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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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Pemanenan Air Hujan Menggunakan Ground Water Tank untuk Pemenuhan Air Baku Di Lokasi Bangunan Perkuliahan (Lokasi Penelitian : Kampus 3, UM Purworejo) Riyanto, Eko; Setiawan, Agung
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.v23i1.8535

Abstract

Kampus 3 (tiga) Universitas Muhammadiyah Purworejo yang beralamat di Jalan Lingkar Barat Purworejo tepatnya di Desa Sucen, Kecamatan Bayan, Kabupaten Puworejo merupakan gedung perkuliahan untuk Fakultas Ekonomi, Universitas Muhammadiyah Purworejo, dengan demikian kebutuhan air bersih untuk mahasiswa dan dosen di kampus tersebut relatif cukup banyak. Waktu musim hujan volume air berlebih menyebabkan limpasan air permukaan menjadi meningkat  terutama di sekitar kampus sedangkan pada musim kemarau terjadi kekurangan air. Sehingga merancang  tampungan air hujan sangat diperlukan untuk tampungan air sehingga air hujan tidak terbuang sia-sia dan dapat digunakan pada musim kemarau. Penelitian ini menggunakan data perhitungan hujan kawasan  merujuk pada teori Polygon Thiessen  serta menggunakan data curah hujan andalan 80%, kemudian mengenai intensitas hujan digunakan teori tentang mononobe, sedangkan perancangan desain dan elemen pendukung tangki penampung air hujan digunakan standar ketentuan dari Kementerian Pekerjaan Umum dan Perumahan Rakyat tahun 2014, tentang Diseminasi Standar dan Manual Penampung Air Hujan. Hasil penelitian menunjukan potensi volume suplai air hujan didapatkan sebesar  976,99 m³/ tahun, dan penghematan air sebesar 0,76 % dari total kebutuhan air gedung perkuliahan sebesar 86.400 m³/ tahun. Perhitungan RAB tangki didapatkan sebesar Rp. 93.998.000,00 untuk dimensi tangki tampungan air hujan sebesar 8 x 5 x 3 m.                    Campus 3 (three) Muhammadiyah University Purworejo which is located at Jalan Lingkar Barat Purworejo, precisely in Sucen Village, Bayan District, Puworejo Regency is a lecture building for the Faculty of Economics, Muhammadiyah University of Purworejo, thus the need for clean water for students and lecturers on the campus is relatively sufficient. Lots. During the rainy season the excess water volume causes surface water runoff to increase, especially around the campus, while in the dry season there is a lack of water. So that designing rainwater storage is very necessary for water storage so that rainwater is not wasted and can be used in the dry season. This study uses regional rainfall calculation data referring to the Polygon Thiessen theory and using 80% reliable rainfall data, then regarding the rain intensity the mononobe theory is used, while the design design and supporting elements of rainwater storage tanks are used as standard provisions from the Ministry of Public Works and Public Housing. 2014, concerning Dissemination of Standard and Manual of Rainwater Storage. The results showed that the potential volume of rainwater supply was 976.99 m³ / year, and water savings of 0.76% of the total water demand for the lecture building was 86,400 m³ / year. The calculation of the RAB for the tank is Rp. 93,998,000.00 for the dimensions of the rainwater storage tank of 8 x 5 x 3 m. 
Analisis Indeks Kekeringan Meteorologis di Bagian Utara Kabupaten Lumajang Radiah Ulil Absari; Gusfan Halik; Wiwik Yunarni Widiarti
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.v24i1.11089

Abstract

Kekeringan merupakan salah satu masalah yang memiliki dampak terbesar dari seluruh bencana alam di dunia. Kekeringan terjadi akibat berkurangnya ketersediaan air sehingga berdampak pada kebutuhan sumber daya air, sektor pertanian dan lingkungan. Saat musim kemarau di Kabupaten Lumajang bagian utara seringkali mengalami kekurangan air bersih khususnya pada saat musim kemarau. Hal ini yang menjadi dasar penelitian ini untuk memitigasi kekeringan yang terjadi di Kabupaten Lumajang bagian utara. Metode yang digunakan adalah Standardized Precipitation Index (SPI) dimana data masukannya adalah data curah hujan dari tahun 2000 hingga 2019. Hasil dari perhitungan indeks kekeringan diolah untuk mendapatkan peta sebaran kekeringan pada 6 tahun terakhir. Hasil dari studi ini menunjukan bahwa SPI-12 memiliki kesesuaian dengan data dropping air bersih sehingga nilai indeks kekeringan SPI-12 digunakan untuk mendapatkan peta sebarannya. Pada perhitungan SPI-12, kekeringan tertinggi terjadi pada bulan September 2018 dengan nilai -1,89 (sangat kering) dan hasil sebaran kekeringan pada tahun 2018 didominasi oleh status sangat kering dan hanya sebagian kecil mengalami kondisi kering.
Sistem Pengenal Wicara Menggunakan Mel-Frequency Cepstral Coefficient Karisma Trinanda Putra
Semesta Teknika Vol 20, No 1 (2017): MEI 2017
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v20i1.2358

Abstract

Human-machine interaction evolves toward a more adaptive and interactive system. There are several media that can be used in human-machine interaction systems, such as voice signals. The process includes converting analog signals into the appropriate meaning, which depend on the noise and reliability of signal characteristic extraction methods. In fact, variations of pronunciation by different people will result in a diversity of voice signal patterns. This research develops technology that can recognize and translate speech according to data that has been trained and can be modified based on user requirement. The voice signal will be separated from the silent signal using voice activity detection. Then, the voice signal is converted to the frequency domain before it is extracted using mel-frequency cepstral coefficients. Cepstral value from MFCC extraction will be identified as words using artificial neural network. This study utilizes a computer with a microphone as a sound recording device and pascal programming language as the basis for building applications. Based on the experimental results, the accuracy is 87% on the speech recognition process with 28 vocabulary sets. Accuracy decreases with more sets of vocabulary. However, the more pronounced speech variations, the greater the accuracy with an average number around 93%.
Pengaturan Lalulintas Kereta Api di Stasiun Cicalengka untuk Mendukung Pengoperasian Jalur Ganda Kereta Api Bandung-Cibatu Dian Setiawan M; Rahardhita Luthfiana Devi P; Sri Atmaja P Rosyidi
Semesta Teknika Vol 21, No 1 (2018): MEI 2018
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.211205

Abstract

Indonesian Railway Authority plans to build a double railway track between Bandung-Cibatu which is currently the densest service line in Bandung Regency. Cicalengka Station is one of the major stations in this line service. This study aims to plan the train traffic arrangement at Cicalengka Station. The Conflict Rate Matrix Table was used as a simple simulation method to analyse the train journey route (formed, used, conflicted) and the degree of route usage against train frequency. The results showed that the Cicalengka Station on double track system would be passed by 98 passenger trains and planned to have two primary track (II and III) which are used for the direct train journey through the station. Track I, IV, V, and VI are the siding tracks that used for a railway stop. Cicalengka Station is also planned to have a route that is formed and is used each amounted to 10 routes (A to J). The conflict degree is 0.84, and the degree of route usage against train frequency is 0.75. Furthermore, it can be concluded that the percentage of non-conflicted route increased from 16% to 25%.
Pembuatan Aluminium Berpori dengan metode Metalurgi Serbuk Berbahan Amonium Hidrogen Karbonat ((NH4)HCO3) sebagai Space Holder beserta Karakterisasinya Aris Widyo Nugroho; Iswanto Iswanto
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.212220

Abstract

The reseacrh on fabrication of porous aluminum using powder metallurgy technique with amonium hidrogen karbonat as space holder has been carried out. The space holder powder with various space holder mass fraction of 20%,30%, 40% and 50% in 5 gram of total mass and the aluminum powder were put into a can for mixing process. Afterward the mixed powder was compacted at 300 kg/cm2 to obtain the green body. Density of the green body was then determined by measuring its dimension and the mass. Following this, the green body was put in a furnace and heated up to 200oC with holding time of 60 minutes for space holder removal. The second heating up was carried out up to 650oC with holding time of 60 minutes for sintering process and the furnace was then switched off for cooling. Porosity of the sintered porous aluminum was calculated and its microstructure was examined using an optical microscop. The compressive strength of the porous material was evaluated using universal testing machine. The result show that the porosity increases with an increase of the mass fraction in the range of 56-74% with the compressive strength in opposite way. The strength was found in the range of 1.2-15.7 MPa. All specimens show a typical britlle materials.
Analisis Sambungan Antara Balok Iwf dengan Kolom Baja Akibat Beban Siklik Eko Riyanto
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.221236

Abstract

AbstrakPenggunaan tabung baja dengan isian beton dapat meningkatkan kekuatan gaya aksial pada kolom. Selain itu, tabung baja berfungsi juga sebagai bekisting untuk inti beton. Penelitian ini bertujuan untuk mengetahui perilaku histeristis, kekuatan, kekakuan serta pola keruntuhan pada sambungan dalam menahan beban siklik. Dalam penelitian ini, dibuat dua buah benda uji yaitu benda uji sambungan menerus balok-kolom tabung baja dengan isian beton dan benda uji sambungan menerus balok-kolom tabung baja tanpa adanya isian beton. Sambungan sayap pada profil IWF yang menghubungkan kolom dan balok dibuat menembus kolom tabung baja dan dilas pada permukaan kolom. Benda uji dibebani dengan siklus beban yang mengacu pada ACI 374.1-05. Hasil pengujian menunjukkan benda uji dengan sambungan balok-kolom tabung baja isian beton memiliki histeresis lebih besar dari kolom tabung baja tanpa isian  beton. Benda uji memiliki kegagalan  tipe daktilitas parsial jika sebagai kriteria untuk memenuhi strong column weak beam. AbstractThe use of steel tube columns has several advantages including: steel tubes also function as formwork for concrete cores, with the presence of concrete fillers in steel tubes, the compressive strength of steel tubes against axial forces will also increase. In addition the steel tube serves to prevent cracks in the concrete, and the composite column greatly increases stiffness and significant strength compared to the construction of steel frames and ordinary reinforced concrete. The connection between beams and steel tube columns must have sufficient strength to withstand earthquake loads. This study aims to determine the ability of beam joints with columns and to know the strength, as well as the pattern of joint collapse in resisting cyclic loads. In this study, a continuous steel beam column column test specimen was made with concrete fillings and continuous test specimens of steel tube columns without concrete filling. The wing joint on the IWF profile that connects columns and beams is made through steel tube columns and welded to the column surface. The test object is loaded with the load cycle referred to in ACI 374.1-05. The test results showed that the steel tube column-beam joint test object with concrete filling had a hysteresis loops larger than steel tube columns without concrete filling. The test object has a partial ductileity type failure as a criterion of strong colun weak beam.
Redesain Kolom Segiempat Ke Kolom Lingkaran Pada Gedung Kejaksaan Tinggi Riau Usman, Ali; Harsoyo, Yoga A.
Semesta Teknika Vol 22, No 2 (2019): NOVEMBER 2019
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.222247

Abstract

Fasilitas perkantoran banyak dibangun di Indonesia mulai dari kantor untuk pemerintahan hingga swasta. Kantor dibangun sebagian besar menggunakan kolom pada umumnya yakni kolom berpenampang persegi. Penampang kolom dengan bentuk lain yakni kolom lingkaran, kolom ini ketika berada dilapangan pada perkantoran jarang digunakan sehingga peneliti melakukan penelitian yang bisa menjadi saran bahwa kolom lingkaran baik digunakan pada bangunan kantor dari segi biaya, tulangan dan beban gempa. Redesain dilakukan pada gedung Kejaksaan Tinggi Riau dimana yang redesain pada kolom utama K1. Perancangan ulang dibantu dengan Etabs 2016 serta SNI 2847:2013, SNI 1726:2013, SNI 1727:2013 dan peraturan lain. Salah satu langkah menjadi pembeda dari penelitian lain diagram interaksi 1%-6% dibuat secara manual berdasarkan SNI 2847:2013 untuk penentuan persen tulangan utama kolom. Penelitian membuahkan hasil dimana kolom lingkaran dari biaya lebih murah 48,7% dari persegi. Kebutuhan tulangan utama lebih kecil dari persegi dengan persentase 3,13%. Sengkang 85,08 persen lebih kecil lingkaran. Kinerja menahan beban gempa kolom lingkaran hampir menyamai dengan persegi dengan selisih displacement pada arah x dan y sebesar 0,0001 m. Sehingga dari hasil disimpulkan bahwa kedepannya dalam membangun sebuah gedung kantor tidak hanya menggunakan kolom persegi sebagai kolom utama tetapi juga dapat menggunakan kolom lingkaran sebagai kolom utama. Office facilities have been built in Indonesia ranging from offices for government to private. The office was built mostly using columns in general, square columns. Column cross-section with another form that is a circle column, this column when in the field in offices is rarely used so researchers conduct research that could be a suggestion that the circle column is good for office buildings in terms of cost, reinforcement and earthquake load. The redesign was carried out at the Riau High Prosecutors building where the redesign was in the main column K1. The redesign was assisted with Etabs 2016 and SNI 2847: 2013, SNI 1726: 2013, SNI 1727: 2013 and other regulations. One step becomes a differentiator from other studies 1% -6% interaction diagram created manually based on SNI 2847: 2013 for determining the main percent reinforcement column. The research yielded results where the circle column of the cost is 48,7% cheaper than the square. The need for major reinforcement is smaller than a square with a percentage of 3,13%. Brace 85,08 percent smaller circle. The performance of withstanding earthquake column circle loads is almost equal to square with displacement difference in the x and y directions of 0,0001 m. So from the results concluded that in the future in building an office build not only uses a square column as the main column but also can use the circle column as the main column.
Prediksi Beban Listrik Menggunakan Algoritma Jaringan Syaraf Tiruan Tipe Propagasi-Balik Syahputra, Ramadoni; Syahfitra, Febrian Dhimas; Putra, Karisma Trinanda; Soesanti, Indah
Semesta Teknika Vol 23, No 2 (2020): NOVEMBER 2020
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v23i2.9940

Abstract

Artikel ini mengusulkan prediksi beban puncak menggunakan metode jaringan syaraf tiruan tipe propagasi-balik. Prediksi beban puncak transformator tenaga merupakan tugas penting dalam mengantisipasi pertumbuhan beban listrik di masa mendatang. Prediksi yang tepat dan akurat akan memfasilitasi perencanaan kapasitas pembangkit listrik yang memadai pada waktu yang tepat. Metode jaringan syaraf tiruan tipe propagasi-balik memiliki akurasi yang baik dalam tugas-tugas prediksi. Pada penelitian ini dilakukan prediksi beban puncak pada dua buah transformator tenaga dengan studi kasus di Gardu Induk Bumiayu, Brebes, Jawa Tengah, Indonesia. Parameter pelatihan adalah data pertumbuhan penduduk, produk domestik regional bruto (PDRB), dan data beban puncak selama sepuluh tahun terakhir. Hasil penelitian menunjukkan bahwa kedua unit transformator tenaga tersebut masih dapat melayani beban listrik di wilayah pelayanan Gardu Induk Bumiayu selama sepuluh tahun ke depan.   This article proposes a peak load prediction using the backpropagation neural network method. Predicting the peak load of power transformers is an important task in anticipating load growth in the future. Precise and accurate predictions will facilitate the planning of sufficient power generation capacity at the right time. The backpropagation type neural network method has good accuracy in the prediction task. In this study, a case study was carried out by predicting the peak load of power transformers at Bumiayu Substation, Brebes, Central Java, Indonesia. Training parameters consists of population growth data, gross regional domestic product (GRDP), and peak load data for the last ten years. The results showed that the two power transformer units could still serve the electricity load in the Bumiayu substation service area for the next ten years.   
Analisis Kinerja Kontraktor yang Menerapkan Sistem Manajemen Mutu ISO-9000 Priyo, Mandiyo
Semesta Teknika Vol 12, No 1 (2009): MEI 2009
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v12i1.750

Abstract

The growth in the implementation of quality management system standard as an instrument to win global market competition and to improve product and service quality has affected not only manufacturing industries but also construction industries. One of the standards that is most widely implemented by companies or organizations in quality management system may be the ISO 9000. It should be noted that the ISO 9000 is not a standard for products or services, but it is a standard for quality management system employed in their production process. The objective of this research is to study the implementation of the ISO 9000 standard by the PT. Wijaya Karya Beton that has adopted the ISO 9000 for its quality management system standard. In addition, the criteria for evaluating its performance have also been identified. This criterion includes written procedure and its consistent implementation, as well as the measurement of the implementation result of its operation process flow and working procedures. This research was carried out by means of performance measurement, i.e. qualitatively by employing questionnaire, scoring and measurement on productivity and targeted quality achievement such as rework rate and reject rate. The data were collected by observation, extraction from the internal and external quality audit report, as well as daily-, weekly- and monthly reports on the pile production. The effect of company’s performance that employs the ISO 9000 standard (qualitative measurement) on the productivity, rework rate and reject rate (quantitative measurement) were analysed using Pearson’s Product Moment correlation analysis technique. The result reveals that the qualitative measurement resulted in continuous performance improvement, so did the quantitative measurement. It showed that these two measurement methods tends to be in a good agreement. A general conclusion that can be drawn is that the ISO 9000 has been properly implemented in the PT. Wijaya Karya Beton.
Evaluasi Tebal Perkerasan Lentur Dengan Metode Analisa Komponen Dari Bina Marga 1987 Dan Metode Aashto 1993 Menggunakan Program Kenpave (Studi Kasus: Jalan Karangmojo-Semin Sta 0+000 sampai Sta 4+050) Doni Ikrar Dinata; Anita Rahmawati; Dian Setiawan M
Semesta Teknika Vol 20, No 1 (2017): MEI 2017
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v20i1.2723

Abstract

In Indonesia, many roads have been damaged especially on flexible pavement design. There are caused by the high of traffic volume, extreme climate changes, the bad subgrade quality and the lack of quality of pavement material. The aim of this research is to analysis of the pavement quality of the road using KENPAVE program. Case study research is on Karangmojo– Semin road,  Sta. (0 + 000) to Sta. (4 + 050), Gunung Kidul,  D.I Yogyakarta. The program can give the value of stress and strain on the road due to traffic load. The response of  stress and strain caused by fatigue cracking and rutting from KENPAVE output with pavement thickness analysis using Bina Marga 1987method are 0,000408 and 0,00138, respectively and using AASHTO 1993 method the fatigue crackingand rutting are 0,000322 and 0,00134, respectively. The flexible pavement design using method of Bina Marga 1987 and AASHTO 1993 produce the amount of load repetition with a traffic load plan is greater than the number of repetition load plan, so the road will have possibilities of  fatigue cracking and rutting damage before the design life reached.

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