scholarly journals Transient Attitude Motion of TNS-0#2 Nanosatellite during Atmosphere Re-Entry

2021 ◽  
Vol 11 (15) ◽  
pp. 6784
Author(s):  
Danil Ivanov ◽  
Dmitry Roldugin ◽  
Stepan Tkachev ◽  
Yaroslav Mashtakov ◽  
Sergey Shestakov ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
Data Transmission ◽  
Geomagnetic Field ◽  
Attitude Motion ◽  
Satellite Motion ◽  
Motion Reconstruction ◽  
Satellite Attitude ◽  
Magnetic Stabilization ◽  
Tumbling Motion ◽  
Magnet Axis

Attitude motion reconstruction of the Technological NanoSatellite TNS-0 #2 during the last month of its mission is presented in the paper. The satellite was designed to test the performance of the data transmission via the Globalstar communication system. This system successfully provided telemetry (even during its atmosphere re-entry) up to an altitude of 156 km. Satellite attitude data for this phase is analyzed in the paper. The nominal satellite attitude represents its passive stabilization along a geomagnetic field induction vector. The satellite was equipped with a permanent magnet and hysteresis dampers. The permanent magnet axis tracked the local geomagnetic field direction with an accuracy of about 15 degrees for almost two years of the mission. Rapid altitude decay during the last month of operation resulted in the transition from the magnetic stabilization to the aerodynamic stabilization of the satellite. The details of the initial tumbling motion after the launch, magnetic stabilization, transition phase prior to the aerodynamic stabilization, and subsequent satellite motion in the aerodynamic stabilization mode are presented.

scholarly journals Influence of the Variable Aerodynamic Moment on Satellite Attitude Motion

2011 ◽  
Vol 11 (3(2)) ◽  
pp. 67-74
Author(s):  
V. S. Aslanov ◽  
◽  
A. V. Pirozhenko ◽  
A. V. Kislov ◽  
A. I. Maslova ◽  
...  
Keyword(s):  
Attitude Motion ◽  
Satellite Attitude ◽  
Aerodynamic Moment

scholarly journals Calculating Extrusion Textures of the Alloy Mn-Al-C

1996 ◽  
Vol 28 (1-2) ◽  
pp. 121-128 ◽  
Author(s):  
V. D. Solovei ◽  
Yu. N. Loginov
Keyword(s):  
Boundary Value Problem ◽  
Permanent Magnet ◽  
Boundary Value ◽  
Easy Magnetization ◽  
Tetragonal Lattice ◽  
Tetragonal Crystal ◽  
Face Centered ◽  
Magnet Axis

The alloy Mn-Al-C (magnetic τ-phase) has a face-centered tetragonal lattice with the superstructure L10 (Shangurov, Gornostyrev, Teitel et al., 1990). The tetragonal crystal axes c (the directions of the easy magnetization) of the grain lattices of the polycrystal permanent magnet must be preferably oriented along the magnet axis. In the present paper the forming of the axial extrusion textures in the alloy Mn-Al-C is investigated theoretically. The texture inhomogeneity is taken into account by solving the boundary value problem of plasticity.

scholarly journals A Novel Interior Permanent Magnet Machine with Magnet Axis Shifted Effect for Electric Vehicle Applications

2021 ◽  
Vol 12 (4) ◽  
pp. 189
Author(s):  
Yongsheng Ge ◽  
Hui Yang ◽  
Weijia Wang ◽  
Heyun Lin ◽  
Ya Li
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Permanent Magnet ◽  
Basic Principle ◽  
Design Parameters ◽  
Asymmetry Ratio ◽  
Interior Permanent Magnet ◽  
Ipm Machine ◽  
Electromagnetic Characteristics ◽  
Magnet Axis

This paper proposes a novel interior permanent magnet (IPM) machine with asymmetrical PM configuration. Different from the traditional IPM counterparts, the proposed machine can perform a magnet axis shifted (MAS) effect. The magnet axis is shifted towards the reluctance axis so that a higher resultant torque capability can be obtained. Firstly, the configuration and the basic principle of the proposed machine are described. The design parameters are optimized to improve the torque capability, and the effect of the PM asymmetry ratio on the torque performance is then evaluated in detail. In addition, the major electromagnetic characteristics of the optimized machine are investigated and compared with those of the Prius 2010 IPM machine by finite element method (FEM). The results demonstrate that the proposed asymmetrical PM configuration can achieve the torque improvement due to the MAS effect.

scholarly journals Averaging technique in the problem of satellite attitude stabilization in indirect position in the orbital reference frame with the use of Lorentz torque

2021 ◽  
Vol 8 (1) ◽  
pp. 123-137
Author(s):  
Aleksandr Yu. Aleksandrov ◽  
◽  
Natalya R. Andriyanova ◽  
Aleksey A. Tikhonov ◽  
◽  
...  
Keyword(s):  
Sufficient Conditions ◽  
Method Of Averaging ◽  
Control Parameters ◽  
Satellite Motion ◽  
Attitude Stabilization ◽  
Satellite Attitude ◽  
Original Construction ◽  
Orbital Coordinate System ◽  
Motion Mode ◽  
Small Inclination

A dynamically symmetric satellite in a circular orbit of small inclination is considered. The problem of the Lorentzian stabilization of the satellite in the orbital coordinate system in the indirect equilibrium position is solved under the conditions of the perturbing effect of the gravitational torque. To solve this problem, which is characterized by incomplete control, a method of averaging differential equations is developed. Using the original construction of the unsteady Lyapunov function, we obtain sufficient conditions for the asymptotic stability of the programmed satellite motion mode in the form of constructive inequalities with respect to the control parameters.

scholarly journals A Novel Magnet-Axis-Shifted Hybrid Permanent Magnet Machine for Electric Vehicle Applications

Energies ◽  
2019 ◽  
Vol 12 (4) ◽  
pp. 641 ◽  
Author(s):  
Ya Li ◽  
Hui Yang ◽  
Heyun Lin ◽  
Shuhua Fang ◽  
Weijia Wang
Keyword(s):  
Permanent Magnet ◽  
High Performance ◽  
Low Cost ◽  
Element Analysis ◽  
Interior Permanent Magnet ◽  
Rotor Pole ◽  
Ipm Machine ◽  
Electromagnetic Characteristics ◽  
The Difference ◽  
Magnet Axis

This paper proposes a novel magnet-axis-shifted hybrid permanent magnet (MAS-HPM) machine, which features an asymmetrical magnet arrangement, i.e., low-cost ferrite and high-performance NdFeB magnets, are placed in the two sides of a “▽”-shaped rotor pole. The proposed magnet-axis-shift (MAS) effect can effectively reduce the difference between the optimum current angles for maximizing permanent magnet (PM) and reluctance torques, and hence the torque capability of the machine can be further improved. The topology and operating principle of the proposed MAS-HPM machine are introduced and are compared with the BMW i3 interior permanent magnet (IPM) machine as a benchmark. The electromagnetic characteristics of the two machines are investigated and compared by finite element analysis (FEA), which confirms the effectiveness of the proposed MAS design concept for torque improvement.

Chaotic attitude motion and its control of spacecraft in elliptic orbit and geomagnetic field

2004 ◽  
Vol 55 (3-9) ◽  
pp. 487-494 ◽  
Author(s):  
Yan-Zhu Liu ◽  
Hong-Jie Yu ◽  
Li-Qun Chen
Keyword(s):  
Geomagnetic Field ◽  
Elliptic Orbit ◽  
Attitude Motion

scholarly journals An implementation of optimal control methods (LQI, LQG, LTR) for geostationary satellite attitude control

2019 ◽  
Vol 9 (6) ◽  
pp. 4728
Author(s):  
Farid Djaballah ◽  
M. A. Si Mohammed ◽  
Nabil Boughanmi
Keyword(s):  
Numerical Simulation ◽  
Dynamic Model ◽  
Attitude Control ◽  
Geostationary Satellite ◽  
Attitude Motion ◽  
Linear Quadratic ◽  
Integer Order ◽  
Satellite Attitude ◽  
Satellite Attitude Control ◽  
Attitude Controller

<p>This paper investigates a new strategy for geostationary satellite attitude control using<strong> </strong>Linear Quadratic Gaussian (LQG), Loop Transfer Recovery (LTR), and Linear Quadratic Integral (LQI) control techniques. The sub-system satellite attitude determination and control of a geostationary satellite in the presence of external disturbances, the dynamic model of sub-satellite motion is firstly established by Euler equations. During the flight mission at 35000 Km attitude, the stability characteristics of attitude motion are analyzed with a large margin error of pointing, then a height performance-order LQI, LQG and LTR attitude controller are proposed to achieve stable control of the sub-satellite attitude, which dynamic model is linearized by using feedback linearization method.<strong> </strong>Finally, validity of the LTR order controller and the advantages over an integer order controller are examined by numerical simulation. Comparing with the corresponding integer order controller (LQI, LQG), numerical simulation results indicate that the proposed sub-satellite attitude controller based on LTR order can not only stabilize the sub-satellite attitude, but also respond faster with smaller overshoot.</p><p> </p>

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