Topic
Sine wave
About: Sine wave is a research topic. Over the lifetime, 12183 publications have been published within this topic receiving 93013 citations. The topic is also known as: sinusoid.
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TL;DR: In this article, the basis of the standing wave phenomenon and its consequences for both wave tank and computer simulation work are described. And two alternative techniques of directional wave generation are discussed; their effects on point and directional wave measurements are discussed.
47 citations
TL;DR: In this article, a five-bladed Savonius rotor was used to extract energy from the orbiting particles in a two-dimensional wave channel by varying the frequency of the wave generator, which produced sinusoidal waves.
47 citations
TL;DR: The results demonstrate that the optimal frequencies for capacitance measurements are higher than previously believed and it is demonstrated that the capacitance noise at high frequencies can be reduced by compensating for the voltage drop of the sine wave across the series resistance.
47 citations
TL;DR: In this article, the authors describe experiments exploring the three-dimensional (3D) Rayleigh-Taylor instability at a blast-wave-driven interface, which is well scaled to the He/H interface during the explosion phase of SN1987A.
Abstract: This paper describes experiments exploring the three-dimensional (3D) Rayleigh–Taylor instability at a blast-wave-driven interface. This experiment is well scaled to the He/H interface during the explosion phase of SN1987A. In the experiments, ∼5 kJ of energy from the Omega laser was used to create a planar blast wave in a plastic disk, which is accelerated into a lower-density foam. These circumstances induce the Richtmyer–Meshkov instability and, after the shock passes the interface, the system quickly becomes dominated by the Rayleigh–Taylor instability. The plastic disk has an intentional pattern machined at the plastic/foam interface. This perturbation is 3D with a basic structure of two orthogonal sine waves with a wavelength of 71 μm and an amplitude of 2.5 μm. Additional long-wavelength modes with a wavelength of either 212 or 424 μm are added onto the single-mode pattern. The addition of the long-wavelength modes was motivated by the results of previous experiments where material penetrated unexpectedly to the shock front, perhaps due to an unintended structure. The current experiments and simulations were performed to explore the effects of this unintended structure; however, we were unable to reproduce the previous results.
47 citations
Patent•
22 Jul 1971
TL;DR: In this paper, a system for controlling a vibration testing environment or apparatus such as a shaker table with a random signal in order to subject a specimen on the table to vibrations having a predetermined power spectral density is disclosed.
Abstract: A system for controlling a vibration testing environment or apparatus such as a shaker table with a random signal in order to subject a specimen on the table to vibrations having a predetermined power spectral density is disclosed. The movement of the specimen is sensed and converted into a digital signal representative of the power spectral density of the movement. This digital signal is compared with the predetermined or desired spectral density and the results of the comparison are utilized with a digitally generated random phase angle to produce a random digital signal. This random digital signal is converted to a time-domain, analog driving signal for driving the apparatus. The same system may be used for high intensity sound testing and sine wave testing.
47 citations