Dynamic behavior of electrodynamic tether deorbit system on elliptical orbit and its control by Lorentz force

2005 ◽  
Vol 9 (4) ◽  
pp. 366-373 ◽  
Author(s):  
Yoshiki Yamaigiwa ◽  
Eiji Hiragi ◽  
Tomoko Kishimoto
Keyword(s):  
Dynamic Behavior ◽  
Lorentz Force ◽  
Elliptical Orbit ◽  
Electrodynamic Tether

scholarly journals Deployment requirements for deorbiting electrodynamic tether technology

2021 ◽  
Author(s):  
Giulia Sarego ◽  
Lorenzo Olivieri ◽  
Andrea Valmorbida ◽  
Alice Brunello ◽  
Enrico C. Lorenzini ◽  
...  
Keyword(s):  
Lorentz Force ◽  
Electrodynamic Tether ◽  
Operational Life ◽  
Electrodynamic Tethers

AbstractIn the last decades, green deorbiting technologies have begun to be investigated and have raised a great interest in the space community. Among the others, electrodynamic tethers appear to be a promising option. By interacting with the surrounding ionosphere, electrodynamic tethers generate a drag Lorentz force to decrease the orbit altitude of the satellite, causing its re-entry in the atmosphere without using propellant. In this work, the requirements that drive the design of the deployment mechanism proposed for the H2020 Project E.T.PACK—Electrodynamic Tether Technology for Passive Consumable-less Deorbit Kit—are presented and discussed. Additionally, this work presents the synthesis of the reference profiles used by the motor of the deployer to make the tethered system reach the desired final conditions. The result is a strategy for deploying electrodynamic tape-shaped tethers used for deorbiting satellites at the end of their operational life.

Exponentially Convergent Velocity Observer for an Electrodynamic Tether in an Elliptical Orbit

2016 ◽  
Vol 39 (5) ◽  
pp. 1113-1118 ◽  
Author(s):  
Hao Wen ◽  
Zheng H. Zhu ◽  
Dongping Jin ◽  
Haiyan Hu
Keyword(s):  
Elliptical Orbit ◽  
Electrodynamic Tether ◽  
Velocity Observer

Reduction of Libration Angle in Electrodynamic Tether Deployment by Lorentz Force

2017 ◽  
Vol 40 (1) ◽  
pp. 164-169 ◽  
Author(s):  
Jian Zhang ◽  
Zheng H. Zhu ◽  
Zhao Wei Sun
Keyword(s):  
Lorentz Force ◽  
Electrodynamic Tether ◽  
Libration Angle

Ball bearing turbocharger vibration management: application on high speed balancer

2020 ◽  
Vol 21 (6) ◽  
pp. 619
Author(s):  
Kostandin Gjika ◽  
Antoine Costeux ◽  
Gerry LaRue ◽  
John Wilson
Keyword(s):  
Dynamic Behavior ◽  
High Speed ◽  
Internal Combustion Engines ◽  
Ball Bearing ◽  
Squeeze Film ◽  
Design And Technology ◽  
Squeeze Film Damper ◽  
Damping Coefficients ◽  
Bearing Loads ◽  
Stiffness And Damping

Today's modern internal combustion engines are increasingly focused on downsizing, high fuel efficiency and low emissions, which requires appropriate design and technology of turbocharger bearing systems. Automotive turbochargers operate faster and with strong engine excitation; vibration management is becoming a challenge and manufacturers are increasingly focusing on the design of low vibration and high-performance balancing technology. This paper discusses the synchronous vibration management of the ball bearing cartridge turbocharger on high-speed balancer and it is a continuation of papers [1–3]. In a first step, the synchronous rotordynamics behavior is identified. A prediction code is developed to calculate the static and dynamic performance of “ball bearing cartridge-squeeze film damper”. The dynamic behavior of balls is modeled by a spring with stiffness calculated from Tedric Harris formulas and the damping is considered null. The squeeze film damper model is derived from the Osborne Reynolds equation for incompressible and synchronous fluid loading; the stiffness and damping coefficients are calculated assuming that the bearing is infinitely short, and the oil film pressure is modeled as a cavitated π film model. The stiffness and damping coefficients are integrated on a rotordynamics code and the bearing loads are calculated by converging with the bearing eccentricity ratio. In a second step, a finite element structural dynamics model is built for the system “turbocharger housing-high speed balancer fixture” and validated by experimental frequency response functions. In the last step, the rotating dynamic bearing loads on the squeeze film damper are coupled with transfer functions and the vibration on the housings is predicted. The vibration response under single and multi-plane unbalances correlates very well with test data from turbocharger unbalance masters. The prediction model allows a thorough understanding of ball bearing turbocharger vibration on a high speed balancer, thus optimizing the dynamic behavior of the “turbocharger-high speed balancer” structural system for better rotordynamics performance identification and selection of the appropriate balancing process at the development stage of the turbocharger.

Prediction of gear wear for the estimation of solar array drive dynamic behavior

2006 ◽  
Vol 12 (4) ◽  
pp. 33-37
Author(s):  
V.E. Shatikhin ◽  
◽  
L.P. Semenov ◽  
V.S. Khoroshylov ◽  
V.M. Popel' ◽  
...  
Keyword(s):  
Dynamic Behavior ◽  
Solar Array
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