An Integrated Acoustic/Microseismic Approach to Monitoring Low Frequency Noise & Vibration — A Case Study

2003 ◽  
Vol 10 (1) ◽  
pp. 77-95 ◽  
Author(s):  
Ian Rushforth ◽  
Andy Moorhouse ◽  
Peter Styles
Keyword(s):  
Low Frequency ◽  
Frequency Noise ◽  
Industrial Site ◽  
Low Frequency Noise ◽  
Integrated Method ◽  
Source Determination ◽  
Vibration Problems ◽  
Noise Vibration ◽  
Technique Comparison

It is proposed that low frequency noise/vibration problems are best tackled by a combination of acoustic and microseismic methods, rather than using each method in isolation. A new integrated method was devised and it was demonstrated that ‘the whole is greater than the sum of the parts’. The benefits and versatility of the new method are illustrated with reference to a case study. Unmanned monitoring took place at several houses near to an industrial site, using a multi-channel recording technique. Comparison of various components of the sound and vibration fields in each house was then carried out, which allowed various propagation paths to be distinguished. A range of further signal processing analyses was also employed to aid source determination.

scholarly journals A Case Study of Low Frequency Noise Assessed Using DIN 45680 Criteria

2002 ◽  
Vol 21 (4) ◽  
pp. 181-198 ◽  
Author(s):  
Ian Rushforth ◽  
Andy Moorhouse ◽  
Peter Styles
Keyword(s):  
Measurement Techniques ◽  
Low Frequency ◽  
National Standard ◽  
Acoustic Measurement ◽  
Frequency Noise ◽  
Industrial Site ◽  
Low Frequency Noise ◽  
Industrial Estate ◽  
Resultant Data

This paper describes a case study in which low frequency noise was suspected of causing disturbance in a semi-rural location close to an industrial estate. Previous attempts using conventional acoustic measurement techniques to resolve the case, or even prove the existence of a real acoustic problem, had proved unsuccessful. In the present study, the authors applied a novel integrated acoustic/microseismic measurement system, and assessed the resultant data using criteria from the German national standard DIN 45680. Using this approach, the authors successfully resolved the low frequency noise problem and, after a test involving a sequential shutdown at a suspect industrial site, established the precise cause of the disturbance. The paper thus supports the criteria in DIN 45680 as a predictor of annoyance due to low frequency noise and as an aid in resolving such problems. It also illustrates the flexibility of the combined acoustic/microseismic technique and the advantages of the method over conventional techniques.

Advanced acoustical material tuned for low frequency noise reduction: a case study

2008 ◽  
Vol 123 (5) ◽  
pp. 3811-3811
Author(s):  
Kathleen Kondylas ◽  
Natalia Levit ◽  
Joseph A. King ◽  
Chris R. Fuller
Keyword(s):  
Noise Reduction ◽  
Low Frequency ◽  
Frequency Noise ◽  
Low Frequency Noise

scholarly journals On the Control of Low-Frequency Audible Noise from Electrical Substations: A Case Study

2020 ◽  
Vol 10 (2) ◽  
pp. 637 ◽  
Author(s):  
Edoardo Alessio Piana ◽  
Nicolaas Bernardus Roozen
Keyword(s):  
Power Distribution ◽  
Distribution Systems ◽  
Methodological Approach ◽  
Low Frequency ◽  
Mitigation Measures ◽  
Propagation Path ◽  
Frequency Noise ◽  
Subjective Response ◽  
Low Frequency Noise

With the world facing the urgency of energy transition, the development of efficient and quiet electrical infrastructures is of topical importance in the construction of the environment of the future. The problem of noise from power distribution systems is often underestimated, although several works in the literature underline the effect of disturbance on the population, especially concerning the low frequency range. This paper overviews the issue of the low-frequency noise generated by electrical substations, from the experimental characterization of the source to the possible mitigation measures at the source, along the propagation path and at the receiver. Alongside the general presentation, a case study serves as a practical demonstration of the proposed methodological approach. It was found that in the investigated situation the main disturbance comes from the transformer at two low-frequency harmonics of twice the networking frequency. A traditional noise barrier is designed taking into account the strict size constraints imposed by technical compatibility with the electrical infrastructure, which limits its efficacy at low frequency. Noise masking with broadband signals can be a complementary solution to further reduce noise disturbance and contain it within prescribed limits. The evaluation of subjective response of the receivers to different mitigation solutions is made possible by the availability of the impulse response.

scholarly journals Low-frequency noise inδ13C andδ18O tree ring data: A case study ofPinus uncinatain the Spanish Pyrenees

2010 ◽  
Vol 24 (4) ◽  
pp. n/a-n/a ◽  
Author(s):  
Jan Esper ◽  
David C. Frank ◽  
Giovanna Battipaglia ◽  
Ulf Büntgen ◽  
Christopher Holert ◽  
...  
Keyword(s):  
Tree Ring ◽  
Low Frequency ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Tree Ring Data ◽  
Spanish Pyrenees

A Case Study of Low Frequency Noise Assessed Using DIN 45680 Criteria

Noise Notes ◽  
2004 ◽  
Vol 3 (1) ◽  
pp. 3-18 ◽  
Author(s):  
Ian Rushforth ◽  
Andy Moorhouse ◽  
Peter Styles
Keyword(s):  
Low Frequency ◽  
Frequency Noise ◽  
Low Frequency Noise

Original waveform of lung sound crackles: a case study of the effect of high-pass filtration

1991 ◽  
Vol 71 (6) ◽  
pp. 2173-2177 ◽  
Author(s):  
T. Katila ◽  
P. Piirila ◽  
K. Kallio ◽  
E. Paajanen ◽  
T. Rosqvist ◽  
...  
Keyword(s):  
Low Frequency ◽  
Final Analysis ◽  
Sound Signal ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Lung Sound ◽  
High Pass

In lung sound research, low-frequency noise usually disturbs the sound signal being recorded. Some researchers therefore use high-pass filtration before the final analysis. In this study, the effect of digital and analog high-pass filtration on the morphology of the lung sound crackles is evaluated. The original nonprefiltered crackle waveform is presented, and the effect of the high-pass filtration on the crackle waveform characteristics is elucidated in one patient with silicoasbestosis.

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