Design and Testing of a Compact Fluidic Layered Isolator for High-Frequency Helicopter Gearbox Isolation

2004 ◽  
Author(s):  
Joseph Szefi ◽  
Edward Smith ◽  
George Lesieutre
Keyword(s):  
High Frequency ◽  
Design And Testing

Design and Testing of a High Frequency Thermoacoustic Combustion Experiment

AIAA Journal ◽  
2021 ◽  
pp. 1-17
Author(s):  
Vahid Sharifi ◽  
Christian Beck ◽  
Bertram Janus ◽  
Andreas M. Kempf
Keyword(s):  
High Frequency ◽  
Combustion Experiment ◽  
Design And Testing

Design and Testing of a Linear-Driven Electro-Hydrostatic Actuator

2019 ◽  
Vol 141 (12) ◽  
Author(s):  
Zimeng Wang ◽  
Zongxia Jiao ◽  
Xinglu Li
Keyword(s):  
Flow Rate ◽  
Rate Equation ◽  
High Frequency ◽  
Reciprocating Motion ◽  
Series Of Experiments ◽  
Spool Valves ◽  
Design And Testing

Abstract This paper presents a novel hydrostatic actuator, which is named as linear-driven electro-hydrostatic actuator (LEHA). In an LEHA, the actuator is driven by a novel collaborative rectification pump (CRP), which incorporates two miniature cylinders and two spool valves. Specifically, the CRP is driven by two linear oscillating motors, which are designed and optimized to generate reciprocating motion at high frequency with adequate stroke. CRP offers a highly novel linear fluid pump with flexibility in bi-directionally driving. In this paper, schematic of LEHA is first presented and its kinematic flow rate equation is derived. Then the design of CRP, linear oscillating motor, as well as the whole LEHA prototype is introduced. Performance of the LEHA is demonstrated through a series of experiments and simulation, and analysis of the results is also included.

Design and testing of a high frequency air-cored resonance transformer

2013 ◽  
Vol 6 (1) ◽  
pp. 72 ◽  
Author(s):  
Ashoke Kumar Sen Gupta ◽  
Sajal Chandra Banik ◽  
Awadhesh Kumar Pandit ◽  
Md. Mazharul Islam
Keyword(s):  
High Frequency ◽  
Design And Testing

Wide-Band High-Frequency Antennas for Military Vehicles: Design and testing low-profile half-loop, inverted-L, and umbrella NVIS antennas.

2016 ◽  
Vol 58 (6) ◽  
pp. 64-74 ◽  
Author(s):  
Maxim Ignatenko ◽  
Saurabh A. Sanghai ◽  
Gregor Lasser ◽  
Bradley Allen ◽  
Richard Smith ◽  
...  
Keyword(s):  
High Frequency ◽  
Wide Band ◽  
Military Vehicles ◽  
Low Profile ◽  
Half Loop ◽  
Design And Testing

Design and testing of an annular array for very‐high‐frequency imaging

2004 ◽  
Vol 115 (5) ◽  
pp. 2377-2378 ◽  
Author(s):  
Jeffrey A. Ketterling ◽  
Sarayu Ramachandran ◽  
Frederic L. Lizzi ◽  
Orlando Aristizábal ◽  
Daniel H. Turnbull
Keyword(s):  
High Frequency ◽  
Very High Frequency ◽  
Annular Array ◽  
Design And Testing ◽  
Very High

The Microstructure of Steatite (Protoenstatite)

1985 ◽  
Vol 43 ◽  
pp. 236-237
Author(s):  
W. E. Lee ◽  
A. H. Heuer
Keyword(s):  
High Frequency ◽  
Glass Ceramics ◽  
Magnesium Silicate ◽  
Beam Current ◽  
Glassy Matrix ◽  
Angle Of Incidence ◽  
X Ray ◽  
Mechanical And Electrical Properties ◽  
Argon Ions ◽  
High Temperature Polymorph

IntroductionTraditional steatite ceramics, made by firing (vitrifying) hydrous magnesium silicate, have long been used as insulators for high frequency applications due to their excellent mechanical and electrical properties. Early x-ray and optical analysis of steatites showed that they were composed largely of protoenstatite (MgSiO3) in a glassy matrix. Recent studies of enstatite-containing glass ceramics have revived interest in the polymorphism of enstatite. Three polymorphs exist, two with orthorhombic and one with monoclinic symmetry (ortho, proto and clino enstatite, respectively). Steatite ceramics are of particular interest a they contain the normally unstable high-temperature polymorph, protoenstatite.Experimental3mm diameter discs cut from steatite rods (∼10” long and 0.5” dia.) were ground, polished, dimpled, and ion-thinned to electron transparency using 6KV Argon ions at a beam current of 1 x 10-3 A and a 12° angle of incidence. The discs were coated with carbon prior to TEM examination to minimize charging effects.

Simulations of high-resolution images of amorphous silicon films

1986 ◽  
Vol 44 ◽  
pp. 544-545
Author(s):  
G. Y. Fan ◽  
J. M. Cowley
Keyword(s):  
Electron Microscope ◽  
High Frequency ◽  
Fourier Transformation ◽  
Amorphous Materials ◽  
Low Frequency ◽  
Chromatic Aberration ◽  
Structure Information ◽  
Frequency Components ◽  
High Resolution Images ◽  
Spatial Frequency Spectrum

It is well known that the structure information on the specimen is not always faithfully transferred through the electron microscope. Firstly, the spatial frequency spectrum is modulated by the transfer function (TF) at the focal plane. Secondly, the spectrum suffers high frequency cut-off by the aperture (or effectively damping terms such as chromatic aberration). While these do not have essential effect on imaging crystal periodicity as long as the low order Bragg spots are inside the aperture, although the contrast may be reversed, they may change the appearance of images of amorphous materials completely. Because the spectrum of amorphous materials is continuous, modulation of it emphasizes some components while weakening others. Especially the cut-off of high frequency components, which contribute to amorphous image just as strongly as low frequency components can have a fundamental effect. This can be illustrated through computer simulation. Imaging of a whitenoise object with an electron microscope without TF limitation gives Fig. 1a, which is obtained by Fourier transformation of a constant amplitude combined with random phases generated by computer.

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