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INDONESIA
TEKNIK
Published by Universitas Diponegoro
ISSN : 08521697     EISSN : 24609919     DOI : -
Core Subject : Engineering,
Engineering
Journal yang mempublikasikan artikel-artikel ilmiah dari berbagai disiplin ilmu rekayasa/keteknikan. Artikel-artikel yang dipublikasikan di Jurnal TEKNIK meliputi hasil-hasil penelitian ilmiah asli (prioritas utama), artikel ulasan ilmiah yang bersifat baru (tidak prioritas), atau komentar atau kritik terhadap tulisan ilmiah yang dipublikasikan oleh Jurnal TEKNIK.
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Articles 10 Documents
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Search results for , issue "Vol 41, No. 3 (2020): December 2020" : 10 Documents clear
Perancangan Desain Portable Fixed-Bed Composite Adsorber Column sebagai Media Pemurnian Biodiesel dengan Sistem Packing Bed Bimantio, Mohammad Prasanto; Oktavianty, Herawati; Widyasaputra, Reza
TEKNIK Vol 41, No. 3 (2020): December 2020
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v41i3.32661

Abstract

Toward Sustainable Preservation of Cultural Heritage Buildings: A Combination of Digital Mapping and Architectural mapping for Omah Pencu in the Historic Area of Kudus Kulon Suprapti, Atik; Sejati, Anang Wahyu; Sardjono, Agung Budi; Pandelaki, Edward E.; Malik, Abdul; Huwaida, Nurma Mediasri
TEKNIK Vol 41, No. 3 (2020): December 2020
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v41i3.27922

Abstract

This study aims to map the existence of the wooden houses of Omah Pencu and classifies their potencies as heritage buildings in the historic area of Kudus Kulon. Caring for indigenous cultural heritage will contribute to the strengthening of local identity. The traditional houses of Omah Pencu have been developing as the specific architecture since the end of the 17'th century, as a living place of the ‘Gusjigang' community, and artifacts evident of the city heyday. However, the pressure of modernization-capitalization in the city caused several changes in their built environment and decreased the number of Omah Pencu. This research concern with the GIS interpretation methods and the direct observations use the questionnaire, interview, and architectural documentation. The findings provide an important database for preservation in the digital era. The digital mapping, combined with the mapping of tangible and intangible buildings, produces digital information about the Omah Pencu building condition that has never been done before. Through this mapping, found that the participation effort of the community caused the sustainability of preservation. It is a very significant bottom-up participation.  However, toward sustainable preservation, a strategy, planning, design, and management that integrated all stakeholders and resources by utilizing digital technology are needed.
Analisis Pengaruh Biodiesel B20 Dan B100 Terhadap Degradasi Viskositas Dan Total Base Number Minyak Pelumas Pada Mesin Diesel Yang Beroperasi Dalam Jangka Panjang Dengan Metode ASTM D2896 Dan ASTM D445-06 Sentanuhady, Jayan; Majid, Akmal Irfan; Prashida, W.; Saputro, W.; Gunawan, N. P.; Raditya, T. Y.; Muflikhun, Muhammad Akhsin
TEKNIK Vol 41, No. 3 (2020): December 2020
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v41i3.32515

Abstract

Based on its characteristics, biodiesel has a higher density, viscosity, and acidity level than diesel fuel, so it has a disadvantages in terms of lubricants especially in the long run. The impact, it can decrease the kinematic viscosity of the lubricant, a decrease in the total base number, and the impact by decreased of the engine performance. This research aims to determine the characteristics of lubricants from the use of biodiesel (B20 and B100) related to the kinematic viscosity of lubricants and Total Base Number (TBN). The testing method were used ASTM D2896-15 and ASTM D445-06 standard. The study used two units Kubota RD 65 DI-NB diesel engines with a cylinder volume of 376 cc. The rotary speed of the machine was keep constant at 2200 rpm and were operated for 300 hours non-stop. Moreover, the sampled was carried out every multiple of 100 hours. Based on the research results, the quality of lubricants with B100 fuel is no better than lubricants with B20 fuel. B100-fueled lubricants have kinematic viscosity values at temperatures of 40 °C and 100 °C and has lower TBN values than B20-fueled lubricants.
Perbaikan Rugi-Rugi Daya Listrik Menggunakan Kapasitor Bank dan Tap Pengubah Sadapan Dengan Algoritma Shark Smell Sumarno, Radiktyo Nindyo; Handoko, Susatyo; Facta, Mochammad
TEKNIK Vol 41, No. 3 (2020): December 2020
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v41i3.24818

Abstract

Salah satu cara mengoptimalkan saluran transmisi adalah dengan mengurangi rugi-rugi daya listrik. Tap pengubah sadapan pada transformator daya dan kapasitor bank dapat digunakan untuk mengatur tegangan sistem yang berakibat menurunkan rugi-rugi daya di saluran transmisi. Penentuan nilai tap setting dan kapasitor bank dalam proses perencanaan sulit dilakukan secara pasti sehingga umumnya dilakukan melalui mekanisme trial dan error menggunakan metoda aliran daya. Karena penentuan nilai tap setting dan kapasitor bank yang sulit dilakukan secara pasti, maka pada penelitian ini dilakukan optimasi dengan algoritma shark smell yang bertujuan untuk mendapatkan nilai pengubah sadapan dan kapasitor bank yang lebih tepat pada sistem IEEE 30-bus. Pada penelitian ini dilakukan beberapa optimasi yaitu optimasi tap setting, optimasi kapasitor bank, dan optimasi tap setting yang dikombinasikan dengan optimasi kapasitor bank. Pada kondisi optimasi tap setting, diperoleh pengurangan rugi-rugi daya aktif sebesar 0,65% dari kondisi tanpa optimasi. Pada optimasi kapasitor bank,diperoleh pengurangan rugi-rugi daya aktif sebesar 0,90% dibandingkan kondisi tanpa optimasi. Pada optimasi kombinasi tap setting dan kapasitor bank diperoleh pengurangan rugi-rugi daya aktif sebesar 1,23%. Perbandingan hasil dari semua optimasi tersebut didapatkan hasil bahwa kombinasi optimasi tap setting dan kapasitor bank diperoleh pengurangan rugi-rugi daya aktif paling besar. Pada penelitian ini dihasilkan pengurangan rugi-rugi daya aktif sebesar 217,2 kW. Berdasarkan nilai pengujian, didapatkan hasil bahwa algoritma Shark Smell dapat memberikan hasil optimasi yang lebih baik 1,23% dibandingkan kondisi tanpa optimasi
Analysis of Particulates and SO2 Removal from Coal Combustion Emissions Using Cyclone and Wet Scrubber With Textile Wastewater Feed Huboyo, Haryono S.; Sudarno, Sudarno
TEKNIK Vol 41, No. 3 (2020): December 2020
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v41i3.33883

Abstract

Reuse of wastewater in the industry is mostly accomplished for watering plants. In a closed cycle, however, industrial wastewater can be returned through treatment to save water usage. This study aims to analyze textile wastewater's ability to be used as scrubbing liquid in the SO2 gas and particulate removal from coal combustion using a packed wet scrubber. Usually, the textile industry uses boiler fueled by coal and discharging base/alkaline wastewater. The method is carried out experimentally using a prototype device using a combination of cyclone and scrubber, with a source of coal combustion gas emissions. We did experiments using textile wastewater four times and two times using clean water as a control. We monitor the SO2, particulate emission in the gas stream, and pH, sulfate levels, and TSS levels in collected wastewater according to SNI. SO2 gas and particulates from coal combustion will be absorbed by the scrubber's wastewater spray so that SO2 will dissolve into sulfate, particulate matter into TSS. The study results using textile wastewater showed the removal efficiency of particulates on cyclone by 34-78%.  The removal efficiency of SO2 on wet scrubber was only 24.7%. There was an increase in TSS levels after passing through the scrubber by 46%. The rise in TSS and sulfate concentrations in the wastewater indicates the absorption of SO2 and particulates into wastewater. Based on this result, we can use textile wastewater for controlling the emission of SO2 and particulate from coal combustion by feeding it for the scrubber. However, the efficiency of this process is not optimal.
Studi Awal Pemanfaatan Rumput Laut dan Daun Cincau Hijau Sebagai Kandidat Bahan Alternatif untuk Injeksi Polimer EOR Huljannah, Miftah; Lestari, Fitra Ayu; Erfando, Tomi
TEKNIK Vol 41, No. 3 (2020): December 2020
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v41i3.28148

Abstract

The declining in production can occur because wells that have been producing for a long time are no longer able to lift oil to the surface in primary and secondary ways. Therefore, tertiary methods such as chemical injection like polymer flooding were carried out. Polymers commonly used in flooding polymers are divided into three namely synthetic polymers, biopolymers, and natural polymers. Natural polymers have abundant sources such as seaweed and grass jelly. This study was aimed to identify alternative renewable polymers as flooding polymer materials by knowing initial characteristics such as viscosity, compatibility and the effect of shear rates. This test wass carried out by an experimental method with several stages, namely drying, crushing to powder, and making polymers that were dissolved into brines that have different salinity. Then the polymer was allowed to stand for more than 24 hours until it was tested. The material tested was seaweed, grass jelly, and biopolymer xanthan gum as a comparison. The parameters used are polymer concentrations of 1000 ppm, 2000 ppm and 3000 ppm with each salinity of 3000 ppm, 9000 ppm and 15000 ppm. The test results showed that the characteristics of natural polymers were the same as biopolymers, the viscosity decreased as the brines salinity increased .The absence of sedimentation resulted from Seaweed and grass jelly  solution and formation water indicated that the polymers had good compatibility and  shear rate test has shown that the polymers are psuodoplastic.
Technical and Economic Analysis of Ship Launching with Slipway and Airbag KM. Sabuk Nusantara 72 in PT. Janata Marina Indah Shipyard Semarang Sugeng, Sunarso; Ridwan, Mohammad; Suharto, Suharto; Khristyson, Samuel Febriary
TEKNIK Vol 41, No. 3 (2020): December 2020
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v41i3.33710

Abstract

In a ship planning can not be separated from the planning of the ship launching process. A ship can glide perfectly if it has a high enough planning time and costs. The launch process itself is divided into several ways. The choice of this method needs to be considered because it relates to the budget and preparations made. The method used is the calculation according to the numerical approach assisted by computational software. In the first calculation it is planned with the slipway launch, and then the next one is planned with the airbags that have been implemented previously. The purpose of this study is to provide analysis results as a consideration in implementing the slipway and airbag ship launching method on KM ships. Belt Nusantara 72 measuring 2000 DWT. In steps 5 to 6, both the slipway and the airbags experience a stern lift condition with a value (yVd) of 1396.97 ton.  Based on the economic analysis of the hours of people using airbags, there is a decrease in working hours by 44% when compared to the launch using a slipway. This also happened to work productivity where it was 84% more time effective. When viewed from an investment point of view, the use of slipways is actually more economical than airbag, the difference is 43% more economical using slipways. Both types of launch can be applied by looking at the economical side and the ability of each shipyard in carrying out the launching process and seeing the main size of the ship to be launched.
Kontrol Ventilasi Mekanis Berbasis pada Jumlah Estimasi Penghuni menggunakan Sensor Karbon Dioksida Rahman, Haolia; Sukandi, Agus; Nasruddin, Nasruddin; Arnas, Arnas; Lapisa, Remon
TEKNIK Vol 41, No. 3 (2020): December 2020
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v41i3.33416

Abstract

Ventilasi merupakan unsur penting untuk menjaga kualitas udara yang baik di dalam sebuah bangunan. Namun, penggunaan ventilasi yang berlebihan menyebabkan tingginya konsumsi energi dari sistem HVAC. Standar ASHRAE telah memberikan aturan bahwa laju ventilasi tergantung dari banyaknya penghuni dan luas ruangan di dalamnya. Oleh karena itu kuantifikasi populasi penghuni perlu diketahui sebagai acuan sebuah kontrol ventilasi. Pada penelitian ini, jumlah penghuni diestimasi menggunakan metode Bayesian MCMC berdasarkan level CO2 di dalam ruangan. Persamaan kesetimbangan massa CO2 digunakan sebagai model perhitungan Bayesian MCMC. Pengujian metode Bayesian dalam mengestimasi jumlah penghuni diaplikasikan pada sebuah ruangan kantor skala kecil berukuran 96,7 m3 yang dilengkapi dengan sistem ventilasi, sehingga estimasi penghuni dan kontrol ventilasi dapat dilakukan secara bersamaan. Pengujian juga mencakup kontrol ventilasi konvesional menggunakan level CO2 secara langsung tanpa mengkonversinya menjadi jumlah penghuni. Laju ventilasi berdasarkan jumlah penghuni pada ruangan pengujian mengacu pada standar ASHRAE 62.1. Hasil pengujian menunjukan bahwa kontrol ventilasi berbasis pada estimasi jumlah penghuni menggunakan metode Bayesian berhasil dilaksanakan dengan nilai laju ventilasi per penghuni lebih mendekati standar ASHRAE 62.1 dibandingkan dengan ventilasi metode konvensional.
Kajian terhadap Tingkat Kerusakan Pahat pada Pembubutan dengan Metode Minimum Quantity Lubrication (MQL) Qoryah, Rika Dwi Hidayatul; Luviandy, Allen; Darsin, Mahros
TEKNIK Vol 41, No. 3 (2020): December 2020
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v41i3.27348

Abstract

This study aims to observe the tool deterioration following application of minimum quantity lubrication method (MQL). The designed MQL system is completed with an Arduino controller system which was able to be either manually-controlled or automatically-controlled. The tool used in this study is DCMT 11 insert type. The Taguchi method using the Orthogonal Array L9 design was used to compile the design of experiments with variations in depth of cut, coolant composition, and cooling fluid application methods. Each variable consists of three levels. Tool deterioration evaluated by observing it under an optic microscope from three sides of the tool. There are four levels of tool deterioration. The value of tool deterioration of each tool is the accumulation of each side view. ANOVA analysis found that depth of cut, cutting tool composition and method of applying coolant influence tool deterioration in percentage by 32.69%, 17.30 % and 12.82% respectively. Moreover, the minimum tool deterioration would be achieved when using the parameter combination of depth of cut of 1.6 mm; mixture composition of 3:7; and using the temperature-controlled MQL. 
Potensi Kawat Baja Sebagai Pengikat Tiang Dengan Pelat dalam Menahan Beban Saragih, Deardo Samuel; Sianturi, Novdin Manoktong; Purba, Virgo Erlando; Damanik, Dermina Roni Santika
TEKNIK Vol 41, No. 3 (2020): December 2020
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v41i3.29936

Abstract

Road and bridge construction needs to be supported by a strong system, both in terms of material and connections between structural elements. A pile reinforcement connection system with slab support construction on it needs to be considered to work together in carrying the load. Therefore, research is needed to determine how much effect the steel wire has as a binding pile with a plate in resisting uniform loads on it. This research was conducted by testing the model in a laboratory on a test medium that was reinforced with the pile with the slab system. Pile joints are distinguished bound perfectly and unbound. A reduction settlement analysis is performed on the difference in settlement for bound and unbound piles. The results showed that the pile system's performance, which was bound with steel wires on the slab, was better at resisting loads. This is known from the reduction of settlement for bound and unbound piles, which is 11.43% for the time stage and 11.51% for the load stage. The system can work together so that the stability of construction is better maintained and more durable.

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