NASA Technical Reports Server (NASA) · 1987 · 31 citations · 6 references
EngineeringAerospace EngineeringMechanical EngineeringAcousticsStructural DynamicsVibrationMachine VibrationRotor DynamicsRotordynamicsStructural VibrationVibration MeasurementVibration TestingGear Mesh VibrationHarmonic Vibration AnalysisPlanetary Gear SystemsPower Spectral DensityPower Spectral Density AnalysisTorqueTransmission VibrationVibration In Transmission Systems
Experimental vibration tests covering a range of torque and speed conditions were performed on the OH-58A helicopter main rotor transmission at the NASA Lewis Research Center. Signals from accelerometers located on the transmission housing were analyzed by using Fourier spectra, power spectral density functions, and averaging techniques. Most peaks of the Fourier spectra occurred at the spiral bevel and planetary gear mesh harmonics. The highest level of vibration occurred at the spiral bevel meshing frequency. Transmission speed and vibration measurement location had a significant effect on measured vibration; transmission torque and measurement direction had a small effect.
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