201results about How to "Improve engineering practicability" patented technology

The invention relates to a self-learning mechanism-base fast matching fuzzy reasoning method. The method includes the following steps that: a Gaussian membership degree function method is adopted to construct parameter fuzzification information; a fuzzy rule base is established; external parameters are fuzzificated, so that a fact item can be obtained; the fact item is matched with rules in the fuzzy rule base by adopting a rete algorithm, so that a fuzzy reasoning result can be obtained; the fuzzy reasoning result is subjected to defuzzification, so that a final reasoning result can be obtained; and a sample set is constructed according to the final reasoning result and an actual feedback result, and rule strength self-learning correction is carried out based on the sample set. According to the self-learning mechanism-base fast matching fuzzy reasoning method of the invention, the rete algorithm is adopted, so that the efficiency of fuzzy reasoning can be improved, and the fuzzy reasoning method can be applied to the engineering field with high real-time requirements.

The invention provides a full-duplex active phased array antenna radio frequency link system and a method for determining transmit-receive isolation. An emission phased array system radio frequency link is composed of an emission antenna array plane, a resistance receiving filter, a power amplifier, a phase shifter, a one-to-M power divider, a driving power amplifier and a one-to-N power divider. A receiving phased array system radio frequency link is composed of a receiving antenna array plane, a resistance sending filter, a lower-noise amplifier, a phase shifter, a P-to-one synthesizer, a driving low-noise amplifier and a Q-to-one synthesizer. The method comprises the steps of: firstly extracting voltage scattering vectors, then calculating the power coupled to the receiving phased array system radio frequency link, and determining the isolation of the resistance sending filter; in addition, calculating total heat noises coupled from the emission phased array system radio frequency link to the receiving antenna array plane, and determining the isolation of the resistance receiving filter. The full-duplex active phased array antenna radio frequency link system and the method for determining the transmit-receive isolation solve the problems in the prior art that the isolation is designed according to design experience, the design balance is large, and the design difficulties of the resistance receiving filter and the resistance sending filter are increased.

The invention discloses a plate structure impact monitoring method based on the fractal theory, and belongs to the technical field of impact monitoring of structure health monitoring. The method comprises steps as follows: step one, distribution of distributed fiber bragg grating sensors; step two, computation of box-counting fractal dimensions of the fiber bragg grating sensor impact response signals; step three, collection of the fiber bragg grating sensor impact response signals corresponding to sample impact points and box-counting fractal dimension computation; step four, collection of the fiber bragg grating sensor impact response signals corresponding to to-be-detected impact points and box-counting fractal dimension computation; step five, computation of x-axis coordinates of the to-be-detected impact points; step six, computation of y-axis coordinates of the to-be-detected impact points. According to a positioning algorithm, the positions of the impact points are judged through computation of the box-counting fractal dimensions of fiber bragg grating sensor impact response signal frequency spectrums, and the method has the characteristics of no need of a large number of prior knowledge, simplicity, rapidness, convenience, high practicability and the like.

The invention belongs to a nondestructive detection technology and relates to an industrial scale ultrasonic automatic scanning and imaging detection device used for large-scale structures made of composite materials and metal materials in the fields of aviation, aerospace, electronics, weapons, ships, metallurgy, iron and steel, transportation, construction and the like. The detection device comprises an ultrasonic automatic scanning system, an ultrasonic automatic scanning control and imaging system and a multi-channel ultrasonic system. The design according to the invention adopts a multi-axis parallel numeric control upward floating type super-static steady scanning mechanism and an ultrasonic flexible self-adaptive tracking array acoustic scanning technology, thereby greatly improving the ultrasonic automatic scanning and imaging detection efficiency and the imaging quality of the large-scale structures, realizing the industrial scale high-efficient ultrasonic automatic scanning and imaging detection of the large-scale structures made of the composite materials and the like in different specifications and enabling the detection resolution and a surface blind zone to achieve 0.13mm; and when 20 channels are detected, the efficiency is improved by at least 50 times compared with the manual scanning detection efficiency, and is improved by 20 times compared with the traditional single-channel ultrasonic automatic scanning detection.

The invention discloses a low-profile two-dimensional wide-angle scanning circular polarization phased-array antenna, and aims to provide an antenna structure which is easy to integrate and has good wide-angle scanning gain characteristics and circular polarization characteristics. According to the technical scheme, each 3D structure antenna unit forms an array unit of the two-dimensional wide-angle scanning circular polarization phased-array antenna through metal columns which are arranged between an annular radiator and a circular polarization patch slotting radiator in a circumferential circular array mode; each 3D structure antenna unit is fixed on the two-dimensional layer surface of the upper dielectric plate through a feed column fixedly connected to the lower surface of the circularly polarized slotted patch radiator; the feed column penetrates through the lower dielectric plate, the four 3D structure antenna units are connected with the annular radiator upwards and are connected with the feed base disc downwards, the four adjacent 3D structure antenna units form a 2*2 rectangular arrangement subarray in a touch type feed and 90-degree sequential rotation arrangement mode,and the four feed base discs are delayed by 90 degrees clockwise in sequence for feeding, so that the optimal right-handed circular polarization performance is obtained.

The invention discloses a distribution network fault recovery method based on an A* algorithm and a fireworks algorithm. The method comprises the steps of (1) reading original data of a distribution network and simplifying the distribution network, (2) converting a contact switch into a virtual distribution power generation device DG and classifying the DG, (3) carrying out first stage algorithm,defining an initial node and a solution node, and using the A* algorithm to carry out power supply recovery on an important load, (4) carrying out second stage algorithm, reading distribution networkdata after first stage optimization, and using the fireworks algorithm to carry out power supply recovery on a rest load, and (5) integrating the optimal programs of the two stages, and determining afinal fault recovery program. According to the method, a staged method is adopted, a globally optimal solution is ensured, and the computing speed is fast.

The invention discloses a breakdown diagnosis method for semiconductor devices. The method includes the following steps: firstly establishing an expert system which includes a fuzzy rule database and an inference engine; further, conducting fuzzy processing on a semiconductor device real-time monitoring parameter to generate a fuzzy fact; the inference engine, on the basis of the fuzzy fact, performing fuzzy processing by interacting with the fuzzy rule database to generate a breakdown diagnosis result; and on the basis of actual application conditions of the breakdown diagnosis result, carrying out rule intensity self-learning correction targeted at the fuzzy rule database. According to the invention, the method performs fuzzy inference and further obtains the breakdown diagnosis result based on the rete algorithm, and carries out rule intensity self-learning correction on the fuzzy rule database in combination with the actual application of the breakdown diagnosis result, so that the method increases the precision and automation of the breakdown diagnosis for semiconductor devices and ensures efficient and stable operation of the semiconductor technology.

The invention discloses a low speed impact position identification method based on approximate entropy calculation and belongs to the impact monitoring technology field of structure health monitoring. The method comprises the following steps of step1, carrying out distributed optical fiber bragg grating sensor layout; step2, adopting a calculating method of optical fiber bragg grating sensor impulse response signal approximate entropy; step3, collecting an optical fiber bragg grating sensor response signal corresponding to an impulse point to be measured and carrying out approximate entropy calculation; step4, determining an area where the point to be measured is located and calculating an approximation entropy of a sample impulse point response signal in the area; step5, constructing a relation model of a distance of the impulse point to a sensor and a corresponding approximation entropy difference value; and step6, based on a three-line crossing method, determining a position of the impulse point to be measured. A positioning algorithm in the invention possesses characteristics that a lot of prior knowledge is not needed; and practicality is high and so on.

Belonging to the technical field of impact monitoring of structural health monitoring, the invention discloses a low velocity impact location identification method based on correlation dimension calculation and three-circle intersection principle. The method includes the steps of: 1. sensor layout; 2. correlation dimension calculation of impact response signal time sequence; 3. processing of sensor response signal corresponding to a to-be-measured impact point and correlation dimension calculation of its time sequence; 4. determination of the area where the to-be-measured point is located, and calculation of the correlation dimension of sensor response signal time sequences corresponding to different sample impact points in the area; 5. building of a relational model between the length from a sample impact point to a sensor and the correlation dimension of sensor response signal time sequence in the area where the sample point is located; and 6. calculation of the specific coordinate location of a to-be-measured impact point based on three-circle intersection. The method provided by the invention has the characteristics of no need for a lot of prior knowledge and good transplantability, etc.

The invention relates to an absolute navigation filtering method capable of estimating drifting of an accelerometer. A GPS (Global position system) receiver is adopted to output position information, the PI type filtering technology is adopted to estimate the position error, the speed error and the acceleration error, Kalman filtering calculation is omitted, the satellite calculation amount is greatly simplified and the acceleration error is estimated, and therefore, the absolute navigation filtering method has the beneficial effects that the inertial navigation recurrence precision can be improved, the autonomous navigation precision is remarkably improved, the engineering practicability is improved, the new thought for autonomous navigation is acquired, the application to deep space exploration soft landing can be expanded and the like.

The invention belongs to the field of radar signal processing, and in particular relates to a sparse hole diameter ISAR imaging method based on SBL-ADMM. The method comprises the following steps of S1, sparse hole diameter radar echo modelling; S2, target HRRP and ISAR image statistical modelling; and S3, sparse hole diameter ISAR image reconstruction based on SBL-ADMM. The method provided by the invention has the beneficial effects that the target sparse prior information can be fully used, the high-resolution target ISAR image can be reconstructed from the sparse hole diameter radar echoes; and aiming at the problem that solving of the posterior probability during an ISAR imaging process involves matrix inversion and is high in computation complexity, ADMM is combined with the SBL theoretical framework, the computation efficiency of the sparse hole diameter ISAR imaging method is significantly improved, and the engineering practicability of the method is greatly enhanced.

The invention discloses a device and a method for hydraulic structure deformation distribution type optical fiber monitoring. The device comprises a through-bottom vertical shaft, wherein a displacement platform is arranged in the through-bottom vertical shaft, drill bit driving devices are arranged at the two sides of the displacement platform, are connected with conical drill bits, and are respectively connected with lifting ropes, the lifting ropes are wound around coiling discs, the middle part of the displacement platform is connected with one end of each of a pair of springs, the other end of each of the pair of springs is hinged to a vertical measuring ruler, the vertical measuring ruler penetrates through a scale platform, an optical fiber hanging bucket is arranged between the two springs, a wavy loop optical fiber is arranged in the optical fiber hanging bucket, an optical fiber buckle is arranged on the wavy loop optical fiber, an optical wave transmitter is arranged at the input end of the wavy loop optical fiber, and an optical wave collector is arranged at the output end of the wavy loop optical fiber. The device has the advantages and characteristics that the repeated use is realized, the installation is very convenient, the real-time detection and maintenance are realized, the distributed type structure is realized, the micro and macro effect and real-time effect are realized, the suitability to complex environment is high, and the like.

The invention discloses a device and a method for monitoring the vertical deformation of a hydraulic construction. The device comprises a bottom-through shaft and an inner carrying tube positioned inside the bottom-through shaft, wherein a displacement station is arranged in the inner carrying tube; drive motors are symmetrically arranged on two sides of the displacement station, and are connected with a conical drill by virtue of a five-stage piston; piston shells on two sides are respectively connected with lifting devices which are used for promoting motion of the piston shells; correcting devices which are used for correcting level of the displacement station are symmetrically arranged at two ends of the displacement station; the middle part of the displacement station is connected with one end of a group of symmetrically arranged springs, and the other end of each spring is hinged with a vertical measuring tape; an optical fiber hanging drum is arranged between two springs, and is filled with a corrugated loop optical fiber; and an optical fiber buckle is arranged on the corrugated loop optical fiber. The device has the advantages of use repeatability, convenience in assembly, real-time detection and maintenance and the like, and has the characteristics of distribution type, micro-macro structure, real-time performance, high adaptability to complex environment and the like.

The invention discloses a calculation method of a static voltage stability critical point of a power system, which solves the problem that the power flow at the static voltage stability critical pointis unsolvable due to the singularity of a Jacobian matrix. The main steps include: calculating the basic power flow, increasing the node load until the classical Nulla method does not converge, usingthe AQ node method to calculate the critical point of the static voltage stability of the system and so on. By introducing a new node type-AQ node into static voltage stability analysis, this methodimproves the traditional continuous power flow analysis method which needs to be corrected repeatedly to obtain the critical point of static voltage stability, This method can cause 'deflection' of matrix singular points at the critical point of static voltage stability, eliminate the singularity of Jacobian matrix completely and obtain the critical point of static voltage stability quickly and accurately, because it takes a long time and may not converge in the correction process and calculation processes are complex.

The invention relates to a multi-unmanned aerial vehicle cooperative wide-area moving target searching method based on a hybrid mechanism, and belongs to the field of unmanned aerial vehicle cooperative target searching. The invention provides the multi-unmanned aerial vehicle cooperative wide-area moving target searching method based on the hybrid mechanism to solve the problems that an existing multi-unmanned-aerial-vehicle cooperative wide-area moving target searching method is wide in task area range, low in searching efficiency, too long in task searching time, direct in course angle discretization and the like. The multi-unmanned aerial vehicle cooperative wide-area moving target searching method integrates the advantages of coverage search and an information graph-based search mode, divides a task area into a key area and a general area according to the target existence probability, preferentially covers and searches the key area by using a scanning line, and searches the general area by using a pheromone-based mechanism. On the basis, the track of each unmanned aerial vehicle is optimized in an online rolling manner by adopting a rolling time domain optimization method. According to the method, the moving target in the task area can be quickly searched, the flight paths of a plurality of unmanned aerial vehicles can be generated online, and the task searching time is effectively shortened.

The invention belongs to the technical field of power system power distribution network planning and operation, and particularly relates to a reconstruction method for a power distribution network with a distributed power supply after serious fault. The method for reconstructing the power distribution network with the distributed power supply after serious fault is suitable for rapid reconstruction of the power distribution network with the distributed power supply after the serious fault, and is convenient to model, high in simulation precision, high in calculation efficiency and strong in expansibility. The method comprises the following steps: 1, establishing an objective function and constraint condition model of a reconstruction problem after the power distribution network has the fault; 2, performing modeling analysis on the distributed power supply when power distribution network fault occurs; 3, adopting a spanning tree model based on the graph theory to solve an optimal methodof island division; 4, completing the weight dynamic division of a multi-objective function through a membership function, and normalizing a power distribution network reconstruction multi-objectiveoptimization problem into a single-objective optimization problem; and 5, solving the reconstruction optimization problem based on an empire competition algorithm to obtain an optimal reconstruction strategy after the serious fault of the power distribution network.

The invention provides a detection method for an initial position of a rotor in a static state of a PMSM. A voltage vector is injected along the direction of a random phase of stator, and proper voltage pulse injection time is determined; a pair of basic space voltage vectors in positive and negative directions is injected to the PMSM in the static state along the direction of each of three phasesof stators, and a three-phase current value of the PMSM is detected and recorded the moment that a pulse effect of each basic space voltage vector ends; and current values, obtained by sampling, of each phase are accumulated algebraically, and an angle of the initial position of the rotor of the PMSM is calculated according to a formula. The method does not needs a lot of data operation, a realization algorithm is simple, steps are simple, realization is easy, and the engineering practicality is higher; the method is not limited by the saliency of the rotor, and can be widely applied to surface-mounted and embedded PMSMs.

The invention provides a risk assessment method for city waterlogging taking water level jacking influence of tidal rivers. The method comprises following steps: determining probabilities of simultaneous distribution between rainstorms-tidal river water levels, determining a hydraulic computation grid of a hydrology-drainage system for analyses of city waterlogging risks, creating a coupling model of a hydrology-drainage system to calculate a waterlogging parameter h in the grid, creating a waterlogging risk analyzing map taking water level jacking influence of tidal rivers, covering probability density of simultaneous distribution to a hydraulic grid of the hydrology-drainage system, connecting same waterlogging parmaters h to the isoline Lh; and calculating different occurrence probabilities of h0 to obtain city waterlogging parameter values in different recurrence intervals. The risk assessment method for city waterlogging taking water level jacking influence of tidal rivers has following beneficial effects: rainstorms and high water levels of tidal rivers can be imitated within the extreme value range so that low dependence is on hydrologic hydraulic historical data, thereby enhancing engineering practicability; and only by calculating the combined scene between a specific hydrology-drainage system and the hydraulic grid, coupling events of rainfall and tidal river water levels are not needed to be imitated so that assessment efficiency is greatly increased.