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  • GB/T 19315-2003小艇 最大装载量Small craft--Maximum load capacity

    本标准列出了未超过其他ISO标准对稳性、干舷高、漂浮和乘员等限制要求时小艇最大装载量中所包括的项目,并规定了乘员座位的要求。 本标准适用于按ISO8666艇体长度LH不大于24m的小艇。不适用于ISO6185所述及的充气艇 和IS013590所述及的个人艇。...

    2022-06-08 16:24:42浏览:4 craftmaximumcapacity

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  • Research on Three Dimensional Computer Assistance Assembly Process Design System

    The computer aided process planning will certainly play a significant role in the success of enterprise informationization. 3-dimensional design will promote Tri-dimensional process planning. This article analysis nowadays situation and problems of assembly process planning, gives a 3-dimensional computer aided process planning system (3D-VAPP), and researches on the product information extraction, assembly sequence and path planning in visual interactive assembly process design, dynamic emulation of assembly and process verification, assembly animation outputs and automatic exploding view generation, interactive craft filling and craft knowledge management, etc. It also gives a multi-layer collision detect and multi-perspective automatic camera switching algorithm. Experiments were done to validate the feasibility of such technology and algorithm, which established the foundation of tri-dimensional computer aided process planning....

    2020-11-11 22:33:38浏览:28 assemblycraftinformationextractioncollisiondetectPlancomponents

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  • Paste-like self-flowing transportation backfilling technology based on coal gangue

    A paste-like self-flowing pipeline transportation backfilling technology with coal gangue as aggregate is proposed to remove the potential damage caused by coal gangue piles. As well, the difficult problems of recovering high quality safety coal pillars and deep mining of the Suncun Coal Mine (SCM), Xinwen Coal Group, Shandong are resolved. The physical-chemical properties of coal gangue, optimized proportion of materials, backfilling system and craft in the SCM were studied in the laboratory and then an industrial test was carried out on high quality coal pillars under a town. The results show that finely crushed kaolinized and fresh gangue with granularity less than 5 mm can be used as aggregate with fly ash to replace part of the cement and a compos-ite water reducer as an additive, accounting for 1.0%-1.5% of the total amount of cement and fly ash. The recommended proportion is I(cement):4(fly ash): 15(coal gangue), with a mass fraction of 72%-75%, theological paste-like properties and a strength of more than 0.7 MPa at 7 d. The sequence of adding cement, fly ash, water reducer and then coal gangue ensures that the suspended state of the slurry, reducing the wear and jam of pipelines. The working face is advancing continuously by the alternating craft of building block walls with coal gangue and backfilling mined-out gobs with paste-like slurry. The recovery rate is as high as 90% with a backfilling cost of 36.9 Yuan/t, good utilization of coal gangue and no subsidence on the surface. This technology provides a good theoretical basis and application experience for coal mines, cement backfilling with paste-like slurry....

    2020-06-12 16:18:13浏览:1390 coalganguepaste-likeself-flowingbackfillingsystemcraft

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