Texas Tech field experiments of wind loads. Part 1: Building and pressure measuring system

1992 ◽  
Vol 43 (1-3) ◽  
pp. 1615-1616
Author(s):  
M. Levitan ◽  
K.C. Mehta
Keyword(s):  
Field Experiments ◽  
Measuring System ◽  
Wind Loads

Measuring glacier-motion fluctuations using a computer-controlled survey system

1986 ◽  
Vol 23 (5) ◽  
pp. 727-733 ◽  
Author(s):  
Garry K. C. Clarke ◽  
Robert D. Meldrum ◽  
Sam G. Collins
Keyword(s):  
Field Experiments ◽  
Water Pressure ◽  
Yukon Territory ◽  
Measuring System ◽  
Time Intervals ◽  
Stationary Target ◽  
Survey System ◽  
Computer Controlled ◽  
Glacier Flow ◽  
Glacier Motion

We describe a computer-controlled, distance-measuring system designed for glacier-motion surveys. A Sharp PC-1500 pocket computer is used to control an AGA Geodimeter 122 infrared laser ranger. Slope distance and vertical angle are automatically measured and plotted at preselected time intervals and recorded on magnetic tape. As a demonstration, three field experiments were performed on Trapridge Glacier, Yukon Territory. In the first experiment the position of a glacier flow marker was measured at 1 min intervals for 39 h. The average velocity (toward the instrument) was found to be 2.99 mm h−1. Subglacial water pressure was simultaneously measured at the flow marker site. For the duration of the survey, water pressure was low, and there is no clear relationship between pressure variations and glacier motion. In the second experiment the distance to a stationary target was measured at 1 min intervals for 9 h. The calculated motion of this target was −0.149 mm h−1, giving an indication of the magnitude of uncorrected distance errors. The third experiment lasted 35 h and again involved measurements of glacier flow. The calculated target motion was 1.80 mm h−1 toward the instrument.

Study on the Frequency Compensation of the Dynamic Unbalance Signal Extraction for General Hard Bearing Dynamic Balancing Machine

2017 ◽  
Vol 870 ◽  
pp. 173-178 ◽  
Author(s):  
Ru Qin ◽  
Ping Cai ◽  
Ding Ding Zhao ◽  
Yi Gao
Keyword(s):  
Field Experiments ◽  
Measuring System ◽  
Measuring Error ◽  
Frequency Compensation ◽  
Dynamic Balancing ◽  
Third Order ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Rotating Speed ◽  
Low Pass

When a dynamic balancing measuring system is equipped with velocity sensor as its vibration pick-up, the output signal of the sensor is proportional to the third power of rotating speed of the balancing operation. Generally a third order low-pass filter circuit is often used to eliminate the influence of rotating speed and suppress the high frequency interference as well. However, the frequency response of third order low-pass filter circuit can’t compensate completely for the response characteristic of the vibration system of balancing machine, which then causes measuring error. So, as a general purpose hard bearing dynamic balancing machine being suitable for a wide speed range, frequency compensation must be conducted. The approach of frequency compensation is classified into two broad types: hardware and software compensation. This paper conducts further research on these two methods to improve the accuracy of the measuring system and proves the accuracy and effectiveness of the two methods by signal simulation and field experiments.

Software Design and Implementation of Measuring System of Transmission Lines Based on Wireless Communication

2014 ◽  
Vol 1070-1072 ◽  
pp. 1171-1174
Author(s):  
Yan Cheng ◽  
Shu Min Sun ◽  
Yu Meng ◽  
Rui Qi Wang ◽  
Pan Ting Dong
Keyword(s):  
Wireless Communication ◽  
Transmission Line ◽  
Data Storage ◽  
Measurement System ◽  
Transmission Lines ◽  
Field Experiments ◽  
Measuring System ◽  
Software System ◽  
Validity And Reliability ◽  
Report Generation

The software of measurement system for the transmission line debugging was designed. The transmission line is based on wireless communication. This software of measurement system is composed of acquisition controller software system and center station software system. The measurement system realized the function of data storage, waveform display, data analysis, automatic report generation and others. The field experiments were conducted at a 500kV substation in a Power Grid. The experiment proved the validity and reliability of the measurement system. The measurement system can avoid complex wiring work in substation debugging field, thus improve the experimental efficiency.

Design of Wireless Material Level Sensor Nodes for Alumina Storage Bins of Aluminum Electrolysis Plant

2014 ◽  
Vol 563 ◽  
pp. 157-160
Author(s):  
Jun Jie Yuan ◽  
Tian Yu Hu ◽  
Zhi Zeng Zhao
Keyword(s):  
High Performance ◽  
Field Experiments ◽  
Aluminum Electrolysis ◽  
Measuring Method ◽  
Sensor Nodes ◽  
Measuring System ◽  
Actual Measurement ◽  
Level Sensor ◽  
The Stability ◽  
Storage Bins

A wireless level sensor system was designed aiming at solving data acquisition issues on material level measurement of alumina storage bin towers. Using the high performance MCU, STM32, and 433MHZ wireless communication modules, the wireless nodes were developed. New measuring method based on weighing sensors was proposed to adapt to the severe environment of storage bins full of thick dusts and high-density magnetic field. Experiments and actual measurement in factory environment were performed and indicated the stability and reliability of the wireless material level measuring system.

Electron Microscopy of the Shape of Small Metal Particles

1977 ◽  
Vol 35 ◽  
pp. 300-301
Author(s):  
M. Jose Yacaman
Keyword(s):  
Electron Microscopy ◽  
Metal Particle ◽  
Field Experiments ◽  
Size Range ◽  
Dark Field ◽  
Metal Particles ◽  
Bragg Condition ◽  
Crystal Particle ◽  
Small Metal Particle ◽  
Small Metal Particles

In the Study of small metal particles the shape is a very Important parameter. Using electron microscopy Ino and Owaga(l) have studied the shape of twinned particles of gold. In that work electron diffraction and contrast (dark field) experiments were used to produce models of a crystal particle. In this work we report a method which can give direct information about the shape of an small metal particle in the amstrong- size range with high resolution. The diffraction pattern of a sample containing small metal particles contains in general several systematic and non- systematic reflections and a two-beam condition can not be used in practice. However a N-beam condition produces a reduced extinction distance. On the other hand if a beam is out of the bragg condition the effective extinction distance is even more reduced.

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