Design and verification of a negative resistance electromagnetic shunt damper for spacecraft micro-vibration

Stabile, Alessandro; Aglietti, Guglielmo S.; Richardson, Guy; Smet, Geert

doi:10.1016/j.jsv.2016.09.024

Cited by 76 publications

(60 citation statements)

References 30 publications

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“…Spacecraft rotational devices, such as gyros which are used for attitude measurement and control, generate high-frequency vibration that may cause acceleration with amplitudes up to 10 −3 g [2], thereby aggravating a high-level microgravity environment. A microgravity environment can be created by several ground-based facilities, such as the well-known free-fall tower, which may provide 4-6 s of microgravity [3].…”

Section: Liuwei@csuaccnmentioning

confidence: 99%

Control performance simulation and tests for Microgravity Active vibration Isolation System onboard the Tianzhou-1 cargo spacecraft

Liu

Zhang

et al. 2018

Astrodyn

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The Microgravity Active vibration Isolation System (MAIS), which was onboard China's first cargo-spacecraft Tianzhou-1 launched on April 20, 2017, aims to provide high-level microgravity at an order of 10 −5 -10 −6 g for specific scientific experiments. MAIS is mainly composed of a stator and a floater, and payloads are mounted on the floater. Sensing relative motion with respect to the stator fixed on the spacecraft, the floater is isolated from vibration on the stator via control forces and torques generated by electromagnetic actuators. This isolation results in a high-level microgravity environment. Before MAIS was launched into space, its control performance had been simulated on computers and tested by air-bearing platform levitation and aircraft parabolic flight. This article first presents an overview of the MAIS's hardware system, particularly system structure, measurement sensors, and control actuators. Its system dynamics, state estimation, and control laws are then discussed, followed by the results of computer simulation and engineering tests, including the test of the six-degree-of-freedom motion by aircraft parabolic flight. Simulation and test results verify the accuracy of the control strategy design, effectiveness of the control algorithms, and performance of the entire control system, paving the way for operation of MAIS in space.This article also presents the steps recommended for the control performance simulation and tests of MAIS-like devices. These devices are expected to be used on China's Space Station for various scientific experiments that require a high-level microgravity environment. KEYWORDS

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Section: Liuwei@csuaccnmentioning

confidence: 99%

Control performance simulation and tests for Microgravity Active vibration Isolation System onboard the Tianzhou-1 cargo spacecraft

Liu

Zhang

et al. 2018

Astrodyn

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“…It is noted that real micro-vibration sources produce disturbances in all six degrees of freedom whereas the proposed isolator counteracts a disturbance only along a single degree of freedom (since the strut's two degrees of freedom are collinear). However, the evaluation of the damper performance of a single strut allows it to be compared with other damping solutions [1,31]. EMSDs provide a damping force due to the combination of two different physics phenomena that are described by the Faraday-Lenz law and the Lorentz force law (see [31] for more details).…”

Section: Analytical Modelmentioning

confidence: 99%

“…However, the evaluation of the damper performance of a single strut allows it to be compared with other damping solutions [1,31]. EMSDs provide a damping force due to the combination of two different physics phenomena that are described by the Faraday-Lenz law and the Lorentz force law (see [31] for more details). Through the assumptions of constant magnetic field seen by the conductive material (due to the relative displacement being in the order of magnitude of tenths of a millimetre for a micro-vibration load case), linear trend of the magnetic field along the radial axis inside the small cross section of the electromagnet, and relative motion between the conductor and the magnet to be only along the z-axis, the Faraday-Lenz law and the Lorentz force law can be respectively simplified as:…”

Section: Analytical Modelmentioning

confidence: 99%

A 2-collinear-DoF strut with embedded negative-resistance electromagnetic shunt dampers for spacecraft micro-vibration

Stabile

Aglietti

Richardson

et al. 2017

Smart Mater. Struct.

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Micro-vibration on board a spacecraft is an important issue that affects payloads requiring high pointing accuracy. Although isolators have been extensively studied and implemented to tackle this issue, their application is far from being ideal due to the several drawbacks that they present, such as limited low-frequency attenuation for passive systems or high power consumption and reliability issues for active systems. In the present study, a novel 2-collinear-DoF strut with embedded Electromagnetic Shunt Dampers (EMSD) is modelled, analysed and the concept is physically tested. The combination of high-inductance components and negative-resistance circuits is used in the two shunt circuits to improve the EMSD micro-vibration mitigation and to achieve an overall strut damping performance that is characterised by the elimination of the resonance peaks and a remarkable FRF final decay rate of −80 dB/dec. The EMSD operates without requiring any control algorithm and can be comfortably integrated on a satellite due to the low power required, the simplified electronics and the small mass. This work demonstrates, both analytically and experimentally, that the proposed 2-collinear-DoF strut with embedded EMSD 2 strut is capable of producing better isolation performance than other well-established damping solutions over the whole temperature range of interest.

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“…Diagram of the feedback loop is shown in Figure 3. A mass m whose motion x we wish to decouple from any motion of the ground y is suspended from a spring with linear spring constant k and damping factor c (Figure 1). By analyzing the system we get a well known linear 2nd order dynamic equat ion with constant coefficients [19][20][21] …”

Section: Fig3 -Diagram Of the Feedback Loopmentioning

confidence: 99%

Design of an Active Low Frequency Vibration Isolation System for Atom Interferometry by Using Sliding Mode Control

Luo¹,

Cheng²,

Wu³

et al. 2017

CEJ

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Active vibration isolation is gaining increased attention in the ultra-high precision application of atom interferometry to effectively treat the unavoidable ground vibration. In this system, a digital control subsystem is used to process and feedback the vibration measured by a seismometer. A voice coil actuator is used to control and cancel the motion of a commercial passive vibration isolation platform. The system level simulation model is established by Simulink software, The simulation results demonstrate the asymptotic stability of the system and the robustness of the control algorithm. Compared with the conventional lead-lag compensation type controller, the algorithm adopted uses sliding mode control, taking advantage of its easy computer implementation and its robust high performance properties. With the feedback path closed, the system acts like a spring system with a natural resonance frequency of 0.02 Hz. The vibration noise in the vertical direction is about 20 times reduced during 0.1 and 2 Hz, The experimental results verify that the isolator has significant vibration isolation performance, and it is very suitable for applications in high precision gravity measurement.

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Design and verification of a negative resistance electromagnetic shunt damper for spacecraft micro-vibration

Cited by 76 publications

References 30 publications

Control performance simulation and tests for Microgravity Active vibration Isolation System onboard the Tianzhou-1 cargo spacecraft

Control performance simulation and tests for Microgravity Active vibration Isolation System onboard the Tianzhou-1 cargo spacecraft

A 2-collinear-DoF strut with embedded negative-resistance electromagnetic shunt dampers for spacecraft micro-vibration

Design of an Active Low Frequency Vibration Isolation System for Atom Interferometry by Using Sliding Mode Control

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