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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 13, No 1 (2010): MEI 2010" : 20 Documents clear
Perbaikan Sifat Mekanis Batu Bata Tanpa Dibakar dengan Campuran Limbah Karbit dan Abu Sekam Padi Andre, Yosi; Siagian, Taufik Nugraha
Jurnal Semesta Teknika Vol 13, No 1 (2010): MEI 2010
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Brick is one important element in a building. Bricks are generally made by burning dry clay , and this process will emit air pollutant. In addition, the bricks that widely available on the market have a poor quality. Therefore, the quality of bricks needs to be effectively improved by means of environmentally friendly and low cost procedure. This research aims to improve the mechanical characteristics of unburnt bricks by adding a mixture of calcium carbide residue (CCR) and rice husk ash (RHA). In this study, the effect of the percentage of additive material and the proportions of CCR and RHA on the mechanical properties are studied. The results showed that the compressive strength of bricks is influenced by the content of additive material. In addition, the optimum compressive strength was found to be after 21 days of cating for all additive material, afterwhich the strength sarted to decrease. Bricks possessing the highest compressive strength are those produced with 70% additive and CCR-to-RHA ratio of 2/1. The compressive strength reached 125.91 kg/cm2 after 21 days of moulding.
Model Power Sistem Stabilizer Berbasis Standar IEEE untuk Stabilitas Transien Sistem Tenaga Listrik Jamal, Agus
Jurnal Semesta Teknika Vol 13, No 1 (2010): MEI 2010
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Power System Stabilizers (PSS) are added to excitation systems, in order to enhance the damping of electric power system during low frequency oscillations. For large scale power systems comprising of many interconnected machines, the PSS parameter tuning is a complex exercise due to the presence of several poorly damped modes of oscillation. The problem is further being complicated by continuous variation in power system operating conditions. In the simultaneous tuning approach, exhaustive computational tools are required to obtain optim um parameter settings for the PSS, while in the case of sequential tuning, although the computational load is fewer, evaluating the tuning sequence is an additional requirement. There is a further problem of eigenvalue drift. This research proposes the PSS model based on IEEE Standard 421.5 PSS 4B for designing robust power system stabilizers for a multi machine system. Simulations were carried out using several fault tests at transmission line on a Two-Area Multimachine Power System. As a reference the PSS model, Delta w PSS and Delta Pa PSS has been used for comparison with the PSS under consideration. The result shows that power transfer response using the model is more robust than Delta w PSS and Delta Pa PSS, especially for three phase faults and phase to ground faults.
Perkuatan Lentur Pelat Lantai Tampang Persegi dengan Penambahan Tulangan Tarik dan Komposit Mortar Hartono, Juandra; Satyarno, Iman; Triwiyono, Andreas
Jurnal Semesta Teknika Vol 13, No 1 (2010): MEI 2010
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Overloading of structures can cause failure. In order to continue using them, strengthening is required. In this research elastic strengthening was carried out on concrete floor plates by means of tensile reinforcement addition, and mortar composite additionto apply epoxy resin. Four reinforced concrete slabs, consisted of one control slab (PK), one monolith slab (PM), one strengthened slab (PPE) and one unstrengthened slab (PPTE). Specimen dimensions were 700 mm x 1500 mm x 60 mm for the PK, and 700 mm x 1500 mm x 100 mm for the others. Specimens were placed on a simply supported loading frame, and statically loaded at their mid-span. Numerical analysis using Response-2000 software package was carried out for comparison with the experiment al result. It was found out that the flexural capacity of the PK, PPE, PPTE and PM specimens are 5,99 kNm, 12,52 kNm, 13,87 kNm and 21,38 kNm, respectively. In comparison with that of thePK, flexural capacity of the PPE and PPTE specimens was found to increase by 109,019 % and 131,55 %, respectively. The increase of stiffness was 324,77 % and 430,21 % for the PPE and PPTE specimens, respectively. The ductility factor of the PPE and PPTE increase 29,63 % and 19,03 %, respectively . The PK and PM specimen s experienced flexural failure, while the PPE and PPTE specimens experienced debondingfailure.
Analisis Kapasitas dan Efisiensi Pembersihan Mesin Pembersih Biji-Bijian Sistem Blower untuk Produksi Pakan Burung Olahan Rofarsyam, Rofarsyam
Jurnal Semesta Teknika Vol 13, No 1 (2010): MEI 2010
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The optimum cleaning capacity and efficiency of sheed processing in bird food production have been investigated by employing dimensional analysis. The types of grains, grain weight, blowing speed, hight and width of grain-fall were varied in order to obtaine the capacity, processing time and the cleaning degree data of the machine under investigation. The data were then analyzed to determine the product capacity-processing parameter, and efficiency-processing parameter relationships. It was con cluded that two mathematical model of product capacity-processing parameter relationship and efficiency-processing parameter relationship were governed from this study. These mathemetical models can be further used as a reference for determining the dimensions in manufacturing and operation blower system cleaning machine, in order to achieve its maximum cleaning capacity and efficiency.
Kajian Eksperimen Kuat Tekan Beton Ringan Menggunakan Agregat Bambu dan Bahan Tambah Beton Endarto, Muhammad Riang; Zulfiar, Muhammad Heri
Jurnal Semesta Teknika Vol 13, No 1 (2010): MEI 2010
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The use bamboo as a substitute aggregate is an effort to reduce the density and static load of structural elements. This reseach focuses on the problem related to the specific gravity and compressive strength of the use of bamboo as a lightweight concrete aggregate. Specimens were produced using additive and 10 mm maximum grain size of bamboo agregate as a substitute for split aggregate, in a lightweight concrete composite systems. Variation of bamboo content as a substitute aggregate were selected being 0% (normal), 20%, 40%, 60%, 80% and 100% by weight of split aggregate. The samples are in the form of cylinder (of 15 cm diameter and 30 cm height), while the compression testing were performed after 14 days of treatment. The results showed that the lightweight concrete containing 80% of bamboo aggregate possessing compressive strength 5,86 MPa, which is below the minimum standard of ACI of 17,2 MPa.
Kinerja dan Verifikasi Teknik Seismik Gelombang Permukaan Terintegrasi untuk Pengukuran Modulus Elastisitas Tanah Dasar Rosyidi, Sri Atmaja P
Jurnal Semesta Teknika Vol 13, No 1 (2010): MEI 2010
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An integrated-spectral analysis of surface waves (ISASW) test has been recently proposed as an alternative technique in pavement evaluation and monitoring. ISASW technique is developed from the spectral analysis of surface wave (SASW) method which has been a well known nondestructive testing (NDT) for geotechnical and pavement structures. Surface wave propagation between a set of receivers were transformed to frequency domain using fast Fourier transform (FFT). Therefore, a phase spectrum was produced for measuring the time lag between receivers. A wavelet filtering on impulse response was used for constructing an enhanced phase spectrum. Using phase different method, an experimental dispersion curve was generated. Inversion analysis based on the 3-D stiffness matrix method was then performed in order to produce the shear wave velocity profile. The elastic modulus of pavement layer was calculated based on the linear elastic theory. In this paper, the performance of ISA SW measurement for determining the elastic modulus of pavement subgrade is presented in this paper. Verification on its elastic modulus obtained from ISASW technique was also conducted by using falling weight deflectometer (FWD) test. The result shows that the dispersion curves obtained in the ISASW test are sensitive to indicate the stiffness change in each layer of a pavement structure. Stiffer layer, i.e., pavement surface layer, can be indetified by the parameter of high frequency and phase velocity range; and vice versa. ISASW technique is also able to comprehensively investigate the elastic modulus of subgrade layer in exisiting pavement without any destruction. A good agreement of elastic modulus of subgrade layer from ISASW and FWD test was also pres ented.
Pengujian Kinerja Pompa Sentrifugal Menggunakan Kontrol Inventer Putro, Wahyu Djalmono
Jurnal Semesta Teknika Vol 13, No 1 (2010): MEI 2010
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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.
Measurement of Elastic Strain Wave Propagation Velocity Using FRSGs along Metallic Rods Subjected to Impact Load Sudarisman, Sudarisman
Jurnal Semesta Teknika Vol 13, No 1 (2010): MEI 2010
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The accuracy of foil resistance strain gauge (FRSG) for strain wave propagation measurement along metallic rods, i.e. aluminium, brass, copper and steel rods, subjected to impact load has been investigated. Hexagonal cross section of 5/8” sides × 6’ long metallic rods have been selected for specimens. At a distance of 8” from one end of each rod, an EA-09-125AD-120 type foil resistance strain gauge with gauge factor of 2.105 and resistance of 120W was installed. The rods were then placed on a pair of supports and loaded at the other end surface with an impact loading generated using an impulse hammer. The set up was also instrumented with a typical potentiometer circuit as a signal transducer, and an oscilloscope for signal acquisition. The output signals were then analysed by comparing with their respective theoretical values. The result showed that these FRSGs had demonstrated high accuracy in signal sensing indicated by negligible discrepancies between experimental values on one hand and their respective theor etical values on the other hand.
Karakteristik Parkir di Rumah SakitKostati Surakarta Suwardi, Suwardi
Jurnal Semesta Teknika Vol 13, No 1 (2010): MEI 2010
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Parking is very crucial, mainly in the city areas. It often disturbs the traffic. Nowadays, many hospitals provide insufficient parking areas. This research was carried out in the Kustati hospital, Surakarta. The aim of the research is to study the parking characteristic that is expected t o be useful in planning and managing the future parking in the Kustati hospital. The result showed that the existence of parking maneuver and the service degree of traffic in front of the Kustati hospital is ranging between C and D because of parking influenced to be D and E. The parking influenced maneuver towards the decrease of speed found out to be y = 31.3x + 14.22. The average parking accumulation of motor cycle maximum is 701. The average maximum of parking index is 123%. The majority of parking duration is 6 up to 7 hours (29 vehicles). The parking volume is about 1757 vehicles. Parking turn over is 3.1 vehicles . Therefore, it requires 198 m2 of additional parking area. The average of maximum of car parking accumulation is 84 cars. The maximum parking index is 105%. The majority of parking duration is 5 up to 6 hours (41 cars). The parking volume is 245 cars. Parking turn over is 3.1 cars.
Identifikasi Pola Aliran Dua Fasa Uap-Kondensat Berdasarkan Pengukuran Beda Tekanan pada Pipa Horisontal Sukamta, Sukamta; Indarto, Indarto; Purnomo, Purnomo; Rohmat, Tri Agung
Jurnal Semesta Teknika Vol 13, No 1 (2010): MEI 2010
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An experiment of two-phase flow patterns of steam-condensate based on differential pressure measurement in horizontal tube was conducted by varying the flow rate of the steam. The experiment utilised annulus pipe with inner section test pipe was made from copper and outer section was made from Galvanized Iron Pipe (GIP) wrapped with a 10-mm-thick insulation. The pipe was 1.6 meter length, and 4 inch outer diameter and 17 mm inner diameter. The two-phase flow regime was investigated based on pressure gradien between its inlet and outlet. In order to support the result, visualition was conducted using a ¾ inch diameter and 1.3 m length of transparent pipe connected with the test pipe section. Five variations of steam flow rate ranging from 0.00211361 m3/s to 0.007078511 m3/s were selected. The results show that for lowest steam flow rate, stratified flow pattern was identified while for the ot her variations, stratified, wavy, plug and slug flow pattern were observed. Wavy flow pattern occured on transition of stratified to slug or plug. Annular flow pattern was not observed in this experiment. Generally speaking, an increase in steam flow rate resulted in a more significant pressure gradient signals.

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