Dr. Amir Sadjadpour Profile

Dr. Amir Sadjadpour

Lead Structural Engineer at Thirty Meter Telescope

SPIE Involvement:

Conference Program Committee | Author

Area of Expertise:

Structural Engineering , Mechanics of Materials , Lean Six Sigma , Applied Mechanics , Construction Management , Project Management

Websites:

Company Website

Proceedings Article | 4 October 2022 Presentation

Seismic Workshop

Bruce Bigelow, Amir Sadjadpour, Frank Kan

Proceedings Volume 12182, 1218219 (2022) https://doi.org/10.1117/12.2631662

KEYWORDS: Observatories, Telescopes, Optical instrument design, Astronomy

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Proceedings Article | 29 August 2022 Presentation + Paper

Seismic isolation system design and performance of TMT telescope structure

Masahiro Sugimoto, Atsushi Kato, Junji Takaki, Masaki Tabata, Tomoya Hattori, Amir Sadjadpour, Brady Espeland, Hugh Thompson, Satoru Sofuku, Yutaka Ezaki, Tomonori Usuda, Hiroshi Kusumoto, Masao Saito, Hiroshi Terada, Seiichi Tazawa, Noboru Kawaguchi, Kyle Kinoshita

Proceedings Volume 12182, 1218216 (2022) https://doi.org/10.1117/12.2631409

KEYWORDS: Telescopes, Earthquakes, Finite element methods, Observatories, Prototyping, Thirty Meter Telescope, Astronomy

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Proceedings Article | 4 August 2014 Paper

TMT telescope structure thermal model

Konstantinos Vogiatzis, Amir Sadjadpour, Scott Roberts

Proceedings Volume 9150, 915011 (2014) https://doi.org/10.1117/12.2056582

KEYWORDS: Telescopes, Systems modeling, Thermal modeling, Solid modeling, Mirrors, 3D modeling, Calibration, Electronics, Solids, Thirty Meter Telescope

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Proceedings Article | 22 July 2014 Paper

Preliminary design study of the TMT Telescope structure system: overview

Tomonori Usuda, Satoru Sofuku, Noboru Itoh, Takeharu Oshima, Takashi Takanezawa, Makoto Endo, Yutaka Ezaki, Junji Inatani, Masanori Iye, Amir Sadjadpour, Noboru Kawaguchi, Kazuhiro Nagae, Atsushi Kato, Junji Takaki, Masaki Hirano, Masaki Tabata, Yasushi Horiuchi, Yusuke Saruta, Tomoya Hattori, Mark Sirota, Scott Roberts, Larry Stepp

Proceedings Volume 9145, 91452F (2014) https://doi.org/10.1117/12.2055767

KEYWORDS: Telescopes, Optical instrument design, Computer aided design, Mirrors, Electroluminescence, Control systems design, Control systems, Earthquakes, Safety, Thirty Meter Telescope

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We present an overview of the preliminary design of the Telescope Structure System (STR) of Thirty Meter Telescope (TMT). NAOJ was given responsibility for the TMT STR in early 2012 and engaged Mitsubishi Electric Corporation (MELCO) to take over the preliminary design work. MELCO performed a comprehensive preliminary design study in 2012 and 2013 and the design successfully passed its Preliminary Design Review (PDR) in November 2013 and April 2014. Design optimizations were pursued to better meet the design requirements and improvements were made in the designs of many of the telescope subsystems as follows: 1. 6-legged Top End configuration to support secondary mirror (M2) in order to reduce deformation of the Top End and to keep the same 4% blockage of the full aperture as the previous STR design. 2. “Double Lower Tube” of the elevation (EL) structure to reduce the required stroke of the primary mirror (M1) actuators to compensate the primary mirror cell (M1 Cell) deformation caused during the EL angle change in accordance with the requirements. 3. M1 Segment Handling System (SHS) to be able to make removing and installing 10 Mirror Segment Assemblies per day safely and with ease over M1 area where access of personnel is extremely difficult. This requires semi-automatic sequence operation and a robotic Segment Lifting Fixture (SLF) designed based on the Compliance Control System, developed for controlling industrial robots, with a mechanism to enable precise control within the six degrees of freedom of position control. 4. CO₂ snow cleaning system to clean M1 every few weeks that is similar to the mechanical system that has been used at Subaru Telescope. 5. Seismic isolation and restraint systems with respect to safety; the maximum acceleration allowed for M1, M2, tertiary mirror (M3), LGSF, and science instruments in 1,000 year return period earthquakes are defined in the requirements. The Seismic requirements apply to any EL angle, regardless of the operational status of Hydro Static Bearing (HSB) system and stow lock pins. In order to find a practical solution, design optimization study for seismic risk mitigation was carried out extensively, including the performing of dynamic response analyses of the STR system under the time dependent acceleration profile of seven major earthquakes. The work is now moving to the final design phase from April 2014 for two years.

Conference Committee Involvement (5)

Ground-based and Airborne Telescopes X

16 June 2024 | Yokohama, Japan

Ground-based and Airborne Telescopes IX

17 July 2022 | Montréal, Québec, Canada

Ground-based and Airborne Telescopes VIII

14 December 2020 | Online Only, California, United States

Ground-based and Airborne Telescopes VIII

13 December 2020 | San Diego, California, United States

Ground-based and Airborne Telescopes VII

10 June 2018 | Austin, Texas, United States

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