247results about How to "Good engineering application value" patented technology

The invention discloses a video-based traffic information acquisition method. The method comprises the following steps: based on the image processing and the mode identification theory, setting a detection region and carrying out geometric correction, extracting the foreground object by Gaussian Mixture Model, identifying a target by a separator, matching the identification result with the foreground object, eliminating the detected false-alarm, fusing the particle filter algorithm and the vehicle detection algorithm to achieve the self-adaptive track of vehicles, achieving the effective target increase and target fusion on basis of the detection result, and finally achieving the calculation of parameters, such as flow statistics, speed, intensity, time occupancy ratio and the like. Furthermore, according to the detection track result; the microscopic traffic analysis on the target, such as the detection on illegally parked vehicles, retrogradation, and overspeed can be also carried out. At the same time, the traffic status, such as traffic congestion detection can be judged; and the queue length calculation under the congestion condition can be calculated. The method has the advantages of high accuracy and low computing complexity and can meet the requirement of the actual application.

The invention discloses a double-flexible-grinding-head magnetorheological polishing device. In the device, a vertical gantry of a bed body and an X-axis are both fixed on a horizontal base; a worktable is fixed on a sliding block of the X-axis; a Y-axis is fixed on a horizontal beam of the vertical gantry; and a first Z-axis and a second Z-axis are arrangedon the Y-axis in parallel. A large flexible grinding head is installed on the first Z-axis; and a small flexible grinding head is arranged on the second Z-axis. A high-flow circulation system connected with the large flexible grinding head and a low-flow circulation system connected with the small flexible grinding head are arranged on a trolley. A control cabinet is arranged at the rear part of the vertical gantry; and a circulation system cabinet and a cleaning system are arranged at the side surface of the vertical gantry. The double-flexible-grinding-head magnetorheological polishing device provided by the invention has the advantages of high accuracy, high rigidness, high stability and high dynamic property. The double-flexible-grinding-head magnetorheological polishing device not only can be used for processing of large-caliber phase elements, but also can be used for high-accuracy processing of large-caliber planar optical elements within the range of full caliber. The optimal matching of the processing efficiency and the processing accuracy can be realized.

The invention discloses a method for actively inhibiting the flexible vibration of a sun sailboard. According to the method, a stepping motor under sine and cosine subdivision drive is an executing mechanism, a satellite system dynamics model is established, after linear simplification is performed on the system dynamics model, the vibration frequency and the damping ratio of a system are calculated, an input former is designed to reshape an original sailboard rotating speed instruction, so that the system finishes sailboard rotating speed continuous drive and effectively inhibits the flexible vibration of the sailboard at the same time, and therefore influences on the load imaging quality by the flexible vibration of the sailboard are reduced. In addition, model parameter variation and design parameters do not have the strong robustness, compared with other sun sailboard flexible vibration control methods adopting piezoceramic materials, dampers and the like, adding of extra hardware devices is not needed, and engineering realization is simple.

The invention discloses a three-dimensional visualization simulation method directed at boundary element analysis. The three-dimensional visualization simulation method comprises reading in result documents output after the boundary element analysis; establishing vertex buffers and index buffers, and recording node coordinate information and node numerical value information into the vertex buffers and unit organization information into the index buffers to generate grid models, entity models, cloud models and reference coordinate systems; and performing rendering, three-dimensional operation or other operation synchronously on the models and the reference coordinate systems. The method processes the result documents after the boundary element analysis, only fundamental information of construction models and clouds is needed to be input, no special requirement exists for formats, and common business engineering software of Ansys, Patran, Sesam and the like can be used for providing input information. The method has a flexible processing mechanism, wide applicability and good practical engineering application values.

The invention discloses a method and system for integrated navigation of a laser inertial measuring unit and an odometer. The method comprises steps of: S1, collecting an odometer pulse number in N sampling periods at a normal operation condition, and solving a pitching installation drift angle and a course installation drift angle between the inertial measuring unit and the odometer; S2, establishing a state equation; S3, establishing a measurement equation, which comprises a measurement value 1 shown in the description being a displacement increment of the inertial measuring unit in a No. i sampling period under a navigation system, a measurement value 2 shown in the description being an odometer increment of the inertial measuring unit in the No. i sampling period, and a measurement value 3 shown in the description being a displacement projection of the inertial measuring unit under the navigation system; and S4, utilizing the state equation and the measurement equation, and performing Kalman filtering for correcting parameter errors of an inertial navigation system and a device in real time to complete integrated navigation. The invention further provides a system for realizing the method. By implementing the method and the system, an error of integrated navigation can be effectively corrected, and the accuracy of integrated navigation can be greatly improved. The method and system are particularly suitable for a situation when the inertial measuring unit is inclined at a large angle.

The invention discloses a model for calculating the iron loss of a switched reluctance motor, and belongs to the technical field of the calculation and analysis of the iron loss of the switched reluctance motor. The model is a variable coefficient binomial calculation model; according to the model, by conducting the data analysis of the actually measured loss value of a ferromagnetic material under the conditions of different frequency and magnetic field intensity, the laws of a few key parameters such as hysteresis loss coefficient and eddy current loss coefficient varying with the magnetic induction intensity and frequency can be obtained, thus the iron loss of the ferromagnetic material at the time of sinusoidal alternating magnetization can be calculated. According to the magnetic induction intensity waveform non-sinusoidal special situation in the switched reluctance motor, the finite element method calculation is applied to obtain the waveforms of the tangential direction and radial direction magnetic induction intensity, changing with time, of each part of a motor, the Fourier decomposition is applied to decompose an non-sinusoidal magnetic induction intensity waveform into a list of sinusoidal waveforms, the variable coefficient binomial calculation model is adopted to calculate the iron loss of harmonic waves in each time, then the accumulation and summation is conducted so as to obtain a harmonic wave unit quality iron loss model after accumulating for (i)n(/i) times.

The invention relates to fault diagnosis of a reciprocated compressor and provides a large and small head tile fault diagnosis method of a reciprocated compressor connecting rod based on a simulated indicator diagram. The method comprises the following steps of: based on a numerical simulation method, carrying out numerical simulation to obtain an air cylinder pressure change rule of a reciprocated compressor under an actual work state; drawing the simulated indicator diagram; and calculating gas pressure on a piston. Reciprocated inertia force of a set is calculated according the rotating speed of the set and the mass of a reciprocated movement part; and a whole stressing condition of the movement part is calculated by combining the gas pressure on the piston, so as to obtain a cross head pin theoretical steering point and a stressing state of a connecting rod large head tile. The reciprocated compressor is used for an online monitoring diagnosis system to obtain an impact vibration signal of a cross head part; and the fault of a connecting rod small head tile is analyzed and diagnosed by combining the theoretical cross head pin steering point and the theoretical stressing state of the connecting rod large head tile. The method does not need to mount a dynamic pressure sensor, namely large and small head tile faults can be diagnosed; and the cost is reduced and the risk of instructing a power hole or mounting the dynamic pressure sensor is avoided.

The invention relates to a marine booster station site selection optimization method. The method comprises the following steps that an offshore closest point a of a marine booster station is obtained according to a coordinate of a land centralized control center; a gravity center point b of a marine wind power plant is obtained according to all coordinates of N draught fans, and a straight line L is obtained according to the gravity center point b and the offshore closest point a; multiple points c are preset on the straight line L, coordinates of the points c, a coordinate of the gravity center point b and a coordinate of the offshore closest point a are preset to be initial coordinates of the marine booster station respectively, and corresponding collecting power line layouts of the marine wind power plant are obtained respectively; when the total cost corresponding to one point c or the gravity center point b or the offshore closest point a is smaller than or equal to the preset total cost, the point is the optimal coordinate of the marine booster station. According to the marine booster station site selection optimization method, marine wind power construction conditions can be comprehensively considered, and the construction cost of the marine wind power plant is reduced to the maximum extent.

The invention discloses a switched reluctance linear motor magnetic circuit modeling method especially suitable for switched reluctance linear motors of various phase number structures and belongs to the field of switched reluctance linear motor modeling and controlling. The switched reluctance linear motor magnetic circuit modeling method is characterized in that all calculation formulas of reluctance components in six magnetic circuits at a rotor position xu where the central line of a rotor groove is aligned at the central line of a stator tooth, at a rotor position x0 where the front edge of a rotor tooth is aligned at the front edge of the stator tooth, at a rotor position x1/4 where the rotor tooth and the stator tooth are overlapped by one four of width of the stator tooth, at a rotor position x1/2 where the rotor tooth and the stator tooth are overlapped by one half of the width of the stator tooth, at a rotor position x3/4 where the rotor tooth and the stator tooth are overlapped by three fourths of the width of the stator tooth and at a rotor position xa where the central line of the rotor tooth is aligned at the central line of the stator tooth are combined to form a magnetic circuit model of a switched reluctance linear motor. A motor electric magnetic field finite element method does not need to be adopted to calculate magnetic characteristics of the motor, the method is suitable for the switched reluctance linear motors of various phase number structures, quick design, realtime simulation and realtime control of a switched reluctance linear motor system can be realized, and the method has good engineering application value.

The invention discloses a rapid retrograde detecting and tracking monitoring method under complex environment, and the method comprises the following steps of: extracting moving objective foreground from video frames through a inter-frame difference method, then calculating an optical flow field at each point from the strong corner set of future objectives to obtain the optical flow field set; judging whether a moving direction of the strong corner is within the set retrograde direction and its allowance: if so, recording these points, forming the retrograde point set, and giving a rapid detection warning, at the same time, precisely warning by tracking to judge whether retrograde events are occurred, obtaining the strong corner set required for being tracked, calculating the optical flow field set on each point, upon existence of the retrograde point set, finding out a tracking starting point corresponding to each point from the point set, and drawing up tracking paths; upon completion of tracking, when the amount of paths in a retrograde status is less than a decision threshold, judging rapid warning as a false alarm, otherwise, generating retrograde events. Tracking and precise warning are introduced into the method such that the accuracy rate of the retrograde detection is greatly improved.

The invention discloses an airborne adaptive transmission alignment algorithm for deflection deformation of an airfoil, and relates to the technical field of aerospace strap-down inertial navigation.The airborne adaptive transmission alignment algorithm includes calculating an initial position, a speed and attitude information of a sub inertial navigation according to an airborne main inertial navigation information to carry out an inertial navigation strap-down calculation; and adjusting an observation noise Rk according to a flying height to carry out the alignment calculation of the sub inertial navigation. The adaptive of a filtering algorithm is realized, and the environment adaptive capacity and the alignment precision of a speed plus attitude matching algorithm are effectively improved. The algorithm is simple to implement, reliable in operation, good in rapidness and adaptability, and has better engineering application value.

The invention discloses an electromechanical-coupling-oriented calculation method for the performance simulation confidence degree of an active phased array antenna. The method comprises the steps that influence factors of the performance of the active phased array antenna are determined; an antenna finite element model is established; temperature field analysis is conducted, and the confidence degree of thermal parameters is calculated; the confidence degree of the grid size is calculated based on a root-mean-square error of array surface temperature; antenna structural thermal deformation is calculated, and position offset of geometric center nodes of antenna units is extracted; the confidence degree of structural displacement extraction is calculated; an electromechanical coupling model is used for calculating electric performance of the antenna; the calculation result is compared with a calculation result obtained through electromagnetic simulation software, and the confidence degree of the electromechanical coupling model is calculated; the weighting coefficient is determined based on an analytic hierarchy process; a confidence degree calculation formula is established, and the performance simulation confidence degree of the active phased array antenna is calculated and finally determined. The antenna performance simulation confidence degree calculation method is established, and a judgment criterion is provided for the simulating calculation result of influences of structural thermal deformation of the active phased array antenna on electrical properties.

The invention relates to a multi-level equalizing resonance zero current soft switch DC-DC converter. The DC-DC converter is composed of a direct current equalizing capacitor group and two-port DC-DC resonance soft switch conversion units connected with capacitors in the direct current equalizing capacitor group. For the converter with a level number of (m+1) (m is an integer and is more than or equal to 2, similarly hereinafter), the direct current equalizing capacitor group is composed of m direct current equalizing capacitors (Cm, C<m-1>,..., C2, C1) in series connection from top to bottom in order, and the potentials of the capacitors (Cm, C<m-1>,..., C2, C1) in the direct current equalizing capacitor group decrease from top to bottom in order. The capacitors in the direct current equalizing capacitor group are connected with at least (m-1) two-port DC-DC resonance soft switch conversion units. The DC-DC converter achieves capacitance and voltage self-balancing, all the switch tubes and diodes achieve zero current switching, the two-port DC-DC resonance soft switch conversion units work without affecting each other and independently mutually, and the whole converter system has characteristics of structure modularization and simple control mode.

The invention relates to a multi-fault diagnosis method based on a correlation model. The method comprises the four steps of modeling the system correlation, obtaining a fault-test correlation matrixand a reduced correlation matrix, generating a multi-fault correlation matrix, and carrying out the multi-fault diagnosis, and comprises the steps that firstly, the system is modeled by relativity andthe fault-test correlation matrix is obtained; then, the correlation matrix is reduced according to the system test results, secondly, the logical OR operation is performed on each fault feature vector in the reduced correlation matrix to obtain the multi-fault correlation matrix; and finally, fault diagnosis is carried out based on multi-fault correlation matrix. Based on the correlation model and the test result, the invention can carry out multi-fault diagnosis on the system.

The invention discloses an air-gap asymmetrical switched reluctance linear motor magnetic path modeling method, particularly applicable to switched reluctance linear motors of various phase number structures and belongs to the field of switched reluctance linear motor establishing and control.The air-gap asymmetrical switched reluctance linear motor magnetic path modeling method is characterized in that a magnetic path model of an air-gap asymmetrical switched reluctance linear motor is formed by combining all calculation formulas of reluctance components in four magnetic paths at the active cell position xu where the central line of an active cell groove of the switched reluctance linear motor is aligned to the central line of stator teeth, the active cell position x0 where the front edges of active cell teeth are aligned to the front edges of the stator teeth, the active cell position x1/2 where the active cell teeth are overlapped with the stator teeth for one half of the width of the stator teeth, and the active cell position xa where the central line of the active cell teeth is aligned to the central line of the stator teeth without magnetic characteristic calculation performed by adopting a motor electromagnetic field finite element method.The method is quick in calculation, is suitable for the air-gap asymmetrical switched reluctance linear motors of various phase number structures, can achieve systematic and quick design, real-time simulation and real-time control of the air-gap asymmetrical switched reluctance linear motors and has a good engineering application value.

The present invention discloses a switch reluctance machine power converter correlation analysis and fault diagnosis method. The method collects the phase current information of the whole period of a switch reluctance machine power converter to take the mean value of the phase current signals as an opening fault characteristic quantity; and the phase current signals are moved to the same phase, and the obtained signals are subjected to denoising processing through the wavelet analysis. The correlation coefficients of the processed phase current signals in the related broken interval are configured to detect the short circuit faults and identify the fault phase; the correlation coefficients of the current signals in the phase opening interval are configured to locate the short circuit power device to complete the fault diagnosis of the power converter. The switch reluctance machine power converter correlation analysis and fault diagnosis method is suitable for switch reluctance machine power converters with a plurality of number of phases and a plurality of topological structures is accurate in diagnosis and good in engineering application values.

The invention discloses a power transmission line parameter identification method based on PMU (phasor measurement unit) data, and aims to solve the problem of power transmission line parameter identification based on the PMU (phasor measurement unit) data. Compared with a direct parameter calculation method based on the PMU data, the method can weaken the influence of measured noise and provide more real line parameter identification results. The method includes the steps: firstly, preliminarily processing the PMU measured data in a certain time period; secondly, identifying single sampled sections one by one based on a weighted least square method to further remove non-convergent invalid sections in single section identification; thirdly, performing multi-section parameter identification for remaining valid sections to finally obtain parameter identification results of a power transmission line. Power transmission line parameter identification based on the PMU data can be effectively realized, and the method has a good engineering application value.