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Analisis Perbedaan Mesh Pada Simulasi Boiler PLTGU Tanjung Priok Berbasis CFD I Nyoman Agus Adi Saputra; I Gusti Bagus Wijaya Kusuma; I Gusti Ngurah Priambadi
Jurnal Mettek: Jurnal Ilmiah Nasional dalam Bidang Ilmu Teknik Mesin Vol 6 No 1 (2020)
Publisher : Program Studi Magister Teknik Mesin Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/METTEK.2020.v06.i01.p06

Abstract

Penelitian Analisis Perbedaan Mesh berbasis Computational Fluid Dynamic (CFD) ini dilakukan Pada Boiler PLTGU Tanjung Priok. Boiler atau reboiler dalam sistem PLTGU dikategorikan sebagai alat penukar kalor karena perpindahan panasnya dilakukan tanpa kontak langsung antara media pemanas dengan media yang dipanaskan. Fluida kerja pada boiler PLTGU Tanjung Priok berupa gas methane dan air. Penelitian ini bertujuan melihat jumlah pembagian elemen terhadap hasil simulasi dengan menggunakan dua model Studi konvergensi grid yaitu dengan grid kasar, dan yang paling optimal melalui hasil simulasi CFD. Metode yang digunakan mulai dari mendesain geometri boiler sesuai kondisi di lapangan menginput initial conditions dan boundry conditions. Data hasil penelitian yang sudah di lakukan pada simulasi boiler menunjukkan bahwa baik temperatur, tekanan dan kecepatan aliran memiliki nilai yang sama besar dan tidak di pengaruhi oleh pembagian elemen yang di lakukan pada saat proses meshing dari elemen yang paling kasar dengan jumlah total sebanyak 203.363 sampai pada tahap proses meshing dengan elemen teroptimal yang berjumlah sebanyak 1.491.428 berdasarkan hal tersebut maka proses simulasi yang dilakukan menjadi lebih efisien karena proses perhitungan data dari elemen yang lebih sedikit mendapatkan hasil yang sama dengan elemen yang lebih banyak. The research on Mesh Difference Analysis based on Computational Fluid Dynamic (CFD) was conducted at Tanjung Priok PLTGU Boiler. Boilers or reboilers in PLTGU systems are categorized as heat exchangers because the heat transfer is done without direct contact between the heating media and the heated media. The working fluid in the Tanjung Priok gas power plant boiler is in the form of methane gas and water. This study aims to look at the number of elements divided against the simulation results by using two grid convergence study models, namely with a coarse grid, and the most optimal through CFD simulation results. The method used starts from designing the boiler geometry according to the field conditions, inputting initial conditions and boundry conditions. Data from research that has been done on boiler simulations shows that both temperature, pressure and flow velocity have the same value and are not affected by the division of elements carried out during the meshing process of the most coarse elements with a total number of 203.363 up to the meshing process stage with the optimum elements totaling 1,491,428 based on this, the simulation process carried out becomes more efficient because the process of calculating data from fewer elements gets the same results with more elements.
Analisis Defleksi Pada Rangka Alat Pembuat Briket Sampah Organik Gregorius Agung Pamungkas; I Gusti Ngurah Priambadi; Anak Agung Istri Agung Sri Komaladewi
Jurnal Mettek: Jurnal Ilmiah Nasional dalam Bidang Ilmu Teknik Mesin Vol 6 No 2 (2020)
Publisher : Program Studi Magister Teknik Mesin Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/METTEK.2020.v06.i02.p06

Abstract

Rangka merupakan bagian yang paling penting dari sebuah konstruksi dimana kekuatan rangka sangat ditentukan dari bentuk dan dimensi. Kekuatan rangka pada konstruksi harus memenuhi aspek keamanan serta harus memperhatikan faktor kekuatan rangka itu sendiri. Menghitung kekuatan rangka dari alat pembuat briket sampah organik dilakukan dengan menggunakan cara simulasi untuk mengetahui kekuatan rangka dalam menerima beban. Simulasi yang dilakukan dengan menggunakan software SolidWorks 19 dengan pembebanan statis, dan dengan variasi beban 110 kg dan 4500 kg dengan menggunakan material baja tipe ASTM A36. Proses simulasi yang telah dilakukan dengan pembebanan 110 kg nilai tegangan maksimum sebesar 6.66046 N/mm2 (Mpa), nilai displacement maksimum sebesar 0.0114 mm, nilai strain maksimum sebesar 0.0000167973 mm, dan nilai safety factor minimal sebesar 38. Dengan pembebanan 4500 kg nilai tegangan maksimum sebesar 248.26596 N/mm2 (Mpa), nilai displacement maksimum sebesar 0.4231 mm, nilai strain maksimum sebesar 0.0006269075 mm, dan nilai safety factor minimal sebesar 1. Pembebanan 110 kg rangka masih dapat menahan beban dan nilai stress masih jauh dari standar yield strength material ASTM A36 sebesar 250 Mpa. Terdapat perubahan bentuk rangka saat dilakukan pembebanan tetapi masih bersifat elastis, pada pembebanan 4500 kg rangka tidak dapat menahan beban dan nilai stress mendekati standar yield strength material ASTM A36 sebesar 250 Mpa. Hasil simulasi menunjukkan bahwa rangka alat pembuat briket sampah organik dengan beban 110 kg dan dengan material Baja tipe ASTM A36 mampu menahan beban dengan lebih baik. Dibandingkan dengan beban 4500 kg dan dengan material yang sama. The frame is the most important part of a construction where the strength of the frame is very much determined from the shape and dimensions. The strength of the frame in construction must fulfill the safety aspect and pay attention to the strength factor of the frame itself. Calculating the strength of the frame from the organic waste briquette maker is done by using a simulation method to see the strength of the frame in receiving the load. Simulations carried out using solidWorks 19 software with static loading with a load variation of 110kg and 4500 kg using ASTM A36. The simulation process that has been carried out with a load of 110 kg with a maximum stress value of 6.66046 N / mm2 (Mpa), a maximum displacement value of 0.0114 mm, a maximum strain value of 0.0000167973 mm, and a minimum safety factor value of 38. At the load of 4500 kg the maximum stress value is 248.26596 N/mm2 (Mpa), the maximum displacement value is 0.4231 mm, the maximum strain value is 0.0006269075 mm, and the safety factor value is at least 1. A load of 110 kg the frame can still with stand the load and the stress value is still far from the standard yield strength material ASTM A36 of 250 Mpa. There is a change in the shape of the frame when it is charged but still elastic, at the load of 4500 kg the frame cannot with stand the load and the stress value is close to the standard yield strength material ASTM A36 of 250 Mpa. Simulation results showed that the frame of the organic waste briquette making tool with a load of 110 kg and with steel material type ASTM A36 is able to with stand the load better. Compared to a load of 4500 kg and with the same material.
Serapan Air dan Ketahanan Bakar pada Material Komposit Hibrid Epoxy Berpenguat Serat Bambu / Jelatang Mokh Bima Dwi Oktavian; I Gede Putu Agus Suryawan; I Gusti Ngurah Priambadi
Jurnal Mettek: Jurnal Ilmiah Nasional dalam Bidang Ilmu Teknik Mesin Vol 9 No 1 (2023)
Publisher : Program Studi Magister Teknik Mesin Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/METTEK.2023.v09.i01.p03

Abstract

Kemajuan teknologi pada bahan non logam sangat mendominasi penggunaan material komposit di bidang rekayasa industri. Komposit sebagai pengganti material logam dalam rekayasa industri sudah semakin meluas dalam bidang industri teknik mesin dan transportasi seperti komponen otomotif, bodi kendaraan, interior pesawat dan kapal laut. Penelitian komposit ini berpenguat serat alam berupa serat jelatang dan serat bambu dengan matrik epoksi. Peneliti memberikan perlakuan perendaman serat dengan 5% NaOH selama 2 jam. Komposit hibrid serat bambu/jelatang dengan panjang 10 mm dan disusun secara acak dengan proses produksi hand lay-up. Penelitian ini menggunakan fraksi volume serat 30% dengan jumlah perbandingan serat bambu/jelatang 100%:0%(A), 75%:25%(B), 50%:50%(C), 25%:75%(D), 0%:100%(E) dan sebagai pembanding adalah matriks yang dicetak tanpa penguat (A0). Penelitian ini diharapkan dapat memberikan hasil material komposit yang memiliki sifat yang tahan air dan tahan api. Pengujiannya adalah Serapan Air, dan Ketahanan Bakar. Hasil pengujian serapan air tertinggi pada spesimen (A) sebesar 5,31% dan terendah pada spesimen (E) sebesar 3,7%. Hasil serapan air komposit hybrid dengan jumlah serat bambu/jelatang (B) sebesar 4,93% memiliki serapan air lebih tinggi dari spesimen (D) sebesar 4,37%. Hasil pengujian bakar menunjukkan nilai laju pembakaran tertinggi pada sampel (E) sebesar 10,63 mm/s dan terendah pada sampel (A) sebesar 6,89 mm/s. hasil laju pembakaran komposit hibrid jumlah serat bambu/jelatang (B) dengan nilai laju pembakaran 7,24 mm/s, sedangkan komposit serat bambu/jelatang (D) diperoleh nilai laju pembakaran 8,63 mm/s. Technological advances in non-metallic materials dominate the use of composite materials in industrial engineering. Composites as a substitute for metal materials in industrial engineering have expanded in the mechanical engineering and transportation industries such as automotive components, vehicle bodies, aircraft interiors and ships. This composite research is reinforced with natural fibers in the form of nettle and bamboo fiber with an epoxy matrix. The researcher gave the fiber immersion treatment with 5% NaOH for 2 hours. Bamboo/ nettle fiber hybrid composite with a length of 10 mm and arranged randomly with a hand lay-up production process. This study uses a fiber volume fraction of 30% with a ratio of bamboo/nettle fiber 100%:0%(A), 75%:25%(B), 50%:50%(C), 25%:75%(D), 0%:100%(E) and comparison is the matrix printed without reinforcement (A0). This research is expected to give results of composite materials that have water-resistant and fire-resistant properties. The tests are Water Absorption and Fire Resistance. The results of the highest water absorption test in specimen (A) of 5.31% and the lowest on specimen (E) of 3.7%. The results of the hybrid composite water absorption with the amount of bamboo/nettle fiber (B) of 4.93% had a higher water absorption than that of the specimen (D) of 4.37%. The results of the burn test showed that the highest burning rate was in sample (E) at 10.63 mm/s and the lowest was 6.89 mm/s in sample (A). The results of the hybrid composite burning rate of bamboo/nettle fiber (B) with a burning rate value of 7.24 mm/s, while the bamboo/nettle fiber composite (D) obtained a burning rate value of 8.63 mm/s.
Analisis Pengendalian Kualitas Sheet Mask dengan Metode SQC di PT X Makarawung, Advenni Natalia; I Gusti Ngurah Priambadi; Ni Made Cyntia Utami; I Made Dwi Budiana Penindra; Desak Ayu Sista Dewi; Bryan Estavan Imanuel Sitanggang
JURNAL RISET DAN APLIKASI TEKNIK INDUSTRI Vol. 1 No. 01 (2023): Volume 2 Desember (2023)
Publisher : Study Program of Industrial Engineering, Udayana University

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Abstract

PT X is a manufacturing industry company engaged in cosmetic and skincare manufacturing services that produce products based on order or PO (pre-order). In the production process carried out by PT X, there are several product defects such as damaged masks, packaging, and so on so that the product is not suitable for use and reaches consumers, for that the importance of the production process control system in a company in identifying factors causing damage or defects in sheet mask products and analyzing how to apply statistical quality control in quality control at PT X. The results of the pareto chart analysis with the most frequent problems to get priority for repair, namely the type of plastic defect (53%). Based on the P-chart analysis the production process is still not under control or still experiencing deviations, this is shown on the P-chart that many points are beyond the control limit. Known from the results of diagram analysis fishbone related factors causing plastic defects come from human, machine, and material factors. Companies should conduct training for employees on the shrink process, conduct regular checks on production machines and replace plastic materials that are thicker than before.
REDESIGN KURSI BUS YANG ERGONOMIS DENGAN PENDEKATAN ANTROPOMETRI (STUDI KASUS BUS TRANS METRO DEWATA) Krisna, I Gusti Ngurah Bagus Hermaya; I Gusti Ngurah Priambadi; Ni Luh Putu Lilis Sinta Setiawati; I Made Dwi Budiana Penindra; Mia Juliana; Ni Made Cyntia Utami
JURNAL RISET DAN APLIKASI TEKNIK INDUSTRI Vol. 1 No. 01 (2023): Volume 2 Desember (2023)
Publisher : Study Program of Industrial Engineering, Udayana University

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Abstract

Due to passenger complaints regarding the comfort of the seats on the Trans Metro Dewata Bus, and the possibility that the design of the seats could result in musculoskeletal disorders (MSDs), it is deemed necessary to redesign the seats of the Trans Metro Dewata Bus to create an ergonomic seat design. In the process of redesigning the bus seats, the ergonomics method with an anthropometric approach was used. The ergonomic approach in question is to adjust the seat design to the anthropometric dimensions of the sample of Trans Metro Dewata Bus passengers. In this anthropometric approach, four anthropometric dimensions are determined which play an important role in chair redesign, namely (1) shoulder height, (2) knee fold (popliteal), (3) hip width, and (4) distance from knee fold (popliteal) to buttocks. For each dimension, calculations were carried out according to the procedure for 100 sample data that had been taken from passengers of the Trans Metro Dewata Corridor 3 Bus in March 2023. Based on the passenger samples that had been obtained, then the anthropometric data testing process was carried out starting from the normality test, uniformity test data, and data adequacy test.
Desain Optimalisasi Peramalan Suku Cadang Berbasis Machine Learning I Dewa Made Wikananda Surya Kusuma; I Wayan Widhiada; Anak Agung Istri Agung Sri Komaladewi; I Gusti Ngurah Priambadi; Made Widiyarta; I Ketut Adi Atmika
Jurnal Mettek: Jurnal Ilmiah Nasional dalam Bidang Ilmu Teknik Mesin Vol 9 No 2 (2023)
Publisher : Program Studi Magister Teknik Mesin Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/METTEK.2023.v09.i02.p01

Abstract

Di era perkembangan revolusi industri 4.0 dan era digitalisasi saat ini, persaingan dunia bisnis kian sangat ketat dan sengit. Perusahaan mulai berlomba-lomba menciptakan strategi agar konsumen tidak berpindah ke kompetitor lain. Salah satu strategi agar konsumen tidak berpindah adalah dengan melakukan peramalan suku cadang, karena dengan adanya peramalan maka kegiatan produksi maupun jasa yang ada di perusahaan akan terus berjalan, sehingga berdampak kepada kepuasan pelanggan. Seiring dengan perkembangan zaman, untuk memenangkan persaingan, strategi yang dilakukan perusahaan juga bervariasi, seperti penerapan machine learning yang banyak dilakukan perusahaan besar. Penelitian ini memiliki tujuan untuk mendesain optimalisasi model peramalan dengan menggunakan machine learning. Penelitian ini membandingkan enam jenis model peramalan dengan dataset yang sudah disediakan. Model peramalan dapat dikatakan terbaik, apabila memiliki nilai MAE (Mean Absolute Error) yang terendah. Hasil penelitian menunjukkan model peramalan yang terbaik adalah model hybrid, yaitu model Optimize Neural Network (Autoencoder + LSTM), yang memiliki nilai MAE 0,5528. In the era of the development of the Industrial Revolution 4.0 and the current era of digitalization, competition in the business world is becoming very tight and fierce. Companies started to compete to create strategies so that consumers do not move to other competitors. One of the strategies to keep consumers from moving is to forecast spare parts, because with forecasting, the production and service activities in the company will continue to run, which has an impact on customer satisfaction. Along with the times, to win the competition, the strategies carried out by companies also vary, such as the application of machine learning that many large companies do. This research aims to design a forecasting model optimization using machine learning. This research compares six types of forecasting models with the provided data set. The forecasting model can be said to be the best if it has the lowest MAE (Mean Absolute Error) value. The results show that the best forecasting model is a hybrid model, namely the Optimize Neural Network (Autoencoder + LSTM) model, which has an MAE value of 0.5528.
ANALISIS OPTIMASI POLA MAINTENANCE TURBIN PADA PEMBANGKIT LISTRIK TENAGA AIR PT. NUSANTARA INFRASTRUCTURE DI KAB. DAIRI DENGAN METODE TOTAL PRODUCTIVE MAINTENANCE (TPM) Albert Heijn Timisela; I Gusti Ngurah Priambadi; Ni Luh Putu Lilis Sinta Setiawati; I Wayan Bandem Adnyana; I Gusti Agung Kade Suriadi
Kohesi: Jurnal Sains dan Teknologi Vol. 4 No. 8 (2024): Kohesi: Jurnal Sains dan Teknologi
Publisher : CV SWA Anugerah

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.3785/kohesi.v4i8.6042

Abstract

Listrik merupakan kebutuhan primer bagi setiap lapisan masyarakat dalam kehidupan sehari-hari. Sama halnya seperti PLTA Lau Gunung yang membutuhkan pasokan listrik untuk beroperasi. Perawatan pada fasilitas produksi yang digunakan merupakan hal yang sangat penting dalam upaya mencegah terjadinya downtime, serta menjaga kualitas dan kuantitas produk yang dihasilkan oleh PLTA Lau Gunung. Metode Total Productive Maintenance dengan perhitungan Overall Equipment Effectiveness dapat membantu perusahaan dalam mengetahui nilai aktual efektivitas mesin dan peralatan yang digunakan, serta menentukan tindakan perbaikan (improvement), yaitu pola maintenance seperti apa yang dapat dilakukan untuk mengurangi downtimeberdasarkan nilai efektivitas dari mesin atau peralatan yang digunakan. Setelah mendapatkan data produksi selama 5 semester dan berdasarkan hasil perhitungan Overall Equipment Effectiveness, didapati hasil perhitungan availability sebesar 83%, performance sebesar 81%, quality sebesar 76%, dan nilai OEE sebesar 51% yang berarti masih dibawah standar menurut JIPM. Selanjutnya, dengan metode Six Big Losses diketahui bahwa Reduced Speed Loss merupakan penyumbang downtime terbesar. Berdasarkan hasil perhitungan kedua metode tersebut, maka hasil penelitian ini adalah usulan rekomendasi perbaikan berupa tindakan perawatan maintenance seperti apa yang dapat dilakukan untuk meningkatkan OEE dan mencegah terjadinya downtime.
Perancangan Usulan Perbaikan Bagi Restoran Wizzmie Jimbaran Berdasarkan Faktor-Faktor Yang Memengaruhi Keputusan Pembelian Konsumen Baiq Devi Ariska; I Gusti Ngurah Priambadi; Ni Luh Putu Lilis Sinta Setiawati
Jurnal Sains Dan Teknologi | E-ISSN : 3063-9980 Vol. 1 No. 3 (2025): Januari - Maret
Publisher : GLOBAL SCIENTS PUBLISHER

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Abstract

This study discusses the factors that influence consumer purchasing decisions at Wizzmie Jimbaran Restaurant, namely product quality and service quality factors. The purpose of this study is to determine how product quality and service quality influence consumer purchasing decisions. The method used in this study is a quantitative method. The population in this study were consumers who had visited Wizzmie Jimbaran Restaurant from the population, the sample was determined based on research by Hair et al. (2010) sample = number of indicators x 5, then a sample of 80 people was obtained. The data analysis technique used the classical assumption test and hypothesis test with results based on research, product quality and service quality simultaneously had a significant influence on purchasing decisions and all independent variables partially had a significant effect on the dependent variable, but based on the results of the questionnaire, there needed to be a proposal for improvement, namely evaluating recipe standards and portions, attaching visual documentation of dishes, having the right measuring equipment, increasing the number of servers, increasing employee empathy, and providing comfortable facilities for customers waiting.
Desain Ulang Troli Pengering Mie dengan Metode Antropometri Joy Christian; I Gusti Ngurah Priambadi; Desak Ayu Sista Dewi; I Wayan Bandem Adnyana; I Gusti Agung Kade Suriadi; Ni Luh Putu Lilis Sinta Setiawati
JURNAL RISET DAN APLIKASI TEKNIK INDUSTRI Vol. 3 No. 01 (2025): Volume 03 Issue 01, Agustus 2025
Publisher : Study Program of Industrial Engineering, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JRATI.2025.v03.i01.p02

Abstract

Comfortable work can make it easier for employees to work. Good working processes can improve company performance and employees will work comfortably in their jobs. The noodle dryer currently used in industry X has employees complaining of pain in their body parts. Based on data collection in the Nordic Body Map form, this complaint arose due to the inappropriate height of the noodle hangers on the trolley. This research aims to reduce the level of complaints from workers by redesigning the noodle drying trolley in Industry X. This research uses an anthropometric approach to redesign and obtain an ergonomic trolley height. The trolley redesign is based on calculating percentile data to obtain a more ergonomic trolley height. After calculating the proper height of the trolley using the worker’s body height, the result of the ergonomic trolley height is 163.4 cm. These results are then applied to the new trolley height, until the height of the trolley adjusts to the body height of the workers, thereby reducing the level of worker complaints. The results obtained in this study were a reduction in complaints from 26 to 4 complaints (reduction by 84.61%).
Analisis Sifat Material SB 171 C70600 Dalam Meminimalisir Risiko Korosi Pada Tube Bundle E-3-05 A&C Pada Kilang Minyak Malau, Manuel Davinci; I Gusti Ngurah Priambadi; Didin
JURNAL RISET DAN APLIKASI TEKNIK INDUSTRI Vol. 3 No. 01 (2025): Volume 03 Issue 01, Agustus 2025
Publisher : Study Program of Industrial Engineering, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JRATI.2025.v03.i01.p14

Abstract

Penelitian ini bertujuan untuk menganalisis sifat material SB 171 C70600 dalam upaya meminimalisir risiko korosi pada komponen channel tube bundle E-3-05 A&C di kilang minyak. Pada awalnya, material SA 105 (carbon steel) direncanakan sebagai bahan fabrikasi, namun terbukti tidak cocok untuk lingkungan korosif, sehingga dipilih SB 171 C70600 sebagai pengganti. Metode yang digunakan meliputi observasi langsung, wawancara teknis, dan studi literatur terhadap spesifikasi ASME BPVC 2023. Hasil menunjukkan bahwa SB 171 C70600, yang mengandung tembaga dan nikel, memiliki ketahanan tinggi terhadap korosi, khususnya dalam lingkungan air laut, serta konduktivitas termal yang baik. Dibandingkan SA 105, SB 171 C70600 lebih unggul dari sisi ketahanan terhadap korosi, meskipun memiliki kekuatan mekanik yang lebih rendah. Pemilihan SB 171 C70600 pada bagian channel terbukti mampu menjaga efisiensi perpindahan panas, mengurangi risiko kebocoran, dan memperpanjang umur pakai komponen. Dengan demikian, penggunaan material ini sangat direkomendasikan untuk aplikasi heat exchanger yang bekerja dalam kondisi lingkungan korosif.