|Vehicle Vibrations Assessment and Reduction using Innovative Methods |
|Applied Vehicle Technology|
Aging Systems, crosspanel, Evaluation, Invehicle, maintainability and operability, Measurement, Reduction, Rotary Systems, standards and criterion, Vibration, Whole Body Vibration WBV
Challenges with vibration in military vehicles has been discussed and addressed within the NATO RTO/AVT Support Programme Projects since 2008.
SVK-AVT-08 2/P – “Design criteria for vibration diagnostics of a jet gas turbine engine” was the first project dealing with vibrations. This NATO RTO/AVT support project was considering development of health assessment criteria for the gas turbine engine vibrations used by the Slovak Air Forces. This project resulted in methodology of evaluating the criteria statement.
The follow-on NATO STO/AVT support project SVK-AVT-12/01 – “Application of the advanced analysis methods to health monitoring of gas turbine engines operating in the Slovak Air Forces” was focusing on the development of analysis tools and health assessment criteria for the gas turbine engines vibrations. This project resulted in a methodology of signal processing to evaluate vibration criteria.
Based on the results from the previous projects, support project SVK-AVT-16/01 – “Evaluation of in-vehicle vibrations and their effect on vehicle structures and personnel health and performance” continued this work. This project dealt with the risk of vibration exposure to both vehicle structures and military personnel, and resulted in developing measurement techniques and assessment criteria for vehicle and operator vibration exposure.
Vibrations in vehicles are caused mainly by their operation, e.g., ground vehicle in un-prepared and irregular terrain or by intrinsic vibrations induced by rotary subsystems and components, such as rotors, engines and wheels. While the first type of vibration tend to have higher magnitude and lower frequency, the latter type of vibration is more acute with higher frequencies. Both types of vibrations pose several problems to operations by, e.g., a) damaging of structural components; b) increasing operation and maintenance cost; c) limiting the ability to control the vehicle d) contribute to fatigue of the operator e) cause long-term health effects of personnel.
In particular, vibration has detrimental effect on personnel operating the vehicle. This could result in temporarily impairing the operator’s ability to control the vehicle, contributing to fatigue of occupants and may lead to long-term chronic issues such as neck strain and back pain of personnel, including disability in worst case.
Perform a background search of state-of-the-art techniques and equipment of in-vehicle vibration measurement, assessment and reduction to improve operability and maintainability.
Develop synergies within the participation nations to decide on possible innovative ways to apply new sensing and data acquisition technologies to quickly characterize in-vehicle vibration levels in ageing military vehicles. Additionally, limit the footprint of such measurement systems on new designs, by reduction of, e.g., volume, mass, power requirements.
The measurement technique needs to be optimized in order measure and analyse the appropriate vibratory data in the field that ensures easy integration with the vehicle. Such a system could include wireless data transfer, ability to self-power and ease of data analysis in order to compare with existing vibration standards and operational criterion for equipment and crew.
Measurement techniques, including hardware, software and self-contained equipment packages.
Current regulation and need for the issuance of recommendations to change the regulation;
Impact of vibrations on vehicle life-cycle and scheduled maintenance tasks;
Impact of in-vehicle vibration measurements on crew performance and health.