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Evaluation of impulse noise criteria using human volunteer data
The Journal of the Acoustical Society of America
|October 30, 2001
Summary
Four impulse noise auditory injury criteria were evaluated against human volunteer data. All tested criteria were found to be overly conservative, suggesting a need for revision in hearing protection standards.
Area of Science:
- Auditory Science
- Occupational Safety
- Acoustics
Background:
- Military standards for impulse noise auditory injury criteria exist in NATO countries.
- These criteria include MIL-STD-1474D (USA), Pfander (Germany), Smoorenburg (Netherlands), and L(Aeq8) (France).
- Human volunteer data on hearing protection effectiveness against blast overpressure was available.
Purpose of the Study:
- To evaluate the conservatism of four international impulse noise auditory injury criteria.
- To compare these criteria against human volunteer data under specific exposure conditions.
Main Methods:
- Logistic regression analysis was used to correlate four impulse noise criteria with human volunteer data.
- Data involved subjects wearing single-hearing protection exposed to increasing blast overpressure.
Main Results:
- All four evaluated criteria (MIL-STD-1474D, Pfander, Smoorenburg, L(Aeq8)) were found to be overly conservative.
- The degree of conservatism ranged from 9.6 to 21.2 dB for the tested subjects.
- MIL-STD-1474D was 9.6 dB less stringent than the observed injury threshold for 95% protection.
Conclusions:
- The current impulse noise auditory injury criteria are likely too conservative for single-hearing protection scenarios as tested.
- Revisions to these criteria may be necessary to better reflect actual human injury thresholds.
- Further research could validate these findings across diverse populations and exposure conditions.
