Error estimation for strain-gauge measurements in heat-resistance tests

1978 ◽  
Vol 21 (7) ◽  
pp. 968-969
Author(s):  
G. A. Tsareva
Keyword(s):  
Heat Resistance ◽  
Error Estimation ◽  
Strain Gauge ◽  
Strain Gauge Measurements ◽  
Resistance Tests

Analysis for strain gauge measurements of magnetostriction in single crystal iron

Physica B+C ◽  
1976 ◽  
Vol 81 (1) ◽  
pp. 24-34 ◽  
Author(s):  
R.D. Greenough ◽  
C. Underhill ◽  
P. Underhill
Keyword(s):  
Single Crystal ◽  
Strain Gauge ◽  
Strain Gauge Measurements

Validation of image-enhanced in vivo microCT based FE models by strain gauge measurements

2006 ◽  
Vol 39 ◽  
pp. S428 ◽  
Author(s):  
L. Muraru ◽  
S.V.N. Jaecques ◽  
J. Demol ◽  
I. Naert ◽  
J. Vander Sloten
Keyword(s):  
Strain Gauge ◽  
Strain Gauge Measurements

The Determination of Fan Blade Aerodynamic Loading From a Measured Response

2015 ◽  
Author(s):  
Jacques Muiyser ◽  
Daniel N. J. Els ◽  
Sybrand J. van der Spuy ◽  
Albert Zapke
Keyword(s):  
Fourier Series ◽  
Strain Gauge ◽  
Full Scale ◽  
Aerodynamic Forces ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
Aerodynamic Loading ◽  
Fan Blade ◽  
Strain Gauge Measurements ◽  
Measured Response

Large-scale cooling system fans often operate under distorted inlet air flow conditions due to the presence of other fans and the prevalent wind conditions. Strain gauge measurements have been used to determine the blade loading as a result of the unsteady aerodynamic forces. However, these measurements are of the blade’s response to the aerodynamic forces and include the deformation as a result of the first natural frequency being excited. When considering the dominant first natural frequency and bending mode of the fan blade, one can approximate the fan blade as a cantilever beam that acts as a single degree-of-freedom system. The response of a single degree-of-freedom system can be calculated analytically for any excitation if the system’s properties are known. The current investigation focuses on using these equations to create an algorithm that can be applied to the measured response of a fan blade to then extract the aerodynamic forces exciting it. This is performed by using a simple non-linear, least-squares optimization algorithm to fit a complex Fourier series to the response and using the coefficients of each harmonic term to determine the Fourier series representing the excitation function. The algorithm was first tested by applying it to the response of a finite element cantilever beam representing a simplified model of the fan blade. Good results were obtained for a variety of excitation forces and as such the algorithm was then applied to the measured response of a full-scale fan blade. The full-scale blade was excited with a shaker where the forcing function could be accurately controlled. Once validated, the algorithm was applied to a set of strain gauge measurements that were recorded at a full-scale fan while in operation. The reconstructed aerodynamic loading showed increased forces when the blade passed beneath the fan bridge as well as when it approached the windward side of the casing.

Strain gauge measurements of the precast concrete lining of a shield-driven tunnel

2013 ◽  
Vol 55 (2) ◽  
pp. 88-95 ◽  
Author(s):  
K Schotte ◽  
H De Backer ◽  
T Nuttens ◽  
A De Wulf ◽  
P Van Bogaert
Keyword(s):  
Strain Gauge ◽  
Precast Concrete ◽  
Concrete Lining ◽  
Strain Gauge Measurements

scholarly journals Large bore engine connecting rod fretting analysis

2017 ◽  
Vol 50 (3) ◽  
pp. 239-243 ◽  
Author(s):  
Antti Mäntylä ◽  
Jussi Göös ◽  
Anton Leppänen ◽  
Tero Frondelius
Keyword(s):  
Friction Coefficient ◽  
Strain Gauge ◽  
Contact Analysis ◽  
Connecting Rod ◽  
Coefficient Distribution ◽  
Strain Gauge Measurements

A detailed contact analysis of a large connecting rod was performed to evaluatethe fretting risk in the big end. Simulation was carried out in Abaqus considering all relevantboundary conditions, such as assembly loads, housing machining and dynamics from a exiblemultibody simulation with elastohydrodynamic bearings. Being one of the most importantvariables, the local coeffcient of friction (COF) and its evolution is calculated during the solutionby using a subroutine in Abaqus. The model is validated by strain gauge measurements in arunning engine. The resulted friction coefficient distribution matches well with the ndings froma laboratory engine. The described methodology increases the accuracy of the fretting damageprediction by using a more realistic friction coefficient denition.

scholarly journals Evaluation of Reliability of Strain Gauge Measurements for Geosynthetics

2015 ◽  
Vol 14 (4) ◽  
pp. 87-96 ◽  
Author(s):  
Sam-Deok Cho ◽  
Kwang-Wu Lee ◽  
Zhuang Li ◽  
Uk-Gie Kim
Keyword(s):  
Strain Gauge ◽  
Strain Gauge Measurements
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