共查询到19条相似文献,搜索用时 95 毫秒
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针对火炮身管内膛疵病种类多、定性定量分析难和检测自动化程度低等问题,提出了一种基于ASODVS的火炮身管损伤视觉检测方法,既能视觉检测身管横截面几何尺寸又能获取和分析身管内壁表面缺陷,还能对身管内表面三维测量和重构。首先,通过高斯曲线法提取激光扫描全景图像中的激光中心点,并采用贝塞尔曲线对提取的激光中心点进行平滑处理;接着,根据ASODVS的标定结果解析出全景图像上身管内壁全景激光投射点的三维点云数据;进一步,根据定性分析中识别出来的疵病采用四连通域法标记损伤,进而求解该损伤部分的面积和深度,然后采用椭圆拟合法测量身管形变;最后用3D重构技术将定性定量分析结果进行融合,重构出火炮身管真实状态,实现身管窥膛"采集-识别-判定-重构"全过程的定性定量自动视觉检测。实验结果表明:基于ASODVS的火炮身管损伤检测系统能够快速检测出各种火炮疵病,并能精确解析出疵病所处的空间位置、大小及深度等重要信息,测量误差基本满足国标规定要求,为火炮身管修复及寿命预估等奠定了坚实的基础。 相似文献
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设计了一套基于线阵CCD技术的火炮身管测径仪,在此基础上,介绍了测径系统的基本测量原理,为了能全面提高测径仪的自动化水平及实际测量效果,从系统误差、CCD传感器误差、测量原理误差三个方面,分析了火炮身管测径仪测量误差的产生原因以及对测量精度的影响,并给出消除或减小误差的有效方法,从而大大提高了测径仪测量精度,增强了系统的实际应用能力。 相似文献
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本文介绍了基于线阵CCD的火炮身管测径系统,运用亚像素技术对实验数据进行处理,通过试验对比,提出了适合该测径系统的数据处理方法. 相似文献
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火炮身管疵病深度测量系统 总被引:1,自引:0,他引:1
为了准确获取火炮身管疵病深度参数,提出了一种新的基于等效多基线立体成像的疵病深度测量方法,并采用单摄像机建立了疵病深度自动测量系统。首先,对摄像机采用Tsai两步法进行标校。接着,采用等效多基线立体成像法获取疵病图像。在此基础上,利用标校数据和图像的位置参数,通过疵病特征提取和疵病图像立体匹配处理,获取疵病深度图像的输出,从而得到准确的疵病深度值,实现对火炮身管疵病深度参数的精确测量。测试结果表明:该疵病测量系统得到的疵病深度测量绝对误差0.1 mm,相对误差5%,完全满足火炮身管疵病深度测量的需要,能够为火炮鉴定试验和伴装保障提供重要的技术支持。 相似文献
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时火炮身管疲劳寿命进行阶段划分.根据损伤容限设计理论,依据Paris公式推导出已知初始裂纹的火炮身管刺余疲劳寿命公式,针对某些情况对该公式进行分析讨论. 相似文献
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After having reviewed briefly the reliability of vacuum tubes on spacecraft, it is shown that the operation in space of a vacuum tube with an open structure is possible provided adequate measures are taken. The tube considered here is a multielectrode electron gun emitting electrons into space, in order to control the potential of a satellite. To avoid the failure of the most sensitive element of the gun, namely the impregnated tungsten cathode, the gun design includes such characteristics as a slow warming up of the heater element, a reactivation program used in case of cathode contamination, and a clean opening system which is not contaminant. Similarities with communication tubes are considered and the advantages of open tubes are mentioned. 相似文献
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气体炮发射冰雹机理研究 总被引:2,自引:1,他引:1
运用简单波、冲击波理论,通过对气体炮打开后气体在发射管内的运动分析,给出作用在弹丸底部气体压力的最大值,根据冰雹弹丸的物理特性,提出进一步提高气体炮发射冰雹速度的方法。 相似文献
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介绍了应力波安装干涉配合紧固件的原理,结合工程应用提出了干涉配合紧固件应力波安装仪的方案。设计了安装仪控制系统及安装枪结构,研制成功应力波安装仪。试验表明研制的低压便携式安装仪可以满足工程需要,能够解决传统安装方法所存在的问题。 相似文献
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高效缠绕管式换热器的节能分析与工业应用 总被引:3,自引:1,他引:2
介绍了缠绕管式换热器的节能原理,利用工业应用实例对缠绕管式换热器的节能进行了分析,并根据工业实际情况,提出了采用缠绕管式换热器,可使工艺流程简洁、操作条件优化、大幅度降低能耗的观点。 相似文献
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Gun barrel erosion is one of the major problems limiting the velocity, range and accuracy of the projectile. The various interacting mechanisms causing erosion are discussed. The importance of developing scaling laws governing gun tube erosion is emphasized. The approach adopted in this paper for the development of scaling laws is inspired by similar attempts in cavitation and liquid impact erosion. The concepts of threshold erosion, erosion intensity, erosion strength and erosion parameter are extended, modified and applied to gun tube erosion. As a result, the outlook for developing scaling laws governing gun barrel erosion seems very promising. The nondimensional number called the erosion parameter is given by the ratio between the output intensity of erosion representing the energy absorbed by the material and the input intensity of erosion contributed by the erosive forces. The output intensity of erosion is given by the product of the rate of depth of erosion and erosion resistance of the material, whereas the input intensity includes the Poisson's ratio of the projectile, the maximum acceleration, the maximum velocity and the bore diameter. With the aid of a few justifiable assumptions, it has been shown that the rate of depth of erosion is directly proportional to the square of the bore diameter. Available experimental data support these results for velocity scale and size scale. Further experiments are required to test these predictions fully. The erosion state is highly dependent on the number of rounds fired; it has four stages including incubation, acceleration, deceleration and steady state periods very similar to other erosion phenomena. Previously developed erosion theory correlates well with the available gun tube erosion rates as a function of the number of rounds fired; this lends further support to the erosion model proposed in this paper. However, the interacting influences of thermal and chemical mechanisms must be carefully considered in any further developments. 相似文献
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为降低护士在血样采集时出错的概率,同时提高采血效率,研制了一种采血管贴标系统.通过以太网读取病人信息,通过机械手抓取采血管,利用不干胶热敏打印设备打印标签,配以相应夹爪进行贴标.控制系统采用安卓工控机连接扫码枪、医院信息系统、PLC 和打印机,作为控制系统的联网设备和信息中枢;采用 PLC 作为控制核心,依据工控机信息控制机械手、电磁铁夹爪和电动夹爪等部件协调动作.经测试,该系统各部件动作协调,整体稳定可靠. 相似文献