A New Mass Properties Measurement System for the Assembly of Rocket Cabins

In order to meet the mass and center of mass measurement requirement in the assembly process of rocket cabins, a new method is proposed based on the moment balance principle and alternative mechanism. While the reference of force transducers cannot be measured directly on the assembly platform, the principle of calculating the attitude by laser tracker is presented, and an alternative measurement mechanism of mass center is designed to realize the combination of assembly and measurement. The actual maximum error of the equipment is less than 0.1%, which is validated by an experiment of measuring a standard sample. At last, the sources of measurement error are analyzed to improve the accuracy. The results show that this measurement system can measure the mass and center of mass in the process of assembly, and fulfill the accuracy requirement of rocket cabins.