搜索结果: 1-13 共查到“知识库 工学 tilt”相关记录13条 . 查询时间(0.081 秒)
EXPERIMENTS ON CALIBRATING TILT-SHIFT LENSES FOR CLOSE-RANGE PHOTOGRAMMETRY
Tilt-shift lens Scheimpflug principle Close range photogrammetry Brown model Pinhole camera Calibration Accuracy Precision Relative accuracy
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2016/11/11
One of the strongest limiting factors in close range photogrammetry (CRP) is the depth of field (DOF), especially at very small object distance. When using standard digital cameras and lens, for a spe...
Ground tilt monitoring at Phlegraean Fields (Italy): a methodological approach
tilt data thermoelastic deformation thermal correction
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2015/9/17
Among geodetic methods used for monitoring ground deformation in volcanic areas, tiltmetry represents the
most rapid technique and therefore it is used by almost all the volcanological observatories ...
Design of an FPGA-based Array Formatter for CASA Phase-Tilt Radar System
Field Programmable Gate Array (FPGA) System Design Data Processing Soft Processor Radar Controller Phased-Arrays
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2014/12/8
Weather monitoring and forecasting systems have witnessed rapid advancement in recent years. However, one of the main challenges faced by these systems is poor coverage in lower atmospheric regions du...
TMT三镜系统tilt 轴轴承方案研究
30 m 望远镜项目 轴承布置形式 轴承模拟 有限元仿真
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2016/8/4
30 m口径望远镜(TMT)的三镜跟踪系统(M3PA)的运动性能和指向精度指标均高于已建成的各大望远镜,且工况复杂多变,给设计人员带来了巨大的挑战。三镜跟踪系统包括Rotator 轴和Tilt轴两部分。重点研究了Tilt 轴轴承布置方案以及相应分析。提出了两种轴承方案,经过分析,使用一对双列角接触转盘轴承的方案更适合于Tilt 轴的工作需要,此时结构第一阶谐振频率可达到15.1Hz,满足Tilt ...
Prediction of Slope Failure Using Highly Accurate Tilt Sensors
Prediction Slope Failure Highly Accurate Tilt Sensors
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2013/9/30
This paper presents the application of tilt sensors to measure the movements of a slope surface and slope crest just before failure during excavation of the lower parts of the slope. The tilt sensors ...
The feasibility of low-cost, dual-polarized, phase-tilt antenna arrays for dense radar networks
Pure sciences Applied sciences Antenna arrays Dual polarized Phased array Radar networks
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2014/11/7
This document address the feasibility of low-cost, dual-polarized, X-band phased array antennas for use in dense radar networks for weather surveillance. The "phase-tilt" architecture under investigat...
Temperature-independent fiber bragg grating tilt sensor.
fiber Bragg gratings (FBGs) fiber-optic sensors temperature-insensitive tilt measurement
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2013/5/27
A novel fiber Bragg grating (FBG) tilt sensor is proposed to detect the magnitude and the direction of a two-dimensional inclination by using four FBGs. High angle sensitivity and measurement resoluti...
Temperature-insensitive 2-D tilt sensor by incorporating fiber Bragg gratings with a hybrid pendulum.
Fiber Bragg gratings (FBGs) Fiber-optic sensors Tilt measureme nt Temperature insensitive Hybrid pendu lum
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2013/5/27
A novel two-dimensional (2-D) tilt sensor is demonstrated by incorporating only twofiber Bragg gratings (FBGs) with a hybrid pendulum transducer. The pendulum transducer is specially designed with hol...
Temperature-insensitive 2D tilt sensor with three fiber Bragg gratings.
fiber Bragg gratings fiber-optic sensors tilt measurement
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2013/5/27
A two-dimensional (2D) tilt sensor based on three optical fiber Bragg gratings (FBGs) isproposed and demonstrated. Experimental results show that a high measurement sensitivity of 192 pm/◦ and r...
Temperature-insensitive FBG tilt sensor with a large measurement range
Fiber Bragg gratings (FBGs) Fiber-optic sensors Tilt measurement
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2013/5/24
A novel two-dimensional tilt sensor with a large measurement range is demonstrated by using four fiber Bragg gratings (FBGs) attached on a cylindrical cantilever-based pendulum. Experimental results s...
刀倾法数控加工机床调整参数转换（NC Machine Settings Transformation for Tilt Method）
Free-Form机床 机床调整参数转换 刀倾法
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2009/11/24
研究了刀倾法加工摇台型机床调整参数向Free-Form型机床转换的原理和方法。建立了基于空间坐标变换刀倾法加工的数学模型，可用于单齿分度和连续分度加工；在摇台型机床固定坐标系中，通过辅助坐标系确定了刀具轴和工件轴之间的相对位置和相对运动关系，将这种关系等价地转换到Free-Form坐标系，确定6个数控轴表达式并进行多项式展开。最后，通过算例验证本文转换方法的正确性，TCA结果表明这种转换方法是可行...
Micro-Optoelectromechanical Tilt Sensor
Micro-Optoelectromechanical Tilt Sensor
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2009/9/7
This paper presents a novel hybrid CMOS/MEMS tilt sensor with a 5∘ resolution over a 300∘ range. The device uses a MEMS-based semicircular mass suspended from a rigid body, projecting a sh...
Performance analysis of bit error rate for free space optical communication with tip-tilt compensation based on gamma–gamma distribution
free space optical communication atmospheric turbulence
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2011/5/10
In this paper, the gamma – gamma probability distribution is used to model turbulent channels. The bit error rate (BER) performance of free space optical (FSO) communication systems employing on-off k...