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Natural Science Forum / Physics / Acoustics / April 2005Is There Even A Monograph?
Does anyone know of a good book or article on Tonpilz transducer design? If I have a Terfenol-D rod 1.5" long, it will probably have a resonant frequency somewhere around 60 kHz but I want to drop it down to 15-18 kHz and I'd like some way to know how much mass to attach to it (front or back) needed to drop the frequency. To much of design work seems to be either hit or miss experimentation or something akin to black magic. ;-) Ron "You see me now a veteran, of a thousand psychic wars. I've been living on the edge so long where the winds of limbo roar." > Does anyone know of a good book or article on Tonpilz transducer design? > If I have a Terfenol-D rod 1.5" long, it will probably have a resonant [quoted text clipped - 9 lines] > "You see me now a veteran, of a thousand psychic wars. > I've been living on the edge so long where the winds of limbo roar." "Introduction to Theory and Design of Sonar Transducers" by O.B. Wilson, Peninsula Publishing, Los Altos, California may be of some use (see Chapter 6). A quick search of JASA yields 7 hits before 1996. Among them: "The Design of Tonpliz piezoelectric transducers using nonlinear goal programming", McCammon and Thompson, J Acoust. Soc. Am. 68(3) Sept 1980. I haven't looked at the others. I assume you tried Google. I got 194 hits on "TonPilz", some of which look interesting and may be applicable to your problem (e.g. http://www.mecheng.ohio-state.edu/~dapino/SPIE_5049-24_final_numbered.pdf). Good luck! Bruce > > Does anyone know of a good book or article on Tonpilz transducer design? > > If I have a Terfenol-D rod 1.5" long, it will probably have a resonant [quoted text clipped - 18 lines] > McCammon and Thompson, J Acoust. Soc. Am. 68(3) Sept 1980. I haven't looked > at the others. Thanks, but that's probably a non-resoure for me as those articles are usually for registered members and/or cost an arm and a leg for reprints if they're available at all. > I assume you tried Google. I got 194 hits on "TonPilz", some of which look > interesting and may be applicable to your problem (e.g. http://www.mecheng.ohio-state.edu/~dapino/SPIE_5049-24_final_numbered.pd f). Sure, but there is where the problem lies: you can get 139 articles on currently existing transducers, a few articles that only mention them, some that mention them in conjunction with piezo-ceramic elements, and none at all talk about the what goes into designing them. But the book seems promising, thanks. > Does anyone know of a good book or article on Tonpilz transducer design? > If I have a Terfenol-D rod 1.5" long, it will probably have a resonant [quoted text clipped - 4 lines] > To much of design work seems to be either hit or miss experimentation or > something akin to black magic. ;-) The situation is not quite as bad as you suggest, but your general impression is correct. Given your objective, a trial and error approach is the easiest and most efficient. The simplest conceptual model is that the mass at each end ofthe rod forms a resonant system involving the stiffness of the Terfenol-D connecting rod. I recommend that you start with equal mass attached to each end and that you increase each of the attached masses as necessary to get the desired system resonant frequency. As a starting point, you could calculate the stiffness of the rod using Youngs modulus, and then calculate the required effective mass (M1*M2)/(M1+M2)from the standard formula for the resonant freuqency of a mass-spring system. That should get you with 20% of the target frequency. From there you will simply have to itterate. > > Does anyone know of a good book or article on Tonpilz transducer design? > > If I have a Terfenol-D rod 1.5" long, it will probably have a resonant [quoted text clipped - 17 lines] > mass-spring system. That should get you with 20% of the target frequency. > From there you will simply have to itterate. Thanks for the tip. :-) Ron |
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