12results about How to "Reduce engineering difficulty" patented technology

The invention provides a parking path planning method and device, a storage medium and an electronic device, and the method comprises the steps: determining the parking direction of a vehicle, and obtaining the environment perception information of the vehicle before parking; a path end point channel of the vehicle is calculated according to the parking-out direction and the environment perception information, and the path end point channel corresponds to the distribution range of path end points of a parking-out path of the vehicle; and planning a parking path meeting a collision constraint condition based on the path end point channel. According to the embodiment of the invention, the technical problem of low flexibility of planning the parking path of the vehicle in related technologies is solved, the flexibility of planning the parking path is improved, and the planning success rate of the parking path is also improved.

The invention provides an iron ore deep hole downward fan-shaped hole arrangement mining method which comprises the following steps: step 1, performing stope arrangement, arranging an upper vein-following transportation roadway and a rock drilling chamber at the upper part of a stope for ore transportation and drilling operation, and arranging a lower vein-following transportation roadway, an ore removal gate roadway and an ore loading access road at the lower part of the stope for ore transportation and loading; 2, cutting transverse roadways and cutting wells, correspondingly arranging bottom and top cutting transverse roadways at the center or the end part of the stope to form a blasting free surface, digging the cutting wells in the hanging wall of the ore body, and penetrating through the bottom and top cutting transverse roadways to provide a space for blasting operation; and thirdly, fan-shaped deep holes are arranged, and the downward fan-shaped holes of the deep holes are formed in the chamber to replace original vertical hole arrangement mining, so that the method can better adapt to the geological conditions, the mining efficiency is improved, a larger ore body area can be covered, the ore collection rate is improved, and the mining cost is reduced.

The application discloses a water pump performance curve correction method based on a similarity principle, relates to the technical field of water pump working condition analysis, and comprises the following steps: acquiring a conversion working condition point corresponding to a model pump test working condition point converted to a prototype pump and a theoretical performance curve of the prototype pump; confirming a similarity parabola passing through the field measured working condition point and mapping the similarity parabola to the theoretical performance curve of the prototype pump to obtain an intersection point as a similarity working condition point of the field measured working condition point according to a similarity parabola relationship and field measured working condition point data; obtaining a corresponding point under a theoretical rotating speed according to the similarity relationship and combining the working condition point on the theoretical curve of the prototype pump; replacing the theoretical rotating speed with a measured rotating speed, converting to a corresponding point under a rated rotating speed, and fitting to obtain an actual flow-head curve; and acquiring a theoretical efficiency value and an optimal efficiency value corresponding to the similarity working condition point to obtain an actual flow-efficiency curve, so that the actual performance curve of the prototype pump can be efficiently and accurately corrected.

The utility model relates to the technical field of water tanks, and discloses a modularized water tank. The technical problems that in the prior art, the capacity of an integral box body is fixed, flexible adjustment is inconvenient to conduct according to actual requirements, and meanwhile installation, carrying and maintenance are difficult are solved. The water tank assembly comprises a plurality of spliced water tanks, at least one side surface of each water tank is provided with a hole site, the hole site is pre-embedded with a thread of a steel plate bolt, other side surfaces of each water tank are provided with a boss or a limiting clamping groove for accommodating the boss, and each water tank is provided with at least one water inlet and at least one water outlet. The modularized water tank integrates the functions of convenient modularized installation, efficient automatic cleaning, all-around spraying cleaning, accurate liquid level monitoring and the like, the comprehensive performance and the use experience of water tank equipment are greatly improved, and the modularized water tank has very high practical value and popularization prospects.

The invention discloses a method for achieving multiple purposes of a ground gas pre-pumping well in a coal face, and belongs to the technical field of coal mine area gas extraction, goaf filling and CO2 goaf storage. A plurality of ground gas extraction wells are constructed in a coal face to pre-extract coal seam gas, before the working face is extracted to the positions of the gas pre-extraction wells, perforation is conducted on a sleeve section within the mining disturbance range, and after pipe cutting and plugging are conducted on an underground gas pre-extraction coal seam section, negative pressure extraction is conducted on a pressure relief coal seam and goaf gas; after the working face goaf is completely formed and sealed, coal gangue and fly ash mixed paste and CO2 are injected into the goaf and the mining disturbance space at high pressure through the well, and efficient linkage of coal face gas pre-extraction, pressure relief coal seam and goaf gas extraction, goaf filling and goaf CO2 mineralization and storage is achieved. According to the method, the coal face gas pre-pumping well can be used for multiple purposes, the comprehensive cost of gas pre-pumping, pressure relief, goaf gas extraction, goaf filling and coal gangue treatment is reduced, and the method has safe, environmental and social benefits.

The invention discloses a direct current conversion device for series offshore wind power direct current collection and a working method thereof, the direct current conversion device comprises a plurality of sub-modules, the input ports of the sub-modules are mutually independent and are connected with the output port of a direct current fan, and the output ports are cascaded at a high-voltage direct current side; a power balance branch is connected between the middle points of the secondary full-bridge circuits of the two adjacent sub-modules, and a fault isolation unit is connected in series between the two adjacent sub-modules on the high-voltage direct current side; wherein each sub-module comprises a primary side full-bridge circuit, a secondary side full-bridge circuit and a high-frequency transformer connected between the primary side full-bridge circuit and the secondary side full-bridge circuit, an input capacitor is connected between the primary side full-bridge circuit and the input port, an output capacitor is connected between the secondary side full-bridge circuit and the output port, and the input port is connected with an unloading branch in parallel. According to the invention, unbalanced power processing, on-line switching and fault isolation in series collection of offshore direct-current fans are realized.

This utility model discloses a pile splicing structure for construction, relating to the field of building construction technology. It includes a first pile body and a second pile body, with a guide assembly installed between the first and second pile bodies. The guide assembly includes two guide rods symmetrically distributed. The top of the first pile body has a recessed groove for the guide rods to slide, and the bottom of the second pile body has a positioning groove for the guide rods to insert into. A compression spring elastically connects the guide rods and the recessed grooves. This utility model, through the difference in radius between the guide rods and the positioning grooves in the guide assembly, enables the insertion of one guide rod into the positioning groove in the shortest possible time, thereby limiting the axis of motion of the second pile body during connection. This reduces the engineering difficulty of connecting the first and second pile bodies, thus improving the efficiency of splicing the first and second pile bodies.

The present invention discloses a low-carbon road line selection method based on a minimum road impedance model, comprising: obtaining an elevation grid data layer of a study area; obtaining a Chinese land carbon sink grid data layer, and obtaining the study area carbon sink grid data layer by clipping; standardizing the elevation grid data layer to obtain a surface elevation resistance surface; standardizing the study area carbon sink grid data layer to obtain a land carbon sink resistance surface; weightedly superimposing the resistance value corresponding to the surface elevation resistance surface and the resistance value corresponding to the land carbon sink resistance surface to obtain the cost grid data of the study area; determining the starting point and the end point of the planned route on a highway traffic map of the study area; analyzing the cost distance and the cost path between the starting point and the end point according to the cost grid data, the coordinate information of the starting point and the coordinate information of the end point, and obtaining the minimum cost path between the starting point and the end point. The present invention provides a scientific basis for solving the problems existing in the manual line selection method.

The invention provides a methanol-natural gas dual-fuel collaborative combustion system and method.The methanol-natural gas dual-fuel collaborative combustion system comprises a dual-fuel supply subsystem, a turbulent burner set, a heating surface collaborative subsystem, a flue gas purification and air induction subsystem and a DCS closed-loop control subsystem; the method has the beneficial effects that collaborative optimization of main steam temperature increasing and carbon emission reducing is achieved, through methanol-natural gas dual-fuel collaborative combustion, the characteristics of high oxygen content, high latent heat of vaporization and radiation of methanol fuel are fully utilized, and the main steam temperature is effectively increased on the premise that the structure of a boiler heating surface is basically not changed; meanwhile, emission is reduced due to the low-carbon property of methanol, and unification of efficient operation and low-carbon emission is achieved.

The utility model discloses a track extension structure of a maglev line, a maglev terminal station of the maglev line is adjacent to a fixed building, an in-station track structure of the maglev terminal station is a single-line track, the end of the single-line track faces the fixed building, an out-station track structure of the maglev terminal station is a double-line track, and the end of the double-line track faces the fixed building. One first track in the double-track track is connected with the single-track track, the end of the other second track in the double-track track is connected with the single-track track through a transition line, and the first track is further provided with a first extension track in a leading-out mode through a first turnout; and the second rail is provided with a second extension rail through a second turnout in a leading-out manner. The track extension structure of the maglev line can achieve the function of track traffic extension, can reduce the engineering difficulty, reduces the influence on a maglev station and nearby fixed buildings, and is short in construction time, low in construction difficulty and low in construction cost.

A fast reactive current control method and system for converters based on centralized sampling on the grid side is proposed. Based on the spectral characteristics of composite harmonics, a clustering method is used to obtain the cluster center harmonic frequency bands of multiple frequency bands. The resonant peaks are determined based on the principle that each resonant peak covers two adjacent cluster center harmonic frequency bands. The reduction ratio of the delay time in the repetitive controller is determined based on the frequency of each resonant peak and the fundamental frequency, resulting in an improved fast repetitive controller. The delay element in the feedback branch of the improved fast repetitive controller is decomposed into an integer-order delay element and a fractional-order delay element connected in series. The fractional-order delay element is compensated to obtain a compensated fast repetitive controller. The fast repetitive composite controller obtained by connecting the compensated fast repetitive controller in parallel with a PI controller serves as the improved current inner loop. Based on the voltage outer loop and the improved current inner loop, fast reactive current control is achieved, realizing rapid reactive current compensation.

In the AI training and detection method for identifying the cell-derived species, a microscopic examination sample image A comprises a cell type A image of a species A; the microscopic examination sample image B comprises a cell type B image of a species B; annotating the cell type A image to obtain a cell type annotated image A of the species A; annotating the cell type B image to obtain a cell type annotated image B of the species B; carrying out AI training by using the cell labeling image A and the cell labeling image B to obtain an AI species cell characteristic data set; and the AI species cell characteristic data set is combined with the corresponding AI algorithm module, and has the capability of identifying and distinguishing the cells of the species A and the cells of the species B. The microscopic examination sample image is recognized through an AI recognition algorithm, and cell source species in the sample are recognized through the AI recognition algorithm according to the AI species cell feature data set; the AI species cell characteristic data set is obtained by training labeled cell pictures, and the cell pictures are derived from two or more species.