Experimental determination of the coefficient in the steady state current equation for spherical segment microelectrodes

1989 ◽  
Vol 61 (11) ◽  
pp. 1305-1308 ◽  
Author(s):  
Zbigniew. Stojek ◽  
Janet. Osteryoung
Keyword(s):  
Steady State ◽  
Experimental Determination ◽  
Spherical Segment ◽  
Steady State Current ◽  
Current Equation

An Experimental Determination of the Relationship between Lift and Aerodynamic Power in Calliphora Erythrocephala and Phormia Regina

1972 ◽  
Vol 56 (1) ◽  
pp. 31-36
Author(s):  
JAMES WOOD
Keyword(s):  
Steady State ◽  
Experimental Determination ◽  
Insect Flight ◽  
Phormia Regina ◽  
Calliphora Erythrocephala ◽  
The Relationship

Lift and aerodynamic power were calculated for Calliphora and Phormia using assumptions which maximized and minimized the ratio of aerodynamic power to lift. The ratios of aerodynamic power to lift calculated by these methods, which do not rely on the assumption that steady-state aerodynamics applies to insect flight, are in agreement with results calculated by others using steady-state aerodynamics.

Parallel analysis of thermal field in a layered DC cable

2014 ◽  
Vol 24 (3) ◽  
pp. 613-626
Author(s):  
Jerzy Golebiowski ◽  
Robert Piotr Bycul
Keyword(s):  
Steady State ◽  
Field Distribution ◽  
Time Constant ◽  
Thermal Field ◽  
Thermal Time ◽  
Content Type ◽  
The Core ◽  
Thermal Time Constant ◽  
Steady State Current

Purpose – The purpose of this paper is to prepare procedures for determination of characteristics and parameters of DC cables on the basis of transient and steady thermal field distribution in their cross-sections. Design/methodology/approach – Steady-state current rating was computed iteratively, with the use of steady thermal field distribution in the cable. The iterative process was regulated with respect to this field by changes of the mean surface temperature of the sheath of the cable. It was also controlled with respect to the unknown current rating by deviations of the temperature of the core from the maximum sustained temperature of the insulation (material zone) adjacent to the core. Heating curves were determined (in arbitrarily selected points of the cross-section of the cable) by a parallel algorithm described thoroughly in the first part of the paper. The algorithm was used for computing of transient thermal field distribution throughout the whole cross-section. Thermal time constant distributions were determined by the trapezium rule, where the upper integration limit of respective thermal field distributions was being changed. Findings – Using the methods prepared the following characteristics/parameters of the cable were determined: steady-state current rating, spatial-time heating curves, mean thermal time constant distribution. The results were verified and turned to be in conformance with those of the IEC 287 Standard and a commercial software – Nisa v. 16. Speedup and efficiency of the parallel computations were calculated. It was concluded that the parallel computations took less time than the sequential ones. Research limitations/implications – The specialized algorithms and software are dedicated to cylindrical DC cables. Practical implications – The knowledge of the determined characteristics and parameters contributes to optimal exploitation of a DC cable during its use. Originality/value – The algorithms of determination of the steady-state current rating and thermal time constant are original. The software described in the appendix has also been made by the authors.

Experimental Determination of Oscillatory Lift and Moment Distributions on Fully Submerged Flexible Hydrofoils

1963 ◽  
Vol 7 (04) ◽  
pp. 24-41
Author(s):  
Guido E. Ransleben ◽  
H. Norman Abramson
Keyword(s):  
Steady State ◽  
Wind Tunnel ◽  
Aspect Ratio ◽  
Experimental Determination ◽  
Theoretical Predictions ◽  
Wind Tunnel Data

Measured span wise distributions of steady state and oscillatory lift and moment on fully submerged cantilever hydrofoils are presented. The hydrofoils were of aspect ratio 5 rectangular platform, and were towed at speeds sufficiently low to avoid cavitation. The data are compared with theoretical predictions and wind-tunnel data previously obtained at higher values of reduced velocity.

The experimental determination of trajectories in geometrically similar plastic flows

1978 ◽  
Vol 13 (1) ◽  
pp. 29-34 ◽  
Author(s):  
R N Roth
Keyword(s):  
Steady State ◽  
Experimental Determination ◽  
Experimental Method ◽  
Quasi Steady State ◽  
Experimental Accuracy ◽  
Geometric Similarity ◽  
Orthogonal Grid ◽  
Wedge Indentation ◽  
Strain Wedge

A new experimental method is presented for determining trajectories of flow for non-steady-state processes which exhibit geometric similarity (quasi-steady-state processes (1)∗). One process that is normally regarded as quasi-steady-state (plane strain wedge indentation) is investigated using this method. It is shown that this process satisfies the requirements of geometric similarity within experimental accuracy. Results are presented for wedge angles of 30°, 60° and 90° and a range of indentation depths up to approximately 3 mm. Finally, it is suggested how this method can be combined with well-known orthogonal-grid techniques to provide information for the calculation of effective strains throughout the deforming region.

Experimental determination of adhesion and slip areas in rolling contact

1970 ◽  
Vol 5 (3) ◽  
pp. 193-199 ◽  
Author(s):  
E Ollerton ◽  
R Pigott
Keyword(s):  
Steady State ◽  
Experimental Determination ◽  
Experimental Technique ◽  
Contact Area ◽  
Rapid Determination ◽  
Glass Plate ◽  
Rolling Contact ◽  
Ground Glass ◽  
Steady State Rolling

An experimental technique has been developed to allow the rapid determination of adhesion and slip areas in steady-state rolling contact. The technique consists in rolling solid black-rubber toroids on a ground-glass plate under carefully controlled conditions. It enables the division of the contact area into slip and adhesion areas to be observed and photographed whilst rolling is taking place. A loading frame was devised to enable rolling with longitudinal shearing traction, rolling with transverse creep, and rolling with spin to be investigated either separately or in combinations. The results of the experiments have been compared with existing theories, and some conclusions as to the accuracy of the theories have been made.

Mechanical and Electrical Run-Out Removal on a Precision Rotor-Vibration Research Spindle

1997 ◽  
Vol 119 (2) ◽  
pp. 216-220 ◽  
Author(s):  
G. A. Horattas ◽  
M. L. Adams ◽  
F. Dimofte
Keyword(s):  
Steady State ◽  
Experimental Determination ◽  
Journal Bearing ◽  
Dynamic Performance ◽  
Data Acquisition System ◽  
Small Range ◽  
Rotor Vibration ◽  
System 1 ◽  
Better Than

Experimental determination of both steady-state and dynamic performance of a journal bearing requires the use of a high precision spindle with a vanishingly small range of run-out. This was achieved by first eliminating the mechanical run-out of the spindle by grinding the journal specimen while rotating in place. Once the mechanical run-out was removed, the electrical run-out sensed by the displacement proximity-probe-transducers was also removed. Using this procedure the mechanical and electrical run-outs of a research spindle were reduced to less than 0.2 micron (10 μin.), which is better than the resolution of the data acquisition system, 1 micron (50 μin.).

Experimental Determination of Steady and Unsteady Loads on a Submerged Supercavitating Hydrofoil

1968 ◽  
Vol 12 (02) ◽  
pp. 89-104
Author(s):  
Guido E. Ransleben
Keyword(s):  
Steady State ◽  
Aspect Ratio ◽  
Rigid Body ◽  
Experimental Determination ◽  
Data Reduction ◽  
Noise Levels ◽  
Considerable Difficulty ◽  
High Noise ◽  
Body Rolling

Measured spanwise distributions of steady-state and oscillatory lift and moment on a fully submerged supercavitating hydrofoil are presented. The foil had a rectangular planform of aspect ratio 5, and was excited in rigid-body rolling and pitching modes for the oscillatory tests. Considerable difficulty was experienced in the data reduction because of high noise levels, but a significant amount of data was recovered. All tests were made at a single angle of attack of 1 2 deg.

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