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.

Positioning control device for two-stage actuator

Abstract: In a positioning control device for a two-stage actuator having a coarse-movement actuator and a fine-movement actuator, a notch filter having a cutoff frequency fn is provided to a coarse-movement control loop, and the fine-movement actuator is driven by a sine wave of the frequency fn. At the frequency fn, a head position signal becomes identical with an output signal of the fine-movement actuator, by which the gain of the fine-movement actuator can be estimated by an adaptive identification unit with high accuracy based on the control input to the fine-movement actuator and the head position signal.

Rotation transmitter using rotatable magnet systems with magnetic North and South poles

Abstract: The rotation transmitter has first and second Hall sensors (4,5) arranged such that the rotation of a first magnet system (1) with a single N and S pole causes a cosine wave signal in the first Hall sensor and a sine wave signal in the second Hall sensor. A second rotatable magnet system (2) is provided, which has several alternately arranged N and S poles. It works in conjunction with third and fourth Hall sensors (6,7), which are arranged in such a manner, that by the rotation of the second rotatable magnet system, a cosine signal is produced in the third Hall sensor and a sine signal in the fourth Hall sensor.The cycle of the first cosine and sine signals amounts to a whole number multiplication of the cycle of the second cos. and sin signals. The magnet systems are designed as concentric discs, which mutually spaced are arranged concentrically on a rotatable shaft (3).

Devolution of Inhomogeneities in Bone Structure—Predictions of Adaptive Elasticity Theory

Abstract: In this paper we consider an initially inhomogeneous adaptive elastic body subjected to a steady homogeneous stress state. The adaptive elastic body, which is a model for living bone tissue, is inhomogeneous in both its anisotropic elastic properties and its density. The principal result of the paper is the determination of the devolution of the initially inhomogeneous body to a homogeneous body under the influence of the steady homogeneous stress state. A cylindrical body that is inhomogeneous along the axis of the cylinder, but homogeneous in each transverse plane of the cylinder, is used as an example. This cylindrical body is loaded by a steady uniform stress directed along the cylindrical axis. The temporal devolution of an inhomogeneity in the initial shape of a sine wave is illustrated. As time progresses the amplitude of the sine wave decreases, rapidly at first and then more slowly. As time becomes very large the sine wave becomes a straight line signifying that the cylinder has become homogeneous.

Radar signal design using chaotic signals

Abstract: The use of chaotic signals in radar imaging applications present particular advantages as they behave like pseudo noise, have a wide band, and are easy to generate. A chaotic frequency modulated (FM) sine wave is an example of a chaotic signal that can yield higher transmitted mean power when peak-power limited transmitters are used. Unlike the random FM signal, the behavior of chaotic FM signals is not fully understood. In this paper, two approaches for analyzing the spectrum of chaotic FM signals are discussed. The first approach approximates the chaotic signal with noise and the second one, deals with the condition for the chaotic signal to remain chaotic after frequency modulation and consequently have a wide band spectrum.