A Study of the Effect of Terrain on Helicopter Noise Propagation by Acoustical Modeling
Abstract
An experimental program was conducted to evaluate the applicability of acoustical modeling techniques to study the effects of terrain on helicopter noise propagation. Comparison of model results with flyover data of a full scale UH-1 helicopter showed very good correlation with 500 ft altitude data and moderately good correlation with 50 ft altitude data. Model studies of the effects of the blocking and channeling of sound by barriers, such as hills, shows good correlation with expected results for simple cases with the model providing useful results for more complex cases. Further full scale verification is recommended to further exchange confidence in the modeling technique for application to helicopter detection studies.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 23, 1981
- Accession Number
- ADA097626
Entities
People
- Harry Sternfeld Jr.
Organizations
- Boeing Rotorcraft Systems