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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 20 Documents
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Search results for , issue "Vol 20, No 1 (2017): MEI 2017" : 20 Documents clear
Analisis Kekuatan Lentur Balok Aplikasi Tulangan Komposit Dengan Perlakuan Bedamutu Marsudi, Marsudi; Martono, Martono
Semesta Teknika Vol 20, No 1 (2017): MEI 2017
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Concrete has a very high compressive strength, while tensile strength only 10 % from compressive strength. Concrete as building materials have varying prices depending on the quality of the concrete. The use of different concrete quality is expected to reduce production costs with the same strength. Steel concrete is the product can not be update, whose existence will someday be exhausted. To overcome these problems, As a replacement alternative is the use of bamboo reinforcement with wire bendrat that cost cheaper and high strength. In this research steel concrete is replaced the bamboo reinforcement with give bendrat wire is used of a simple concrete beam reinforcement. All beams concrete are given bamboo reinforcement with wire bendrat. The final results of research will known how big and ability beam modification with reinforcement of bamboo petung with the wire bendrat in receive bending style. Slump test, the test result is 7 to 10 cm. From the test results strength urge concrete cubes can be deduced that the average compressive strength of concrete K-150 is 157 kg / cm2 means that the average concrete has a quality K-157, higher than the planning the quality of (K-150) , then to the quality of concrete K-225, the average compressive strength of concrete have the quality of K-229, higher than the plan that is the quality of (K-225). Results of testing the tensile strength of concrete steel Ø 6 mm obtained an average value of 15 kN, whereas tes result for the reinforcement of bamboo petung profile that diprofil with bendrat obtained average value of 12 kN. Flexure testing result revealed that the quality of concrete beam strength of K-225 gained an average of 36.67 kN, while to the quality of K-150 in get strength 27 kN. The modification concrete beam different quality concrete with reinforcement bamboo petung reinforcement with is given bendrat wire is average test results research of 28.33 kN,while for testing concrete beam reinforced steel with different quality, the research result of flexure test give results 36.33 kN.
Pengaruh Kecepatan Operasi Pompa Sentrifugal Terhadap Sensitifitas Metode Deteksi Fenomena Kavitasi Berbasis Parameter Statistik Domain Waktu Kamiel, Berli P; Ramadhan, Ray S
Semesta Teknika Vol 20, No 1 (2017): MEI 2017
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Cavitation is one of the main concern on centrifugal pump faults that could cause component damages up to production failure in the industries. It is essential to detect and diagnose the fault as early as possible to prevent a catasthropic failure. Cavitation on sentrifugal pump could be caused by many factor, one of them are caused by the pump operating speed. This paper presents a method that able to detect cavitation by monitoring the vibrations level of the pump based on statistical analysis of time domain. This method is known as vibration monitoring technique that is undoubtedly the most effective technique to detect rotational machinery faults. The cavitation simulated on the test rig by varying the operating speed at 1000 RPM, 1200 RPM, 1400 RPM, …, 2600 RPM and by varying the size of suction valve opening. The cavitation phenomena are measured and indicated by magnitude of vibration level changes in stastical parameter such as Probability Density Function (PDF), Variance, Standard Deviation, Root Mean Square (RMS), Peak Value, Crest Factors and Kurtosis. The results show that PDF, Variance, Standard Deviation and RMS are proved to be able to detect cavitation caused by the pump operating speed variation. However, parameter such as Peak Value, Crest Factor and Kurtosis show low sensitivity and not suitable for the cavitation detection purposes.
Analisis Nyala Torch Oksidasi Pada Oxy-Acetylene Terhadap Sifat Fisik Dan Mekanik Sambungan Las Pelat Baja Karbon Rendah Wisnujati, Andika; Kartika, Rivaldy M
Semesta Teknika Vol 20, No 1 (2017): MEI 2017
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Oxy-acetylene welding is widely used in small workshops for car body repair, automobile and motorcycle exhaust, and other improvements using a maximum temperature of 3000oC that can not be done through another process. The purpose of this study was to analyze the effect of torque oxy-acetylene flame on the physical-mechanical properties in welding connection low carbon steel plates . The method used by using a low carbon steel plate 2 (two) pairs in a butt weld dimmension of  300 mm x 75 mm x 1 mm. After welding with oxy-acetylene in torch oxidation flame, the specimens were  examined through physical observation including microstructure and mechanical properties. Micro hardness vickers was used to evaluate the hardness. Tensile properties was determine using the universal testing machine. In the microstructure testing, there is a pearlite and ferrite whose become different dimensions as it is affected by the heat and air pressure of the weld. Mechanical testing that is tensile test obtained yieldpoint of the specimen A 125,17 N/mm2 and specimen B 126,55 N/mm2. The result of tensile strength specimen A 166,35 N/mm2 and specimen B 169,76 N/mm2. While the vickers test obtained the highest hardness that is 152.5 VHN in the welding area, and the lowest hardness number is 124,9 VHN in the heat affected zone.
Disain Dan Fabrikasi Mesin Sputtering Skala Laboratorium untuk Penumbuhan Film Tipis Muhammad, Bagja Restu; Nugroho, Aris Widyo
Semesta Teknika Vol 20, No 1 (2017): MEI 2017
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Plasma sputtering is well known method for preparation of thin films on various substrates. This technique involves expelling material from a target onto substrate in a vacuum chamber. Generally, the technique is equipped with argon supply system for ionized gas bombardments of the target. This work shows designing and fabricating process of a simple sputtering machine without gas supply system and its preliminary thin film preparation test. A CAD software was applied to design its main apparatus namely a vacuum system and an electrical system. Afterward, those apparatus were fabricated and assembled. Preliminary test was conducted using a cooper plate as a target and plate glasses as substrates for 90 s and 130 s processing time. The vacuum pressure, voltage and the electric current were set up at 10-2 torr, 150 volt and 1 A, respectively. The thin film on the glass was visually examined and  its resistivity was measured using ohm meter. The results show that a cooper thin film has been coated on the glass with the resistivity of 12.6 and 9 Ω. At this stage , it is confirmed that the plasma sputtering machine being fabricated has successfully worked.
Perencanaan dan Simulasi Jaringan Small Cell Indoor Hotspots Studi Kasus di Gedung Vokasi Universitas Telkom Nugraha, Toha Ardi
Semesta Teknika Vol 20, No 1 (2017): MEI 2017
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Poor signal in indoor celluler network is caused by attentuation of the building  partition. In indoor areas, signal from base station transmitter cannot received perfectly in the receiver part. Therefore, this study discusses about planning of Indoor Hotspot (InH) using Small Cells technology case studi in Vocational Building Telkom University. From the network simulation, the  transmit power of the entire antennas can cover each floor as well with received signal level greater than -80 dBm with SIR level has positive value above 0dB. The lowest floor, the average received signal power values is the best value compare with the others with  received power about -40 dBm using 6 InHs. SIR best quality on the first floor of the building with the average received signal quality value of about -50 dBm using 7 InHs.
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) Dinata, Doni Ikrar; Rahmawati, Anita; M, Dian Setiawan
Semesta Teknika Vol 20, No 1 (2017): MEI 2017
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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.
Sistem Pengenal Wicara Menggunakan Mel-Frequency Cepstral Coefficient Putra, Karisma Trinanda
Semesta Teknika Vol 20, No 1 (2017): MEI 2017
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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%.
Implementasi Sistem Monitoring Deteksi Hujan dan Suhu Berbasis Sensor Secara Real Time Mustar, Muhamad Yusvin; Wiyagi, Rama Okta
Semesta Teknika Vol 20, No 1 (2017): MEI 2017
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The aim of this research is to provide the design and implementation of a monitoring system which is able to detect rain and temperature based on real time sensor. This system focuses on the results of raindrop detection sensor as a rain detector and NTC thermistor as a temperature detector. Both of the sensors have an analog output. Therefore, they require an Analog Data Converter (ADC) to measure. Several tools are used to build this monitoring system, including microcontroller Arduino NANO for input sensor value readings, data processing and programming. Real Time Clock (RTC) is used to provide time information when the sensor works, as well as the telemetry as the wireless communication device. An interface based on Graphical User Interface (GUI) using JAVA as the monitoring software which can be operated on a PC or laptop. Based on the analysis and evaluation, this tool can detect rain and temperatures in real time.
Studi Literatur Tentang Program Pump System Improvement Modeling Tool Untuk Penyempurnaan Kinerja Sistem Pompa Sukamta, Sukamta; Husda, Syamsul Muarif; Caroko, Novi
Semesta Teknika Vol 20, No 1 (2017): MEI 2017
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In the industrial world often encountered actual loads do not match the design load.  These differences lead to energy wastage. Pumping system is one of the systems that always exist in the industry. Improving of pumping system performance is an important step in saving energy. Impeller trimming is one method to improve the performance of the pump system. One of the obstacles in performing the impeller trimming method is to determine the magnitude of the impeller diameter reduction to be performed. Currently, many software developed to improve the performance of pumps and pumping systems. One of the softwares is Pump System Improvement Modeling Tool (PSIM). Imprimer trimming method is one of the features in PSIM. To be optimal in the use of PSIM in the improvement of the pump system it is necessary to conduct a literature study on PSIM to improve the performance of the pump system. In this article has been studied PSIM literature on the process of perfection of centrifugal pump system with impeller trimmer method by taking case study on hot water provider system. The method used in this literature study is by comparing the results of PSIM calculations on case studies with the pump theory of the impeller trimming method. Through this comparison will be known the advantages of PSIM and weaknesses, PSIM calculation margin error compared to the theoretical calculations. By knowing these things then it can be determined the limits of the use of PSIM in the improvement of pump system performance. The result of analysis shows that PSIM trimming impeller calculation is based more on the calculation according to affinity law than any other theory, even in the calculation there is error margin. The tendency of data is the greater the value of the reduction the greater the deviation. If based on the theory then the calculation of PSIM which can be used as a guide in calculating the reduction of diameter is a maximum reduction of 15% or 85% of the original diameter. A larger reduction of the value needs to be re-measured to the characteristics of the pump system.
Penerapan Metode “Earn Value” Dan “Project Crashing” Pada Proyek Konstruksi: Studi Kasus Pembangunan Gedung IGD RSUD Sunan Kalijaga, Demak Priyo, Mandiyo; Zhafira, Talitha
Semesta Teknika Vol 20, No 1 (2017): MEI 2017
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Project of  construction have unique characteristic. Process os construction will not continued by the other project. It caused by the condition that affect by the other project.  The controlling of project is required to maintain compatibility between planning and actuating. Every activity that held in project must be do inspection and checking with spesification that used. The aim of the researchis determine the performance of project in terms of time and fixed cost. Beside that, This research intend to estimate time and cost for finishing project, and determining project performance index. Data that used for this is secondary data. Secondary data are obtained from contractor. There are budget plan, weekly report, progress report, and fixed cost of project. Research methode that used is Earned Value Methode. It could be analysis from schedulling, cost, and visualisation achievement jobs.  From this methode is obtained  estimation of cost and time to finishing project. This analysis is done by software Microsoft Excel.2010. Based on 19th week, The result show that have planned Value (PV) sebesar Rp.3.981.025.497,26, nilai Earned Value sebesar Rp. 4.835.552.298, dan nilai Actual Cost sebesar Rp.3.409.775.000,00. Based on  Cost Varian sebesar Rp. 1.425.777.298,00 dan Cost Performance Index = 1,418 that the project have profit. From the schedulling project aspect is accelerating 5 week from the project schedule planning. It shows by the schedule varians Rp. 854..526.800,74 and schedule performance indeks = 1,215. Estimating cost to finishing project is Rp 4.950.908.465,70.

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