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Simetris
Published by Sekolah Tinggi Teknologi Ronggolawe Cepu
ISSN : 16937066     EISSN : 2686312X     DOI : https://doi.org/10.51901/simetris.v14i2.124
Core Subject : Engineering,
Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Industrial & Manufacturing Engineering Mechanical Engineering
SIMETRIS: The Journal of Technology and Applied Science is a scientific journal published regularly every six months, namely June and December. SIMETRIS: Journal of Technology and Science Accepts articles from various groups covering the study and application of theory, research results, interesting conceptual ideas in the fields of engineering and applied science. The editorial team will decide on the selection of articles to be published after receiving the results from the expert editing team. Authors will be given input from the expert editing team. SIMETRIS: Journal of Technology and Applied Science contains research articles or literature studies in Indonesian and English.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 148 Documents
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Kaji Eksperimental Efek Separasi Flow Pada Arah Radial Terhadap Performa Rectangular Elbow Dengan Variasi Bilangan Reynolds Drajat Indah Mawarni
SIMETRIS Vol 9 No 1 (2015): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

This study aimed to determine the effects of flow separation on the distribution pattern statics pressure recovery in the flow through the rectangular elbow. The study was conducted experimentally by measuring the static pressure at the area of radius r at the center of curvature. Pressure measurements were made with three variations of the Reynolds number (Re). The results of the measurement of static pressure generally indicates that the flow pattern in the radial direction is formed does not undergo significant changes with the change of Reynolds number / flow rate. The results of measurement obtained information that has outerwall side pressure coefficient (Cp) is positive, while in the inner side wall has a pressure coefficient (Cp) is negative. This shows that the outer side has a greater pressure than the inner side. In the radial direction the pressure coefficient (Cp) increased as you bend radius of curvature rectangular, which means that the larger the finger - the finger curvature, stress the fish is also getting bigger. This research has not found any effect on the pattern of change in Reynolds number and flow characteristics that form the radial direction passing through the channel testing.
Study Perbandingan Analisis Kuat Tekan Beton Antara Metode Perancangan Amerika Concrete Institute Dengan Perancangan Inggris Masta'in Masta'in
SIMETRIS Vol 9 No 1 (2015): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

Concrete is a construction material that is most often used, because it has many advantages both in terms of structure, economic implementation and maintenance. To determine the compressive strength of concrete using the method bias Road Note No.4, American Concrete Instiitute methods, methods of English (The British Mix Design Method) method and Try-coba.Tujuan this study was to achieve compressive strength of concrete characteristics (σ'bk = 300 kg / cm2) obtained from the method of designing the American concrete Institute (ACI) and the British design method (the British Mix Design method) by using the same material concrete apartment blocks. From research conducted in get the compressive strength of concrete produced by the method of the American Concrete Institute σ 'bk = 399.313 kg / cm2 and British methods σ' bk = 399.313 kg / cm2. The price per cubic meter of concrete with the method of the American Concrete Institute Rp. , 605 222, - and the method of British Rp. 662 759, -. Then the price per cubic meter of concrete with the method of the American Concrete Institute cheaper than the British method.
Studi Eksperimen Pengaruh Variasi Putaran Fan Kondensor Terhadap Laju Pendinginan Mesin AC Split 1 PK Danang Rianto
SIMETRIS Vol 9 No 1 (2015): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

In the condenser pipe a process of heat transfer from the refrigerant vapor to the air conditioner, the amount of heat transferred through the wall of the cooling pipe depending on the temperature difference, the pipe material, the flow rate of refrigerant and cooling fan. Condenser fan motor used as a driving force to rotate the fan to circulate cold air to cool the condenser. Therefore the condenser fan rotation greatly affect the performance of the condenser in heat transfer. In this experiment will examine how large the influence of the condenser fan rotation on the rate of cooling and the resulting COP. Experimental method is carried out by variation of the condenser fan rotation, namely: 700 rpm, 800 rpm, 900 rpm, 1000 rpm and 1100 rpm. Having done the research and analysis of data on round fan condenser 700 rpm, 800 rpm, 900 rpm, 1000 rpm and 1100 rpm, be concluded that the round fan condenser most optimal is the rotation of 900 rpm, as shown by the results of the cooling rate of the fastest and the COP compared with the variation of the condenser fan rotation others. The cooling rate generated in the condenser fan rotation rpm 900 reaches -3.6 ⁰C in the first 5 minutes and reach the steady state in the 15th minute with a temperature of 23.2 ⁰C and COP at 14.33.
Optimasi Balok Kastela Berdasarkan Atas Perbandingan Jarak Perlubangan Ngudi Hari Crista; Bambang Purnijanto; Mukti Wiwoho
SIMETRIS Vol 9 No 1 (2015): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

Kastela beam is a steel beam with the body open vertical height is doubled because the preparation of the half-pieces of the agency. Optimization of structures with variable geometry design is called a hole shape optimization, therefore, the re-calculation is required for each change of shape, so it takes a long computation time. The study aims to get the shape, size and spacing holes hexagonal shape and the distance between the holes with the same height of the perforation, in order to get the configuration or layout optimal pit, and knowing that occurs between the beam deflection Kastella with its original profile. Computerized simulation method used by SAP 2000 version 14 to 5 samples to obtain the optimum size hole distance on the I profile steel beams with hexagonal openings and the loading condition that a distributed load along the span and the load point at midspan. The simulation results show that the ratio of the smallest voltage occurs in the second sample, ie Kastella beam with a distance of 15 cm with perforations voltage value 1723.49 kg / cm2, while the ratio of the greatest stress on the sample IV Kastella beam with a distance of 25 cm with perforations voltage value 1968.21 kg / cm2. The smallest deflection occurs in sample II with a perforation spacing of 15 cm with a value of 0.2083 mm, while for the greatest deformation occurs in the sample IV with perforation spacing of 25 cm with a value of 0.2811 mm deformation, so the distance, shape, and it is best pelubangannya perforations with a distance of 15 cm for configuration or layout optimal pit. Further analysis of the cellular hole shape optimization, either circular or elliptical shape and layout of the hole, taking into account the instability I profile steel beams with cellular openings in body shape, due to bending and buckling in the web-post area.
Desain dan Implementasi Sistem informasi Wisata Goa berbasis Google Map Muhammad Sholeh; Taufik Maulana
SIMETRIS Vol 9 No 1 (2015): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

System information is information technology which is currently growing so pesat.Teknologi that can help more easily, quickly, safely and effectively clear it is helpful to anyone who use it. Including to assist the community in search of the cave. While doing caving cave information need to be visited is very important, considering the tourists who conduct tours of the cave there are some dangerous cave visited in the area. And it makes the problem of how travelers can search for suitable cave, given some constraints such as do not know the area, or do not have a friend who can show cave Goad an appropriate state for the tourists. This information system that will accommodate for tourists caves that are confused in finding the appropriate information and the cave that will help determine the state of a focused Online.sistem cave in cave information, place and circumstances of the cave can be done with this system.The success of the implementation of this system is that it can run well to help the tourists cave within a cave looking for suitable locations. By using geographic information systems make more effective web boarding and search, directions, until the state of the cave online that facilitates the process of selecting the cave to be visited.
Unjuk Kerja Turbin Uap Pembangkit Listrik Tenaga Panas Bumi Dalam Pandangan Pendidikan Islam Untung Joko Basuki
SIMETRIS Vol 9 No 1 (2015): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

Perspective of Islamic education as based on data released by the Ministry of Energy and Mineral Resources, Indonesia has an estimated geothermal potential of 27,000 MW spread across 256 locations [Suyanto]. The number of states Indonesia is an area which has reserves of geothermal energy 40% of the world's total geothermal reserves. PT PLN (Persero) PLTP Ulubelu is the largest geothermal plant in Lampung with capacity of Unit 1 and Unit 2 of 110 MW. In this research, analysis of the performance of the steam turbine mengenahi geothermal power plants and analysis of the influence of the turbine inlet temperature and pressure as well as vacuum pressure in the condenser at Ulubelu PLTP Unit 1. Based on average yield calculation analysis indicating that the actual turbine power of 49 736 kW, ideal turbine power amounting to 56617.46 kW, amounting to 48741.28 kW power generator, isentropis efficiency of 87.85%, the specific steam consumption (steam turbine rate) 6.6712591 kg / kWh, turbine heat rate 18443.66 kJ / kWh and thermal efficiency by 19 , 53%. Turbine performance is influenced by temperature, inlet pressure turbine and condenser vacuum pressure, evidenced from the results of the analysis in which the inlet temperature of 165.5 ° C 6.9543 bar inlet pressure and pressure-a vacuum condenser br 0,074-a is able to produce the actual power 50100 kW, power 55341.1516 ideal kW, ƞs = 90.5293%, the specific steam consumption of 6.44 kg / kWh, turbine heat rate 17781.03 kJ / kWh and ƞth = 20.24%.
Sistem Kendali Dan Monitoring Beban-Beban Listrik Rumah Berbasis Processing Line Comunication ( PLC ) Teguh Yuwono
SIMETRIS Vol 9 No 1 (2015): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

The use of electrical loads in the residence would be more effective and efficient if there is an automation control systems, and monitoring the set, resulting in electricity savings in all electrical and electronic equipment which affect the cost of electricity payment every month as well lifespan becomes longer. In this paper applied a method of design and manufacture of hardware systems (hadware) and software (software) by utilizing the Technology Power Line Communication (PLC). The design unit PLC based products. The design of the economic value of the product of the energy cost savings each month. Product Series P3oT PLC unit which serves as the control and monitoring of electrical loads PLC-based residential affecting the electricity cost savings of up to 37% every month. The value of benefits Benefit Cost Ratio (BCR) of 1.1 or (BCR> 1).
PEMILIHAN MODA ANGKUTAN UMUM KERETA API DAN BIS EKONOMI (RUTE : CEPU-SEMARANG ) Hartono Guntur Ristiyanto; Bambang Supranoto
SIMETRIS No 18 (2014): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

The mode choice of public transport could be the most important stage in transportation planning. Because of its key role in many transportation policies. Passenger mode choice behaviour based on the mode characteristics and level of service, as well as user characteristics. It is necessary to figure out the preference of mode choice between train and bus route of Cepu-Semarang economic class. This recearch aims to develop mode choice model and analyse sensitivity of the mode choice of public transport. The approach used in this research is stated preference technique. Independent variables are the difference value of : travel cost, travel time, and acces time between train and bus. Data analysis on model is carried out using binomial logit model, and estimation of model parameter is carried out using multiple regression analysis. Results of descriptive analysis showed that majority of respondents option is “definitely train”. It is also shown that train was given preference over bus. According to statistics test, travel cost attribute is excluded from analysis due to its colinearity. Mode choice model obtained from analysis is : Pilihan = 1,045-2,011*∆Travel Time-0,023*∆Acces Time, and probability model of mode choice is : . Based on the direct and cross elasticity, the travel time attribute has bigger elasticity value than acces time.Travel time is more sensitive than acces time in choice probability of train and bus.
ANALISIS SIMULASI PEMASANGAN FILTER HARMONISA MENGGUNAKAN ETAP 4.00 DI PLTU UNIT 1 PT. INDONESIA POWER TAMBAK LOROK SEMARANG Agus Darwanto
SIMETRIS No 18 (2014): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

Harmonisa merupakan permasalah yang tak pernah lepas dari system kelistrikan. Kenyataan di dunia industri banyak digunakan peralatan yang bersifat non linier sebagai sumber utama penghasil harmonisa. Jika dibiarkan , kadar harmonisa yang tinggi dapat merusak peralatan kelistrikan,hal ini akan menambah biaya perawatan peralatan listrik yang tentu saja akan merugikan pengguna listrik itu sendiri, baik industri maupun rumah tangga. Dalam penelitian ini dengan bantuan software ETAP 4.00 dilakukan simulasi pemasangan filter harmonisa guna mencari solusi untuk mengatasi harmonisa Simulasi dilakukan sebanyak 3 kali dengan jenis beban dan filter yang berbeda kemudian digabungkan menjadi satu, baik filter maupun beban. Dari hasil simulasi didapati terjadinya pengurangan hingga 1,9% untuk setiap filter dari total kadar harmonisa sebesar 8,45% dari Vthd dan pengurangan hingga 9.76% untuk Ithd dari total 22,92% pada system. Maka dapat disimpulkan pemasangan filter pada system tenaga listrik terutama yang terletak dekat dengan beban non-linier, dapat mengurangi kadar harmonisa.
RANCANG BANGUN SISTEM INFORMASI GEOGRAFIS DENGAN FUZZY MULTIPLE CRITERIA DECISION MAKING UNTUK PEMILIHAN LOKASI PRIORITAS UNTUK PENGEMBANGAN PERUMAHAN DAN PERMUKIMAN DI KAWASAN BLORA Joko Handoyo; Agus Darwanto; Suprawikno Suprawikno
SIMETRIS No 18 (2014): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

Housing and Settlement is one of the basic human needs in order to improve people's welfare and equity . No real problems facing aspects develops regardless of the dynamics of public life and government policy in managing existing problems . In addressing the issue of housing and settlements , each process is implemented gradually through the stages of the preparation , planning , implementation , management , maintenance , and development . The software has been created it can be used to solve decision-making to some alternative decisions to be taken with some of the criteria that will be taken into consideration by using Fuzzy Multiple Criteria Decision Making to get a decision alternative with the highest priority as an optimal alternative . The software has been created it can be used to solve the decision to seek the determination of the optimal location for residential development based on criteria SNI 03-1733-2004 . From the test results it can be concluded that by using Fuzzy Multiple Criteria Decision Making can be set on locating residential development consisting of three integral alternative location . Integral is the location of diagnosis results obtained optimal location , with a degree of optimism either 0 , 0.5 and 1

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