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, a force balance that includes the effects of inertia and surface tension is derived for the filament stretching device, which is used increasingly as an apparatus for measuring extensional properties of polymeric liquids.
Abstract: The filament stretching device which is used increasingly as an apparatus for measuring extensional properties of polymeric liquids is analysed. A force balance that includes the effects of inertia and surface tension is derived. The force balance may be used to correct for the effects of inertia and surface tension, provided online measurements of the filament surface shape are available. In addition, the question of initial asymmetry due to gravity is addressed.
74 citations
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TL;DR: In this article, a novel on-line inertia identification method with a load torque observer is presented to optimize the speed loop PID parameters of a servo system. But, the method of speed loop PI parameters optimization with the identified inertia and load torque is deduced in frequency domain.
Abstract: This paper presents a novel on-line inertia identification method with a load torque observer to optimize the speed loop PID parameters of a servo system. The proposed inertia identification algorithm in this paper adopts the fixed-order recursive empirical frequency-domain optimal parameter estimation to improve the speed loop performance. A load torque observer is employed in order to obtain a more precise value of inertia. Then, the method of speed loop PI parameters optimization with the identified inertia and load torque is deduced in frequency domain. Compared with the recursive least square algorithm, the effectiveness of the proposed method is demonstrated by the simulation and experimental results.
74 citations
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TL;DR: In this article, the authors introduce a model to capture the behavioral phenomenon of inertia in inter-temporal consumer purchase decisions, which is represented by a utility premium that is required to trigger purchases.
Abstract: This paper introduces a model to capture the behavioral phenomenon of inertia in inter-temporal consumer purchase decisions. We define inertia as the inherent tendency to refrain from making any purchase. This is represented by a utility premium that is required to trigger purchases. Inertia may induce consumers to wait even when it is optimal to buy immediately. We show that our model of inertia is consistent with well-established behavioral regularities, such as loss aversion and probability weighting in the sense of prospect theory, and hyperbolic time preferences. We embed this decision model within a dynamic pricing context. The firm has a fixed capacity of a particular product and sells it over two time periods to a market consisting of both rational and inertial consumers. We find that the depth of inertia (i.e., strength of inertial effects) always hurts seller profits but the breadth of inertia (i.e., the proportion of inertial consumers) may sometimes be beneficial. We offer practical recommendations for firms to influence both depth and breadth of consumer inertia.
74 citations
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TL;DR: This work proposes an equilibrium condition and defines a class of external force, which includes the transverse Lorentz force, leading to equilibrium, and develops a mesoscopic theory consistent with the second law.
Abstract: We investigate the nonequilibrium steady-state thermodynamics of single Brownian macromolecules with inertia under feedback control in an isothermal ambient fluid. With the control being represented by a velocity-dependent external force, we find such an open system can have a negative entropy production rate, and we develop a mesoscopic theory consistent with the second law. We propose an equilibrium condition and define a class of external force, which includes the transverse Lorentz force, leading to equilibrium.
74 citations
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01 May 2006TL;DR: In this paper, an estimation algorithm for identifying the moment of inertia, which is essential for the design of a high performance controller for a motor drive system, is presented, by observing the position error signal generated by the speed observer.
Abstract: An estimation algorithm for identifying the moment of inertia, which is essential for the design of a high performance controller for a motor drive system, is presented. The proposed algorithm finds the moment of inertia by observing the position error signal generated by the speed observer, which contains error information on the moment of inertia. The proposed algorithm is easy to realise in an observer-based speed detection method. Simulation and experimental results are presented to confirm the performance of the moment of inertia estimation method, and show that the moment of inertia converges to an actual value within several speed changes. As a result, the speed control responses and designed speed controller performance match well.
73 citations