Neutron star dynamics, braking indices and energy dissipation

1998-01-01
Alpar, MA
Models of pulsar glitches and postglich relaxation are reviewed. Implications for braking indices due to internal torques in the neutron star, and energy dissipation by internal torques are discussed. AU recent observations of pulsars with large (Vela pulsar like) glitches and second derivatives are seen to fit with the same glitch dynamics that the Vela pulsar exhibits. (C)1998 COSPAR. Published by Elsevier Science Ltd.

Suggestions

Nonlinear modelling and control of the flow over aerofoils using CFD simulations
Karaca, H. D.; Alıcı, Gökçen Deniz; KASNAKOĞLU, Coşku (2016-09-01)
A simulation based approach for nonlinear dynamical modelling and feedback control of the drag to lift ratio for aerofoils is investigated through case studies involving NACA 23012, ag13 and b737a aerofoils. The flow around the aerofoils is studied via numerical solutions of the 2D Navier-Stokes (NS) equations. A standard computational fluid dynamics (CFD) solver is extended to be able to measure desired feedback values and to apply a control input to the flow field. The proposed modelling and control appro...
POSTGLITCH RELAXATION OF THE VELA PULSAR AFTER ITS 1ST 8 LARGE GLITCHES - A REEVALUATION WITH THE VORTEX CREEP MODEL
ALPAR, MA; CHAU, HF; CHENG, KS; PINES, D (American Astronomical Society, 1993-05-20)
We present a comprehensive reevaluation of eight of the nine glitches observed to date from the Vela pulsar, and the postglitch relaxation following each glitch. All glitch data sets can be described in terms of three distinct components of short and intermediate time scale exponential relaxation, followed by a long-term recovery of the glitch-induced change in the spin-down rate that is linear in t, DELTAOMEGA(c)(t) is-proportional-to t. We interpret the short and the intermediate time scale exponential re...
Active Vibration Control of Smart Plates by Using Piezoelectric Actuators
Yaman, Yavuz; Volkan, Nalbantoğlu; Fatma Demet, Ülker; Eswar, Prasad; Davıd, Waechter; Bın, Yan (null; 2002-06-03)
Theoretical and experimental results of the modeling of a smart plate is presented for active vibration control. The smart plate consists of a rectangular aluminum plate modeled in cantilever configuration with surface bonded piezoelectric patches. The patches are symmetrically bonded on top and bottom surfaces. The study uses ANSYS (v.5.6) software to derive the finite element model of the smart plate. By using this model, the study first gives the influences of the actuator placement and size on the resp...
Nonlinear Transverse Vibrations of a Beam with Multiple Breathing Edge Cracks
Batihan, Ali C.; Ciğeroğlu, Ender (2017-02-02)
One step beyond the studies of transverse vibration of beams with a breathing edge crack is the verification of the theoretical crack beam models with an experimental test set up. Beams with a single breathing edge crack can be used as a specimen for the experimental test. However, there is no assurance against the unexpected additional cracks in the specimens, whichmay cause unexpected results. Therefore, in this paper nonlinear transverse vibration of a beam with multiple breathing edge cracks is consider...
Aerodynamic modelling and optimization of morphing wings
Körpe, Durmuş Sinan; Özgen, Serkan; Department of Aerospace Engineering (2014)
This thesis deals with aerodynamic optimization of morphing wings under performance and geometric constraints. In order to perform the optimization process, flow solvers computing aerodynamic lift and drag were developed as a function evaluator. A gradient based optimization method was used in order to develop the optimization algorithm. Three dimensional panel method solver was developed in order to obtain lift, pressure drag and induced drag values for a finite wing. Obtained results were compared with di...
Citation Formats
M. Alpar, “Neutron star dynamics, braking indices and energy dissipation,” 1998, vol. 21, p. 159, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/63772.