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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 8 Documents
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Search results for , issue "Vol 13 No 2 (2019): SIMETRIS" : 8 Documents clear
Proses Milling CNC Sinumeric 808D pada Material Acrylic untuk Mendapatkan Kualitas Permukaan yang Optimum dengan Menggunakan Parameter Tebal Pemakanan, Voeding dan Kecepatan Potong Harun Satria; Joko Waluyo
SIMETRIS Vol 13 No 2 (2019): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

The value of a product can be indicated by one of them is surface quality. The machining process has different fineness (roughness value), especially in CNC Milling machines. This study aims to determine the variability of tool path, Spindle Speed, and Feed Rate on flat surfaces machined CNC Milliing Sinumerik 808D 3 Axis on Acrylic material, on the surface roughness produced in units (Ra) which results are good. The machining process of acrylic materials using CNC Milling machines is carried out at the Campus CNC Laboratory of the Akprind Institute of Science & Technology in Yogyakarta. Surface roughness testing was carried out at the Engineering Materials Laboratory, Department of Mechanical Engineering, Gadjah Mada University using the Surface SE 1700 roughness test equipment and material surfaces observed using a 200x magnification metal microscope. The machine parameters that are set are the spindle speed of 1000, 1500, 2000 rpm, Feed Rate 400, 800 mm / min and use the zigzag & one way tool path. The conclusion obtained is that at 1000 rpm spindle rotation, one way feed flow, 800 mm / minute feeding speed gets the highest roughness of 15.78 μm. While the spindle rotation of 2000 rpm feeding speed of 400 mm / min, and zig-zag tool flow get the lowest roughness value, the roughness value obtained is 7.074 μm. Then the CNC Milling Machining Process on Acrylic material if you want to have good roughness the parameters must be high rotating speed and low Feedrate using a one way toolpad.
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%.
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.
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.
Aplikasi Metode Aktivasi Secara Kimia Pada Zeolit Alam Sebagai Penjerap Logam dalam Proses Pemurnian Air Puput Eka Suryani
SIMETRIS Vol 13 No 2 (2019): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v13i2.201

Abstract

Population growth that continues to increase every year has an effect on the increasing need for clean water to meet daily life. The availability of water sources that continue to run out due to being displaced by the human population every year needs serious attention. This is because the need for water covers almost all sectors of human life such as industry, tourism, agriculture, households, etc. Basically water quality can be influenced by several things such as environmental pollution, mineral content in water, and the presence of dissolved metals due to the distribution process. An increase in population is followed by an increase in some human activities that can cause water pollution. The high level of environmental pollution due to industrial waste results in a decrease in the quality of the springs. Indonesia is one of the countries that has abundant natural zeolite sources. The use of zeolites can be optimized as a solution in cases of water pollution or water quality improvement. In this research, we will study further about the ability of chemically activated natural zeolite to adsorb heavy metals in water. The sample water used in this study was taken from groundwater in the Cepu area which is predicted to have a high level of hardness. Natural zeolite was activated by acid using 2 M HCl solution. The structure of zeolite was analyzed using X-Ray Difraction (XRD), while the adsorption ability was analyzed using Atomic Absorption Spectroscopy (AAS). The results showed that the main mineral constituent of the natural zeolite used was modernite. Chemical activation is able to increase the active site in natural zeolite, it can be seen from the appearance of higher peaks in the modified zeolite.

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