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Jurnal Ilmiah Dinamika Rekayasa (DINAREK)
Published by Universitas Jenderal Soedirman
ISSN : 18583075     EISSN : 25276131     DOI : -
Core Subject : Engineering,
Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering
DINAREK is a scientific journal published by Engineering Departement of Jenderal Soedirman University. DINAREK is a peer reviewed nasional journal in Indonesian, published two issues per year (February and August). DINAREK is to publish high-quality articles dedicated to all aspects of the latest outstanding developments in the field of engineering. Its scope encompasses the engineering of signal processing, electrical (power), electronics, instrumentation & control, telecommunication, Geological Engineering, Civil Engineering, Computing and informatics, and Industrial Engineering.
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Articles 6 Documents
 1 
Search results for , issue "Vol 4, No 2 (2008): Dinamika Rekayasa - Agustus 2008" : 6 Documents clear
Abu Terbang (Fly Ash) Sebagai Bahan Tambah Untuk Meningkatkan Kuat Tekan Bata Beton (Paving Block) Gathot Heri Sudibyo; Yanuar Haryanto; Fatkhurrozak Fatkhurrozak
Dinamika Rekayasa Vol 4, No 2 (2008): Dinamika Rekayasa - Agustus 2008
Publisher : Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.dr.2008.4.2.115

Abstract

This research was aimed to know the influence of fly ash addition at paving block stress strength. Variation of fly ash was 0%, 20%, 40%, 60%, and 80% from weight of cement with water cement ratio 0,25. The speciment was hexagonal and cube with the comparison 1 cement : 6 sand. The result showed that the stress strength of hexagonal paving block at 56 days with fly ash 20%, 40%, 60% and 80% was increase to 37,166% (7,057 MPa), 18,248% (3,465 MPa), 8.110% (1,54 MPa), and 14,193% (2,695 MPa). The cubic paving block at 56 days with fly ash 20%, 40%, 60% and 80% was increase to 35,932% (5,969 MPa),15,135% (2,514 MPa), 9,534% (1,584 MPa), and 8,318% (1,382 MPa).
Simulasi Penerapan Mikrokontroller At89c51 Dalam Proses Penyortiran Balok Kayu Berdasarkan Kriteria Panjang Dan Ketebalan Arief Hendra Saptadi; Vita Nurdinawati
Dinamika Rekayasa Vol 4, No 2 (2008): Dinamika Rekayasa - Agustus 2008
Publisher : Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.dr.2008.4.2.116

Abstract

The main problem on sorting out the wood logs in traditional wood industry was that the process should be done manually. Hence, it required an automated system to perform sorting process with a higher precision level. The purpose of this research was to create a simulation of automated wood log sorting process based on specified length and thickness. The sorting system consisted of AT89C51 microcontroller system, keypad (in order to enter the required value of length and thickness), LCD (in order to display the result of sorting process), conveyor belt, two pairs of light sensor (consisting of photodiode and LED, each), and three DC motors which were driven by five relay circuits. At the beginning of sorting process, an operator was to type the selection range (i.e. the minimum and maximum value of required length and thickness) via the keypad provided. The wood log mounted on conveyor belt would be measured by light sensors to determine the value of length and thickness. Based on the values, AT89C51 microcontroller system would then compare them to the selection range. If the log being sorted out fulfilled the requirements, it would be directed to "Accepted" compartment, or else to "Rejected" one. From the test performed, it was concluded that the length measurement was more precise for short logs. While the error rate was much higher for thin logs on thickness measurement. The process of sorting out and counting the wood logs was performed successfully. The system could use the narrowing mechanism at the mounting part of conveyor belt and better supporting ace on thickness sensor, in order to minimize the error rate on length and thickness measurement, respectively. In addition, the system could be developed to measure the volume of an object, providing that the object being measured was having a square or full-circle cross-sectional area.
Penentuan Kapasitas Daya Reaktif Dan Frekuensi Tuning Filter Pasif Untuk Mengurangi Kandungan Arus Harmonik Beban Prasetijo, Hari
Dinamika Rekayasa Vol 4, No 2 (2008): Dinamika Rekayasa - Agustus 2008
Publisher : Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.dr.2008.4.2.117

Abstract

This studi involve decresing method of harmonic current content in a radial distribution systems used single tuned passive filter. The distribution systems model consist of transformer 20/0,4 kV supplying groups of non linier loads that is represented by personal computer (PC) and fluorescent lamp 2x40 W as load harmonic current source. Passive filter was installed in PCC bus (0,4 kV) and analysis to be conducted according to IEEE std.1531-2003 and IEEE std. 519-1992. The reesult showed that insalation passive filter in PCC bus will decrease magnitut load harmonic current significantly. The decreasing determined by reactive power capacity and frequency tunning of passive filter.
Variasi Komposisi Kerapatan Partikel Dan Jumlah Perekat Terhadap Karakteristik Papan Komposit Limbah Kayu Aren – Serbuk Gergaji Nor Intang Setyo H.; Gathot Heri Sudibyo
Dinamika Rekayasa Vol 4, No 2 (2008): Dinamika Rekayasa - Agustus 2008
Publisher : Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.dr.2008.4.2.119

Abstract

Tujuan dari penelitian ini untuk memanfaatkan limbah kulit kayu pohon aren dari sisa buangan industri tepung aren sebagai finir pada lapisan papan partikel sehingga diperoleh papan komposit yang berkualitas. Panel papan komposit dibuat dari papan partikel dari serbuk gergaji kayu sengon dilapisi finir aren (tabal 5mm) melalui jalur pengempaan panas mengunakan perekat urea formaldehida (UF) jenis UA-140L. Papan komposit dibuat dengan variasi jumlah partikel 0,6 ; 0,8; dan 1,0 g/cm3 dengan variasi jumlah perekat 10%, 15%, dan 20%. Untuk pelapisan finir pada papan partikel menjadi papan komposit menggunakan jumlah perekat terlabur 50 MDGL. Parameter pengujian penelitian ini adalah sifat físika (kerapatan, kadar air, penyerapan air, pengembangan tabal, dan penyusutan) dan sifat mekanika (MOR, MOE, tekan, dan tarik geser). Hasil penelitian menunjukkan bahwa faktor jumlah perekat dan jumlah serbuk menentukan dan berpengaruh terhadap sifat físika dan mekanika papan komposit. Semakin banyak jumlah perekat akan menaikkan kualitas papan komposit. Diperoleh mutu papan yang paling baik dengan variasi kompoisi jumlah perekat 20% dan kerapatan partikel 1,0 gram/cm3. Upaya pemakaian limbah kulit kayu aren sebagai lapisan finir pada papan partikel disamping dapat meningkatkan kualitas papan secara mekanika juga secara fisika, yaitu tekstur permukaan yang indah. Berdasarkan standar industri, bahwa papan komposit yang dihasilkan dalam penelitian ini masih memenuhi syarat secara fisika dan mekanika.
Deformasi Vertikal Dan Horisontal Pada Tanah Lunak Di Bawah Trial Embankment Di Kendal, Kaliwungu, Semarang Patria, Adhe Noor
Dinamika Rekayasa Vol 4, No 2 (2008): Dinamika Rekayasa - Agustus 2008
Publisher : Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.dr.2008.4.2.113

Abstract

Soft soil as foundation soil always became problems related to constructions those were constructed on it. The understanding of physical and mechanical properties of soft soil were important for understanding the behaviour of this soil due to vertical loading. One of types of vertical loading was trial embankment.The analysis for vertical and horizontal deformation in soft soil carried out by comparing between the data resulted from field measurement and from numerical simulation. Numerical simulation carried out by using Plaxis version 7.0. In this simulation, soft soil and embankment soil were modelled in Mohr-Coulomb model material. The results of the analysis showed that there was an increasement in soft soil shear strength. This condition led to the decreasement in horizontal deformation. The extreme difference in horizontal deformation between field measurement and numerical simulaton caused by the difference assumption used in soil modeling. For instance modulus of elasticity assumption, soil homogeneity assumption, and fixed condition at the bottom edge of inclinometer. Maximum vertical deformation in soft soil occurred under the center of trial embankment. It happened because the highest compression occurred in this area when the maximum height of embankment reached. This condition led to highest burden supported by the soil under the center of trial embankment.
Perubahan Iklim Kala Pliosen – Plistosen Daerah Bumiayu Ditinjau Dari Bukti Palinologi Setijadi, Rachmad
Dinamika Rekayasa Vol 4, No 2 (2008): Dinamika Rekayasa - Agustus 2008
Publisher : Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.dr.2008.4.2.114

Abstract

The objective of the research was describing Pliocene-Pleistocene climatic changes in Bumiayu area based on palynology evidence. The applied method in this research was survey. For sediment sampling used surface sampling method. There are two phases in this research which are field and laboratory research. Thirty six analyzed samples took from Kalibiuk and Kaliglagah Formation in Cisaat river, Bumiayu. The relative age in Bumiayu area on Kalibiuk and Kaliglagah Formation is Late Pliocene-Pleistocene mark on last appearance Stenochlaenidites papuanus and followed by eight times climatic changes, which caused the changes of the flora and vegetation.

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