Gábor Geréb

Real-time source-selective noise monitoring and mappingPhD research workshop

Gábor Geréb

motivation…aim…path

• Finishing the MSc focusing mainly on noise

• 4 years construction noise monitoring of M4

• Practical problems raised:• Monitoring noise sources selectively

• Creating real-time noise map

• Scientific problems raised:• Separation of total noise level by source data

• Time correlation of noise level in receiver points

• PhD research started on scientific problems

• Development started on practical problems

Gábor Geréb

Multi-point

Single point

Time samples

Space samples

Manual noise measurement

Single sampling Real-time sampling

Real-time noise mapStatistical noise map

Real-time source-selectivenoise monitoring

wherefrom…whereto

Gábor Geréb

Source-selective noise monitoring

Sources

Observations Measurement

Selection

Gábor Geréb

benefits

Relevance - Ignore irregular noise events- Filter-out irrelevant sources- Sort noise by source type

Identification - Identify cause of excessive noise- Trigger focused alarms and mitigation actions

Cost-efficiency - Monitor multiple relevant sources for less than the cost of multiple monitoring stations

Noise mapping - Refresh noise map with measured data- Set-up real-time noise map with real-time source-selective noise monitoring

Gábor Geréb

what we can…what we want

• We can• Monitor noise in real-time using instrument

• Identify sound source using computer algorithm

• Calculated noise map using computer model

• We want to• Separate noise level of monitored sources using

computer algorithm

• Refresh noise map using monitoring data

Gábor Geréb

challages

• Justification of theory• Separation of total noise level by source data

• Time correlation of noise level in receiver points

• Accuracy• Modeling of noise propagation on site

• Determination of spacial limitations of mapping

• Reliability• How to cover noise sources with monitoring

• Goodness of source selection decision

Gábor Geréb

theory

If we measure the noise immission of a certain source in separate points of space. The time-function of immission levels will be correlating if the noise propagation can be considered as time-invariant.

rx

ry L

Ls,r1,t2

Ls,r2,t2 ∆Ls,r1,r2

t

L

Ls,r2,t

1

Ls,r2,t2

∆Ls,t1,t

2

∆Ls,t1,t2

∆Ls,r1,r

2

t1

t2

r1

r2

Gábor Geréb

theory

Dominant periods of noise sources are attached to certain physical phenomenon that can be measured and algorithmically processed in order to identify these periods. By identifying dominant sources of a period of time, the resultant noise level can be divided to source immission levels.

monitoring

observation

identification

serparation

Gábor Geréb

alpha prototype

Measurementmicrophone

Measurement

Directionalmicrophone

Directionalmicrophone

Observations

Stereo difference

Frequency spectra

Web-camera

Movement detection

Gábor Geréb

test site

Gábor Geréb

test results

55,0 dBA

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85,0 dBA

90,0 dBA

95,0 dBA

15:25:00 15:26:00 15:27:00 15:28:00 15:29:01 15:30:01 15:31:01 15:32:02 15:33:02 15:34:02 15:35:03 15:36:03 15:37:03 15:38:03 15:39:04 15:40:04 15:41:04 15:42:05 15:43:05 15:44:05

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55,0 dB

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00 05 10 15 20 25 30 35 40 45 50 55 00 05 10 15 20 25 30 35 40 45 50 55

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75%

1-3dB

Gábor Geréb

Geréb Gábor, Molitorisz Péter, Ronan LeRoyOn-line-Überwachnung beim Bau der U-Bahn-Linie U4 in Bp…BAUTECHNIK 84:(6) pp. 422-425. Paper N/A. (2007)Folyóiratcikk/Szakcikk/Tudományos (1 pont)

Geréb Gábor2007: Zajmonitoring szerepe a zajvédelemben.2009: Közlekedési zaj hatástanulmányok Angliában…2010: Valós idejű zajtérkép alkalmazása a környezetvédelemben

Zajvédelmi szemináriumKonferenciacikk/Előadás vagy poszter cikke/Tudományos (0 pont)

Nemzetközi folyóiratcikk előkészítés alatt (6 pont?)

publications

Gábor Geréb

Workout of concept and hypotheses

Feasibility analysis

Realization in laboratory (alpha prototype)

Verification of hypotheses

Production of the prototype

Protection of intelligible rights

Pilot project

Selling the product

Current status of theinnovation

2007

2011

2013

Gábor Geréb

Gábor Geréb acoustician

BME PhD student gerebg@hit.bme.huwww.hit.bme.hu/en

For further information, please do not hesitate to contact me.