A novel reaction wheel unloading method with stability analysis for solar sails utilizing liquid crystal devices

Ji, Haoran; Li, Dongxu

doi:10.1016/j.ast.2021.107188

Cited by 6 publications

(4 citation statements)

References 26 publications

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“…Andrea and James [10] developed a control scheme for momentum management of conventional satellites by using RCD, and the feasibility of this technology was proved through numerical simulations in Earth and lunar orbits. Ji et al [11] investigated the unloading problem and proposed an unloading method based on the angular deviation to determine the RCD state. The control strategies proposed above all require a sorting and selection process to decide the RCD states, which relies on adequate memory size and computing resources.…”

Section: Introductionmentioning

confidence: 99%

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A novel unloading strategy for solar sails using reflectivity control device

Qi,

Fan,

2024

J. Phys.: Conf. Ser.

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For near-Earth spacecraft, many environmental forces are utilized to unload reaction wheels. However, effects like magnetic force or atmospheric friction hardly exist in deep-space environments where solar sails operate. Thus, this paper proposes an unloading method that uses reflectivity control devices to generate Solar Radiation Pressure (SRP) torque to conduct the unloading process of solar sails operating in deep space. Firstly, the basic principles of the Reflectivity Control Device (RCD), satellite kinetic model, and Pulse Width Pulse Frequency (PWPF) modulator are given. Secondly, based on the torque envelope obtained by traversing all switch combinations of RCD, a novel strategy using a PWPF modulator is specially designed to achieve efficient unloading. In the end, we carry out numerical simulations and analyze the influence of different parameters, through which the validity of the proposed torque resolution scheme is demonstrated.

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Section: Introductionmentioning

confidence: 99%

“…To achieve rapid attitude stabilization and disturbance elimination, the momentum wheel's output torque utilizes a tracking control rate [11] designed through the Lyapunov method, i.e.…”

mentioning

confidence: 99%

A novel unloading strategy for solar sails using reflectivity control device

Qi,

Fan,

2024

J. Phys.: Conf. Ser.

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“…The conical maneuvers of the satellite with respect to the sun, when the sun sensor normal vector is placed in the cone center, cause the sunlight to completely cover the sensor FOV. Although the control problem presented in the literature covers a variety of the aims, such as de-tumbling (Invernizzi and Lovera, 2020), nadir pointing (Yang, 2010), sun pointing (Wu et al, 2016), and also reaction wheel unloading (Ji and Li, 2021), the control law for the conical maneuver is not introduced and just some similar satellite maneuvers are given in Wu et al (2016), You et al (2006), Song et al (2014), and Li et al (2019). In this paper, we design a control law for conical maneuvers of the satellite whose results lead to cover a ring in the sensor FOV.…”

Section: Introductionmentioning

confidence: 99%

In-orbit calibration of the pyramid coarse sun sensor using Lyapunov-based conical maneuvers of the satellite: A new framework

Mafi

Saki

Bolandi

2023

Transactions of the Institute of Measurement and Control

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Due to the lightweight, inexpensive, and simplicity, coarse sun sensors (CSS) are an interesting part of the small satellites with low-earth orbit. However, the CSS drawbacks such as low accuracy and nonlinear distribution of the error contours through the sensor Field of View (FOV) apply a notable limitation in its application. This forces the literature to focus on laboratory or in-orbit calibration methods. The excellence of the in-orbit calibration in comparison with the laboratory cases is clear; however, the difficulty is to achieve enough data when the satellite is launched. To solve that, in this paper, a conical maneuver based on the Lyapunov theory is designed which causes the sunlight to cover the sensor FOV. After that, using the achieved rich data pack, the CSS calibration process, including the sensor misalignment, solar cells misalignment, and solar cells characteristic curve (Fresnel effect), is accomplished. Moreover, the results show that the combination of the new calibration methods with the iterative least square (ILS) algorithm leads to 0.89° accuracy through the FOV of 120°.

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“…The last few decades have seen an enormous growth in the development of novel devices based on optics and photonics technologies 1 – 4 . Therefore, materials and designs are constantly required in emerging modern technologies to build compact, weightless, highly adaptable, and effective optical devices 5 – 7 . Liquid crystals (LCs) are one of the most well-known materials in this field 8 .…”

Section: Introductionmentioning

confidence: 99%

Temperature-dependent optical properties of some mixtures nematic liquid crystal

Alipanah

Zakerhamidi

Ranjkesh

2022

Sci Rep

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The presence of optical anisotropy in liquid crystals (LCs) has caused these materials to have dual refractive indices: ordinary (no) and extra-ordinary (ne). Many fundamental information about LCs can be found by looking at these refractive indices. In this work, the refractive indices of four mixtures nematic liquid crystal (NLC) have been studied as a function of temperature, and the relevant functions were then calculated. Subsequently, the order parameter of mentioned LCs was determined using three methods: Vuks, Haller, and the effective geometry parameter method. It was concluded that the obtained values are not significantly different and exhibit the same temperature dependence. The obtained results were evaluated in relation to the approach utilized.

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A novel reaction wheel unloading method with stability analysis for solar sails utilizing liquid crystal devices

Cited by 6 publications

References 26 publications

A novel unloading strategy for solar sails using reflectivity control device

A novel unloading strategy for solar sails using reflectivity control device

In-orbit calibration of the pyramid coarse sun sensor using Lyapunov-based conical maneuvers of the satellite: A new framework

Temperature-dependent optical properties of some mixtures nematic liquid crystal

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