Full Download An Efficient Model for Coupling Structural Vibrations with Acoustic Radiation - National Aeronautics and Space Administration | PDF
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An Efficient Model for Coupling Structural Vibrations with
An Efficient Model for Coupling Structural Vibrations with Acoustic Radiation
An efficient model for coupling structural vibrations with
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Dec 30, 2016 in order to verify its applicability, a double-cavity model and an experiment corresponding to it are designed.
The scattering of an incident wave by a flexible panel is studied. The panel vibration is governed by the nonlinear plate equations while the loading on the panel, which is the pressure difference across the panel, depends on the reflected and transmitted waves. Two models are used to calculate this structural-acoustic interaction problem.
The interaction of an ultrashort intense laser pulse with a subwavelength rectangular grating target is studied by an analytical model and particle-in-cell simulations. Such interaction excites strong periodic charge separation at the grating surface. With the presence of formed electrostatic fields, the laser field can intensively heat electrons, causing near 100% light absorption.
In our testing, they proved their worth by yielding up to 10 additional miles of range.
We have demonstrated a highly efficient switch with an rf control field, the coupling strength can be in principle tuned to zero in both a qubit–qubit system and a qubit–resonator system.
If you've ever wondered why your partner just doesn't seem to understand you, this model will help. Read full profile have you ever felt as though your partner just doesn’t appreciat.
A computationally efficient and accurate substrate noise coupling model for heavily doped cmos processes is presented and validated with simulations and experimental data.
Tinysleepnet: an efficient deep learning model for sleep stage scoring based on raw single-channel eeg by akara supratak and yike guo from the faculty of ict, mahidol university and imperial college london respectively - akaraspt/tinysleepnet.
In this paper, the problem of coupling between panel vibration and near and far field acoustic radiation is studied. The panel vibration is governed by the non-linear plate equations while the loading on the panel, which is the pressure difference across the panel, depends on the reflected and transmitted waves. Two models are used to solve this structural-acoustic interaction problem.
These manifestations of front-rear coupling can be explained by a simple quantitative model incorporating reversible actin-myosin interactions with a rearward-flowing actin network.
A computationally efficient model for static self-heating and thermal coupling in a multi-finger bipolar transistor is proposed.
Can the scor model drive your supply chain efficiencies? the supply chain operations reference model might be a world leader, but is it right for you? the supply chain operations reference model or scor has been—for decades—the supply chain.
The demonstrated conjugation efficiency of 89 % during the synthesis of our lead lx‐adc on a multigram scale was remarkably high. The method allows a straightforward coupling of various payloads to native mabs without any chemical pre‐modification or genetical engineering of the antibodies.
Efficient way of transferring power wirelessly is through inductive coupling between transmitter and receiver which are just few millimeter apart from each other. Some other methods that are not much efficient are power harvesting, optical beam transmission, acoustic coupling.
A numerical model has been developed employing an orthogonal stream-tube gridding system for the investigation of mixing patterns in meandering rivers. It uses a measured velocity field to solve the advection-diffusion equation.
Coupling of laser light into an optical fiber end can be modeled as the excitation of optical fiber waveguide modes by incident light propagating in gaussian beam modes. For single mode fibers, the efficiency of coupling light into the fundamental waveguide mode is of interest.
An example of application of this theorem is given in the next subsection.
A donor chromophore, initially in its electronic excited state, may transfer energy to an acceptor chromophore through nonradiative dipole–dipole coupling. The efficiency of this energy transfer is inversely proportional to the sixth power of the distance between donor and acceptor, making fret extremely sensitive to small changes in distance.
We disentangled the output coupling efficiency from reabsorption, phase matching and the microscopic efficiency with this model, unveiling a trade-off between xuv generation efficiency and output coupling, where the former reaches its optimum values when the gas target is positioned near the focus of the driving beam and the latter favors.
In this case, a coupled model that mainly relies on the previous 1d model and a finer 2d model for more localised use can be implemented rather than a full 2d model. Of course, the more complex the bidimensional model of the domain under consideration (which can contain a large number of dykes, power-plants, etc) the more fruitful and the more justified the use of a coupled model.
Efficient analytic model to optimum design laser resonator and optical coupling system of diode-end-pumped solid-state lasers: influence of gain medium length and pump beam m 2 factor shayeganrad, gholamreza.
The coupling efficiency theory model of the spatial light into few-mode fiber in the different influence factor is established. Takes two-mode fiber for example to study the relative aperture.
The model is firstly proposed considering a single polarization scheme, and is then generalized to a dual polarization scheme and to account for the polarization coupling between cores.
We have designed and fabricated an out-of-plane coupler for butt-coupling from fiber to compact planar waveguides. The coupler is based on a short second-order grating or photonic crystal, etched in a waveguide with a low-index oxide cladding. The coupler is optimized using mode expansion-based simulations. Simulations using a 2-d model show that up to 74% coupling efficiency between single.
A high-fidelity cargo airdrop simulation requires the accurate modeling of the contact dynamics between an aircraft and its cargo. This paper presents a general and efficient contact-friction model for the simulation of aircraft-cargo coupling dynamics during an airdrop extraction phase. The proposed approach has the same essence as the finite element node-to-segment contact formulation, which.
Achieved by tuning coupling coefficients between the loop-coil and the internal coil, and verified against theoretical data by simulation in an electric automatic tool. Applying this technique results, efficiency of over 90% at the small coupling distance at a fixed operating frequency.
An efficient finite element analysis/computational fluid dynamics (fea/cfd) thermal coupling technique has been developed and demonstrated.
Numerical results are obtained using the two models for linear and nonlinear panel vibrations. The predictions given by these two models are in good agreement but the computational time needed for the fully coupled model is 60 times longer than that for the decoupled model coupling, acoustic radiation, structural vibration, linear, nonlinear.
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