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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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Pengaruh Sandwich Laminated Coco Mat Dan Chopped Strand Mat Terhadap Kekuatan Material Komposit Tarkono Tarkono
Semesta Teknika Vol 10, No 2 (2007): NOVEMBER 2007
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v10i2.843

Abstract

The application of coco fibre is widely open. In rural area, as a main source of coco fibre, the fibre only used for cooking and family products. As the technology development, how coco fibre can applied as a part of composites materials. If it compound with other specific components, we can produce a new material with better mechanical properties. In this research, coco fibre with 0,2% wetness, compound with latex then pressed to get a coco mat with 2 mm thickness. Coco mat then formed with chopped strand mat to get a sandwich laminate composite. The original tensile strength of coco mat is 2,47 kgf/mm2 will increased to 12,93 kgf/mm2 if it formed as sandwich laminate coco fibre, its tensile strength improve about 80,90%.
Sifat-sifat Tarik dan Flexural Komposit Serat Sabut Kelapa Unidireksional/Poliester Sudarisman Sudarisman; Berli P Kamiel; Slamet Rahadi
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.v17i2.425

Abstract

The purpose of this study is to investigate the tensile and flexural properties of unidirectional coconut fiber/polyester composite materials, and to describe their failure modes. Specimens were cut from fiber/polyester composite plates containing various fiber contents. Materials being used in this study are coconut fiber that was previously alkali-treated and polyester resin matrix. Whilst tensile testing was carried out in accordance with the ASTM D3039 standard, flexural testing was based on the ASTM D790 standard. Failure surfaces of the representative specimens were then observed under an optical microscope, and their digital photo macrographs were captured for image analysis in order to describe their respective fiber distribution pattern and to determine their respective actual fiber volume fraction, Vf, by means of an open source software called ImageJ. It was found out that the actual Vf of the four composite plates being produced were 10.7%, 17.6%, 27.4% and 40.5%. It was revealed that while tensile strength increases with the increase of Vf, while failure strain, modulus elasticity and flexural strength decreases. The average highest tensile strength, tensile failure strain, and tensile modulus of elasticity were found being 30.01 MPa at Vf = 40.5%, 0.027 mm/mm at  = 0%, and 1.47 GPa at Vf = 0%, respectively. The average highest flexural strength, failure strain and modulus of elasticity were observed being 153.92 MPa at Vf = 10.7%, 0.0358 mm/mm at Vf = 0%, and 3.242 GPa at Vf =10.7%, respectively. It was observed that specimens were failed by fiber pull out and debonding.
Optimasi Konfigurasi Mainjet Dan Slowjet Karburator Motor Bensin Satu Silinder 97 Cc Prawoto Prawoto
Semesta Teknika Vol 9, No 1 (2006): MEI 2006
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v9i1.882

Abstract

This paper describes a study that compared performance and emission from a 97 cc small single cylinder gasoline engine using five differences carburetor jet configuration. The study is based on the engine test bed results. The test results have shown that the bigger main jet produce slightly higher torque and power than the smaller one, but the fuel consumption also higher. The emission test results have shown a higher hydrocarbon (HC) and carbon monoxide (CO) for bigger main jet configuration. However Oxide of Nitrogen (NOx) emission from bigger main jet configuration was generally lower. The smallest jet configuration produced to lean fuel air mixture and caused engine over heat. The data obtained in this study indicate that the best configuration for the engine tested is 72/38 jet configuration.
Pengaruh Fraksi Volume Serat dan Lama Perendaman Alkali terhadap Kekuatan Impak Komposit Serat Aren-Polyester M. Budi Nur Rahman , Bambang Riyanta , Kuncoro Diharjo
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.v14i1.567

Abstract

Palm fiber waste in the industrial processing of starch sugar palm has potential as reinforcing material composite material. This research to determine the effect of fiber volume fraction and long immersion in alkaline solution (NaOH) 5% for the impact strength composites waste palm fiber-polyester. The material used is a waste of palm fiber, unsaturated polyester 157 BQTN, MEKPO catalyst and 5% alkaline solution. Preparation of composites made by the method of press mould. The Composites made with variations of the volume fraction of 10%, 20%, 30%, 40%, 50% and long immersion alkali solution is 0, 2, 4, 6, and 8 hours. The impact test conducted by Izod impact testing machine refers to the standard ASTM D 5941. The results showed that increasing the volume fraction will increase the impact strength, but the subsequent decline. The longer the alkali treatment will reduce the impact strength because the fiber has undergone treatment. The impact strength maximum of the composites with fiber volume fraction of 40% and without alkaline immersion of 0.3211 J/mm2. Characteristics of a broken section of palm fiber composite material are a polyester matrix of a single fracture.
Pengembangan Perangkat Lunak Elemen Hingga untuk Keperluan Pendidikan Agung Premono; Ahmad Kholil; Hidayat Hidayat; Dendy Saputra
Semesta Teknika Vol 25, No 1 (2022): MEI 2022
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v25i1.13632

Abstract

Metode elemen hingga adalah salah satu mata kuliah wajib pada hampir seluruh jurusan Teknik mesin di Indonesia. Pembelajaran mata kuliah ini biasanya dibantu menggunakan perangkat lunak komersial. Tetapi, penggunakan perangkat lunak komersial menyebabkan mahasiswa hanya memahami bagaimana menggunakan perangkat lunak tanpa memahami persamaan matematika dan bagaimana proses penyelesaiannya. Tujuan penelitian ini adalah mengembangkan perangkat lunak yang memungkinkan mahasiswa tetap memahami prosedur penyelesaian secara matematika dalam menyelesaikan sebuah masalah. Pengembangan perangkat lunak dilakukan dengan bahasa pemrograman MATLAB. Elemen truss dan aksisimetri digunakan sebagai contoh untuk implementasi pengembangan perangkat lunak. Hasil perhitungan perangkat lunak divalidasi dengan hasil perhitungan yang dilakukan dengan perangkat lunak LISA. Hasil validasi menunjukkan bahwa hasil perhitungan perangkat lunak yang dikembangkan memiliki tingkat kesalahan dibawah 1 % dibandingkan dengan hasil perhitungan perangkat lunak LISA. Dengan demikian maka perangkat lunak hasil pengembangan telah bekerja dengan benar. 
Gelang Giroskop dengan Parameter Sumbu X dan Y sebagai Alat Pemandu Salat bagi Tunarungu Arti Nurhafizah; Hanifah Rahmi Fajrin; Wisnu Kartika
Semesta Teknika Vol 25, No 1 (2022): MEI 2022
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v25i1.13365

Abstract

Mayoritas penduduk Indonesia beragama Islam, diantaranya lebih dari 13 ribu orang penyandang disabilitas Tunarungu. Dalam melaksanakan Salat berjamaah, Tunarungu kesulitan mengikuti instruksi gerakan Imam. Tujuan pembuatan inovasi alat gelang giroskop adalah untuk membantu penyandang disabilitas Tunarungu mengikuti instruksi gerakan Imam saat melaksanakan Salat berjamaah. Metode yang digunakan pada gelang giroskop adalah dengan  memberikan notifikasi berupa getaran yang berbeda pada setiap perubahan gerakan Imam. Sensor pendeteksi perubahan sudut X dan Y yaitu sensor gyroscope MPU6050. Pengaturan range sudut yaitu pada sumbu X dan sumbu Y untuk mendeteksi setiap perubahan gerakan Salat. Sistem kontrol alat menggunakan arduino nano FT232RL FTDI FT232. Modul komunikasi menggunakan HC-12 SI4463.Gelang yang digunakan Imam akan mengirimkan kode berupa perubahan sudut sumbu X dan sumbu Y ke gelang yang digunakan oleh makmum Tunarungu. Tingkat keberhasilan pada gelang giroskop mencapai 89%. Dengan demikian,gelang giroskop pemandu Salat bagi Tunarungu dapat membantu makmum Tunarungu dalam melaksanakan ibadah Salat berjamaah.
Analisis Perbandingan Karakteristik antara AC-WC Asbuton dengan Cold Paving Hot Mix Asbuton (CPHMA) Valdo Pinangkaan; Tampanatu P. F. Sompie; Sudarno Sudarno
Semesta Teknika Vol 25, No 1 (2022): MEI 2022
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v25i1.13716

Abstract

Jalan beraspal meningkatkan mobilitas orang dan barang supaya lebih mudah, aman dan nyaman. Jenis aspal terdiri dari aspal alam dan aspal minyak, seiring perkembangan teknologi campuran aspal Asbuton dipadatkan pada temperatur ruang. Penelitian ini bertujuan untuk mendapatkan perbandingan nilai karakteristik Asbuton yang dimodifikasi atau Asbuton pra-campur untuk bahan pengikat dicampuran Asphalt Concrete-Wearing Course (AC-WC) dengan Cold Paving Hot-Mix Asbuton (CPHMA). Metode yang digunakan adalah eksperimental dengan melakukan pengujian laboratorium. Hasil pengujian menunjukkan persentase komposisi AC-WC Asbuton: batu pecah 13-19 = 9.0%, batu pecah 5-13 = 43.0%, abu batu = 47.0% dan filler = 1.0%.  Nilai Kadar Aspal Optimum untuk AC-WC Asbuton dengan variasi Kadar Aspal 5%, 5.5%, 6%, 6.5%, 7% adalah 6.35%. Berdasarkan perbandingan nilai yang diperoleh, AC-WC Asbuton memiliki kepadatan serta ketahanan dalam menerima beban kendaraan yang lebih baik dari CPHMA. CPHMA memiliki rongga dalam campuran dan rongga dalam agregat yang lebih banyak dibandingkan AC-WC Asbuton.
Desain Struktur Jembatan Kereta Api Tipe Concrete Through Arch: Studi Kasus Jembatan Kereta Api BH 1828 Purworejo Algazt Aryad Masagala
Semesta Teknika Vol 25, No 1 (2022): MEI 2022
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v25i1.13734

Abstract

Jembatan rel kereta api BH 1828 berlokasi di Butuh, Kutoarjo, Purworejo. Desain struktur jembatan tipe through arch memiliki lebar 4,9m, panjang bentang total 46 m, dan tinggi 7,5 m. Penelitian ini bertujuan untuk memperoleh dimensi dan kebutuhan penulangan, serta besar nilai lendutan dengan mengacu pada PM No. 60 Tahun 2012 tentang Persyaratan Teknis Rel Kereta Api, SNI 2833:2016 tentang Perencanaan Jembatan Terhadap Beban Gempa, dan RSNI T-12-2004 sebagai Perencanaan Struktur Beton untuk Jembatan. Desain dilakukan secara bertahap yang dimulai dari penentuan jenis struktur yang dipergunakan, dimensi struktur, pemodelan komputer, pembebanan, perancangan tulangan dan kontrol lendutan. Berdasarkan perhitungan diperoleh dimensi; girder eksterior, interior, diafragma, dan arch memiliki dimensi 450 x 650 mm; dimensi hanger dan bracing 450 x 450 mm. Untuk nilai lendutan maksimal tengah bentang sebesar 0,054 m lebih kecil dari lendutan izin L/800 = 0,058 m.
Penerapan Konstruksi Ramping terhadap Waste pada Ruang Lingkup Manajemen Proyek (Studi Kasus: Proyek Pembangunan Gedung Auditorium di Yogyakarta) Adwitya Bhaskara; Albert Atmaja Ginting; Alfatsya Mubian Masagala
Semesta Teknika Vol 25, No 1 (2022): MEI 2022
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v25i1.13403

Abstract

Konstruksi ramping telah diterapkan banyak proyek, artinya dalam masa perencanaan proyek telah meminimalisir waste dengan efektif dan efisien. Tujuan penelitian ini untuk mengidentifikasi variabel penyebab waste yang paling dominan pada proyek dan mengetahui penerapan Konstruksi Ramping pada proyek. Dalam mencapai tujuan tersebut maka digunakan metode Teorema Bayes untuk menentukan probabilitas dari waste 5M ruang lingkup manajemen. Hasil dari analisis probabilitas waste bahwa variabel-variabel yang menyebabkan waste adalah tenaga kerja sulit untuk bekerja sama dalam satu tim kerja (18,18%), material datang ke lokasi terlalu cepat (20,00%), alat berat terlambat sampai di lapangan (15,69%), denda karena keterlambatan proyek (34,88%) dan kesalahan dalam pemilihan jenis objek struktur (19.35%). Kemudian hasil dari analisis pengisian kuesioner penerapan konstruksi ramping dan observasi di lapangan bahwa proyek ini telah menerapkan konstruksi ramping sebesar 94,44%.
Utilization of Grits and Dreg Wastes for Ceramics Raw Material Edwin Kristanto Sijabat; Andrie Harmaji; Rafida Khoirani
Semesta Teknika Vol 25, No 2 (2022): NOVEMBER 2022
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v25i2.14832

Abstract

This research utilizes dreg and grits wastes from pulp industry by addition of kaolin as raw material in producing ceramics that have good physical and mechanical properties. Dreg and grits were prepared by drying in an oven at 120°C for 5 hours, then crushed and sieved using a 200 mesh sieve, then characterized by means of Inductively Coupled Plasma (ICP). Ceramic samples were printed using Compressive Gauge Testing with a strength of 15 kN for 60 seconds. The kaolin percentage was varied between 20-80% followed by drying for 48 hours at room temperature. The ceramic samples were burned in a stepwise furnace temperature of up to 1000°C with a holding time of 30 minutes. Their physical properties, i.e. density, porosity, fuel loss, and water absorption, were characterized, and their compressive strength was investigated. The ICP test showed that the highest chemical content in the dreg and grit is CaO, at 36% and 50%. The optimum dose of ceramics produced in this study is the composition of 80% kaolin. The percentage of kaolin mixture is directly proportional to the compressive strength, density and fuel shrinkage, while the porosity and water absorption are inversely proportional. The ceramic characterization was obtained with compressive strength ranging from 4.48 MPa to 11.98 MPa.

Page 66 of 72 | Total Record : 715

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