Sound Test

We experienced amplification of rolling trains on our fixed layout. Sounds damping material was installed and it reduced the noise. We are building modules of a new design and we asked. Is the material we are currently using the best choice. We collected an assortment of different materials and tried them as underlayment for the road bed. These test stripes eliminated some materials as too cumbersome, to difficult to attach or too expensive.

The following are the test results.

underlayment_sound_tests-20230708

Realize that the baseline curve is a whole lot of noise. The microphone, while usable, isn’t sensitive enough to get the car rolling as the primary thing recorded. It was suggested using viola’s bridge mic against the plywood, but I don’t have the equipment to get it to connect to the laptop (other than having it go into a guitar amp and pointing the laptop’s mic at that). The car is moving (and accelerating) at a good clip by the time that it passes the mic. Those peaks around 2-3kHz are from fast wheel noise – there would be little low end generation.

Log scale on the X axis on new graph.

I collected raw silence (noise) and added it to the graph.

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