A Decoupled Modal Reduction Method for the Steady-State Vibration Analysis of Vibro-Acoustic Systems with Non-Classical Damping

This paper presents a decoupled modal reduction method for the steady-state vibration analysis of vibro-acoustic systems characterized by non-classical damping. The proposed approach initially reduces the order of the coupled governing equations of the vibro-acoustic system through the utilization o...

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Bibliographic Details
Published in:Acoustics (Basel, Switzerland) Switzerland), 2024-09, Vol.6 (3), p.792-804
Main Authors: Gao, Ruxin, Fan, Shanshan
Format: Article
Language:English
Subjects:
Acoustics
Boundary conditions
Complexity
Computational efficiency
Cost analysis
Coupled modes
decoupled modal reduction
Decoupling
Efficiency
Eigenvalues
Finite element analysis
finite element method
Frequency analysis
Frequency ranges
Methods
Mode superposition method
non-classical damping
Numerical analysis
Sparsity
Steady state
steady-state vibration
Superposition (mathematics)
Systems analysis
Velocity
Vibration analysis
Vibration damping
vibro-acoustic system
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Summary:This paper presents a decoupled modal reduction method for the steady-state vibration analysis of vibro-acoustic systems characterized by non-classical damping. The proposed approach initially reduces the order of the coupled governing equations of the vibro-acoustic system through the utilization of non-coupled modes, subsequently employing the complex mode superposition technique to address non-classical damping effects. By leveraging non-coupled modes, this method circumvents the need to solve for coupled modes as required in traditional modal reduction techniques, thereby diminishing both computational complexity and cost. Furthermore, the complex mode superposition method facilitates the decoupling of coupled governing equations with non-classical damping, enhancing computational efficiency. Numerical examples validate both the accuracy and effectiveness of this methodology. Given that modal decomposition is independent of frequency, an analysis of computational efficiency across various stages further substantiates that this method offers significant advantages in terms of efficiency for computational challenges encountered over a broad frequency range.
ISSN:2624-599X
2624-599X
DOI:10.3390/acoustics6030044