38results about How to "Strong engineering practice" patented technology

The invention relates to an economic and practical unmanned aerial vehicle (UAV) lifespan assessment method characterized in that: based on the characteristics of low itself safety requirements and no casualties of an UAV, the statistical data of maintenance support of the UAV is analyzed to determine key components of an unmanned aerial vehicle (UAV) body structure; base load spectrum of the key components can be determined by flight simulation and flight monitoring data, the cumulative fatigue damage of the key components can be determined by small amount of fatigue tests; and finally, according to simulated and monitored mission profile load spectrums, unit voyage damage coefficients of each mission profile of the components can be determined to obtain the flight number and voyage affordable by each key component, and a minimum value is selected as the fatigue lifespan of the unmanned aerial vehicle (UAV) body structure. The beneficial effects of the economic and practical unmanned aerial vehicle (UAV) lifespan assessment method are that: the complex modeling is abandoned, the flight monitoring data is made full use, the calculation is convenient, the economic benefit is obvious, the operation method is simple, practical and strong in engineering practicality, and the lifespan of the unmanned aerial vehicle (UAV) body structure can be accurately predicted and evaluated.

The invention discloses an online monitoring method of pulse injection type line oscillation, which belongs to the field of online monitoring of overhead transmission lines of an electric system, and relates to a pulse injection-based research method for the online monitoring of the overhead transmission lines of the electric system. The method mainly comprises the following steps of: injecting a10ns pulse signal from the tail end of a capacitive voltage transformer; transmitting the pulse signal on an extra-high voltage line, wherein when the line generates low-frequency oscillation along with wind, the capacitance of the line is changed, then the wave impedance is changed to make the pulse signal along the line generate corresponding fluctuations; and according to the signal fluctuations, judging the position of the line oscillation, the oscillation frequency, the oscillation amplitude value and the like. The research method is relatively novel, is reasonable in design, is easy to implement, and has wide popularization and research values in the field of the online monitoring of the overhead transmission lines of the electric system.

The invention discloses a real-time GPS-based short-term dynamic dispatching method for public transport, comprising the following steps: determining the maximum line distance maxdis of two adjacent buses on the current line according to real-time GPS data, and determining Line balance coefficient λ; where the main station and auxiliary station are regarded as virtual buses to participate in determining the maximum line distance between two adjacent buses; the current line balance coefficient λ and the two preset thresholds α 1 , α 2 For comparison, when λ≤α 1 When , no adjustment is made; when α 1 <λ≤α 2 When , readjust the subsequent departure interval; when λ>α 2 , adding vehicles from the main station; the threshold α 1 The value is the line balance coefficient when the bus on the current line runs in an ideal state according to the scheduling plan and satisfies 0<α 1 <α 2 <1.

The invention discloses an αβ detection method for grid voltage drop. By fabricating single-phase system voltage signals and using the space vector superposition principle, the currently commonly used grid voltage drop detection algorithm αβ detection method is improved, so that The delay time of the above method is further shortened. Under the condition of power frequency, compared with the theoretical delay time of αβ detection method of 5ms, the theoretical delay time of the present invention is 0.83ms, the actual delay time is only 0.9375ms, and the real-time performance is greatly improved. The invention adopts the single-phase voltage signal to fabricate a multi-phase system, thereby reducing the number of AC voltage sensors and reducing the cost. The algorithm of the invention is simple, practical, good in dynamic performance, and has strong engineering practical effect.

The invention provides an intelligently controlled open compression absorption heat pump system for recovery of water and waste heat. The outlet of the gas pipeline is connected to a contact heat exchanger. A circulating solution pump II is installed in the pipeline between the heat exchanger and the solution heat exchanger; a temperature, humidity and / or pressure sensor is installed at the gas outlet on the upper part of the contact heat exchanger to detect the temperature, humidity and / or pressure of the discharged gas, and the circulation The solution pump I, the circulating solution pump II, temperature and humidity and / or pressure sensors are connected to the controller for data, and the controller automatically adjusts the compression power of the circulating solution pump I and the circulating solution pump II according to the detected temperature, humidity and / or pressure , so as to adjust the flow rate of the absorption solution entering the absorber and regenerator to meet the requirements for water vapor absorption and solution regeneration in the gas, and then change the moisture content parameter of the gas outlet. The present invention controls the power of the circulating solution pump I and the circulating solution pump II through the temperature and pressure of the outlet gas of the contact heat exchanger, so as to ensure the flow of the solution entering the absorber and the regenerator, and then adjust the absorption and regeneration effects, and finally make the The temperature and pressure parameters of the gas in the contact heat exchanger and the absorber maintain a relatively balanced state, which has strong engineering practical significance.

The invention claims a method for detecting and locating hot spots of photovoltaic power stations based on thermal infrared images. The pictures taken by drones equipped with thermal imagers are infrared pictures with very low resolution, and the shape of hot spots is usually very small, resulting in very low accuracy of hot spot identification and difficult to accurately locate. For hot spot recognition, the present invention proposes the UAV-YOLO model, adds neural network residual units for fusion, makes use of the features of the front network to a greater extent, and learns hot spot features from farther perspectives; improves the YOLOv3 backbone network architecture , more feature information of hot spot appearance can be learned in the front-end network. For hot spot positioning, the present invention proposes a geometric positioning algorithm, which calculates the longitude and latitude of the hot spot through information such as the longitude and latitude of the image center point, the yaw angle, and the shooting height of the drone. The invention improves the positioning accuracy of the hot spot on the premise of ensuring the accuracy of the hot spot identification.

The invention discloses a method for on-line monitoring of cable insulation through reverse injection of low-frequency signals. Low-frequency voltage signals are injected through the open triangle side of an electromagnetic voltage transformer connected to a busbar, and windowed interpolation improved by Fast Fourier is used. The algorithm processes the current signal of the collected cable ground wire and the voltage signal of the cable core to obtain the low-frequency dielectric loss factor of the cable, and judge the aging degree of the cable, so as to realize the active online monitoring of cable insulation aging.

The invention discloses a scribing machine. The scribing machine comprises a frame unit as well as a power unit, a power supply unit and a spraying unit which are mounted on the frame unit and is characterized in that a position correction unit and a control unit are arranged on the frame unit; the position correction unit comprises a camera unit, a first driving motor, a driving sliding table anda coupler, the camera unit is mounted at the bottom of the frame unit and used for acquiring the position image of a datum line, and the control unit acquires the position of the datum line by processing the acquired image; when the position of the scribing machine deviates, the control unit controls the first driving motor to drive the driving sliding table to perform slider motion via the coupler, and the spray position of the spraying unit is driven to move leftwards and rightwards through motion of the driving sliding table.

The invention discloses a method for accurately extracting a bus traveling path based on a bus traveling path, which comprises the following steps: firstly, data filtering processing is carried out onthe bus traveling path data collected on a certain line through a track filtering algorithm; and secondly, the bus traveling path data is extracted from the bus traveling path data. Then, the filtered trajectory is fused into one trajectory by multi-trajectory fusion algorithm. After that, a route of the bus route is obtained by using the route-grasping service of Gaud map to correct the route deviation of the merged route. Finally, a precise route on the bus line is obtained by correcting the offset of the primary and secondary stations of the corrected route through the path fusion algorithm of the starting and terminating points. The method fully considers many factors such as GPS signal drift and inaccurate positioning of the bus, and shows how to filter, fuse and correct the data ofthe bus operation trajectory, so as to make the extracted bus travel path more realistic, reliable and accurate.