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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.
Arjuna Subject : -
Articles 18 Documents
 1   2 
Search results for , issue "In Press" : 18 Documents clear
Desain Manifold dengan Monitoring Tekanan untuk Pertukaran Otomatis Tabung Gas Oksigen Medis di Rumah Sakit Hendryani, Atika; Nurdinawati, Vita; Dharma, Nashrul
TEKNIK In Press
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v42i1.33127

Abstract

The regulation and supply of oxygen as one of the medical gases in the hospital is important to ensure the availability of these gases for the survival of patients. The regulation of oxygen gas in hospitals usually uses a piping system with manifolds. The manifold will monitor the oxygen gas pressure on each tube. Manifold systems that are widely used in general can only monitor pressure but cannot perform an automatic exchange on gas cylinders if the pressure is under the permissible conditions. The manifold system design developed is equipped with pressure monitoring for automatic exchange of oxygen gas cylinders using pressure sensors and microprocessors.  The test results of the system using regulator and barometer comparisons showed the percentage value of sensor pressure accuracy of 96.92 percent and 97.16 percent. At pressure below the limit of 285 KPa manifold can perform the exchange of active gas cylinders automatically. These results show the manifold design built can work quite well.
Rancang Bangun, Uji Performansi dan Analisis Biaya Alat Pencampur Nutrisi Kuala, Seri Intan; Susanti, Novita Dwi; Siregar, Yusnan Hasani; Haryanto, Aidil; Basuki, Galih Riyan
TEKNIK In Press
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v42i1.24800

Abstract

Tujuan penelitian ini adalah merancang bangun alat pencampur nutrisi tanaman pada sistem hidroponik DFT (Deep Flow Technique) yang dilengkapi dengan sistem kendali jumlah zat padat terlarut (TDS, satuan ppm) dan agitator. Tahap kegiatan dimulai dengan melakukan perancangan, konstruksi, pengujian serta analisis biaya. Perancangan terdiri dari perancangan struktural dan fungsional. Hasil perancangan diperoleh dimensi 0,85 m x 0,55 m x 1,550 m, yang terdiri dari sebuah reservoir, sebuah wadah penampung nutrisi A dan nutrisi B yang masing-masing berkapasitas 100 liter dilengkapi dengan agitator yang digerakan dengan motor DC 45 watt. Unjuk kerja sistem elektrik dilakukan untuk memastikan kecukupan nutrisi (TDS) serta ketinggian air dalam reservoir. Pengujian kerataan TDS dan temperatur larutan nutrisi diukur setiap 720 detik dalam rentang 3600 detik pada 5 titik dengan hasil masing-masing memiliki simpangan rata-rata 1,4430%+5% dan 4,9054%+5%. Pengujian penanaman dengan menggunakan alat pencampur pada tanaman pakcoy dan bayam masing-masing 5,95 kg dan 2,5056 kg lebih banyak dibanding tanpa menggunakan alat pencampur. Sedangkan untuk analisis biaya produksi alat pencampur dan diperoleh Rp8.981.019. Dalam analisa biaya penanaman pakcoy dan bayam diperoleh selisih dengan harga pasaran sebesar Rp13.273.
Analisis Uji Geser Tanah Merah Residual dengan Metode Slurry di Kabupaten Semarang Pardoyo, Bambang; Wirawan, Briota Akhbar; Huda, Khoirul
TEKNIK In Press
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v42i1.33261

Abstract

Residual soil is found in most areas with mountainous, hilly, and undulating topography. This soil is marked by red or brown color. This study aims to determine the physical and mechanical properties of soil in the original soil and residual soil conditions using the slurry method. Research objects were taken from residual red soil of The East Ungaran District, Bergas District, and Bawen District. Analysis of the physical and mechanical properties test shows that the soil sample is a type of clay with kaolinite constituent minerals and moderate swelling ability, and direct shear testing from locations L1, L2, and L3 obtained residual peak shear angles using the slurry method of 29,249 °; 31,341 °; 31,964 ° and constant residual shear angle value of 8,082 °; 8,138 °; 7,294 °, the value of the original soil shear angle has a value of 32.82 °; 31.44 °; 31.98. The higher the value of the plasticity index, the higher the value of the free swell. The relationship between the plasticity index and the value of the residual peak shear angle shows that the results of the peak shear angle and the plasticity index are still within the scope of standard deviation. The value of the constant residual shear angle with the slurry method is much smaller than the test result graph.
Analysis of Halal and Marketing Strategy for Broiler Chickens' Supply Chain during Covid-19 : A Case Study in Yogyakarta, Indonesia Asih, Hayati Mukti; Firmansyah, Fahri; Faishal, Muhammad
TEKNIK In Press
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v41i3.31296

Abstract

Corona virus has a destructive impact on the world's economy, especially in Indonesia, making a large-scale social restriction policy (SRL). Many restaurants, hotels, schools, and colleges in Yogyakarta are closed. Consumers, mostly students from outside Yogyakarta, have to return to their hometowns. This case impacts the decline in chicken prices to cover losses due to excess supply and decreasing demand. This research aims to analyze the decline in chicken prices, halal products' and the concept of marketing strategies impact on the chicken supply chain during the Covid-19 outbreak in Yogyakarta. This research used SEM to obtain accurate analysis and descriptive results to overview phenomena from society under study. The analysis using SEM shows that halal factors do not significantly affect consumer decisions in buying chicken. However, it was found that there was an increase in consumers in online shopping, which could create new strategies in marketing strategies. The application of online marketing strategies will improve consumers' services so that it is expected to be a novel value that can increase consumer buying interest during the Covid-19 outbreak in Yogyakarta, Indonesia.
Analysis of Leakage Current and Insulator Resistivity for Quality Assurance of Medium Voltage Network Polymer Insulators Alumina - SiO2 in Tropical Climate Simulator Room Utami, Agnes Manik Sari; Syakur, Abdul; Hermawan, Hermawan
TEKNIK In Press
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v42i1.36152

Abstract

The tropical climate of Indonesia, which has moderately high rainfall, has an impact on the output of outdoor insulators. The presence of chemical particles, pollen, and salt in the air will bind to the insulating material's outer surface and settle, resulting in crystallization that allows the insulating material's surface roughness to increase. One of the insulators that are being produced is an insulator made of epoxy resin. The injection of fillers is used to further improve the durability of the outdoor epoxy resin insulators installed in tropical climatic conditions. Epoxy resin from bisphenol A-epichlorohydrin and polyaminoamide combined with silane, alumina, and SiO2 is used as research materials. The parameters examined were leakage current and resistance to insulation. The use of silane as a hardener will also improve the resistivity on the surface of the insulator, which makes it more difficult to flow or reduces the leakage current. Alumina is well-known for being a solid heat and voltage insulator. The addition of SiO2 to the epoxy resin insulating material increases the insulator's mechanical strength in the form of tensile and compressive strength. With fluctuations in temperature and humidity, the artificial tropical environment is replicated in a test chamber. The value of the leakage current increases with an increase in temperature and humidity. The correlation between air temperature and humidity and insulation resistance is inversely proportional, the higher the temperature applied to the insulator, the lower the insulator resistivity. The same refers to the relationship between air humidity and resistance to insulation. The higher the humidity applied to the insulator, the lower the insulator resistivity. At a test voltage of 11 kV, a humidity of 60%, and a temperature variation of 25oC, the leakage current of epoxy resin insulators is up to 9.2 uA lower than in a factory-made SiR insulator. The leakage current and insulator resistivity's number is already in the good and protected range such that the insulator can be used and reproduce.
Analisis Stabilitas KM. Rejeki Baru Kharisma Rute Tarakan – Tanjung Selor Alamsyah, Alamsyah; Zulkarnaen, Zen; Suardi, Suardi
TEKNIK In Press
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v42i1.31283

Abstract

Ship stability that is not according to the IMO standard will make the ship capsize when operating. The purpose of this research is to determine the cause of the overturn in terms of the stability criteria of the ship. The method used is software  of simulation. Stability analysis is carried out with the load case that occurs in the field when an accident occurs and the ideal loadcase according to PM 104 2017 standards about’s the transportation of operation. The results showed is cargo of goods placed on the roof top (loadcase 1) based on the criteria of Intact Stability; area of the stability arm curve at heeling 0° ~ 30° = 0.9417 m.deg, area 0° ~ 40° = 1,0200 m.deg, 30° ~ 40° = 0.0783 m.deg, GZ value at heeling 30° = 0.029 m, angle of occurrence of maximum GZ = 21.8°, and the initial GMt value = 0.135 m, the results stated that all did not meet the Intact Stability code A.749 criteria, while in it was obtained cargo of goods placed in the hull (loadcase 2) based on Intact Stability; area of the stability arm curve at heeling 0° ~ 30° = 4.5338 m.deg, area 0° ~ 40° = 7.1643 m.deg, area 30° ~ 40° = 2.6305 m.deg, GZ value at heeling 30° = 0.265 m, angle of occurrence of maximum GZ = 34.5°, and the initial GMt value = 0.621 m, the results stated that all met the Intact Stability code A.749 criteria
Rancang Bangun Sistem Monitoring Daya Baterai Pembangkit Listrik Tenaga Surya (PLTS) dan Kontrol Beban Berbasis Internet of Things Alfita, Riza; Joni, Koko; Darmawan, Fajar Dwika
TEKNIK In Press
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v42i1.29687

Abstract

Teknologi Internet Of  Things dalam penelitian ini dimanfaatkan pada Pembangkit Listrik Tenaga Surya (PLTS) (Studi Kasus : Prodi Teknik Elektro Universitas Trunojoyo Madura) sebagai sistem monitoring daya baterai dan kontrol beban. Semua sistem tersebut dibangun dengan tujuan mempermudah pengguna dalam mengelola konsumsi daya yang digunakan sekaligus mencegah kerusakan baterai sehingga masa pakai baterai dapat bertahan lebih lama dan penggunaan PLTS menjadi lebih optimal. Semua sistem tersebut dirancang menggunakan beberapa komponen yang saling terintegrasi dengan fungsi masing-masing seperti Raspberry sebagai pengolah data, smartphone sebagai interface, dan sensor aktuator sebagai input output. Dari hasil pengujian akurasi monitoring didapatkan nilai error rata-rata sebesar 1,56 %. Setelah memastikan sistem memiliki tingkat akurasi yang tinggi, dilakukan pengujian charge-discharge secara real time selama 7 hari yang menunjukan bahwa sistem bekerja sesuai tujuan penelitian yang dibuktikan dengan tidak adanya penggunaan daya melebihi batas standar SOC baterai yang digunakan sebesar 30%. Sedangkan untuk pengujian sistem kontrol didapatkan bahwa koneksi wifi memiliki rata-rata delay paling cepat selama 10,30 s, provider A 11,17 s, dan provider B 12,60 s.
Analisis Symmetrical dan Nonsymmetrical Vertical Expansion Loop untuk Meningkatkan Fleksibilitas dan Menurunkan Tegangan Pipa Berdasarkan ASME B31.3 Mahardhika, Pekik; Husodo, Adi Wirawan; Kusuma, George Endri; Witjonarko, Raden Dimas Endro; Budiyanto, Ekky Nur
TEKNIK In Press
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v42i1.29244

Abstract

Thepiping system is a medium used to convey, distribute, mix, separate, discharge, meter, control or snub fluid flows, and transmit a fluid pressure. The piping system design will have stresses due to thermal and pressure effect. The thermal effect induce pipe expansion. The pipe expansion affect to pipe flexibility, so it is necessary to design an expansion loop. Expansion loop is a method used to increase flexibility in piping systems. This article aims to analyze symmetrical and non-symmetrical in vertical expansion loops whether it can increase flexibility and reduce pipe stress. This article conducts an expansion loop design with 3 trials, namely trial 1 (Vertical Expansion Loop), trial 2 (Nonsymmetrical Vertical Expansion Loop 1), and trial 3 (Nonsymmetrical Vertical Expansion Loop 2). The three trials were compared for flexibility and stress values based on ASME B31.3 requirements. The study results show that all trial 1, trial 2, and trial 3 have good flexibility with a value of 0.00016 because not exceed the requirements of ASME B31.3. The highest design code stress value in trial 1 is 5955 psi (Node A07F), trial 2 is 5906 psi (Node A05F), and trial 3 is 5906 psi (Node A06N). All trials have a code stress not exceeding the allowable stress (20000 psi). So that the symmetrical or nonsymmetrical design of the vertical expansion loop can both increase flexibility and reduce pipe stress.
Analisis Pengaturan Temperatur, Konsentrasi, dan Waktu Pengadukan pada Tekanan Atmosferik untuk Meningkatkan Kepresisian Densitas Larutan Alginat Permanadewi, Indrasukma; Kumoro, Andri Cahyo; Wardhani, Dyah Hesti; Aryanti, Nita
TEKNIK In Press
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v42i1.35994

Abstract

Alginat merupakan polimer polisakarida linier yang sangat mudah larut dalam air dengan densitas dan viskositas yang dapat diatur sesuai keperluan. Sifat khas ini membuat alginat banyak digunakan dalam industri pangan maupun non pangan. Seperti pada kebanyakan bahan alam lainnya, densitas larutan alginat pada umumnya juga dipengaruhi oleh temperatur, konsentrasi dan waktu pengadukan. Karenanya, penelitian ini bertujuan untuk meningkatkan kepresisian densitas larutan alginat dengan pengaturan temperatur (30, 45, 60 dan 75°C), konsentrasi alginat (1, 2, 3, 4 dan 5% massa) dan waktu pengadukan (15, 30, 45 dan 60 menit) menggunakan metode piknometri. Hasil penelitian menunjukkan bahwa semakin tinggi temperatur maka densitas akan semakin rendah, sebaliknya semakin tinggi konsentrasi dan waktu pengadukan maka densitas larutan alginat akan semakin meningkat. Dengan demikian, dapat disimpulkan apabila menginginkan densitas larutan alginat 0,9228 g/ml maka konsentrasi alginat yang digunakan 2% dengan suhu 30°C dan waktu pengadukan 30 menit.
Analisis Pengaruh Perubahan Kekakuan Pondasi Kapal Ikan Tradisional terhadap Amplitudo Getaran Lekatompessy, Debby Raynold
TEKNIK In Press
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v42i1.30978

Abstract

The ship with the outboard engine is intended to make it easier for fishers to operate and maintain. However, the magnitude of the vibration due to the excitation of the engine during operation adversely affects the surrounding structures. It is evidenced by measuring the vibration amplitude of more than 0.02 mm at several points around the ship engine foundation. This study aims to reduce these vibrations by changing the canal's dimensions as a foundation and using damping rubber as the simplest solution. The analysis was carried out by calculating the vibration parameters of 2 types of machines, SR1110 and S1100. The numerical method is used to calculate the vibration's amplitude by varying the value of channel stiffness and rubber damping on the machine foundation. Supporting data is obtained by measuring the vibration amplitude at several points around the foundation. The magnitude of the previous vibration amplitude is 0.078 mm for the SR1110 type and 0.069 mm for the S1100 type, which exceeds the limit still. The amplitude is reduced by changing the foundation's dimensions and using a rubber damper (c). With the new foundation dimensions, the amplitude for the diesel engine type SR1110 becomes 0.0245 mm and type S1100 becomes 0.0238 mm. Increased stiffness and the addition of rubber succeeded in reducing the vibration amplitude by a significant value. The amplitude was reduced by 69% for the SR1110 engine type and 65% for the S1100 engine type within the allowable limit of less than 0.02 mm to 0.03 mm based on Barkan's observation results.

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