排序方式: 共有29条查询结果,搜索用时 31 毫秒
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蓄电池过早损坏的原因分析及正确使用 总被引:1,自引:1,他引:1
在汽车运输中,由于不能正确使用蓄电池而使其过早损坏的现象较严重.经过大量调查表明,实际使用中,达不到正常使用寿命(标准寿命循环为220~280次,即可使用3年左右)就报废的蓄电池占在用电池60%~70%.以天津交通局一运公司9个运输场为例,见表1. 相似文献
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本文介绍了液压汽车离合器膜片弹簧综合性能检测机的结构,性能和微机测控原理,经实际反应该机性能良好测试系统运行稳定可靠,自动化程度高,生产率高,适全于膜片弹簧生产线上最终检测使用。 相似文献
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Fish are able to make good use of vortices. In a complex flow field, many fish continue to maintain both efficient cruising
and maneuverability. Traditional man-made propulsion systems perform poorly in complex flow fields. With fish-like propulsion
systems, it is important to pay more attention to complex flow fields. In this paper, the influence of vortices on the hydrodynamic
performance of 2-D flapping-foils was investigated. The flapping-foil heaved and pitched under the influence of inflow vortices
generated by an oscillating D-section cylinder. A numerical simulation was run based the finite volume method, using the computational
fluid dynamics (CFD) software FLUENT with Reynolds-averaged Navier-Stokes (RANS) equations applied. In addition, dynamic mesh
technology and post processing systems were also fully used. The calculations showed four modes of interaction. The hydrodynamic
performance of flapping-foils was analyzed and the results compared with experimental data. This validated the numerical simulation,
confirming that flapping-foils can increase efficiency by absorbing energy from inflow vortices. 相似文献
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介绍了一种高压换热设备所用铬钼钢换热管及管板材料特性和焊缝结构设计,并给出了具体的焊接工艺(即封口焊工艺)及有关参数。 相似文献
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轮对自动检测机的研制及应用 总被引:3,自引:0,他引:3
根据货车轮对测量手段落后、测量误差大、劳动强度高等问题,研制成功货车轮对自动检测机。该机可对采用滑动轴承轮对结构的B、C、D、E各标准轮对和采用滚动轴承轮对的RD2型轮对进行动、静态自动测量,为提高测量精度、减轻劳动强度、提高工效,同时也为我国的轮对测量自动化和机车车辆生产提供了一项新的应用技术。 相似文献