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Semesta Teknika
Published by Universitas Muhammadiyah Yogyakarta
ISSN : 1411061X     EISSN : 25025481     DOI : https://doi.org/10.18196/st
Core Subject : Engineering,
Engineering
SEMESTA TEKNIKA is a reputable refereed journal devoted to the publication and dissemination of basic and applied research in engineering. SEMESTA TEKNIKA is a forum for publishing high quality papers and references in engineering science and technology. The Journal is published by the Faculty of Engineering, Universitas Muhammadiyah Yogyakarta, INDONESIA. Copyright is by the publisher and the authors. The Journal is issued in electronic form and also issued in printed form as annual volume for the contributors only. The journal contains original research papers, review articles, short notes and letters to the editors. The topics of interest include modeling, experimental, analytical and numerical investigations on the mechanical, physical, chemical and mineralogical properties of material, developing the prototype/instrument, technology and construction process. Topic of management in industry and civil construction is also considered. SEMESTA TEKNIKA receives manuscripts from the contributor written in the Indonesian and English. Manuscripts submitted to the journal for publication must not have been previously published or is under consideration simultaneously by any other publication. Manuscripts submitted to SEMESTA TEKNIKA will be reviewed Peer Reviewers local and foreign.
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Articles 715 Documents
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Analisis Lentur Balok Penampang T Berlubang Memanjang Menggunakan Metode Elemen Hingga Non-linier Praganif Sukarno; Muslikh "."; Djoko Sulistyo
Semesta Teknika Vol 14, No 1 (2011): MEI 2011
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v14i1.563

Abstract

Numerical analysis is a time-, cost- and equipment-effective method to study the behavior of structures. ATENA is one of the available software-based on finite element method. Hollow cross section is one way to reduce the weight of concrete beam. The effect of holes on beam may reduce the bending resistance. The hollow beam was numerically modeled which and subsequently analyzed using the ATENA v.2.10 software. Material parameters being used as input data was obtained from laboratory tests, assuming that steel-concrete bond was prefect, and and the steel reinforcement was modeled as discrete. The results of numerical analysis of the ATENA were then compared with experimental test results on the flexural behavior and serviceability limit state of reinforced concrete hollow beams lengthwise (Amir, 2010), then study the variation of quality parameters of concrete and the hole size variations. The results shows that the collapse load of hollow beam reached only 96.71% and deflection reached 135.96%. Stiffness of hollow concrete beam was also showed a higher stiffness of the experiment. The crack pattern is flexural fracture and very much agree with that of the experiments. Test parameters of concrete quality variations as well as the hole size variation showed higher concrete quality/size of the hole will reduce the ductility of beam.
Deteksi Kavitasi Berbasis Getaran Pada Pompa Sentrifugal Menggunakan Principal Component Analysis (PCA) Kamiel, Berli Paripurna; Kausar, Ikhsan Aprima
Semesta Teknika Vol 21, No 2 (2018): NOVEMBER 2018
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.212219

Abstract

A centrifugal pump is one type of pumps that widely used in industries. Its mechanism which creates pressure changes may cause cavitation. Cavitation phenomenon that is not properly maintained may results fatal breakdown leading to high economic losses. Therefore, research is needed to find and develop a method that can detect early cavitation phenomena and identify it at several levels as well. This paper presents a method that can detect cavitation by monitoring the vibrations level of the pump based on statistical analysis of time domain and Principal Component Analysis (PCA). Vibration data is collected, trained and tested for each cavitation level. Training data is normalized and trained for each cavitation level using PCA which produces data loading matrix. The loading matrix is then multiplied by the testing data which gives a score matrix used to classify cavitation level of the centrifugal pump. The result shows that the method of domain-based PCA is successful in transforming the original data of 7 statistical parameters to 7 principal components (PC) with maximum variant. Three PCs gives 93.68% variants which can clearly identify and classify the differences between normal, early, intermediate and fully developed cavitation in the centrifugal pumps.
Analisa Korosi Atap Aluminium Tipe Kulit Jeruk Tebal 0,8 mm Bambang Riyanta; Ade Rahmatullah
Semesta Teknika Vol 8, No 1 (2005): MEI 2005
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v8i1.911

Abstract

ABSTRACTPenelitian ini dilakukan untuk mengetahui  kasus rusaknya atap plat aluminium gelombang tipe kulit jeruk dengan ketebalan 0,80 mm yang dipesan PT. Amann Jaya di Teluk Betung Selatan Lampung dari PT. Alka Jaya di Jakarta, Plat aluminium tersebut mengalami  kerusakan yaitu timbulnya bercak abu-abu kehitaman yang diduga rusak dikarenakan tutup plastik robek  sehingga basah oleh  air hujan pada waktu pengiriman melalui cargo darat. Oleh karena itu diadakan beberapa pengujian untuk mengetahui timbulnya kerusakan yang terjadi pada pelat aluminium tersebut, pengujian yang dilakukan diantaranya adalah uji komposisi kimia, uji struktur mikro,uji visual, uji fraktografi, dan uji kelembaban. Setelah diadakan beberapa penelitian diatas dapat diketahui bahwa Jenis korosi yang terjadi adalah  korosi sumuran . Plat aluminium tidak rusak karena air hujan pada waktu pengiriman melalui cargo darat melainkan akibat bahan baku terendam banjir sebelum plat mengalami proses pengerolan .
Dampak Parkir Khusus Wisata Terhadap Simpang Bersinyal Jalan Perkotaan: Studi Kasus Persimpangan Ngabean, Yogyakarta Noor Mahmudah; Adhytia Tubagus
Semesta Teknika Vol 18, No 1 (2015): MEI 2015
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v18i1.705

Abstract

The development of Special Region of Yogyakarta has been occuring rapidly due to this region is well known as student city and the primary tourism destination in Indonesia. One of the transportation problems related to the tourism activities is traffic conflict due to parking area of tourism bus in Ngabean, Yogyakarta City. Therefore it is needed to evaluate signalized junction around the parking area in order to reach the optimal performance. The study carried out among other by conducting field survey to the existing condition (performance) of signalized junction either in the weekend (Saturday) and weekday (Monday), especially by evaluating the degree of saturation (ds). The analysis results showed that the degree of saturation in the weekend is 0,89, which is higher than the allowed one (ds=0,85). Since the degree of saturation in the weekday is 0,76 so it is relatively good. The scenarios (model) applied to improve the overall junction performance are by estricting (prohibiting) left turning on red (LTOR) and by carrying out road widening. The final result obtained from the scenario (model) is the degree of saturation (ds) becomes lower than the allowed value (0,830,85) for all approaches in the signalized junction. 
Penerapan Algoritma Cosine Similarity pada Text Mining Terjemah Al-Qur’an Berdasarkan Keterkaitan Topik M Didik Rohmad Wahyudi
Semesta Teknika Vol 22, No 1 (2019): MEI 2019
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.221235

Abstract

AbstrakAl-Qur’an merupakan sumber hukum dan panduan dalam pemecahan berbagai masalah umat Islam dalam menjalani kehidupan beragama, bermasyarakat, dan bernegara. Pemecaham masalah di dalam Al-Qur’an tidak hanya mengacu pada satu atau dua ayat. Jumlah ayat dan surat Al-Qur’an yang sangat banyak menyebabkan pencarian suatu ayat Al-Qur’an menggunakan cara konvensional akan memerlukan waktu lama. Oleh karena itu, dibutuhkan sebuah sistem untuk mengenali, mencari topik, dan mengelompokkan suatu permasalahan. Pencarian topik dalam terjemahan Al-Qur’an merupakan salah satu penerapan dari metode klasifikasi pengelompokan teks yang melakukan proses secara otomatis menempatkan dokumen teks ke dalam suatu kategori berdasarkan isi teks tersebut. Pengelompokan terjemah ayat Al-Qur'an berbahasa Indonesia dapat dilakukan berdasarkan tingkat kemiripan antar ayat. Algoritma yang bisa dipergunakan dalam permasalahan ini adalah Cosine Similarity. Algoritma ini akan menghitung tingkat kemiripan antar ayat yang akan menghasilkan beberapa kelompok ayat yang diambil untuk dibandingkan dengan index Al-Qur'an. Hasil penelitian menunjukkan bahwa tingkat kemiripan antar ayat sebesar 20% memberikan hasil terbaik pada pengelompokan index Al-Qur’an rata-rata sebesar 46,42%. Tingkat kemiripan antar terjemah ayat Al-Qur’an sebesar 40% memberikan rata-rata sebesar 15, 39% pada pengelompokan index Al-Qur’an. Untuk tingkat kemiripan antar ayat diatas 40%, ada kelompok similaritas ayat yang tidak masuk dalam index Al-Qur’an.AbstractAl-Qur’an as a Muslim holy book, contains life guidance and instructions on how to solve various problems faced by humans on earth. The Qur'an also discusses how life after death fetches every human being. The Qur'an has specific methods in grouping specific themes or problems. There are groupings based on the themes of the stories of previous people, groupings based on verses, juz, and groupings based on the place where the verses or letters of the Qur'an are revealed. In-text mining, grouping a text object can be done in various ways. One of them is based on the level of similarity. This text grouping method, of course, can be implemented in the Qur'an to find out specific patterns. The grouping of Indonesian verses in the Qur'an can be based on the level of similarity between verses using the Cosine Similarity algorithm. This algorithm will calculate the level of similarity between verses. This process will produce several groups of verses that will be taken to compare with the index of the Qur'an. The results showed that the similarity between verses was 20%, giving the best results with an average of 46.42%. The highest level of similarity where each group can still be included in the Al-Qur'an index is 40% with an average of 15, 39%. For the level of similarity between verses above 40%, there is a similarity group of verses that are not included in the Qur'anic index.
Classification of Student Majors with C4.5 and Naive Bayes Algorithms (Case Study: SMAN 2 Bekasi City) Antonius Yadi Kuntoro; Hermanto Hermanto; Taufik Asra; Ferry Syukmana; Hermanto Wahono
Semesta Teknika Vol 23, No 1 (2020): MEI 2020
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v23i1.7381

Abstract

School majors conducted in high school are based on interests and these have a goal to provide opportunities for learners to develop the competence of attitudes, skills competence of learners in accordance with interests, talents, and academic ability in a group of scientific subjects.In this research, the researcher uses two algorithm models that is a comparison between the C4.5 algorithm and also the Naive Bayes algorithm. In this study, the data used is the results of school entrance test data and also the data from psychological results for students who have been declared passed the entrance test school SMAN 2 Bekasi City academic year 2018/2019. By comparison of two data mining classification algorithm, can be proved with accuracy result and AUC value from each algorithm that is for Naive Bayes accuracy = 76,43% and AUC value = 0,846, while for algorithm C4.5 accuracy = 70,29% and AUC value = 0.738.
Evaluasi Kinerja Gedung Apartemen 10 Lantai dengan Ketidakberaturan Horizontal Novi Rahmayanti; Havri Yumna Labiba
Semesta Teknika Vol 24, No 1 (2021): MEI 2021
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v24i1.11676

Abstract

Force Based Design (FBD) dan Direct Displacement Based Design (DDBD) merupakan metode yang umumnya digunakan untuk merencanakan bangunan gedung, namun metode DDBD belum familiar digunakan. Penelitian lebih lanjut dibutuhkan pada Metode DDBD dengan gedung yang memiliki ketidakberaturan horizontal, karena terdapat berbagai variasi kekakuan portal. Hal ini berbeda dengan bangunan biasa dengan kekakuan yang relatif sama. Penelitian ini dilakukan untuk mengetahui keandalan hasil desain dengan metode DDBD pada bangunan gedung dengan ketidakberaturan horizontal sudut dalam bentuk U terhadap metode FBD berdasarkan SNI 1726 (2012). Perencanaan metode FBD menurut SNI 1726 (2012) dilakukan dengan analisis statik ekuivalen dan analisis respon struktur. Parameter yang dibandingkan dalam penelitian ini meliputi gaya geser dasar, perpindahan, simpangan antar tingkat, jumlah tulangan dan tingkat kinerja struktur menurut ATC-40. Hasil penelitian menunjukan bahwa metode DDBD menghasilkan gaya geser, perpindahan, simpangan antar lantai dan kebutuhan tulangan paling besar. Dibandingkan dengan dua metode yang lain, namun tingkat kinerja yang didapatkan dari ketiga metode sama yaitu Damage Control (DO).
Pemilihan Mesin Welding Otomatis Dengan Penerapan Value Engineering Dan Analitical Hierarchy Process Moch Nuruddin; Deny Andesta
Semesta Teknika Vol 11, No 1 (2008): MEI 2008
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v11i1.791

Abstract

By chosening machine of welding automatic with Value Engineering, hence company can know which machine is which have high value and can improve production process specially to part of welding. With quality, quality of product which different each other hence consumer have to be clever in assessing and chosening reliable product. Because many company promoting its product with advertisements, so that make consumer interest to buying. This research aim to look for and analyse some alternative which can be made size measure in chosening machine of welding reliable automatic. Election of merk here there is three merk type for example Panasonic, Daihen, and Hitachi. From third this merk type will be selected which merk which have best quality. Result of got calculation, hence machine merk the selected is merk of Hitachi because this machine have high value and difference is expense of Rp 35 million compared to two other alternative. this Volts machine Pri equal to 380V, input pri 42,5KVA 23,5KW and current output 500A. If compared to this machine alternatives have value of Vn equal to 2,1.
Pembuatan Alat Uji untuk Mengikat Partikel Logam yang Terkandung dalam Pelumas Akibat Gesekan Mesin Sukamta Sukamta; Sudarja Sudarja; Nurdarojat Nurdarojat; Agung Prasetyo
Semesta Teknika Vol 17, No 2 (2014): NOVEMBER 2014
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v17i2.422

Abstract

One of the factors that can affect to the quality of lubricantion is metal particle content due to friction of engine parts.  Metal particle in lubricanting oil could damage the engine parts, so it is neccessary to reduce the metal particle content which mingled in lubricant oil. The experiment was conducted in laboratory scale using power magnetic type ring neodymium possessing diameter of 19 mm and thickness of 2 mm. The experiment was conducted by flowing the lubricanting oil containing metal particle continually and put the magnets in engine so that the metal particle will be taken up by the magnets. The experiment used  three variations of time (5, 10 and 15 minutes) and three variations of valve to controlling the flow rate using. The highest  absortion of metal  particle was reached on opening valve 30 for 15 minutes. When volume the flow rate was 200 ml/s and the time was 15 minutes  the result of absortion was 7.48 % (magnet A), meanwhile for volume the flow rate 180 ml/s and the time was 15 minutes resulted in particle absortion of about 7.37 % (magnet B). When Magnet A and B used together and at the same flow rate and time, i.e. 180 ml/s time 15 minutes, resulted the particle absortion about 17.98 %.
Perubahan Kecepatan Aliran Sungai Akibat Perubahan Pelurusan Sungai Edy Sriyono
Semesta Teknika Vol 10, No 1 (2007): MEI 2007
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v10i1.851

Abstract

Penelitian ini bertujuan untuk mengkaji pengaruh permeabilitas tanah (k), tinggi muka air (h), diameter pipa (D), panjang pipa (L), kedalaman pipa (l), dan luas pori (Af) terhadap debit aliran melalui pipa berpori (Q). Selain itu juga bertujuan untuk menentukan formula empirik hasil analisis dimensi debit aliran (Q) yang melalui pipa berpori.Penelitian dilakukan dengan cara membuat eksperimen fisik di laboratorium yang terdiri dari bak penelitian yang terbuat dari pasangan batu bata dan pipa berpori (jumlah pipa berpori seluruhnya 9 buah), yang kemudian diisi dengan pasir dan air pada berbagai macam variasi, kemudian besarnya debit aliran melalui pipa berpori diukur dengan gelas ukur.Hasil penelitian menunjukkan bahwa beberapa parameter yang berpengaruh secara signifikan terhadap debit (Q) adalah: permeabilitas tanah (k), diameter pipa berpori (D), panjang pipa berpori (L), kedalaman pipa berpori (l), luas pori (Af), dan ketinggian air di atas pipa berpori (h).Q = f (k, Af, L, l, D, h)Adapun formulasi empirik debit yang mewakili hubungan antara Q/k.L.D dengan Af.h/L.D.l adalah sebagai berikut ini. 

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