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Sirait, Ganda
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RANCANGAN ALAT PEMBANGKIT LISTRIK TENAGA BATERAI Hutapea, Bitson Nerpandi; Sirait, Ganda
Computer Science and Industrial Engineering Vol 9 No 8 (2023): Comasie
Publisher : LPPM Universitas Putera Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33884/comasiejournal.v9i8.7992

Abstract

Many factors could affect electricity distribution to seclusion places or the outer part of an island that needs electricity, for instance the power plant center is located very far away, low population, and difficult access to electricity. This is a design to establish a battery power generator that has the same concept with a common generator that could result in electricity power up to 36 kWh, this power can supply electricity to 30 houses with 1,2 kWh for each house. The goal of this research is to re-designing a generator by considering user needs. A survey had been made to acknowledge what customers might need from this product and axiomatic design is used to compile a parameter design using mapping process from customer attribute and functional requirement.
PEMODELAN SISTEM DINAMIS PRODUKSI KERIPIK KENTANG PADA HOME INDUSTRI DAPUR SI NYONYONG Ilham, Muhammad; Sirait, Ganda
Computer Science and Industrial Engineering Vol 10 No 1 (2024): Comasie
Publisher : LPPM Universitas Putera Batam

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Abstract

Dapur si Nyonyong is one of the home industries located in Padang City, engaged in the production of ready-to-eat snacks, particularly potato chips. The production system applied is a make-to-order production system. The fluctuating and uncertain customer demand in each ordering period requires Dapur si Nyonyong to be able to fulfill customer requests to produce potato chips according to the quantity demanded by customers. In this study, a dynamic system modeling of potato chips production is conducted to identify the interacting variables in the dynamic potato chips production process at Dapur si Nyonyong and analyze the potato chips production system's impact on the raw material requirements. The modeling is carried out using Vensim software. The results obtained are as follows: 1. The dynamic system model of potato chips production at Dapur si Nyonyong consists of interconnected variables. The factors that build the model include the customer demand subsystem, raw material subsystem, production subsystem, and cost and revenue subsystem. 2. Based on the simulation results for the next 2 years, potato chips production will increase by 33%. However, with a monthly raw material inventory of only 20 kg, production delays are expected due to the demand for production that exceeds the available inventory. The cost for raw material requirements also increases by 33%.
RANCANG ULANG MESIN PENCETAK BATAKO PADA PT BODEM MAS JAYA Saputro, Joko; Sirait, Ganda
Computer Science and Industrial Engineering Vol 12 No 2 (2025): Comasie Vol 12 No 2
Publisher : LPPM Universitas Putera Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33884/comasiejournal.v12i2.9770

Abstract

PT Bodem Mas Jaya is a company engaged in concrete block production. However, the company faces challenges in meeting production targets due to the limitations of its block-making machine, which can only produce two blocks per process. This study aims to redesign the block-making machine to improve efficiency and production capacity. Kansei Engineering was applied to identify user needs, resulting in 16 Kansei words such as ergonomic, productive, precise, and modern. The redesign features a four-mold system, enabling the machine to produce four blocks simultaneously, doubling production capacity. Additional features such as rubber barriers, tray holders, and mold lifters enhance stability, minimize material waste, and maintain block quality. The new design also emphasizes ease of maintenance, safety, and operational efficiency. With this redesign, the company is expected to meet the increasing market demand effectively.
ANALISIS PRODUCTIVE MAINTENANCE PADA MESIN WELDING POLARIS DI PT EXCELITAS Firmansyah, Ikhsan; Sirait, Ganda
Computer Science and Industrial Engineering Vol 12 No 3 (2025): Comasie Vol 12 No 3
Publisher : LPPM Universitas Putera Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33884/comasiejournal.v12i3.9800

Abstract

This study aims to analyze the performance of the Polaris Welding machine at PT Excelitas using the Mean Time Between Failure (MTBF), Mean Time To Repair (MTTR), and Overall Availability methods. The Polaris Welding machine often experiences downtime, so that productivity is disrupted. The results of the study showed an average MTBF value of 3.24 hours, MTTR of 0.55 hours, and overall availability of 84.66%, which is still below the global standard (≥ 90%). The main causal factors are lack of operator training, unscheduled machine maintenance, and material mismatch. To improve machine performance, planned maintenance standards and autonomous maintenance are recommended. This approach is expected to minimize downtime and increase the effectiveness of the production process at PT Excelitas.
ANALISIS PENERAPAN 5S PROSES PRODUKSI PADA UKM KERUPUK LATANSA Wulandari Ramadhani, Ringgie; Sirait, Ganda
Computer Science and Industrial Engineering Vol 12 No 4 (2025): Comasie Vol 12 No 4
Publisher : LPPM Universitas Putera Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33884/comasiejournal.v12i4.9874

Abstract

UKM Kerupuk Latansa in Batam faces various challenges in its production process, including disorganized tool and material placement, a suboptimal working environment, and inefficient production time. These issues potentially lower productivity and product quality. This study applies the 5S method (Seiri, Seiton, Seiso, Seiketsu, and Shitsuke) to improve production efficiency and workplace organization. A quantitative approach was used, collecting data through direct observations, interviews, and work time measurements. The results show that after implementing 5S, the average cycle time decreased from 15.37 seconds to 13.82 seconds, and production output increased from 2,250 to 2,500 packs per month. In the Seiri stage, unnecessary items were removed from the workspace to create a cleaner and more comfortable working environment. Seiton was implemented by organizing production tools, such as impulse sealers, for easier access. Seiso involved routine cleaning of the workspace and equipment to prevent packaging defects. Seiketsu ensured standardized procedures for workplace cleanliness and organization. Finally, Shitsuke established a culture of discipline in maintaining cleanliness and order, with regular evaluations to sustain the 5S implementation. With a cleaner and more organized environment, employee comfort and productivity significantly improved.
ANALISIS PEMILIHAN SUPPLIER SPAREPART MOTOR PADA BENGKEL CV. AGUS MOTOR BATAM Sirait, Ripaldo; Sirait, Ganda
Computer Science and Industrial Engineering Vol 12 No 4 (2025): Comasie Vol 12 No 4
Publisher : LPPM Universitas Putera Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33884/comasiejournal.v12i4.9881

Abstract

Suppliers play an important role in providing quality products and in ensuring the availability of goods needed by the company. Supplier selection is a critical activity because the supplier will supply the company's raw materials in the long term so that it has a significant impact on the company's productivity. CV. Agus Motor is a motorcycle repair shop. The problems that often occur in CV. Agus Motor repair shops are delivery time, inconsistent quality, spare part prices, and warranties. This study aims to determine the right supplier of manual or automatic motorcycle chains at CV. Agus Motor. The methods used in this study are Analytical Hierarchy Process (AHP) and Topsis. From this study, the results obtained The most optimal supplier based on the calculation of the AHP method which is the first priority is the Cahaya Motor Batam supplier with a weight value of 0.603 and a percentage of 60.30%, the Surya Mega Teknik supplier is the second priority with a weight value of 0.232 and a percentage of 23.2%, and the Sarana Motor supplier is the third priority with a weight value of 0.164 and a percentage of 16.4%. And with the TOPSIS method, the first priority is Supplier Cahaya Motor Batam is a superior alternative with a value of 1,000, Supplier Surya Mega Teknik is the second priority with a value of 0.092, and Supplier Sarana Motor as the third priority with a value of 0.089. Therefore, the first alternative is selected, namely Cahaya Motor Batam to become a supplier for CV. Agus Motor.
ANALISIS PENGENDALIAN KUALITAS PRODUK PIVOT PLATE PADA PROSES ASSEMBLY DI PT SIMATELEX MANUFAKTUR BATAM Ritonga, Bintang; Sirait, Ganda
Computer Science and Industrial Engineering Vol 13 No 1 (2025): Comasie Vol 13 No 1
Publisher : LPPM Universitas Putera Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33884/comasiejournal.v13i1.10284

Abstract

PT Simatelex Manufacturing, located in Batamindo Industrial Park, Batam, specializes in producing household appliances, beauty tools, and robotics. Among the key components they assemble is the pivot plate, which which works as a filter, opener, pod wrapper, and hot water channel. The issue explored in this research is the defect rate of pivot plates, which often surpasses the company’s acceptable limit of 1%. The goal of this study is to assess the pivot plate’s quality, uncover the root causes of defects, and offer solutions to minimize them. To do this, researchers used the Failure Mode and Effect Analysis (FMEA) method, along with supporting tools such as the 5W+1H approach, P charts, and a fishbone diagram. The analysis revealed several main causes: overheating machines (RPN 288), workers rushing during tasks (RPN 192), product build-up (RPN 150), inefficient workstation layout (RPN 180), and fragile materials (RPN 144). To reduce these issues, the study suggests routine machine maintenance, clear work instructions, improved layout planning, and material inspections every two hours by QC. These strategies aim to lower the defect rate and enhance the overall quality of the pivot plate, contributing to better production performance.
PERANCANGAN ALAT BANTU ANGKAT JUMBO BAG PROSES MIXING PADA PT XYZ BATAM Raja Doly Sirait; Sirait, Ganda
Computer Science and Industrial Engineering Vol 13 No 2 (2025): Comasie Vol 13 No 2
Publisher : LPPM Universitas Putera Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33884/comasiejournal.v13i2.10330

Abstract

Labor is one of the most important assets for a company. However, human resources are not free from work-related issues. Ensuring comfort and safety at work can foster enthusiasm among employees. At PT XYZ BATAM, employees in the mixing department who manually and repeatedly pour materials have reported physical complaints. The aim of this study is to minimize the risk of musculoskeletal disorders (MSDs), identify the complaints experienced by workers, and design an ergonomic jumbo bag lifting aid to help improve poor working posture and enhance comfort. This research uses the Rapid Entire Body Assessment (REBA) method to analyze working posture and the Nordic Body Map (NBM) questionnaire to identify physical complaints. The Need, Idea, Decision, Action (NIDA) method is used to gather information needed by workers to reduce workplace issues and to develop new lifting aid designs based on previous tools. The results of the NBM questionnaire serve as the basis for the design process. The study found that workers experienced musculoskeletal complaints in the neck, back, waist, left thigh, right thigh, left knee, and right knee, with a moderate risk category. The most dominant complaint percentage reached 66.66%. As a solution, a jumbo bag lifting aid was designed with specifications of 100 cm in length, 100 cm in width, 120 cm in height, and a volume capacity of up to 1000 kg. This solution provides improved working comfort for employees.
ANALISIS TOTAL PRODUCTIVE MAINTENANCE (TPM) PADA MESIN EKSTRUDER DI PT VOLEX BATAM Zulhamdi, Tommy; Sirait, Ganda
Computer Science and Industrial Engineering Vol 13 No 3 (2025): Comasie Vol 13 No 3
Publisher : LPPM Universitas Putera Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33884/comasiejournal.v13i3.10486

Abstract

At PT Volex Batam, the ekstruder machine is an integral part of the cable production process, used for the extrusion of cable insulation and protective layers. This machine plays a vital role in production; however, during the period of September 2024 to February 2025, a total downtime of approximately 194.4 hours was recorded, which disrupted production and caused delivery delays. This study aims to measure the effectiveness level of the ekstruder machine using the Overall Equipment Effectiveness (OEE) indicator and to identify the factors contributing to the high frequency of machine failures. The methods used in this research are OEE calculation and Six Big Losses analysis. The results show an average OEE value of 73%, which is below the ideal standard of ≥85%. The OEE components include availability at 88%, performance rate at 91%, and quality rate at 90%. The major losses come from equipment failure losses (9.6%), defect losses (8.8%), and idling & minor stoppages (5.1%). Based on the fishbone analysis, four main causes were identified: operator skills, inconsistent SOPs, worn-out machine components, and unstable environmental conditions. The proposed improvements focus on operator training, the implementation of preventive maintenance, and improvement of the working environment.
Co-Authors Ade Gunawan Alqodri, M. Rido ALUMAN MANURUNG, KEVIN anto, juni Firmansyah, Ikhsan Gea, Wirafransiskus Gulo, Darianus Haposan Banjarnahor Harahap, Ummi Kalsum Hindarwan, Rizky Hutapea, Bitson Nerpandi Ilham Kurniawan Jontro Simanjuntak, Jontro Lumban Tungkup, Fairizal Meyfiana, Della Miranda, Canda Muhammad Ilham Muhammad Zulkarnain Noerrohman, Dendi Oktavia, Yunisa Pakpahan, Sopian Pandiangan, Holipman Pangaribuan, Hotma Prasetyo, Bahariandi Aji Raja Doly Sirait riko, suhen suhen Ritonga, Bintang Santi Siahaan SAPRISUL Saputro, Joko Siahaan, Bobby Bernard Siburian, Marben Simanjuntak, Fery Simatupang, Ricky Perdana Sirait, Ripaldo Sisnandar, Mochamad Triadi Sitindaon, Putra Januara Sitohang, Sunarsan Sumantika, Arsyad Tambunan, Yopi Partomuan Tarigan, Elsya P.L. valen, Kevin siambaton Warman, Ricky Wawan Irawan, Wawan Wulandari Ramadhani, Ringgie Zamri Zulhamdi, Tommy