Tangential Component

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Yurij N. Krugly - One of the best experts on this subject based on the ideXlab platform.

  • Tangential Component of the yorp effect
    arXiv: Earth and Planetary Astrophysics, 2014
    Co-Authors: Oleksiy Golubov, Yurij N. Krugly
    Abstract:

    This article discusses how re-emission of absorbed solar light by centimeter- to decimeter-sized structures on the surface of an asteroid can create a Component of the recoil force parallel to the surface. Under certain conditions the west side of stones appear to be on average slightly warmer than their east sides, thus experiencing a stronger recoil force and increasing the rotation rate of the asteroid. We study this effect, called the Tangential YORP effect, in a toy model, replacing stones with walls and simulating heat conductivity in them. We discuss general trends of the effect, estimate its magnitude, and find it to be comparable to the normal YORP effect determined by gross-scale asymmetry of the asteroid. The existence of this effect would modify the predictions of the YORP acceleration of asteroids.

  • Tangential Component OF THE YORP EFFECT
    The Astrophysical Journal, 2012
    Co-Authors: Oleksiy Golubov, Yurij N. Krugly
    Abstract:

    This Letter discusses how re-emission of absorbed solar light by centimeter- to decimeter-sized structures on the surface of an asteroid can create a Component of the recoil force that is parallel to the surface. Under certain conditions, the western sides of stones appears to be on average slightly warmer than their eastern sides, thus experiencing stronger recoil force and increasing the rotation rate of the asteroid. We study this effect, called the Tangential YORP effect, in a toy model, replacing stones with walls and simulating heat conductivity in them. We discuss general trends of the effect, estimate its magnitude, and find it to be comparable to the normal YORP effect determined by gross-scale asymmetry of the asteroid. The existence of this effect would modify the predictions of the YORP acceleration of asteroids. In some cases, equilibrium between Tangential and normal Components of YORP is possible, resulting in a large number of asteroids expected to have no net YORP acceleration, which can be the case for Itokawa.

Oleksiy Golubov - One of the best experts on this subject based on the ideXlab platform.

  • Tangential Component of the yorp effect
    arXiv: Earth and Planetary Astrophysics, 2014
    Co-Authors: Oleksiy Golubov, Yurij N. Krugly
    Abstract:

    This article discusses how re-emission of absorbed solar light by centimeter- to decimeter-sized structures on the surface of an asteroid can create a Component of the recoil force parallel to the surface. Under certain conditions the west side of stones appear to be on average slightly warmer than their east sides, thus experiencing a stronger recoil force and increasing the rotation rate of the asteroid. We study this effect, called the Tangential YORP effect, in a toy model, replacing stones with walls and simulating heat conductivity in them. We discuss general trends of the effect, estimate its magnitude, and find it to be comparable to the normal YORP effect determined by gross-scale asymmetry of the asteroid. The existence of this effect would modify the predictions of the YORP acceleration of asteroids.

  • Tangential Component OF THE YORP EFFECT
    The Astrophysical Journal, 2012
    Co-Authors: Oleksiy Golubov, Yurij N. Krugly
    Abstract:

    This Letter discusses how re-emission of absorbed solar light by centimeter- to decimeter-sized structures on the surface of an asteroid can create a Component of the recoil force that is parallel to the surface. Under certain conditions, the western sides of stones appears to be on average slightly warmer than their eastern sides, thus experiencing stronger recoil force and increasing the rotation rate of the asteroid. We study this effect, called the Tangential YORP effect, in a toy model, replacing stones with walls and simulating heat conductivity in them. We discuss general trends of the effect, estimate its magnitude, and find it to be comparable to the normal YORP effect determined by gross-scale asymmetry of the asteroid. The existence of this effect would modify the predictions of the YORP acceleration of asteroids. In some cases, equilibrium between Tangential and normal Components of YORP is possible, resulting in a large number of asteroids expected to have no net YORP acceleration, which can be the case for Itokawa.

John M. Finn - One of the best experts on this subject based on the ideXlab platform.

  • Control of magnetohydrodynamic modes in reversed field pinches with normal and Tangential magnetic field sensing and two resistive walls
    Plasma Physics and Controlled Fusion, 2013
    Co-Authors: K. Sassenberg, A. S. Richardson, Dylan Brennan, John M. Finn
    Abstract:

    Numerical results are presented on control of magnetohydrodynamic (MHD) modes in reversed field pinches (RFPs) for a geometry with two resistive walls. We use measurements of the normal Component of the magnetic field and introduce the use of both Tangential Components. In Richardson et al (2010 Phys. Plasmas 17 112511), RFP control studies were performed sensing the radial (normal) Component of the magnetic field and a single Tangential Component just inside the wall, showing that it is possible to stabilize the MHD modes in an RFP for current up to the ideal plasma–ideal wall limit in that configuration. Here, we extend our modeling by including two resistive walls, in a configuration relevant to experiments such as RFX-mod, and measuring all three magnetic field Components, i.e. including a second Tangential Component, as an exploratory effort. We present our study incrementally, starting with a single resistive wall, and conclude that with the first Tangential sensor located inside the wall, the plasma can be stabilized up to the ideal plasma–ideal wall limit, as in Richardson et al. With the first Tangential sensor outside the wall, stabilization is possible only up to the ideal wall–resistive plasma (tearing) limit. We then show that for experimentally relevant parameters the thin-wall approximation is indeed valid for the MHD modes of interest but invalid for the high-frequency magnetosonic mode (Richardson et al) driven by the (first) Tangential Component feedback. In fact, when a thick-wall formulation with realistic parameters is considered, the high-frequency magnetosonic mode is found to be destabilized only for a very high gain parameter, and we conclude that this mode can be ignored for an experimentally relevant analysis. Consequently, the plasma can be stabilized in a much larger region of feedback gain parameter space than found in Richardson et al. In the presence of two walls, with the first Tangential Component measured just outside the inner wall and with RFX-mod relevant time constants, we show that feedback control can stabilize the plasma at currents much larger than the ideal wall–resistive plasma limit. The current limit is still less, however, than the ideal plasma–ideal wall limit. Use of the second Tangential Component appears in all cases to lead to significantly different but not necessarily improved feedback stabilization. These results may lead to better understanding and improved stability properties in current-day RFP experiments through robust access to quasi-single-helicity states.

B. J. Deken - One of the best experts on this subject based on the ideXlab platform.

  • Investigation of Force Generation in a Permanent Magnet Synchronous Machine
    IEEE Transactions on Energy Conversion, 2007
    Co-Authors: W. Zhu, S. Pekarek, B. Fahimi, B. J. Deken
    Abstract:

    Traditional analysis of permanent magnet synchronous machines has focused upon establishing a relationship between the quadrature and direct axis stator current (or voltage) and the electromagnetic force created to establish rotation (torque). In this paper, an alternative analysis of electromagnetic force production is considered. Specifically, the influences of - and -axis stator current on both the radial and Tangential Components of the airgap flux densities are first evaluated. Using a Maxwell stress tensor approach, the fields are then used to evaluate both the radial and Tangential Component of force density created in the airgap of the machine. From this perspective several interesting observations are made. First, it is shown that the -axis current has zero influence on the average Tangential force (torque), as predicted using traditional analysis, but it has a significant influence on the average radial Component of force. Second, it is shown that the -axis current contributes to both the average radial and average Tangential Components of force. Interestingly, it is also shown that under standard operating conditions, the average radial force far exceeds that of the average Tangential Component of force. Therefore, one can conclude that the magnetic fields established create a significant Component of force in a direction that cannot produce torque.

Alireza Sadeghian - One of the best experts on this subject based on the ideXlab platform.

  • Tangential magnetic field at the surface of pot core transformers
    Journal of Applied Physics, 2008
    Co-Authors: K V Namjoshi, J.d. Lavers, Alireza Sadeghian
    Abstract:

    This paper presents an analytical approach using simplified expressions whereby the Tangential Component of the magnetic field at the surface of pot core transformers can be quickly estimated. Knowledge of the Tangential field can be used to estimate the core loss, which is an important consideration in the design of transformers used at high frequency. Influence of parameters such as winding length is considered. Results both for gapped and ungapped pot cores are in agreement with those obtained using an accurate numerical method.