Untitled Document

The acoustical impedance tube setup has been fabricated locally from funds provided by a consultancy project from M/s. Mahindra & Mahindra, Nashik. This test setup is based on the ASTM E 1050-98 standard. By using this setup the normal specific sound absorbing coefficient of acoustical materials as a function of frequency can be determined. The impedance tube can also be used to generate plane waves, which can be used to calibrate the microphone pair in a two microphone sound intensity probe. The impedance tube can also be used for basic plane wave acoustical studies in ducts, active noise control studies in ducts. Two such impedance tubes can be used to evaluate the performance of silencers.

	1. ACOUSTICAL IMPEDANCE TUBE (ASTM E-1050)


	The acoustical impedance tube setup has been fabricated locally from funds provided by a consultancy project from M/s. Mahindra & Mahindra, Nashik. This test setup is based on the ASTM E 1050-98 standard. By using this setup the normal specific sound absorbing coefficient of acoustical materials as a function of frequency can be determined. The impedance tube can also be used to generate plane waves, which can be used to calibrate the microphone pair in a two microphone sound intensity probe. The impedance tube can also be used for basic plane wave acoustical studies in ducts, active noise control studies in ducts. Two such impedance tubes can be used to evaluate the performance of silencers.