Investigation into acoustic emission of pneumatic cylinders

Augutis, V.; Saunoris, Marius

doi:10.1784/insi.2007.49.8.476

Cited by 2 publications

(2 citation statements)

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“…The conventional beamforming in the frequency domain is basically defined by (5), where B is the beamformer output power, G (for the sake of simplicity the true cross-spectral matrix and its estimate due to the finite length of the measurement sample are not distinguished) represents the cross-spectral matrix (m × m) of the microphone signals, and h is the steering vector (h i = e jωτi ). One has…”

Section: Frequency Domainmentioning

confidence: 99%

“…In the case of structure borne acoustic activity monitoring two examples related to compressed air are given. Augutis and Saunoris [5] investigated the internal leakage in a pneumatic cylinder using ultrasonic acoustics. They found that in the case of worn cylinder leakage between the piston and housing causes a higher intensity of acoustic emissions than in leak-free new cylinder.…”

Section: Introductionmentioning

confidence: 99%

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Microphone Arrays as a Leakage Detection Tool in Industrial Compressed Air Systems

Eret

Meskell

2012

Advances in Acoustics and Vibration

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Compressed air energy is expensive, but common in industrial manufacturing plant. However, a significant part of the generated compressed air energy is lost due to leakage. Best practice requires ongoing leak detection and repair. Leak detection in the ultrasonic frequency range using handheld devices is possible only over short distances as associated high-frequency sound is rapidly attenuated by atmospheric absorption. Pressurized air escaping to ambience also generates frequencies below 20 kHz. In this paper beamforming—a well known method for generating noise maps—is tested as a tool for localization of compressed air leaks at larger distances in the audible frequency range. Advanced beamforming methods in both time domain (broadband) and frequency domain (narrowband) have been implemented in a variety of situations on a laboratory experimental rig with several open blows representing leakage in a noisy environment similar to a factory setting. Based on the results achieved it is concluded that the microphone array approach has the potential to be a robust leak identification tool. The experience gained here can also provide useful guidance to the practitioner.

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Section: Frequency Domainmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%