Constantspeeddrive, a hydro-mechanical component for changing variable engine gearbox speed to constantspeed to drive the electrical power.
恒速驱动装置，将发动机齿轮箱的可变转速转变为恒速以驱动电源的液压机械式部件。
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The ACS 5000 variable speeddrive system enables Boeing to run the fan in adjustable speed mode or at constant speed, depending on the protocols and parameters of each test.
In addition, the company's hydraulic motors will drive 32 special tires that contact the 648-foot diameter wheel, making it rotate at a constantspeed of three times an hour.