Topic
Inertia
About: Inertia is a research topic. Over the lifetime, 12006 publications have been published within this topic receiving 164291 citations.
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TL;DR: In this paper, the dynamic behavior of a multi-span continuous beam traversed by a moving mass at a constant velocity is investigated, in which it is assumed that each span of the continuous beam obeys uniform Euler-Bernoulli beam theory.
143 citations
TL;DR: The origin of inertia has intrigued scientists and philosophers for centuries, and Einstein's general theory of relativity predicts that a spinning mass will ‘drag’ inertial frames along with it, which is reviewed here.
Abstract: The origin of inertia has intrigued scientists and philosophers for centuries. Inertial frames of reference permeate our daily life. The inertial and centrifugal forces, such as the pull and push that we feel when our vehicle accelerates, brakes and turns, arise because of changes in velocity relative to uniformly moving inertial frames. A classical interpretation ascribed these forces to acceleration relative to some absolute frame independent of the cosmological matter, whereas an opposite view related them to acceleration relative to all the masses and 'fixed stars' in the Universe. An echo and partial realization of the latter idea can be found in Einstein's general theory of relativity, which predicts that a spinning mass will 'drag' inertial frames along with it. Here I review the recent measurements of frame dragging using satellites orbiting Earth.
143 citations
TL;DR: In this article, the authors used the limit equilibrium technique of slope stability analysis with inclined slices to determine the bearing capacity of shallow strip footings under earthquake loading conditions, where the effect of the inertia of the soil mass underneath a footing was considered to be acting on the structure.
Abstract: In determining the bearing capacity of shallow strip footings under earthquake loading conditions, most seismic codes neglect the effect of the inertia of the soil mass underneath a footing. Seismic acceleration is considered to be acting on the structure only. In this Paper, the seismic bearing capacity factors (i.e. Nq, Nc and Nr), are determined by using the limit equilibrium technique of slope stability analysis with inclined slices. The analysis shows that the factor. Vq is dependent on the inertia of the surcharge load; the relationship between Nc and Vq given in the literature is found to be incorrect for inclined loads and the inertia of the soil mass certainly has an effect on Vy. Results of the analysis are shown in graphical forms as functions of the horizontal acceleration factor and of the angle of internal friction of the soil. The analysis does not include the effect of the excess pore water pressure generated by the earthquake. For small accelerations, smaller than 0·lg the effect of the i...
142 citations
TL;DR: In this paper, an online algorithm for estimating the time of disturbance and inertia after a disturbance is proposed, which is in contrast to previous inertia estimation methods that operated offline and could provide support for adaptive frequency control.
Abstract: Offnominal power system frequency regimes play a key role in the propagation of disturbed system conditions and blackouts. The evolution of power systems will make the availability of frequency-control services more uncertain, increasing the risk of large frequency deviations. Furthermore, the reduction in the inherent inertia of power systems and their increased variability will be a critical threat to the quality of frequency control. This paper proposes an online algorithm for estimating the time of disturbance and inertia after a disturbance. This is in contrast to previous inertia estimation methods that operated offline. The algorithm processes wide-area measurements of frequency and active power and could provide support for adaptive frequency control. Simulations, laboratory tests, and real transmission system measurements have been used to demonstrate the algorithm's ability to correctly detect a disturbance, accurately estimate the time of the disturbance and the inertia, and prevent false disturbance detections.
142 citations
TL;DR: A detailed analysis of the flow of a Newtonian fluid in the annular region between two infinitely long circular cylinders with parallel axes, resulting from the uniform rotation of one, or both, of the cylinders about their axes, is carried out in this paper.
Abstract: A detailed analysis is carried out of the flow of a Newtonian fluid in the annular region between two infinitely long circular cylinders with parallel axes, resulting from the uniform rotation of one, or both, of the cylinders about their axes. No restriction is placed on the geometry of the system and results are obtained both with the neglect of inertial effects and for the linearized inertial approximation. In both cases, the resultant of the forces exerted by the fluid on the cylinders and the distribution of their normal and tangential components over the cylinders are calculated, and the stream-line patterns are analyzed in some detail. A number of conditions, under which stagnation points, separation points and eddies can exist, are established.
142 citations