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

The invention discloses a photovoltaic power station hot spot detection and positioning method based on a thermal infrared image. Pictures shot by a thermal imager carried by an unmanned aerial vehicle are infrared pictures, the resolution ratio is very low, the form of hot spots is usually very small, the accuracy of hot spot recognition is very low, and accurate positioning is difficult. Aimingat hot spot identification, the invention provides a UAV-YOLO model, a neural network residual error unit is added for fusion, characteristics of a front network are utilized to a greater extent, andhot spot characteristics of a far visual angle are learned; a YOLOv3 backbone network architecture is improved, and more hot spot appearance feature information can be learned in a front-end network.Aiming at hot spot positioning, the invention provides a geometric positioning algorithm, and the longitude and latitude of a hot spot are calculated through the longitude and latitude of an image center point, a yaw angle, the shooting height of an unmanned aerial vehicle and other information. According to the invention, the hot spot positioning precision is improved on the premise of ensuring the hot spot identification accuracy.

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 provides a disturbance compensation control method for a missile pilot, and relates to the field of guidance control. The method comprises the following steps: modeling by taking a missile as a controlled object, and designing a corresponding traditional attitude pilot; establishing a nonlinear kinetic equation set of the controlled object; considering the comprehensive interferencez3 to establish a state space standard form; obtaining an input and output result of the controlled object through a nonlinear kinematics equation set, and designing an extended state observer; feeding back the comprehensive interference z3 and the control gain b0 to the control output position of the traditional attitude driving instrument through the extended state observer to obtain the active-disturbance-rejection three-loop attitude driving instrument; and performing disturbance compensation control on the missile. The beneficial effects of the method are that: the structure and design parameters of the existing driving instrument are inherited, unmodeled disturbance and uncertain disturbance generated by parameter solidification and small disturbance hypothesis in the missile modeling process are estimated and compensated through the active disturbance rejection extended state observer, and comprehensive disturbance is fed back to the control output position through the extendedstate observer, so that attitude driverscope decoupling design is achieved.

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 belongs to the field of software safety engineering of aeronautic equipment complex software engineering, and discloses a risk indicator indexing matrix-based aeronautic equipment software importance grading method. Through combining characteristics of domestic aeronautic engineering and considering operability of practical engineering application, the risk indicator indexing matrix-based aeronautic equipment software importance grading method is put forward; and according to the method, two factors in are considered when system risk analysis is carried out: a system risk severity grade and a system risk software control grade. Risk importance is considered from two aspects: influence on system safety (casualties, equipment damage and environment destroy), and influence on mission functions (flight missions and operational missions), so as to provide basis for aeronautic equipment mission system software importance grading. The factor of risk occurrence possibility whichis difficult to calculate or assessment in engineering is not considered, so that the practicability and operability of engineering application are improved.

The invention discloses a tunnel secondary lining arch frame unit, an arch frame structure constituted by the same and an erection method of the arch frame structure. The tunnel secondary lining arch frame unit comprises at least three arch frame unit main ribs with the same length, the exteriors of all arc frame unit frames are fixedly connected into an arc frame unit framework through a plurality of stirrups, and the two ends of the arc frame unit framework are each fixedly connected with a piece of connection angle steel. The arch frame structure comprises a plurality of tunnel secondary lining arch frame units, all the tunnel secondary lining arch frame units are connected into an arc-shaped arch frame in sequence through bolts and nuts; the outer side of the arc-shaped arch frame is fixedly connected with outer layer of circumferential main ribs in a welded mode, and the inner side of the arc-shaped arch frame is fixedly connected with inner layer of circumferential main ribs in a welded mode; and a plurality of arch-shaped arc frames are arranged side by side in parallel at intervals to from an arch frame assembly. According to the tunnel secondary lining arch frame unit, the position of a double-layer reinforcing rib net of a tunnel secondary lining can be accurately positioned, and it is ensured that the concrete protection layer thickness of double layers of reinforcing ribs meets the design requirement, and meanwhile, the phenomenon that a waterproof plate is punctured can be effectively avoided.

The invention relates to a trussed type reinforced concrete beam, comprising a concrete beam body and a space truss arranged inside the concrete beam body, wherein the space truss is formed by combining four reinforced trusses, namely an upper reinforced truss, a lower reinforced truss, a left reinforced truss and a right reinforced truss, and the reinforced trusses are prefabricated. Compared with the prior art, the trussed type reinforced concrete beam disclosed by the invention has the advantages of convenience in construction, conservation of construction time and high overall strength.

The invention discloses evaluation equipment for a leakage and overflow monitoring device of a three-high gas well, and the equipment comprises a shaft module which comprises a sleeve and a drilling tool assembly penetrating into the sleeve, and the drilling tool assembly sequentially comprises a drill rod, a drill collar and a drill bit from top to bottom; the drilling fluid circulating module is used for enabling drilling fluid to circularly flow in the shaft module; the overflow simulation module is used for guiding the experimental gas into the shaft module; the well leakage simulation module is used for exporting the drilling fluid out of the shaft module; the to-be-evaluated monitoring device is connected to the drill collar; and the data acquisition and analysis module is in communication connection with the to-be-evaluated monitoring device, the overflow simulation module and the well leakage simulation module. The invention further discloses an evaluation method of the three-high gas well leakage and overflow monitoring device. The working conditions of well leakage and early overflow are simulated, the underground overflow monitoring device is evaluated, basis and support are provided for development of the overflow monitoring technology, and blowout accidents caused by missing of the optimal well control opportunity are reduced.

The invention discloses a control method for accessing a modular multilevel converter (MMC) station to a DC power grid and a controller. The method comprises the steps of charging a first sub-modularof the MMC station by an AC source of the MMC station; judging whether capacitance voltages of all first sub-modules are raised to rated working voltage or not; charging a DC/DC converter by the charged MMC station when a judgment result is yes; judging capacitance voltages of all sub-modules of the DC/DC converter are raised to the rated working voltage or not; and connecting a first DC side of the DC/DC converter and a DC power grid to be accessed when a judgment result is yes, and controlling a transmission power of the DC/DC converter so that the transmission power is raised to rated transmission power of the DC/DC converter. By ordered charging control of the MMC station and the DC/DC converter, employed by the embodiment of the invention, an impact current of the MMC station accessedto the DC power grid can be effectively reduced, so that the MMC station is easily and smoothly accessed to the DC power grid.

The invention provides an intelligently-controlled open type compression absorption heat pump system for water and waste heat recovery. An outlet of a gas pipeline is connected with a contact heat exchanger, a circulating solution pump I is arranged on a pipeline between an absorber and a solution heat exchanger, and a circulating solution pump II is arranged on a pipeline between a regenerator and the solution heat exchanger; and a temperature and humidity and/or pressure sensor is arranged at a gas outlet at the upper portion of the contact heat exchanger and used for detecting the temperature and humidity and/or pressure of exhausted gas, and the circulating solution pump I, the circulating solution pump II and the temperature and humidity and/or pressure sensor are in data connection with a controller. The controller automatically adjusts the compression power of the circulating solution pump I and the circulating solution pump II according to the detected temperature and humidity and/or pressure, so that the flow of absorption solutions entering the absorber and the regenerator is adjusted to meet the requirements of water vapor absorption and solution regeneration in gas, and the moisture content parameter of the gas outlet is further changed. The power of the circulating solution pump I and the power of the circulating solution pump II are controlled through the temperature and pressure of outlet gas of the contact heat exchanger, the flow of the solutions entering the absorber and the regenerator can be guaranteed, and then the absorption and regeneration effects are adjusted; and finally, the temperature and pressure parameters of the gas in the contact heat exchanger and the absorber are kept in a relative balance state, and the system has extremely high engineering practical significance.

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 a 10ns 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 requests to protect a medical image automatic labeling method and system based on small sample segmentation, and aims to solve the problems that a large amount of labeled data is needed for medical image segmentation, the process of labeling new data is tedious and single, but a large amount of manual labeling work is needed, and the cost of a data set is increased. On the basis of a small sample segmentation technology, an automatic annotation network structure Siamese-DCNet is provided, a double-branch structure is utilized, a query branch and a support branch are included, features of an unannotated image and features of an annotated image are extracted preliminarily, and by means of a result obtained by the double branches and in combination with known annotations, unimportant information except the annotation is removed; a preliminary annotation is predicted by calculating cosine similarity and is input into an iterative optimization module, and a final annotation result is obtained through refining of several iterations. According to the method, automatic annotation of all other images in the same scene can be realized only by a small number of images with annotations.

The invention discloses an online detection method of transformer winding deformation based on vibration. A PC processing module, a data acquisition instrument, a signal conversion interface, a current transformer and vibration sensors are comprised. The vibration sensor and the current transformer are connected to the signal conversion interface and the data acquisition instrument. Vibrators are distributed at the surface of the oil tank of a transformer. The data acquisition instrument collects vibration signals detected by the vibration sensors and transmits the vibration signals to the PC processing module. A PC processes, calculates and stores the collected vibration signals and current value and carries out judgment of a winding deformation degree. According to the amplitudes of the vibration signals and change characteristics with the winding deformation degree of the transformer, and 100Hz to 600 Hz signals in the vibration signals are used to judge the transformer winding deformation. According to the method, the real-time online monitoring of the transformer winding deformation can be realized, the vibration signals are sensitive to the winding deformation, and the method is easy to popularize and apply.

The invention provides a method and device for enabling an MMC station to access a DC power grid. The method comprises the following steps: when the MMC station is in a locking state, utilizing an AC power supply system to supply power for capacitors; connecting the AC system with a negative pole DC line of the DC power grid to charge the capacitor of a first bridge arm; connecting the AC system with a positive pole DC line of the DC power grid to charge the capacitor of a second bridge arm; and increasing the number of switch device submodules accessed in the first bridge arm and/ or the second bridge arm to match the DC voltage of the DC power grid, and enabling the MMC station to access the DC power grid successfully. By closing DC isolation switches connected with an isolated MMC station and controlling to increase the number of the bridge arm submodules during unlocking, surge current obtained at the moment when each switch is closed and the moment when the isolated MMC station is unlocked is allowed to be small enough so as not to cause influence on the normally-operating DC power grid; and the method is an effect method for allowing the isolated MMC station to access the DC power grid online smoothly.

The invention discloses a temperature sensor assisted GNSS-R (Global Navigation Satellite System-Reflection) soil moisture detection device. The device is composed of an antenna, a GNSS reflecting signal receiver module, a soil component setting module, a soil temperature detection and judging module and a soil moisture inversion module, wherein the antenna is connected with the GNSS reflecting signal receiver module, and located at the front end of the GNSS reflecting signal receiver module; the GNSS reflecting signal receiver module is connected with the soil moisture inversion module and located at the front end of the soil moisture inversion module; the soil component setting module and the soil temperature detection and judging module are respectively connected with the soil moisture inversion module, the treatment processes are in front of the soil moisture inversion module, and the soil moisture inversion module is sued for receiving output results of the GNSS reflecting signal receiver module, the soil component setting module and the soil temperature detection and judging module as input parameters so as to perform inversion of soil moisture. The device disclosed by the invention has application prospects in the technical field of soil moisture measurement.