30results about How to "Meet the actual engineering requirements" patented technology

The invention relates to an intelligent distribution network and new energy. The invention provides a method for forming islands of a distribution system containing distributed power supply in order to overcome the defects in the prior art. The invention adopts the following technical scheme: firstly adopting the building and merging processes of the islands containing a plurality of tree knapsack problems (TKP) to obtain the initial island division scheme; and then correspondingly analyzing and adjusting the initial islands to obtain the final island scheme, wherein obtaining the initial island division scheme refers to solving TKP by the branch and bound algorithm, which comprises the following processes: firstly solving the critical item of TKP and then finding out the upper bound of TKP in the polynomial time, namely computed time complexity O(n2), by adopting lagrangian relaxation, wherein n is the total number of nodes. The method is mainly applied to rapidly solving the problemof division of the optimal islands of the distribution system containing distributed generation.

The invention belongs to a design technology for an airplane accessory, and relates to a method for determining upper limit of environmental temperature in a nacelle. The method comprises the following steps of: acquiring temperature on the surface of an engine crankcase through experiments; determining atmospheric environmental temperature for working of an airplane; measuring sectional radiuses of an engine and the nacelle according to data models or real objects of the engine and the nacelle; and finally, performing numerical fitting calibration to obtain an empirical formula according to a thermodynamic principle, aerodynamics and working characteristics of a ventilating and cooling system of the nacelle of the airplane by combining actual test and engineering experience and calculating to obtain the upper limit of the environmental temperature in the nacelle. The method has the advantages of easiness, convenience, easiness for implementation, high accuracy and capability of meeting actual engineering requirements.

The invention discloses a visualization testing device for simulating soil body displacement of underwater open caisson construction and a method. The device comprises a seepage force application system, a working condition simulation system, a data collection system and an excavation simulation device. By fusing a transparent material technology and a digital image processing technology, the device is applied to indoor simulation of underwater open caisson construction, and visualization observation of a soil body displacement field and a seepage field in underwater open caisson constructionis achieved.

The application belongs to the technical field of aircraft system design, and in particular relates to a flexible compensation connection structure between an asymmetrical nozzle and an engine. Includes: convergent extension and L-ring. The convergent extension has a first end and a second end, the first end of the convergent extension is connected to the engine outlet, and the convergent extension extends from the first end to the second end away from the engine outlet. end convergence; the L-shaped retaining ring has a first end and a second end, the first end of the L-shaped retaining ring is connected to the inlet end of the exhaust pipe, and the L-shaped retaining ring is sleeved on the convergent extension Outside, the second end of the L-shaped retaining ring and the second end of the converging extension section cross each other in the axial direction, and there is a gap in the radial direction. This application realizes the soft connection between the asymmetrical nozzle test and the engine body during installation, avoiding the transmission of excessive non-axial force and bending moment on the nozzle to the engine structure, the structure is simple, easy to implement, and can meet the requirements of actual engineering Require.

The invention provides an improved fuzzy artificial potential field obstacle avoidance method for an unmanned ship based on sonar, which belongs to the technical field of unmanned underwater vehicles and aims to solve the problem of using traditional artificial potential field obstacle avoidance methods for existing unmanned underwater vehicles. The target unreachability problem and the local minimum problem. The method of the present invention includes: initializing the data of the upper computer of the ground station; using the sonar ranging module to obtain the position information of obstacles around the unmanned ship; based on the improved artificial potential field algorithm, calculating the minimum heading angle of the resulting potential field; On the basis of the improved artificial potential field, the two-dimensional fuzzy control module constructed by the triangular membership function is used to determine the next position of the unmanned ship. The effect is that the present invention has the characteristics of simplicity, practicality and wide application. The use of TriTech micro-mechanical scanning sonar to detect obstacles has the advantages of low cost and low power consumption. The artificial potential field method is used as the basis to make the principle simple and easy to understand. Combined with fuzzy control, the course angle of the unmanned ship can be smoothed.

The invention discloses a miniaturized phase frequency tester. The miniaturized phase frequency tester comprises a digital sampling module and a data processing module; the digital sampling module isused for synchronously sampling a modulation signal generated by a signal source and an intermediate frequency signal passing through a transponder channel to obtain two differential digital signals,wherein the two differential digital signals comprise a modulation sampling signal and an intermediate frequency sampling signal; and the data processing module is used for conducting phase estimationon the two differential digital signals to obtain phase estimation values and conducting phase comparison on the phase estimation values to obtain phase frequency testing data. According to the miniaturized phase frequency tester, phase frequency testing is completed by means of an embedded software platform through a digital phase comparison mode, signal acquisition equipment and signal processing equipment in the prior art are integrated into one, miniaturization of testing equipment is achieved, and the testing efficiency is improved.

The invention discloses an optical signal time-to-space conversion device and method. The device comprises several same reflectors with diameters of d, a laser source system for producing parallel light, a spatial light modulator and a light splitting prism. According to the number of light paths needing to be output in parallel, a reflector system composed of the several reflectors is designed and a light path is built and debugged. The parallel light produced by the laser source system goes through the light splitting prism, then irradiates the spatial light modulator loaded with serially-transmitted data, and is modulated by the spatial light modulator so that the parallel light is loaded with the serial data. The parallel light reflected by the spatial light modulator goes through the light splitting prism again and then goes into the reflector system and the parallel light going through the reflector system is in a parallel data transmission mode.

The invention discloses a controllable serial capacitor optimal configuration method capable of improving available transmission capacity, which is characterized in that: the position variables and compensation degrees of TCSCs serve as antibody genes to be coded, initial data are input to generate initial populations randomly, and the initial populations are divided into an open crossover and mutation rates are set for the populations of each group, each group of populations are optimized by an immune algorithm, the affinity between each antibody and an antigen in each population in each group is calculated, and clonal selection, clonal amplification, crossover and variable immunity are performed; at the end of the evolution of each generation, a communicating operator is used to allow the populations to interexchange part of antibodies and the affinity is calculated; after the evolution of a plurality of generations, the currently optimal antibodies are distributed into all populations by a transmission operator; and after all populations evolve for one time, if an algorithm meets convergence conditions is judged, and optimal results are output if the algorithm meets the convergence conditions, or immune supplementation is performed and evolution circulation is returned to if the algorithm does not meet the convergence conditions. The method can solve the optimal configuration problem of the plurality of TCSCs.

The present invention provides a method for analyzing the arcs covered by IGSO satellites to the region based on feature points. The process is: according to the given initial moment and orbital parameters, and setting the time step, calculating each interval time step in the specified time period. The position of the satellite corresponding to the time in the geocentric inertial system; according to the given target area, determine its corresponding marker point; judge whether the IGSO satellite can cover the target area at each time step in the specified period , record the corresponding time that can be covered, and form a coverage arc according to the recorded time; whether the IGSO satellite can cover the target area is: according to the satellite position, calculate the critical opening angle corresponding to each marker point and the satellite opening angle to judge, when When there is a marker point that is invisible to the IGSO satellite, it is considered that the IGSO satellite cannot cover the target area at the corresponding moment. According to the obtained IGSO satellite coverage arc, guide the subsequent practical engineering application of using IGSO satellite for satellite-ground communication.