| ZHU Wenjuan,YAO Wenrong.Investigation on Test of Helicopter Torsional Vibration Natural Frequency Measurement[J].航空发动机,2018,44(3):71-75 |
| Investigation on Test of Helicopter Torsional Vibration Natural Frequency Measurement |
| DOI： |
| Key Words:natural frequency torsional vibration measure closed system sweep-frequency excitation helicopter |
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| Abstract:The coupling between helicopter torsional vibration and FADEC control has a horribly destructive effect. Effective measures
must be taken to prevent this torsional vibration in FADEC. Therefore,it is necessary to measure the natural frequency of torsional vibration
by test. A new scheme for natural frequency measurement of helicopter torsional vibration is originally proposed and designed,which
excited the given value of power turbine speed in FADEC system by utilizing sweep-frequency technique of shimmy. The torsional vibration
frequency of helicopter torsional vibration system is able to be distinguished under different working modes by means of the excitation to
power turbine speed of engine through the closed-loop system. The result show that the new scheme can measure the natural frequency of
torsional vibration precisely on the helicopter platform. |
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