A nonlinear controller for power systems with statcom based on backstepping and rapid-convergent differentiator

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Publication Details

Author list: Kanchanaharuthai A., Mujjalinvimut E.

Publisher: International Astronautical Federation, IAF

Publication year: 2019

Volume number: 15

Issue number: 3

Start page: 1079

End page: 1091

Number of pages: 13

ISSN: 0074-1795

eISSN: 0074-1795

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85079166628&partnerID=40&md5=d6543f5bb342813adeaffc7399bd74a1

Languages: English-Great Britain (EN-GB)

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Abstract

This paper presents a design and performance analysis of the passive microgravity sensor. The passive microgravity sensor is specially designed for non-electric supplied payload, which was launched in Mission 9 of New Shepard, Blue origin. Due to the weightlessness during microgravity, the general mass-spring systems with appropriate mass and spring constant are used to design the sensor and gain the benefit from weightlessness and non-electric. The movable lid of the passive microgravity sensor can be mechanically opened when the sensor is in microgravity condition, after which substances in the experiment chamber in the sensor will be released. All flight scenarios, including microgravity and hyper-gravity conditions, were analyzed to design the mechanism. There are two passive microgravity sensors installed into partition B and partition C of the payload. As a result, the pencil and graph paper recording of each passive microgravity sensors confirms the movement of the movable lid. The movable lid of the passive microgravity sensor in partition C moved upward around 13 millimeters. However, the movable lid of the passive microgravity sensor in partition B moved only five millimeters, which relatively lower than the sensor in partition C. As a consequence of the friction between pencil and paper recorder; it mainly affects the mechanism of the passive microgravity sensor. This caused the passive microgravity sensor in partition B to behave differently compared with a sensor in partition C. These results confirmed the performance of the mechanism of the passive microgravity sensor under the microgravity condition. Copyright ฉ 2019 by the International Astronautical Federation (IAF). All rights reserved.

Keywords

Mass-spring system, Microgravity science, New Shepard, Suborbital experiment