Sound absorption of TPMS lattices and acoustic metamaterials, before printing

Designs we simulate

• Triply periodic minimal surface (TPMS) lattices such as gyroid, Schwarz-P and diamond, including graded variants.
• Helmholtz resonator arrays and micro-perforated panels.
• Acoustic metamaterial unit cells and labyrinthine absorbers.
• Other 3D-printable panels and periodic porous structures supplied as CAD.

Why simulate before printing

• No print, no shipping, no lab queue. A physical test of a lattice sample typically means printing to the tube diameter, shipping and waiting for a laboratory slot.
• The geometry as designed. Print defects such as rough surfaces, trapped powder or resin, and dimensional tolerance can blur the effect of a design change. The simulation isolates the design itself.
• Many variants. Parametric families such as cell size, wall thickness, grading or air-gap depth can be compared side by side. From the tenth sample, each one costs $40.

How absorption arises in these structures

In lattices and perforated structures, sound energy is dissipated mainly by viscous and thermal losses in narrow channels, and absorption peaks appear at resonances set by the geometry and by any air cavity behind the sample. Increasing the air gap behind a sample shifts the main absorption peak to lower frequency. Our published comparison case shows this shift for 5, 10 and 15 mm gaps.

As-designed versus as-printed

Printed parts never match the CAD exactly. If you want to know how sensitive your design is to manufacturing tolerance, we can run an as-printed tolerance study as a custom project.

Accepted files and required inputs

• Geometry: STL, STEP, IGES, 3MF, OBJ, or a ZIP of these. Up to 95 MB per file and 10 files per request.
• Either the full sample as it would sit in the tube, or one periodic unit cell plus the sample thickness and diameter.
• Units of the CAD file (for example millimetres), so the geometry is scaled correctly.
• Backing condition: rigid backing, or the depth of any air gap behind the sample.
• Tube diameter and frequency range: Ø29 mm (about 500–6300 Hz), Ø100 mm (about 50–1600 Hz), or both stitched into one curve.
• Whether you also need transmission loss.

Pricing

• $50 per sample for samples 1 to 9, and $40 per sample from the tenth onward. For example, 10 samples cost $490.
• Add-ons: transmission loss +$20 per sample; full band (both tube diameters) +$15 per sample; results within 24 h +50%.
• Custom design studies, such as optimisation for a target band, are quoted per project.
• You pay by PayPal (card accepted) only after we confirm your files can be simulated. Prices in USD, excluding any applicable taxes.

Not covered

Foams and fibrous materials with no geometry file cannot be simulated this way, because their microstructure is not available as CAD. Random-incidence absorption (ISO 354 reverberation room) is also outside the scope of an impedance-tube simulation.