sleeve-type bar splice by an external vibration test method. The structure comprises an upper member embedded bar, a lower member embedded bar, a grouting sleeve and a detection device, wherein a first drill hole and a second drill hole are formed in a wall body, and the two drill hole channels extend to the surface of the grouting sleeve; an acceleration sensor is fixed on the surface, at the tail end of the first drill hole, of the grouting sleeve and connected with an oscilloscope; and a force sensor is fixed on the surface, at the tail end of the second drill hole, of the grouting sleeve, one end of a force transfer rod is connected with the force sensor, and the other end of the force transfer rod penetrates the second drill hole and extends out of the wall body and is used for serving as a hammering stressed part. The method is simple and convenient to operate, visual and reliable in result and extensive in applicable working condition and is less influenced by on-site construction conditions, and the compactness of grouting concrete in the actual sleeve on site can be qualitatively or quantitatively judged in combination with an indoor full-scale model contrast test.

The invention discloses a wing design method considering pneumatic and structural multi-type design variables, which comprises the following steps of: firstly, constructing a parameterized shape by utilizing a three-dimensional category/shape function according to a shape control variable obtained in a pneumatic design process, obtaining Cartesian coordinates of a pneumatic shape point, and generating a smooth pneumatic shape curved surface on the basis of the shape point; By picking up controllable design variables in the wing structure tree, the internal structure arrangement of the wing under a given appearance is realized; By utilizing a neighborhood interpolation technology represented by RBF interpolation and taking an aerodynamic shape as a constraint, efficient follow-up matching of the structure arrangement and the shape parameters is realized; and finally completing the three-dimensional wing design under the coupling effect of the pneumatic/structural subject according to the independent or dependency relationship of different types of design variables on the model tree through a file positioning analysis method. Contents of two subjects of a pneumatic/structure are considered, linkage updating of the model is achieved, and the method has the advantages of being high in universality, wide in application range and convenient to use.

The invention relates to a stirring head for friction stir welding used for welding parts with different thicknesses and a welding method. A cutting accessory shaft shoulder is added on the basis of the existing stirring head, and the accessory shaft shoulder plays a role in cutting and removing the redundant material on the thicker side of connectors having different thicknesses to acquire a flat friction stir welding joint. The method is carried out on common friction stir welding equipment, a nose or tool of the equipment is not transformed at all, then the requirements on the equipment and the welding method are greatly simplified; in addition, in the welding process, a shaft shoulder of the stirring head and the two side surfaces of the part are parallel, so that the phenomena that metal of the connector is insufficiently extruded or damaged by shearing are not caused, the integrity and the reliability of the part are guaranteed; moreover, the accessory cutting shaft shoulder of the stirring head also plays an important role as for the part whose thickness suddenly changes, and the smooth welding process of the part is guaranteed.

The invention relates to an optimized configuration method of a voltage sag monitoring node. The method comprises: obtaining a critical fault resistor matrix based on a power grid topology and a system parameter; according to a fault resistor random distribution characteristic and the critical fault resistor matrix, establishing an inequality constraint; and obtaining an optimal monitoring node configuration scheme meeting the inequality constraint by targeting monitoring node number minimization. According to the method, a fault resistor of a short-circuit fault point is introduced into a monitoring node optimization configuration model, thereby eliminating a monitoring dead zone of the voltage sag.

A method for evaluating the reliability of a power module of a modular level converter, the method includes calculating junction temperature IGBT of IGBT and diode, junction temperature of diode and hot spot temperature of capacitor according to model data of IGBT module, model data of capacitor and MMC task profile, calculating junction temperature IGBT of IGBT and diode in steady state, calculating junction temperature of diode and hot spot temperature of capacitor, calculating junction temperature IGBT of capacitor, calculating junction temperature IGBT of IGBT and hot spot temperature IGBT, calculating junction temperature IGBT. The junction temperature of IGBT and diode is counted by rainflow counting method, and the low frequency thermal cycle list of the whole year is obtained. TheIGBT, diode and capacitor lifetime values are calculated by the preset lifetime model according to the low frequency thermal cycle list and the hot spot temperature of the capacitor. The Weibull lifedistribution is used to evaluate the reliability of the power module in the MMC. The electric thermal stress energy in the MMC is fully taken into account in the method. The method has good engineering applicability for evaluating the reliability of the MMC under different task profiles. At the same time, it overcomes the shortcomings of insufficient samples of life statistics data of DC engineering components.

The invention provides a polarization suppression processing method for radar mainlobe interference. The technical scheme is that: the method comprises the following five steps of: 1, constructing a function base relevant to a radar antenna polarization characteristic; 2, preprocessing an interference and target mixed signal; 3, performing orthogonal polarization decomposition processing on the interference and target mixed signal; 4, performing polarization filter vector estimation on the interference and target mixed signal; and 5, performing space domain multi-concave polarization filter on the interference and target mixed signal. A voltage matrix of the interference and target mixed signal is processed by using a least square algorithm, so that orthogonal polarization decomposition and estimation for the interference and target mixed signal are realized; and under the condition that a pitching angle cannot be acquired precisely, an interference signal is suppressed by using a space domain multi-concave virtual polarization filter. The polarization suppression processing method has no extra requirement on a hardware system, is easy to implement, and is high in engineering applicability.

Disclosed are an adaptive control method and equipment of arc swing in narrow gap welding. The control equipment is composed of an infrared camera system, a computer image processing system, an arc swing parameter control system, a bent-conducting-rod-type swing arc torch and the like. The infrared camera system acquires, in an external triggering manner, an infrared image of welding area when an arc is deviated towards the left or the right side wall groove, extracts information about the width of the groove in real time after image processing by a computer, and calculates an arc swing angle target value. The arc swing parameter control system controls a motor drive mechanism to rotate a bent conducting rod, and drives the welding arc to conduct circular arc swing according to the swing angle target value, thereby realizing the adaptive control for the arc swing angle according to changes of the groove width.

The invention discloses an active damage monitoring device for a hydraulic concrete structure. The device comprises a vibrating table (1), a waveform generator (2), a driver (3), a sensor (4), a digital filter (6), a digital collector (5), a wavelet packet analysis system (7) and a monitored hydraulic concrete structural body (8), wherein the monitored hydraulic concrete structural body (8) is arranged on the vibrating table (1); after the waveform generator (2) sends a swept-frequency signal to the driver (3), the driver (3) is excited to generate stress waves; the stress waves are propagated in the monitored hydraulic concrete structural body (8) and then are received by the sensor (4); stress wave signals sequentially pass through the digital filter (6), the digital collector (5) and the wavelet packet analysis system (7). The testing platform provided by the invention plays an important role in health monitoring of the hydraulic concrete structure and has the advantages of high accuracy, simple arrangement, low monitoring cost, high working efficiency, high engineering applicability and the like.

The invention discloses a chaos-based method for detecting and classifying early single-point faults of a mechanical component. The method comprises the following steps of: processing conventional sample fault signals in different states of the mechanical component to establish check intervals for different fault types; acquiring fault characteristic frequencies corresponding to all single-point fault states of the mechanical component to construct a frequency matrix of a Duffing chaotic oscillator; solving critical thresholds of periodic driving force amplitudes corresponding to different fault characteristic frequencies to construct a frequency-threshold matrix; and finally, adding a signal to be detected to calculate the maximum Lyapunov exponent matrix M, checking according to data inthe M, calculating correlation dimension of the signal to be detected if a fault signal is available, and classifying the faults to determine a fault mode in comparison with the established correlation dimension intervals for different fault types. By adopting the method, the early single-point faults of the mechanical component are detected and classified; and the method has high noise resistance capacity and extremely high fault detection success rate.

The invention relates to a model test device for the influence of foundation pit group excavation on the deformation of adjacent buildings. A multi-layer frame building model is placed in the left part of the model box, and an underground continuous wall model is placed in the middle and right parts of the model box respectively. The horizontal support model is fixed inside the wall model, the foundation pit floor model is fixed at the bottom, and the excavation construction simulation device of the foundation pit group is installed inside. and a plurality of dial gauge brackets, each displacement gauge is fixed on the upper surface of the soil or inside the soil layer through the displacement gauge bracket, and each dial gauge is fixed on the surface of the multi-layer frame building model through the dial gauge bracket, and the multi-layer A plurality of strain gauges are attached to the bottom of the base plate of the framed building model. The invention simulates the settlement of the surrounding stratum and the deformation of adjacent buildings caused by the excavation construction of the urban foundation pit group, and has important value for formulating the construction standard of the foundation pit group and the safety protection of the surrounding strata and adjacent existing structures.

The invention discloses a module-level error analytic control method for a phased array antenna system, which belongs to the technical field of electronics. The method comprises the following steps of: first, determining initial values of each module error according to a phased array system error analytic control probability model; then, establishing a numerical experiment model according to an amplitude-phase error of each module and an active unit directional diagram; next, generating a numerical test matrix; and finally, outputting a phased array antenna system error analytic control result meeting an expected requirement in a numerical experiment mode. The method finally guides a module design and an overall system design effectively by effectively regulating and controlling various types of errors of a system based on each of module errors and an interconnection mismatch influence among the module errors; and in reverse, the method also can evaluate performance indexes such as anarray minor lobe level of the phased array antenna system, a 3dB beam width, the gain loss of an array, beam-pointing accuracy and the like according to actual amplitude-phase errors of modules, and a system error caused by the interconnection mismatch of each of modules.

The invention discloses a multi-dimensional vibration isolation platform provided with multiple air springs and multiple dampers. The lower ends of the air springs and the lower ends of the dampers are connected with a base frame lower plate in a hinged mode through hinges. The upper ends of the air springs and the upper ends of the dampers are connected with a load disc through ball-shaped hinges. The load disc is connected with hydraulic cylinder piston rods of multiple hydraulic cylinders in a hinged mode through connecting rods. Cylinder bodies of the hydraulic cylinders are connected with a base frame upper plate in a hinged mode. The invention further discloses the air springs in the vibration isolation platform. By the adoption of the technical scheme, hydraulic pressure components serving as negative rigid components are in parallel connection with the air springs serving as positive rigid components, quasi-zero rigidity of the vibration isolation platform at a balance position and non-linear rigidity of the vibration isolation near the balance position are achieved, the difficulties caused when a traditional linear vibration isolation system isolates low-frequency vibration or ultra-low-frequency vibration can be solved, rigidity and damping can be adjusted simply and conveniently, and the multi-dimensional vibration isolation platform and the air springs are suitable for wide-frequency-domain vibration isolation and have good engineering applicability.