Athermalization of deformable reflector’s actuators for radio astronomy satellites

Reo Kashiyama, Hiraku Sakamoto, Masaaki Okuma, Hiroaki Tanaka, Kosei Ishimura

Research output: Chapter in Book/Report/Conference proceedingConference contribution


This paper develops an athermalization method to cancel the mismatch of the coefficient of thermal expansion (CTE) that exists in active control mechanisms, through analysis, prototyping, and tests. Essentially, the CTE mismatch between piezoceramics and the other structures made of super invar is cancelled by combing with another metallic part. In addition, this paper clarifies the mechanism of thermal deformation caused by inner structure of a piezoelectric stack actuator. It shows in both finite-element analysis and tests that the CTE mismatch cancellation is affected by the dimension tolerance of the inner structure, but successfully adjustable by the proposed methods. Moreover, the high thermal sensitivity of the actuator is exploited to propose another type of smart actuator, which uses active thermal deformation. This alternative approach is also evaluated through analysis, prototyping, and tests.

Original languageEnglish
Title of host publicationAIAA Spacecraft Structures
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624105302
Publication statusPublished - 2018
Externally publishedYes
EventAIAA Spacecraft Structures Conference, 2018 - Kissimmee, United States
Duration: 2018 Jan 82018 Jan 12

Publication series

NameAIAA Spacecraft Structures Conference, 2018


ConferenceAIAA Spacecraft Structures Conference, 2018
Country/TerritoryUnited States

ASJC Scopus subject areas

  • Aerospace Engineering
  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Computer Science Applications


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