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.

1_MockUp

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.

2_Tests

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? 

3_Strategy

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.