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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 522 Documents
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Exploring Wear Characteristics of AISI 1045 Steel under Variable Disc Rotation Speeds: A Tribological Investigation Afif, Ilham Yustar; Jamari, Jamari; Saputra, Eko; Saefudin, Slamet; Subri, Muhammad; Amin, Muh.
TEKNIK Vol. 45, No. 1 (2024): May 2024
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v45i1.59720

Abstract

Reliable mechanical components are the desired final product. When mechanical components come into contact with each other, there is a possibility of failure. Contact between components can result in friction leading to wear. Friction and wear can be studied through the science of tribology. The aim of this paper is to investigate the wear of AISI 1045 steel using a pin-on-disc tribometer with varying disc rotation speeds (rpm), to calculate the values of wear volume and specific wear rate. This research demonstrates that variations in disc rotation speed influence changes in sliding distance, wear width, wear volume, and specific wear rate on AISI 1045 steel pin. The conclusion drawn from this study is that as the disc rotation speed increases, the wear volume increases, and the specific wear rate decreases.
Analisis Regresi Untuk Penentuan Faktor Koreksi Data Hujan Satelit (Studi Kasus Daerah Tangkapan Air Bendungan Way Apu) Nugroho, Adi Prasetya; Sachro, Sri Sangkawati
TEKNIK Vol. 45, No. 1 (2024): May 2024
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v45i1.60335

Abstract

Pengelolaan Bendungan Way Apu memerlukan ketersediaan data curah hujan yang akurat dan memiliki rentang periode yang panjang. Untuk menangani berbagai permasalahan keterbatasan data dan lokasi pos hujan observasi yang terletak di luar DTA Bendungan Way Apu dapat menggunakan data hujan satelit GPM-IMERG. Studi ini bertujuan untuk mengevaluasi dan menentukan faktor koreksi data hujan satelit GPM-IMERG dibandingkan dengan data pos hujan observasi untuk melihat kelayakannya. Koreksi data hujan satelit menggunakan metode regresi untuk kemudian dilakukan validasi dengan Uji Kesalahan Relatif (KR), Nash-Sutcliffe Efficiency (NSE), Koefisien Korelasi (R) dan Root Mean Squared Error (RMSE). Hasil studi menunjukkan perbandingan data hujan GPM-IMERG dengan data hujan observasi pada data hujan bulanan cenderung konsisten terhadap data 3 (tiga) pos curah hujan di DAS Way Apu yaitu Stasiun Meteorologi Namlea, PCH Savana Jaya dan PCH Wae Tina dengan koefisien korelasi sebesar 0,63- 0,72 (interpretasi korelasi kuat). Dari validasi 3 (tiga) rentang data hujan berbeda, skenario validasi periode 3 (tiga) tahun pada PCH Wae Tina memiliki hasil yang paling baik dalam kondisi sebelum maupun sesudah dikoreksi dengan faktor koreksi paling baik yaitu menggunakan persamaan regresi linier intercept y = 1,0620x dan koefisien determinasi (R2) sebesar 0,8660.
Evaluasi Keamanan Bendungan Telaga Tunjung dari Tinjauan Deformasi Vertikal Menggunakan Analisis Data Instrumentasi Patok Geser Hazim, Muhammad Fadhlurrahman; Sukamta, Sukamta; Suprapto, Suprapto
TEKNIK Vol. 45, No. 1 (2024): May 2024
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v45i1.59191

Abstract

Bendungan Telaga Tunjung yang terletak di Provinsi Bali yang dibangun pada tahun 2003-2006. Pada tahun 2015 dan 2020 telah dilakukan survey bathimetri akibat jumlah sedimen telah memenuhi tampungan waduk hingga mengurangi umur layan waduk. Tujuan dari penelitian ini adalah mengevaluasi keamanan bendungan yang ditinjau dari deformasi vertikal dari data bacaan alat instrumentasi patok geser. Penelitian ini menggunakan data dari bacaan patok geser yang kemudian dianalisis nilai settlement index dan nilai deviasi yang dibandingkan dengan kriteria penerimaan yaitu 1% dari tinggi bendungan. Penelitian ini memakai data pada tahun 2006, 2007, 2017, dan 2022. Hasil dari penelitian ini pada tahun 2017 menunjukan di daerah lereng hulu main dam dalam kondisi yang kurang aman karena nilai deviasi melebihi 1% dan nilai settlement index di atas 0,02, namun kondisi terakhir pada tahun 2022 deformasi vertikal bendungan dalam kondisi aman karena semua nilai deviasinya masih di bawah 1% dan nilai settlement index di bawah 0,02.
Study of Machining Strategies for CNC Milling of Foot Prosthetic Using Taguchi Methodology Lestari, Wahyu Dwi; Adyono, Ndaru; Faizin, Ahmad Khairul; Sanjaya, Kadek Heri
TEKNIK Vol. 44, No. 3 (2023): December 2023
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v44i3.57885

Abstract

The use of CNC milling machines in the industrial sector greatly contributes to the production of high-quality products that align with consumers' desired shapes. Currently, the precise machining parameters for manufacturing a product are determined through a time-consuming and costly process of trial and error. Most prior significant studies have examined the variables that can impact the duration of machining time. However, different machining conditions require different control factors. The key objective of this study is to enhance the machining parameters and identify the crucial factors that influence the duration of machining in the production of foot prostheses. The experiment was conducted using a 3-axis CNC milling machine with five machine parameters: spindle speed, feed rate, step over, depth of cut, and toolpath strategy. The Taguchi method with orthogonal array L2735 was chosen as an optimization method. The optimum machine parameters are analyzed using signal-to-noise (S/N) ratio and ANOVA. The analysis shows that spindle speed is the most influential variable on machine time. The next factor is the depth of cut, feed rate, and toolpath strategy, and the last is step over.
Evaluation of High-Performance Interference Canceller to Boost the Error Performance of The Wi-Fi 5 IEEE 802.11ac Syafei, Wahyul Amien; Hidayatno, Achmad; Nurhayati, Oky Dwi; Nugraheni, Dinar
TEKNIK Vol. 45, No. 1 (2024): May 2024
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v45i1.60252

Abstract

The Wi-fi 5 IEEE 802.11ac can achieve throughput up to 6,933 Mbps by occupying 160MHz of bandwidth in each eight spatial streams with 256-QAM. It provides not only very high throughput but also high performance of wireless communications. However, due to the use of multiple antennas at both transmitter and receiver side which operate in the same frequency band; it experiences many interference signals. Therefore, a high-performance interference canceller is highly required to cancel these interferences and get the desired information back. The conventional interference cancellers are based on linear method, i.e. zero forcing and minimum mean square error. Both are simple but low in performance. This paper presents evaluation of a high-performance interference canceller based on maximum likelihood detection to boost the error performance of the wi-fi 5. Run test under in-door channel model demonstrates the superiority of this interference canceller. For target bit error rate of 10-4, it dramatically boosts the error performance by 16 dB and 17,5 dB compared to linear methods by the cost of very high complexity.
Analisis Hidrogeokimia Dan Logam Berat Pada Air Tanah Menggunakan Metode WQI dan HPI Untuk Keperluan Higiene Sanitasi Kabupaten Belitung Timur Putri, Maya Aiko Salsabila; Putranto, Thomas Triadi; Santi, Narulita
TEKNIK Vol. 44, No. 3 (2023): December 2023
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v44i3.56996

Abstract

Kelapa Kampit is one of the tin-producing districts in East Belitung, which is composed of the Kelapa Kampit Formation. This mining activity affects water quality, which, of course, is also influenced by geological formations. This study aims to analyze the hydrogeochemistry and heavy metals in shallow groundwater in Kelapa Kampit District using water quality indexes in the form of water quality index and heavy metal pollution index methods. Hydrogeochemical test results showed a pH value of water 4 – 6.77 in the acidic category, a DHL value of 20 – 145 μS/cm, and a TDS value of 14 – 111 mg/L. From the visualization of chemical data, groundwater has various facies. The results of the Stiff Diagram show that water contains predominant calcium, magnesium, sulfate, and bicarbonate ions. The Gibbs diagram results show that the water has not been contaminated. The results of heavy metal testing also showed that the values of Fe2+, Mn2+, Pb2+, Zn2+, and Cu2+ were classified as low, and Al3+ was quite high. The results of water quality testing using the water quality index showed that the research area had excellent water quality, and the results of the heavy metal testing using the HPI method showed a low heavy metal contamination value. Based on hydrogeochemical and heavy metal analysis of shallow groundwater, Kelapa Kampit District has good groundwater quality for sanitation hygiene purposes.
Analisis Peningkatan Kapasitas Hidrolik Terowongan Pengelak Menghadapi Perubahan Debit Banjir Rencana (Studi Kasus Bendungan Bener) Tryamarti, Cindy; Sachro, Sri Sangkawati
TEKNIK Vol. 45, No. 1 (2024): May 2024
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v45i1.60324

Abstract

Pembangunan bendungan ketika konstruksi dilindungi oleh bangunan pengelak terdiri dari terowongan pengelak dan bendungan pengelak. Bangunan pengelak berfungsi mengelakkan air saat konstruksi agar area kerja terbebas dari gangguan aliran air. Terowongan pengelak di Bendungan Bener sedang tahap konstruksi sedangkan konstruksi bendungan pengelak dilaksanakan pada akhir tahun 2023. Oleh karenanya perlu dilakukan estimasi kapasitas terowongan pengelak serta penentuan elevasi bendungan pengelak dalam menampung debit banjir dengan kala ulang 25 tahun bertujuan agar tidak terjadi overtopping pada masa konstruksi. Metode untuk mendapatkan kapasitas terowongan pengelak dengan melakukan penelusuran banjir pada terowongan pengelak. Hasil analisis debit banjir rencana kala ulang 25 tahun dengan software HEC – HMS sebesar 565,90 m3/det. Penelusuran banjir di terowongan pengelak diameter 7,00 meter didapatkan elevasi bendungan pengelak +250,00 meter. Elevasi tersebut melebihi dari elevasi rencana perlu adanya skenario lain. Skenario 1 dengan penambahan 1 buah terowongan diameter 7,00 meter diperoleh tinggi bendungan pengelak pada elevasi +236,50 meter dan skenario 2 pada elevasi +235,00 penambahan 1 buah terowongan diameter 9,00 meter. Berdasarkan analisis kapasitas terowongan pengelak dapat terpenuhi pada skenario2 sehingga yang terpilih skenario 2.
Comparison of Rainfall -Runoff Models with F.J. Mock and NRECA to Determine Water Availability of Rukoh Reservoir, Aceh Hidayat, Maulana; Nugroho, Hari
TEKNIK Vol 46, No 1 (2025) January 2025
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v46i1.67951

Abstract

Rukoh Reservoir is located in the upper part of Krueng (Kr.) Rukoh River Watershed, Pidie Regency, Aceh Province with a catchment area of 19.63 Km2. This reservoir has a storage capacity of 124.42 million m3 and is used for irrigation, drinking water and hydropower. The condition of Kr. Rukoh there is no discharge recording device, so to obtain discharge data it is necessary to convert rainfall data into discharge in the form of Rainfall-Runoff Model.  The purpose of this research is to calculate the amount of flow discharge and the suitability of the two rainfall-runoff models using the F.J. Mock method and NRECA method with observed discharge. Furthermore, determining the amount of reliable discharge as inflow availability of Rukoh reservoir. This research begins with the collection of rainfall data, evapotranspiration and condition parameters of the Rukoh Reservoir catchment area. The parameters in both models are optimized to obtain the optimal model discharge that is close to the observed  discharge data (Qobs). The results of the model suitability test showed that the NRECA model discharge is better compared to the F.J. Mock discharge model, the NSE test value = 0.64 and the correlation test value R = 0.83. Based on the selected discharge model, the calculation obtained the average flow discharge as Rukoh reservoir inflow of 1.13 m3 / sec and 80% water availability of Rukoh Reservoir by 0.58 m3/sec and 90% water availability obtained at 0.43 m3/sec.
Simulation Analysis of Base Year Operation Pattern Method of Marangkayu Reservoir East Kalimantan Province Sihite, Gonzales; Nugroho, Hari
TEKNIK Vol 46, No 1 (2025) January 2025
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v46i1.67652

Abstract

Marangkayu is a multi-purpose dam that serves irrigation water needs for a functional area of 1,500 hectares and provides raw water supplementation of approximately 450 liter per second. One of the requirements for impounding certification involves the preparation of an operational guideline for the dam. Therefore, this study aims to analyze the reservoir operation pattern by simulating water availability and demand. The reservoir operation pattern is determined through simulations based on calculations of water inflow, water demand, and losses, constrained by the reservoir's storage capacity. The simulation calculations employ the baseline year method, which includes dry years, normal years, and wet years. Reservoir water availability simulations are conducted under three conditions: dry year (probability of being equaled or exceeded 65%), normal year (probability of being equaled or exceeded 50%), and wet year (probability of being equaled or exceeded 35%). The results of this study indicate that the simulation of Marangkayu reservoir's operation pattern for dry, normal, and wet conditions can sufficiently meet the water needs for a functional irrigation area of 1,500 hectares with a cropping pattern of rice–rice–secondary crops, raw water demand of 450 liter per second, and river maintenance flow of 0.848 m³/second.
Slope Stability Analysis with Bore Piles for Landslide Prevention Using Plaxis LE 2D Inabah, Redha Fatki; Sukamta, Sukamta
TEKNIK Vol 46, No 2 (2025) April 2025
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v46i2.67926

Abstract

The Rukoh Diversion Channel is an integral part of the Rukoh Dam, with the purpose of providing additional supply (supplement) to the Rukoh Dam reservoir of 15 m³/second. One of the components of the Rukoh Control Structure is a tunnel. The soil at the location of the Rukoh Diversion Channel tunnel consists of clay shale. Clay shale soil is a primary factor that causes landslides. Clay shale is a part of sedimentary rock, where this type of soil can undergo weathering in a short period when exposed to water, air, and sunlight. Several landslides have occurred at the inlet of the tunnel. Construction activities such as excavation and embankment can expose the soil, which may lead to a reduction in the shear angle of that soil. Landslide events at the inlet of the tunnel require management through soil reinforcement with bore piles using Plaxis LE 2D. This study aims to analyze the stability conditions of the slope in its existing state and with the reinforcement provided by bore piles. The factor of safety for the existing slope condition is 1.440, which is categorized as less than the required safety factor. The bore piles are planned to be 0.6 m wide and 8 m long. The bearing capacity analysis for the bore piles is 16147.21 kN, with the allowable lateral force provided by the bore piles using broms method being 54.348 kN. After the installation of the bore piles, the factor of safety for the slope is 1.868, which meets the minimum required threshold of 1.5.

Page 47 of 53 | Total Record : 522

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