Quality, Centroid And Moment Of Inertia Of Integrated Measurement System Design

The center of mass and moment of inertia directly affect the accuracy of thespacecraft orbit and attitude control, however modern aircraft performance is soadvanced, structure is extremely complex, theoretical calculation is difficult toaccurately get its center of mass and moment of inertia. The main method to get centerof mass and moment of inertia is based on experimental method, which uses theinstruments to the center of mass and moment of inertia of the actual measurement. Thevast majority of cases, the center of mass and moment of inertia measurement istime-sharing with different equipments, this will greatly increase the workload, and islikely to introduce additional measurement error. Aiming at this situation, this paperputs forward a new type of thrust gas bearing and cylinder bearing the integration ofcenter of mass and moment of inertia measurement system to solve this problem.First, this article embarks from the system overall scheme, design of the system ofbasic hardware and software. Hardware mainly includes the mechanical structure of thetest bed sections corresponding to the function, software composition is mainlydiscussed the realization of the software technology and basic functions. System on thebasis of overall scheme, analysis the basic measuring principle, design of test bed fourbasic points, and measurement process based on the basic location of the system.Gas bearing is the key component of this measurement system, so its structure andparameter design is crucial. In this paper, using the membrane gas bearing capacity andstiffness as a design standard, carry on the design. Unlike regular gas bearing, the gasbearing adopts integrated design of this system, namely thrust bearing and cylinderbearing close2in1, it won’t be able to adopt the method of conventional roughestimates on its bearing capacity. Solution is to use the finite element method, the gasfilm block, and then using the river basin, the2d flow into a one-dimensional flow, getthe pressure distribution formula of the bearing is acquired using numerical solution ofthe carrying capacity of the gas film stiffness.In addition to the gas bearing, this article also other structure design and analysis ofthe system, mainly including general structure analysis and supports the design andanalysis of bedplate, roll ring tooling design analysis, lift-support system designanalysis, horizontal torsional pendulum system design, vertical torsional pendulumsystem design analysis and the analysis of the standard sample design.The system error was analyzed mainly including quality measurement error, thecenter of mass measurement error and moment of inertia measurement error.