What it is
Acoustic modeling uses a model of a system’s geometry and materials — 3-D where needed, simpler where not — to predict how airborne sound behaves: the levels reached at a receiver, the resonances of cavities and ducts, and how sound escapes through openings and outlets.
Where aeroacoustics asks how flow generates sound, acoustic modeling asks where that sound goes — through ducts and enclosures, around obstacles, out of openings and to an operator position or measurement microphone. The field’s tools range from wave-based (finite-element or boundary-element) models at lower frequencies, to statistical or geometric methods where wavelengths are small compared with the geometry, to analytical duct and enclosure estimates when those are enough. The right choice depends on geometry, frequency range and the decision at hand.
Problems it helps solve
- Transmission loss of exhaust and intake silencers, before a prototype is built
- Predicting the sound level at an operator position or specified measurement location
- Acoustic resonances in cavities, enclosures or duct systems
- Understanding how enclosure openings, louvers and barriers affect the noise that escapes
- Comparing absorptive liners, treatments or geometry changes on paper
- Assessing acoustic performance before any prototype exists
When to use it
- A product must meet a sound level requirement and there is no hardware to test yet
- Testing has shown a problem, but not where it comes from or how it escapes
- An acoustic treatment has been specified but its benefit has not been quantified
- A physical test plan needs to focus on the frequencies and paths that matter most
Typical engineering inputs
- 3-D geometry of the relevant acoustic spaces, enclosures, ducts and openings
- Source information: measured or manufacturer sound data, or estimated sound power
- Material and treatment properties where known
- Frequency range of interest and receiver or measurement positions
- Target levels or requirements
Early-stage or incomplete inputs are normal — scoping establishes what is actually needed. Proprietary geometry is shared only after first contact, by a method agreed with you.
How SH Consulting approaches it
- Define the acoustic question. Set the frequency range, receivers and the quantity that will be compared against the target.
- Build the model. Prepare a 3-D acoustic model at the fidelity the question requires — no more, no less.
- Define sources and boundaries. Represent sources and materials from measured or manufacturer data, or engineering estimates.
- Solve and check. Solve, then check results for physical consistency against data or engineering estimates.
- Evaluate options. Run design or treatment variants and summarize what each changes.
Outputs
- Predicted sound pressure levels and spectra at locations of interest
- Visualizations of acoustic pressure fields, modes and propagation paths
- Side-by-side comparison of design or treatment variants
- An engineering summary with recommendations and stated model limitations
Design decisions it supports
- Silencer chamber, baffle, perforate and lining layout
- Enclosure geometry, opening and louver placement, and lining selection
- Where acoustic treatment will actually pay off — and where it will not
- Which frequencies and transmission paths a test program should target
Attenuation and back pressure, side by side
Industries
- Generator Sets & Power GenerationExhaust silencers, ventilation-path silencers, louvers and enclosure levels against a site sound limit.
- Filtration, Intake & Exhaust SystemsSilencer and intake attenuation weighed against the pressure drop they add.
- Industrial Machinery ManufacturingDuct, intake, exhaust and enclosure acoustics on machinery with demanding sound targets.
- Electrical EquipmentHow louvers, vents and openings let fan and airflow noise escape fan-cooled cabinets.
- Commercial HVAC, Air Handling & Data-Center CoolingPlenum and discharge noise; outdoor-unit noise at the property line.
Specialty in detail: engine and generator noise simulation
Related services
- CFD Flow & Pressure DropPredicts the back pressure and flow the same silencer or treatment adds.
- Noise Control & MitigationUses the acoustic model to compare candidate fixes.
- Aeroacoustics Engineering ConsultingFor problems where the source mechanism itself is still unclear.