iMAST Quarterly, Number 1, 2004
Abstract
This quarterly briefly addresses engine fretting evaluation. The feature article is titled "Light Armored Vehicle Noise Control". Exploiting the acoustics expertise resident at ARL Penn State, engineers were asked by the Marine Corps to address noise issues related to the Light Armored Vehicle. The integration of advanced materials, manufacturing processes, health monitoring, and acoustic tailoring promotes reductions in gross weight, vibration, interior noise, and life-cycle cost, as well as increases in mission range, survivability, and operational availability. The Mobile Electronic Warfare Support System Product Improvement Program (MEWSS PIP) integrated an advanced electronic warfare suite into a light armored vehicle identical to ARL's in-house LAV-25 Generation I, Figure 1. The mission of the MEWSS PIP vehicle is to intercept, identify, locate, and exploit modern threat radio communications and battlefield radars, as well as to disrupt or deny the threat's use of the electromagnetic spectrum. Typical missions are of sixteen (16) hours duration; the bulk of the time spent with the vehicle stationary and exercising its electronic warfare capabilities. Air conditioning system evaporator fans were identified as the dominant sources of noise in an LAV modified to conduct electronic warfare operations. The fan source levels were reduced by replacing the baseline fans with quiet replacement units that met all system aerodynamic requirements. The airborne noise transmission paths from the evaporator fans to the crew locations were controlled with a lined plenum attenuator and ventilation duct silencing treatments. These simple, cost-effective treatments reduced the interior A-weighted sound levels from 110 dB to 92 dB and had no effect on vehicle operation.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 2004
- Accession Number
- ADA497219
Entities
Organizations
- Pennsylvania State University