Journal of Mechanical Design and Testing最新文献

Studi Eksperimental Pengaruh Convective Heat Transfer terhadap Pressure Drop pada Aliran Dua Fase Gas-Cair Fluida Newtonian dan non-Newtonian dalam Square Microchannel 方形微通道中牛顿流体和非牛顿流体两相气-液流动中对流传热对压降影响的实验研究

Journal of Mechanical Design and Testing Pub Date : 2023-12-19 DOI: 10.22146/jmdt.73376

Luqman Al Huda

{"title":"Studi Eksperimental Pengaruh Convective Heat Transfer terhadap Pressure Drop pada Aliran Dua Fase Gas-Cair Fluida Newtonian dan non-Newtonian dalam Square Microchannel","authors":"Luqman Al Huda","doi":"10.22146/jmdt.73376","DOIUrl":"https://doi.org/10.22146/jmdt.73376","url":null,"abstract":"Penelitian terkait dua fase gas-cair dalam saluran mikro telah banyak dilakukan. Namun, keterlibatan fluida non-newtonian serta kalor dalam aliran dua fase suatu saluran mikro masih rendah, terutama pemecahan masalah pada pendinginan perangkat mikro. Permintaan terhadap efisiensi aliran fluida dua fase dalam mengikat kalor menjadi parameter penting dalam keberhasilan sistem pendinginan. Tujuan penelitian ini membandingkan beda tekanan antara fluida newtonian dan non-newtonian dengan viskositas berbeda pada aliran dua fase. Penelitian juga menambahkan perlakuan kalor dan mengamati pada dua area, yaitu sebelum (upstream) dan sesudah (downstream) terdampak kalor. Jenis fluida cair newtonian yang digunakan yaitu aquadest dan fluida non-newtonian yaitu Carboxymethil Cellulose (CMC wt 0,4%), sedangkan fluida gas yang digunakan adalah nitrogen. Dimensi diameter hidrolis saluran sebesar 0,8 mm. Kecepatan superfisial cairan divariasikan mulai 0,082 m/s hingga 1,025 m/s, sedangkan kecepatan superfisial gas divariasikan mulai 0,26 m/s hingga 7,81 m/s. High speed video camera digunakan untuk merekam pola aliran, panjang dan kecepatan gelembung terbentuk. Hasil aliran nitrogen-aquadest membentuk pola aliran bubbly, slug, churn dan wavy-annular. Penambahan kalor mampu memberikan beda tekanan yang lebih rendah pada downstream daripada upstream diiringi dengan penurunan viskositas cairan. Oleh sebab itu, kecepatan suatu gelembung meningkat dan mudah menembus fluida CMC dengan terbentuk pola aliran slug dan slug-annular.","PeriodicalId":201653,"journal":{"name":"Journal of Mechanical Design and Testing","volume":" 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138961652","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Components Design of Cube Cutter for Fruit and Meat: Strength Analyses Under Static and Fatigue Conditions 水果和肉类立方体切割机的部件设计：静态和疲劳条件下的强度分析

Journal of Mechanical Design and Testing Pub Date : 2023-12-19 DOI: 10.22146/jmdt.74251

Ryan Antonio, Dwiartha Pambudi Alif Sutrisno, Farid Triawan

引用次数: 0

Studi awal fenomena osilasi antarmuka air-udara pada pipa vertikal dan hubungannya dengan frekuensi osilasi dan level getaran 垂直管道中水气界面振荡现象及其与振荡频率和振动水平关系的初步研究

Journal of Mechanical Design and Testing Pub Date : 2023-12-19 DOI: 10.22146/jmdt.73688

S. Sucipto

{"title":"Studi awal fenomena osilasi antarmuka air-udara pada pipa vertikal dan hubungannya dengan frekuensi osilasi dan level getaran","authors":"S. Sucipto","doi":"10.22146/jmdt.73688","DOIUrl":"https://doi.org/10.22146/jmdt.73688","url":null,"abstract":"Fluida dapat digunakan untuk meneruskan energi mekanika namun dengan keterbatasan tertentu yang salah duanya adalah stabilitas dan tegangan permukaan fluida yang dipengaruhi oleh gaya tarik-menarik antar molekul. Dari proses transfer energi mekanika tersebut, studi awal untuk mengetahui pengaruh osilasi antarmuka air-udara akibat dari instabilitas antarmuka fluida pada pipa dilakukan. Pipa vertikal dan plunger diinstalasi secara aksial dengan permanent magnet exciter yang menerima input sinyal dari tone generator yang telah dikuatkan oleh power amplifier. Variasi amplitudo dan frekuensi osilasi dari exciter diinvestigasi untuk menjelaskan fenomena instabilitas antarmuka fluida, yang dapat terlihat secara visual, akibat dari level getaran amplitudo tertentu yang diukur dengan menggunakan accelerometer. Grafik antara input frekuensi osilasi dengan amplitudo getaran pada saat terjadi instabilitas antarmuka fluida dibuat dengan pengambilan data level amplitudo getaran dengan rentang frekuensi dari 6 – 50 Hz dengan variasi diameter dalam pipa 40mm dan 50mm serta variasi volume 10-50 mL. Hasil pengukuran pada pipa dengan diameter dalam 40mm maupun 50mm menunjukkan bahwa dari setiap frekuensi yang diuji memiliki level amplitudo getaran yang unik untuk memicu terjadinya fenomena instabilitas antarmuka. Secara umum, bertambahnya frekuensi menyebabkan level amplitudo getaran yang dibutuhkan hingga memicu instabilitas cenderung menurun. Level amplitudo getaran yang dibutuhkan juga menurun seiring bertambahnya volume pada diameter pipa yang sama. Pipa dengan diameter dalam yang lebih besar, dalam penelitian ini 50 mm, membutuhkan level getaran yang lebih tinggi untuk menyebabkan instabilitas antarmuka dibanding pipa dengan diameter dalam 40 mm.","PeriodicalId":201653,"journal":{"name":"Journal of Mechanical Design and Testing","volume":" 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138961776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Desain dan Analisis Kompresor Sentrifugal pada Jet Engine Menggunakan Metode CFD 使用 CFD 方法设计和分析喷气发动机离心压缩机

Journal of Mechanical Design and Testing Pub Date : 2023-12-19 DOI: 10.22146/jmdt.66148

B. Fathoni

{"title":"Desain dan Analisis Kompresor Sentrifugal pada Jet Engine Menggunakan Metode CFD","authors":"B. Fathoni","doi":"10.22146/jmdt.66148","DOIUrl":"https://doi.org/10.22146/jmdt.66148","url":null,"abstract":"Perkembangan dalam dunia penerbangan semakin pesat setiap tahunnya. Hal ini termasuk pada perkembangan pada Unmanned Aerial Vehicle (UAV). Salah satu perkembangan pada UAV yang dapat menjadi fokus dalam penelitian lebih lanjut adalah pada sistem propulsinya. UAV dapat menggunakan jet engine yang memiliki thrust-to-weight ratio yang lebih tinggi sehingga dapat menerbangkan UAV lebih efektif dengan dikembangkannya kompresor sentrifugal yang dipakai pada mesin jet berskala kecil, yang mana memiliki rasio kompresi lebih tinggi dengan hanya satu tingkat, sehingga menurunkan berat mesin keseluruhan. Penelitian ini diawali dengan mempelajari desain komponen kompresor sentrifugal satu tingkat, yakni impeller dan diffuser. Setelah itu, dibuat model 3D pada software permodelan 3D yang kemudian di-mesh pada software ANSYS. Model yang telah di-mesh ini kemudian disimulasikan pada software ANSYS CFX yang memiliki basis Computational Fluid Dynamics. Setelah itu, dilakukan validasi hasil simulasi dengan teori perhitungan sesuai rumus yang telah dipelajari. Metode simulasi yang telah valid dapat dilanjutkan untuk mengetahui efek membesarkan saluran outlet terhadap rasio tekanan, efisiensi, dan kecepatan outlet pada kompresor sentrifugal tersebut. Hasil yang telah didapatkan menunjukkan penurunan rasio tekanan, efisiensi jika melebihi besar outlet optimal, serta penurunan kecepatan outlet yang sebanding dengan besar outlet diffuser. Dari simulasi yang telah dilakukan didapatkan hasil terbaik pada outlet sebesar 1.25 kali inlet dengan rasio kompresi dan efisiensi tidak turun dengan kecepatan outlet yang lebih rendah.","PeriodicalId":201653,"journal":{"name":"Journal of Mechanical Design and Testing","volume":"113 43","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138959195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

KARAKTERISASI SIFAT FISIS, MEKANIS DAN REDAMAN AKUSTIK KAYU LOKAL SEBAGAI BAHAN ALAT MUSIK 表征当地木材作为乐器材料的物理、机械和声学阻尼特性

Journal of Mechanical Design and Testing Pub Date : 2023-12-19 DOI: 10.22146/jmdt.74965

Sugeng Slamet, Budi Santoso, Q. Qomaruddin

{"title":"KARAKTERISASI SIFAT FISIS, MEKANIS DAN REDAMAN AKUSTIK KAYU LOKAL SEBAGAI BAHAN ALAT MUSIK","authors":"Sugeng Slamet, Budi Santoso, Q. Qomaruddin","doi":"10.22146/jmdt.74965","DOIUrl":"https://doi.org/10.22146/jmdt.74965","url":null,"abstract":"Tanaman hutan tropis seperti gempol, sonokeling, mahoni, trembesi dan duren tumbuh subur. Selama ini pemanfaatan kayu hutan tersebut hanya digunakan untuk bahan mebelair serta konstruksi bangunan secara turun temurun. Tidak cukupnya referensi terhadap karakteristik kayu lokal tersebut, menyebabkan pemanfaatnya tidak maksimal.Metode yang dilakukan adalah menentukan jenis kayu lokal meliputi kayu jenis gempol dan mahoni. Spesimen dilakukan foto makro, selanjutnya dilakukan pengujian kadar air, densitas, kekuatan tarik dan kekuatan bending. Pengujian sifat akustik dilakukan pada produk alat musik jenis biola terhadap kedua kayu tersebut.Hasil pengujian menunjukkan struktur serat kayu mahoni lebih halus dengan orientasi searah, sedangkan kayu gempol menunjukkan serat kasar dengan orientasi random. Kadar air kayu lokal jenis mahoni 35,39% lebih rendah dibandingkan jenis gempol 49,98%. Densitas kayu mahoni 2,32 gr/cm3 lebih tinggi dari kayu gempol 2,00 gr/cm3. Kayu lokal jenis mahoni mempunyai kekuatan tarik 60,46 MPa dengan kekuatan luluh 50,03 MPa, sedangkan kayu lokal jenis gempol 42,97 MPa dengan kekuatan luluhnya 35,56 MPa. Kekuatan bending kayu lokal jenis mahoni 87,96 MPa dan kayu gempol 66,50 MPa. Redaman akustik kayu lokal jenis mahoni sebesar R² = 0.2221, kayu gempol R² = 0.1934, sedangkan kayu import jenis sprue sebesar R² = 0.3574.","PeriodicalId":201653,"journal":{"name":"Journal of Mechanical Design and Testing","volume":"112 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138959308","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Karakteristik Aliran Turbin Hidrokinetik Savonius Susunan Inward dan Outward Overlap dengan Dua Semicircular Blade-Flat Leading Edge 具有两个半圆形叶片-平前缘的向内和向外重叠布置的萨沃尼乌斯水动能涡轮机的流动特性

Journal of Mechanical Design and Testing Pub Date : 2023-12-19 DOI: 10.22146/jmdt.74371

Khoiri Rozi

引用次数: 0

Operational Excellence of Hydro Power Plant With “G-Action Mobile” 水电站利用 "G-Action Mobile "实现卓越运营

Journal of Mechanical Design and Testing Pub Date : 2023-06-13 DOI: 10.22146/jmdt.85642

Arry Erawan, Wahyu Kurnia, Muhammad Nur Muharramsyahputra

{"title":"Operational Excellence of Hydro Power Plant With “G-Action Mobile”","authors":"Arry Erawan, Wahyu Kurnia, Muhammad Nur Muharramsyahputra","doi":"10.22146/jmdt.85642","DOIUrl":"https://doi.org/10.22146/jmdt.85642","url":null,"abstract":"The Gunung Wugul Mini Hydro Electric Power Plant (MHEPP) is a run of river power plant with a Commercial Operation Date (COD) of December 3, 2021, by PT PLN UP2D Central Java-Special Region of Yogyakarta. The application of corporate culture and regulations to run the operations of the Generating Unit such as asset management, Occupational Health and Safety Management System (SMK3) and Security Management System (SMP) require a high level of effort. Socialization and implementation related to the management of the Generating Unit must be carried out to the lowest level for the realization of good management. Focusing on Operational Excellence built on Shingo House Method, where elements of organizational leadership focus on the application of principles, systems, and tools to build superior performance factors by making continuous improvements. The implementation of G-Action Mobile optimizes digital technology and supports the company's program, namely digital transformation for control operations, maintenance, security, and Occupational Health and Safety (OHS) activities more effectively. The G-Action Mobile application can encourage the acceleration of the implementation of corporate culture within the Gunung Wugul MHEPP so that the achievement of a capability factor of 67.16% of the 33.60% target, the issuance of a Zero Accident decree, and the implementation of a security management system that is tight enough to support environmental conditions that can improve unit performance with conditions comfortable and safe.","PeriodicalId":201653,"journal":{"name":"Journal of Mechanical Design and Testing","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139370134","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Motor Control Center Breaker Modification Through On/Off Switch to Prevent Motor Failure 通过开/关开关改造电机控制中心断路器以防止电机故障

Journal of Mechanical Design and Testing Pub Date : 2023-06-13 DOI: 10.22146/jmdt.85643

Ahmad Rosyiddin, Imam Maulana Arief, Novarino Herdyan Minanta

引用次数: 0

Modification of The Oil Cooler to Avoid Oil Leaking in Generator Transformer PLTU Labuan “Moderator” 改造油冷却器以避免发电机变压器漏油拉布恩公共交通大学 "主持人"

Journal of Mechanical Design and Testing Pub Date : 2023-06-13 DOI: 10.22146/jmdt.85644

Prima Galih Pratama, Setyawan Santoso, Shandy Helmi Ramadhan

{"title":"Modification of The Oil Cooler to Avoid Oil Leaking in Generator Transformer PLTU Labuan “Moderator”","authors":"Prima Galih Pratama, Setyawan Santoso, Shandy Helmi Ramadhan","doi":"10.22146/jmdt.85644","DOIUrl":"https://doi.org/10.22146/jmdt.85644","url":null,"abstract":"The Main Generator Transformer for PLTU Labuan is a transformer with a power capacity of 350 MVA and a cooling system of 6 pcs OFAF (Oil Force Air Force) type. During operation, a disturbance to the Main Generator Transformer (GT) was caused by an oil cooler leak. This is caused by the corrosive expand tube caused by the constituent material consisting of 2 different types of materials. The oil leak caused environmental pollution, decreased oil level, and increased winding temperature and oil temperature on GT. During the decade of operation of the PLTU Labuan, GT oil cooler leaks almost always occur every year, both in unit 1 and unit 2. To anticipate this, we made modifications to the end tube design by changing the type of material on the expanded tube from initially using iron to aluminum such as tube material outside the expanded position. The next design change is to increase the length of the end tube which is equipped with the knock and glue with an expansion strength above normal operating temperature which makes the end tube more reliable by increasing the surface area attached to the body oil cooler. In addition to making changes to the design, this modification reuses used oil coolers that have good tube quality so that they can be reused with more reliable quality. By making these modifications, it can increase the readiness of generating unit production (EAF) by 3.33% in one MO event due to the replacement of the oil cooler generator transformer and lower maintenance costs for the required transformer oil cooler. The modified Oil Cooler was installed during the Maintenance Outage in Unit 1 and Overhaul unit 2 in 2021 and is still operating well for 20 months of operation.","PeriodicalId":201653,"journal":{"name":"Journal of Mechanical Design and Testing","volume":"31 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139370137","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Recognition of Safety Helmet Wearing Of Operator Local Ground Floor Unit 2 Suralaya PGU Based On Improved YOLOv3 基于改进的 YOLOv3，识别当地 Suralaya PGU 2 号地面单元操作员的安全帽佩戴情况

Journal of Mechanical Design and Testing Pub Date : 2023-06-13 DOI: 10.22146/jmdt.85645

Firlan Maulana Ruaz

{"title":"Recognition of Safety Helmet Wearing Of Operator Local Ground Floor Unit 2 Suralaya PGU Based On Improved YOLOv3","authors":"Firlan Maulana Ruaz","doi":"10.22146/jmdt.85645","DOIUrl":"https://doi.org/10.22146/jmdt.85645","url":null,"abstract":"PT. PLN Indonesia Power Suralaya Power Generation Unit requires its operators on the local ground floor to wear safety helmets to prevent head injuries while performing their tasks. Observation of workers wearing safety helmet must be ensured by the company to prevent head injury by operators. The Culture Transformation Program of K3 PT PLN Indonesia Power brings a new observation method to detect safety helmet wearing of operator local ground floor using real-time detection. YOLOv3 is an application which can be used to real-time detection helmet wearing of workers using the darknet53 algorithm based on YOLOv1 and YOLOv2 by using data images that have been collected. Based on YOLOv3 model, the improved version of YOLOv3 is proposed to improve accuracy and speed detection of safety helmet wearing by combining multi-scale detection training. Different YOLOv3 versions will be used to compare results of helmet recognition. The improved YOLOv3 show results 96.63% mAP50 and 725,711 milliseconds better than the other versions of YOLO to detect helmet safety. The experimental result show that the improved YOLOv3 have satisfying with the detection speed and accuracy of safety helmet wearing detection by operators at PT PLN Indonesia Power Suralaya Power Generation Unit.","PeriodicalId":201653,"journal":{"name":"Journal of Mechanical Design and Testing","volume":"49 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139370212","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0