Efficacy of High-Speed Strain Gauge Measurements in Analysis of Rotating Detonation Combustors

2022 ◽  
Author(s):  
Tyler C. Pritschau ◽  
Vijay Anand ◽  
Alec R. Gaetano ◽  
Jorge J. Betancourt ◽  
Rachel Wiggins ◽  
...  
Keyword(s):  
Strain Gauge ◽  
High Speed ◽  
Strain Gauge Measurements ◽  
Rotating Detonation

Effects of vessel baffling on the drawdown of floating solids

2009 ◽  
Vol 63 (2) ◽  
Author(s):  
Joanna Karcz ◽  
Beata Mackiewicz
Keyword(s):  
Experimental Data ◽  
Power Consumption ◽  
Strain Gauge ◽  
High Speed ◽  
Vessel Diameter ◽  
Rushton Turbine ◽  
Agitated Vessel ◽  
Dimensionless Equation ◽  
Inner Diameter ◽  
Floating Particles

AbstractThe effects of baffling of an agitated vessel on the production of floating particles suspension are presented in this paper. Critical agitator speed, needed for particles dispersion in a liquid agitated in a vessel of the inner diameter of 0.295 m, was determined. The just drawdown agitator speeds were defined analogously to the Zwietering criterion. Specific agitation energy was calculated from the power consumption experimental data obtained by means of the strain gauge method. The experiments were carried out for twelve configurations of the baffles differing in number, length and their arrangement in the vessels. The following high-speed impellers were used: up- and downpumping six blade pitched blade turbines, Rushton turbine, and propeller. The impeller was located in the vessel in the height equal to two-thirds or one-third of the vessel diameter from the bottom of the vessel. The results were described in the form of a dimensionless equation.

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

scholarly journals High-Speed Diagnostics in a Natural Gas–Air Rotating Detonation Engine

2020 ◽  
Vol 36 (4) ◽  
pp. 498-507 ◽  
Author(s):  
Christopher L. Journell ◽  
Rohan M. Gejji ◽  
Ian V. Walters ◽  
Aaron I. Lemcherfi ◽  
Carson D. Slabaugh ◽  
...  
Keyword(s):  
Natural Gas ◽  
High Speed ◽  
Rotating Detonation Engine ◽  
Detonation Engine ◽  
Rotating Detonation

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.

Direct and Indirect Strain Measurement of Flexible Printed Circuit Boards - fPCBs

2013 ◽  
Vol 655-657 ◽  
pp. 88-93 ◽  
Author(s):  
Luciano Arruda ◽  
Cristiano Coimbra ◽  
João Marco Andolfatto
Keyword(s):  
Strain Gauge ◽  
Strain Measurement ◽  
High Speed ◽  
Printed Circuit Boards ◽  
Direct Method ◽  
Indirect Measurement ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Polyimide Substrate ◽  
Flexible Printed Circuit

This work is related to reliability of strain measurement in flexible printed circuit boards (fPCBs) made with polyimide substrate. It was observed that the fPCBs are very sensitive to strain mounting stiffness. The indirect measurement method will be done employing High Speed Camera (HSP). The direct method will be formulated in two ways: 1) conventional strain gauge glued in an fPCBs; 2) printed strain gauge in a polyimide substrate. This paper will point out mistakes and show advantages when using different method to extract the deformation field of the selected area in a flexible thin film.

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