Approximation of the Struve function H1 occurring in impedance calculations.
The problem of the rigid-piston radiator mounted in an infinite baffle has been studied widely for tutorial as well as for practical reasons. The resulting theory is commonly applied to model a loudspeaker in the audio-frequency range. A special function, the Struve function H1 (z), occurs in the expressions for the rigid-piston radiator. This Struve function is not readily available in programs such as Matlab or Mathcad, nor in computer languages such as FORTRAN and C. Therefore a simple and effective approximation of H1 (z) which is valid for all z is developed. Some examples of the application of the Struve function in acoustics are presented.
Aarts
Ronald M
RM
Philips Research Laboratories Eindhoven, Prof. Holstlaan 4, NL-5656 AA Eindhoven, The Netherlands. ronald.m.aarts@philips.com
Janssen
Augustus J E M
AJ