SIMETRIS

Pengujian Bending & Struktur Mikro Sambungan Temu Bahan AISI 1010 dgn Variasi Arus pd Pengelasan SMAW

Eko Sutarto — Mon, 30 Dec 2024 00:00:00 +0700

The aim of this research is to determine the flexural strength of AISI 1010 material which meets the ASME BPVC acceptance criteria. IX QW-163 bending test results using the face bend test method, observing the possibility of cracks on the tensile side of the surface of the test object using the dye penetrant test method and the possibility of changes in the microstructure of the joints in electric arc welding with a current of 70, 80 and 90 A with using E6013 electrodes with a diameter of 2.6 mm. From the results of the bending test, the average bending stress data obtained from welds with currents of 70, 80, and 90A were 973.67, 986.3, and 1,049.46 MPa respectively, while from the observation results there were no cracks on the tensile surface of the test object, and from the comparison of microphotographs before and after welding there is no significant change in microstructure.

Penerapan Jaringan Syaraf Tiruan Untuk Prediksi Daya Fotovoltaik Dengan Boost Converter

BAGUS TRI KUNCORO — Mon, 30 Dec 2024 00:00:00 +0700

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.

Evaluasi Kerusakan Jalan dan Drainase Jalan (Studi Kasus : Ruas Jalan Sorogo – Gajahmada – Hayamwuruk, Kecamatan Cepu, Kabupaten Blora)

Hartono Guntur Ristiyanto — Mon, 30 Dec 2024 00:00:00 +0700

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

Ahmad Himam Auliya, Nagita Rahmasari, Adhika Pramita Widyassari — Mon, 30 Dec 2024 00:00:00 +0700

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, Irgianto Candra Adiaksa — Mon, 13 Jan 2025 15:06:46 +0700

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.

Peningkatan Kompetensi Berkomunikasi Ilmiah Dengan Laboratorium Berbantuan Komputer

Ratna Dwi Rahayu — Mon, 13 Jan 2025 00:00:00 +0700

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.

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)

Andi Rahmanto Rahmanto — Wed, 15 Jan 2025 00:00:00 +0700

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

PENGGUNAAN TEKNIK DIGITAL IMAGE PROCESSING DALAM MENENTUKAN UKURAN DIAMETER GELEMBUNG BERUKURAN MIKRO

Drajat Indah Mawarni — Wed, 15 Jan 2025 20:30:09 +0700

This study examines the use of Digital Image Processing techniques to measure and analyze the distribution of microbubble diameters in a swirl flow type Microbubble Generator with variations in water flow rate (QL) and air flow rate (QG). Digital image processing techniques were chosen because they can perform measurements automatically, quickly, and consistently, compared to conventional methods which are often slow and less accurate. This study uses MATLAB R2021a with the Image Processing Toolbox to process video recordings from a Canon 1200D camera, which are converted and extracted into images in TIF format. This study focuses on the distribution of bubbles in water discharge conditions of 24 lpm, 32 lpm, and 40 lpm and variations in air discharge from 0.1 to 0.8 lpm.

The results of the analysis show that at low water discharge (24 lpm), the bubble size tends to be smaller and more centralized, while at higher water discharge (32 lpm and 40 lpm), the bubble size distribution is more even and varied. The final result of this image processing data extraction is the distribution of microbubble diameters expressed in the Probability Distribution Function (PDF) and is used to present a comparison of the distribution of air bubble dimensions produced by MBG. Challenges faced in this study include validation at high QG, where there are deviations in the distribution results due to imaging quality or physical interference.

Pemodelan, Simulasi, dan Analisis Sistem Regulator Tegangan Otomatis Generator Sinkron Dengan Pengendali PID

Ari Puji Prasetiyo — Mon, 20 Jan 2025 15:50:35 +0700

Kemampuan suatu generator sinkron untuk mempertahankan tegangan terminal ketika terjadi perubahan beban terhubung adalah salah satu karakteristik fundamental dalam analisis stabilitas sistem tenaga. Regulator tegangan otomatis, yang bertanggung jawab terhadap proses stabilisasi tergangan terminal, merupakan suatu sistem kendali umpan balik yang mengukur tegangan keluaran untuk dibandingkan dengan tegangan referensi yang selanjutnya menghasilkan sinyal galat. Pada gilirannya sinyal galat ini akan mengendalikan sistem eksitasi setelah mengalami amplifikasi. Artikel ini membahas pemodelan, simulasi, dan analisis dari sistem regulator tegangan otomatis sederhana. Perangkat yang dipergunakan membangun model sistem adalah penguat, pengeksitasi, generator, dan sensor tegangan yang masing-masing direpresentasikan sebagai sistem orde satu dalam domain frekuensi. Analisis stabilitas Routh-Hurwitz yang diverifikasi dengan root-locus digunakan untuk menentukan nilai gain dari penguat yang menghasilkan sistem kendali stabil. Respons langkah diperbaiki dengan menyertakan stabilisator orde satu dengan satu zero di titik asal. Untuk mengetahui pengaruh nilai gain terhadap karakteristik respons langkah dilakukan parameter sweep terhadap gain dari penguat dan stabilisator. Karakteristik respons langkah yang diamati adalah waktu naik, waktu tunak, dan overshoot. Pengendali PID digunakan untuk mereduksi galat keadaan stabil respons langkah. Melalui penalaan pengendali PID diperoleh respons langkah sistem tanpa galat keadaan stabil, overshoot yang rendah, dan waktu naik serta waktu tunak yang singkat.