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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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Studi Hasil Coating Ni-Al-Fe dari Kombinasi Nickel Electroplating dan Hot Dipping (Galvanizing) pada AISI 1020 Dikky Antonius
SIMETRIS Vol 13 No 2 (2019): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

Usually, coating formed to obtain a protective layer which would prevent the base material contacting the air. However, currently many coating formed not only to protect the base material, but to enhance the characterization. Nickel electroplating followed by galvanizing using molten aluminum held in this experiment to obtain the Ni-Al phase to enhance the mechanical behavior of the samples. Sample was dipped into the electrolyte consist of NiSO4, NiCl2, and H3BO3 with concentration 250gr/l, 50gr/l, and 30gr/l respectively. All of them was electroplated in 20 minutes. Galvanizing with molten aluminum at 700oC was with varied in 10s, 20s and 30seconds process. The coating clearly shows 5 segment layer above the base metal: Nickel Layer, 2 layer of NiAl3, Ni-Al layer and Aluminum layer. The longer experiment sustained, the thinner nickel coating found. However, the Ni-Al phase which contributed to 1st,2nd and 3rd layer does not make any difference thickness. Moreover, there are many worm-structure Ni-Al found in the aluminum coating, showing that nickel was likely diffused in to the aluminum instead of the ferrous
Pengaruh Debit Fluida Air terhadap Distribusi Diameter Bubble pada Microbubble Generator Tipe Orifice-Porous Tube Drajat Indah Mawarni; Agus Dwi Korawan
SIMETRIS Vol 13 No 2 (2019): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

Microbubble generator merupakan alat yang dapat menghasilkan gelembung atau bubble berukuran mikro. Penelitian ini mempelajari pengaruh aliran swirl yang diciptakan oleh cyclone pada microbubble generator tipe orifice 12 mm dengan menggunakan porous tube dari stainless steel wire mesh ukuran 300 terhadap distribusi diameter bubble yang dihasilkan. Penelitian ini menggunakan Microbubble generator tipe orifice karena memiliki bentuk yang sederhana dan proses manufaktur yang mudah. Untuk meninjau performa dari microbubble generator dapat digunakan beberapa parameter yaitu, hydraulic power (Lw), pressure drop, dan distribusi diameter bubble yang terbentuk. Pada penelitian ini, performa atau karakteristik microbubble generator dipelajari dengan melakukan penelitian pengaruh perubahan debit air (Q­L) terhadap distribusi bubble yang dihasilkan.Debit aliran yang digunakan mempunyai rentang antara 30 lpm – 60 lpm serta distribusi diameter bubble yang dihasilkan diakuisisi dengan menggunakan high speed camera. Berdasarkan hasil penelitian menghasilkan bubble dengan probabilitas tertinggi pada rentang diameter 300 – 450 µm.
Unjuk Kerja Model Turbin Angin Poros Horizontal Dengan Variasi Bentuk Blade sarjono sarjono
SIMETRIS Vol 13 No 2 (2019): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

The purpose of this research is to find out the Horizontal shaft wind turbine Model work with Blade shape variations. In this research the variation is done on the blade shape. The Blade is designed with curved shape, inverted linear taper and rectangular with size 8 cm x 20 cm at 20o tilt angle with wind speed 7; 8; 9; 10; and 11 m/s. The results showed that variations in the blade shape affected the horizontal shaft wind turbine work. Brake Horse Power (BHP) is maximally obtained with a rectangular shape blade of 1, 1 watt at a wind speed of 11 m/s with a torque of 0.0221 Nm on the blade shape and the same wind speed. While the high efficiency is achieved with a rectangular shape blade at a wind speed of 7 m/s by 21%.
Pengaruh Variasitekanan Pengepresan Terhadap Karakteristik Pembakaran Briket Arang Daun Jati (Tectona Grandis L.F) sarjono sarjono
SIMETRIS Vol 13 No 1 (2019): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

The potential of biomass teak leaves as an alternative source of energy is so abundant, but not yet fully realized. Teak leaf is one type of biomass that can be used as an alternative fuel. The objective of this research is to determine the influence of pressure variation on the combustion characteristics of teak biobriket charcoal. Testing carried out with a variation of pressing pressure of 350 psi, 600 psi, 850 psi, 1100 psi and 1350 psi.The test results of the influence of pressure variations on the presses against the combustion characteristics of teak charcoal briquettes show that biobriket with lower dipbriglutinous pressure has the highest combustion rate of 0.0928 grams/second. The combustion temperature rate reaches 486.4 ° C and the lowest temperature is 384.3 °c. Mass reduction will be quicker if the temperature of the air flowing into the fuel chamber is higher. The decrease in mass will be faster if airflow speed is raised. Low glutinous pressure causes the fuel to be shorter in its burning time.
Studi Numerik Gerakan Mainan Mekanik Monobike Eva Hertnacahyani Herraprastanti; Hendri Suryanto .; Suluh Jatmiko .
SIMETRIS Vol 13 No 2 (2019): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

In today's development where there are several applications to design a product, where in the design of a product, not only can physically design the components, but also can design the desired movements. In order to produce product movements as desired, when designing it must first choose the right mechanism and perform synthesis and analysis of kinematics. To make a toy move, the components which make up the toy are needed by following a certain mechanism. In this study the mechanical toy that will be analyzed for its movements is Monobike. In the monobike there is a Slider Crank mechanism that results from the paddling of the foot which rotates the pedal and moves up and down. The up and down pedal will turn the second wheel and cause the body of the doll holding the fan to move up and down. The research objective is to numerically analyze component movements in Monobike mechanical toys which include linear displacement, velocity and acceleration analysis. In this research, a monobike mechanical toy that mimics human activities in pedaling a bicycle is determined. The methodology in this research is as follows: a) make a kinematic diagram, b) determine the position vector of each link, c) derive the equation, d) make the GNU Octave code. Based on the results of the study concluded that a numerical study with the GNU Octave can be done to analyze the kinematic motion of a machine. Linear displacement on link 3 has the furthest displacement of 18.38 mm, and one cycle of movement requires 120 seconds. The maximum linear speed of the Monobike mechanical toy is 36.2 mm / sec. While the maximum linear acceleration of a monobike mechanical toy is 172.3 mm / sec. GNU Octave is a freeware application that is no less reliable than the Matlab application in analyzing the kinematics of a machine.
Evolusi Peleburan Paraffin Sebagai Material Penyimpan Kalor (Studi Kasus Pada Model Tube-and-shell Versus Model Cone-and-shell) Agus Dwi Korawan
SIMETRIS Vol 13 No 2 (2019): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

Paraffin as a heat storage material has many advantages, including good thermal properties, safe to use because it is not easy to react, and inexpensive. In this study, the paraffin was applied to the tube-and-shell and cone-and-shell type heat storage. The observed process is the paraffin melting process, which is done by taking pictures with digital cameras in both types during the melting process, taking pictures every 45 minutes from the beginning until the completion of the melting process. The results show that the paraffin melting in the tube-and-shell model occurs first, but the paraffin smelting is finished faster in the con-and-shell model.
PENGEMBANGAN SISTEM INFORMASI APOTEK MENGGUNAKAN JAVA NETBEANS IDE DAN DB MYSQL Galuh Kumala Dewi Setioko; Muksan SAN Junaidi
SIMETRIS Vol 14 No 1 (2020): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

Recording of drug sales and purchase transactions is a process carried out at the Lillis pharmacy. Currently the transaction process is done manually or still using books that can cause difficulty in knowing the amount of drug stock, the slow recording of transactions, the difficulty of finding expired drug data, the drug return process has difficulty in finding so many transaction notes, bad possibilities that can occur is if the memorandum is lost before the transaction data is entered into the report book, the slowness of making sales and purchasing reports. The purpose of the research is the design, development and application of the drug distribution process using a Java-based NetBeans IDE information system. The design of the information system is modeled into diagrams in UML (Unified Modeling Language) and the method of developing the System Development Life Cycle (SDLC) with the Waterfall model. The test results of the Pharmacy Information System obtained 99% of the interfaces tested properly. The research data was taken from Lillis Pharmacy in 2019. This research is expected to be able to help Lillis Pharmacy to simplify and speed up the processing of drug sales and purchase data optimally.
Analisis Potensi Daya Mekanis Yang Dihasilkan Konverter Energi Metode Bandul Vertikal Di Air Tenang Hendri Suryanto; Drajat Indah Mawarni
SIMETRIS Vol 13 No 2 (2019): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

Hydroelectric power plants have been widely developed. One that is mostly built especially in mountainous or highland areas is power plants that use falling water energy or river water currents to turn turbines connected to generators. In coastal areas today power plants have been developed using abundant sea waves known as the Wave Energy Converter (WEC), with one of the methods used is the pendulum method. For areas in the lowlands and far from the coast but there are bodies of water such as lakes, swamps and rivers with slow flow, which are large enough, the potential of the water has not been used to drive electricity generation and the question arises whether it can be utilized to drive the converter. For this reason, it is necessary to research the use of calm water to drive the converter. By adopting the WEC technology used in ocean waves, the vertical pendulum method above the pontoon was chosen in this study, which according to the author's consideration is simpler than the other methods. The design of the converter made was a vertical pendulum mounted on a flat pontoon by adding components in the form of a barrier pair to make water surging continuously under the pontoon so that the pendulum swings continuously. In this study the observed variable was the power produced by the converter by varying the arm length from 0.2 to 0.3 m with a pendulum load varying from 0.5 to 1 kg. Theoretical analysis showed the results of greater mechanical power produced by using a larger pendulum mass. And the faster rotation of the pendulum shaft was produced by using the shorter pendulum arm.
MODIFIKASI HIBRID SEBAGAI UPAYA MENOPANG KEMANDIRIAN ENERGI LISTRIK SKALA RUMAH TANGGA Teguh Yuwono; Ari Prasetiyo; Irfan Ansori
SIMETRIS Vol 14 No 1 (2020): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

Ministry of Energy and Mineral Resources (ESDM) states that Indonesia's electricity consumption in 2017 reached 1,012 kWh per capita, up 5.9 percent from the previous year. Utilization of potential mechanical energy sources for electric water pumps as part of the need for household electrical equipment has the opportunity to be developed into a hybrid source through the mechanism of conversion of mechanical energy into electricity through direct current (DC) mini generators. Mini DC generator is a modified component unit which converts mechanical energy into DC electrical energy which is connected to the shaft where the electric motor fan pumps water. When an electric water pump is used in daily use in the household, mechanical energy that arises in the electric motor is used to produce dc electrical energy through a mini generator that is coupled to the water pump motor. DC electrical energy from the conversion of the mini generator will be supplied to the mini generator unit as a tool that functions to change the dc to dc or dc to ac voltage which is practical for the purposes of electricity backup or as an alternative source of additional household-scale energy with a hybrid source. The mini generator set unit is equipped with an Auto Transfer Unit (ATS) unit and a charger cut-off battery charger unit. The working principle of ATS uses relay components, which is when the main power source experiences blackouts or interference, then the ATS unit will automatically divert the main electrical energy supply to an additional electrical energy source or hybrid source. This research produced a hybrid system modification method to sustain electrical energy of 17.2 kWh and a cost savings of Rp. 10,398 every month, the application was in the form of a prototype product supporting a mini generator capacity of 500 watts pure sine wave (PSW) with an energy source from modification of a hybrid mini generator.
Analisis Dampak Infrastruktur Terhadap Pertumbuhan Ekonomi di Kabupaten Blora Hartono Guntur Ristiyanto
SIMETRIS Vol 14 No 1 (2020): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

Infrastruktur perekonomian dibutuhkan untuk meningkatkan produktivitas, memperlancar proses distribusi barang dan jasa serta meningkatkan efektivitas dan efisiensi operasional dunia usaha. Infrastruktur perekomian juga mempunyai peranan yang sangat penting dalam menggairahkan iklim dan perkembangan investasi di daerah. Untuk itulah pemerintah daerah perlu memberikan perhatian dalam penyediaan infrastruktur di daerahnya, agar perekonomian daerah dapat bertumbuh dan berkembang dengan baik. Keterkaitan antara infrastruktur dengan pertumbuhan ekonomi masyarakat perlu diketahui bagi stakeholder terkait untuk kepentingan evaluasi dan pembangunan infrastruktur sejak dari penyusunan anggaran, perencanaan, pelaksanaan, dan perawatan infrastruktur. Sehingga diharapkan pembangunan infrastruktur akan tepat sasaran dan mampu memberikan kapasitas layanan yang sesuai dengan potensi daerah yang akhirnya bermuara kepada peningkatan pertumbuhan ekonomi masyarakat. Oleh karena itu, penelitian tentang keterkaitan infrastruktur dan pertumbuhan ekonomi perlu dilakukan. Penelitian bertujuan menganalisis keterkaitan hubungan antara infrastruktur dengan Produk Domestik Regional Bruto (PDRB). Variabel dependen dalam penelitian ini adalah PDRB Atas Dasar Harga Konstan (ADHK). Sedangkan variabel independen adalah : luas lahan teririgasi, panjang jalan dan jembatan, daya listrik tersambung, dan jumlah air bersih tersalur. Metode untuk menganalisis keterkaitan infrastruktur dengan PDRB Kabupaten Blora adalah dengan analisis data time series dan analisis data panel, yaitu data gabungan time series dan cross section. Hasil analisis menunjukkan infrastruktur jalan kabupaten merupakan infrastruktur yang paling signifikan menjelaskan hubungan peningkatan PDRB dengan jenis infrastruktur di Kabupaten Blora, dengan bentuk persamaan matematika : PDRB = 3,368 + 0,013*PANJANG JALAN KABUPATEN. Interpretasi persamaan model di atas adalah : setiap pertambahan panjang jalan kabupaten sebesar 1 km, maka akan menaikkan PDRB sebesar 0,013%.

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