Measurement of complex acoustic intensity in an acoustic waveguide

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...

Intensity of Acoustic Radiation Measurement on Persian Musical Instruments

A new acoustical parameter, called Intensity of Acoustic Radiation (IAR), was recently defined, and resulted very well related with mechanical vibration of sound source, being able to quantify the sound efficiency of musical Instruments In this paper the IAR was experimentally measured on Persian string musical Instruments. IAR relates mechanical vibration of surface (e.g. soundboards) and soun...

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...

Acoustic Neurinomas

Acoustic neuromas (AN) are schwann cell-derived tumors that commonly arise from the vestibular portion of the eighth cranial nerve also known as vestibular schwannoma(VS) causes unilateral hearing loss, tinnitus, vertigo and unsteadiness. In many cases, the tumor size may remain unchanged for many years following diagnosis, which is typically made by MRI. In the majority of cases the tumor is s...

Waveguide Simulation of Non-Cylindrical Acoustic Tubes