8results about How to "Solve design problems" patented technology

The application provides an inverter structure analysis optimization method, system and electronic equipment. The method comprises: obtaining structure data and air-tightness parameters; obtaining explosion pressure data; coupling analysis is performed on the air-tightness and explosion-proof performance of the inverter based on the structure data, air-tightness parameters and explosion pressure data, and the to-be-optimized region of the shell structure is determined according to the analysis result of the coupling analysis, wherein the to-be-optimized region is divided into an air-tightness optimization region and an explosion-proof optimization region; in response to the existence of the to-be-optimized region of the shell structure, the part of the structure corresponding to the to-be-optimized region is optimized and adjusted based on a preset optimization strategy, so as to update the inverter. The dual simulation coupling analysis can be used for air-tightness testing and explosion-proof testing and targeted improvement, the structure optimization design cycle is shortened, and the accurate air-tightness requirement under different IP levels is met, so that the optimal explosion-proof pressure relief effect is realized while the air-tightness performance is ensured.

This invention provides a DC active filter device based on square wave modulation. The device includes: at least one independent DC active filter unit; each DC active filter unit is connected in parallel across the two ends of a DC bus; each DC active filter unit includes: a measurement circuit that measures the ripple current of the DC bus; a control circuit that calculates the frequency components of the ripple current and then obtains a switching signal through square wave modulation, the frequency of which is equal to the target frequency of the ripple current to be compensated; and a drive circuit that sends the switching signal to the main power circuit, causing the switching devices in the main power circuit to operate and generate a compensation current to compensate for the ripple current of the target frequency component of the DC bus. This invention solves the problem of poor ripple suppression performance of high-power DC active filters at low switching frequencies. It enables the application of DC active filters at lower switching frequencies up to MW-level power applications, meeting the DC bus ripple suppression requirements for long-term operation of high-power power supplies.

The present invention discloses an overall hoisting method for a drill floor module, including: confirming the installation position of the third hook carrying the lifting lug and the auxiliary lifting for turnover; confirming the force application point positions of the first hook and the second hook; respectively determining the positions of the lifting lugs carried by the first hook and the second hook; marking according to the ship bottom baseline and the hull center line; temporarily welding angle steels with a preset height at the four corners of the front and back sides of the drill floor module, and making center punch marks of the horizontal height on them as the horizontal height reference for subsequent equipment installation; conducting simulated hoisting to ensure that the accuracy meets the preset requirements; arranging at least two guide plates circumferentially at the lower half closing openings of each drill floor leg, and respectively positioning and hoisting the drill floor sections connected with the upper half of the drill floor legs to all the lower half parts of the drill floor legs; completing the positioning installation of the drill floor module based on the marks.

The utility model relates to the technical field of building construction, and discloses a large-span steel structure limited space low-position integral lifting support which comprises a support component, a lifting device and a plurality of embedded parts, the support component comprises a stand column, the stand column is arranged above an outer side original structural beam, and the lower end of the stand column is fixedly connected to the corresponding original structural beam through a first embedded part; the top end of the stand column is fixedly connected with a platform beam horizontally and forwards extending out of the original structural beam, an inclined strut is fixedly connected between the stand column and the platform beam, and the lifting device is installed at the foremost end of the platform beam; a rear pull rod is fixedly connected to the rear side face of the upper portion of the stand column and gradually inclines backwards and downwards, and the lower end of the rear pull rod is fixed to the original structural beam on the inner side through a second embedded part. The steel structure lifting device is stable in structure, is suitable for lifting a steel structure in a narrow space in the middle of a floor, can be detached and recycled, and provides guarantee for smooth large-span space steel structure and overall lifting.

The application discloses a kind of polyhedral noise under nonlinear unmanned system online data-driven event trigger control method and system, method includes: for unknown nonlinear function dynamic discrete time nonlinear system equation, discrete time nonlinear system equation is changed into linear time-varying system equation;For unknown bounded noise in measurement data, construct noise polyhedron set, construct data-driven system set in combination with linear time-varying system equation;Dynamic event trigger transmission strategy of data-driven is constructed;Stability criterion and new trigger condition are established, optimization problem is constructed and is solved, new event trigger transmission mechanism weight matrix and state feedback controller gain matrix are obtained, in combination with stability criterion, state feedback controller gain matrix, new event trigger transmission mechanism weight matrix is controlled to nonlinear unmanned system.This application can make nonlinear unmanned system meet performance index and reach the goal of minimizing feedback controller transmission frequency.

This invention provides a key parameter design method for a satellite communication receiving system based on a phased array antenna. The method includes: dividing the phased array antenna-based satellite communication receiving system into functional units to determine key design parameters; determining the target carrier-to-noise ratio of the receiving system; and, based on actual application conditions or traditional design methods, pre-setting some key parameters as a design basis to determine other key parameters. By dividing the phased array antenna-based satellite communication receiving system into functional units, identifying the core design of the receiving link and the key design parameters of each functional unit, and rationally allocating the key parameter indicators of each functional unit, this method bridges the key gap between system link budget and engineering design implementation, resolving the tight coupling problem between the two. It improves the overall cost-effectiveness of engineering design implementation in terms of performance, cost, power consumption, and size, and serves as a guide for the design and implementation of a phased array antenna-based satellite communication receiving system.

This utility model discloses a common design mechanism for filters, including a fuel assembly. The fuel assembly includes a housing, a fuel pump housed within the housing, a fuel delivery pipe connected to the fuel pump, and a fuel storage housing housed within the housing. The common design component includes filters symmetrically arranged within the housing, a return pipe connected to one of the filters, an outlet pipe connected to the other filter, and a steel ball housed within the outlet pipe. This utility model achieves a universal design by incorporating the functions of the original design through the fuel assembly and the common design component. It optimizes the design in terms of development cost and speed, achieves interchangeable parts, reduces mold development costs, and thus lowers development costs and accelerates development speed.

A liquid cooling plate for a drive motor controller includes a controller housing. A heat dissipation substrate is provided inside the controller housing, and the heat dissipation substrate and the controller housing are sealed to form a liquid cooling plate channel. An IGBT module is disposed on the upper surface of the heat dissipation substrate, and a heat sink corresponding to the IGBT module is disposed on the lower surface of the heat dissipation substrate. The heat sink is located within the liquid cooling plate channel. The liquid cooling plate channel includes two channel regions: a first channel region and a second channel region, extending from the channel inlet to the channel outlet. Each channel region corresponds to a half-bridge of the IGBT module. The parameters of the liquid cooling plate channel satisfy the following relationship: