INVESTIGATION OF A WIDE BAND NOISE GENERATOR.
Final rept. Mar 64-Feb 67,
GRUENZWEIG UND HARTMANN A G LUDWIGSHAFEN AM RHEIN (WEST GERMANY)
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Shock waves are generated by a displacement body rotating at the end of a rotor arm with supersonic velocity. The echoes of the shocks in a reverberant room build up a high-energy sound field with a broad and rather flat spectrum. Acoustic power up to 30 kW is generated with an efficiency of 23 percent. The measurement of the radiated acoustic power is described and the optimum shape and dimensions of the displacement body for good acoustic energy conversion are investigated. Design specifications for the rotor arm are given. Author
- Test Facilities, Equipment and Methods