NDLI: Optimized shapes of ocsillating resonators for generating high-amplitude pressure waves

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Optimized shapes of ocsillating resonators for generating high-amplitude pressure waves

Content Provider	NASA Technical Reports Server (NTRS)
Author	Li, Xiao-Fan Steinetz, Bruce M. Daniels, Christopher Finkbeiner, Joshua
Copyright Year	2003
Description	It is well known that the resonator geometry strongly influences the resonant frequencies of an acoustical resonator and the generated nonlinear standing pressure waveform. Maximizing the ratio of maximum to minimum gas pressure at an end of an oscillating resonator by optimizing the cavity contour is investigated numerically. A quasi-Newton type scheme is used to find optimized axisymmetric resonator shapes to achieve the maximum pressure compression ratio. The acoustical field is solved using a one-dimensional model, and the resonance frequency shift and hysteresis effects are obtained through an automation scheme based on continuation methods. Results are presented from optimizing cone, horn-cone, and cosine resonator geometries. Significant performance improvement is found in the optimized shapes over others previously published. Different optimized shapes are found when starting with different initial guesses, indicating multiple local extrema. The numerical model is validated by comparing with the experimental results of a horn-cone shaped resonator.
File Size	981374
Page Count	34
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20040053468
Archival Resource Key	ark:/13960/t6d26w78w
Language	English
Publisher Date	2003-12-29
Access Restriction	Open
Subject Keyword	Mechanical Engineering Resonant Frequencies Waveforms Oscillations Mathematical Models Gas Pressure Shapes Resonators Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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