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whirlabout n.旋轉,盤旋。

whirligig

Whirlabout flat drive system adopts direct current electromotor and servo system is closed loop . the system carries out the response of adjusting shipboard 90 ? within 1 . 8 seconds and orientates accurate position simultaneously ( the error is within ? ? ) 同時為實現1 . 8秒調舷90的響應,并調舷定位在精確方位上(誤差在20之內) ,伺服系統以線性? ?非線性系統來實現。