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主动铰接型盾构机在曲线隧道开挖中应用广泛,其盾构姿态的精密解算是盾构机自动导向系统的核心功能,也是盾构掘进中进行盾构机实时纠偏的前提和基础。国内外盾构机自动导向系统提供商对自身盾构姿态计算原理和方法保密的现状,给盾构机姿态人工复核和盾构施工带来了较大困难。本文在研究两款国产盾构机和日本演算工坊棱镜法自动导向系统的基础上,利用立体几何和空间投影变换原理,提出了主动铰接型盾构机姿态精密解算方法,给出详细推导计算公式。通过对多台盾构机在不同隧道线型内多组姿态坐标数据的计算和对比,验证了该盾构姿态精密解算方法的正确性。 相似文献
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通过对盾构机全站仪激光导向系统的测量原理研究,并对盾构坐标与施工坐标系的旋转模型转换原理分析,建立盾构姿态参数与坐标旋转模型的关系。然后通过全站仪测量激光标靶棱镜和切口坐标与激光标靶相对位置的误差分析得到相关结论。 相似文献
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为适应地下立体交通工程箱涵顶进置换管幕施工的新方法,研究开发了一套以自动全站仪为主的智能导向系统。介绍了该智能导向系统的原理及关键技术,并结合该系统在上海金山既有铁路下顶进公路箱涵工程的顺利完成和成功应用,表明了该系统在实际施工中的优越性与实用性,具有自动化程度高、可靠性强、测量精度高的特点,可以为纠偏提供实时偏差信息,达到信息化施工的目标。 相似文献
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As technology matures, Real Time Kinematic (RTK) global positioning system (GPS) receivers are providing increased performance
in accuracy, on-the-fly (OTF) initialization times, measurement speed, and latency. Leica's Dozer 2000 machine guidance system
combines an MC1000 GPS sensor, graphic intensive guidance software, a digital terrain model, and a digital site plan. Figure
1 shows the operator's view of the system. The end results is a highly accurate, extremely responsive local navigation system.
Engineers can easily upload design information onto a touch-screen machine guidance personal computer (PC) and greatly reduce
earthmoving costs while simultaneously recording “as-built” inspection data.
The Leica MC1000 machine control sensor is a true 10-Hz, centimeter-level-accuracy, open-architecture GPS sensor specifically
designed for machine guidance and control. At the heart of the MC1000's performance are a very stable oven-controlled oscillator
(3 × 10−11/s short-term stability), a low-power Intel 486-DX4-80 processor, and four user-configurable input/output (I7O) ports. Special
algorithms mitigate the effects of multipath and Selective Availability (SA) while providing centimeter accuracy up to 10
times per second with only 30 milliseconds' latency. The high update rate and low latency are essential for machine guidance
and control.
The MC1000 GPS reference station is capable of outputting RTK and Differential GPS (DGPS) data simultaneously, providing and
entire site with GPS information for machine guidance and control, tracking and dispatching of vehicles, and support of survey
crews.
This article describes how recent advances in technology have combined to produce the Leica Dozer 2000 – a machine guidance
system that is ideal for a wide range of earthmoving and inspection applications. ? 2000 John Wiley & Sons, Inc. 相似文献
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基于InSAR技术的基本原理,在h=0处进行了泰勒级数展开,推导了干涉相位组成。根据干涉相位组成论证了基线对影像相干性、高度灵敏度、平地效应及干涉SAR系统距离分辨率等的影响,利用数据进行了仿真实验,指出了基线长度对干涉图的影响程度,对合理选择干涉像对具有指导意义。 相似文献