6results about How to "Reduce engineering difficulty" patented technology

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 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 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.

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.