3results about How to "Increase initial speed" patented technology

A launch system and method for a launch vehicle that can save initial launch fuel includes a support structure, characterized in that: the support structure consists of a horizontal support frame (3) and an ascending section support frame (4), a horizontal track section (5) is installed on the horizontal support frame (3), an inclined track section (6) connected to the horizontal track section (5) is installed on the ascending section support frame (4), a launch acceleration pipe (10) is fixedly installed on the horizontal support frame (3) and the ascending section support frame (4), an electromagnetic catapult (14) is installed on the electromagnetic catapult slide rail (13), a rocket trolley (8) is installed on the horizontal track section (5) and the arc track section (6), and a rocket bracket (9) is provided on the rocket trolley (8). The present invention has a reasonable structure, can obtain sufficient initial velocity before launch ignition, can save launch fuel, can increase the effective payload, and is conducive to saving launch costs.

The invention discloses a hand-push type movable dustproof device for green building construction, and relates to the technical field of green building construction equipment. An existing dustproof device is inflexible to move, inconvenient to adjust dust falling angle and height and low in dust removal efficiency. The device comprises a moving structure, an adjusting structure, a dustproof structure and a water pump; the moving structure is provided with a bottom plate with moving wheels and a hand pushing frame, and overall movement is achieved. The adjusting structure comprises a horizontal steering mechanism, a height adjusting mechanism and a pitching angle adjusting mechanism, and is used for adjusting the space attitude of the dustproof structure in all directions; the dustproof structure is connected to the upper portion of the pitching angle adjusting mechanism and comprises a dust falling cover, a fan and an atomization spraying device. The water pump is arranged on the bottom plate, and a water outlet of the water pump is connected with the atomization spraying device through a water supply pipe. The device integrates the functions of movement, multi-dimensional adjustment and aerial fog cooperative dust removal, is convenient to move, can accurately control the spraying direction, height and angle, is high in dust removal efficiency, and is mainly used for raising dust treatment in green building construction.

The invention relates to a city-level BIM model data lightweight processing method, belongs to the technical field of BIM model optimization, and solves the problems of insufficient lightweight depth and low instantiation reuse rate of an existing BIM model. Comprising the following steps: analyzing a BIM model, and dividing model data into geometric data and description data; performing normalization and parameterization processing on geometric data of each component family in the model to obtain standardized geometric primitives and transformation parameters of each component; performing optimization processing on the standardized geometric primitives to obtain grid data of a plurality of precision grades; for the grid data of each precision grade, firstly combining components meeting a preset condition, then extracting geometric topological characteristics of uncombined components, comparing the geometric topological characteristics, establishing a reference relationship of accurate instantiation or fuzzy instantiation, and updating description data; and compressing and packaging the grid data of each precision grade and the updated description data to obtain a lightweight file. And the lightweight effect of the model data is improved.