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Silvia, Cut Suciatina - One of the best experts on this subject based on the ideXlab platform.
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The Effect of Bridge Piers on Local Scouring at Alue Buloh Bridge Nagan Raya Regency
2021Co-Authors: Silvia, Cut Suciatina, Ikhsan Muhammad, Azwanda AzwandaAbstract:Scouring that occurs in cross-section a river can be caused by morphological conditions of the river and the effect of bridge piers that obstruct the Flow. Availability of piers and abutments can cause the stability of soil base granules to be disrupted, downFlow, and horseshoe vortex that causes soil base granules around the bridge pier to be transported the Flow that causes occurrence in local scouring. The problems of local scours also occurred in Krueng Ineng river, Alue Buloh Village, Nagan Raya Regency. The problem that is often encountered due to bridges being built across rivers is the lack of functioning of the under-bridge structures. Local scours on the bridge piers will cause a structural collapse which has the impact of decreasing the stability of the bridge structure currently. In this study, local scour analysis are using empirical equations with the Froehlich, Lacey and Colorado State University Method. The Results of the analysis with used the peak discharge (Qp100) that occurs in the Krueng Seunagan watershed is 1513m3/sec. Analysis with a Flow depth of 3.06m, Froude number 0.29, pier width with lenticular shaped 4m, and D50, D95 (average grain size analysis ) 0.91mm and 4.35mm, show a maximum scour depth at the field of 1.65m and 1.68m occurs in point (station) 2 and 3 on segment 5. Analysis with the Froehlich, Lacey Method and the CSU Method shows a scour depth is 1.68m, 4,47m (Qp100) and 2.43m. The closest measurement result in the field is the Froehlich Method. With this result, it might be input for local governments to plan appropriate handling for minimizing local scour in this study are
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Effect Of Bridge Piers On Local Scouring At Alue Buloh Bridge Nagan Raya Regency
2020Co-Authors: Silvia, Cut SuciatinaAbstract:Scouring that occurs in cross-section a river can be caused by morphological conditions of the river and the effect of bridge piers that obstruct the Flow. Availability of piers and abutments can cause the stability of soil base granules to be disrupted, downFlow, and horseshoe vortex that causes soil base granules around the bridge pier to be transported the Flow that causes occurrence in local scouring. The problems of local scours also occurred in Krueng Ineng river, Alue Buloh Village, Nagan Raya Regency. Local scours on the bridge piers will cause a structural collapse which has the impact of decreasing the stability of the bridge structure currently. In this study, local scour analysis are using empirical equations with the Froehlich, Lacey and Colorado State University Method. The Results of the analysis with used the peak discharge (Qp100) that occurs in the Krueng Seunagan watershed is 1513m3/sec. Analysis with a Flow depth of 3.06m, Froude number 0.29, pier width with lenticular shaped 4m, and D50, D95 (average grain size analysis ) 0.91mm and 4.35mm, show a maximum scour depth at the field of 1.65m and 1.68m occurs in point (station) 2 and 3 on segment 5. Analysis with the Froehlich, Lacey Method and the CSU Method shows a scour depth is 1.68m, 4,47m (Qp100) and 2.43m. The closest measurement result in the field is the Froehlich Method. With this result, it will be input for local governments to plan appropriate handling for minimizing local scour in this study area
Azwanda Azwanda - One of the best experts on this subject based on the ideXlab platform.
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The Effect of Bridge Piers on Local Scouring at Alue Buloh Bridge Nagan Raya Regency
2021Co-Authors: Silvia, Cut Suciatina, Ikhsan Muhammad, Azwanda AzwandaAbstract:Scouring that occurs in cross-section a river can be caused by morphological conditions of the river and the effect of bridge piers that obstruct the Flow. Availability of piers and abutments can cause the stability of soil base granules to be disrupted, downFlow, and horseshoe vortex that causes soil base granules around the bridge pier to be transported the Flow that causes occurrence in local scouring. The problems of local scours also occurred in Krueng Ineng river, Alue Buloh Village, Nagan Raya Regency. The problem that is often encountered due to bridges being built across rivers is the lack of functioning of the under-bridge structures. Local scours on the bridge piers will cause a structural collapse which has the impact of decreasing the stability of the bridge structure currently. In this study, local scour analysis are using empirical equations with the Froehlich, Lacey and Colorado State University Method. The Results of the analysis with used the peak discharge (Qp100) that occurs in the Krueng Seunagan watershed is 1513m3/sec. Analysis with a Flow depth of 3.06m, Froude number 0.29, pier width with lenticular shaped 4m, and D50, D95 (average grain size analysis ) 0.91mm and 4.35mm, show a maximum scour depth at the field of 1.65m and 1.68m occurs in point (station) 2 and 3 on segment 5. Analysis with the Froehlich, Lacey Method and the CSU Method shows a scour depth is 1.68m, 4,47m (Qp100) and 2.43m. The closest measurement result in the field is the Froehlich Method. With this result, it might be input for local governments to plan appropriate handling for minimizing local scour in this study are
Changcheng Huang - One of the best experts on this subject based on the ideXlab platform.
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analytical models of Flow Availability in two layer networks with dedicated path protection
2013Co-Authors: Changcheng Huang, Michel SavoieAbstract:Abstract Even with protection, user traffic Flows can be disrupted due to network failures that are beyond the protection capability. One of the quantitative metrics to measure the service quality in such a context is “Availability”. We study analytical models that compute Availability of upper-layer Flows in two-layer networks with dedicated path protection at either the upper or the lower layer. Our investigations reveal that existing analytical models significantly overestimate Availability requirements on lower-layer links, and exaggerate upper-layer Flow unAvailability by treating correlated upper-layer failures as being independent. In contrast, our proposed model takes into account such correlations by tracing upper-layer failures to lower-layer root causes, thus greatly relaxing unnecessary high-Availability requirements on lower-layer links without compromising the Availability of upper-layer Flows. In our simulation examples, using the existing models, up to 66.6% and 89.2% of the total Flows are overestimated on their unAvailability under dedicated path protection at the upper and the lower layer, respectively. Moreover, the average unAvailability redundancy built into these Flows is about 30% and 15% for protection at the upper and the lower layer, respectively. Furthermore, we compare Flow Availability under the two protection schemes, and show that given the same initial unprotected network states, protection at the lower layer enjoys lower average Flow unAvailability than protection at the upper layer.
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Flow Availability in two-layer networks with dedicated path protection
2012Co-Authors: Jing Wu, Wenda Ni, Changcheng HuangAbstract:Traffic Flows with protection can be disrupted in network failures that are beyond the protection capability. We analyze Availability of upper-layer Flows in two-layer networks with dedicated path protection at upper or lower layer.
Ujjwal K Saha - One of the best experts on this subject based on the ideXlab platform.
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thermodynamic analysis of a variable compression ratio diesel engine running with palm oil methyl ester
2013Co-Authors: Biplab Kumar Debnath, Niranjan Sahoo, Ujjwal K SahaAbstract:Abstract The present work is set to explore the effect of compression ratio (CR) and injection timing (IT) on energy and exergy potential of a palm oil methyl ester (POME) run diesel engine. Experiments are carried out in a single cylinder, direct injection, water cooled variable compression ratio diesel engine at a constant peed of 1500 rpm under a full load of 4.24 bar brake mean effective pressure (BMEP). The study involves four different CRs of 16, 17, 17.5 and 18; and three different ITs of 20°, 23° and 28°BTDC. Here, the CR of 17.5 and IT of 23°BTDC are the standard ones. The energy analysis performed for the experimental data includes shaft power, energy input through fuel, output by cooling water and exhaust, uncounted loss per unit time. Side by side, the effects of varying CR and IT on peak pressure, peak heat release rate, brake thermal efficiency and exhaust gas temperature are also studied. The exergy analysis is carried out for Availability input, shaft, cooling water and exhaust Availability, Availability destruction and entropy generation. It shows that higher values of CR increase the shaft Availability and cooling water Availability, however, they decrease the exhaust Flow Availability. The retardation and advancement of IT give similar results. The exergy analysis also shows that with the increase of CR, the injection retardation and advancement increase the shaft Availability and exergy efficiency, while it reduces the exergy destruction. The entropy generation is also reduced for the similar CR and IT modifications.
Michel Savoie - One of the best experts on this subject based on the ideXlab platform.
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analytical models of Flow Availability in two layer networks with dedicated path protection
2013Co-Authors: Changcheng Huang, Michel SavoieAbstract:Abstract Even with protection, user traffic Flows can be disrupted due to network failures that are beyond the protection capability. One of the quantitative metrics to measure the service quality in such a context is “Availability”. We study analytical models that compute Availability of upper-layer Flows in two-layer networks with dedicated path protection at either the upper or the lower layer. Our investigations reveal that existing analytical models significantly overestimate Availability requirements on lower-layer links, and exaggerate upper-layer Flow unAvailability by treating correlated upper-layer failures as being independent. In contrast, our proposed model takes into account such correlations by tracing upper-layer failures to lower-layer root causes, thus greatly relaxing unnecessary high-Availability requirements on lower-layer links without compromising the Availability of upper-layer Flows. In our simulation examples, using the existing models, up to 66.6% and 89.2% of the total Flows are overestimated on their unAvailability under dedicated path protection at the upper and the lower layer, respectively. Moreover, the average unAvailability redundancy built into these Flows is about 30% and 15% for protection at the upper and the lower layer, respectively. Furthermore, we compare Flow Availability under the two protection schemes, and show that given the same initial unprotected network states, protection at the lower layer enjoys lower average Flow unAvailability than protection at the upper layer.