6-Ton Mass Properties Measuring Facility

The mass properties measuring facility is composed of a “mass measuring system” and a “mass properties measuring system”, which respectively measure the mass, and the CG and MOI, of a spacecraft.
The former system measures the mass of a test item by hanging it with a crane through a load cell. The mass of a test item weighing 150 kg or less can be measured with a large-scale precision mass measuring table which belongs to the facility.
The latter system, meanwhile, measures the CG and MOI of a test item by rotating it on the rotary table supported by air bearings, simultaneously applying free vibration around its vertical axis.

System Architecture

6-Ton Mass Properties Measuring Facility System Architecture

Specification

mass measuring system
(load cell)		 measurement range 100~6,500 kg
measurement accuracy 0.1% or less
auxiliary equipment
(large-scale precision weight)		 measurement range 1 g 〜150 kg
measurement accuracy ±4 g
mass properties measuring system load capacity 60~6,000 kg
diameter of rotary table 2,000 mmφ
accuracy of MOI measurement 50 kg-m2 or more:±0.5%

Actual Applications

SELENE, GCOM-W, GOSAT, GPM-DPR, ASTRO-H, etc.