Volume determination using acoustic resonance

Rothman, Neil S.

doi:10.1121/1.2027051

Cited by 1 publication

(2 citation statements)

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“…In ( 14) and ( 15) displayed the output [] a yn and its spectrum. Frequency response of the acoustic silo system could be obtained by dividing the ( 13) with (15), resulting in (16).…”

Section: Silo Acoustical System and Indentification Of Its Frequency ...mentioning

confidence: 99%

“…With theoritical knowledge that standing wave in pipe or air cavity inside a cylindrical tube of rigidwall, natural frequencies and mode numbers are directly related to volume or length of the cavity [1,14,15]. By assuming that an acoustical system of the air cavity in the cylindrical silo is linear time-invariant (LTI), it is very possible to perform system identification in frequency domain or measure the system frequency response [16]. Resonance frequencies and wave mode numbers may, then, be extracted from the frequency response and used for estimation of bulk material volumes remaining in the silo.…”

Section: Introductionmentioning

confidence: 99%

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Measurement of material volumes in a cylindrical silo using acoustic wave and resonance frequency analysis

Sodsri

2020

Bulletin EEI

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This work presents an approach for measuring material volumes in a closed cylindrical silo by using acoustic waves and resonance frequency analysis of silo’s acoustic systems. With an assumption that the acoustical systems were linear and time-invariant, frequency responses of the systems were identified via measurement. A sine sweep was generated, amplified and fed to a loudspeaker inside the silo. Acoustic waves were picked up by a microphone and processed to yield the silo's frequency response. Resonance frequencies and wave mode numbers of standing waves in the frequency range below 900 Hz were analyzed and used for calculation of air-cavity lengths. With known silo's dimension, the material volume estimations were achieved. Sets of experiments for estimating volumes of sand, cement, water, rice grain, and stone flakes in a closed silo, were done. It was found that the approach could successfully estimate the volumes of sand, cement, and water with a satisfactory accuracy. Percent errors of the estimations were less than 3% from the actual volumes. However, the approach could not estimate the volume of rice grain and stone flakes, since their sound refractions were neither resulted in standing waves nor acoustical modes in the silo.

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“…In ( 14) and ( 15) displayed the output [] a yn and its spectrum. Frequency response of the acoustic silo system could be obtained by dividing the ( 13) with (15), resulting in (16).…”

Section: Silo Acoustical System and Indentification Of Its Frequency ...mentioning

confidence: 99%