Strain-gauge dynamometer

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

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

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.

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

Dynamische Venenfunktionstests auf dem Prüfstand

Phlebologie ◽  
2002 ◽  
Vol 31 (04) ◽  
pp. 85-90 ◽  
Author(s):  
H.-M. Häfner ◽  
H. Bablich ◽  
G. Rassner ◽  
M. Jünger ◽  
A. Steins
Keyword(s):  
Strain Gauge ◽  
Automatische Auswertung

Zusammenfassung Ziel: Überprüfung der Korrelation der photooptischen Venenfunktionstests Lichtreflexionsrheographie (LRR), digitale Photoplethysmographie (DPPG) und der Quecksilberdehnungsstreifen- Plethysmographie (Hg-strain gauge) mit der Phlebodynamometrie (PDM). Methode: Die simultane Messung von LRR, DPPG, Hg-strain gauge und PDM wurde an 34 Patienten mit chronischer venöser Insuffizienz in den klinischen Stadien I bis III nach Widmer an insgesamt 39 Unterschenkeln vorgenommen. Die Messungen erfolgten während Dorsalextension des Fußes in sitzender und während Plantarflexion des Fußes in stehender Position. Als Parameter für die Ermittlung des Korrelationskoeffizienten wurden die Wiederauffüllzeiten t0 und t1/2 sowie die venöse Abpumpleistung ermittelt. Ergebnisse: Unabhängig von Körperposition und Anlage von Tourniquets erreichten die Korrelationen für alle Messverfahren und Parameter Werte zwischen r = 0,76 (t0 LRR) und r = 0,05 (Abpumpleistung DPPG automatische Auswertung). Eine gute Korrelation von t0 wurde in stehender Körperposition unabhängig von der Anlage der Tourniquets beim Hg-strain gauge (r = 0,49) und LRR (r = 0,51) erreicht. Diese Korrelation verbesserte sich in sitzender Körperposition. Die schlechteste Korrelation wurde bei der DPPG ermittelt (r = 0,25 in stehender, r = 0,51 in sitzender Position). Eine Verbesserung der Korrelation wurde beim DPPG durch die manuelle Auswertung der Kurven erreicht. Schlussfolgerung: Sowohl die Wahl des Untersuchungsverfahrens wie auch das gewählte Belastungsprogramm können erhebliche Auswirkungen auf die Korrelation mit der PDM haben. Unsere Ergebnisse zeigen, dass bei der Bewertung der Wiederauffüllzeiten t0 und t1/2 der Hg-strain gauge und die LRR die höchste Korrelation bei Dorsalextension in sitzender Körperposition mit der PDM aufweisen.

Diagnosis of Deep Vein Thrombosis by Combination of Doppler Ultrasound Flow Examination and Strain Gauge Plethysmography

1982 ◽  
Vol 47 (02) ◽  
pp. 141-144 ◽  
Author(s):  
H Bounameaux ◽  
B Krähenbühl ◽  
S Vukanovic
Keyword(s):  
Deep Vein Thrombosis ◽  
Negative Predictive Value ◽  
Doppler Ultrasound ◽  
Strain Gauge ◽  
Predictive Value ◽  
Lower Limbs ◽  
Vein Thrombosis ◽  
Non Invasive ◽  
Strain Gauge Plethysmography ◽  
Deep Vein

SummaryDoppler ultrasound flow examination, strain gauge plethysmography and contrast venography were performed in 160 lower limbs of 80 in-patients. Deep vein thrombosis (DVT) was suspected in 87 limbs. Using measurement of venous stop-flow pressure, the Doppler method had an overall sensitivity of 83%. By combined use of Doppler and Plethysmography, sensitivity was increased to 96%. Specificity was 62% and 51%, respectively. With a positive and a negative predictive value of 80% and 73%, respectively, the combination of both non-invasive methods cannot reliably replace venography in the diagnosis of DTV, although all (40/40) thromboses proximal to or involving the popliteal segment were detected by either Doppler and Plethysmography or both.After exclusion of 14 patients (18%) suffering from conditions known to alter the results of these non-invasive methods, the positive predictive value of abnormal findings in both Doppler and Plethysmography was increased to 94% for suspected limbs, whilst negative predictive value of both negative Doppler and Plethysmography was 90%, allowing the avoidance of venography in these patients.

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