九州大学学術情報リポジトリ Kyushu University Institutional Repository 二輪車のパワーレベル(インドネシアMakassar市に おける測定) フスティム, ムラリア 九州大学大学院人間環境学府空間システム専攻博士後期課程 藤本, 一壽 九州大学大学院人間環境学研究院都市・建築学部門 Hustim, Muralia Department of Architecture, Graduate School of Human-Environment Studies, Kyushu University Fujimoto, Kazutoshi Department of Architecture and Urban Design, Faculty of Human-Environment Studies, Kyushu University https://doi.org/10.15017/26773 出版情報:都市・建築学研究. 22, pp.91-96, 2012-07-15. 九州大学大学院人間環境学研究院都市・建築 学部門 バージョン:published 権利関係:
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九州大学学術情報リポジトリKyushu University Institutional Repository
二輪車のパワーレベル(インドネシアMakassar市における測定)
フスティム, ムラリア九州大学大学院人間環境学府空間システム専攻博士後期課程
藤本, 一壽九州大学大学院人間環境学研究院都市・建築学部門
Hustim, MuraliaDepartment of Architecture, Graduate School of Human-Environment Studies, Kyushu University
Fujimoto, KazutoshiDepartment of Architecture and Urban Design, Faculty of Human-Environment Studies, KyushuUniversity
The results obtained in 3.2 were compared with the ASJ
RTN-Model 2008 l3J_ Here two traffic conditions; steady and
non-steady traffic flow conditions, were examined in
comparing with the ASJ RTN-Model 2008.
Fig.6 shows the comparisons between the author's result
and the ASJ RTN-Model 2008. In this figures, black curve
shows power level in steady traffic condition in the ASJ
RTN-Model 2008 and dashed curve shows the expansion of
its which is not guaranteed by the ASJ.
It can be found that power level obtained in this paper
follow the trend of steady condition of the ASJ RTN-Model
2008 when the speed .of vehicle is under 40 km/h for
motorcycle.
-94-
110
$ 100 -0 "-"
~ ~ 90
80
70
120
110
,.-.._ 100 co -0 "-"
90
80
10
Motorcyc1e
•
Lw =67.8+17.I Log v r = 0.676
N =290
20 . 30 40 60
V(Km/h)
Fig.4 Relationship between Lw and V
Motorcycle
•
Lw = 6 7. 7 + 1 7 .4 Log v r = 0.987
N=5
100
70 _._~~~~--~~--.~--.-~~~...--~---1,
10 20 30 40
V(Km/h)
60
Fig.5 Relationship between energy-averaged
100
Although the power level of motorcycle in Makassar is
appropriate to that of the ASJ Model when traffic is in steady
condition, it is larger than that ofASJ Model when the speed
of the motorcycle is lower than 30 km/hour. Meanwhile, the
power level of Makassar's motorcycle is below than that
ASJ Model when the speed more than 30 km/hour. This can
be understood by considering that most of motorcycles in
Makassar have about 11 Occ of engine, while 50cc is
dominant in Japan.
As is well known, motorcycle with low engine size
produces small noise when the speed is low, and louder
noise is generated as the speed increase. On the contrary,
motorcycle with high engine size produces high noise even
. the speed is low.
Lastly, the result of the measured Lw is similar to the
value calculated by the ASJ RTN-Model 2008 assuming that
traffic flow is steady, coincides with the consideration in our
previous research work [41.
3.4 Applying the Power Level of Motorcycle to Predict
theRTN
In order to verify the validity of power level of
motorcycle obtained in 3.3, the authors apply the power
level of motorcycle to predict the traffic noise level (LAeq,day).
The RTN prediction is based on the ASJ RTN-Model 2008
under steady traffic condition and actual speed of vehicle (28
km/h) [SJ when the power level obtained in 3 .3 is used for
motorcycle. The comparison between predicted LAeq,day and
measured ones are shown in Fig. 7 and Fig.8.
Fig.7 shows the prediction by using ASJ's power level
of motorcycle (93.1 dB). It was found that the predicted
LAeq,day are smaller than .the measurement ones. The
difference between them is 2.33 dB on average.
Whereas, Fig.8 shows the prediction by using
measured power level of motorcycle (92.8 dB). The result is
generally same with the Fig. 7 although the difference
between them is 2.53 dB on average .
Overall, the prediction results as shown in Fig.7 and
Fig.8 are almost same. This is because although the power
level of motorcycle obtained in this paper is difference with
.the power level by ASJ RTN Model 2008, but. both power
levels are mostly similar at the speed of vehicle 28km/h.
75 -t-~-r-~~r-~-.--~-.,-~~-..-~--.--~--1
0 10 20 30 40 50 60 70 V(Kmlh)
Fig.6 Comparison of measured and caiculated Lw
-95-
85
80 ,--.._ t:C1 '"O '-"
~ 75
""d a (].)
-< 70 • .....:i ""d
(].) !-< ;:::::)
65 VJ ro (].)
:E 60
N =35
55 60 65 70 75 80 85
Predicted LAeq,day (dB)
Fig.7 LAeq,day by ASJ's power level of motorcycle
4. Conclusion
A-weighted sound pressure level emitted from a single
motorcycle running at the actual road in Makassar City was
measured and the power level is examined in order to grasp
the power level of motorcycle more precisely in Makassar
City, Indonesia. The relation between the power level and
the speed was analyzed and compared with the ASJ
RTN-Model 2008.
The results show that the relation between the power
levels and speed correlate significantly to their speeds. The
power level follows the trend of steady condition of the ASJ
RTN-Model 2008 when the speed of vehicle is ·under 40
km/h. This result coincides with our previous work.
Although the power level of motorcycle in Makassar
City is almost same with that presented by the ASJ when the
speed is 28km/h which is an actual speed in Makassar City,
the power level that obtained in this paper is appropriate to
use in Makassar's RTN prediction than that of the ASJ
Model, because of the difference type of engine between
Makassar's motorcycle and Japanese one.
85
80 ,--.._ t:C1 ""d '-"
>-. 75 ro '"O" er (].)
-< 70 • .....:i ""d
(].) !-< ;:::::)
65 VJ ro (].)
:E 60
N=35
55 60 65 70 75 80 85 Predicted LAeq,day (dB)
Fig.8 LAeq,day by measurement power level of motorcycle
References [l] Muralia Hustim, Ken Anai, Kazutoshi Fujimoto, "Survey of
Road Traffic noise in Makassar City in Indonesia: Effect of Horn on Noise Level," ALT Kyushu Chapter Architectural Research Meeting, 2011.
[2] Muralia Hustim, Ken Anai, Kazutoshi Fujimoto, "Survey on road traffic noise in Makassar City, Indonesia," Proceedings of inter-noise 2011, Osaka Japan, September 4-7 2011
[3] Research Committee of Road Traffic Noise in the Acoustical Society of Japan,"Road traffic noise prediction model ASJ RTN-Model 2008,"Acoust. Sci. & Tech. 31 (1 ), pp.2-55 (2010).
[4] Muralia Hustim, Kazutoshi Fujimoto, "Road Traffic Noise under Heterogeneous Traffic Condition in Makassar City, Indonesia," Journal of Habitat Engineering and Design, 4( 1 ), March 2012.
[5] Takumi Asakura, Shinichi Sakamoto, Mafizur Rahman, "Noise measurement in Dhaka city,"Proceedings of the 2010 Autumn Meeting, The Institute of Noise Control ~ngineering ofJapan, pp.15-18 (2010) (in Japanese).
[6] Muralia Hustim, Kazutoshi Fujimoto, "Acoustical Characteristics of Horn Sound of Vehicles," Journal of Architecture and Urban Design, Kyushu University, (21 ), January 2012. .
[7] Muralia Hustim, Kazutoshi Fujimoto, "Power Level of Vehicles in Makassar City, Indonesia" AIJ Kyushu Chapter Architectural Research Meeting, 2012.