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设计了基于单片机的具有电压、电流、相位以及电阻等电参量的测量功能的数字万用表。介绍了主要的硬件电路设计和软件设计主要原理及流程,实验结果表明该仪表具有测量精度高的优点。 相似文献
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基于DSP的车床主轴回转误差的动态测量系统 总被引:1,自引:0,他引:1
邬晔佳 《精密制造与自动化》2009,(1)
数据采集及传送方案的制定是主轴回转误差动态测量装置硬件系统设计的关键.区别于基于单片机的数据采集及传送方案,提出了基于DSP的数据采集及传送硬件系统接口电路,同时讨论了基于DSP对电涡流传感器输出的电压信号实现A/D转换的软件程序设计流程.该系统较传统测量系统具有测量精度高、数据处理能力强等特点,有较高的可靠性和应用价值,可广泛应用于生产实际中. 相似文献
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设计一种由显示通信主机、测量节点组成的蓄电池电压温度检测系统,可实时检测电池的电压及温度变化,具有较高的测量精度和可靠性,并可将存储的24h数据通过U盘转储提供给PC机.文章给出了系统的设计原理、硬件结构、软件设计流程. 相似文献
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介绍了直线导轨测量平台的测量功能、特点和测量原理、机械系统和电气测控系统;直线导轨测量平台的操作流程、验收标准和验收报告。阐述了大理石测量平台的结构、精度以及测量平台的支撑和直线导轨测量平台电气系统各硬件参数和软件;论述了直线导轨测量平台的总体结构、测量平台电控系统原理图及验收报告;为直线导轨测量平台的设计、制造提供了参考。 相似文献
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The present paper is concerned with steady-state plate tearing by a cone. This is a scenario where a cone is forced through a ductile metal plate with a constant lateral tip penetration in a motion in the plane of the plate. The considered process could be an idealisation of the damage, which develops in a ship bottom raking accident or a collision with a floating object. The deformation involves a complex mixture of large plastic deformations, fracture and friction. The observed mode of deformation is idealised by a simplified, kinematically admissible deformation mode, and the rate of internal energy dissipation in plasticity, fracture and friction is quantified accordingly by analytical expressions. The idealised mode has two free parameters which are determined from the postulate that they adjust to give the least rate of energy dissipation. The theory is compared to a series of measurements. The coefficient of friction was not measured, so the calculations are presented for different realistic values and it is shown that, for a coefficient of friction of about 0.2, there is a reasonably good agreement between theory and measurements for the in-plane resistance force as well as for the out-of-plane reaction force. 相似文献
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Hongbo Lan Yucheng Ding Jun Hong Bingheng Lu 《The International Journal of Advanced Manufacturing Technology》2008,37(3-4):341-353
This paper presents a novel reverse engineering digitizing system for full part geometry, which is based on a cross-sectional
imaging device built in a NC milling machine. The system successively captures a picture for each planar cross-section contour
of the part by end-milling and CCD imaging, and builds the geometry for both external and internal surfaces of the complex
3D part based on a set of the vectored cross-sectional contours. The system mainly consists of three components: a NC milling
machine, a cross-sectional imaging device and a computer control unit. Some issues involving the principle and process flow
of the system, encasing materials, cross-sectional imaging and NC code generation, etc. are described in detail. Built on
an existing NC milling machine, a portable device for capturing the cross-sectional images is designed, which includes an
isolated light source, a digital camera, a protective case, a rigid arm and a robust tripod. The device, connected to a computer
control unit, serves as a highly flexible accessory for the NC milling machine, constructing the cross-sectional imaging system
for reverse engineering. Furthermore, the error analysis and accuracy assessment of the system are also addressed. A typical
case is discussed in detail to illustrate the applications of the system. Such a re-configurable digitizing system for reverse
engineering offers a number of advantages, such as the functional extension of an existing NC milling machine, low costs,
and rapid construction. As a result, this system provides a feasible and useful scheme for many enterprises to construct their
own reverse measuring system based on existing equipment to aid in rapid product development and extend the function of existing
equipment. 相似文献
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对于面向客户定制的生产和系列化产品来讲,由于不同产品的零部件之间存在相似性,可以建立类BOM来降低不同产品的BOM数量,以便于BOM的管理。本文介绍了类BOM的建立过程、类BOM的概念模型以及类BOM的匹配设计语言描述,最后给出了基于XML的类BOM的实现。 相似文献
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介绍了如何利用计算机对于形状复杂和高精度的凸轮进行辅助设计,以及将设计结果直接在数控机床上加工的方法,分析了图解法设计的局限性和计算机辅助设计的优越性,指出了利用计算机辅助解析法设计是实现数控加工的基础,也是未来机械设计的发展方向。 相似文献
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为弥补海洋模拟试验数据采集困难、数据量大、环境复杂等不足,设计了无人水下航行器陆地模拟试验系统。这一试验系统由池体、水深模拟模块、障碍物模拟模块和检测系统组成。池体、水深模拟模块和障碍物模拟模块用于模拟试验对象的运行环境,通过可升降假底模拟水深变化,通过池底滑块和滑道模拟障碍物。检测系统包括测量单元、数据采集和处理单元、数据传输单元、控制单元和数据输出单元。这一试验系统通过测定俯仰角、偏航角及横滚角等参数,为无人水下航行器的设计和改进提供技术参考。 相似文献
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为了实现大视场微型仿生复眼系统的增材制造,对仿生复眼的成像原理、微透镜阵列与中继系统的设计以及复眼系统的机械结构进行了研究。根据仿生复眼的光学原理设计出单个微透镜,并完成微透镜阵列。通过设计中继系统,使曲面阵列所成的曲面像转换成平面像,从而被平面探测所接收。将微透镜阵列与中继系统组合并对其进行优化。为了满足复眼系统3D增材制造工艺,对其机械结构进行设计。整个复眼系由3481个紧密拼接的正六边形微透镜组成,每个微透镜的视场为4°,通光口径为110μm,整个复眼的视场为123.7°。在120 lp/mm处,复眼各视场的MTF值均大于0.3,各视场点列图的RMS半径均小于艾里斑半径。该系统成像质量良好,公差分析结果表明其像质满足成像要求,满足增材制备工艺需求。 相似文献
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在小型化成像光谱仪的研制和应用中,如何同时实现轻量化、高地面分辨率和高信噪比是目前亟待突破的技术难题。本文通过将线性渐变滤光片分光技术和数字域时间延迟积分技术相结合,并对镜头进行紧凑化处理,设计了一款工作波段为403~988 nm、平均光谱分辨率为8.9 nm、系统总质量为7 kg的轻小型星载高光谱成像光谱仪。仿真和实验结果表明,该高光谱成像仪能在500 km轨道上得到刈幅宽度为50.5 km、地面分辨率为10 m的高光谱图像,且图像信噪比良好。该成像光谱仪可为微纳卫星获得高分辨率的高光谱图像提供技术支持,推动了我国高光谱遥感探测技术的发展。 相似文献