Effect of temperature on strain-gauge dynamometer characteristics

1977 ◽  
Vol 20 (8) ◽  
pp. 1194-1196
Author(s):  
A. V. Ignatov ◽  
L. I. Kosov
Keyword(s):  
Strain Gauge ◽  
Effect Of Temperature ◽  
Strain Gauge Dynamometer

Strain-gauge dynamometer

1979 ◽  
Vol 22 (6) ◽  
pp. 684-686
Author(s):  
Yu. A. Shevtsov
Keyword(s):  
Strain Gauge ◽  
Strain Gauge Dynamometer

High-speed weighing system with a multicomponent strain-gauge dynamometer

1990 ◽  
Vol 33 (7) ◽  
pp. 673-675
Author(s):  
V. V. Bogdanov ◽  
A. S. Romashkin ◽  
B. A. Derkach
Keyword(s):  
Strain Gauge ◽  
High Speed ◽  
Strain Gauge Dynamometer

scholarly journals Validity and reliability of strain gauge measurement of volitional quadriceps force in patients with COPD

2017 ◽  
Vol 14 (3) ◽  
pp. 289-297 ◽  
Author(s):  
Fernanda Machado Rodrigues ◽  
Heleen Demeyer ◽  
Miek Hornikx ◽  
Carlos Augusto Camillo ◽  
Ebru Calik-Kutukcu ◽  
...  
Keyword(s):  
Strain Gauge ◽  
Femoral Nerve ◽  
Correlation Coefficients ◽  
Voluntary Contraction ◽  
Chronic Obstructive ◽  
Validity And Reliability ◽  
Obstructive Pulmonary Disease ◽  
Quadriceps Force ◽  
Strain Gauge Dynamometer ◽  
Strain Gauge Measurements

This study investigated the validity and reliability of fixed strain gauge measurements of isometric quadriceps force in patients with chronic obstructive pulmonary disease (COPD). A total cohort of 138 patients with COPD were assessed. To determine validity, maximal volitional quadriceps force was evaluated during isometric maximal voluntary contraction (MVC) manoeuvre via a fixed strain gauge dynamometer and compared to (a) potentiated non-volitional quadriceps force obtained via magnetic stimulation of the femoral nerve (twitch (Tw); n = 92) and (b) volitional computerized dynamometry (Biodex; n = 46) and analysed via correlation coefficients. Test–retest and absolute reliability were determined via calculations of intra-class correlation coefficients (ICCs), smallest real differences (SRDs) and standard errors of measurement (SEMs). For this, MVC recordings in each device were performed across two test sessions separated by a period of 7 days ( n = 46). Strain gauge measures of MVC demonstrated very large correlation with Tw and Biodex results ( r = 0.86 and 0.88, respectively, both p < 0.0001). ICC, SEM and SRD were numerically comparable between strain gauge and Biodex devices (ICC = 0.96 vs. 0.93; SEM = 8.50 vs. 10.54 N·m and SRD = 23.59 vs. 29.22 N·m, respectively). The results support that strain gauge measures of quadriceps force are valid and reliable in patients with COPD.

scholarly journals Data Measuring System for Torque Measurement on Running Shafts Based on a Non-Contact Torsional Dynamometer

2019 ◽  
Vol 6 (2) ◽  
pp. e17-e23 ◽  
Author(s):  
S. M. Vanyeyev ◽  
D. V. Miroshnichenko ◽  
T. S. Rodymchenko ◽  
M. Protsenko ◽  
D. V. Smolenko
Keyword(s):  
Strain Gauge ◽  
High Speed ◽  
Measurement Data ◽  
Power Measurement ◽  
Measuring System ◽  
Bench Test ◽  
Torque Measurement ◽  
Performance Factors ◽  
Strain Gauge Dynamometer ◽  
And Performance

The need for power measurement transmitted by the running shaft has led to the need for using devices for measuring torque on the shaft. Of particular importance is the power measurement on high-speed machines, wherein some cases conventional measurement systems are either unsuitable or have low accuracy. Currently, data measuring systems are widely used in the researches of turbomachines. They allow to receive, process, transmit, store and display measurement data. Their application is relevant in relation to the priority of experimental study and subsequent modeling of characteristics and performance factors of expansion machines. The purpose of this research is a design and generation of the data measuring system for measuring torque on the running shaft of vortex expansion machines using a non-contact torsional dynamometer (strain-gauge clutch). The research has considered the results of the development of data measuring system, performed a theoretical analysis and presented the results of the practical application of the non-contact strain-gauge dynamometer designed for torque measurement on the shaft of low-power expansion machines when operating under bench test conditions. Has dealt with the problems of development, calibration. Keywords: data measuring system, torque, coupling, resistive-strain sensor, vortex expansion machine.

Effect of temperature and continuous stimulation on gastrocnemius of the frog

1963 ◽  
Vol 205 (6) ◽  
pp. 1299-1303 ◽  
Author(s):  
P. F. Osgood ◽  
W. R. Brewster
Keyword(s):  
Metabolic Activity ◽  
Strain Gauge ◽  
Rana Pipiens ◽  
Effect Of Temperature ◽  
Continuous Stimulation ◽  
Increasing Temperature ◽  
Gastrocnemius Muscles

Gastrocnemius muscles of the winter frog ( Rana pipiens) were stimulated directly, at a rate of 2/sec at temperatures of 10, 15, 20, 25, and 30 C and at 1/sec at 5 C. Isometric strain-gauge recordings showed that at all temperatures, when developed tension remained constant, the duration of contraction remained relatively unchanged, while the duration of relaxation progressively increased. The prolongation of relaxation was most rapid and striking at 5 C, becoming progressively less with increasing temperature. These findings suggest that relaxation may be the phase of greatest metabolic activity.

Applying an Improving Measurement of Cutting Force to Study Machinability of Gray Cast Iron

2012 ◽  
Vol 239-240 ◽  
pp. 640-644
Author(s):  
Rui Wu ◽  
Dan Wen Zhang ◽  
Juan Sun ◽  
Feng Zhang Ren ◽  
Yu Fei Wang ◽  
...  
Keyword(s):  
Cast Iron ◽  
Cutting Force ◽  
Strain Gauge ◽  
Gray Cast Iron ◽  
Low Cost ◽  
Calibration Method ◽  
Gray Cast ◽  
Cost Cutting ◽  
Calibration Device ◽  
Strain Gauge Dynamometer

In order to study the machinability of gray cast iron, the cutting force must be precision measure. An improving measurement based on strain gauge dynamometer has been proposed in this paper, the measurement changed the traditional calibration method of strain gauge dynamometer. A set of new calibration device have been designed. Use the device, the process of calibration could be made after the strain-gauge dynamometer for cutting force measuring fixed on lathe, in this way, the states of calibration and measuring in experiment achieved same, and the error of measuring which had been begot by the differ states of calibration and measuring could be eliminated. The results of experiment show that the method presented in this paper achieved high precision and low cost cutting force measuring, and the results of cutting force measuring could be used for estimating machinability of gray cast iron.

Strain gauge dynamometer

1961 ◽  
Vol 4 (6) ◽  
pp. 451-452
Author(s):  
L. G. �tkin
Keyword(s):  
Strain Gauge ◽  
Strain Gauge Dynamometer

Nucleation of Disorder in Fe3Al Alloys

1967 ◽  
Vol 25 ◽  
pp. 312-313
Author(s):  
P. R. Swann ◽  
W. R. Duff ◽  
R. M. Fisher
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Annealing Temperature ◽  
Antiphase Domain ◽  
Effect Of Temperature ◽  
Domain Structures ◽  
Transmission Electron ◽  
Domain Boundaries ◽  
Higher Temperature ◽  
The One

Recently we have investigated the phase equilibria and antiphase domain structures of Fe-Al alloys containing from 18 to 50 at.% Al by transmission electron microscopy and Mössbauer techniques. This study has revealed that none of the published phase diagrams are correct, although the one proposed by Rimlinger agrees most closely with our results to be published separately. In this paper observations by transmission electron microscopy relating to the nucleation of disorder in Fe-24% Al will be described. Figure 1 shows the structure after heating this alloy to 776.6°C and quenching. The white areas are B2 micro-domains corresponding to regions of disorder which form at the annealing temperature and re-order during the quench. By examining specimens heated in a temperature gradient of 2°C/cm it is possible to determine the effect of temperature on the disordering reaction very precisely. It was found that disorder begins at existing antiphase domain boundaries but that at a slightly higher temperature (1°C) it also occurs by homogeneous nucleation within the domains. A small (∼ .01°C) further increase in temperature caused these micro-domains to completely fill the specimen.

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