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by using Smartphone roughness measurement by YAGI, Koichi - - PowerPoint PPT Presentation
by using Smartphone roughness measurement by YAGI, Koichi - - PowerPoint PPT Presentation
Investigation report for roughness changes after HOKKAIDO IBURI earthquake Japan, by using Smartphone roughness measurement by YAGI, Koichi BumpRecorder Co., Ltd. yagi@bumprecorder.com www.bumprecorder.com RPUG-PDRG 1st Joint Meeting Past
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IBURI earthquake 2018 Sep.
100km 100km
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Seismic intensity map
Sapporo Station Atsuma Town Sapporo City Higashi Ward Mukawa Town New Chitose Airport
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RPUG-PDRG 1st Joint Meeting
IBURI earthquake 2019 Feb.
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Research distance up to 1,600km
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Measurement Method and Evaluation Index
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Vibration data is collected under driving situations.
Smartphone type measurement
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IRI Class 2 calculation process
Calculate profile (d) Inverted QC simulation (c) Measure acceleration (a) Suspension estimation (b)
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Using profile, compute indexes
(1) Measured profile (2) QC simulation (3) Calculate IRI
IRI - International Roughness Index JRI - Japanese Roughness Index HEITANSEI sigma 平たん性σ Average of suspension expansion & compression under 80km/h driving
- situation. It includes longer wave
length. Standard deviation of 3m profilometer measurement value. It indicate shorter wave length situation. 3m
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BBI - Boeing Bump Index Pointed information of the bump size and location. 10m straight edge is used, and deepest depth is defined Bump Height.
10m Straight edge
IRI / JRI - Roughness Representative value on the segment.
Bump Height
Using profile, compute indexes
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Measurement Results around Atsuma Town and Mukawa Town
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Measurement result after earthquake
Is this affect from quake? Only current data, judgment is difficult
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Result before and after 2018
This is not affect from quake. Comparison is effective to understand. After earthquake roughness situation draw by red line. Before earthquake draw by blue line.
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Result before and after 2019
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JRI before earthquake
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JRI after earthquake
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BBI before earthquake
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BBI after earthquake
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Bump situation
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Bump situation
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Comparison IRI and JRI
IRI JRI after before
before < after → damage IRI < JRI → shorter wave length damage
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Measurement Results around Sapporo City Higashi Ward
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Measurement result after earthquake
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Result before and after 2018
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Result before and after 2019
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IRI JRI after before
IRI < JRI → shorter wave length damage
Comparison IRI and JRI
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Conclusion
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Conclusion
- By using Smartphone, roughness condition can be
measured quick, easy and wide area, low cost.
- Roughness situation is changed after earthquake.
- Comparison before and after is clearly indicate road
damage.
- IRI, JRI, BBI can indicate road damage, and
sometime their characteristic is not same. Important is
- not only after but also before, collecting data.
- not only IRI but also JRI, BBI also using.
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