Double-notch single-pumper fluid mounts

Passive fluid mounts are widely used in the automotive and aerospace applications to isolate the cabin from the engine noise and vibration. In the case of aerospace fixed wing applications, when fluid mounts are used, they are placed in between the engine and the fuselage, and the notch frequency of...

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Bibliographic Details
Published in:Journal of sound and vibration 2005-07, Vol.285 (3), p.697-710
Main Author: Vahdati, Nader
Format: Article
Language:English
Subjects:
Acoustics
Aerospace engines
Automotive engines
Computational fluid dynamics
Exact sciences and technology
Excitation
Fluid flow
Fluids
Fundamental areas of phenomenology (including applications)
Notches
Physics
Solid mechanics
Structural acoustics and vibration
Structural and continuum mechanics
Vibration
Vibration, mechanical wave, dynamic stability (aeroelasticity, vibration control...)
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Summary:Passive fluid mounts are widely used in the automotive and aerospace applications to isolate the cabin from the engine noise and vibration. In the case of aerospace fixed wing applications, when fluid mounts are used, they are placed in between the engine and the fuselage, and the notch frequency of each fluid mount is tuned to either N1 frequency (engine low speed shaft imbalance excitation frequency) or to N2 frequency (engine high speed shaft imbalance excitation frequency) at the cruise condition. Since current passive fluid mount designs have only one notch, isolation is only possible at N1 or at N2, but not both. Here, in this paper, a double-notch passive fluid mount design will be presented, which has two notch frequencies, and therefore can provide vibration and noise isolation at two frequencies. In this paper, the new fluid mount design concept and its mathematical model and simulation results will be presented.
ISSN:0022-460X
1095-8568
DOI:10.1016/j.jsv.2004.08.045