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Timotius Anggit Kristiawan
Politeknik Negeri Semarang
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Journal : Journal of Mechanical Engineering and Applied Technology

 1 
The Influence Of Using A Sleeve Machine On The Production Cost Of Brake Shoe Products In The Die Casting Department Of PT XYZ Timotius Anggit Kristiawan; Andryana Dwiandara Wibowo; Trio Setiyawan; Ragil Tri Indrawati
Journal of Mechanical Engineering and Applied Technology Vol 2, No 1 (2024): VOLUME 2 ISSUE 1 YEAR 2024 (MARCH 2024)
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jmeat.v2i1.5475

Abstract

The process of finishing brake shoe products in PT XYZ's die casting department experienced waste using M steel shot 230 sand which reached 4,125 kg throughout 2020 and the amount of sand that fell to the floor was 36 kg per shift. The reason is that the unloading process is still manual by shaking the brake shoe jig for 2 seconds/jig then immediately pouring the brake shoe into the polybox which has holes and does not have a sand container. The use of a sieving machine is expected to reduce lost sand so that productivity can increase. The test parameters are the rotation of the motor which is regulated through an inverter of 5.5 Hz, 6 Hz, and 6.5 Hz for the time of the brake shoe sifting process, as well as the amount of sand scattered and carried by the brake shoe against the cost of purchasing sand. The results showed that productivity increased by 5.56%, the cost down of purchasing sand by up to 75.40%, and environmental cleanliness increased by 92.87%. The increase above based on Pareto analysis is included in the significant category because it meets the 20/80 rule.
Mass Ratio Influence on Vortex-Induced Vibration of a Flexible Cylinder using Large Eddy Simulation at Re=1000 Avicenna An-Nizhami; Nanang Apriandi; Trio Setiawan; Timotius Anggit Kristiawan; Elfrida Rizky Riadini; Atikah Ayu Janitra; Padang Yanuar
Journal of Mechanical Engineering and Applied Technology Vol 2, No 1 (2024): VOLUME 2 ISSUE 1 YEAR 2024 (MARCH 2024)
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jmeat.v2i1.5498

Abstract

The study investigates the phenomenon of vortex-induced vibration (VIV) using Large Eddy Simulation (LES) at a Reynolds number of 1000, focusing on transitional flow conditions. LES has proven effective in understanding VIV across Reynolds number regimes, aiding in comprehending flow physics and mechanisms behind VIV. The research aims to contribute data for validating numerical models and informing engineering practices. The study employs the Navier-Stokes equation and the continuity equation to analyze fluid flow, treating it as incompressible due to negligible density changes. The three-dimensional incompressible momentum equation is discretized using the finite volume method within the spatial domain. Resolution of the pressure Poisson equation ensures compliance with free divergence conditions, enhancing computational fluid dynamics simulations' reliability. Validation of the fluid flow solver involves comparing computed drag force coefficients with established benchmarks, showing agreement within small discrepancies. The study delves into vibration behavior induced by cross flow at various reduced velocities (), noting distinct patterns ranging from irregularities at low  to quasi-periodic behavior at higher values. Analysis of maximum cylinder displacement () across different reduced velocities and mass ratios underscores the complex relationship between system parameters and displacement dynamics. A consistent occurrence of y_max at a specific reduced velocity highlights its significance, while varying mass ratios affect displacement patterns, indicating the importance of understanding these dynamics for optimizing fluid-structure interaction systems.
Rancang Bangun dan Analisis Screen Cutting Machine Guna Meningkatkan Produktivitas Pemotongan Timotius Anggit Kristiawan; Alfiando Satrio Wibowo; Arif Hidayat
Journal of Mechanical Engineering and Applied Technology Vol 1, No 1 (2023): Volume 1 Issue 1 Year 2023 (March 2023)
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jmeat.v1i1.4720

Abstract

The material cutting process can be done with a variety of mechanical power options that can be used, ranging from manual cutting methods that require manual skills, to semi-automatic and automatic cutting that utilize advanced technology to increase efficiency and accuracy. The process of cutting materials at PT Suri Tani Pemuka is still done manually, by relying on the skills of the workers' hands. The impact resulting from the manual cutting process is that the cutting results are not according to the standard size determined by the company, so that there are still many NG products found from the cutting process. Based on these problems, it is necessary to have a solution, namely by designing a screen cutting machine to increase cutting productivity. The methods used in this research include Identification of need, Definition of problem, Synthesis, Analysis and Optimization, Evaluation, and Presentation. The test was carried out to test the quality of the screen cut results. The results obtained from this study are screen cutting machines for cutting screen equipment with an increase in the percentage of successful screen cutting by 33.3% from 50% to 83.3%.
DESIGN AND PERFORMANCE TEST OF A CABINET TYPE DRYER FOR DRYING BREADFRUIT CHIPS: A CASE STUDY OF THE SUMBER REJEKI PURWOSARI FARMERS GROUP, SEMARANG CITY Nanang Apriandi; Timotius Anggit Kristiawan; Yusuf Dewantoro Herlambang; Supandi Supandi; Zainal Abidin; Andryana Dwiandara Wibowo
Journal of Mechanical Engineering and Applied Technology Vol 1, No 3 (2023): Volume 1 Issue 3 Year 2023 (November 2023)
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jmeat.v1i3.5112

Abstract

This study aims to design and build a cabinet-type breadfruit chips dryer powered by liquefied petroleum gas (LPG) and to assess the dryer's characteristics, particularly by observing the temperature and relative humidity (RH) variables in the drying chamber. This characteristic data is critical for forecasting the dryer's ability during drying. The experimental approach was carried out in three stages: design, assembly, and testing without a drying load under two process conditions, charging and discharging. The testing time is 150 minutes, with the charging procedure taking 70 minutes and the discharging process taking 80 minutes. In general, the distribution of temperature and RH on each shelf in the drying chamber is consistent, both during the charging and discharging processes. In the charging-discharging process, the average temperature of the drying room is 45.39 C with a RH of 40.99%, while the plenum room average temperature is 77.02 C.
Rancang Bangun Tank Erection Manual Jacks pada Proyek Pembongkaran Tangki CPO 13 Ton di PT Domus Jaya Lampung : Studi Kasus Efisiensi Biaya Zainal Abidin; Timotius Anggit Kristiawan; Muhajid Syafiulhaq Faza
Journal of Mechanical Engineering and Applied Technology Vol 1, No 3 (2023): Volume 1 Issue 3 Year 2023 (November 2023)
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jmeat.v1i3.5202

Abstract

AbstrakPT Domus Jaya Lampung merupakan perusahaan yang bergerak dibidang refineri dan fraksinasi minyak kelapa sawit di Lampung Selatan dan merupakan salah satu supplier minyak nabati yang berkualitas untuk kebutuhan ekspor dan lokal. Pada tahap perencanaan pembongkaran tangki terdapat permasalahan, permasalahannya yaitu tidak memungkinkannya penggunaan crane dalam proses pembongkaran tangki. Penyebabnya adalah biaya penyewaan crane yang cukup mahal sehingga mengakibatkan perusahaan akan mengeluarkan biaya yang cukup besar untuk proyek pembongkaran tangki, kemudian penyebab berikutnya yaitu area penempatan tangki yang cukup sempit dan padat oleh saluran perpipaan sehingga crane tidak dapat beroperasi pada area tersebut. Tujuan dari penelitian ini adalah membuat rancang bangun tank erection manual jacks guna memberikan fleksibilitas penggunaan alat dan efisiensi biaya dalam proyek pembongkaran tangki. Metode penilitian meliputi identifikasi masalah, perumusan masalah, identifikasi akar masalah, tindakan korektif dan pemantauan sistem. Hasil penelitian yaitu rancang bangun tank erection manual jacks sebagai alat bantu pengganti crane pada proyek pembongkaran tangki dengan kemampuan beban angkat mencapai 20 Ton dengan fleksibel pada area-area sempit dan dapat menurunkan biaya pengeluaran sebesar 63% pada proyek pembongkaran tangki.
Rancang Bangun dan Analisis Variasi Kecepatan Putaran Welding Rotary Table Pada Proses Pengelasan Stub Shaft Guna Meningkatkan Kualitas Hasil Pengelasan: Studi Kasus di PT. X Indonesia Susanto, Arif; Kristiawan, Timotius Anggit; Harmanto, Sri
Journal of Mechanical Engineering and Applied Technology Vol 2, No 2 (2024): VOLUME 2 ISSUE 2 YEAR 2024 (JULY 2024)
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jmeat.v2i2.5756

Abstract

Proses pengelasan stub shaft di PT X Indonesia masih menggunakan meja manual tidak berputar, sehingga berakibat pada  hasil  pengelasan  stub  shaft  yang  berbentuk  oval,  dengan  begitu  mengharuskan  operator  welder  melakukan penambahan pengelasan yaitu 4-6 kali pengelasan memutar supaya hasil pengelasan berbentuk sesuai apa yang sudah ditentukan. Oleh karena itu, penelitian tentang rancang bangun dan analisis variasi kecepatan putaran welding rotary table pada proses pengelasan stub shaft guna meningkatkan kualitas hasil pengelasan sangat penting dilakukan. Tujuan penelitian  ini  adalah  mempercepat  proses  pengelasan,  Melakukan  analisa  kecepatan  normal  yang  diperlukan  untuk melakukan pengelasan stub shaft, dan meningkatkan kualitas hasil pengelasan dengan membuat welding rotary table sebagai alat bantu dalam melakukan stub shaft. menggunakan motor listrik 0,5 Hp 1380 Rpm dan kontrol kecepatan menggunakan  inverter  ATV310.  Metode  yang  digunakan  untuk  merancang  bangun  welding  rotary  table  yaitu Identification  of  need,  Definition  of  problem,  Synthesis,  Analysis  and  Optimization,  Evaluation,  dan  Preparation. Pengujian  pengelasan  stub  shaft  menggunakan  welding  rotary  table  dilakukan  pada  shaft  Ø100  dan  Ø125.  Hasil menunjukkan pengelasan pada layer 1 paling baik jika digunakan pada frequensi 7,6-7,1 Hz atau 2,28-2,3 rpm. Pada layer  2  paling  baik  jika  digunakan  frequensi  7-5,3  Hz  atau  2,1-1,59  rpm.  Pada  layer  3  paling  baik  jika  digunakan frequensi 4,1-3,4 Hz atau 1,23-1,02 rpm. Pada layer 4 paling baik jika digunakan frequensi 3,1-2,7 Hz atau 0,93-0,81 rpm.  Pada  layer  5  paling  baik  jika  digunakan  frequensi  2,4-2,1  Hz  atau  0,72-0,63  rpm.  Pada  layer  6  paling  baik digunakan  frequensi  2,2-2  Hz  atau  0,66-0,6  rpm.  Rata-rata  waktu  yang  diperlukan  untuk  pengelasan  stub  shaft menggunakan alat welding rotary table yaitu berkisar 10-11 menit.
Front Matter Journal of Mechanical Engineering and Applied Technology, 2 (2) July 2024 Kristiawan, Timotius Anggit
Journal of Mechanical Engineering and Applied Technology Vol 2, No 2 (2024): VOLUME 2 ISSUE 2 YEAR 2024 (JULY 2024)
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jmeat.v2i2.5766

Abstract

Co-Authors Achmad, Fariz Ahmad Dimas Alisyafa'at Alfiando Satrio Wibowo Alisyafa’at, Ahmad Dhimas Aminuyati An Nizhami, Avicenna Andryana Dwiandara Wibowo Andryana Dwiandara Wibowo Ardjo, Anwar Sukito Arif Hidayat Atikah Ayu Janitra Aulia, Nur Fatowil Budhi Prasetiyo Dwiana Hendrawati Elfrida Rizky Riadini Farika Tono Putri Hery Tristijanto Ignatius Gunawan Widodo Janitra, Atikah Ayu Karuana, Muhammad Rienaldy Muhajid Syafiulhaq Faza Mulyono Mulyono Nanang Apriandi Nizami, Avicenna An Nurhidayati Nurhidayati Padang Yanuar Padang Yanuar Panji Setya Laksono Ragil Tri Indrawati Rani Raharjanti Riles Melvy Wattimena Riles Melvy Wattimena Rizal Ma’ruf Rizkha Ajeng Rochmatika Safriana, Eni Satito, Aryo Setiyawan, Trio Sri Harmanto Sri Harmanto Sugeng Irianto Supandi Supandi Suwarti Suwarti Trio Setiawan Trio Setiyawan Trio Setiyawan Tristan Yusuf Annas Tristan Yusuf Annas Wahyono Wahyono Wahyu Isti Nugroho Wibowo, Andryana Dwiandara Widodo, Ignatius Gunawan Wiwik Purwati Widyaningsih Yanuar Mahfudz Safarudin Yusuf Dewantoro Herlambang Zaenal Abidin Zainal Abidin