SONONAI — Silent Flight. Certified.

eVTOL ACOUSTIC INTELLIGENCE PLATFORM · THREE TOOLS

WE MAKE AVIATION SILENT

From first rotor noise prediction, through 3D noise propagation over real cityscapes, to type certificate submission — SONONAI covers the complete eVTOL acoustic engineering workflow. Peer-reviewed physics, browser-based, no installation required.

⊛ ACOUSTIC ANALYSIS — SONIQ ⊚ NOISE PROPAGATION — PROPIQ ◈ CERTIFICATION PATH — CERTIQ

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ACOUSTIC ANALYSIS

Rotor noise · Cabin treatment · SPL mapping · Benchmarks

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NOISE PROPAGATION

3D volumetric SPL · ISO 9613 · OSM buildings · Contours

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ACOUSTIC CERTIFICATION

ICAO Annex 16 · EASA SC-VTOL-01 · EPNdB · Margins

SCROLL

ACOUSTIC PREDICTION · SONIQ

PREDICT NOISE.
DESIGN FOR SILENCE.

Real-time rotor noise computation using Lowson, FW-H, and BPM models. Far-field SPL heatmaps, cabin treatment design, directivity patterns — all in one browser-based tool. 18 aircraft types, 8 acoustic models.

OPEN SONIQ →

NOISE PROPAGATION · PROPIQ

PROPAGATE IN 3D.
SEE NOISE ON THE MAP.

Physics-based 3D hemispherical propagation over real cityscapes. ISO 9613 atmospheric absorption and ground effects, hard-reflecting OSM building footprints, volumetric SPL fields, wavefronts, and ground noise contours — click any point to probe local SPL and spectrum.

OPEN PROPIQ →

CERTIFICATION PATHWAY · CERTIQ

STRUCTURE COMPLIANCE.
FLY WITH CONFIDENCE.

Structured noise certification support from acoustic prediction to EPNdB calculation. ICAO Annex 16, EASA SC-VTOL-01, and FAR Part 36. Certification margin analysis across all measurement points.

OPEN CERTIQ →

WORKFLOW

HOW SONONAI WORKS

Three tools, one platform. Predict rotor noise at the source with SONIQ, propagate it in 3D over real cities with PROPIQ, and structure the certification case with CERTIQ.

AIRCRAFT DATABASE

SELECT YOUR AIRCRAFT

Choose from 18 preconfigured aircraft — Joby S4, Archer Midnight, Lilium Jet, Volocopter 2X, EHang 216, DJI M300, Wingcopter 198 and generic UAM layouts. Physics parameters auto-loaded: rotor count, diameter, RPM, blade count, chord, disc loading.

LOWSON · FW-H · BPM

RUN ACOUSTIC ANALYSIS

Instant computation of thickness noise, loading noise, and BPM broadband across 4 live charts: SPL spectrum with BPF tones highlighted, exterior vs cabin interior, harmonic levels, and polar directivity pattern.

JCA · HELMHOLTZ · MPP · CLD

DESIGN CABIN TREATMENTS

Apply 8 acoustic treatment models to the cabin interior spectrum. Each model shows absorption α(f) and cabin noise reduction charts. Adjust area fraction and see real-time SPL reduction.

ISO 9613 · INVERSE SQUARE LAW

MAP FAR-FIELD RADIATION

Generate HD ground-level SPL heatmap with configurable rotor positions, ground absorption, and A-weighting. Dashed contour rings at 75/65/55/45 dB certification limits. SPL vs distance chart.

12 AIRCRAFT · ±2.3 dB MAX

COMPARE WITH BENCHMARKS

Validate your predictions against 12 published eVTOL noise measurements from Joby, Archer, Lilium, Volocopter, EHang, Wisk, DJI, Wingcopter, Amazon, and NASA. Mean absolute error 1.6 dB.

SONIQ · LIVE PREVIEW

SONIQ OUTPUT

IMPORT ACOUSTIC DATA

CERTIQ reads SONIQ's one-third octave SPL spectra at each measurement microphone position for hover, take-off, and flyover reference procedures.

ISO 9613-1

ATMOSPHERIC CORRECTION

Normalise all levels to ICAO reference atmosphere (25°C, 70% RH). Frequency-dependent absorption correction α(f) applied at slant distance to microphone.

ICAO DOC 9501

PNL + TONE CORRECTION

Perceived Noise Level from noy conversion tables. Tone correction C where spectral irregularities exceed 1.5 dB slope criterion. PNLT = PNL + C at each timestep.

ANNEX 16 APPENDIX 2

EPNL CALCULATION

EPNdB = PNLT_max + duration correction D + max tone correction. Full uncertainty budget. Compliant with ICAO Doc 9501 procedure for VTOL aircraft.

EASA SC-VTOL-01 / ICAO CH.14

COMPLIANCE MARGIN

Compare EPNdB against MTOW-dependent limits. Cumulative margin across flyover, approach, and lateral measurement points. Report to 0.1 EPNdB resolution.

CERTIQ · CERTIFICATION MARGIN

SOURCE · ENVIRON · LOCATION · SOLVER

CONFIGURE THE NOISE SOURCE

Define the aircraft noise source — rotor configuration, sound power, altitude, and flight phase — then set atmospheric conditions including temperature, humidity, and wind.

OSM BUILDING FOOTPRINTS

PICK A REAL-WORLD LOCATION

Load OpenStreetMap building footprints for any location. Buildings enter the propagation domain as hard-reflecting walls, so urban shielding and reflections are captured in the field.

ISO 9613 · HEMISPHERICAL DOMAIN

RUN THE PROPAGATION SOLVER

Physics-based 3D hemispherical acoustic propagation with ISO 9613 atmospheric absorption and ground effects. Solver computes the full volumetric SPL field around the aircraft.

VOLUME · RAYS · WAVEFRONTS · ISO-SURFACE

EXPLORE THE 3D FIELD

Toggle visual layers in the live 3D viewport: volumetric SPL field, propagation rays, animated wavefronts, ground noise contours, iso-surfaces, vertical slices, and city buildings.

dB(A) · PROBE · METRICS

PROBE & ANALYSE RESULTS

Click any point in the domain to probe local SPL and its spectrum. Read peak SPL, ground-level dBA, domain min/mean/max, and source sound power from the analytics rail.

PROPIQ · 3D PROPAGATION

TOOL CAPABILITIES

WHAT EACH TOOL DOES

SONIQ handles source acoustic physics. PROPIQ handles 3D noise propagation into the real world. CERTIQ handles certification structure. Together they cover the complete noise engineering workflow for eVTOL type certification.

⊛ OPEN SONIQ → ⊚ OPEN PROPIQ → ◈ OPEN CERTIQ →

SONIQ

ACOUSTIC PREDICTION

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18 AIRCRAFT CONFIGURATIONS

Quadcopter, hex, octo, coaxial, tandem, lift+cruise, Joby S4, Archer Midnight, Lilium Jet, Volocopter 2X, EHang 216, Wisk Cora, DJI M300/600, Wingcopter 198, Zipline P2, tilt-wing, tiltrotor — all with physics-appropriate defaults.

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4 LIVE ACOUSTIC CHARTS

SPL spectrum with BPF harmonic overlay · Exterior vs cabin interior SPL · Harmonic level decay (8 harmonics) · Polar directivity pattern. All update in real time as parameters change.

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8 CABIN TREATMENT MODELS

JCA 5-parameter foam · Delany-Bazley · Miki · Biot limp-frame · Helmholtz resonator · Micro-perforated panel (MPP) · Constrained layer damping (CLD) · Glazing. Each with absorption + noise reduction charts.

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HD FAR-FIELD SPL HEATMAP

Multi-rotor incoherent summation at configurable positions. Ground absorption α. A-weighting. Dashed contour rings at 75/65/55/45 dB certification limits. Hover readout at any point.

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INDUSTRY BENCHMARKS

12-aircraft comparison with reported vs SONIQ predictions. Error bar chart, MTOW scatter, and per-aircraft calibration table with physics parameters and published references.

COMPLETE GLOSSARY

30+ defined terms with full formulae and citations covering fundamental quantities, rotor parameters, noise metrics, porous media, resonators, and certification standards.

PROPIQ

NOISE PROPAGATION

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3D PROPAGATION DOMAIN

Physics-based hemispherical acoustic propagation solved in a full 3D domain around the aircraft. Interactive viewport with orbit, top view, and animation controls.

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ISO 9613 ATMOSPHERE & GROUND

Frequency-dependent atmospheric absorption and ground effects per ISO 9613, with configurable temperature, humidity, and wind in the environment panel.

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REAL CITY BUILDINGS (OSM)

OpenStreetMap building footprints loaded per location and treated as hard-reflecting walls — see how urban geometry shields, channels, and reflects aircraft noise.

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7 VISUAL LAYERS

Volumetric SPL field · propagation rays · animated wavefronts · ground contours · iso-surface · vertical slice · 3D buildings. Toggle each layer live in the viewport.

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POINT PROBE & ANALYTICS

Click anywhere in the 3D field to probe local SPL and spectrum. Metrics rail reports peak SPL, ground dBA, domain min/mean/max, and source sound power level.

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SECURE ACOUSTIC WORKSPACE

Personal sign-in with registration and access approval — just like SONIQ and CERTIQ — plus an instant guest demo mode to explore the simulator without an account.

CERTIQ

CERTIFICATION TOOLKIT

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ICAO ANNEX 16 DATA PACKAGE

Structures SONIQ acoustic predictions into ICAO Annex 16 Appendix format. Generates flyover, approach, and lateral measurement point data with all required metadata and uncertainty budgets.

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EPNL CALCULATION CHAIN

Full ICAO Doc 9501 procedure: PNL from noy tables → tone correction C → duration correction D → EPNdB. Uncertainty budget per Appendix 2. Traceable to each standard and chapter.

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FLIGHT PATH ANALYSER

Reference procedure definition for hover, take-off, and overflight. Microphone array placement per SAE ARP1779. Ground-to-aircraft slant distance and geometry calculations at each timestep.

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NOISE MARGIN CALCULATOR

Certified EPNdB versus MTOW-adjusted ICAO Chapter 14 limits. Cumulative margin across all measurement points. Design trade-study: shows how rotor diameter, RPM, and blade count affect margin.

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ATMOSPHERIC CORRECTION

ISO 9613-1 absorption correction to ICAO reference conditions (25°C, 70% RH). Day/night ambient corrections per ISO 1996-2. Required for all noise certification measurement submissions.

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8 CERTIFICATION STANDARDS

ICAO Annex 16 Vol. I · EASA SC-VTOL-01 (2022) · SAE ARP1779 · SAE ARP1580 · ISO 9613-1/-2 · IEC 61672-1 · FAA AC 36-4C · ICAO Doc 9501 — all documented with chapter-level traceability.

LIVE VISUALISATIONS

SEE THE PHYSICS IN ACTION

Every visualisation in the landing page is computed live from the same physics model that runs inside SONIQ. No pre-rendered images.

FAR-FIELD SPL HEATMAP · HOVER

BPF DIRECTIVITY · LOWSON MODEL

THICKNESS NOISE · LOWSON (1970)

Monopole radiation from blade volume displacement. SPL ∝ B²Ω²R²chord·τ/r. Dominant at high tip Mach number (M_tip > 0.6). Scales with N rotors.

LOADING NOISE · FW-H (1969)

Dipole radiation from unsteady aerodynamic forces. SPL ∝ B·T·Ω/a₀·ρ·r². Dominant source in eVTOL hover at low tip Mach. Phase-adjusted for climb, cruise, approach.

BROADBAND · BPM (1989)

Trailing-edge, separation, and tip vortex self-noise. SPL ∝ ρ²a³·chord·δ*·M⁵/r². Boundary layer displacement thickness δ* from NACA 0012 blade-element data.

A-WEIGHTING · IEC 61672

Applied at blade-passing frequency BPF = B×RPM/60. Low BPF (EHang: 53Hz) penalised by −26 dB. High BPF (Lilium: 400Hz) penalised by only −5 dB.

GROUND REFLECTION · ISO 9613

Coherent ground reflection with configurable absorption coefficient α. Hard ground (asphalt): α=0. Soft ground (grass): α=1. Applied as correction to far-field SPL.

MULTI-ROTOR SUMMATION

Incoherent energy summation across all rotors: SPL_total = 10·log₁₀(Σ 10^(SPLᵢ/10)). Each rotor's contribution computed at its geometric position relative to the observer.

REFERENCES

BUILT ON PEER-REVIEWED
AEROACOUSTICS

No black boxes — every calculation traces to a published, peer-reviewed source.

THICKNESS NOISE

Lowson (1970)

J. Acoust. Soc. Am. 47(1B):371. BPF harmonics via Fourier decomposition. Monopole rotating source.

LOADING NOISE

Ffowcs Williams & Hawkings (1969)

Phil. Trans. R. Soc. A 264:321. Dipole from unsteady forces. Dominant in eVTOL hover.

BROADBAND (BPM)

Brooks, Pope & Marcolini (1989)

NASA RP-1218. Trailing-edge & tip self-noise. Industry standard semi-empirical model.

JCA POROUS MEDIA

Johnson-Champoux-Allard

J. Fluid Mech. 176 + J. Appl. Phys. 70. 5-parameter TMM on rigid backing.

MICRO-PERF PANEL

Maa, D.Y. (1998)

J. Acoust. Soc. Am. 104(5):2861. Sub-mm viscous resistance. Aircraft-grade liner.

CERTIFICATION

ICAO Annex 16 / EASA SC-VTOL-01

Vol. I Amendment 13 + SC-VTOL-01 (2022) + SAE ARP1779. EPNdB, limits, procedures.

PREDICT NOISE.
DESIGN FOR SILENCE.

PROPAGATE IN 3D.
SEE NOISE ON THE MAP.

STRUCTURE COMPLIANCE.
FLY WITH CONFIDENCE.

HOW SONONAI WORKS

BENCHMARKED AGAINST
PUBLISHED MEASUREMENTS

WHAT EACH TOOL DOES

SEE THE PHYSICS IN ACTION

BUILT ON PEER-REVIEWED
AEROACOUSTICS

GET IN TOUCH

PREDICT NOISE.DESIGN FOR SILENCE.

PROPAGATE IN 3D.SEE NOISE ON THE MAP.

STRUCTURE COMPLIANCE.FLY WITH CONFIDENCE.

HOW SONONAI WORKS

BENCHMARKED AGAINSTPUBLISHED MEASUREMENTS

WHAT EACH TOOL DOES

SEE THE PHYSICS IN ACTION

BUILT ON PEER-REVIEWEDAEROACOUSTICS

GET IN TOUCH

PREDICT NOISE.
DESIGN FOR SILENCE.

PROPAGATE IN 3D.
SEE NOISE ON THE MAP.

STRUCTURE COMPLIANCE.
FLY WITH CONFIDENCE.

BENCHMARKED AGAINST
PUBLISHED MEASUREMENTS

BUILT ON PEER-REVIEWED
AEROACOUSTICS