Acoustic intensity measurement error for complex sources

Measurement of complex acoustic intensity in an acoustic waveguide.

Acoustic intensity is normally treated as a real quantity, but in recent years, many articles have appeared in which intensity is treated as a complex quantity where the real (active) part is related to local mean energy flow and the imaginary (reactive) part to local oscillatory transport of energy. This offers the potential to recover additional information about a sound field and then to rel...

Safety standards and measurement techniques for high intensity light sources.

Bias error analysis for phase and amplitude gradient estimation of acoustic intensity and specific acoustic impedance.

Sound intensity measurements using two microphones have traditionally been processed using a cross-spectral method with inherent error in the finite-sum and finite-difference formulas. The phase and amplitude gradient estimator method (PAGE) has been seen experimentally to extend the bandwidth of broadband active intensity estimates by an order of magnitude. To provide an analytical foundation ...

TESTING FOR AUTOCORRELATION IN UNEQUALLY REPLICATED FUNCTIONAL MEASUREMENT ERROR MODELS

In the ordinary linear models, regressing the residuals against lagged values has been suggested as an approach to test the hypothesis of zero autocorrelation among residuals. In this paper we extend these results to the both equally and unequally replicated functionally measurement error models. We consider the equally and unequally replicated cases separately, because in the first case the re...

Application of Acoustic Intensity Measurement and Operating Modal Analysis

In this paper, it is described that acoustic intensity of a rail load machine was measured for decreasing the operating noise. To locate exactly the noise sources on the machine, Operational modal measurement and analysis was performed. Comparing the results of analysis the both sets of data measured, the main components of emission noise were determined. Further, improving design of the machin...