Impulse Assessment of the Enhanced Combat Helmet - Marine Corps and Five Samples of the ComTac (trademark) V Hearing Defender Headset
Abstract
The impulse peak insertion loss (IPIL) is the standard measure of attenuation provided by hearing protection devices (HPDs) in response to an impulsive noise. This technical memorandum describes the IPIL testing conducted on a combined configuration that included the Gentex (registered trademark) Corporation Enhanced Combat Helmet Marine Corps and the ComTac (trademark) V Headset. Testing included two test modes for the ComTac (trademark) V: passive and active. In all occluded conditions, the ECH-M and the ComTac (trademark) V were donned. Testing was completed in accordance with the ANSI standard S12.42-2010. All device samples were tested at the nominal levels of 150, 160, and 170 decibel peak (dBP, re: 20 mu Pa). A total of five samples were fitted to an acoustic test fixture two times each for a total of 10 trials per test level in both the passive and active test modes. Results suggest that the ComTac (trademark) V Headset, when functioning properly and fitted in combination with the ECH-M can adequately protect against impulses below 166.2 dBP in the passive test mode, and 165.6 dBP in the active test mode.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 09, 2022
- Accession Number
- AD1175391
Entities
People
- Alexa H. Kolias
- Derek W. Schwaller
- Jeremy S. Federman
- Stephanie J. Karch
Organizations
- Naval Submarine Medical Research Laboratory