Force Versus Distance of a Pneumatic
By Robbie Rhodes
Has anybody any numerical data on how the force of a simple "board" pneumatic varies with the opening? I've derived an equation, but it's fairly complex and I'd sure like to check it with actual measured numbers.
This data is needed to describe the effect of the hammer-lift "Soft Pedal" in a grand piano reproducer. When the hammer rest rail is lifted it cuts the hammer travel distance to one-half. If the pneumatic force were constant that would result in 3 decibels of sound volume reduction. But my ear and microphone indicates its actually more, and the reason is because the available pneumatic force is much less as the device closes.
-- Robbie Rhodes
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(Message sent Thu 21 Mar 1996, 04:49:55 GMT, from time zone GMT-0800.) |
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