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 problem of division of the optimal islands of the distribution system containing distributed generation.

The invention discloses a method for calculating parameters of a duplex winding power transformer. A method for traversing transformer tap gears is adopted, through voltages on the primary side and the secondary side of the transformer in a short time window and on-line measured data of active power and reactive power, parameters of an equivalent circuit of the transformer and actual motion gears of the transformer tap are calculated. Through the use of the method, the iteration is not required in the calculating process; the method has the advantages that the operand is less, the calculating speed is high, and the calculation accuracy completely meets actual project requirements.

The invention discloses a tracking arc segment computing method on a grounding moving target by an IGSO satellite. The defect that an analysis method for the target tracking capacity by a GEO satellite in the traditional communication task is unsuitable for the satellite communication link analysis of the IGSO satellite is solved, the continuous tracking capacity on the ground moving target by theIGSO satellite is analyzed under the condition of satisfying the ground elevation constraint, satellite antenna angle constraint and target narrow-beam antenna constraint, and the method conforms toan actual engineering use requirement for performing satellite-ground communication by utilizing the IGSO satellite.

The invention relates to a method of preparing a concrete building material by utilizing high-silicon type iron tailings. The method comprises the following steps: recycling and storing the high-silicon type iron tailings; detecting the ingredients of the tailings; performing mechanical chemical activation, grain size analysis and activity analysis on the obtained tailings; mixing the tailings obtained by processing with sand, stones, cement and water according to a certain proportion; and utilizing a normal-temperature solidifying and molding technology to prepare the prepared mixture into the concrete building material with various technical performance indexes capable of meeting the practical needs of the engineering. The method of preparing concrete building material by utilizing high-silicon type iron tailings disclosed by the invention can be used for increasing the utilization force of the high-silicon type iron tailings and improving the current situation that the recovery rate of the existing tailings is not high.

The invention provides a sonar-based improved fuzzy artificial potential field unmanned ship obstacle avoidance method and belongs to the technical field of unmanned underwater vehicles. According tothe prior art, an unmanned underwater vehicle adopts a traditional artificial potential field obstacle avoidance method, and as a result, the unmanned underwater vehicle fails to arrive at a target, and the problem of local minimum values will be brought about. The invention aims to eliminate the above defect and solve the problem in the prior art. The method comprises the following steps that: the data of the upper computer of a ground station are initialized; the position information of an obstacle surrounding an unmanned ship is acquired through a sonar ranging module; the minimum course angle of a combined potential field is calculated based on an improved artificial potential field algorithm; on the basis of the improved artificial potential field algorithm, a two-dimensional fuzzy control module is constructed through a triangular membership function, so that the next position of the unmanned ship can be determined. The method has the advantages of simplicity, high practicabilityand wide application. A TriTech micromachine is adopted to scan sonar detection obstacles, so that the method further has the advantages of low cost and low power consumption. The method is based onthe artificial potential field method, and the principle of the artificial potential field method is simple and easy to understand; and after fuzzy control is adopted, the course angle change of the unmanned ship tends to be smooth.

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 optimal island dividing calculation method of a distributed power distribution network. According to the method, at the step three, evaluation function calculation and optimal island searching are carried out, so that the space complexity is reduced; on the basis of combination of an inclusion-exclusion principle, state simplification is carried out on a combination optimization problem, so that the problem is completed in polynomial time; and solution is completed in time and polynomial space, so that the computing speed is increased. The method has the following advantages: an improved dynamic programming algorithm is put forward to carry out island division solution; a reasonable plan islanding scheme can be calculated quickly and accurately; the maximum powersupply recovery is taken as an objective and the importance of load is considered comprehensively; the problem solving speed and precision are improved effectively; and an important scientific basisis provided for dynamic planning of a distribution network.

The invention belongs to the technical field of aircraft system design and particularly relates to a flexible compensation connection structure of an asymmetric spray pipe and an engine. The structurecomprises a convergent extension section and an L-shaped retaining ring; the convergent extension section is provided with a first end and a second end, the first end of the convergent extension section is connected to an outlet end of the engine, and the convergent extension section converges from the first end to the second end away from the outlet end of the engine; the L-shaped retaining ringis provided with a first end and a second end, the first end of the L-shaped retaining ring is connected to an inlet end of an exhaust pipe, and the convergent extension section is sleeved with the L-shaped retaining ring; and the second end of the L-shaped retaining ring and the second end of the convergent extension section cross each other in an axial direction, and a gap is formed in a radialdirection. According to the flexible compensation connection structure of the asymmetric spray pipe and the engine, a soft connection between the asymmetric spray pipe and an engine body during testand installation is realized, excessive non-axial force and bending moment on the spray pipe are prevented from being transmitted to an engine structure, the structure is simple, realization is easy,and actual engineering requirements are met.