FEASIBILITY STUDY ON PROPELLER VIBRATION RECORDING SYSTEM.
GENERAL ELECTRIC CO SCHENECTADY N Y
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Feasibility studies were made of recording propeller strains at 64 positions for 200 hours of flight. The frequency response of the data extended from d.c. to 1000 cps. A system has been devised to record the signal characteristics of interest using an intermittently operated magnetic tape recorder to record high level signals at full frequency response and a slow speed recorder to maintain a continuous log of the peak signal history. A key feature of the system is the elimination of slip rings to transmit signals from, and power to, the propellers. Many of the system components are now in production. A few require development. The principal limitation of the system is the difficulty of measuring static strains over a wide temperature range. A method of compensation is proposed which corrects temperature errors over a restricted temperature range. Author
- Recording and Playback Devices