STRUCTUAL DYNAMICS & ACOUSTICS SERVICES
Low Frequency and High Frequency
Capabilities Overview
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Analysis (vehicle and payload analyses) of both structural and acoustic coupled responses for the full frequency range
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Noise control treatment solutions and design
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Integrated large scale test (reverberant field) and treatment testing (impedance, absorption, linearity)
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Aeroacoustic Simulation and Analysis for Ascent loads and flow noise
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Transient Computational Fluid Dynamic (CFD) analysis to calculate aeracoustic loads
Vibroacoustic Development Cycle
Acoustics and structural dynamics design lags other design efforts of a system (structures, payloads, fuel tanks, etc.) due to the need for these design inputs
Rapid iteration of acoustic treatment design in response to changes is an absolute must, at any stage in development.
As system design freezes, final testing and analysis are performed as needed.
Design and treatment package completed and delivered by ZIN to customer.
Image Credit: NASA
Vibroacoustic Development Cycle : Analysis
Vehicle or payload Structural Finite Element Model (FEM) developed or used as input.
Low Frequency
Finite Element Method (FEM)
Boundary Element Method (BEM)
High Frequency
Statistical Energy Analysis (SEA)
Results compared to requirements to assess treatment attenuation.
Image Credit: NASA
Treatment Solutions
Low frequency treatment development
Patented tunable resonator technology
High TRL Helmholtz resonator technology with high maturity, for SLS Block 1B Universal Stage Adapter
High Frequency Treatment Development
Lightweight acoustic foam panels, designed for extreme temperature and load conditions
Image Credit: NASA
Vibroacoustic Development Cycle: Design
If treatment required to reduce acoustic levels, design development begins
Proven, existing designs used, in configurations for meeting requirements
If necessary, new design concepts developed.
Image Credit: NASA
Vibroacoustic Development Cycle: In-house Testing
In House Testing
Absorption test
Low frequency high intensity Impedance Tube Testing
Temperature, adhesives, joining methods testing, for flight conditions
Large-scale Testing
With experienced outside partners, with history of work on test planning and successful implementation
Reverberant and Direct Fields acoustic testing
Modal testing and analysis
Decay testing
Predictions of test results, prior to testing and post-test correlation.
Image Credit: NASA