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All Journal Journal of the Indonesian Mathematical Society Limits: Journal of Mathematics and Its Applications
Sri Redjeki Pudjaprasetya
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Mathematics

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An Analysis of A Three-Phase Versus A Four-Phase Traffic Lights Regulation for A Four-Leg Intersection Sri Redjeki Pudjaprasetya; Dear Michiko Noor
Journal of the Indonesian Mathematical Society Volume 26 Number 2 (July 2020)
Publisher : IndoMS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22342/jims.26.2.823.192-201

Abstract

Traffic management of intersections is an important factor that can determine traffic density at the intersection, as well as its surrounding. Long traffic queues we encounter in daily life, were often caused by ineffectiveness of traffic lights management of the cross sections.In this article, an analytic study of traffic light management of a four-leg intersection, based on the kinematic LWR model, was presented. Comparison was based on observing the end of queues over three cycles of red-green lights, under the assumption of a constant traffic flux. On every leg of the intersection, the end of the queues were obtained from characteristic lines of the shock waves.From these observations, the three phase regulation was preferred over the four-phase one. Finally, a case study of Taman Sari - Baltos intersection located in Bandung City, Indonesia, was discussed. Parameter values used in these simulations were obtained from direct observation. 
Skema Staggered Grid pada Persamaan Air Dangkal untuk Simulasi Aliran di Sekitar Pulau Nashrul Millah; Sri Redjeki Pudjaprasetya
Limits: Journal of Mathematics and Its Applications Vol 21, No 1 (2024)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/limits.v21i1.14620

Abstract

Wake merupakan suatu pola gelombang pada permukaan air yang muncul akibat adanya pergerakan benda rigid. Pada penelitian ini, skema staggered grid orde dua digunakan untuk menyelesaikan persamaan air dangkal tak linier. Hasil yang didapat digunakan untuk mensimulasikan munculnya riak yang timbul akibat adanya arus yang menabrak pulau berbentuk lingkaran. Pada simulasi ini gaya-gaya luar yang diperhitungkan adalah gangguan angin, gaya gesek dengan dasar, dan efek turbulensi. Simulasi dilakukan dengan meniupkan angin pada ujunga kanal memanjang dengan sebuah pulau di dekat pangkalnya yang memicu aliran air. Untuk bilangan Reynold yang kecil, aliran air bersifat laminar dan membentuk pola halus di sekitar pulau. Bilangan Reynold merupakan perbandingan antara ketaklinieran dengan viskositas air. Untuk simulasi dengan bilangan Reynold yang besar, aliran menjadi tidak stabil dan memicu munculnya riak turbulen. Pusaran air tampak pada riak yang muncul di belakang pulau.
Co-Authors Dear Michiko Mutiara Noor Nashrul Millah