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Yunus Nasution, Ahmad
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Usulan Perbaikan Metode Kerja Musculoskel Etal Disorders Dengan Metode Rapid Upper Limb Assessment (Rula) Untuk Mengurangi Risiko Musculoskel Etal Disorders Supriono; Yunus Nasution, Ahmad
DINAMIS Vol. 10 No. 2 (2022): Dinamis
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/dinamis.v10i2.10783

Abstract

XYZ adalah perusahaan yang berlokasi di Bitung, Kabupaten Tangerang dan memproduksi jus. Pada proses produksi khususnya pada bagian puree para pekerja banyak mengalami sakit pada bagian pinggang, leher, pergelangan tangan, lengan atas dan punggung. Tujuan penelitian ini adalah untuk mengurangi tingkat terjadinya risiko musculoskeletal disorders untuk mengetahui hasil dari metode RULA. RULA merupakan metode yang digunakan untuk menginvestigasi gangguan pada anggota bagian atas dan Nordic Body Map merupakan kuesioner sederhana untuk mengidentifikasi risiko ergonomi. Dari hasil penelitian kegiatan berisiko tinggi dan perlu tindakan sekarang juga adalah pencucian buah, pengambilan bubur buah dan penuangan bubur buah. Usulan perbaikan yang diberikan pada kegiatan pencucian buah adalah dengan menambahkan alat bantu berupa katrol. Pada kegiatan penimbangan dan penuangan bubur buah akan lebih baik jika posisi bak puree ditinggikan atau semacam diberi rak agar posisi tubuh operator tidak membungkuk.
FAILURE ANALYSIS OF BOILER SUPERHEATER PIPE BY MECHANICAL PROPERTIES TESTING AND CORROSION RATE TESTING Cholis, Nur; Yunus Nasution, Ahmad; Ariani, Farida; Pakpahan, Dion
DINAMIS Vol. 11 No. 2 (2023): Dinamis
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/dinamis.v11i2.14347

Abstract

Superheater is a subcritical boiler component that functions to reheat saturated steam at constant working pressure so that it becomes saturated steam. This study aims to (1) analyze failures in superheaters, (2) test mechanical properties of superheater pipe materials, (3) calculate corrosion rates in superheater pipes with weight loss methods, (4) provide preventive maintenance solutions to minimize superheater pipe damage. The method used in this study is a qualitative approach with the type of experimental study. The method of failure analysis in this superheater pipe is by testing mechanical properties, calculating the corrosion rate of the superheater pipe and providing maintenance solutions. The results of this study are (1) the failure that occurs in this superheater pipe is the occurrence of corrosion and leakage, (2) after heat treatment with a temperature of 8500C on the superheater pipe material, the hardness value increases to 148 BHN, the impact value also increases to 43.26 joules and the phase that occurs in this material is ferrite and pearlite which shows the specimen is increasingly tenacious, (3) the corrosion rate that occurs in the superheater pipe is 0.0489 mmpy, (4) the workable maintenance solution is hardening to increase the durability and service life of the superheater pipe. Keywords: Superheater, Noise, Mechanical Properties, Heat treatment.
Analysis of The Frame Design of Cracker Sheet Printing and Cutting Machine Using Finite Element Method Simulation Effendi, Riki; Pratama, Rikardo; Qadri, Munzir; Yunus Nasution, Ahmad
DINAMIS Vol. 12 No. 1 (2024): Dinamis
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/dinamis.v12i1.16359

Abstract

The food industry continues to evolve and faces challenges in enhancing production efficiency. One product that has garnered significant attention is crackers, which have high global demand. Manual processes involved in printing and cutting cracker sheets result in time and labor wastage, leading to production limitations and reducing the industry's competitiveness. Therefore, this research aims to analyze the design framework of a cracker sheet printing and cutting machine using finite element method simulation. The research methodology involves 3D modeling of the machine framework, selection of appropriate materials, and configuration of finite element method simulation to understand the structural behavior of the machine. The research findings identify critical areas requiring design improvements to enhance machine reliability and operational efficiency. By leveraging automatic cutting technology, this research is expected to enhance cracker production efficiency, reduce production costs, and improve the competitiveness of local food industries in the global market. Using cracker sheet printing and cutting machines, cracker production can be significantly enhanced compared to manual processes. These findings make a significant contribution to improving production efficiency and the competitiveness of the food industry.
Effect of Intake Valve Gap Adjustment Variation on Fuel Consumption in Daewoo 4dwy-30 Diesel Motorcycle Eko Julianto; Fuazen; Prayoga, Yongki; Iwan, Muhammad; Gunarto; Sarwono, Eko; Yunus Nasution, Ahmad
DINAMIS Vol. 12 No. 1 (2024): Dinamis
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/dinamis.v12i1.16369

Abstract

The valve mechanism system on a 4 stroke diesel motor functions as an opening or closing mechanism which is used as a way for air to enter the combustion chamber or as an outlet for residual combustion gases from the combustion chamber. To maximize diesel engine performance, valve clearance adjustments need to be carried out periodically. This research aims to determine the effect of variations in intake valve gap adjustment on fuel consumption on the Daewoo 4 DWY-30 diesel motorbike. This research uses experimental methods and is quantitative research, namely presenting the results of experiments in the laboratory on test objects. The research results show that there is an influence of variations in intake valve gap adjustment on fuel consumption. The highest fuel consumption is at the intake valve gap setting of 0.20 mm, and the lowest fuel consumption is at the intake valve gap setting of 0.60 mm.
Power Optimisation of Centrifugal Pumps in a 4-Storey Building Effendi, Riki; Rijal Siswanto, Ahmad; Qadri, Munzir; Hendra, Franka; Yunus Nasution, Ahmad
DINAMIS Vol. 13 No. 1 (2025): Dinamis
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/dinamis.v13i1.18837

Abstract

The optimization of water distribution systems in high-rise buildings is essential for enhancing energy efficiency and reducing operational costs. This study examines the effects of implementing a Variable Frequency Drive (VFD) on a centrifugal pump system within a four-storey high-rise building at PT SBA. A case study approach was employed to measure key operational parameters—namely, electrical power consumption, water flow rate, and pressure distribution—both before and after VFD installation. The experimental results demonstrate that the VFD application resulted in a 20% reduction in power consumption, decreasing from 3.5 kW to 2.8 kW, while the water flow rate improved by 12.5%, rising from 80 LPM to 90 LPM. In addition, the pressure range was significantly stabilized, narrowing from 1.2–2.5 bar to 1.0–2.0 bar across the building’s floors. An economic analysis based on the observed energy savings indicates an annual cost reduction of approximately Rp7,665,000, with a corresponding return on investment achieved in less than one year. The findings suggest that integrating VFD technology into centrifugal pump systems not only enhances operational efficiency and extends equipment lifespan by mitigating load fluctuations but also offers substantial economic benefits. This study provides a robust framework for the broader application of VFD-based optimization strategies in high-rise and industrial water distribution systems.
Co-Authors Eko Julianto Farida Ariani Fuazen Gunarto Hendra, Franka Iwan, Muhammad Munzir Qadri Nur Cholis Pakpahan, Dion Pratama, Rikardo Prayoga, Yongki Rijal Siswanto, Ahmad Riki Effendi Sarwono, Eko Supriono