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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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A Pengaruh Kekerasan Benda Kerja Terhadap Getaran Bentuk Geram dan Kekasaran Permukaan pada Proses Bubut Mudjijanto Mudjijanto
SIMETRIS Vol 15 No 2 (2021): Simetris
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Kekasaran permukaan menjadi salah satu parameter dalam menentukan kualitas produk hasil proses pemesinan. Faktor-faktor yang dapat mempengaruhi tingkat kekasaran permukaan salah satunya adalah material, sementara Geram merupakan barang sisa hasil proses pemesinan, yang keberadaanya sering kita sebut sebagai sampah. Bentuk dan geometri geram sangat beragam dan hal ini bergantung pada parameter proses pemesinan, tool dan jenis material. Penggunaan material di masyarakat sangatlah beragam, tentunya sesuai kebutuhan. Beberapa material diantaranya baja karbon menengah, baja paduan dan baja perkakas, kualitas mesin baja-baja tersebut tentu akan menjadi rujukan enginner dalam menentukan kualitas saat di mesin. Karakterisasi bentuk geram dibutuhkan sebagai upaya pendekatan kontrol kualitas terhadap material pada proses cutting terutama mesin bubut. Metode penelitian ini menggunakan jenis pahat finishing. Dalam penelitian ini akan dilakukan analisis kekasaran permukaan, bentuk geram serta getaran yang ditimbulkan dari proses pemesinan bubut. Hasil eksperimen yang didapat dari penelitian ini adalah semakin meningkatnya kedalaman pemakanan (depth of cut) akan menghasilkan peningkatan getaran dan akan menghasilakan peningkatan kekasaran permukaan, semakin keras material akan menghasilkan peningkatan getaran dan akan menghasilkan meningkatkan kekasaran permukaan kecuali untuk material AISI D2 kekasaran permukaan paling tinggi hal ini di karenakan material AISI D2 dalam pengerjaan dingin mengalami regangan yang besar dan semakin besar depth of cut akan menghasilkan bentuk geram yang kontinyu dengan diameter yang semakin kecil dan semakin keras material akan menghasilkan bentuk arc chips
Analisis Performance Centrifugal Pump dengan Mengunakan Computating Fluid Dinamyc (CFD) untuk Transfer Condensate di Area Onshore Processing Facilities Balongan PHE ONWJ Mudjijanto Mudjijanto
SIMETRIS Vol 15 No 1 (2021): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v15i1.319

Abstract

Condensate transfer is one part of upstream oil and gas production operations. Condensate is a liquid hydrocarbon obtained from gas wells. Transfer is carried out using a transfer pump. In the activity of using the pump, we need to analyze the pump parameters. The aim is to evaluate the energy performance of the pump according to the variation of the velocity of the fluid being flowed and to determine the pump's working point. The research was conducted by testing the performance of the pump in the field and analyzing it using CFD in solidwork application. The method applied is to change the flow variation with a fluid velocity of 5.9m/s; 17.2m/s ; 20.5m/s. Tests are carried out to determine the pressure and temperature of the pump. The test data in the field will then be compared with the simulation data in the application. The results of the analysis carried out using a flow variation of 5.9 m/s and 17.2 m/s obtained a pressure and temperature comparison between the actual and the simulated according to the operating conditions of the pump. In the analysis with a speed variation of 20.5 m/s there is an indication of a decrease in pump pressure under actual conditions in the field, namely 39 Psi, while in the simulation with ideal conditions it exceeds the operating pressure of the pump. So the conclusion obtained is that the variation in flow causes differences in pump performance in terms of Pressure and Temperature. At a variable speed of 20.5 m/s there is a change in pump performance and if left unchecked can cause damage in the long term.
Simulasi Kavitasi Pada Venturi Dengan Menggunakan CFD (Computational Fluid Dynamics) Mudjijanto Mudjijanto
SIMETRIS Vol 16 No 1 (2022): Simetris
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v16i1.320

Abstract

In the piping installation system, the phenomenon of cavitation is often overlooked, while cavitation itself is one of the disadvantages in the piping installation system. For this reason, we conducted a study on the cavitation phenomenon in venturi using Fluent 6.3 software. The fluid pressure entering the venturi comes from pumps that are arranged singly, in series and parallel. For the pressure generated from the pump arrangement as follows single pump 5 psi, 6 psi in series and 11 psi in parallel. The first is to collect data, model on gambit, carry out the meshing process, determine the boundary conditions and run the Fluent 6.3 3D solver. From the simulation, we can see the flow pattern from the characteristics of pressure, velocity, direction, pressure trajectory, and flow velocity trajectory. Cavitation occurs at the venturi neck and turbulent flow occurs at the outlet of the venturi
Analisis Keamanan Aplikasi Dompet Digital Pendekatan Statis dan Dinamis Gunawan, Indra
SIMETRIS Vol 17 No 1 (2023): Simetris
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v17i1.321

Abstract

Android application is an application or software that combines certain features in a way that is accessible to the user. The purpose of this study is to determine the level of security of the digital wallet application DANA, OVO , Go Pay, Link aja dan Shopee PAY. This digital forensic analysis uses 2 methods, namely static by using MOBSF as a network performance activity recorder application and dynamic by using Network Miner as an application to collect data about traffic on the network. The results of the research using the static method show that the five applications have dangerous permissions, while using the dynamic method shows evidence of data leakage in the digital wallet application.
ANALISIS PERBANDINGAN KUAT TEKAN, DAYA SERAP AIR DAN DENSITAS BATU BATA MERAH Cepu, Sulistia
SIMETRIS Vol 17 No 1 (2023): Simetris
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v17i1.322

Abstract

Brick is a building component made of soil, bricks are usually used for house walls, fences, and foundations. Brick serves as a load support or component bearer above it and can also be used as a dividing wall. Many bricks are chosen as an alternative to the main building blocks because bricks are easy to find, the price is relatively cheap, weather resistant and has a high enough strength. Good quality bricks are not easy to crack, have no lumps and have a uniform size. The method used is to test the compressive strength, density and water absorption of bricks on the market. The results of testing the compressive strength of red bricks from the village of Kalangan, Padangan District have an average of 8.16 kg/cm2 with a density of 1.754 grams/cm3 and an absorption capacity of 4.71%. The average compressive strength of red bricks from Mojorembun village is 8.52 kg/cm2 with a density of 1.720 grams/cm3 and water absorption capacity of 15.09%. The compressive strength of red bricks from Jatirogo averages 8.80 kg/cm2 with a density of 1.727 grams/cm3 and water absorption capacity of 6.81%
Rancang Bangun Pengontrol Beban Listrik Menggunakan Perintah Suara Melalui Smartphone Android Berbasis Arduino Nano Wibowo, Lastoni; Putro, Dwi Purnomo
SIMETRIS Vol 17 No 1 (2023): Simetris
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v17i1.323

Abstract

Electrical Loads are electrical equipment that is attached to the electrical system in a house or building. The operation of electrical equipment generally still uses a mechanical switch. The use of mechanical switches is considered less effective because controlling electrical equipment must be done directly through the switch. In this research, a prototype controller of an electric load was designed and built through voice commands given via an Android smartphone. The prototype made is based on the Arduino nano microcontroller. The prototype made is capable of controlling 10 electrical loads with a load capacity of 200 Watt each. The trials that have been carried out show that the prototype is able to execute voice commands with a success rate of 91%.
Analisa Aliran Fluida pada Gas-Solid V Shaped Fluidized bed Reaktor dengan Computational Fluid Dynamics (CFD) Sulistiyo, Raka Mahendra
SIMETRIS Vol 17 No 1 (2023): Simetris
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v17i1.324

Abstract

The use of gasification to deal with waste problems is an important issue of environmental conservation. One of the important components in the gasification system is the reactor design and one commonly used is the fluidized bed reactor. The use of a fluidized bed reactor requires solid particles in the form of powder. The V-shaped reactor design was used with laboratory scale sizes with variations in particle diameter, 0.3 mm, and 0.4 mm. Variations in the inlet gas velocity are 0.2 m/s, 0.3 m/s, 0.8 m/s. Computational Fluid Dynamic (CFD) simulation method in 2 dimensions is used to analyze the existing variables. With these variations, a fluid bed condition has occurred. Produced with a larger particle diameter tends to produce smaller bubbles. The inlet gas velocity of 0.2 m/s produces bigger bubbles than 0.3 m/s, while 0.8 m/s does not produce bubbles.
Analisis Lokasi Rawan dan Biaya Kecelakaan Ruas Jalan Bojonegoro-Ngawi KM.33-KM.63 Ristiyanto, Hartono Guntur
SIMETRIS Vol 17 No 1 (2023): Simetris
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v17i1.325

Abstract

The Bojonegoro-Ngawi highway KM.33-KM.63 is part of the national road that connects the provinces of East Java and Central Java. One of the strategic roles of this road segment is that it is the closest access to the Trans Java toll road Solo-Kertosono section. Accidents on these roads have the potential to result in a decrease in the performance of these roads, namely in the aspect of road user safety. Therefore, it is necessary to conduct a study of accident-prone areas on this road section. Accident data available at the time the research was conducted was still in the form of tabulation of raw accident data. Information regarding accident-prone locations and costs is not yet available. This information is needed in an effort to improve traffic safety for the prevention and handling of accidents. Based on the background of the problem, the formulation of the research problem is: where are the accident-prone locations and what are the costs incurred? Analysis of accident-prone locations uses the Equivalent Accident Number (EAN) and Upper Control Limit (UCL) methods and the accident cost analysis method uses the Gross Output method. The results of the analysis of accident-prone locations show that there are 12 segments whose AEK values ​​are above the limit value or UCL. The biggest loss in an accident is caused by the death toll. While the largest accident classification costs occur in fatal accidents. Meanwhile, the analysis of accident costs per road segment based on the type of accident victim shows that the top 3 segments with the highest accident costs are identical to the results of the analysis of AEK and UCL values. The limitation of this research is that it has not considered qualitative losses. This method does not include compensation for pain, fear, grief or suffering. Therefore, for further research it is necessary to carry out a more comprehensive analysis regarding the types of material and non-material losses
Transformasi Laplace Secara Numerik Menggunakan Interpolasi Hermite dan Spline Prasetiyo, Ari Puji
SIMETRIS Vol 17 No 1 (2023): Simetris
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v17i1.329

Abstract

Laplace transform is a from of integral transform which has many applications in numerous fields. This transform converts a function of a real variable to a function of a complex variable. Function can be found by evaluating the given integral of transform’s definition. In some cases, evaluation of integral of can be too complicated to perform analytically. Then numerical integration is a way out to solve the problems. This paper introduces a simple numerical method of Laplace transform employing composite Simpson rule. Numerical integrations are performed at to construct sequence as approximation of . Hermite and spline interpolation is the applied to in order to produce as the numerical Laplace transform of . The accuracy of the proposed method is revealed by calculating the distance between and using norm. As the results, function can provide a decent approximation of for some test functions. In general, Hermite interpolation produces which is closer to compared to the result obtained by spline interpolation.
Pengaruh Penambahan abu ampas tebu Terhadap kuat tekan batako Andi, Andi Rahmanto Rahmanto
SIMETRIS Vol 17 No 1 (2023): Simetris
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v17i1.330

Abstract

Limbah abu ampas tebu dapat dimanfaatkan sebagai subtitusi semen dalam penelitian ini dipergunakan pada bahan konstruksi yaitu batako, maka pemanfaatan abu ampas tebu sebagai campuran semen dalam pembuatan batako dapat diapakai bahkan mendapat massa yang lebih ringan dari batako tanpa penambahan abu ampas tebu. Penelitian ini dilakukan dengan perbandingan bahan campuran batako, yaitu pasir : semen : air adalah 3,75 : 1 : 0,25. Abu ampas tebu dicampur dengan variasi : 10%, 20%, 30%, menggantikan sebagian fungsi semen (pengikat) dengan mengurangi massa semen sebesar massa abu ampas tebu tersebut dan sebagai pembanding dibuat campuran dengan kadar abu ampas tebu 0%. Hasil penelitian menunjukkan batako tanpa penggunaan abu ampas tebu memiliki densitas 1,759gr/cm3, penyerapan air 10,224%, kuat tekan 83,16kg/cm2, hasil pengujian pada batako 10% abu ampas tebu menghasilkan densitas 1,762gr/cm3, penyerapan air 10,442%, kuat tekan 88,27kg/cm2, hasil pengujian pada batako 20% abu ampas tebu menghasilkan densitas 1,813gr/cm3, penyerapan air 9,226%, kuat tekan 71,94kg/cm2,dan hasil pengujian batako 30% abu ampas tebu menghasilkan densitas 1,751gr/cm3, penyerapan air 8,707%, kuat tekan 53,57 kg/cm2.Kata Kunci :Pembuatan Batako Dengan Campuran Abu Ampas Tebu

Page 12 of 15 | Total Record : 148

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