A full-size supercritical helicopter tail rotor drive shaft has been balanced using a quasi-static data acquisition technique. The method employs ultrasonic gaging equipment and a digital computer to determine the amount and location of the balance correction. In one 15-minute pass, the system has demonstrated the ability to locate the center of gravity (CG) of the shaft within 0.001 inch. The balanced shaft has run at speeds up to 10,500 rpm, including sustained operation at four critical speeds, with acceptable vibration at critical speeds. Operation at the design speed (between 2nd and 3rd critical speed) was well within standard high quality balance values.
A Computerized Balancing Technique for Supercritical Helicopter Shafting
1980
55 pages
Report
No indication
English
Aircraft , Drive shafts , Ultrasonic tests , Balance , Gages , Corrections , Computer applications , Tail helicopter rotors , Center of gravity , Data acquisition , Calibration , Mass , Rotation , Test equipment , Vibration , Digital computers , Attack helicopters , Flexible rotors , Supercritical speed , H-64 aircraft , YAH-64 aircraft , HP-1000 computers , Center of rotation , LTN001
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