232results about How to "Strong engineering application value" patented technology

The invention discloses a dispatching end grid fault diagnosis method based on wide-area fault recording information. The method comprises the following steps that when a grid breaks down, fault data of a primary system of the grid are recorded according to a certain sampling frequency mode and are sent to a dispatching main station end through a fault recording networking system; the mapping relation between a basic data platform of grid equipment and a fault recording system is established through CT identification; different sampling frequencies of a fault recorder are unified to be the same sampling frequency according to an interpolation method; a differential-current out-of-limit value is set and independent grid equipment serves as a calculation unit to carry out differential-current calculation; whether the differential-current value is out of limit is confirmed to position fault places and confirm protection actions. The dispatching end grid fault diagnosis method has the advantages of solving the key problems that sampling frequency of the fault recorder is different and data are hard to synchronize, and achieves fault diagnosis application functions such as system operation state monitoring, protection behavior analyzing and accurate fault positioning through the fault recording information only.

The invention provides an inertia/astronomy/satellite high-precision integrated navigation system and a navigation method thereof. The inertia/astronomy/satellite high-precision integrated navigation system comprises a sensor module, an integrated navigation resolving module and a real-time display module, wherein the sensor module is sequentially connected in series with the integrated navigation resolving module and the real-time display module and comprises an inertia sensor, a star sensor and a satellite receiver; the integrated navigation resolving module comprises a four-step Runge-Kutta strapdown navigation resolving module, an astronomy attitude determination resolving module, an unequal-interval Kalman filtering module and a position and speed compensation algorithm module; and the real-time display module comprises a three-dimensional real-time display module. The navigation method realizes the real-time acquisition of sensor data, utilizes the inertia sensor data to carry out strapdown navigation resolving based on a four-step Runge-Kutta algorithm and can carry out the integrated navigation resolving on the inertia sensor data, star sensor data and satellite receiver data and carry out the real-time three-dimensional display on an integrated navigation result by utilizing a projection algorithm.

The invention discloses a method for automatically recognizing a target at medium and low altitudes and positioning a carrier with high accuracy and belongs to the field of scene matching guidance. The method comprises the following steps of: extracting a constant algorithm and establishing an H model based on an image scale characteristic to match and recognize targets and provide a high-accuracy navigation information source; coordinating and planning relative parameters according to a matching result which is fed back in a self-adaptive mode to further control matching performance; researching integral image-based average filtering which generates an image multi-scale space instead of Gauss convolutional filtering so as to increase a matching speed; establishing an image space transformation model which adapts to the strong matching capability of the algorithm based on the thought of random sampling consistency according to an image matching result; and eliminating accurate positioning pixels of wrongly matched points based on the model to recognize the target and provide the high-accuracy navigation information source through model mapping, and simultaneously, selecting a digraph of known transformation parameters to verify the performance and the result of an image matching algorithm according to the transformation model.

The invention discloses a maneuvering extended target tracking method based on unscented Kalman filter, and belongs to the field of radar maneuvering target tracking. The method comprises the steps that according to characteristics of high-resolution range profile measurement information and a maneuvering characteristic of an extended target, and by utilizing various maneuvering modes which support functions to precisely describe the extended target, and finally based on a combination of the unscented Kalman filter and a multiple model algorithm, joint tracking of motion states and extension forms of the extended target is achieved. According to the maneuvering extended target tracking method based on the unscented Kalman filter, high-resolution radar range profile measurement information can be fast and precisely utilized, and precise joint estimation is conducted on the motion states and the extension forms of the extended target. Engineering is easy to achieve, and the method has a strong engineering application value and a popularization prospect.

This invention discloses a combined simulation method and a device for dynamic performance of trains and their circuit system, which utilizes a visual technology of computers to simulate various dynamic performances of stability, smoothness and curves of trains running on the circuit and simulates the operation state of any train at any circuit in carriages, trucks and various shaft locomotives and displays the moving state in three-dimension scene.

The invention provides a speed sensorless control method for a doubly-fed wind turbine generator system. According to the control method, sliding-mode control and model reference self-adaption control are organically integrated, the stator current measurement value of a doubly-fed wind generator is selected to serve as a reference model, a stator current adjustable model can be obtained through stator flux linkage and the rotor current, a sliding-mode face is constructed through the cross products outputted by the two models, the rotor position and the rotating speed are obtained through the sliding-mode algorithm, and then the vector control strategy of the doubly-fed wind generator is achieved. The control technology algorithm is simple, cost of the generator can be reduced, complexity of hardware can be lowered, and the speed sensorless control method has high robustness for parameter changes and load disturbance of the doubly-fed wind generator, is high in reliability and easy to implement and has great engineering application value.

The invention discloses a preparation method of a magnetic wave absorption patch shrinkage simulation composite material. The method comprises the following steps: step 1, in a given thickness range, calculating a bevel reflectivity of the simulation composite material of different formulas at a shrinkage frequency, finding out the simulation composite material with the bevel reflectivity most approximate to that of a magnetic wave absorption patch prototype material under a prototype frequency, and determining the formula of the simulation composite material; step 2, weighing electromagnetic particles and binders; step 3, charging, and mixing; step 4, vulcanizing to obtain a vulcanized sheet; and step 5, thermally treating the vulcanized sheet to obtain a magnetic wave absorption patch for shrinkage simulation. By adopting the preparation method, the problems that the electromagnetic parameters of electromagnetic particles are difficult to test, the influence of the shape and distribution form of the electromagnetic particles to the equivalent parameters of the material is difficult to calculate and the like can be avoided, the accurate calculation of the equivalent electromagnetic parameters of the composite material is realized, the formula is obtained by virtue of the optimized design of the bevel reflectivity, the engineering application value is high, and the method can be widely used for preparing the shrinkage simulation composite material.

The invention discloses a method for predicting the wind speed of a wind power plant at a short term. The method includes the following steps that wind speed data in a period of time are acquired and reduced into a time sequence for analytical prediction; a carpet traversal search method is adopted, and based on a dynamic cubic exponential smoothing prediction method, dynamic smoothing coefficients are determined according to the criterion of the minimum error sum of squares; the determined dynamic smoothing coefficients and the dynamic cubic exponential smoothing method are utilized to conduct one-step or multi-step prediction; the rest is conducted in the same way, new historical data are acquired, the smoothing coefficients are updated, and the later wind speed prediction continues to be conducted. According to the method for predicting the wind speed of the wind power plant at the short term, the characteristics of local historical wind speed are comprehensively considered, and the prediction effect is good.

The invention discloses a visual simulation method for dynamic performance of a railway track system. The profile data of the steel rails and train wheels within the influencing range of train vibration are added with the vibration displacement data to rebuild steel rails and train wheels with a vibration shape, simulate deformation under force of steel rails and train wheels, thus realizing visual simulation of vibration behaviors of steel rails and train wheels in a railway track system. The method can more actually comprehensively simulate various dynamic performance of a track system while a train is running, and is characterized by high integrity; the invention can also visually display the dynamic status of the train and the track in a three-dimension scene, which is intuitionistic, vivid and simple for use.

The invention provides a measuring and calculating method for a modulation transfer function of a satellite-borne camera, and relates to the technical field of space optics. According to the method,the problem that according to an existing method that a modulation transfer function is measured and calculated through point light sources, a parametric model is needed for approximation and fitting. Firstly, multiple point light source targets are laid before satellite transit, then images corresponding to point light sources are intercepted in captured images, after the background luminance value is removed, a two-dimensional point spread function is directly solved by the adoption of a regularization solving method according to an imaging mathematical model, and finally a modulation transfer function is calculated through the point spread function. The measuring and calculating method is easy to implement, the data processing process is simple, convenient and precise, and the method has a great significance in imaging quality assessment of the satellite-borne camera and has broad application prospects.

The invention provides a cantilever beam type vibration absorber with adjustable frequency. The cantilever beam type vibration absorber comprises a base, a cantilever beam and a mass disc, the lower end of the base is fixed to vibration equipment, through holes are formed in the upper end of the base and the mass disc, internal threads are arranged in the through holes, external threads matched with the through holes are arranged on the cantilever beam, the cantilever beam is arranged in the through hole of the base and the through hole of the mass disc through the external threads, fixed nuts are arranged at the two ends of the through hole of the base and fix the position of the cantilever beam and the base, adjusting nuts are arranged at the two ends of the through hole of the mass disc and limit the relative position of the cantilever beam and the mass disc, the adjusting nuts are adjustable, that is, the relative position of the mass disc and the cantilever beam is adjustable. The vibration absorption frequency of the vibration absorber can be flexibly adjusted, and the adjustable scope is wide. Parts are easy to machine and replace. Compared with an electromagnetic type unable vibration absorber and an electrodynamic type tunable vibration absorber, the electromagnetic leakage phenomenon is avoided. The cantilever beam type vibration absorber is simple in structure, stable in work and easy to mount.

The invention provides a mine shaft well engineering surrounding rocks artificial intelligence stage division method which comprises the following steps: (1) establishing a nerve network model, (2) training a sample set, (3) carrying out network training and (4) carrying out network simulation. The invention has the following advantages: a network system is simple in operation, influence of artificial factors can be eliminated, an interaction relation between factors can be automatically found, and with regards to a shaft well project which lacks a deep part stage division experience, the system can solve stability stage division of a rock well under complex conditions of high ground stress, high underground water pressure, high ground temperature and the like at a shaft well deep part and has a strong engineering application value.

The invention discloses a UWB assisted inertial positioning method based on a fault-tolerant decision-making tree. For the non-line-of-sight problem of errors of an inertial navigation system with time accumulation and UWB positioning and the gross error problem due to a multipath effect and human body influence. A gyroscope high-precision segmented fitting error compensation model is proposed andadopted, and inertial navigation error drift is inhibited; meanwhile, based on UWB assisted personnel indoor inertial positioning, a fault-tolerant decision-making tree judgment model having the combined action of inertial navigation and UWB single-point positioning data is constructed, gross error factors of UWB positioning are eliminated, thus extended Kalman filter is applied to inertial navigation and UWB parameter differences, UWB assisted enhanced inertial navigation positioning is achieved, long-time continuous and reliable positioning can be achieved, and the method has a very strongengineering application value.

The invention discloses a technology and device for treating coking wastewater through an ozone catalytic oxidation combined biofilter. The technology and device are reasonable in design, low in operation cost, solve the problem related to advanced treatment and recycling of coking wastewater, and have a high engineering application value; the technology and device eliminate the unsafe factors for operators and potential risks threatening the health in a heavily polluted environment with coking wastewater, and are simple to operate and low in operation cost; the effluent water quality meets different water use requirements.

The invention relates to a wheel-rail vertical force continuous measurement method based on rail strain, comprising the following steps: a. one section of rail above a single sleeper is taken as an elastomer for measuring wheel-rail vertical force; b. two groups of appropriate strain outputs on a neutral axis of the elastomer are selected, slopes of all straight lines which are corresponding to different longitudinal action point positions of a sensing region of the elastomer and determined by the strain outputs under two sleeper support reference states are obtained on the same vertical force strain output plane; c. the strain output of passing through the sensing region of the elastomer of wheels is measured, the longitudinal positions of the action points of the vertical force are identified, negative values which are corresponding to the slopes obtained in the step b are taken as combination factors, the combined strain output is obtained by combining the selected two groups of strain outputs in the step b, and the combined strain output is unrelated with the sleeper support state; and d. the vertical force is obtained by the combined strain output of the effective measurement region. A measurement device comprises an elastomer selection unit, a strain selection and parameter obtainment unit, a longitudinal position identification and strain combination unit and an output unit which are connected.

The invention discloses an integrated navigation information fusion method. The method is mainly divided into a GNSS satellite signal processing module, a SINS attitude, velocity and position updatingmodule, a SINS error compensation module, a SINS/GNSS information fusion module, a SINS error correction module and a result output module. According to the method, by means of high-frequency SINS attitude, velocity and position updating and low-frequency GNSS information measurement, the elevation angle and navigation information carrier-to-noise ratio of all visible satellites tracked by an integrated navigation receiver are combined, a SINS/GNSS integrated navigation Kalman filter observation noise matrix is adaptively adjusted in real time, by means of GNSS and SINS pseudorange and a pseudorange rate measuring value, an integrated navigation Kalman filter state equation and an error covariance matrix are updated, and finally by means of SINS and GNSS information infusion feedback, aninertial device measuring error is corrected. According to the integrated navigation information fusion method, the purpose that under the complex electromagnetic environment, the integrated navigation receiver completes robust information fusion resolving can be achieved, and the method has high integrated navigation receiver design theory value and engineering application value.

The invention discloses a method for determining the pile spacing of anti-liquefying vibrating-impacting crushed-stone piles. The method comprises the following steps of 1, judging the liquefied degree of foundation soil according to an in-situ test, wherein one or several methods in a, a critical standard penetration number method, b, a static sounding judging method and c, a shear-wave velocity method is or are adopted by the liquefaction judging method of the foundation soil; 2, determining the dry density needing to be reached by the foundation soil among the piles for eliminating liquefaction; 3, determining the pile spacing of the crushed-stone piles. According to the contrastive analysis of the on-site in-situ testing, the indoor test and the finite-element numerical-value analyzing results of the foundation soil before and after driving the crushed-stone piles, the anti-liquefying efficacy of the vibrating-impacting crushed-stone piles is comprehensive studied, and the method for determining the pile spacing of the crushed-stone piles is provided on the basis and on the basis of a compaction effect, so that pile-testing projects are omitted, the construction period is shortened, and the construction cost of the projects is lowered.