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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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Perbandingan Analisis Two Way Slab With Beam dengan Flat Slab (Studi Kasus: Coal Yard PLTU Kalimantan Barat) Syamsi, Muhammad Ibnu
Semesta Teknika Vol 18, No 2 (2015): NOVEMBER 2015
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Abstract

Floor slab of coal yard as a storehouse was designed as two way slab with beam and flat slab in order to compare those two systems based on needs of materials and ease of implementation. The design process is based on the provision of SNI 03-2847-2002. Through the design results and analysis of material requirements can be concluded that the need for concrete material on a flat slab system is 2.1% greater than on the two way slab with beam. Meanwhile the steel material requirements for flat slab system is 9.7% greater than two way slab with beam. However, in term of ease of implementation, relatively flat plate systems are superior to the briquette plate system because the number of items of work a little more
Peningkatan Efisiensi Kompor LPG dengan Menggunakan Elemen Bara Api sudarno, Sudarno sudarno; Fadelan, Fadelan
Semesta Teknika Vol 19, No 2 (2016): NOVEMBER 2016
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The defective combustion process is one of the causes of low efficiency in LPG stoves. Increasing the efficiency in LPG stoves by optimizing the combustion has high possibility to do. Practical effort that can be done is adding the element embers. This tool is a woven wire nikelin that are arranged in layers and if it is heated, it will be incandescent, forming high temperature embers. Generated embers will be able to burn fuel vapor perfectly around the wire, so it will broaden the mature fire area. The test is done by using LPG stoves which is provided by finned heat radiation reflector. The efficiency test is done by conducting the boiling water test. The number of element embers layers are varied, from one to four layers. The performance of element embers use is compared with LPG stoves without element embers use. In this study, temperature distribution for each treatment is tested. It is obtained that the use of element embers without reflector can improve the efficiency until 8.23%. The highest efficiency occurred in one of layer element embers use, as much as 61.7%. But, the increase of element embers in finned heat radiation reflector decreased the efficiency. It was because the mounting pattern of element embers bothered the function of the reflector, so the heat reflection from the reflector was stunted and stuck between the reflector and the mounting pattern. Therefore, the heat energy of the reflection from the reflector cannot be moved to combustion area. The result of temperature distribution test also showed that the element embers use could broaden the mature fire area.
Deteksi Cacat Bantalan Bola Pada Pompa Sentrifugal Menggunakan Spektrum Getaran Kamiel, Berli P; Mulyani, Mulyani; Sunardi, Sunardi
Semesta Teknika Vol 20, No 2 (2017): NOVEMBER 2017
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Abstract

One of the common fault in the centrifugal pump is faulty bearing. Bearings play a very important role for smooth rotation of a shaft. A bearing condition must be constantly monitored to ensure top performance of a pump. Therefore, a method is needed to detect an early defect in the bearings. One of the most widely used methods for bearing faults detection is based on the vibration analysis. Vibration analysis can detect a defect in a bearing without having to disassemble the machine. Furthermore, and it is fast and easy to be implemented. This study aims to develop a fault detection method on the ball bearing using spectrum analysis by applying envelope analysis. This research uses experimental method with three bearings conditions i.e. normal (no fault), outer race fault, and inner race fault. The type of ball bearings used are self aligning double row bearings. The vibration signal from each of bearing condition is taken from the centrifugal pump vibration test rig and measured using accelerometer sensor which is acquired directly with DAQ and then processed into Matlab. The analysis gives the result of frequency spectrum and envelope spectrum. This study concludes that the high amplitude on the frequency that coincide with the frequency of Ball Pass Frequency Outer Race (BPFO) and Ball Pass Frequency Inner Race (BPFI) make an indication of damage to the bearing on the outer and inner race respectively. The envelope spectrum gives better results as compared to the result of the frequency spectrum. This is because the high amplitude of low frequency generated from other components is blocked and removed using a high-pass filter. Consequently, it becomes easier to detect a low amplitude of high frequency vibration signal from a faulty bearing.
Analisis Tarikan dan Bangkitan Perjalanan Akibat Pembangunan Mix-Used Plan (Mix-used JogjaOne Park) dengan Metode Pembanding Muchlisin, Muchlisin
Semesta Teknika Vol 19, No 2 (2016): NOVEMBER 2016
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Developing an hotel, apartment, condotel, housing, malls and plazas often happens in various corners of the Yogyakarta region. This fact is also triggered increasingly high demand for housing in the city (city living) which is adjacent to the location of work, study or daily activities or in this case is a mix-used planning called Mix-Used JogjaOne Park (JOP). This study aims to determine the magnitude of the impact of traffic on the trip generation and attraction caused Mix-Used JogjaOne Park (JOP) either on the existing condition or when operational in 2020 and 2025. The method used to predict the method of traffic generation using a comparison against similar activities. For comparative exercise activity, is used as a comparison Ambarukmo Plaza mall and shopping activities. While Mataram City as a comparison of activities and hotel apartments. Indonesian Highway Capacity Manual 1997 is used to determine the performance analysis of the road network. From the analysis conducted, the performance conditions on Jalan Adi Sucipto still at LOS D (DS <0.9) on the existing conditions, while at operaisonal at LOS E (DS <1). The condition is not signalized intersection Babarsari - Jl. Adi Sucipto at LOS B (average delay of 5.1 to 15 sec / veh) on condition eksiting, while the LOS still operational at the signalized intersection LOS B. In the East Ringroad - Jl. Adi Sucipto at LOS F (delay (sec / veh)> 60) on condition eksting, while also operating at LOS F. And at three signalized intersections Janti Fly Over at LOS D (delay average is 25.1 to 40 seconds / veh) on condition eksting, whereas when operating at LOS E ((delay average is 40.1 to 60 sec / veh).
Performance of a 160 cc Four-Stroke Engine Using Non-Programmable Aftermarket CDI and Aftermarket Ignition Coil When Operating With Three Types of Gasoline Nurcahyadi, Teddy; Wahyudi, Wahyudi; Ruswanto, Dwi Isnaini; Ramadhani, Fithrio Manggala; Sidiq, Burhannudin; Handoko, Wahyu Tri
Semesta Teknika Vol 20, No 2 (2017): NOVEMBER 2017
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Ignition timing and output voltage must be re-tuned when the engine used different types of fuel.  This research aimed to investigate the effectiveness of CDI and ignition coil upgrade, both separately and combined, when various types of fuel was used by the engine.  This research was done on a 160 cc four-stroke engine of a Honda motorcycle with compression ratio 9:1.  The types of fuel used by the engine in this research was RON 88, RON 90, and RON 95 gasoline fuels. The engine’s torque was measured on an inertial type motorcycle chassis dynamometer.  The fuel consumption data was obtained by on road test, the value of the data was calculated by dividing the distance being traveled with the volume of fuel being consumed. The result of this research showed that when RON 88 gasoline was used, the influence of aftermarket CDI and aftermarket ignition coil gave almost comparable impacts to the increase of torque.  The combination of aftermarket CDI and aftermarket ignition coil was found to influence the largest torque increase percentage of 5.3% when RON 90 gasoline was used.  When RON 95 gasoline was used, the aftermarket ignition coil influenced the largest torque increase percentage of 4.3% at lower engine speed and 7.4% at higher engine speed.  The aftermarket CDI and aftermarket ignition coil, whether used separately or combined, always gave worse impact to fuel consumption when RON 88 and RON 90 gasoline was used. The opposite is true when RON 95 was used.
Kajian Kuat Tekan Material Tanah Lempung dan Pasir Berbahan Campur Sampah Plastik Rumah Tangga Maulana, Taufiq Ilham
Semesta Teknika Vol 19, No 1 (2016): MEI 2016
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In Indonesia, the waste has become a national issue which must be managed in a comprehensive and integrated from upstream to downstream in order to provide economic benefits, healthy for the community, and safe for the environment, and can change peoples behavior. From various types of waste, plastic is a very dangerous household waste. One effort to reduce dam use plastic waste is to be made as mixing clay and sand to produce material that can be used as building materials. In this research molten plastic waste was mixed with clay and sand with variations of ratio plastic-sand and plastic-clay is 1: 2, 1: 3 and 1: 4. The results revealed that the optimum ratio of plastic-sand mixture is 1: 3 with a compressive strength of 13.5 MPa and the optimum mix of plastic-clay is 1: 2 with a compressive strength of 14.21 MPa. The collapse pattern that occurred in the plastic-sand mixture was shear failure that caused test object splitting, while the plastic-clay mixture is shear failure, but without causing the test object splitting. 
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.
Gaya Lateral In-Plane Struktur Portal Dinding Pasangan Bata ½ Batu Melalui Analisis Numerik Prayuda, Hakas
Semesta Teknika Vol 18, No 2 (2015): NOVEMBER 2015
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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.
Pengaturan Lalulintas Kereta Api di Stasiun Cicalengka untuk Mendukung Pengoperasian Jalur Ganda Kereta Api Bandung-Cibatu Setiawan M, Dian; Devi P, Rahardhita Luthfiana; Rosyidi, Sri Atmaja P
Semesta Teknika Vol 21, No 1 (2018): MEI 2018
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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%.
Kajian Angkutan Sedimen Di Sungai Pabelan, Kabupaten Magelang, Jawa Tengah Fauziyah, Risky; Kironoto, Bambang Agus; Legono, Djoko
Semesta Teknika Vol 21, No 1 (2018): MEI 2018
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Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.211210

Abstract

Pabelan River is one of the rivers in the western slopes of mount Merapi located in Magelang Regency, Central Java province. Pabelan River has watersheds ± 84,70 km2 with the main river length ± 28,40 km2. The purpose of this research was to estimate the amount of sediment transport that occurred at the point of view in the Pabelan River and to know estimate of sediment balance that occurred at the point of view in the Pabelan River. This research was conducted to find out the sediment balance in the Pabelan River whether going on degradation, aggradation, or experience the equilibrium transport. Calculation of sediment balances based on the volume of sediment transport entering at the location selected. Based on the results of sediment transport analysis using MPM, EINSTEIN, DU BOYS and ROTTNER formula, the largest sediment transport volume occurred in PA-C 5 = 4850,592 m3/m/flood, 305,8398 m3/m/flood,  20321,979  m3/m/flood  and 80274,221 m3/m/flood, while the result of calculation based on formula FRIJLINK largest sediment transport volume occurred at PA-C 3 = 3654,817 m3/m/flood. To obtain the result of equilibrium sediment that occurred in the river of research  is by using the five formula  with the condition of the river that occurred aggradation and  degradation with the biggest condition is the result of calculation with the formula ROTTNER for aggradation occurs in PA-C X Prumpung  amount of 47272,806 m3/m/s with increase river bed amount of 13,504 m and degradation occurred at PA-C 5   -47468,692 m3/m/s with decrease at river bed -23,698 m.

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