AN EQUIVALENT MECHANICAL MODEL FOR LIQUID SLOSHING ON SPACECRAFT

摘要

In order to improve the accuracy of the attitude control problemrnencountered by spacecraft with liquid containers, a study on dynamicrnmodeling of liquids in moving containers is conducted. As a result, a newrnequivalent mechanical model which can describe the relative rollingrnmovement of the liquid to the containers is proposed, using the method ofrnFinite-element along with Fluid mechanics. The new equivalent mechanicalrnmodel has one more degree of freedom and better identification of thernviscous resistance compared with the old ones. Therefore, the dynamicrninfluences on the spacecraft caused by the sloshing of the liquid during thernattitude maneuvering procedure can be calculated more accurately by usingrnthe new model and so is the changing of dynamic factors, as well as therndynamic influence caused by the viscous resistance between the liquid andrnthe container. The research results can provide theoretical basis for attituderncontrol problem of spacecraft with liquid containers and thus achieve thernpurpose of improving control accuracy. The simulation results demonstraternthat the FCFS model fits the previous simulation work and experimentalrndata well, and thus is applicable.