ComponenteDevoto_building up Acoustic Tests

In order to develop acoustic test on my component, to be held in september, I publish this page: I wish i could collect and publish comments and ideas on it. This way, this page wants to be just a start up, to be reviewed and updated and commented.



Acoustic Tests will investigate potentials of my component via a number of 1:10 to scale model. Here it is a brief project of it.

The material amount needed is, according to scheduling:

  • 240.1 mm x 250 mm x   0.4 mm (metal?) sheet, to be cutted into strips (width 34.3 mm) and holed
  • 153.5 mm x 250 mm x   4 mm (metal?) sheet, to be cutted into strips (width max=34.3 mm, min=10mm) and holed
  • screws and bolts (2x)

This will produce one small mock up, dimensions 34.3 mm x 30.8 mm x 250 mm. In order to make tests, it will be necessary to have at least two of these components.

At present, i imagine this component to be jointed together via bolts.

QUESTION 1: is it necessary to create a "cap" for both the endings of the component? A very simple piece of metal sheet bended and holed should be easy to produce.

This mock up could be pur first try with CNC machineries: i would like ot understand how to export data contained in this model.



Equipment needed by tests is: a piezo loudspeaker and an idrophone. The anecoic ambient could be simulated by a huge room -nonanhecoic-, because of  tester dimensions.

In the last post: Scaling frequncies, distances [...] i could obtain IR measurements to evaluate by auralization.

In order to evaluate a component scattering coefficient -s- and homogeneous scattering  coefficient -d- , it is possible to use "Two-dimensional boundary measurement technique". In our case, the component is not real scale (which essentially mean that we can take one measurement at a time), and we want to collect Impulse Responses to convolve and auralize them. So:

QUESTION 2: Is it still necessary to take measurements on the boundaries of a semi-circle? Rather, shouldn't measurements have to be taken in order to simulate the listening?

QUESTION 2_bis: By convolving the signal aren't we deleting the effect of two-hears listening that we want to evaluate via auralization? 



A possible strategy leading tests could be testing just one aspect for each test, working on results in order to obtain different "laws" to combine and follow.


TEST1: coupling efficiency

Understanding wheter is better to couple in a simmetric or antisimmetric way two components. Evaluating differencies via auralization in comparison.


TEST 2: angle efficiency

Understanding if an angle enhances perception of scattered wawes. By making 4 trials, obtaining different auralizations to evaluate and compare in order to make a mathematic law (interpolating?). NB: concave angles only!


TEST 3: number efficiency

Do many components strenghten their own effect togheter and how?


T4: height efficiency

Does height affect the scattering perception?


Once found a law for each of these four possibilities, it will be possible to combine a number of components in order to simulate the real configuration od ComponenteDevoto to be produced.


In order to make acoustic tests more effective, eng. Serafino Di Rosaio suggested NOT TO MAKE TESTS ON A SINGLE COMPONENT, BUT ON THE WHOLE SYSTEM (rpg+sitting).

I've therefore produced a couple of possible models of the sitting. It won't be easy prototyping them, since it will be necessary the use of a CNC milling machine.

These consideration about antropometric led the whole 3d modeling process. The sitting is basically a sweeped loft, controlled by its sections (these ones_can be even more).

This "resolution" is, according to me, good for prorotyping, while it will be necessary to detail it and understad how to build it once the final model will be produced.  All the models have a top, which is a single piece containing rpgs; i've not modeled it for better explaining the acoustic nature of these possibilities.

Here it is a couple of exaples. the modeling process has departed from acoustic considerations.


Model 1: CONCAVE-CONVEX This configuration led to the use of sat-down sittings.

 Model 2: SMOOTH SHELL can use both sat-down and lean-against sittings. It could be an interesting model to produce in the very end (since contains all the possibilities for this design).

Model 3: STRAIGHT ANGLE parametrically modular


you need to work more on the bottom part
right now, in order to get some configurations
to be tested. Sending you a picture about the
"leaning part"":

waiting for new "architectonic" pictures.

talk soon on line,


combining 4 modules, suitable for a live music club


there is a seating project by Abalos&Herreros that uses modules
able to be combined. The aesthetic is not satisfying but it
might help you somehow. It's called the XURRET system.

here is an image

The digital patterning and digital fabrication procedure
has been implemented by office ReD, for spanish company ESCOFET

it's casted concrete.
(da prendere con le molle, ovviamente)