Accession Number : AD0693635

Title :   AN EXPERIMENTAL INVESTIGATION OF FINITE-AMPLITUDE OSCILLATIONS IN A CLOSED TUBE AT RESONANCE.

Descriptive Note : Scientific interim rept.,

Corporate Author : ROCHESTER UNIV N Y ACOUSTICAL PHYSICS LAB

Personal Author(s) : Cruikshank,Donald B. , Jr

Report Date : 31 JUL 1969

Pagination or Media Count : 143

Abstract : An experimental study of the theoretical analysis given by W. Chester to predict the pressure waveforms generated by a piston in a closed acoustic resonance tube is described. Chester's waveform predictions are summarized. It is shown that a high piston displacement amplitude is required to establish an experimental condition consistent with the approximations of Chester's analysis. Comparisons between theory and experiment are made at the resonance frequency and at two frequencies bracketing resonance for three successively higher piston displacement amplitudes. Although better agreement is expected as the amplitude increases, this increasing agreement is observed only at the frequency above resonance, and not at the resonance frequency or below. However, good qualitative agreement between the shapes of experimental and theoretical waveforms is found at high piston displacement amplitude. The pressure response curve of the experimental system is shown to be asymmetric. On the basis of this experimental observation, a qualitative argument is presented to explain the disagreement between theory and experiment. It is concluded that Chester's theory is qualitatively good at high amplitudes but deficient in detail because it apparently does not account for the amplitude effect of the skewed response curve. (Author)

Descriptors :   (*PIPES, *SOUND), SHOCK WAVES, RESONANCE, PISTONS, PRESSURE, THESES

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE