منابع مشابه
Characterizing an Improved Broad Band Impedance*
A phenomenological model of broadband impedance containing two free parameters has been recently proposed. This paper attempts to assign physical charaterizations to these free parameters by relating them to the geometric dimensions of a stand-alone cavity structure. Contributed paper at the Broadband Impedance Measurements and ModelZing Workshop SLAC, Stanford, USA February 28 March 2, 2000 ‘W...
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Acoustic measurements provide convenient non-invasive means for the characterisation of materials. We show here for the first time how a commercial impedance tube can be used to provide accurate measurements of the velocity and attenuation of acoustic waves in liquid foams, as well as their effective "acoustic" density, over the 0.5-6kHz frequency range. We demonstrate this using two types of l...
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The Method of Moments, implemented in 2.5-D with the multilayer Green’s Function, or implemented as a fully 3-D solution of Maxwell’s equations, is a popular method for microwave antenna simulations. Commercial software was used to simulate two different designs for a single aperture-coupled patch antenna element. The simulation results are compared with experimental data measured for antenna p...
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A desired dynamic behavior of constrained manipulators can be achieved by means of impedance control and various implementations of fixed controllers have been proposed. In this paper, and adaptive implementation is presented as an alternative to reduce the design sensitivity due to manipulator mismatch. The adaptive controller globally achieves the impedance objective for the nonlinear dynamic...
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This paper presents the experimental and analytical modal analysis of a concrete-filled (CFT) tube half-through arch bridge, with the span length of 90m, located at the center of Xining City, Qinghai province, China. Dynamic field test was carried out just prior to the official opening of bridge in order to inspect the dynamic characteristics of the bridge and make a baseline record for the fut...
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ژورنال
عنوان ژورنال: The Journal of the Acoustical Society of America
سال: 2003
ISSN: 0001-4966
DOI: 10.1121/1.1572140