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: The results revealed that the temperature rise and the duration of temperature elevation decreased with speed and force, suggesting that drilling at high speed and with large load is much more desirable than previously thought.
124 citations
TL;DR: In this paper, the in-plane and out-of-plane free vibrations of a rotating Timoshenko beam are analyzed by means of a finite element technique, where the beam is discretized into a number of simple elements with four degrees of freedom each.
123 citations
Patent•
03 Aug 2000TL;DR: In this article, the authors propose to prevent the engagement of an engaging part (clutch) under appropriate conditions, which can effectively avoid the so-called surging phenomenon, by detecting the rotational speed of the engaging element positioned at the output shaft side of the drive/regeneration motor.
Abstract: By preventing engagement of an engaging part (clutch) under appropriate conditions, it is possible to effectively avoid the so-called surging phenomenon. When there is an engaging directive for the clutch, the rotational speed of the engaging element positioned at the output shaft side of the drive/regeneration motor (the clutch output rotational speed) is detected, and the gear ratio of the CVT is detected, and when the product of the rotational speed of the engaging element and the gear ratio of the CVT is equal to or below a predetermined value, complete engagement between the engaging elements is prevented, and control is conducted which makes the gear ratio large.
120 citations
TL;DR: In this paper, the authors describe models for the transient analysis of heavy duty gas turbines, and present dynamic simulation results of a modern gas turbine for electric power generation, including the effect of movable vanes, which govern the operating behavior of a whole engine.
Abstract: This paper describes models for the transient analysis of heavy duty gas turbines, and presents dynamic simulation results of a modern gas turbine for electric power generation. Basic governing equations have been derived from integral forms of unsteady conservation equations. Mathematical models of each component are described with the aid of unsteady one-dimensional governing equations and steady-state component characteristics. Special efforts have been made to predict compressor characteristics including the effect of movable vanes, which govern the operating behavior of a whole engine. The derived equation sets are solved numerically by a fully implicit method. A controller model that maintains constant rotational speed and target temperature (turbine inlet or exhaust temperature) is used to simulate practical operations. Component models, especially those of the compressor, are validated through comparison with test data, The dynamic behavior of a 150 MW class engine is simulated. The time-dependent variations of engine parameters such as power, rotational speed, fuel, temperature, and guide vane angles are compared with field data. Simulated results are fairly close to the operation data.
120 citations
TL;DR: In this paper, mixed convection of nanofluids in a three dimensional cavity with two inner adiabatic rotating circular cylinders were analyzed by using finite element method, and a correlation for the average Nusselt number in polynomial form was developed which is a function of Rayleigh number and angular rotational speed of the cylinders.
120 citations