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All Journal Rekayasa Mesin Jurnal Ilmiah Teknik Industri Journal of Mechanical Engineering Science and Technology Jurnal Sistem Teknik Industri Engineering, Mathematics and Computer Science Journal (EMACS) Indonesian Journal of Engineering and Science (IJES)
Djoko Setyanto
Universitas Katolik Indonesia Atma Jaya
Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering

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Design of Affordable Cold Storage for Horticulture Products (Urban Farming “Mom's Farm” in Sampora Village) Ferdian Suprata; Christine Natalia; Djoko Setyanto; Budi Kartadinata; Victoria Principall
Jurnal Ilmiah Teknik Industri Vol. 21, No. 1, June 2022
Publisher : Department of Industrial Engineering Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/jiti.v21i1.13926

Abstract

Growing the world’s population to almost 9.7 billion by 2050 will continue to address the challenges facing the food and agriculture sector. The aim of this study is to reduce food losses in Sampora Village, Cisauk – South Tangerang by creating an affordable cold-storage of Modified Atmosphere Storage (MAS) equipment with a capacity of 4.77 m3 so that it can increase the quality of food for a longer period without deterioration of the horticultural products stored. Temperature control, humidity control, air circulation, maintenance of space between containers for adequate ventilation, total capacity, dimensions, efficiency, development costs, durability, performance, and features are involved in the design. This cold storage is designed with a Design Thinking method. A qualitative research was conducted through interviews to gain insight and synthesize the needs. The selection prototype concept was chosen by the Pugh Matrix and finally this study proposed in an affordable cold-storage technology.
PHYSICAL-MECHANICAL PROPERTIES OF PINEAPPLE LEAF FIBRE REINFORCED IN UNSATURATED POLYESTER RESIN FILLED WITH CALCIUM CARBONATE Rachman, Maulana; Kasda, Kasda; Komara, Achmad Moeslihat; Gunawan , Harjadi; Setyanto, Djoko
Jurnal Rekayasa Mesin Vol. 14 No. 3 (2023)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v14i3.1451

Abstract

Using natural fibres is often recommended as polymer composite materials owing to their potential to reduce the pollution of synthetic material waste. This study aimed to obtain the physical properties of unsaturated polyester resin matrix composite containing calcium carbonate fillers of 15 and 30 parts per hundred weights of the resin and natural pineapple leaf fibre of the amount 20% and 30% of the composite weight. The composite samples were three millimetres thick, with the pineapple leaf fibres arranged in one longitudinal direction. Some parameters observed included density, water absorption, response to fire, hardness, tensile strength, modulus of elasticity, and impact strength. The results showed that adding calcium carbonate filler into the matrix increased the density, water absorption, hardness, and modulus of elasticity of the composite. However, it reduced the flame propagation rate, tensile strength, and impact strength. Also, the use of pineapple leaf fibre contributed to increased water absorption, rate of flame propagation, tensile strength, modulus of elasticity, and impact strength of the composite, but it reduced the density and hardness. As these samples use economical materials, they are likely valuable for building materials that do not require high mechanical properties, especially guttering materials.
Model Formulation for Estimating Oil Extraction Rate to Measure Oil Extraction Efficiency in Palm Oil Mill M Hudori; Iskandar, Isdaryanto; Setyanto, Djoko
Jurnal Sistem Teknik Industri Vol. 25 No. 1 (2023): JSTI Volume 25 Number 1 January 2023
Publisher : TALENTA Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsti.v25i1.10596

Abstract

FFB that has high HQE and FCI will determine the OER that will be obtained at POM, so that OER can be estimated using HQE and FCI, ie by calculating the oil content in FFB and the potential for oil loss in loose fruit that is not collected in the plantation area. The purpose of this study was to formulate an OER estimation model to determine the processing efficiency of POM. This research is a qualitative and quantitative analysis research, which is a scientific study to formulate an OER estimation model based on HQE and FCI parameters which will be used as the dependent variable. Based on the results and discussion it can be concluded that OER, which is a parameter of oil palm processing performance at POM, can be estimated using a model formulation developed from HQE and FCI variables, where these variables are indicators of FFB harvesting performance in oil palm plantations.
The Potential of Ramie Fiber as Reinforcement in Calcium Carbonate-Filled Polyester Resin Matrix Composites for Roofing Applications Reinaldo, Reinaldo; Setyanto, Djoko
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 8, No 2 (2024)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um016v8i22024p363

Abstract

Polymer matrix composite roofing materials available in the Indonesian market typically consist of 30%wt chopped strand mat glass fiber embedded in unsaturated polyester resin, filled with 30 parts per hundred resin (PHR) calcium carbonate. The aim of this research is to evaluate whether natural ramie fibers can potentially replace glass fibers. In the first stage of the study, we compared three types of natural fibers abundant in Indonesia: banana stem fibers, sugarcane bagasse, and ramie. Showed that ramie fiber performed the best. Its flexural strength, flexural modulus, and impact toughness were the highest, measured at 191.57 MPa, 6691 MPa, and 0.056 J/mm², respectively. In the second stage, we produced composite material specimens with the same composition as commercial roofing materials but replaced the glass fibers with ramie fibers. Compared to the material without ramie fibers, the composite reinforced with ramie fibers shows an increase in tensile strength to 47.53 MPa from 34.62 MPa, an increase in maximum water absorption over 14 days to 3.746% from 1.145%, and an improvement in the sound transmission class to 26 dB from 23 dB. Additionally, the ramie fibers did not significantly affect the density of the composite material. However, the inclusion of ramie fibers resulted in a reduction of the elastic modulus to 1324 MPa from 1630 MPa, and a higher mass loss in the TGA examination, at 86.95% compared to 74.65%. Ramie fiber composites achieve the minimum roofing requirement of 40 MPa tensile strength, thus having the potential to replace glass fibers.
Evaluation Operational of Reduce Reuse Recycle Waste Treatment Facility (TPS 3R) in Bandung City (Case Study: TPS 3R Saling Asih and TPS 3R Hikmah) Permatasari, Arindita Dessi; Setyanto, Djoko
Engineering, MAthematics and Computer Science Journal (EMACS) Vol. 7 No. 1 (2025): EMACS
Publisher : Bina Nusantara University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21512/emacsjournal.v7i1.12694

Abstract

Waste is a problem faced by the city where currently waste is still being transported to landfill without any waste processing first. Currently, Bandung City has a waste management problem because it does not have a final disposal site (TPA) especially for waste reduction at the source and currently the waste is processed at the Sarimukti Regional Landfill, West Bandung Regency. Currently, the achievement of waste reduction in Bandung City reached 14.46% (SIPSN, 2023). The purpose of this study is to determine the operational performance of TPS3R in Bandung City as a waste treatment facility. This research was conducted at two TPS 3R in Bandung City, namely TPS 3R Saling Asih II, Maleer Village and TPS 3R Hikmah, Panjunan Village. The method in this study uses quantitative through data collection carried out on the operational conditions of TPS 3R management of 5 aspects waste management in accordance with the. Technical Guidelines for the Implementation of Reduce Reuse Recycle Waste Treatment Facility Activities (2021). From the results of this study it is known that the operational status of the management of TPS 3R Saling Asih II is in very good condition and TPS 3R Hikmah is in good condition. Optimization of TPS 3R can be done through the formation of competent community groups through various training and monitoring of operational performance of TPS 3R.
COMPARATIVE BLADES NUMBER HORIZONTAL AXIS WIND TURBINES IN PROFILE NACA 0012 USING CFD SIMULATION Sari, Dewi Puspita; Setyanto, Djoko; Simanjuntak, Rexon Harris; Barzah, Ahmad Alfarizi; Wadirin, Wadirin; Setiyo, Edi; Hermawan, Rudi
Indonesian Journal of Engineering and Science Vol. 6 No. 2 (2025): Table of Contents
Publisher : Asosiasi Peneliti Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51630/ijes.v6i2.170

Abstract

This study explores the effect of blade count on the performance of low-scale horizontal axis wind turbines (HAWT) with NACA 0012 profiles using Computational Fluid Dynamics (CFD) methods. The results show that the turbine with three blades achieves the highest efficiency, with a power coefficient (Cp) of 0.54 at a Tip-Speed Ratio (TSR) of 7, while the four-blade turbine reaches a Cp of 0.48 at a TSR of 6. The mechanical power produced by the three-blade turbine is 1,040.81 W, 28% higher than that of the four-blade turbine (927.28 W). The progressive distribution of the pitch angle in the three-blade turbine minimizes the risk of stall and flow separation. These findings suggest that fewer blades can reduce flow interference and vortex-induced losses, making it an efficient solution for the wind energy potential in Indonesia. Future research should explore geometric and material variations for further optimization.
FINITE ELEMENT NUMERICAL ANALYSIS FOR FATIGUE STRENGTH IN FSW WELDING OF ALUMINUM-5052 ALLOY Armansyah, Armansyah; Setyanto, Djoko
Indonesian Journal of Engineering and Science Vol. 6 No. 2 (2025): Table of Contents
Publisher : Asosiasi Peneliti Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51630/ijes.v6i2.177

Abstract

This study applied observations on the fatigue loads of friction stir welding joints of 5052 Aluminum alloy using the finite element method approach. The 3-dimensional model of the test specimen for fatigue loading was designed using CAD software following the ASTM E466 standard. Fatigue loads were simulated numerically using Ansys Workbench software with loading sequences of 5000 N, 10,000 N, 15,000 N, and 20,000 N. The simulation showed a significant increase in equivalent stress from about 9.44e7 Pa to 3.82e8 Pa.. Deformation increased from 0.32 mm to 1.26 mm, while equivalent static strain rose from 0.001 m/m to 0.004 m/m. The S/N curve analysis showed that fatigue life was under 500,000 cycles at loads between 10,000 and 20,000 N, and between 500,000 and 6,000,000 cycles at 5000 to 10,000 N.
Co-Authors Armansyah Armansyah Barzah, Ahmad Alfarizi Christine Natalia Dewi Puspita Sari Edi Setiyo Ferdian Suprata Gunawan , Harjadi Irfa Kodri Isdaryanto Iskandar Isdaryanto Iskandar Kartadinata, Budi Kasda, Kasda Komara, Achmad Moeslihat M Hudori Maulana Rachman Permatasari, Arindita Dessi Reinaldo, Reinaldo Rudi Hermawan Simanjuntak, Rexon Harris Victoria Principall Wadirin, Wadirin