%0 Conference Paper %B 69th Annual Conference, Virginia Beach, Virginia %D 2010 %T 3507. A Practical Method to Improve Moment of Inertia Measurement Accuracy for Formosat-3 Satellites %A HUNG, HENG-CHUAN %K 06. Inertia Measurements %X The "FORMOSAT-3 Program" is an international collaboration project between Taiwan and the US with joint efforts of Taiwan's National SPace Organization (NSPO) and University Corporation for Atmospheric Research (UCAR) of the US. The primary FORMOSAT-3 mission is to launch a constellation of six micro-satellites into Low-Earth Orbit (LEO) in altitude range 700 ~ 800 Km to collect atmospheric data for weather prediction, atmospheric studies, space weather monitoring and geodetic research. The satellites integration and test were completed at NSPO I&T Facility located in Hsinchu, Taiwan. The objective of this paper is to present the method developed at NSPO to improve Moment Of Inertia (MOI) measurement accuracy for FORMOSAT-3 satellites. The Mass Properties Measurement Facility (MPMF) at NSPO is designed for three axes mass properties measurement of satellite up to 1500 Kg. The MPMF includes a 980 Kg weight L-Fixture for horizontal axes measurement. This “huge” L-Fixture greatly reduces the sensitivity of the MOI measurement for FORMOSAT-3 micro-satellites each weighs only about 62 Kg. Redesign of a smaller L-Fixture is inevitable. However, the L-Fixture is designed so that the test objective is well aligned with the MPMF, to manufacture a new one would be too costly and too time consuming. Decision was made to design a smaller fixture without looking for the alignment problem. The alignment problem is solved later when performing the measurement. The Alignment Measurement Equipment is used to accurately identify the misalignment when the satellite is installed in position for measurement. The misalignment data is then used to correct the MOI data. Although the satellite installed with smaller fixture is not well aligned to the MPMF, the misalignment is well measured. The MOI data can be accurately corrected with the alignment data. The final results show that accuracy has been dramatically improved with this method. %B 69th Annual Conference, Virginia Beach, Virginia %I Society of Allied Weight Engineers, Inc. %C Virginia Beach, Virginia %P 10 %8 05/2010 %U https://www.sawe.org/papers/3507/buy %L 3497 %1 Non-Member Price: $20.00; Member Price: $10.00 Members: First 10 product downloads are Free. %2 10.00 %3 20 %4 SAWE3507