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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 Pengaruh Karakteristik Hujan terhadap Gerakan Lereng Haryanti, Sri; Suryolelono, Kabul Basah; Jayadi, Rachmad
Jurnal Semesta Teknika Vol 13, No 2 (2010): NOVEMBER 2010
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Abstract

Soil movement mostly occurs especially during rainy season at the slope of Kalibawang irrigation channel at KM 15,9 in Kulon Progo district, Daerah Istimewa Yogyakarta. The slope movement causes damage at the school building, bridge and irrigation channel. Based on this fact, a research is necessary by modeling the slope at site of conducted. The objectives of this research are to identify the rainfall characteristic which triggering slope movement and to recognizes factor affecting the slope movement. Topography data, physical characteristic, and soil mechanic were applied as the input simulation models. Groundwater flow in slope was numerically simulated by using SEEP/W while the slope deformation simulated by SIGMA/W. Both SEEP/W and SIGMA/W were applied simultaneously in the numerical simulation. Rainfall design with appropriate return period was determined from rainfall annual daily maximum historical data recorded from 1985-2004, while distribution was completed by applying statical analysis on hourly rainfall data. The analysis of normal daily rainfall was determined based on daily rainfall data from Kalibawang rain gauge. Six models were applied as follow: initial condition (Rainfall Model I), heavy rainfall in short duration (Rainfall Model II), normal daily rainfall of 25 and 40 mm in long duration (Rainfall Model III), normal daily rainfall of 20 mm in long duration (Rainfall Model IV), heavy rainfall followed with normal daily rainfall of 20 mm (Rainfall Model V) and normal rainfall of 20 mm followed with heavy rainfall (Rainfall model VI). The result shows that at the research location, the maximum daily rainfall of 2-year-return period is 113,8 mm with dominant duration was 4 hour per day. This value was applied as Rainfall Model II. Based on the simulation the movement or deformation with Rainfall Model II, III, IV, V and VI is 0,22 m; 0,956 m; 1,01 m, ; 0,652 m, and 0,568 respectivally. It is concluded that at the research location, heavy rainfall in short duration gives small impact to slope movement or slope deformation and normal rain of 20 mm in long duration (Rainfall Model IV) is highly significant to the slope movement or slope deformation.
Experimental Investigation of Seismic Parameters and Bearing Capacity of Pavement Subgrade Using Surface Wave Method Widodo, Wahyu
Jurnal Semesta Teknika Vol 12, No 1 (2009): MEI 2009
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The spectral analysis of surface waves (SASW) method is introduced as an in-situ non-destructive seismic technique where the method consists of the generation, measurement and processing the dispersive Rayleigh waves from two vertical transducers. Subsequently, the dispersive data of Rayleigh phase velocity are inverted and the shear wave velocity versus depth of the site is obtained. The dynamic stiffness parameters, i.e. elastic modulus generated from the SASW measurements are at a very small strain levels of < 0.001%. At this strain level the soil is linearly elastic and the use of elastic theories is thus justified. The aim of this paper is to investigate the seismic parameters of the pavement subgrade stiffness using the SASW method and to predict its bearing capacity based on the seismic parameters. In order to determine the bearing capacity, in situ dynamic cone penetrometer (DCP) was also carried out in the same location of SASW test.  The relationship of the shear wave velocity and dynamic elastic modulus (Edynamic) of the SASW were found to be in good correlation with bearing capacity obtained by the DCP. 
Analisis Waktu Pelaksanaan Proyek Konstruksi dengan Variasi Penambahan Jam Kerja Priyo, Mandiyo; Sartika, Sartika
Semesta Teknika Vol 17, No 2 (2014): NOVEMBER 2014
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Time and cost greatly affect the success and failure of a project. Measure of the success of a project is usually seen short turnaround time at minimal cost without leaving the quality of result. Systematic project management is required to ensure the project implementation time in accordance with the contract or even faster that the cost could provide benefits. And also avoid any penalties due to delays in project completion. Purpose of this study is to calculate the change of cost and time of implementation project with variations additional hours of 1 hour to 4 hours of overtime by using microsoft project programs. And to compare the results between the cost of fines with changes in costs before and after the addition of working hours (overtime). The results of this study have shown that (1) The minimum project cost was obtained at the time of normal conditions without the addition of overtime hours Rp 25,923,636,641.50 while for the minimum time the project was obtained on the addition of 4 hours is 197.84 days of normal duration of 217 days with the addition of cost of Rp 215,838,008.94 from the normal total cost of Rp. 25,923,636,641.50 to Rp 26,139,474,650.44 (2) Additional hours worked best option is additional three hours of work, in this condition the costs Rp 139,469,427.19 with profits generated Rp 327 156 .032,35.
Penterjemah Report Signalling Message CCS #7 Kurniati, Aprilia; Prasaja, Bledug Kusuma
Jurnal Semesta Teknika Vol 10, No 2 (2007): NOVEMBER 2007
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Pensinyalan merupakan pertukaran informasi yang diperlukan bagi pembentukan, pemantauan dan pemutusan hubungan melalui jaringan dalam suatu aturan dan standar tertentu. Pada sentral telepon 5ESS produksi Lucent Technology (AT&T), terdapat suatu program utility untuk menelusur (tracing) pensinyalan CCS#7 (Commond Channel Signalling # 7). Namun program tersebut tidak dapat langsung menterjemahkan data hasil telusuran tersebut khususnya data report signaling message, sehingga diperlukan sebuah program utility untuk melakukan proses penterjemahan tersebut dengan berpatokan pada standart penterjemahan yang ada. Pada sentral telepon yang tidak memiliki alat untuk menterjemahkan data report signalling CCS#7, program utility mutlak diperlukan.Pada perancangan menggunakan metode perancangan software untuk menterjemahkan report signalling message. Pesan yang diterima dalam bentuk format heksadesimal akan diterjemahkan ke dalam bit-bit dan mencupliknya menjadi informasi yang tepat dengan menggunakan software ini. Sebelum fungsi-fungsi software dibuat hal pertama yang dilakukan adalah melakukan membuat rancangan saoftware yang akan di buat. Data yang diperoleh berupa data print out dari report signalling message yang diperoleh dari PT. Indosat,tbk Jakarta. Data ini diperoleh dari pengamatan pada program procom yang digunakan di sentral Indosat. Adapun proses perancangan antar dibuat dua form yaitu form login yang digunakan sebagai form pengaman software penterjemah. Form kedua yang akan dibuat yaitu form penterjemah report signalling message yang akan digunakan untuk menterjemahkan report signalling message.Hasilnya adalah proses penterjemahan report signalling message dengan menggunakan software bisa lebih cepat dibandingkan dengan penterjemahan secara manual. Lamanya proses penterjemahan manual disebabkan karena petugas harus berulang kali membuka rekomendasi CCITT untuk menterjemahkan pesan tersebut dan mengartikan tiap oktet nya. Penterjemahan secara manual diperlukan w aktu + 15 menit untuk setiap 1 raw data saja, sedangkan penterjemahan dengan menggunakan software hanya dibutuhkan waktu + 1 menit untuk setiap raw data
Pemantauan Lapangan Sistem Penerangan Tenaga Surya 6 x 50 Wp di Sleman Nadjib, Muhammad
Jurnal Semesta Teknika Vol 14, No 2 (2011): NOVEMBER 2011
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Solar module and battery are important components in photovoltaic systems. These components have higher investment cost compared to controller device, lamp, cable, and the frame. Currently, there are six of 50 Wp of solar lighting systems (SLS) installed for cowshed lighting purpose in Sleman. The aim of this research is to investigate the pattern of electricity usage in SLS and to assess its performance, especially in the solar modules and their batteries after two months period of operation. The output voltage and current of solar module, the voltage of charging battery, the load consumption time, and the battery voltage at the end of charging and discharging were measured. The data were analyzed to determine the output power of solar module, average daily load, system performance ratio, and battery performance. It was revealed that the average daily load and performance ratio are 7.26 Ah/day and 49% respectively. Whilst at the end of charging of the battery is 100%, the maximum depth of discharge is 18.03% and its average efficiency is 59.85%. Overall, the SLSs have been well-operated; the solar module has produced electricity and all of the batteries were fully charged from the daily sunlight. However, it appears that the level of electric energy usage is still low. To increase the SLS’s efficiency it is recommended to optimize the usage of the produced electricity by intensifying livestock handling during night time. This solution also needs periodical monitoring of the SLSs which in turn will increase their lifetime.
Penghalusan Derau Pada Penerimaan Sinyal Video Televisi Berwarna Menggunakan Metode Wavelet P, Bledug Kusuma; Qodir, Fathul; Qhomariyah, Nurul
Jurnal Semesta Teknika Vol 8, No 2 (2005): NOVEMBER 2005
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Persoalan pemrosesan sinyal-sinyal yang dialihragamkan, dengan tujuan dapat dikonstruksikan kembali dengan kerugian minimal, adalah bagaimana mendapatkan kembali sinyal asli telah terkontaminasi derau (nois). Penelitian dilakukan untuk melihat sejauhmana transformasi wavelet dapat merekonstruksi sinyal asli yang telah terkontaminasi derau. Transformasi wavelet merupakan suatu metode analisis sinyal beresolusi ragam. Melakukan transformasi wavelet maju berarti mendekomposisikan sinyal kedalam suatu fungsi basis wavelet yang mempunyai karakteristik penskalaan dan translasi. Karena sifat-sifat tersebut maka transformasi wavelet dapat digunakan untuk mengamati perubahan frekuensi sinyal terhadap waktu dan masing-masing komponen frekuensi dapat diamati berdasar skala yang sesuai. Hasil penelitian menunjukkan bahwa analisis foto digital menggunakan metode wavelet, dalam hal ini transformasi wavelet diskrit (DWT), dapat memisahkan (separate) sejumlah noise pada gambar digital. Sehingga gambar digital yang dihasilkan akan mendekati gambar originalnya.
Analisis Volume, Kecepatan, dan Kepadatan Lalu Lintas dengan Metode Greenshields dan Greenberg Widodo, Wahyu; Wicaksono, Nur; Harwin, Harwin
Jurnal Semesta Teknika Vol 15, No 2 (2012): NOVEMBER 2012
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The creation of a transportation system that ensures the movement of people, vehicles, or goods in a smooth, safe, fast, cheap, convenient, and environmentally friendly way has been the goal of country development. An increase in traffic volume will cause a change in traffic behavior. Theoretically, there is a fundamental relationship between the flow, speed, and density of traffic. Activities and land use will affect the performance of a variety of roads. Land in Jalan Wates Km 5 is used as commercial and market area that is the center of the crowd. The purpose of this study was to determine: speed, traffic volume, density, capacity, and the relationship between speed, volume and density using Greenshields and Greenberg methods, degree of saturation, and level of service. The study was conducted in one day. The result showed that the capacity of the road is still able to accommodate the volume of existing traffic.
Desain Kontrol Beban Elektronik pada Pembangkit Listrik Tenaga Mikrohidro Effendy, Machmud
Jurnal Semesta Teknika Vol 12, No 2 (2009): NOVEMBER 2009
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Due to its lower cost and quicker response in compassion with governor, electronic load control (ELC) has been widely used to replace governor in microhydro power plant. It has lower price and quicker response than governor. The synchronous generator used in microhydro power plant produces stable voltage, because it has been controlled by an AVR (automatic voltage regulator. If consumer loads changes, the frequency not the voltage of the electrical wave will change. Therefore, ELC is used to stabilize the electrical wave frequency and detect the change of consumer load to be transferred to ballast load. This ELC uses frequency censor to detect the change of consumer load. Frequency censor proceeses linearity level to the change of voltage which equals to R2= 0.97. The use of ELC causes the generator voltage is approximately 220,3V to 224,4V with percentage of voltage unbalance 0,56% and the geneator frequency is 49,5Hz to 50,1Hz with percentage of frequency unbalance 0,41%.
Karakterisasi Aliran Uap-Kondensat pada Saluran Mendatar Berdasarkan Pengukuran Temperatur Sukamta, Sukamta; Indarto, Indarto; Purnomo, Purnomo; Rokhmat, Tri Agung
Jurnal Semesta Teknika Vol 17, No 1 (2014): MEI 2014
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The objective of the current investigation is to find out temperature distribution regimes in a horizontal pipe when condensation process is happened.  The research was conducted at Pusat Studi Ilmu Teknik Universitas Gadjah Mada. The experiment apparatus consists of an inner annulus pipe made from copper (din = 17.2 mm, do = 19 mm) with the length of 1.8 m. The outer annulus pipe is a galvanized iron pipe (din = 108.3 mm, do = 114.3 mm) with the length of 1.6 m. Thermocouples type K 36 TT OMEGA with chromel (+) and alumel (-) materials were used as temperature sensors, to detect the spread of temperature in radial or axial direction along the pipe. The measurement ranged from -50 to 260 oC, with an accuracy of 0.01 °C. A data logger of RX 40 serial (OMRON, 20 Channels) was used to read and record temperature data with the sampling rate of 5 Hz. In the experiment, the water (H2O)was heated using a boiler to generate steam which was then flowed and condensed inside the annulus pipe to form a steam-condensate two-phase flow in horizontal pipe. On the other hand, the water was used as a coolant in the outer of annulus pipe. The results indicated that the temperature distribution regimes are influenced by axial posisition.The farther distances from the inlet the lower the temperatures being recorded which indicate the increase of film condensate thickness. Such phenomena can affect slugging in the location.
Pengaruh Perlakuan Panas Terhadap Struktur Mikro Logam St 60 Yani, Rina Dwi; Pratomo, Tri; Cahyono, Hendro
Jurnal Semesta Teknika Vol 11, No 1 (2008): MEI 2008
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This research aim to know the transformation of microstructure and it influence to ST 60 when its heated by heat treatment process. Specimen heated and arrested at temperature 800°C during 30 minutes, then is cooled with water coolant. Hardness of test piece is measured [by] before and after heat treatment by using method Rockwell C. Microstructure of metal photograph take by using special camera, and it presenting in millimeter block to calculate ferrite and pearlite content percentage. Result of research indicates that heat treatment to metal ST 60 causing microstructure change and percentage of ferrite was increase, directly causes material hardness value  increase too.

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