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http://dx.doi.org/10.20910/JASE.2018.12.2.46

Characteristics Analysis of a Pseudoelastic SMA Mesh Washer Gear for Jitter Attenuation of Stepper-actuated Gimbal-type Antennas  

Park, Yeon-Hyeok (Department of Aerospace Engineering, Chosun University)
You, Chang-Mok (Kukdong Telecommunication)
Oh, Hyun-Ung (Department of Aerospace Engineering, Chosun University)
Publication Information
Journal of Aerospace System Engineering / v.12, no.2, 2018 , pp. 46-58 More about this Journal
Abstract
A two-axis gimbal-type X-band antenna is widely used to transmit bulk image data from high-resolution observation satellites. However, undesirable microvibrations induced by driving the antenna should be attenuated, because they are a main cause of image-quality degradation of the observation satellite. In this study, a pseudoelastic memory alloy (SMA) gear was proposed to attenuate the microvibrations by driving the antenna in an azimuth angle. In addition, the proposed gear can overcome the limitations of the conventional titanium blade gear, which is not still enough and is vulnerable to plastic deformations under excessive torque. To investigate the basic characteristics of the proposed SMA mesh washer gear, a static load test was performed on the thickness of the SMA mesh washer and the rotation of the gear. Moreover, The microvibration measurement test demonstrated that the SMA mesh washer gear proposed in this study is effective for microvibration attenuation.
Keywords
Two-axis Gimbal-type X-band Antenna; Shape Memory Alloy; Pseudoelasticity; Micro-vibration;
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