Investigation on Experimental Techniques to Detect, Locate, and Quantify Gear Noise in Helicopter TransmissionsNational Aeronautics and Space Administration, Scientific and Technical Information Branch, 1985 - Helicopters - 96 pages |
Common terms and phrases
75 centimeter ACCELEROMETER ACCELEROMETER LOCATIONS accuracy and repeatability acoustic field acoustic intensity contour acoustic intensity data acoustic intensity measurement acoustic intensity probe angular acceleration angular velocity automating BELL OH58 HELICOPTER calculating acoustic intensity Chung Cleveland closed end gearbox DARM data in g's desktop computer digital control unit equations FREQ HZ Frequency in Hertz g's at position gearbox location H-configuration Hertz Acceleration data Hertz Figure instrumentation robot arm intensity contour map Intensity Measurement System interface kinematic solutions LIN AMP g Measurement System RAIMS measuring acoustic intensity motor negative voltage noise in helicopter OH58 HELICOPTER TRANSMISSION op-amp Optic Encoder particle velocity position 12 position 9 position control programmed reference frame Robotic Acoustic Intensity rotation Sound Intensity Sound Intensity Measurements sound pressure spatial resolution speaker system spectrum analyzer torque transducer vector velocity command signal vibration data WLEN wrist x-y plane