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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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Deteksi Kecacatan Permukaan Buah Manggis Menggunakan Metode Deep Learning dengan Konvolusi Multilayer Azizah, Laila Marifatul; Umayah, Sitti Fadillah; Fajar, Febriyana
Semesta Teknika Vol 21, No 2 (2018): NOVEMBER 2018
Publisher : Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.212229

Abstract

Mangosteen is one of Indonesian potential export fruits. Nevertheless, mangosteens quality is compulsary. A good quality fruit surface is needed in export fruit. This is the reason of this research to detect the flaw in rind surface, particularly mangosteen. Some researcher has been done many type of image processing for fruit detection. However, there aren’t any research for mangosteen rind detection especially used Deep Learning. This research used CNN (Convolutional Neural Network) as deep learning method to detect mangosteen rind surface. Our research is to find configuration which was the best accurancy value. The rind detection calcuted between epoch and layer to obtain maximum accurancy value. This method achieved maximum value by parameter 4 layer and epoch value of 30. From our experiment, the test result for rind detection was 98% accurancy.
Pengaruh Mode Shape Frekuensi Alami terhadap Estimasi Gaya Tarik Batang Baja dengan Metode Vibrasi Nugroho, Guntur
Semesta Teknika Vol 21, No 2 (2018): NOVEMBER 2018
Publisher : Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.212226

Abstract

The vibration method has been widely applied to estimate the force on cable structures as well as beams. This method utilizes the natural frequency of structural elements in estimating tensile as well as compressive forces. On the cable element, a different natural frequency will appear according to the shape number. This study raises the suitability of force estimation by using the natural frequency of the first second and third modes. The steel specimen have cross section of width, thickness and length of 6 mm, 40 mm and 2000 mm respectively. The results of natural frequency, calculated by using analytic formulas (string, beam-string and stokey) has been compared with the natural frequency resulted by numerical modeling. The difference of  natural frequency of specimen calculated by using analytic formulas (strings, beam-strings, stokey), compared with the result of numerical modeling  has the smallest value in the first mode which is 3.75% at 5,000N load and 0.61% at 50,000N load.
Degradasi Mekanik Beton Mutu Tinggi Pasca Bakar Hamdi, Fauzan; Zainuddin, Muh Amir; Gaffar, Farida
Semesta Teknika Vol 21, No 2 (2018): NOVEMBER 2018
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Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.212230

Abstract

Research on the effect of temperature on concrete is still a hot topic. The effect of temperature was measured on its mechanical properties and analyzed using descriptive statistical analysis. The desire of researchers to know accurately the shape, description, and influence of temperature on concrete is something that still needs further research. The researchers began to research by making concrete test objects which were then burned directly in the furnace. After that, testing is done on the test object in the form of compressive strength. The research that was carried out was the remains of a burning building. But so far the assessment research has not yet found a strong starting point. Broadly speaking, the problem examined in this study is that researchers want to know the magnitude of high quality concrete mechanical degradation after being burned at a certain temperature and compared with high quality concrete that is not burned. These results are expected to provide a basis for the repetition of buildings that use high quality concrete that has been burned. The results of the mechanical degradation test reviewed were the average compressive strength of high quality concrete at a normal temperature of 53.46 MPa, a temperature of 100oC of 34.93 MPa, a temperature of 300oC of 29.76 MPa, a temperature of 600oC of 25.57 MPa.
Simulasi CFD Aliran Stratified Air-Udara pada Pipa Horisontal Sukamta, Sukamta; Thoharudin, Thoharudin; Nugroho, Dedy Melianto
Semesta Teknika Vol 21, No 2 (2018): NOVEMBER 2018
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Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.212227

Abstract

Two-phase flow can be found in industries, such as petroleum, electricity generation. In geothermal power plants, two-phase flow occurs from a mixture of water and steam which should be avoided in the piping system because it can cause equipment damage in the operating system. Therefore, an operator and engineer need a knowledge of flow patterns, phenomena and characteristics of the two-phase flow. One of the methods to predict the flow pattern is ud\sing the Computational Fluid Dynamic (CFD). This CFD simulation was modeled using Ansys Fluent 15.0 software to determine the changes of Stratified flow characteristics. The model used is Volume of Fluid (VOF). The fluid type is water and air. The variation of superficial water velocity JL of 0.025 m/s - 0.1 m/s while the superficial air velocity (JG) of 0.05 m/s - 1 m/s. The pipe used is an acrylic of 19 mm diameter and length of 1000 mm. The simulation results show that: (1). Stratified flow occurred for the low velocity of the liquid and gas phases. It was shown by the water and air are clearly separated. (2). Flow patterns are not stable, but it can change depending on the superficial velocity of gas and water. (3). The larger of JG causes the wave height because of Bernoulli’s effect so that it will make the stratified wavy or ripple flow pattern. (4). The frequency of stratified-wavy and ripple waves will tend to decrease when the JL increases, while the effect of JG is insignificant. Furthermore, it can be concluded that the speed of gas must be regulated so as not too large to the speed of water.
Perancangan dan Pembuatan Website Pengambilan Ide Skripsi Pada Prodi Teknik Informatika UMY Kurnianti, Apriliya; Setyawan, Haris; Firdaus, Fathania Firwan; Yuma, Safira Nira
Semesta Teknika Vol 21, No 2 (2018): NOVEMBER 2018
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Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.212228

Abstract

In the Kamus Besar Bahasa Indonesia (KBBI), Idea is a design arranged in mind. The thesis idea is a design that can come from thought of student and lecturer. In the Informatics Engineering Department at  Muhammadiyah University of Yogyakarta, thesis idea is often offered to student by several lecturers through social networking forums or instant messaging. Thesis ideas was offered through social networking forum or instant messaging can be covered by other content quickly, thus  the information was not delivered to students who need a thesis idea optimally . The effect was some students were still confused to get thesis ideas and lecturers who had thesis ideas did not know that there were still students whom needed the idea. To overcome this case, a website-based thesis idea taking system was built to help students to get information and to take thesis ideas which was given by lecturers. In building or repairing a website, Researcher used the waterfall method. Using this method, website development will be more organized. Website development used PHP programming language with CodeIgniter framework. Researcher Tested through three steps, i.e. user interface, functionality and validation testing.
Analisis Panjang Runway untuk Pendaratan dan Take-off Pesawat Airbus A330-200 dan A330-300 Setiawan, Dian M; Mahmudah, Noor; Putra, Edo Laksmana
Semesta Teknika Vol 22, No 1 (2019): MEI 2019
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Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.221233

Abstract

AbstrakOtoritas Bandara Radin Inten II merenovasi bandara mulai dari memperpanjang landasan pacu serta memperluas apron dan bangunan terminalnya. Landasan pacu diperpanjang dari sebelumnya 2.500 m menjadi 3.000 m. Pengembangan ini dilakukan karena Bandara Radin Inten II dipilih menjadi embarkasi haji penuh dan juga karena adanya potensi peningkatan aktivitas bandara setiap tahunnya. Bandara juga harus mampu mengakomodasi pesawat Airbus A330-200 dan A330-300 untuk meningkatkan kapasitas penumpang. Penelitian ini dilakukan dengan mengevaluasi kondisi yang ada dari Bandara Radin Inten II dan menganalisis apakah landasan pacu di Bandara Radin Inten II dapat mengakomodasi Airbus A330-200 dan A330-300. Hasil analisis menunjukkan bahwa terdapat peningkatan yang signifikan dalam kegiatan penumpang dan kargo. Selanjutnya, Bandara Radin Inten II dapat melayani jenis pesawat Airbus A330-200 dengan panjang landasan pacu yang dibutuhkan 2.753 m untuk pesawat tersebut, sedangkan pesawat A330-300 tidak dapat dilayani karena pesawat ini membutuhkan panjang landasan 3100 m untuk lepas landas dan mendarat dengan aman.AbstractThe 2nd Radin Inten Airport authorities renovate its airport starting from extending the runway as well as expanding the apron and its terminal building. The runway was extended from previously 2,500 m to 3,000 m. The development was due to the 2nd Radin Inten Airport was chosen to become a full hajj embarkation and also due to a potential increase in airport activity every year. The airport also must be able to accommodate the Airbus A330-200 and A330-300 aircraft to increase passenger capacity. The study was conducted by evaluate the existing conditions of the 2nd Radin Inten Airport and analyse whether the runway at the 2nd Radin Inten Airport can accomodate the Airbus A330-200 and A330-300. The results of the analysis showed that there were significant increases in the passenger and cargo activities. Furthermore, 2nd Radin Inten Airport can serve Airbus A330-200 aircraft types with the required runway length of 2,753 m for such aircraft, while the A330 aircraft -300 unable to be served because this aircraft requires 3,100 m runway length in order to take-off and landing safely.
Recommendation of Knockdown Building Design at Yogyakarta Sand Dunes (Restricted and Heritage Areas) Bhaskara, Adwitya; Nugraheni, Fitri; Hanafi, N. Faried
Semesta Teknika Vol 22, No 1 (2019): MEI 2019
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Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.221239

Abstract

Sand dunes located in Special Region of Yogyakarta Indonesia is a restricted caused by the heritage and there only four spread in hemisphere one of them in Yogyakara, Indonesia. To build in sand dunes area building could not be built arbitrarily. Portable and knockdown is the character of the building that could be adjust to the conditions in Sand dunes. By the observation results compact building design with cold formed steel material for the main building material is the recommendation of this case. The design is then consulted with sub-contractors who are expert in their expertise as the validation stage, it is feasible to be transformed into a real building for the specific needs. Output of this research is recommendation of portable building model in modular form, where the design recommendation has been adjusted with building requirement in heritage and restricted area, which is also an area prone to tsunamis and wind disasters, therefore the recommended building are; easy to remove, easy to disassemble (knockdown), forward tsunami load, efficient cost and time (using cold formed steel material and prefabricated GRC), eco friendly (zero waste), does not require many workers (less man power).
Kajian Kadar Lumpur pada Model Infiltrasi Buatan dengan Variasi Kemiringan Tanah dan Tanaman Supriatna, Usep
Semesta Teknika Vol 16, No 2 (2013): NOVEMBER 2013
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Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

From various soil conditions, there are need some efforts to restore soil functions as a water absorbent that is expected to reduce the excessive surface runoff indirectly and to increase infiltration. The purpose of this study was to calculate Total Suspended Solid (TSS) level on artificial infiltration model using the three media (grassland, krokot land, and vacant land) with the variation slope of 5°, 10°, 15° and 20°. This research also to understand the influence of soil media variety and land slope on TSS of artificial infiltration model. This research was carried out by preparing an artificial wood model with size 200 cm x 150 cm x 100 cm, which was then divided into three parts with each of them is 200 cm x 50 cm x 100 cm and used for soil media placement. The discharged water used in all three media was the same that is equal to 0.237?/sec. For the results representative in each study, 100 m? of water samples can be taken in the runoff on the model for each soil media and then immediately examined the levels of TSS in the laboratory. According to the variation slope, the results of the research showed that the TSS on the grass soil media was 4700 mg/?, 9200 mg/?, 9500 mg/? and 10 000 mg/?. For krokot soil, the TSS was 6500 mg/?, 66000 mg/?, 126000 mg/? and 273 900 mg/?, while for vacant land was 5100 mg/?, 101500 mg/?, 109500 mg/? and 243600 mg/?. Furthermore, the steeper the lands slope, the higher TSS.
Analisis Kapasitas Apron dan Ruang Tunggu Keberangkatan Penumpang Pesawat pada New Yogyakarta International Airport Setiawan, Danny
Semesta Teknika Vol 22, No 1 (2019): MEI 2019
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Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.221234

Abstract

AbstrakDalam mengantisipasi terjadinya keterbatasan lahan dan kapasitas penumpang seperti pada Bandar Udara Adisutjipto, maka perlu dilakukan analisis kebutuhan luas lahan ditahun yang akan datang, terutama aktivitas penerbangan di apron (sisi udara) dan ruang tunggu keberangkatan penumpang bandara (sisi darat) pada New Yogyakarta International Airport (NYIA). Metode yang digunakan pada penelitian ini adalah ICAO (International Civil Aviation Organization) dan metode forecasting. Hasil penelitian menunjukkan bahwa kapasitas apron yang direncanakan pada tahun 2046 dapat mengakomodasi 37 pesawat, dengan langkah optimalisasi melalui penerapan Gate Occupancy Time (GOT) yaitu sebesar 30-40 menit. Kebutuhan luas ruang tunggu keberangkatan NYIA pada tahun 2046 dengan kapasitas sebesar 24.163.371 penumpang adalah 10.706 m², jumlah kursi yang dibutuhkan sebesar 2.212 unit, kebutuhan gate hold room sebesar 13.272 m², dengan jumlah gate mencapai 39 unit. AbstractIn anticipating the occurrence of limited land area and passenger capacity such as at Adisutjipto Airport, it is necessary to analyze land area requirements in the coming year, especially the flight activities at the apron (airside) and airport passenger departure lounge (landside) for the New Yogyakarta International Airport (NYIA). The method used in this research is ICAO (International Civil Aviation Organization) and forecasting methods. The results of the study show that the apron capacity is planned to accommodate 37 aircraft by 2046, with optimization steps through the application of Gate Occupancy Time (GOT) of 30-40 minutes. The need for NYIA departure lounge area in 2046 with a capacity of 24,163,371 passengers is 10,706 m², the number of seats needed is 2,212 units, the needs of the gate hold room area required area is 13,272 m² with the number of gates reaching 39 units.
Perbandingan Fasilitas Penunjang Kesiapsiagaan SD, SMP, dan SMA Terhadap Bencana Gempa Di Kota Yogyakarta Tri nugroho, Fajar kabisatyo
Semesta Teknika Vol 22, No 1 (2019): MEI 2019
Publisher : Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.221240

Abstract

AbstrakGempa bumi merupakan salah satu bencana yang paling dahsyat dan datang dengan tiba-tiba, yang dapat menghancurkan bangunan dalam waktu singkat. Catatan sejarah menunjukkan bahwa Jawa Tengah dan Daerah Istimewa Yogyakarta sering mengalami gempa bumi. Gempa tektonik berkekuatan di atas 6 Richter Scale (RS) dan bahkan di atas 7 RS terjadi pada 1867, 1943, 1981, 2001 dan terakhir terjadi pada Sabtu, 27 Mei 2006. Di Kota Yogyakarta, terdapat 27 bangunan sekolah yang rusak akibat gempa 27 Mei. Penelitian ini bertujuan untuk mengevaluasi sarana dan prasarana sekolah untuk mendukung kesiapsiagaan bencana serta untuk mengetahui tingkat kesiapan sekolah terhadap bencana gempa 2006. Metode penelitian menggunakan likert scale dan diproses menggunakan Ms. Excel dan SPSS sedangkan pengumpulan data dilakukan dengan penilaian langsung di sekolah. Hasil penelitian menunjukkan bahwa 50,63% dari 90 sekolah di Kota Yogyakarta tidAK memiliki fasilitas penunjang kesiapsiagaan bencana, 15,45% memiliki fasilitas penunjang namun tidak sesuai standar atau tidak layak, sisanya sebesar 33,9% memiliki fasilitas penunjang dan sesuai standar.AbstractEarthquakes are one of the most devastating natural disasters and come suddenly, this disaster can destroy buildings in a short time. Central Java and the Special Region of Yogyakarta in historical records have often experienced earthquakes, recently tectonic earthquakes of magnitude above 6 Richter Scale (RS), and some even reach more than 7 RS, which occurred in 1867, 1943, 1981, 2001 and the last occurred on Saturday, May 27, 2006. In Yogyakarta city itself, there are 27 school buildings damaged by the 27 May earthquake. This study aimed to evaluate school facilities and infrastructure to support earthquake disaster preparedness and find out the level of school readiness 2006 earthquake disaster. The research method used likert scale and processed using Ms.Excel and SPSS, data colleting use direct assessment at school. The results  show form 90 schools in the city of Yogyakarta showed 50.63% of the schools did not have disaster preparedness support facilities, 15.45% had facilities but were not standard or not feasible, the remaining 33.9% owned facilities and according to standards

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