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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
 44   45   46   47   48 
Sifat Mekanis dan Struktur Mikro Pengelasan Gesek Baja Tahan Karat Austenitik AISI 304 Aris Widyo Nugroho, Totok Suwanda, Febri Irwanto
Semesta Teknika Vol 17, No 1 (2014): MEI 2014
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v17i1.413

Abstract

The aim of this study is to investigate experimentally the microstructural properties and welding strengths of the friction welded joints using austenitic stainless steel (AISI 304) base metal. The experiments were carried out using a beforehand designed and constructed experimental friction welding set-up. Firstly, the welding experiments were under different friction pressure (1,38-4,14 MPa) and upsetting pressure (6,90-8,27 MPa). Later, the strengths of the joints were examined by tension test and the results were compared with those of the base metals. Microstructures in the interfaces of the joints were also obtained and examined. The results show that porosities were observed in bondline zone for all specimens. As the friction pressure increased, the fully plastically deformed zone becomes increased.  Tensile test results indicated that, generally the joint strength is increased with an increase of the friction pressure and the upsetting pressure. The friction welded joint strenght were found to be lower than that of the base metal. The detailed fractographic observation confirmed that the brittle rupture occurred at the joint zone. 
Perbandingan Kualitas Komponen Sepeda Motor Melalui Uji Standar Mekanik Djatmiko, Eddy; Karmiadji, Djoko W
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.v10i2.845

Abstract

Sepeda motor adalah ragam transportasi favorit di Indonesia. Pembuat motor asing mengambil kesempatan ini dan telah beberapa tahun mendominasi industri sepeda motor Indonesia. Setelah krisis moneter yang besar, pembuat sepeda motor asing yang lain membanjiri pasar, promosi harga lebih rendah dan kesamaan kualitas terhadap pesaing mereka. Satu tujuan uji scientific diperlukan untuk membandingkan dua jenis sepeda motor agar supaya informasi kekonsumen yang benar mengenai kualitas suku cadangnya. Pengujian komponen sepeda motor ini (cylinder block, cylinder head, dan engine housing) yang dilakukan di laboratorium kekuatan material, komponen dan struktur PUSPIPTEK Indonesia (B2TKS  BPPT), akan menggunakan berbagai struktur teknik uji mekanik untuk kuantitas berbagai kualitas dari bahan komponen seperti nilai kekerasan, kuat tarik dan lenturan. Standar ASTM dan JIS pembuatan dan pengujian spesimen digunakan untuk membandingkan berbagai sifat mekanik komponen dari dua jenis sepeda motor. Spesimen langsung dibuat dari komponen melalui proses permesinan dan dibuat sesuai standar. Dari seri pengujian dapat disimpulkan bahwa kekerasan blok silinder sepeda motor asing  baru melebihi sepeda motor asing yang sudah ada.Kesimpulan hasil pengujian tarik yaitu “engine housing”. dan “cylinder head” serta cylinder block dari sepeda motor asing yang ada menghasilkan kuat tarik yang lebih tinggi jika dibandingkan dengan sepeda  motor produksi baru.
Sistem Pengendali Suhu, Kelembaban Dan Cahaya Dalam Rumah Kaca Tony K Hariadi
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.v10i1.856

Abstract

Rumah kaca merupakan sebuah bangunan tempat budidaya tanaman dengan pengaturan beberapa variabel di dalamnya agar sesuai dengan kebutuhan tumbuh kembang tanaman yang sedang dibudidayakan saat itu. Perkembangan teknologi elektronika memungkinkan untuk melakukan pengendalian variabel-variabel tersebut secara otomatis dan terus menerus. Penelitian dan perancangan ini bertujuan untuk membuat sebuah sistem pengendali temperatur, kelembaban, cahaya, dan penyiraman dalam rumah kaca secara terpadu. Implementasi pengendalian rumah kaca dilakukan dengan menggunakan mikrontroler sehingga memudahkan pemrograman terhadap kondisi-kondisi tanaman yang berbeda-beda dengan berbagai perlakuan yang berbeda pula. Suhu diatur menggunakan air conditioner yang sudah dimodifikasi untuk diprogram dari mikrokontroller,s sedangkan pengaturan cahaya menggunakan lampu dan pengaturan lain adalah kelembaban berdasarkan perhitungan suhu basah dan kering serta penyiraman. Setelah pembuatan alat selesai, maka alat tersebut diujicobakan didalam rumah kaca dan diamati kondisi di dalam rumah kaca selama 3 kali 24 jam.  Hasil ujicoba menunjukkan bahwa alat tersebut mampu mengendalikan parameter-parameter yang diinginkan sesuai dengan program pada mikrokontroler, dan mampu mengurangi efek kondisi cuaca di luar rumah kaca.
Uji Model Fisik Water Treatment Bentuk Pipa dengan Media Aerasi Baling-Baling Surya Budi Lesmana , Indah Nurfathin
Semesta Teknika Vol 15, No 1 (2012): MEI 2012
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v15i1.444

Abstract

Both water and health are inter-connected things. Water is used for many daily needs. In Universitas Muhammadiyah Yogyakarta, water needs are quite big, such as for bathroom needs, laboratory, mosque and other places. Because of that, water quality in campus need to be examined in order to fulfill requirement of Indonesia Health Ministry (KepMenKes No. 907/2002). That requirement is about water conditions and supervision. This study aimed to analyze the ability of water treatment equipment used by doing analysis of Fe and DO parameters.
Studi Efektifitas Indikator Kestabilan Tegangan Pada Model Dinamis Sistem Tenaga Listrik Muhammad Nizam
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.v9i1.880

Abstract

The paper presents the effectiveness of voltage stability indices for dynamic power system modelling study in providing information about the proximity of voltage collapse in power system. Four simple stability indices as Voltage Instability Predictor (VIP), Impedance Stability Index (ISI), Line Index (L index) and Voltage Collapse Prediction Index (VCPI) are compared using WSCC 9 bus test system. The comparison show the ISI and VCPI are much more reliable indicator, give the fast indication and fast time computation than L index for voltage collapse in dynamics voltage collapse prediction.
Analisis Kelongsoran Lereng Akibat Pengaruh Tekanan Air Pori di Saluran Induk Kalibawang Kulonprogo Hesti Subiyanti; Ahmad Rifa’i; Rachmad Jayadi
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.v14i1.566

Abstract

During rainy seasons, landslide occurs every year in Talang Bawong, Kalibawang Irrigation Channel thatcan damage houses, school building, bridge and the channel. Considering this fact, a numerical analysis by modeling the slope at the site was conducted. The objectives of this research were to identify the rain characteristic in the research site and to recognize its influence towards the change of water pressure in soil as well as the slope failure. The input data of this analysis were slope topography, physical and mechanical properties of soil applied. Groundwater flow in the slope model was numerically simulated by using SEEP/W software. Designed rainfall with appropriate return period was determined by analizing the maximum daily rainfall data with the aid of HAVARA software, while rainfall depth distribution was completed by applying frequency analysis. The historical daily rainfall data (1985 – 2004) were obtained from Kalibawang rain stasiun. Six rainfall models, as follow: initial condition (no rain) (model I), heavy rain in a short duration (model II), normal rain 25 mm and 40 mm in a long duration (model III), normal rain 20 mm in a long duration (model IV), heavy rain followed by normal rain 20 mm (model V), and normal rain 20 mm followed by heavy rain (model VI) Were analyzed. The output of the simulation was water pressure distribution data, which in turn being used as input data in analyzing slope stability using the SLOPE/W software. The result of the research showed that the highest rainfall with 2-year-return period was 114 mm while the dominant duration was 4 hours/day, and it was applied in the model II. The result showed that, a normal rain in a long duration is more severely influenced the change in water pressure than a heavy rain in a short duration. The safety factors are 1,444 for no rain condition, 1,418 for 114 mm rain for 4 hours, 1,208 for 25 mm and 40 mm rains, 0,982 for 20 mm rain, 1,397 for heavy rain followed by normal rain, and 1,402 for normal rain followed by heavy rain. In addition, a 20 mm normal rain on the 61st  day resulted in the most severe influence on the slope failure. 
Penyesuaian Impedansi Antena Open Dipole RF 217 MHz Menggunakan Metode Single Stub Bledug Kusuma Prasaja; M Abdulah K Sirat
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.v8i1.912

Abstract

Penyesuaian impedansi merupakan suatu masalah yang sangat penting untuk diperhatikan pada saat menginstalasi antena suatu pemancar. Gelombang yang dipantulkan kembali ke pemancar akan mengakibatkan panas dan kerusakan pada penguat akhir pemancar, sehingga menyebabkan penurunan daya atau daya yang dihasilkan oleh pesawat pemancar tidak akan maksimal. Penelitian dilakukan untuk mengetahui seberapa besar impedansi antena berkontribusi pada matching impedance (penyesuaian impedansi), menggunakan metode single stub tuner. Hasilnya adalah Pada pengukuran yang menggunakan kabel koaksial RG-55 A/U, posisi paling match terjadi pada jarak 30 cm dari antena ke arah generator sehingga stub dipasang secara permanen pada jarak tersebut, sedangkan  pada pengukuran yang menggunakan kabel koaksial 5D-2W, posisi paling match terjadi di antena itu sendiri dan tidak ditemukan posisi match pada saluran sehingga stub tidak dipasang. Pada kabel koaksial RG-11/U, posisi paling match terjadi pada jarak 20 cm dari antena ke arah generator sehingga stub dipasang secara permanen pada jarak tersebut. 
Implementasi Arsitektur Operational Data Store (ODS) dan Dimensional Data Store (DDS) dalam Pembangunan Data Mart Lulusan Rohmana Zulfa Bakhtiar; Slamet Riyadi; Asroni Asroni
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.v18i1.706

Abstract

Universitas Muhammadiyah Yogyakarta (UMY) is a big and high-grade educational institution. During the period of 1998-2014, UMY has produced about 20550 graduates. But, the big number of graduates is not supported by a good data storage system. Whereas those data are needed in filling up the accreditation form. For that reason, we have to build an integrated data storage system to provide graduates data as needed, that is graduate data mart. The development of graduate data mart uses SDLC Model Waterfall method. This method involves several types, there are requirement analysis, design system, implementation system, testing system, and maintenance system and those must be done sequentially. If there is an error, the process must be repeated from the beginning to fix the error. Development of graduate data mart uses Operational Data Store (ODS) and Dimensional Data Store (DDS) architecture. Those architectures are selected because they support transactional level. By using those architectures, graduate data mart is capable to display the data of graduates on the academic year, GPA, educational years, and the status of the student transfers. As the result, those data are able to help the management of university in filling up the accreditation form.
Gaya Lateral In-Plane Struktur Portal Dinding Pasangan Bata ½ Batu Melalui Analisis Numerik Hakas Prayuda
Semesta Teknika Vol 18, No 2 (2015): NOVEMBER 2015
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v18i2.1814

Abstract

Building construction in Indonesia is categorized as two big classes; there are engineered building and non-engineered building. Non-engineered building is very susceptible to the lateral load such as an earthquake, either medium earthquake or massive earthquake that causing sudden collapse so that the research of mitigation building strength needs to be done which is rely on the strength of brick masonry (non-engineered building) that can be predicted through measuring micro vibration at the bottom and the top of the brick masonry wall surface. The aims of this research is to find out the effect of ½ stone brick masonry in its contribution to the rigidity of simple portal structure by using loading in-plane lateral system. Loading analysis result at the plastic limit is 95, 524 kN or only 86,89% of the maximum load, meanwhile lateral deviation at the plastic limit is 7,506 cm or 27,51% of maximum lateral deviation. Besides, The rigidity of ½ stone brick masonry wall is 12,72 kN/cm.
Pengujian Kinerja Pompa Sentrifugal Menggunakan Kontrol Inventer Wahyu Djalmono Putro
Semesta Teknika Vol 13, No 1 (2010): MEI 2010
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v13i1.722

Abstract

An alternative method for obtaining data on pump discharge and head in order enable to determine pump characteristics has been investigated and formulated. Three types of centrifugal pump, the snails house, diffuser and turbine, have been selected. According to their respective manufacturers, the heads of these pumps are 16 m, 11 m and 9 m, respectively; their respective debits are 105 m3/h, 105 m 3/h and 150 m3/h; and their respective efficiencies are 95 %, 70 % and 95 %. Two testing parameters, shaft rotation and ball valve opening portion have been considered. Five different rotations, 1500 rpm, 1750 rpm, 2000 rpm, 2500 rpm and 2800 rpm, and seven different ball valve opening portions, 0 %, 25 %, 30 % 45 %. 60 %, 75 % and 100 %, have been considered. The main units of the alternative methods for measuring pump discharge and head are an electric motor, an inventer, a U-tube manometer and an orifice. The result shows that the heads the pumps are 15,4 m,11,45 m and 9,7 m, respectively, the debits of the pumps are 103 m3/h, 108 m 3/h and 171 m3/h, and efficiency are 98 %, 69,5 % and 97,5 %, respectively. Controlled inventer method can be used as one of the alternative pump performance test.

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