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OPSI
Published by Universitas Pembangunan Nasional Veteran Yogyakarta
ISSN : 16932102     EISSN : 26862352     DOI : https://doi.org/10.31315/opsi
Core Subject : Engineering,
Industrial & Manufacturing Engineering
Jurnal OPSI adalah Jurnal Optimasi Sistem Industri yang diterbitkan oleh Jurusan Teknik Industri UPN “Veteran” Yogyakarta sebagai wahana publikasi hasil karya ilmiah, penelitian rekayasa teknologi di bidang Teknik Industri, Sistem Industri, Manajemen Industri dan Teknologi Informasi.
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Articles 255 Documents
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Increasing Overall Equipment Effectiveness in the Computer Numerical Control Lathe Machines using the Total Productive Maintenance Approach Tri Ngudi Wiyatno; Hibarkah Kurnia
OPSI Vol 15, No 2 (2022): ISSN 1693-2102
Publisher : Jurusan Teknik Industri Fakultas Teknologi Industri UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/opsi.v15i1.7284

Abstract

Production machines are the most important part of a production system. Machines need effective and efficient maintenance to be able to guarantee and support the production process to run well. The steel industry is an industry that produces various types and shapes of steel with one of the machines being Computer Numerical Control (CNC) type BT-A16. These machines often have problems such as downtime that interfere with the production experience. The purpose of this research is to find out the problems in the CNC BT-A16 production machine and provide recommendations for improvements to improve machine performance or Overall Equipment Effectiveness (OEE). The approach used is Total Productive Maintenance by calculating the OEE value. Problem analysis was carried out through Focus Group Discussion with expert judgment when determining the Failure Mode Effect Analysis (FMEA) analysis. Research findings indicate that the cause of the engine is not optimal comes from abnormal heat in the gearbox and machine spindle components caused by operator error when inputting data. The definite improvement is making a special schedule for maintenance, checking all maintenance schedules, and conducting training to increase knowledge and skills. The results of the corrective action show an increase in the OEE value from 70.8% to 79.9% or an increase of 9.1%, so the increase in the OEE value will increase the efficiency of the BT-A16 CNC lathe.
Redesain Cold Heading Dies Melalui Pendekatan Metode FMEA dan DFM di PT. ZYX Deni Setiawan; Annisa Indah Pratiwi; Amelia Nur Feriza
OPSI Vol 15, No 2 (2022): ISSN 1693-2102
Publisher : Jurusan Teknik Industri Fakultas Teknologi Industri UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/opsi.v15i2.7635

Abstract

PT. ZYX is a foreign company automotive component sector for four-wheeled vehicles. In their third year of mass production, the production capacity reached 116 million pcs, resulting in the high cost of Dies purchase for Cold Heading machines. This condition worsened because things such as Dies having a low lifetime and the lead time for Dies purchasement is in the range of 20-40 days or more, which has the potential to cause machine downtime. This study aims to redesign the Dies of Cold Heading machine used today. Completion of the design uses the Pareto diagram analysis, FMEA, and DFM. The analysis result using the FMEA method shows the highest RPN value of 336 with the potential for insert carbide failure that cracks during assembly. The recommended corrective action is to make assembly support components, namely pokayoke parts, and make work instructions for replacing carbide inserts on Dies. The analysis results using the DFM method shows a change in term of cost. The cost for 1 unit of Dies purchasement was initially Rp. 10,247,113.00, but it dwindles to Rp. 4,623,914.23. Using the redesign to make case dies, lock nuts, collets, and stoppers components, resulted in cost efficiency of 54.87%.
Proposed Design of Assistant Tools to Reduce the Risk of Disorders (MSDS) Operator of Weaving Work Station CV XYZ Panji Yudha Pratama; Nora Azmi; Indah Permata Sari
OPSI Vol 15, No 2 (2022): ISSN 1693-2102
Publisher : Jurusan Teknik Industri Fakultas Teknologi Industri UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/opsi.v15i2.7724

Abstract

The weaving operator of CV XYZ has an unergonomic work posture with a bent back and unbalanced legs at work. This non-ergonomic condition was identified by using the Nordic Body Map questionnaire to find out complaints on 28 body parts of three operators. From the identification of weaving operators using a nordic body map, it is known that there are complaints on the back, waist, and hips of the body. Identification using the Rapid Entire Body Assessment method shows that the final result of the assessment is 11, which means that there is a need for improvement now on the operator's work posture. The results of the QEC method show an exposure score of 97.12% for operator 3 and the action that must be taken is research and changes now. To reduce the risk of high work posture, a proposal for improving the working posture of the weaving machine set up operator was formulated by designing a manual scissor lift tool. In the process of designing tools, Indonesian anthropometric data is needed. The stages of designing tools are identifying operator needs, conceptualizing tools using a need metric matrix, selecting tools concepts with combination tables and scoring concepts and describing the design of tools using AutoCAD and CATIA software. From the results of the selection of several alternative concepts, a tool in the form of a manual scissor lift was chosen which has a combination of elements, namely a square working platform design, using 2 hydraulics and raw materials made of steel. Meanwhile, the manual scissor lift specification has a maximum height of 85 cm, a footing length of 70 cm and a footing width of 46 cm. It is known that before the proposed improvement, the final result of the REBA score was 11 and after the improvement the final result of the REBA score was 4 which indicates that the operator's work posture has improved after using the assistive device, especially in the arms, legs and back of the operator
Fuzzy Production Inventory Model considering Imperfect Quality and Shortage: A Case Study in a Goat Milk SMEs Puryani Puryani; Laila Nafisah; Nuansa Indriya Pramasthi; Apriani Soepardi; Mohammad Chaeron
OPSI Vol 15, No 2 (2022): ISSN 1693-2102
Publisher : Jurusan Teknik Industri Fakultas Teknologi Industri UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/opsi.v15i2.7574

Abstract

Goat milk powder is one of the perishable processed products. The decreasing quality of goat milk powder can cause financial losses to the company if not regulated properly. So far, the company is also faced with the problem of consumer demand uncertainty. When demand for powdered goat's milk is high, the company experiences stockout but can be overcome by backorder. When demand is low, there will be overstock. Overstock conditions, in addition to causing high holding costs, are also at risk of product quality degradation or expiration. In this study, an inventory model of goat milk powder was developed that considers the uncertainty of demand, product quality, and backorder to determine the optimal production quantity so that the total inventory cost incurred is minimum. The basic model used is economic production quantity. Uncertainty in demand and the percentage of products declining in quality is approached using a triangular fuzzy. While the defuzzification technique used is signed distance.
Feasibility Analysis of Establishing a Folding Dacron Mattress Business at Home Industry Puhpelem Wonogiri Darsini Darsini; Asrori Asrori; Marwahyudi Marwahyudi
OPSI Vol 15, No 2 (2022): ISSN 1693-2102
Publisher : Jurusan Teknik Industri Fakultas Teknologi Industri UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/opsi.v15i2.5395

Abstract

The establishment of home industries needs to be assessed for initial efforts to see whether the enterprise is worthy to establish or not. The study aims to learn the worthiness of the dacron bed business Pure Plembang Puhpelem, Wonogiri from non-financial and financial analyzed by the Payback Period (PP), Net Present Value (NPV), Net Benefit-Cost Ratio (Net B/C), and the Internal Rate of Return (IRR). The study is qualitative-quantitative. The research subject is the home industrial bed Pure Plembang Puhpelem, Wonogiri with the dacron tree-worthy research object. Research indicates that (1) Due to market and marketing aspects, the dacron bed was more deserving because the monthly demand in each region had met its monthly target of production, (2) From the technical aspects of the dacron bed business, it was worth running, due to the location close to the existing labor and salary, (3) From the environmental aspect of the environment, the dacron is worth running because it can help the economy around the shop and is scant, and (4) From the financial aspect, with Capital Budgeting obtained PP over 5 Years 3 Months shorter than 10-year investment, NPV Rp 39,553,430 where NPV > 0, Net B/C is acquired 1.22 > 1, and IRR is 14% greater than the current interest rate (DF) at 9%. From these results, it is concluded that the financial aspect is worthy of execution.
Application of Good Logistics Practices to Export-Oriented SMEs through Export Regulation Applications Miftahol Arifin; Ratih Windu Arini; Bachtiar Herdianto; Kania Putri Muliate
OPSI Vol 15, No 2 (2022): ISSN 1693-2102
Publisher : Jurusan Teknik Industri Fakultas Teknologi Industri UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/opsi.v15i2.8242

Abstract

In penetrating exports, SME players are often faced with obstacles such as their unpreparedness in preparing the documents needed for exports. This problem is a classic problem considering that the ability to prepare export documents is a way to export successfully. Also, SME actors need to implement Good Logistic Practices (GLP) such as product processing activities, packaging, storage and shipping management to become resilient SMEs in line with the increasing understanding of export documents.  The approach used in this study is quantitative research methods with a study survey approach and normative empirical studies. Data analysis uses a correlation approach between variables. This study used data from 210 SMSs in the KUB Cilongok, with a sample of 71 respondents. The results of the study showed that 71.5% of SME players in penetrating the export market were still constrained in understanding export documents. So to achieve export capability, it is necessary to create a comfortable and balanced supply chain
Production Process Improvement Design to Eliminate Waste in 428H Chain Products Using Lean Manufacturing at PT ABC Sekar Aulia Putri; Amal Witonohadi; Annisa Dewi Akbari
OPSI Vol 15, No 2 (2022): ISSN 1693-2102
Publisher : Jurusan Teknik Industri Fakultas Teknologi Industri UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/opsi.v15i2.7714

Abstract

PT ABC is a manufacturing company that produces several types of chains in large quantities, and one type of chain that is the main focus of this research is the 428H chain. The obstacle faced in producing the 428H Chain is not achieving the production target from June to July, and September to November 2021. The research focuses on minimizing manufacturing lead time using lean manufacturing by eliminating waste in the 428H Chain production process. Waste elimination is done by providing suggestions for improvements based on the identified waste types. The study begins with the calculation of the time sample, then MLT, PCE, the use of the Waste Assessment Model, and mapping current value stream mapping. The initial MLT was 832.95 minutes and PCE was 63.37%. WAM produces the highest percentage of waste in the type of defect, then motion, inventory, waiting, overproduction, motion, and process. The proposed improvements are in the form of designing SOP Operators on Pressing machines, adding Small Incline Belt Conveyor tools, designing SOPs for Activities in the WIP Area, and adding Manual Hand Stacker tools. The provision of improvement proposals resulted in MLT decreasing 12% to 733.2174 minutes and PCE increasing 8.6% to 71.98%, and the production target was achieved with total production per month increasing by 12%, from 21,783 to 24,746 units per month.
Application of The Triple Layered Business Model Canvas in Corporate Social Responsibility: Systematic Literature Review Inggitana Widya Kumala Putri; Tiena Gustina Amran; Dadang Surjasa
OPSI Vol 16, No 1 (2023): ISSN 1693-2102
Publisher : Jurusan Teknik Industri Fakultas Teknologi Industri UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/opsi.v16i1.8379

Abstract

The coronavirus (COVID-19) pandemic is still a main concern for various levels of society. Changes in people's lifestyles have triggered companies to switch to the right new business strategies to control their businesses during the COVID-19 pandemic. The unemployment rate, which increased by 7.07 percent due to the pandemic, needs to be suppressed by opening new jobs. The Triple Layered Business Model Canvas (TLBMC) is a method that can be used by Corporate Social Responsibility (CSR) to collaborate with the surrounding community in improving their quality of life during the pandemic. This research was conducted to identify the development of the TLBMC method, which can be obtained from literature studies from 2016 to 2022. The method used in this study is the Systematic Literature Review (SLR). This study uses the Exponential Comparison Method (MPE) to minimize bias in assessing the quality of the selected literature. The results showed that from 27 pieces of literature, nine top-selected literature with total scores above 5019 points could support research on applying TLBMC in CSR. This study found the importance of CSR collaboration with the community in restoring the economic cycle in the midst of the COVID-19 pandemic with the support of the TLBMC method.
A Model for Robot Arm Pattern Identification using K-Means Clustering and Multi-Layer Perceptron Anas Saifurrahman
OPSI Vol 16, No 1 (2023): ISSN 1693-2102
Publisher : Jurusan Teknik Industri Fakultas Teknologi Industri UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/opsi.v16i1.9004

Abstract

Predictive maintenance of industrial machines is one of the challenging applications in Industry 4.0. This paper presents a comprehensive methodology to identify robot arm (SCARA) movement patterns to detect the mechanical aging of the robot, which is determined by the abnormal movement of the robot arm. The dataset used is two robot arm movements that go from point A to B and then back to point A. Accelerometer data is used to measure the signal of SCARA actions, mainly focus on the non-linear movement. The identification of the movement pattern of the robot arm is made by combining k-means and multilayer perceptron. The proposed approach first extracts valuable features as characteristics of the two datasets from the time domain statistical value parameters. K-means clustering technique is initiated to label the training dataset. In this phase, the elbow curve is used to determine the number of clusters in the dataset, which is 2 clusters. Moreover, the assumption is used to determine which cluster is labeled as a normal and abnormal movement.  Hence, a multilayer perceptron approach is proposed to predict the testing dataset. The proposed multilayer perceptron model yields an accuracy of 94.14%, whereas its cross-validation yields an accuracy of 96.12%.
Line Balancing Model Analysis in Improving Production Line Efficiency Case Study: PT XYZ Dika Restu Elyuda; Wildanul Isnaini; Halwa Annisa Khoiri
OPSI Vol 16, No 1 (2023): ISSN 1693-2102
Publisher : Jurusan Teknik Industri Fakultas Teknologi Industri UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/opsi.v16i1.7531

Abstract

The production line system is an important problem for the majority of manufacturing industries in Indonesia. PT XYZ is manufacturing company focuses on general construction and mining products supplier. Friction Bolt Stabilizer is one PT XYZ’s superior products. The problem in the friction bolt stabilizer production line is unbalanced distribution of work elements. Based on these problems, in this study a solution is provided by comparing the actual production line with the results of line balancing analysis. There are two methods used, namely Ranked Positional Weight and Killbridge Western Heuristic. The result is that the Killbridge western heuristic method produces the best design with a performance level of 91% line efficiency, 9% balance delay, a total of four workstations and a smoothness index value of 401.55 seconds. 

Page 15 of 26 | Total Record : 255

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