Topic
Rotational speed
About: Rotational speed is a research topic. Over the lifetime, 23327 publications have been published within this topic receiving 151696 citations. The topic is also known as: speed of revolution & revolution rate.
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TL;DR: In this paper, the effect of rotational speed on the quality of integrity of dissimilar Ti-6Al-4V/AA6061 joints is investigated by observing changes in microstructure of the welded specimen.
53 citations
TL;DR: In this paper, the relationship between the equilibrium equation of the gyroscopic torque of a rolling element and the coefficient of friction between the rolling elements and the groove is analyzed for a high-speed angular contact ball bearing.
53 citations
TL;DR: In this paper, an inertial-based rotational vibration energy harvester was designed, characterized, and optimized, which can effectively harvest energy from vibrations at ultra-low frequency (0.02 Hz).
53 citations
TL;DR: In this article, a variable-speed, fixed-pitch wind turbine control strategy was investigated to evaluate the feasibility of constraining rotor speed and power output without the benefit of active aerodynamic control devices.
53 citations
TL;DR: This paper investigates the influence of lateral misalignment, i.e., the distance between the beam axis of a probe light and the rotationaxis of a spinning object, on the rotational Doppler effect and deduces the generalized formula of rotational doppler shift based on a local scattering model.
Abstract: The discovery of the optical rotational Doppler effect associated with orbital angular momentum of light paves a new way to detect the rotational speed of spinning objects. In this paper, we investigate the influence of lateral misalignment, i.e., the distance between the beam axis of a probe light and the rotation axis of a spinning object, on the rotational Doppler effect. First, we analyze the mechanism of the rotational Doppler effect of optical vortices based on the linear Doppler effect. Specifically, we consider the general case where the center of the optical vortex does not coincide with the rotation axis, and deduce the generalized formula of rotational Doppler shift based on a local scattering model. It is found that the bandwidth of the rotational Doppler signal depends proportionally on the amount of lateral misalignment, whereas the value of rotational Doppler shift remains constant. A proof-of-concept experiment is performed, and the measured results agree well with theoretical predictions. These findings may be useful for practical application of the optical rotational Doppler effect in remote sensing and metrology.
53 citations