F. Hara, REFINED ACTIVE CONTROL OF SLOSHING BY INTERMITTENT AIR-BUBBLE INJECTION, JSME international journal. Series C, dynamics, control, robotics, design and manufacturing, 37(3), 1994, pp. 595-600
We present in this paper a rule-based control system which effectively
suppresses liquid sloshing by injecting air bubbles into the sloshing
liquid. We show that the most important control parameter is air-bubb
le injection timing, which is determined by the control laws establish
ed from the knowledge on characteristics of slosh suppression by air-b
ubble injection. The control experiments carried out using an 800-mm-l
ong, 500-mm-high, and 150-mm-wide rectangular tank reveal that (1) the
control laws that delay the air bubble injection timing with decrease
in the sloshing amplitude and adjust the zero-level crossing timing o
f sloshing can successfully suppress sloshing oscillation, (2) the eff
ectiveness of the control algorithm is experimentally demonstrated for
earthquake-induced sloshing, and (3) the visualization of slosh circu
lation flow reveals a unique flow pattern when the sloshing is effecti
vely suppressed and can offer an insight towards understanding the mec
hanism of slosh suppression by air-bubble injection.