Tire-Road Friction Measuring System — A Second Generation

1968 ◽  
Author(s):  
Gary L. Goodenow ◽  
Thomas R. Kolhoff ◽  
Fraser D. Smithson
Keyword(s):  
Second Generation ◽  
Measuring System ◽  
System A ◽  
Road Friction

Development of an In-Situ Laser Absorption NO/NO2 Measuring System for Gas Turbine Exhaust Jets

2006 ◽  
Author(s):  
Y. Zhu ◽  
H. Yamada ◽  
S. Hayashi
Keyword(s):  
Gas Turbines ◽  
Beam Steering ◽  
Measuring System ◽  
Gas Flows ◽  
Exhaust Gas ◽  
Gas Temperature ◽  
Laser Absorption ◽  
System A ◽  
Gas Turbine Exhaust ◽  
Exhaust Gas Temperature

A diode-laser absorption system having the potential of simultaneous determination of NO and NO2 concentrations in the exhaust jets from gas turbines has been being developed. The sensitivities of the detection units at a typical exhaust gas temperature of 800 K were estimated as 30 ppmv-m and 3.7 ppmv-m for NO and NO2, respectively. Experiments using simulated exhaust gas flows have shown that CO2 do not have any interference with the NO and NO2 measurements. The detection limits in ppm of the system were considerably lowered by using a multi-pass optical system. A pair of off-axis parabola mirrors was useful to prevent the laser beam from straying from the detection area of the sensor due to the beam steering in the exhaust gas. Furthermore, the multi-path optical duct fabricated with 14 mirrors on the inner wall was effective in the measurement of NO and NO2 in the exhaust gas from gas turbines.

Continuous Evaluation of P a, Oa, O2 in Fish: Recording and Data Processing

1979 ◽  
Vol 82 (1) ◽  
pp. 321-330
Author(s):  
ALAIN BELAUD ◽  
YVES TROTTER ◽  
CLAUDE PEYRAUD
Keyword(s):  
Data Processing ◽  
Breathing Pattern ◽  
Measuring System ◽  
Technical Improvement ◽  
Measuring Device ◽  
Continuous Evaluation ◽  
System A ◽  
Data Processing Method ◽  
Rapid Changes ◽  
Physiological Variations

1. In the eel (Anguilla anguxlla L.), the dorsal and ventral aortas and the subhepatic vein were catheterized to provide an external circulatory shunt. POO2 in the shunted blood was continuously recorded using a polarographic measuring device. 2. Spontaneous interruptions in the eel's ventilatory activity result in rapid changes in Pα, Oα, O2. The period of these Pα, Oα, O2 oscillations is sometimes less than 1 min. However, the response time of the measuring system is so great under the conditions of these experiments that only slow variations of Pα, Oα, O2 of a period greater than 5 min, are faithfully recorded. 3. In view of the impractibility of technical improvement in the recording system, a data processing method was developed to reconstitute the real physiological variations from the distorted experimental recordings. 4. Through this method of data correction, it is demonstrated that apnoeic or active ventilatory phases in the eel's breathing pattern are not triggered by constant low values of Pα, Oα, O2. Other physiological applications are suggested. Note: Equipe de Recherche Aasociee du Centre National de la Recherche Scientifique n 070623

Design and Experimental Study of Swing Arm Vortex-Induced Vibration Generating Device

2013 ◽  
Vol 365-366 ◽  
pp. 66-71
Author(s):  
Liang Ma ◽  
Peng Li ◽  
Yong Ma ◽  
Xuan Qi Ren ◽  
Hai Chao Ge ◽  
...  
Keyword(s):  
Water Flow ◽  
Water Channel ◽  
Measuring System ◽  
Vortex Induced Vibration ◽  
Low Speed ◽  
Circulating Water ◽  
System A ◽  
Swing Arm ◽  
System Vibration ◽  
Power Generation System

In order to expand the use of water flow, this paper presents a generating device using the vortex-induced vibration to gather energy from the low speed water flow. The device consists four parts: bearing frame, transmission and power generation system, vibration system and the measuring system. A prototype was made according to the design scheme, and finished the experimental test in a circulating water channel. The experiment showed that: the vibration body could get higher amplitude to drive the generator by controlling its stiffness coefficient; the unidirectional rotation transformed from the vortex-induced vibration reciprocating motion fluctuate obviously, which can be transferred into smooth rotation by the energy storage flywheel to drive the generator. The design and study of the swing arm vortex-induced vibration generating device provided a new idea for gathering energy from low-speed water flow, it would also provide a reference for the theoretical study and engineering applications of using vortex-induced vibration for generating.

Elastic characteristics of isolated segments of human aortas under dynamic conditions

1959 ◽  
Vol 14 (1) ◽  
pp. 55-59 ◽  
Author(s):  
Freeman W. Cope
Keyword(s):  
Hysteresis Loop ◽  
Thoracic Aorta ◽  
Measuring Equipment ◽  
Time Lag ◽  
Measuring System ◽  
Time Lags ◽  
Descending Thoracic Aorta ◽  
System A ◽  
Sufficient Magnitude ◽  
Elastic Characteristics

When isolated segments of human descending thoracic aorta were caused to change their volume rapidly and continuously in sinusoidal fashion with pulse pressures and pulse rates maintained in the physiological range, the resulting pressure-volume curves showed slight but consistent increases in stiffness, compared to pressure-volume curves obtained on the same specimens when inflated stepwise. There was introduced into the pressure measuring system a time lag of sufficient magnitude to eliminate the hysteresis loop. The extent of hysteresis in the aorta was not determined because time lags in the aorta could not be distinguished from time lags in the measuring equipment. Submitted on September 10, 1958

A Study of Characteristic Signal Propagation Buried Pipeline 2

2010 ◽  
Vol 36 ◽  
pp. 387-394
Author(s):  
Hisashi Oohira ◽  
Serikawa Seiichi
Keyword(s):  
Propagation Constant ◽  
Characteristic Impedance ◽  
Signal Propagation ◽  
Measuring System ◽  
Long Distance ◽  
Actual Measurement ◽  
Fault Resistance ◽  
System A ◽  
Characteristic Signal ◽  
Heavy Construction

It was reported in the previous report that the propagation constant measuring system for long distance pipelines was produced based upon the distribution constant theory for the purpose of maintenance and management of long distance pipelines buried underground and to have a system to directly measure the propagation constants and characteristic impedance of the pipeline buried underground. This time, a simulator for the signal propagation of a pipeline, referring to these actual measurement values, was constructed and various signal modes were simulated. On the prediction of accidents where heavy-construction equipment, such as backhoe or boring machine, has contact with a pipeline and damages the coating of pipeline, the damage simulations with a backhoe and boring machine were performed and the fault resistances of these heavy-construction pieces of equipment at the time of accidents were identified. As a result, it was revealed that the fault resistance generated by the metal-to-metal contact caused by the boring machine, which damages pipeline the most, was approximately 20-50Ω when water was used, and that caused by the backhoe was approximately 100Ω. In order to verify the detectable property of this system, a simulation was performed to determine how each distributed constant changed when this degree of grounding faults occurred in the monitoring section of the pipeline, and validated it with an actual pipeline.

scholarly journals The Static Unbalance Analysis and Its Measurement System For Gimbals Axes of an Inertial Stabilization Platform

2015 ◽  
Vol 22 (1) ◽  
pp. 51-68 ◽  
Author(s):  
Hui Yang ◽  
Yan Zhao ◽  
Min Li ◽  
Falin Wu
Keyword(s):  
Measurement System ◽  
Small Angle ◽  
Guidance System ◽  
Measuring System ◽  
Static Balance ◽  
Missile Guidance ◽  
Reciprocating Motion ◽  
Balance Condition ◽  
System A ◽  
Mass Eccentricity

Abstract To reduce the influence of the static unbalance on an infrared missile guidance system, a new static unbalance measure system for the gimbals axes has been developed. Considering the coupling effects caused by a mass eccentricity, the static balance condition and measure sequence for each gimbal axis are obtained. A novel static unbalance test approach is proposed after analyzing the dynamic model of the measured gimbal axis. This approach is to drive the measured gimbal axis to do sinusoidal reciprocating motion in a small angle and collect its drive currents in real time. Then the static unbalance of the measured gimbal axis can be obtained by the current multi-cycle integration. Also a measuring system using the proposed approach has been developed. A balanced simulator is used to verify the proposed approach by the load and repeatability tests. The results show the proposed approach enhances the efficiency of the static unbalance measurement, and the developed measuring system is able to achieve a high precision with a greater stability.

Improving the Accuracy of Robot-Based Measuring System by Calibrating Laser-Stripe Scanner Model and Hand-to-Scanner Transformation

2010 ◽  
Vol 44-47 ◽  
pp. 707-711
Author(s):  
Ai Guo Li ◽  
Xiang Wu ◽  
De Feng Wu ◽  
Wen Biao Wang
Keyword(s):  
Industrial Robot ◽  
Calibration Method ◽  
Reference Points ◽  
Measuring System ◽  
Calibration Error ◽  
Scanning System ◽  
System A ◽  
Laser Stripe ◽  
Object Inspection ◽  
Scanner Calibration

This paper focuses on the system for object inspection by use of a laser stripe scanner and an industrial robot. In order to ensure the precision of the scanning system, a one-stage calibration method is proposed. This scheme mainly utilizes a circular-marked board as calibration target and calibrated the scanner model and hand-to-scanner transformation simultaneously using the same reference points. Therefore the influences of the scanner calibration error on the hand-to-scanner calibration can be eliminated naturedly. Finally, some experimental results are reported and analyzed.

Simultaneous Flatness and Surface Roughness Measurement of a Plastic Sheet Using a Fan-Shaped Laser Beam Scanning System

2008 ◽  
Vol 381-382 ◽  
pp. 233-236 ◽  
Author(s):  
Fang Jung Shiou ◽  
Y.W. Deng
Keyword(s):  
Surface Roughness ◽  
Laser Beam ◽  
Test Object ◽  
Processing System ◽  
Measuring System ◽  
Scanning System ◽  
Beam Scanning ◽  
System A ◽  
Fringe Width ◽  
Laser Beam Scanning

A fan-shaped laser beam scanning measuring system based on the triangulation principle, was newly developed in this study to measure simultaneously the flatness and the surface roughness of a surface plate with good reflectivity after a suitable calibration. The developed system mainly consists of a micro-focus fan-shaped line laser, an image processing system, a PC-based 3-axis machine, and a PC. The height value of the object can be calculated, based on the offset between the position projected onto the object and the position projected onto the platform, after carrying out the height calibration with gauge blocks. According to the scattering theorem, a correlation between the surface roughness of the test object measured with a precision stylus instrument and the average fringe width projected onto the test object surface, has been constructed.

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