STO-Activities: (no title)
Activity title:
Characterization of structure-borne noise in military vehicles
Activity Reference:
AVT-370
Panel:
AVT
Security Classification:
NATO UNCLASSIFIED
Status:
Active
Activity type:
RTG
Start date:
2023-01-01T00:00:00Z
Actual End date:
2025-12-31T00:00:00Z
Keywords:
acoustic signature, personnel health, stealth, structural fatigue, Structureborne noise, vibration
Background:
High level of structure-borne noise is an undesired characteristic of many military vehicles. Excessive noise caused by vibration generating systems within vehicles not only cause premature fatigue of structural components that leads to increase in operation and maintenance cost, but also reduce stealth capability of the vehicle, contribute to reduced performance and even occupational health issues of the personnel. Research on vibration issues of military vehicles was carried out by several NATO nations in the past through NATO Support Project between Canada and Slovakia. These projects include measurement of helicopter engine vibration levels at constant speed (SVK-AVT-08 2/P) and changing speed (SVK-AVT-12/01) to develop a vibration monitoring methodology for diagnosis of engine and aircraft structural damages. The support project (SVK-AVT-16/01) trained Slovakian colleagues to assess vibration impacts on both the vehicle and personnel. In 2019, AVT-ET-206 team was established to identify suitable topics in the area of vehicle vibration assessment and reduction using innovative methods for further research and collaborations among NATO nations.
Objectives:
The detectability, combat capability and survivability of military vehicles strongly depend on concealing the vehicle during operations. One of the critical stealth characteristics of a vehicle is the acoustic signature of the vehicles. In particular, excessive in-vehicle vibration results in high acoustic signature, which causes undesirable physiological (hearing loss, fatigue etc.) and psychological (irritation, concentration loss, decreased working capacity etc.) disorders of the crew. As such, it is important to characterize the vibration and noise signatures in operations and maintain in-vehicle vibration and noise levels within MIL-STD or other recommended limits for stealth and habitability of the vehicle.
Within this scope, this Technical Team aims to develop synergies with the participation nations to carry out the research in two phases. The first phase is to define the principles and requirements for sufficient, rapid and accurate data acquisition of vehicle vibration and noise signatures in-situ, with the vehicles selected by the participating nations. A literature survey of state-of-the-art measurement techniques will be performed and novel approaches for sensing and data acquisition will be proposed for multi-domain vehicle platforms. Based on the type of vehicles and operational conditions, the measurement system requirements and considerations such as the environmental factors, operational conditions, measurement locations, sensor selections, mounting issues, and sampling parameters, will be defined.
The second phase is to study structure-borne noise limit for the equipment. Currently there are not sufficient standards to define vibration induced noise criteria for military vehicles, and the applicability of existing standards are sometimes questionable within the operational context. Therefore, the Technical Team aims to determine the adequacy and applicability of existing structure-borne noise and vibration standards with regards to systems installed in the selected vehicles. In this context, a roadmap will be developed to define the vibration and structure-borne noise limits for military vehicles through implementing approaches such as stochastic and deterministic methods.
Topics:
The topics include (in no particular order)
• Characterization of vibrations on the acoustic signatures and stealth of the military vehicles,
• Assessment of in-vehicle structure-borne noise on crew performance and health,
• In-situ vehicle vibration and noise measurement and analysis techniques,
• Requirements and principles for rapid and accurate in-situ vibration measurement,
• Survey of existing regulations and standards as well as the need for the changes,
• Stochastic and deterministic approaches for defining the limits for the desired vibration levels,
• Regression analysis models.
Contact:
Open2Partners:
Title:
Created at 10/11/2021 15:00 by System Account
Last modified at 16/05/2024 21:00 by System Account
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