Buick, J M; Chavez-Sagarnaga, J; Zhong, Z; Ooi, J Y; Pankaj, Pankaj; Campbell, D M; Greated, C A

Author(s)

Buick, J M

Chavez-Sagarnaga, J

Zhong, Z

Ooi, J Y

Pankaj, Pankaj

Campbell, D M

Greated, C A

Publication Date

2005

Abstract

Silo honking is an acoustical emission with a fundamental frequency of several hundred Hertz and an intensity often greater than 100 dB. It occurs when a silo is discharging and is similar to the 'honk' of a lorry horn. The high amplitude of the honk makes it a significant noise pollution issue for workers at the site and for neighboring businesses and residents. This paper considers some possible excitation mechanisms that may be responsible for honking and presents measurements obtained from a full scale honking silo detailing the acoustic emissions and the associated vibration of the silo walls. Experimental results are presented which are comprised of simultaneous measurements of the three components of the wall vibrations and the acoustic pressure. The wall vibrations have an initial impulse response with a high amplitude O(100g) and subsequent oscillatory accelerations with amplitude O(10g). The frequency spectra of the acceleration and acoustic pressure measurements comprises a sharp peak at the fundamental acoustic frequency and a harmonic series of peaks at integer multiples of the fundamental frequency. It is shown that the honking is not generated by a resonance inside the silo, as in a flute or organ pipe; the sound is generated by the silo walls acting as large speakers. The interaction between the wall and the sliding pellets is considered as a possible excitation mechanism for the acoustic emissions. Laboratory friction measurements are presented using pellets from the honking silo and a wall sample. The results of these measurements show that the particles exhibit a slip-stick behavior when sheared against the wall material. This slip-stick behavior is characterized under different conditions for pellets that are known to produce honking. Particles that have not been observed to honk were also tested and did not produce slip-stick motion at the wall.

Citation

Journal of Engineering Mechanics, 131(3), p. 299-307

ISSN

1943-7889

0733-9399

Link

https://hdl.handle.net/1959.11/8507

Publisher

American Society of Civil Engineers (ASCE)

Title

Investigation of Silo Honking: Slip-Stick Excitation and Wall Vibration

Type of document

Journal Article

Entity Type

Publication

Author(s)	Buick, J M Chavez-Sagarnaga, J Zhong, Z Ooi, J Y Pankaj, Pankaj Campbell, D M Greated, C A
Publication Date	2005
Abstract	Silo honking is an acoustical emission with a fundamental frequency of several hundred Hertz and an intensity often greater than 100 dB. It occurs when a silo is discharging and is similar to the 'honk' of a lorry horn. The high amplitude of the honk makes it a significant noise pollution issue for workers at the site and for neighboring businesses and residents. This paper considers some possible excitation mechanisms that may be responsible for honking and presents measurements obtained from a full scale honking silo detailing the acoustic emissions and the associated vibration of the silo walls. Experimental results are presented which are comprised of simultaneous measurements of the three components of the wall vibrations and the acoustic pressure. The wall vibrations have an initial impulse response with a high amplitude O(100g) and subsequent oscillatory accelerations with amplitude O(10g). The frequency spectra of the acceleration and acoustic pressure measurements comprises a sharp peak at the fundamental acoustic frequency and a harmonic series of peaks at integer multiples of the fundamental frequency. It is shown that the honking is not generated by a resonance inside the silo, as in a flute or organ pipe; the sound is generated by the silo walls acting as large speakers. The interaction between the wall and the sliding pellets is considered as a possible excitation mechanism for the acoustic emissions. Laboratory friction measurements are presented using pellets from the honking silo and a wall sample. The results of these measurements show that the particles exhibit a slip-stick behavior when sheared against the wall material. This slip-stick behavior is characterized under different conditions for pellets that are known to produce honking. Particles that have not been observed to honk were also tested and did not produce slip-stick motion at the wall.
Citation	Journal of Engineering Mechanics, 131(3), p. 299-307
ISSN	1943-7889 0733-9399
Link	https://hdl.handle.net/1959.11/8507
Publisher	American Society of Civil Engineers (ASCE)
Title	Investigation of Silo Honking: Slip-Stick Excitation and Wall Vibration
Type of document	Journal Article
Entity Type	Publication

Investigation of Silo Honking: Slip-Stick Excitation and Wall Vibration

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