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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 176 Documents
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Otomatisasi Pengisian Runner Plastik Polyethylene dengan Autoloader Conveyor Kumbarasari, Shanti; Rahadiansyah, Rinji; Omachi, Moric
SIMETRIS Vol 18 No 1 (2024): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v18i1.419

Abstract

Pada proses produksi plastik polyethylene (PE) dengan cetakan dua plate, dihasilkan runner (bagian plastik yang tidak digunakan) yang perlu didaur ulang. Selama ini pemindahan runner polyethylene ke mesin granulator untuk dicacah dan didaur ulang dilakukan secara manual, yang beresiko menyebabkan kelelahan dan cedera bagi operator. Maka diperlukan pemasangan material handling autoloader conveyor untuk memindahkan runner polyethylene secara otomatis dengan spesifikasi yaitu dimensi bak penampungan runner 1150 x 987 x 924 mm3, dimensi konveyor: 1150 x 2021 x 2254 mm3, kemiringan konveyor 45°, jenis belt conveyor adalah flat belt plastik dengan panjang belt 2,5 meter berdiameter 164 mm. Sumber penggerak: motor AC 1,5 HP, 1,1 kW, 4 pole, 1390 rpm with MCB: 6 Ampere. Untuk part automatisasi menggunakan sensor proximity yang berfungsi alat pendeteksi perubahan jarak terhadap pada suatu benda tanpa adanya kontak fisik. Penggunaan autonics proximity sensor AC 2 Wire PR 12-4AC untuk mengidentifikasi posisi hoper dalam posisi kosong atau penuh terisi material .Pemasangan material handling autoloader conveyor merupakan salah satu solusi untuk mengatasi permasalahan pemindahan runner polyethyene secara manual, sehingga dapat meningkatkan optimalitas proses daur ulang, keamanan, dan kesehatan pekerja di pabrik.
Pengujian Metode Ekstrapolasi Richardson Untuk Meningkatkan Akurasi Turunan Numerik Prasetiyo, Ari Puji
SIMETRIS Vol 18 No 1 (2024): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v18i1.422

Abstract

Metode ekstrapolasi Richardson, yang dinisbahkan kepada matematikawan Inggis Lewis Fry Richardson (1881-1953), adalah suatu metode akselerasi berurutan untuk meningkatkan kecepatan konvergensi barisan nilai pendekatan dari suatu konstanta. Jika suatu formula pendekatan N1(h) berlaku untuk semua ukuran langkah h>0 maka dapat disusun suatu formula pendekatan baru N2(h) yang memiliki galat pemotongan lebih baik dari galat pemotongan N1(h). Dari formula N2(h) selanjutnya dapat disusun formula N3(h) dengan galat pemotongan yang lebih baik dan seterusnya. Penyusunan formula pendekatan baru ini dilakukan dengan mengasumsikan bahwa galat pemotongan N1(h) mengikuti bentuk tertentu. Pada artikel ini dibahas pengujian peningkatan akurasi perhitungan turunan fungsi secara numerik menggunakan metode ekstrapolasi Richardson. Tiga formula turunan numerik yang diuji adalah formula maju, formula mundur, dan formula tengah. Dua formula pertama memiliki galat pemotongan O(h) sedangkan formula terakhir memiliki galat pemotongan O(h^2). Dari lima buah fungsi pengujian yang digunakan diperoleh hasil bahwa metode ekstrapolasi Richardson mampu meningkatkan akurasi pendekatan dari ketiga formula. Hasil terbaik diperoleh pada formula tengah terkait galat pemotongan yang hanya memuat pangkat genap.
Pengujian Bending & Struktur Mikro Sambungan Temu Bahan AISI 1010 dgn Variasi Arus pd Pengelasan SMAW Sutarto, Eko
SIMETRIS Vol 18 No 2 (2024): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v18i2.453

Abstract

Tujuan penelitian ini untuk mengetahui kekuatan lentur pada bahan AISI 1010 yang memenuhi kriteria penerimaan ASME BPVC. IX QW-163 hasil uji tekuk metoda face bend test, mengamati kemungkinan terjadinya keretakan pada sisi tarik permukaan benda uji dengan metoda dye penetrant test dan kemungkinan adanya perubahan struktur mikro pada sambungan temu pada pengelasan busur listrik dengan arus 70, 80, dan 90 A dengan menggunakan elektroda E6013 diameter 2,6 mm. Dari hasil pengujian tekuk diperoleh data rata-rata tegangan lentur las dengan arus 70, 80, dan 90A masing-masing adalah 973,67, 986,3, dan 1.049,46 Mpa, sedang dari hasil pengamatan tidak terdapat keretakan pada permukaan tarik benda uji, dan dari perbandingan foto mikro sebelum dan setelah pengelasan tidak ada perubahan struktur mikro yang berarti.
PENGGUNAAN TEKNIK DIGITAL IMAGE PROCESSING DALAM MENENTUKAN UKURAN DIAMETER GELEMBUNG BERUKURAN MIKRO Mawarni, Drajat Indah
SIMETRIS Vol 18 No 2 (2024): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v18i2.475

Abstract

Penelitian ini mengkaji penggunaan teknik Digital Image Processing (Pemrosesan Citra Digital) untuk mengukur dan menganalisis distribusi diameter gelembung mikro pada Microbubble Generator tipe aliran swirl dengan variasi debit air (QL) dan debit udara (QG). Teknik pemrosesan citra digital dipilih karena dapat melakukan pengukuran secara otomatis, cepat, dan konsisten, dibandingkan metode konvensional yang sering kali lambat dan kurang akurat. Penelitian ini menggunakan MATLAB R2021a dengan Image Processing Toolbox untuk memproses video rekaman dari kamera Canon 1200D, yang dikonversi dan diekstraksi menjadi gambar dengan format TIF. Penelitian ini memfokuskan pada distribusi gelembung dalam kondisi debit air sebesar 24 lpm, 32 lpm, dan 40 lpm serta variasi debit udara dari 0,1 hingga 0,8 lpm. Hasil analisis menunjukkan bahwa pada debit air rendah (24 lpm), ukuran gelembung cenderung lebih kecil dan lebih terpusat, sedangkan pada debit air lebih tinggi (32 lpm dan 40 lpm), distribusi ukuran gelembung lebih merata dan bervariasi. Hasil akhir dari ekstraksi data image processing ini adalah distribusi diameter microgelembung yang dinyatakan dalam Probability Distribution Function (PDF) dan digunakan untuk mempresentasikan perbandingan disribusi dimensi gelembung udara yang dihasilkan oleh MBG. Tantangan yang dihadapi dalam penelitian ini meliputi validasi pada QG tinggi, di mana terdapat penyimpangan dalam hasil distribusi yang diakibatkan oleh kualitas pencitraan atau gangguan fisik.
Evaluasi Kerusakan Jalan dan Drainase Jalan (Studi Kasus : Ruas Jalan Sorogo – Gajahmada – Hayamwuruk, Kecamatan Cepu, Kabupaten Blora) Ristiyanto, Hartono Guntur
SIMETRIS Vol 18 No 2 (2024): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v18i2.479

Abstract

One of the causes of road damage is the presence of excess water due to inadequate drainage systems. Initial information related to the condition of existing drainage and also the damage to existing roads and the relationship between the two is needed for maintenance, evaluation, planning, and construction of both infrastructures so that the priority scale of handling can be applied for budget efficiency and effectiveness. Based on the problems above, this study was conducted with the aim of evaluating the condition of the road and its drainage. Data collection was carried out using survey and field observation methods. Analysis of pavement conditions using the Pavement Condition Index (PCI) method. Analysis of drainage conditions using a qualitative descriptive method with drainage performance benchmarks based on the Bina Marga Road Surface Drainage Design Guidelines (1990). The road sections that were the objects of the study were: Jalan Sorogo, Jalan Gajahmada, and Jalan Hayamwuruk in Cepu District. The characteristics of the road surface drainage surveyed were: road transverse slope, side channel dimensions, and channel sedimentation. The results of the analysis showed that the average road condition at the time of the study had a moderate level of damage with a PCI value of 46 while the drainage had a moderate level of damage both functionally and structurally. The drainage conditions that most affect the road are channel dimensions that are not in accordance with standards and changes in function from open to closed channels. While the most dominant effects of surface drainage conditions are: puddles and water infiltration. With the most dominant types of road damage due to puddles and infiltration are: crocodile skin cracks, peeling of the surface layer, and holes
Implementasi Metode Forward Chaining pada Sistem Pakar Diagnosis Penyakit Tanaman Tembakau Auliya, Ahmad Himam; Rahmasari, Nagita; Widyassari, Adhika Pramita
SIMETRIS Vol 18 No 2 (2024): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v18i2.489

Abstract

Tobacco plants have high economic value, but their productivity is often threatened by various diseases that can harm farmers. Lack of knowledge in diagnosing diseases accurately and limited access to agricultural experts are major obstacles in controlling diseases. To overcome this problem, an expert system based on the forward chaining method was developed that is able to diagnose tobacco plant diseases based on observed symptoms. This system matches symptoms with rules in the knowledge base to produce an accurate diagnosis. The test results showed that the system had 100% accuracy on the five tobacco plant data sets tested. This success shows the potential of expert systems as an effective tool to increase tobacco plant productivity and facilitate decision making in the field.
Analisis Kerusakan Dini Transformator Distribusi Ulp Padangan Penyulang Watu Jago Menggunakan Metode Reliability, Availability, Maintainability (RAM) Suprawikno, Suprawikno; Adiaksa, Irgianto Candra
SIMETRIS Vol 18 No 2 (2024): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v18i2.492

Abstract

Electricity distribution transformers have an important role in converting high voltage into low voltage suitable for consumers. These transformers operate continuously for 24 hours in the distribution of electricity. Especially when distributing extra high voltage, supervision is required to maintain safety and performance. The Reliability, Availability, Maintainability (RAM) method is used to analyze the effectiveness and potential damage to the transformer. The analysis results show that in January, the Mean Time Between Failures (MTBF) was 372 hours with 2 failures, while in June only 1 failure. Mean Time To Repair (MTTR) in January 1.03 hours with 2 repairs, while in June only 1 repair with 0.8 hours. Failure Rate January 0.269%, June 0.139%. Transformer reliability over the last 6 months is 99.94% and will decrease. Availability in the last 6 months is 99.94%, but will decrease. Maintainability tends to be lower and will decrease further. The analysis recommends replacing the transformer in the next 1,77 years as the ease of repair is decreasing. Although generally used for 5-10 years, the level of ease of repair affects the effective use in electricity distribution.
EVALUASI TINGKAT KERUSAKAN JALAN DAN PENANGANAN PERBAIKAN RUAS JALAN DENGAN METODE BINA MARGA (Studi Kasus : Jalan Raya Halmahera Daerah Desa Jetis Kecamatan Blora Kabupaten Blora) Rahmanto, Andi Rahmanto
SIMETRIS Vol 18 No 2 (2024): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v18i2.493

Abstract

Jl.Raya Halmahera Daerah Desa Jetis Kecamatan Blora Kabupaten Blora is one of the national roads accesses between cities. leading to the many country.This road plays an important role in promoting economic growth, because this road is also access.The purpose of this study was to determine the type of damage and the level of road damage and provide alternative road damage repairs. A research site on the 1 km long , has one lanes and 4 m wide, type of flexural damage ( asphalt ), this study uses the methot of Bina Marga.There are 5 types of damage : Perforated ( 71,6963 m² ), Sink ( 88,794 m² ), Item Release ( 69,63193 m² ), Crack ( 68,901² ), Plot (102,4885 m² ). Total damage of 401,51 m² or 10,04 % of the total area of 4000 m². The most dominant damage is the type of damage item release 25,53%, patch 22,11% and disappear 17,86% of the total area of damage, causing inconvenience for motorists using the road, this occurs due to the development that occurs from other types of damage that are not immediately handled, the influence of weather ( especially rain ) which accelerates the formation of holes, and minor damage that occurs.Repair damage can be done by repairing according to the damage that occurred, appropriate improvement is ( patching ), and repainted ( overlay ) and further routine maintenance is carried out
Peningkatan Kompetensi Berkomunikasi Ilmiah Dengan Laboratorium Berbantuan Komputer Rahayu, Ratna Dwi
SIMETRIS Vol 18 No 2 (2024): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v18i2.494

Abstract

In learning physics, one of the competencies that must be mastered in the competence of scientific work is the competence of scientific communication. Scientific communication can be done orally or in writing. The purpose of this research is to describe the science process skills that can be developed in guided inquiry-oriented laboratory activities and develop inquiry-oriented devices in the form of student laboratory activity sheets that can encourage student competence in scientific communication. The achievement of scientific communication competence is done by doing hands on laboratory activities and multimedia laboratories with guided inquiry insights by developing student laboratory activity sheet devices. The research method used is research and development (R&D) method. To measure the achievement of indicators used tools in the form of: evaluation (pre-test and post-test), laboratory activity sheets, laboratory activity reports, practicum observation sheets and discussions. The results of this study indicate an increase in the scientific communication competence of students who have conducted hands-on laboratory activities, especially multimedia laboratories. The conclusion that can be drawn from this research is that the inquiry-oriented student laboratory activity sheet by utilizing hands on laboratories and multimedia laboratories can be used to improve students' scientific communication skills.
Penerapan Jaringan Syaraf Tiruan Untuk Prediksi Daya Fotovoltaik Dengan Boost Converter KUNCORO, BAGUS TRI
SIMETRIS Vol 18 No 2 (2024): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v18i2.496

Abstract

The power system must be planned and operated with an estimate of the optimal photovoltaic output power. Direct sunlight can be converted into electrical energy using photovoltaic (PV) technology. The amount of electrical energy produced by solar modules can be influenced by the amount of sunlight it receives. This study discusses the simulation of the prediction of the output power of a photovoltaic system and boost converter with MPPT, in the next 1 hour using the backpropagation artificial neural network (ANN) method approach. In this study, the learning rate used is 0.01 and the minimum error target is 0.001 with 5 predetermined network architectures. The best performance prediction results with the smallest Mean Squared Error (MSE) value were obtained with the backpropagation neural network structure of the 4-6-1 model which was almost close to its actual value, but further research is still needed so that the prediction results can be even better.

Page 17 of 18 | Total Record : 176

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