Reflector Surface Precision Measurement and Adjustment of Cable-Truss Combined Structures

2020 ◽  
pp. 165-175
Author(s):  
Baoyan Duan ◽  
Yiqun Zhang ◽  
Jingli Du
Keyword(s):  
Precision Measurement ◽  
Reflector Surface ◽  
Surface Precision

Preliminary Research on Connecting Strategy between Back-Up Structure and Alidade for 110-m QitTai Radio Telescope

2015 ◽  
Vol 741 ◽  
pp. 61-65
Author(s):  
Qian Xu ◽  
Lin Li ◽  
An Yu Cheng
Keyword(s):  
Radio Telescope ◽  
Surface Deformation ◽  
Cone Angle ◽  
Antenna Structure ◽  
Space Truss ◽  
Reflector Surface ◽  
Main Reflector ◽  
Space Truss Structure ◽  
Surface Precision ◽  
Better Than

The QTT (QiTai 110m radio telescope) antenna, with large aperture and high main-reflector surface precision, whose connecting strategy between back-up structure and alidade was investigated. In order to make the reflector surface deformation coordinated, the connecting strategies of “umbrella supporting”, “space truss” and “double gear” structure were constructed and analyzed based on FEM (finite element method). The results show that “double gear supporting” is superior to “space truss structure”, and the latter is better than “umbrella supporting”, while in the “umbrella supporting structure”, the smaller cone angle is good for reflector deformation coordination. These structures are easy to achieve antenna structure “homology” design.

High precision measurement of the SOS surface thickness in the rough phase

1991 ◽  
Vol 1 (12) ◽  
pp. 1669-1673 ◽  
Author(s):  
Hans Gerd Evertz ◽  
Martin Hasenbusch ◽  
Mihail Marcu ◽  
Klaus Pinn ◽  
Sorin Solomon
Keyword(s):  
High Precision ◽  
Precision Measurement ◽  
High Precision Measurement ◽  
Surface Thickness

INDALLOY 160-190

Alloy Digest ◽  
1984 ◽  
Vol 33 (1) ◽  
Keyword(s):  
Physical Properties ◽  
Tensile Properties ◽  
Precision Measurement ◽  
Heat Treating ◽  
Spray Forming ◽  
Growth Behavior ◽  
Temperature Range

Abstract INDALLOY 160-190 is a bismth-base low-melting alloy that melts through th temperature range 160-190 F. It shrinks immediately upon solidification, grows back to zero in about one hour and then shows additional growth. This shrinkage-growth behavior makes it an ideal alloy for proof casting and precision measurement of internal dimensions. This alloy originally was developed for use by children for casting soldiers and other small objects. It performs best among the low-melting alloys for spraying in the spray forming of masks and molds and in metallizing. This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on casting, heat treating, machining, and joining. Filing Code: Bi-34. Producer or source: Indium Corporation of America.

Ultrahigh-precision measurement timing jitter based on self-reference source

2020 ◽  
Vol 28 (11) ◽  
pp. 2429-2436
Author(s):  
Peng XU ◽  
◽  
Yuan-shan LIU ◽  
Jian-guo ZHANG ◽  
◽  
...  
Keyword(s):  
Precision Measurement ◽  
Timing Jitter ◽  
Reference Source ◽  
Self Reference

Precision Measurement of Supersonic Rocket Sled Velocity-Part II

1958 ◽  
Vol 28 (12) ◽  
pp. 809-816
Author(s):  
F. J. BEUTLER ◽  
L. L. RAUCH
Keyword(s):  
Precision Measurement
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