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INDONESIA
Traksi : Majalah Ilmiah Teknik Mesin
Published by Universitas Muhammadiyah Semarang
ISSN : 16933451     EISSN : 25799738     DOI : -
Core Subject : Science, Engineering,
Energy Engineering
TRAKSI (eISSN 2579-9738 / ISSN 1693-3451) adalah Majalah Ilmiah Teknik Mesin Universitas Muhammadiyah Semarang (UNIMUS) dengan cakupan bidang material teknik, konversi energi dan manjfaktur. Jurnal ini terbit 2 kali dalam satu tahun.
Arjuna Subject : -
Articles 6 Documents
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Search results for , issue "Vol 21, No 2 (2021): TRAKSI" : 6 Documents clear
Analisis Kinerja Mesin Crimping dengan Metode Overall Equipment Effectiveness Ciptadi Tatag Tur Raharja; Deri Teguh Santoso; Rizal Hanifi; Nanang Burhan
TRAKSI Vol 21, No 2 (2021): TRAKSI
Publisher : Universitas Muhammadiyah Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26714/traksi.21.2.2021.%p

Abstract

Wire harness is one of the main components in motorized vehicles that serves to transmit electric current and signals to motorized vehicles. The crimping machine is a tool used to connect or unite cables with terminals and is also the initial stage in the wire harness production process. Based on the above background, this research is focused on the flow of the wire harness and crimping machine production process to analysed the effectiveness of their performance using the OEE (Overall Effectiveness Equipment) method. The function of this OEE method is to measure engine effectiveness based on three main ratios, namely availability, performance efficiency, and rate of product quality. The OEE method is also inseparable from the six big losses because to be able to find out where the biggest losses are in a production process. The results of the analysis that have been carried out obtained an average value of 93% availability, 98.32% performance efficiency, and 99.77% rate of product quality. The OEE value was obtained at 91.23% and the largest loss was obtained in the setup and adjustment losses section, which was 4.76%. The cause is the factor of human negligence in carrying out machine maintenance and the machine factor because the service life has exceeded the limit which causes the machine to be easily damaged.
Penerapan Reliability Centered Maintenance (RCM) Untuk Perawatan Mesin Twin Screw Extruder Sofian Bastuti; Rini Alfatiyah; Riki Effendi
TRAKSI Vol 21, No 2 (2021): TRAKSI
Publisher : Universitas Muhammadiyah Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26714/traksi.21.2.2021.%p

Abstract

The industrial sector is currently increasingly competitive and intensively developed through increasingly sophisticated technology. One of the factors supporting the effectiveness and efficiency of production is the engine, so that engine performance needs to be maximized. PT. Nirwana Internar Jaya is a company engaged in the manufacture of pipes using a twin screw extruder machine. The machine does production continuously, so it does not rule out the possibility of downtime. This study aims to determine the optimal maintenance action and determine the maintenance time interval on the twin screw extruder machine using the Reliability Centered Maintenance (RCM) method. The results obtained are that it can reduce the downtime of the twin screw extruder machine from 72.5 hours to 27.5 hours by performing maintenance on heating control system components with maintenance time intervals of 155.15 hours or 7 days, motor cooling fan 739.02 hours or 31 days and blower/fan components with maintenance intervals of 828.08 hours or 35 days. Condition monitoring measures also need to be taken to reduce disturbances that can hinder production activities.
Studi Eksperimental Desain Kontraksi Wind Tunnel Bentuk Nosel Chamber Positif & Negatif Sigit Budi Hartono
TRAKSI Vol 21, No 2 (2021): TRAKSI
Publisher : Universitas Muhammadiyah Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26714/traksi.21.2.2021.%p

Abstract

Penelitian ini membandingkan desain kontraksi wind tunnel dengan bentuk nosel chamber positif dan negative dengan beberapa parameter yang diteliti yaitu pengaruh geometri kontraksi Wind Tunnel yang berbentuk nosel chamber positif dan negatif, karakteristik medan aliran (velocity dan pressure) dari aliran, berapa nilai intensitas turbulen aliran udara. Desain Wind Tunnel pada tahap awal akan dilakukan modeling dengan simulasi komputer, yang berguna sebagai permodelan desain bentuk dan geometri yang paling baik dan optimal, dengan tinjauan berbagai aspek dan parameter aerodinamika sesuai dengan kebutuhan penelitian, sehingga bagian-bagian utama terowongan angin seperti, honey comb, kontraksi, seksi uji, diffuser dan fan isap, akan dirancang memenuhi aspek aerodinamis. Studi eksperimental dilakukan untuk melihat dan mengidentifikasi fenomena aspek aerodinamis, dengan menggunakan model nosel bentuk chamber positif dan negatif yang berukuran skalatis dan dilakukan di dalam Wind Tunnel. Ujicoba dilakukan dengan metode eksperimen pada wind tunnel  pada tiga tingkat variasi kecepatan, yaitu; kecepatan rendah 4 m/s, kecepatan sedang 8 m/s dan kecepatan tinggi 12 m/s, menggunakan visualisai gambar dan dikombinasikan dengan pengukuran data variasi kecepatan aliran udara, agar dapat menghasilkan aliran kecepatan angin pada kisaran minimum dan maksimum di bagian seksi uji Wind Tunnel (rata-rata 0,5 ~ 8 m/s). pada nilai intensitas turbulensi yang paling rendah. Hasil penelitian ini menunjukkan bahwa secara umum bentuk kontraksi nosel camber (-) memiliki performasi yang lebih baik pada kecepatan 6 m/s ke atas, karena luas area up-stream dan down stream yang sama sehingga selisih kecepatan yang dihasilkan dari kedua model uji menjadi sama, walaupun dengan nilai kecepatan hasil yang berebeda pada kecepatan input yang sama, di daerah up stream dan down stream terjadi ketidak seragaman kecepatan aliran, sehingga hasil ini menunjukan bahwa karakter aliran yang dihasilkan pada nosel (+) membentuk aliran yang tidak seragam kecepatannya dan Nosel (-) variasi kecepatan alirannya lebih seragam, ini menunjukkan bahwa karakter aliran yang dihasilkan pada nosel (-) lebih baik bila dibandingkan nosel (+).-------This study compares the design of wind tunnel contractions with positive and negative chamber nozzles with several parameters studied, namely the effect of wind tunnel contraction geometry in the form of positive and negative chamber nozzles, flow field characteristics (velocity and pressure) of the flow, what is the value of the turbulent intensity of air flow. In the early stages of the Wind Tunnel design, modeling with computer simulation will be carried out, which is useful as the best and optimal modeling of the shape and geometry design, with a review of various aspects and aerodynamic parameters according to research needs, so that the main parts of the wind tunnel such as honey comb, contraction, test section, diffuser, and suction fan, will be designed according to aerodynamic aspects, using a nozzle model of positive and negative chamber shapes with scalar size and carried out in the Wind Tunnel. The experiment was conducted using an experimental method in a wind tunnel at three levels of speed variation, namely; low speed 4 m/s, medium speed 8 m/s, and high speed 12 m/s, using image visualization and combined with measurement of airflow velocity variation data, to produce wind speed flow in the minimum and maximum range in the Wind test section. Tunnel (average 0.5 ~ 8 m/s) at the lowest turbulence intensity value. The results of this study indicate that in general, the contraction form of the chamber nozzle (-) has better performance at speeds of 6 m/s and above because the upstream and down-stream areas are the same so that the difference in velocity resulting from the two test models is the same, although with different results velocity values at the same input speed, in the upstream and downstream areas there is a non-uniform flow velocity, so this result shows that the flow character generated at the nozzle (+) forms a flow that is not uniform in speed and the nozzle (-) the variation of flow velocity is more uniform, this indicates that the flow characteristics produced at the (-) nozzle are better than the (+) nozzle.
Mempelajari Proses Produksi Wire Harness Dan Studi Kasus Serta Perawatan Pada Mesin Cheker KCM Di CV. HIJ Anantha Malden; Kardiman Kardiman; Marno Marno; Nanang Burhan
TRAKSI Vol 21, No 2 (2021): TRAKSI
Publisher : Universitas Muhammadiyah Semarang

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

Abstract

Wire harness is one of the most important components in two-wheeled and four-wheeled vehicles which functions to transmit electric current and signals to motorized vehicles. CV. HIJ is a company engaged in the automotive sector. This company produces various types of wire harnesses for several companies in Indonesia. The checker machine is a tool used to check electric currents and signals.The checker machine is a very important step in the wire harness manufacturing process.Based on the background, this research focuses on the flow of the wire harness productionprocess, the checker machine to study the repair and maintenance of the checker machine, and to find the cause and effect on the checker machine pins using the fishbone diagram method. The function of the fishbone diagram aims to find the cause andeffect of the broken pin experienced in the checker machine. The analysis uses 4 of the 6 main factors, because there are only 4 factors that affect the process of checking thewire flow. The cause of a broken pin there are 4 factors, namely: material, machine, method, and human. Of the 4 factors that affect pin pata the most, humans are caused by lack of training and poor behavior at work.Checker machine at CV. HIJ has 10 preventive daily maintenance or preventive maintenance. Preventive maintenance at the company has not been used optimally and there is an additional point according to the author, namely how to enter the pin correctly.Aims to minimize damage to the checker machine.
Rancang Bangun Turbin Mikrohidro sebagai Pembangkit Listrik di Curug Muncar Fandhy Angga Pradana
TRAKSI Vol 21, No 2 (2021): TRAKSI
Publisher : Universitas Muhammadiyah Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26714/traksi.21.2.2021.%p

Abstract

Mikrohidro merupakan pembangkit listrik berskala kecil, yang memanfaatkan aliran sungai kecil atau irigasi. Mikrohidro juga termasuk sumber daya terbarukan dan layak disebut Clean Energy, karena ramah lingkungan,energy terbarukan yang dapat di kembangkan dan memanfaatkan aliran air yang ada di sekitar pedesaan.Pembangkit Mikrohidro selalu memanfaatkan potensi ketinggian air tertentu (head).kemudian di konversikan menjadi energi litrik melalui turbin dan generator sehingga muncul presepsi bahwa air mengalir dengan ketinggian sangat rendah tidak dapat digunakan Mikrohidro penelitian ini menggunakan sudu setengah lingkaran penelitian ini memahami laju air serta putaran kincir menganalisa listrik yang di dapat dari generator tersebut. Peneliti akan menulis dan mengetahui daya yang di hasilkan dari generator listrik. Kata Kunci : Rancang Bangun, mikrohidro, daya, listrik
Optimalisasi Proses Kerja Mesin Crimping Di CV. XYZ Daffa Risaldi
TRAKSI Vol 21, No 2 (2021): TRAKSI
Publisher : Universitas Muhammadiyah Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26714/traksi.21.2.2021.%p

Abstract

Peningkatkan produktivitas sangat penting bagi perusahaan untuk mendapatkan keberhasilan pada proses usahanya. Dimana salah satu contoh peningkatan produktivitas adalah dengan proses produksi pada suatu perusahaan . CV. XYZ memiliki mesin crimping berjumlah 3 buah dan sering mengalami down time. Faktor yang mempengaruhi produktivitas mesin crimping adalah Availability, Performance Rate, dan Quality Rate. Penelitian ini bertujuan untuk mengevaluasi optimasi dan perbaikan pemeliharaan tiga buah mesin crimping. Metode yang digunakan adalah mencari nilai dari Overall Equipment Effectivitness, lalu menganalisa Down Time untuk mengetahui factor-faktor penyebabnya. Hasil penelitian ini didapatkan nilai Overall Equipment Effectivitness selama 7 hari sebesar 62,51% dan fokus penyebab Down Time adalah factor mesin dan manusia. Dengan diadakan penelitian ini, peneliti ini berharap dapat memberikan refrensi rinci bagi CV. XYZ untuk melakukan perbaikan ataupun inovasi kedepannya terkait prosuktivitas produksi.

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