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Ear Canal Coupler Model question

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Has anywone worked with model

ear canal ' models.aco.generic_711_coupler?

when assigning the normal acceleration "an" in the input of the coupler, what is the criteria for adding this instead of a sound source, say a source point...

What in earth is d0?, in page 4 of the pdf. to compute this normal acceleration. It referes to a sound source displacement? is the source moving? why this distance? is it not supposed to be an stationary suorce.

Also, how do you know what variables are contained in the physics module "ta" for Thermoacoustics, how do I know you can use ta.iomega for example?

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