Results 31 to 40 of about 2,722 (144)
Aviation, 2021 In this paper, the dynamic stability analysis of a rolling airframe actuated by one pair ON-OFF actuator using linear theory is presented via developing a new closed form solution. The effect of discontinuous forcing term on rolling airframe stability is
Jalal Karimi
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Understanding the effects of the core on the nutation of the Earth
Geodesy and Geodynamics, 2017 In this review paper, we examine the changes in the Earth orientation in space and focus on the nutation (shorter-term periodic variations), which is superimposed on precession (long-term trend on a timescale of years).
Véronique Dehant +7 more
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Research on Variable Baseline Coherent Angle Measurement Based on Nutation Scanning
PhotonicsIn inter-satellite laser communication systems, angular deviations between the boresights of terminals exert an impact on system performance, thereby imposing higher requirements on performance parameters such as the angle measurement accuracy and range ...
Dixiang Zeng +6 more
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Chandler Wobble and Free Core Nutation: Theory and Features
Journal of Astronomy and Space Sciences, 2019 Being a torque free motion of the rotating Earth, Chandler wobble is the major component in the Earth’s polar motion with amplitude about 0.05-0.2 arcsec and period about 430-435 days.
Sungho Na, Kyoung-Min Roh, Jungho Cho
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Jixie chuandong, 2018 The nutation gear drive is a new type of planetary transmission with wide application prospects.In order to improve the serviceability of the nutation reducer,it is necessary to clarify its dynamic characteristics.
Xie Zhiyu +4 more
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Geodesy and Geodynamics, 2020 Until now, the calculation of the principal inertia moment of the triaxial three-layered Earth mainly adopts the scaling method. This method assumes that the corresponding principal inertia axes of the layers coincide each other, but this is not the case.
Wenying Zhang, Wenbin Shen
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Pramana, 1997 The classical non-relativistic problem of the motion of a charged particle in an external central force field and a weak uniform magnetic field is revisited to show that the motion of the kinetic angular momentumL = r × p of the particle, in the so-called Larmor approximation, is not a simple precession but is actually a composite motion involving ...
Rao, K. N. S., Rao, A. V. G.
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ON THE DYNAMICS OF DUAL-SPIN SPACECRAFT CONTAINING A NUTATION DAMPER
Journal of EngineeringThe dynamics of dual-spin spacecraft which containing a proposed nutation damper which consisting of a ring totally filled with a viscous liquid with offset center, to improve damping, is investigated. The equations of motion were developed using Newton-
Ahmed A. Al-Ragihy +2 more
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Jixie chuandong, 1997 This paper analyzes the profile curve of cycloid nutation gear by using the spherical trigonometry theory,derives relative profile equation,and presents the basic parameters and main measurement.All of this are the necessary basis for cycloid nutation ...
何韶君, 赵清
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Nutation damping of dynamically tuned gyroscopes
MATEC Web of Conferences, 2017 The paper deals with the problem of nutation damping of dynamically tuned gyroscopes (DTG). Unlike the common two-axis gyroscopes, the DTG damping torques caused by dry and viscous frictions are absent in gimbal bearings, while those due to the rotor ...
Belyanin Lev, Vu Doan Ket
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