Active fluid borne noise reduction for aviation hydraulic systems

Start Page
307
End Page
318
Citation
Proceedings of the 10th International Fluid Power Conference (IFK) : Volume 1; Symposium March 8: 307-318 (2016)
Contribution to Conference
10th International Fluid Power Conference, IFK 2016  
Publisher
Technische Universität Dresden
The aviation environment holds challenging application constraints for efficient hydraulic system noise reduction devices. Besides strong limits on component weight and size, high safety and reliability standards demand simple solutions. Hence, b silencers like inline expansion chambers and Helmholtz-Resonators are state-of-the aboard commercial aircrafts. Unfortunately, they do not meet today's noise attenuation aims regarding passenger comfort and equipment durability. Significant attenuation performance is expected from active concepts that generate anti-phase noise However, such concepts remain a long term approach unless related costs, e.g. due to additional power allocation and real-time control equipment can be avoided. In t paper an active fluid borne noise attenuation concept is discussed that accounts for the mentioned constraints. An aircraft hydraulic pump is considered as main noise source The active attenuator is an in-house rotary valve design. The basic feature is a known direct shaft coupling principle of pump and rotary valve, so no speed/ frequency control of the valve and no separate power supply are required. The common-shaft principle further simplified here and proposed as integral feature of future 'smart pumps'.
Subjects
aviation
fluid power
DDC Class
333.7: Natural Resources, Energy and Environment
620: Engineering
380: Commerce, Communications, Transport