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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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Efek Perlakuan Panas Terhadap Sifat Mekanik Logam Stainless Steel Seri J4 Priyotomo, Gadang; Astawa, I Nyoman Gede Putrayasa; Rokhmanto, Fendy
TEKNIK Vol. 42, No. 2 (2021): August 2021
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v42i2.36461

Abstract

Logam stainless steel (SS) seri J4 merupakan baja paduan austenitik krom dan mangan yang mempunyai kekuatan dan ketahanan korosi yang cukup baik. Namun umumnya, logam SS austenitik mengalami proses sensitasi saat terjadi pemanasan logam yang menurunkan sifat mekanik logam. Investigasi pengaruh sifat mekanik SS seri J4 terhadap variasi temperatur logam  dilakukan menggunakan uji tarik dan uji kekerasan mikro Vickers. Proses pemanasan logam dilakukan pada rentang suhu antara 600oC-1050oC. Penurunan nilai kekuatan tarik, kekuatan luluh, dan kekerasan yang disertai kenaikan ketangguhan dan elongasi terjadi seiring dengan kenaikan temperatur logam hingga 1050oC. Ini dimungkinkan akibat transformasi α’-martensite menjadi fasa austenit seiring dengan peningkatan temperatur pemanasan. Disisi lain, Penurunan nilai ketangguhan, kekuatan luluh dan elongasi terjadi pada kisaran temperatur pemanasan 700oC dimana ini mengindikasikan proses sensitasi paduan stainless steel J4 terjadi. Proses sensitasi logam SS akan berhubungan dengan kerentanan korosi retak tegang stainless steel.
Reactivation of the Spent Residue Fluid Catalytic Cracking (RFCC) Catalyst through Acid Treatment for Palm Oil Cracking to Biofuels Amalia, Rahma; Riyanto, Teguh; Istadi, Istadi
TEKNIK Vol. 42, No. 2 (2021): August 2021
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v42i2.39642

Abstract

This work discusses the treated spent Residue Fluid Catalytic Cracking (RFCC) catalysts using sulfuric or citric acids to examine the impact of acid treatment on the catalyst physicochemical properties and structural characteristics. The catalysts were characterized by X-ray diffraction (XRD), X-ray fluorescence (XRF), and Brunauer−Emmett−Teller-Barrett−Joyner−Halenda (BET-BJH) methods. The catalytsts were performed in a continuous fixed-bed reactor for catalytic cracking of palm oil. Changes of the catalyst characteristics and catalytic performance testing of the catalyst after the acid treatment for palm oil cracking process were discussed. It was found that the acid treatment on the spent RFCC catalyst can increase the surface area and pore volume of catalysts as well as the crystallinity. The closed pores in the spent RFCC are opened by acid treatment by eliminating heavy metals. Concerning to the catalytic performance, the acid-treated catalysts had better performance than the non-treated catalyst, which could increase selectivity of the kerosene-diesel range fraction from 47.89% to 55.41%. It was interested, since the non-treated catalyst could not produce gasoline fraction, while the acid-treated catalsysts could produce gasoline fraction at selectivity range of 0.57 – 0.84%. It was suggested that both sulfuric or citric acids treatment could increase the cracking performance of spent RFCC catalyst by shifting the product to lower hydrocarbons.
Peningkatan Akurasi Penghitungan Jumlah Kendaraan dengan Membangkitkan Urutan Identitas Deteksi Berbasis Yolov4 Deep Neural Networks Rofii, Faqih; Priyandoko, Gigih; Fanani, Muhammad Ifan; Suraji, Aji
TEKNIK Vol. 42, No. 2 (2021): August 2021
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v42i2.37019

Abstract

Models for vehicle detection, classification, and counting based on computer vision and artificial intelligence are constantly evolving. In this study, we present the Yolov4-based vehicle detection, classification, and counting model approach. The number of vehicles was calculated by generating the serial number of the identity of each vehicle. The object is detected and classified, marked by the display of bounding boxes, classes, and confidence scores. The system input is a video dataset that considers the camera position, light intensity, and vehicle traffic density. The method has counted the number of vehicles: cars, motorcycles, buses, and trucks. Evaluation of model performance is based on accuracy, precision, and total recall of the confusion matrix. The results of the dataset test and the calculation of the model performance parameters had obtained the best accuracy, precision. Total recall values when the model testing was carried out during the day where the camera position was at the height of 6 m and the loss of 500 was 83%, 93%, and 94%. Meanwhile, the lowest total accuracy, precision, and recall were obtained when the model was tested at night. The camera position was at the height of 1.5 m, and 900 losses were 68%, 77%, and 78%.
Noise Level Analysis of KM. Sabuk Nusantara 71 to Increase Ship Passengers Comfort Based on BKI Rules Sugeng, Sunarso; Ridwan, Mohammad; Sulaiman, Sulaiman; Khristyson, Samuel Febriary
TEKNIK Vol. 42, No. 2 (2021): August 2021
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v42i2.37441

Abstract

Noise is an unwanted sound or sound source which can distract or harm human health and comfort. According to experts, a sound that exceeds the level of human listening senses can cause deafness. Such danger can also be found in ships. An alternative to reduce noise in ships is by modifying the construction.  This research aims to compare noising before and after adding a side deck girder in the engine room of a 2000 DWT ship. The result showed that in the engine room, after adding a FB 180 x 8 mm FP 75 x 10 mm sized T profile, for 0-30 seconds intervals, the maximum noise was down from 127 dB to 62 dB or a 0.47% decrease. Meanwhile, the maximum noise was down from 98.6 dB to 57 dB in the accommodation room or decreased by 0.41%. The maximum noise was down from 83 dB to 37 dB or a 0.56% decrease in the navigation room. Such modification had reduced the average noise range from 80-40 dB to 55-20 dB.
Penilaian Risiko Bendungan Pelaparado Berbasis Metode Modifikasi ICOLD dan Metode Indeks Risiko Suprapto, Rachdian Eko; Japarussidik, Japarussidik; Sriyana, Sriyana; Sadono, Kresno Wikan
TEKNIK Vol. 42, No. 2 (2021): August 2021
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v42i2.39715

Abstract

Penilaian risiko bendungan terdiri dari analisis risiko dan evaluasi risiko sebagai salah satu bentuk kegiatan operasi, pemeliharaan dan pemantauan bendungan. Penelitian bertujuan untuk melakukan penilaian risiko Bendungan Pelaparado di Desa Pela, Kecamatan Monta, Kabupaten Bima, Provinsi Nusa Tenggara Barat. Bendungan Pelaparado merupakan jenis bendungan urugan batu dengan inti kedap di tengah. Penilaian risiko bendungan pada penelitian menggunakan metode modifikasi ICOLD dan metode indeks risiko. Metode modifikasi ICOLD didasarkan pada hasil inspeksi lapangan, evaluasi desain bendungan, evaluasi pengelolaan keamanan bendungan dan identifikasi dampak kegagalan bendungan terhadap daerah hilir. Metode indeks risiko didasarkan pada pembobotan perhitungan empiris parameter bentuk kegagalan dari hasil inspeksi lapangan, desain bendungan dan analisis potensi bencana. Hasil penilaian risiko merupakan dasar pertimbangan dalam penentuan prioritas pemeliharaan untuk mencegah peningkatan potensi kegagalan bendungan. Hasil penelitian menunjukkan Bendungan Pelaparado memiliki nilai risiko sebesar 67 dengan kategori risiko “tinggi”, nilai indeks risiko total sebesar 227,56 dan nilai keamanan 72,91 dengan klasifikasi keamanan “cukup”, sehingga Bendungan Pelaparado aman terhadap beban normal tetapi kemungkinan kurang aman terhadap banjir desain dan gempa desain.
Technical Reasoning on a Local Government Land Property as Heuristic Tool to Accommodate City Leaders Strategic Planning Wahyuddin, Yasser; Sudarsono, Bambang
TEKNIK Vol. 42, No. 2 (2021): August 2021
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v42i2.37581

Abstract

One of the Land Asset Management facets in Indonesia has been so far the possession of the land as an asset for local government. The regulation allows local government to organize local land assets to support land use planning in various patterns. While at the same time, Indonesia has a rigorous rule on land use planning with Euclidean Zoning System called RTRW Plan, which lasts for 20 years. Land use patterns could not be ruled by projecting a specific order, ideology, technical stances, etc. This article would like to contextualize a dynamic in which city leader infrastructure strategic planning was being technically anticipated by filtering out the feasibility of local land asset which meet the minimum requirement of the RTRW as the principal reference for spatial land use planning.  This article does not necessarily address its aim at problematizing RTRW; rather, in the first place, it discusses the vigorous of the local government technical department to bridge a so-called City Leader strategic planning with the current systems of the RTRW. Here, the article would argue that a tiny time frame of the City Leader's order leaves a narrow space for technical staff to map out a holistic technical plan. Instead, opting for a specific local land asset appeared to be the instant solution to such a plan. Furthermore, the second concern of this article specified its attention on providing the technical means so that the choice of the predetermined location was constructively and objectively justified beforehand.  A specific case study of Pekalongan Regency, Central Java Indonesia, allowed delving into the empirical case. The city leader was at the last year of his terms, and it was claimed, the choice to develop hospital infrastructure was part of a political maneuver. A qualitative approach in the form of in-depth interviews and compilation of secondary documents was employed. The city technical managers needed to operate rational technocratic mechanisms to the politico-technique juxtaposition to justify the planning problem's technical rationality and the other side to provide a technical solution, pointing out land assets under the framework of the RTRW. Thus, the arguments developed in this work contested the land choice technical assessments were not necessarily neutral rather a supporting element to adjust the overwhelming leader's strategic choice fully. Further discussion materials are proposed. In this case, the political strategy created a circumstance of instantaneity and a limited time frame that could lead to the enthusiasm of strategic thinking under the realm of the urban planning system.
Analisis Variasi Temperatur Sintering dan Ukuran Agen Pengembang Dolomit terhadap Fabrikasi Paduan Logam Mg-Ca-Zn Berpori Tertutup dengan Proses Metalurgi Serbuk Lestari, Franciska P.; Saputra, Brama A.; Erryani, Aprilia; Mulyati, Inti; Dwijaya, Made Subekti; Kartika, Ika
TEKNIK Vol. 42, No. 2 (2021): August 2021
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v42i2.36978

Abstract

Paduan logam berpori berbasis magnesium sangat potensial dalam aplikasi prostesis biomedis. Kalsium, seng dan agen pengembang ditambahkan untuk melengkapi fungsi dan aplikasi paduan. Dalam studi ini, paduan logam berpori Mg-Ca-Zn dikembangkan dengan proses metalurgi serbuk menggunakan dolomit (CaMg(CO3)2) sebagai agen pengembang untuk menghasilkan pori jenis tertutup. Variasi ukuran agen pengembang dan temperatur sintering dilakukan dengan tujuan untuk mencapai ukuran, persentasi dan kehomogenan pori yang terbentuk dalam paduan, dimana pori berfungsi untuk pertumbuhan tulang baru. Komposisi (%berat) paduan yang dikembangkan adalah 84,5Mg-0,5Ca-5Zn-10CaMg(CO3)2, dengan variasi temperatur sintering T = 650, 675, dan 700°C dan waktu tahan 5 jam, sedangkan ukuran dolomit CaMg(CO3)2 divariasikan -30 #, -50 #, -80 #. Paduan hasil sintering diuji XRD (x-ray diffraction) untuk menganalisis fasa yang terbentuk. Ukuran dan kehomogenan pori hasil sintering diamati dengan SEM (scanning electron microscopy), dan persentasi pori yang terbentuk diukur dengan menggunakan metode Archimedes sesuai standar ASTM B311-93. Sifat mekanik dari paduan hasil sintering diuji dengan alat uji kompresi mengacu pada standar ASTM D-695-02. Analisis XRD (x-ray diffraction) dalam paduan 84,5Mg-0,5Ca-5Zn-10CaMg(CO3)2hasil sintering terbentuk fasa Mg sebagai matriks, MgO, CaCO3 dan dolomit (CaMg(CO3)2). Persentasi porositas tertinggi diperoleh sebesar 32,60% dengan ukuran pori terbesar adalah ≤300 μm dan kekuatan tekan 143 MPa. Kondisi ini dihasilkan dalam paduan dengan ukuran partikel dolomit -30# dan temperatur sintering 700°C. Teknologi metalurgi serbuk dengan variasi temperatur sintering dan variasi ukuran agen pengembang dolomit berpengaruh signifikan terhadap ukuran, persentasi, dan kehomogenan pori serta sifat mekanik yang dihasilkan dalam paduan 84,5Mg-0,5Ca-5Zn.
Studi Eksperimental Pengaruh Jumlah Sudu terhadap Unjuk Kerja Pico Bulb Turbine Aliran Horisontal Himawanto, Dwi Aries; Nurdin, Akhmad; Bisri, Hasan
TEKNIK Vol. 42, No. 2 (2021): August 2021
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v42i2.39108

Abstract

Pada penelitian ini, dibahas pengaruh jumlah sudu terhadap peforma turbin propeller aliran horisontal pada skala kecil secara eksperimental. Saat ini perkembangan turbin air skala kecil mengalami banyak kemajuan, termasuk turbin air dengan aliran horisontal. Turbin air pada aliran horisontal dapat diaplikasikan pada saluran irigasi, saluran sistem perpipaan, saluran instalasi pengolahan air limbah, dan saluran-saluran tertutup lainnya. Pengukuran dynamic head pada aliran horisontal berdasarkan  nilai pressure drop atau perbedaan tekanan sebelum dan sesudah turbin. Bulb statis yang diletakkan sebelum turbin bertujuan meningkatkan kecepatan aliran air dan berpotensi meningkatkan kinerja turbin. Penelitian ini bertujuan untuk mengetahui pengaruh jumlah sudu  terhadap peforma dan efisiensi turbin propeller. Kemiringan sudu yang digunakan 200 dengan bulb ratio 0,6 terhadap diameter pipa. Variasi jumlah sudu yang digunakan 4, 5, 6, dan 7 buah dengan masing-masing diuji pada debit 7 L/s, 9 L/s, 11 L/s, dan 13 L/s. Hasil penelitian ini menunjukkan jumlah sudu 5 dengan debit 13 L/s menghasilkan peforma turbin terbaik dibandingkan dengan jumlah sudu lainnya, selain itu jumlah sudu 5 dengan debit 13 L/s menunjukkan nilai efisiensi terbaik sekitar 40%.
Analisis Dampak Penggunaan Portable Sealer Terhadap Jumlah Drop Out Component di Lini Produksi Surface Mounting Technology Nugroho, Adi; Muchid, Abdul
TEKNIK Vol. 42, No. 2 (2021): August 2021
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v42i2.33816

Abstract

The study aims to reduce the drop out of components that occur in the surface-mounting technology production line of PT. TEC Indonesia. This effort is carried out by designing a portable sealer product to glue the cover tape and carrier tape component products made in the line. In order to obtain the best value indicator for product design, this study uses a quantitative factorial design technique to determine value reduce drop out of components in the surface mounting technology (SMT) production of the parameter combination use of adhesive strength produced by the product. Information on study data obtained through the concept of experimental design (DOE) using temperature and treatment time parameters resulting from the product's design. Results of the tests have been carried out. Information on the adhesive strength reaches standard is rated at a temperature 1200 C for one two and three seconds, which can produce adhesion of 0.029 Kgf (the standard value is at 0.02-0.07 Kgf). In addition, the number of drop-out components produced after using the product has decreased significantly to zero, which previously reached an average of two to three components that were damaged or defective (test data).
Perbandingan Identifikasi Penggunaan American Sign Language Menggunakan Klasifikasi Multi-Class SVM, Backpropagation Neural Network, K - Nearest Neighbor dan Naive Bayes Gunawan, Vincentius Abdi; Putra, Leonardus Sandy Ade
TEKNIK Vol. 42, No. 2 (2021): August 2021
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v42i2.36929

Abstract

Communication is essential in conveying information from one individual to another. However, not all individuals in the world can communicate verbally. According to WHO, deafness is a hearing loss that affects 466 million people globally, and 34 million are children. So it is necessary to have a non-verbal language learning method for someone who has hearing problems. The purpose of this study is to build a system that can identify non-verbal language so that it can be easily understood in real-time. A high success rate in the system needs a proper method to be applied in the system, such as machine learning supported by wavelet feature extraction and different classification methods in image processing. Machine learning was applied in the system because of its ability to recognize and compare the classification results in four different methods. The four classifications used to compare the hand gesture recognition from American Sign Language are the Multi-Class SVM classification, Backpropagation Neural Network Backpropagation, K - Nearest Neighbor (K-NN), and Naïve Bayes. The simulation test of the four classification methods that have been carried out obtained success rates of 99.3%, 98.28%, 97.7%, and 95.98%, respectively. So it can be concluded that the classification method using the Multi-Class SVM has the highest success rate in the introduction of American Sign Language, which reaches 99.3%. The whole system is designed and tested using MATLAB as supporting software and data processing.

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