Send an STL or STEP file. We simulate your design in a virtual impedance tube and return α(f), surface impedance and transmission loss. You skip printing the sample, shipping it, and waiting for a lab slot.
TPMS lattices, resonator arrays and metamaterial cells have to be 3D printed before a lab can test them. Print defects then blur the result you wanted to see. We test the geometry exactly as you designed it.
STL, STEP or IGES of a single sample, or the unit cell plus the sample thickness.
Tube diameter, frequency range, backing condition (rigid or air gap) and whether you need transmission loss.
We resolve the full pore geometry, including visco-thermal losses in the narrow channels, inside a model of the standard tube configuration.
CSV data, publication-ready plots and a short technical report on the method and its validation.
| Quantity | Description | Standard configuration |
|---|---|---|
| α(f) | Normal-incidence sound absorption coefficient | ISO 10534-2 / ASTM E1050 |
| Zs(f) | Normalised surface impedance, real and imaginary parts | ISO 10534-2 |
| R(f) | Complex reflection coefficient | ISO 10534-2 |
| TL(f) | Normal-incidence transmission loss, from the transfer matrix | ASTM E2611 |
| Report | Method, mesh convergence, validation reference and plots | PDF + CSV |
Most clients use us to narrow a design down, then certify the final version physically.
Two cases from the literature, each simulated from geometry alone and compared with the published measurement. No parameters were fitted to the measured data.
| Air gap | fpeak sim | fpeak exp | Δf | αpeak sim / exp |
|---|---|---|---|---|
| 5 mm | 2610 Hz | 2720 Hz | −4.1 % | 1.00 / 0.99 |
| 10 mm | 1800 Hz | 1900 Hz | −5.2 % | 1.00 / 0.99 |
| 15 mm | 1485 Hz | 1575 Hz | −5.7 % | 0.99 / 0.98 |
At every gap the model reproduces the peak absorption, the shape of the curve, and how the peak moves as the gap changes. The measured peaks sit 90–115 Hz (about 5%) higher in frequency, a consistent offset across all three configurations. The simulation was solved in 45 Hz steps.
| Peak | f sim | f exp | Δf | α sim / exp |
|---|---|---|---|---|
| 2nd | 2040 Hz | 1970 Hz | +3.6 % | 0.87 / 0.84 |
| 3rd | 3720 Hz | 3675 Hz | +1.2 % | 0.94 / 0.91 |
| 4th | 4620 Hz | 4665 Hz | −1.0 % | 0.98 / 0.96 |
The lattice comes from an international round-robin study in which several laboratories printed and tested the same designs. The model resolves every pore and channel of the printed cell and places all three peaks in this band within 4% of the measurement. The simulation was solved in 60 Hz steps.
Every sample includes α(f), surface impedance, reflection coefficient, CSV data, plots and a short report. Your first nine samples are $50 each, and every sample from the tenth onward is $40.
| Add-on | What you get | Price |
|---|---|---|
| TL | Transmission loss from the four-microphone transfer matrix (ASTM E2611 configuration) | +$20 / sample |
| Full band | Both tube diameters (Ø100 and Ø29 mm) stitched into one curve from 50 Hz | +$15 / sample |
| Priority | Results within 24 h | +50% |
Prices in USD, excluding any applicable taxes. Example orders: 1 sample $50 · 9 samples $450 · 10 samples $490 · 20 samples $890.
I hold a PhD in Mechanical Engineering, and my work spans fluid mechanics, acoustics and heat transfer. I set up, run and check every simulation myself, including the validation cases above.
It is a numerical simulation of the ISO 10534-2 test configuration (and of ASTM E2611 for transmission loss). It reports the same quantities, but it is not an accredited measurement. If you need a certified report for compliance, use our results to choose the final design and then have that design measured by an accredited lab.
In our two validation cases, peak frequencies agreed with the published measurements within 1–6%: a micro-perforated panel at three air gaps, and a 3D-printed periodic lattice from an international round-robin study. Differences between a model and a tube test usually come from the printed sample: surface roughness, trapped powder or resin, and dimensional tolerance. We can quantify those effects with an as-printed tolerance study.
No. For designs supplied as CAD, we resolve the pore geometry directly. The air properties and the geometry define the result.
STL, STEP and IGES. For periodic lattices, you can send just the unit cell along with the sample thickness and diameter.
Yes. We sign your NDA or ours before you upload anything, use your files only for your project, and delete them after delivery unless you ask us to keep them.
Yes. The service is fully remote and we work with universities and companies worldwide. Payment by card or bank transfer.
We reply within one business day with a quote and an NDA if you need one.