MEASUREMENT and PREDICTION of AIRCRAFT VIBRATION

BOTH experimental and analytical phases of the aircraft vibration problem are covered by Mr. Critchlow, who has made a thorough study of this increasingly important subject.

As a result of this research work, methods of calculating coupled modes of vibration of aircraft structures have been developed that agree quite closely with measured data.

An important factor in cutting down the time, labor, and expense required in making vibration and flutter studies has been the adaptation of punched card calculating machines to perform the routine calculations.