ASA 127th Meeting M.I.T. 1994 June 6-10

3aSAa3. Aeroacoustic sources of high speed maglev trains.

Carl E. Hanson

Harris Miller Miller & Hanson Inc., 429 Marrett Rd., Lexington, MA 02173

Noise has been identified as a potential source of concern associated with the introduction of high speed maglev trains into the existing transportation system in the United States. The first operational maglev systems have been shown to generate high noise levels at high speeds, with noise levels over 100 dBA at 25 m typical for the maximum cruising speeds. At speeds greater than 150 miles per hour, the dominant noise source is of aerodynamic origin, proportional to the 6th power of velocity at high speeds, and 8th power dependency at very high speeds. An investigation of the noise generated by maglev systems was conducted to determine noise sources, develop noise criteria for high speed maglev systems, prepare design guidelines for noise control, and recommend an acoustic test facility for maglev research. This paper describes the findings of the study including recommendations for further research to develop a better understanding of the aerodynamic sound generation associated with high speed maglev operations. [Work performed under contract to U.S. Department of Transportation as part of the National Maglev Initiative.]