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Jurnal Optimalisasi
Published by Universitas Teuku Umar
ISSN : 24775479     EISSN : 25020501     DOI : https://doi.org/10.35308/jopt
Core Subject : Engineering,
Control & Systems Engineering Industrial & Manufacturing Engineering
JURNAL OPTIMALISASI (JOPT) merupakan jurnal elektronik online yang diterbitkan oleh Program studi Teknik Industri, Fakultas Teknik, Universitas Teuku Umar. JOPT memuat kajian dibidang Manufaktur, Ergonomi dan Manajemen Rantai Pasok. Tujuan penerbitan jurnal optimalisasi adalah sebagai wadah publikasi yang mewadahi kebutuhan peningkatan kualitas karya ilmiah dalam rangka pengembangan keilmuan dan menyebarluaskan kajian bidang ilmu Teknik Industri, sekaligus sebagai wahana komunikasi diantara cendekiawan, praktisi, mahasiswa dan pemerhati masalah Industri. JOPT terbit dua kali dalam setahun, tepatnya pada bulan April dan Oktober. Bagi pembaca, penulis, dan yang melakukan akses situs jurnal yang ingin submit naskah ke jurnal ini, silakan mendaftar sebagai author kemudian login untuk submit naskah. Informasi penulisan dan submit naskah dapat diakses di author guidelines dengan mengikuti pentunjuk di situs jurnal.
Arjuna Subject : Teknik (semua kategori) - Tenik Industri dan Manufaktur
Articles 249 Documents
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Evaluation of Employee Mental Workload Using the Rating Scale Mental Effort and KAUPK2 Method in the Production Process of Spoon Making PT. VRIZ Fais, Moh. Ainul; Deviyanti, I Gusti Ayu Sri; Tjandra, Suhatati; Mohamad, Silvana; Lapai, Yolanda; Syahrir H, Muhammad
Jurnal Optimalisasi Vol 10, No 2 (2024): Oktober
Publisher : Universitas Teuku Umar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35308/jopt.v10i2.9911

Abstract

Ergonomics is an approach that makes humans the main actors in the smooth running of the work system. PT. VRIZ is a company that produces stainless steel spoons. The manufacture of spoon products has 8 stages of the process with one employee working at any time and not allowed to stop before break time, the working hours that apply to this company are 7 working hours with 1 hour of rest. Static work has the potential to be easily bored, saturated and sleepy. This study aims to minimize the risky process flow taken in evaluating employee mental workload, analyzing the results of the two methods used, and providing recommendations for improvements in the workplace. With a better understanding of employee mental workload, PT. VRIZ can achieve higher levels of productivity and create a healthier and more sustainable work environment. The stages in this study use the RSME and KAUPK2 methods in data collection, this approach has a tool in the form of a questionnaire that must be filled out by the object or employee. The data obtained will be an early indication to provide improvements to the work system to reduce the impact of work fatigue. The Mental Effort Rating Scale questionnaire is one method of measuring mental workload by referring to the effort expended, while KAUPK2 is one method of measuring worker fatigue. The results of the Mental Effort Rating Scale show an average value of mental load of 115 (the effort expended is very large) and employee work fatigue using KAUPK2 shows the most dominant attributes felt by 8 employees, namely being reluctant to look others in the eye, being reluctant to work diligently and feeling tired all over the body.
Tingkat Kepuasan Mahasiswa pada Sistem Pelayanan Akademik Fakultas Teknik Menggunakan Metode Service Quality dan Model Kano di Masa Pandemi Covid 19 Sofiyanurriyanti, Sofiyanurriyanti; Saputra, Endi; Kasmawati, Kasmawati
Jurnal Optimalisasi Vol 10, No 1 (2024): April
Publisher : Universitas Teuku Umar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35308/jopt.v10i1.8758

Abstract

Saat ini di Fakultas Teknik sendiri sudah memiliki empat program studi di dalamnya dengan total mahasiswa aktif ±1500 dengan bertambahnya mahasiswa baru pada semester ganjil tahun 2021. Berdasarkan observasi awal, pengalaman, pengamatan, dan wawancara ditengah pandemi covid 19 sistem akademik FT UTU terkendala disaat mengurus administrasi kampus menggunakan shift bergantian, lamanya proses administrasi yang belum berjalan secara efisien. Tujuan Penelitian untuk menentukkan atribut yang berpengaruh paada tingkat kepuasan mahasiswa pada sistem pelayanan akademik FT UTU dimasa pandemi covid dan menentukan nilai tiap atribut dengan servqual dan model kano. Pengolahan data pada penelitian ini menggunakan metode servqual digunakan untuk mengidentifikasi atribut apa saja yang harus dipertahankan dan ditingkatkan kualitas pelayanannya sedangkan model Kano untuk mengukur kepuasan pelanggan. Metode servqual merupakan metode yang mengidentifikasi kualitas pelayanan berdasrkan tingkat persepsi dan harapan sedangkan model kano digunakan untuk kategorikan atribut yang diiginkan oleh konsumen.  Hasil penelitian nilai servqual (Q) masih dibawah 1 atau 0,88 ≤ 1 nilai rata-rata kualitas pelayanan servqual sebesar 0,88 yang berarti kualitas pelayanan di Akademik FT UTU masih belum baik karena nilai dibawah ≤ 1 atau 0,88 ≤ 1. Sedangkan pada model kano atribut yang pada rentang kategori  grade 1-6 diambil dari must-be.
Perancangan Ulang Tata Letak Fasilitas pada Industri Garmen dengan Metode BLOCPLAN Santoso, Santoso; Heryanto, Rainisa Maini; Kartawidjaja, Maria Angela; Sukwadi, Ronald
Jurnal Optimalisasi Vol 10, No 1 (2024): April
Publisher : Universitas Teuku Umar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35308/jopt.v10i01.9238

Abstract

Currently, developments and changes are occurring very rapidly in the garment industry. Technological advances and the recent Covid-2019 pandemic have led to a significant increase in online product purchases. This has had quite a big impact, as the movement of materials within the industry can change significantly. Such changes can render material movement less efficient, leading to a decrease in work productivity. Therefore, it is necessary to redesign the layout to ensure efficient material movement. The goal of this layout redesign is to minimize the total distance moved. Computer-aided layout (CAL) has garnered much interest from researchers, as it offers benefits such as generating numerous alternative layout improvements in a short time. The method used for redesigning the layout in this research is one CAL method, namely the Block Layout Overview with Layout Planning (BLOCPLAN) method. In this case study, data processing will be carried out using BLOCPLAN-90 software. The total material movement distance in the initial layout is 119,885.25 meters per month, while the total distance of material movement in the proposed layout is 61,840.33 meters per month. This indicates a decrease in the total material movement distance of 58,044.92 meters per month, or a reduction of 48.42 percent. With a decrease in the total material movement distance, it is expected that work efficiency and productivity will increase.
Identifikasi Potensi Bahaya pada Stasiun Boiler Menggunakan Metode Hirarc di PT. Syaukath Agro Hidjrawan, Yusi; Hartati, Rita; Marlinda, Marlinda; Ariansyah, Wanda
Jurnal Optimalisasi Vol 10, No 1 (2024): April
Publisher : Universitas Teuku Umar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35308/jopt.v10i01.9292

Abstract

PT Syaukath Agro is a company operating in the Agribusiness Sector which is engaged in processing palm oil Fresh Fruit Bunches (FFB) into crude palm oil (CPO), Palm Kernel (PK) and shells. The palm oil processing system consists of several stages starting from receiving Fresh Fruit Bunches (FFB) to becoming palm oil or Crude Palm Oil (CPO). The palm oil processing process can be used in several stages carried out at each station. Based on interviews conducted, each station has a different level of risk of accidents, one of the stations that has a large risk of work accidents is the boiler station which is the heart of a palm oil factory where the steam boiler is the source of power and the source of the steam that will used to process palm oil. Boilers have potential dangers or risks when operated. The risks that often occur are falls, slips, burns, scalds, heat, noise, so it is very important to supervise and provide guidance regarding work safety. The size of the accident caused will certainly have a detrimental impact on the company. The severity of the accident can be determined through identification of potential dangers and risk assessment of all boiler operating activities at PT. Syaukath Agro. Based on the results of research conducted using the hirarc method, potential hazards found in boiler stations include: Unergonomic Working Attitudes, Noise Levels >84 dB with 8 Hours/Day Exposure, Working climate temperature (hot) 31°C on exposure >8 working hours/day, and oil buildup. Types of risk of work accidents at boiler stations consist of: Falls, injuries (slipping, slippery floors) Burns (in contact with hot objects around), Heat exhausting (Heat), Work accidents (fatigue ), hearing loss (noise), blisters (burns), health problems (muscles, bones), contact dermatitis (exposed to dangerous toxic radiation). Based on the results of risk control, it was found that the most appropriate type of control recommendation is administrative control and compliance with the use of personal protective equipment (PPE). Administration (Administration Control) is carried out by creating or providing a work system that can reduce the possibility of someone being exposed to potential dangers. The hierarchy of control of Personal Protective Equipment (PPE) is used to provide a boundary between exposure to the body and the potential danger received by the body.
Pengendalian Kualitas Produk Griller Menggunakan Failure Mode Effect and Analysis (FMEA) dan Root Cause Analysis (RCA) Chusnah, Asma’ul; Cahyana, Atikha Sidhi
Jurnal Optimalisasi Vol 10, No 1 (2024): April
Publisher : Universitas Teuku Umar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35308/jopt.v10i1.9459

Abstract

A company engaged in the slaughterhouse of boiler chickens and one of its products is griller, which is chicken that is cut in a halal manner and packaged in the form of a whole carcass. Based on daily reports, the number of defects found in griller products shows a percentage of up to 30%. The purpose of this study is to identify the types of defects found in grillers so that alternative improvements can be determined. This research uses the Failure Mode Effect Analysis (FMEA) method to identify the most dominant types of defects in the product and find the causes. The highest defects from the FMEA results are processed by the Root Cause Analysis (RCA) method to provide improvement proposals so as to reduce the number of existing defects. The results of this study show that the most dominant type of defect is feathers remaining on the carcass with the highest RPN value of 175. The defect of feathers still remaining on the carcass is caused by workers who do not follow the SOP correctly, the changing size of raw materials, and rubber. The plucking machine is worn and loose, the settings of the plucking machine are loose, the temperature of the scalder tends to drop, the inspection in the process is not correct, there is no information on how to operate the machine, the raw materials are not uniform, and the working environment temperature is high and noisy.
Analisis Pengendalian Kualitas Produk Songkok Menggunakan Metode Statistical Proses Control dan 5W+2H pada UD. Tiga Kunci Rufaidah, Anik; Izzah, Nailul; Suparno, Suparno; Rosyidi, Moh Ririn
Jurnal Optimalisasi Vol 10, No 2 (2024): Oktober
Publisher : Universitas Teuku Umar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35308/jopt.v10i2.9856

Abstract

In the period of the quality manufacturing sector, it is critical to pay attention to raw materials and product compatibility for consumers in order to preserve the quality supplied to them. Quality control is an important step in ensuring that the products produced fulfill defined specifications. Statistical Process Control (SPC) is a technique for monitoring and controlling the manufacturing process using statistical approaches. UD Tiga Kunci Songkok is a top manufacturer of high-quality songkok in Bungah Village, Gresik Regency, Indonesia. Established in 1985, our company has been dedicated to preserving the archipelago's traditions and culture by producing exquisite and comfortable songkok. Even yet, there are still flaws that arise at UD Songkok Tiga Kunci. Defects continue to develop throughout the last five months, from January to May 2024. There are 132 songkoks with faults. If this situation is not addressed, UD will suffer financial losses. Three Key Chompong aims to improve product quality and competitiveness by expanding the use of SPC in songkok production. Additionally, this 5W2H will address product defects. The research revealed that there are three sorts of faults that develop in UD  Tiga Kunci: 45.5% of disorderly amounts, 40.2% of sloppy stitching, and 14.4% of velvet fabric, with the highest number of flaws. The control chart shows values of ucl=0.093, lcl=0, and cl/p ̅=0.043, indicating no deviation from the control line (despite the presence of flaws in the defect proportion). The factors that cause the most flaws in Songkok (untidy sum) are man, material, machine, and process. Knowing this, the corrective actions made at UD. Tiga Kunci keys monitor and evaluate each songkok manufacturing process to obtain mitigation procedures for songkok products.
Pengendalian Persediaan Bahan Baku Petis Udang dengan Menggunakan Metode Economic Order Quantity (Eoq) di Ud. Agung Jaya Rufaidah, Anik; Rosyidi, Moh. Ririn; Suparno, Suparno
Jurnal Optimalisasi Vol 10, No 1 (2024): April
Publisher : Universitas Teuku Umar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35308/jopt.v10i1.8431

Abstract

Raw material inventory is very important for companies. UD. Agung Jaya is a company that operates in the food sector, namely Petis Udang. Problems at UD. Agung Jaya has raw material stock problems, namely a shortage or excess of raw materials. The aim of this research is to help optimize UD costs of UD. Agung Jaya. This research uses raw material purchase data for shrimp heads, sugar, and flour which is processed by forecasting calculations for 12 periods or 1 year into the future using the single exponential smoothing (SES) time series forecasting method. The aim is to determine the need for raw materials so that there are no shortages or excesses of raw materials during the ongoing production process, and the efficiency of raw material needs in this research. The results of the research show that the raw material for shrimp heads has a mape error value of 24, sugar has a mape error value of 24, and flour has a mape error value of 26.1. Furthermore, the raw material decomposition method for shrimp heads has a mape error value of 15, sugar has a mape error value of 15, and flour has a mape error value of 16.42. The second result of forecasting shows that the decomposition method obtains a smaller mape value or the lowest error value. This research also uses the Economic Order Quantity (EOQ) method in the 2022-2023 period with raw material yields of 515.28 kg of shrimp heads, 488.54 kg of sugar and 188.09 kg of flour.
Identifikasi dan Mitigasi Risiko pada Proyek Konstruksi Menggunakan Metode House of Risk: Studi Kasus Irawan, Heri Tri; Pamungkas, Iing; Hasnita, Hasnita; Fauza, Teuku Soleh
Jurnal Optimalisasi Vol 10, No 1 (2024): April
Publisher : Universitas Teuku Umar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35308/jopt.v10i01.9302

Abstract

PT. Rigis Beukarya Property is a developer and contractor for housing projects in the West Aceh region. Housing projects that are implemented often experience obstacles in the construction of the project, such as over budget from the predetermined RAB, repeated repairs, materials that are ordered late, and exposure to bad weather which results in large losses due to these obstacles. The aim of this research is to identify risks in the Grand Keutapang housing development process, and mitigate the dominant risks in the Grand Keutapang housing development process. The House of risk (HOR) method is used to solve this problem by identifying risk events, risk agents and also designing risk agent mitigation strategies based on Aggregate Risk Potential (ARP) values. The results obtained from the house of risk stage 1 risk mapping show that there are 5 dominant risk agents that will be taken into consideration in developing mitigation actions, namely: A-14 (Lack of coordination between parties involved) with an ARP value of 3,384, A-1 (Incompetent/careful workforce) with an ARP value of 1,800, A-12 (Fluctuating company financial cash flow) with an ARP value of 826 , A-15 (Lack of supervision in the field) with an ARP value of 777, and A-8 (Increase in material prices) with an ARP value of 696. From the results of the house of risk phase 2 risk mapping, 5 risk mitigation action plans were obtained, including: PA-1 (Creating a monitoring and sanctions system) with an ETDk value of 5,961, PA-2 (Creating a standard diary (buhas)) with an ETDk value of 3,331, PA-3 (Creating a complete checklist) with an ETDk value of 6,236, PA - 4 (Making adaptive cost estimates) with an ETDk value of 4,270, and PA-5 (Improving the effectiveness of communication with all parties) with an ETDk value of 8.427.
Perencanaan Perawatan Mesin Building Dengan Metode Reliability Centered Maintenance (RCM) Muhazir, Achmad; Sinaga, Zulkani; Septiadi, Resky Dwi
Jurnal Optimalisasi Vol 10, No 1 (2024): April
Publisher : Universitas Teuku Umar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35308/jopt.v10i01.9263

Abstract

PT. Bridgestone Tire Indonesia is a tire manufacturing company. Machines that work continuously and lack of stock availability of machine spare parts cause damage and increase maintenance costs. To reduce the occurrence of damage and increase maintenance costs, it is necessary to have an optimal maintenance policy so that the machine can operate well. To overcome the problems in this research using the Reliability Centered Maintenance (RCM) method, the first step is determining the critical components on the machine, preparing the FMEA table based on the function data of the components and maintenance reports and calculating the Risk Priority Number (RPN), then calculating the MTTF and MTTR to determine maintenance and repair intervals and find optimal total maintenance costs. Machine building has the highest frequency of downtime so this research will focus on machine building components. The results of data processing show that the highest frequency of machine damage and total downtime is the cause of hose component failure due to poor hose quality and seal components becoming worn, causing increased frequency of damage, downtime and maintenance costs. Based on maintenance cost calculations using the RCM method, hose and seal components experienced a decrease in costs, namely hose components by 55.13% and seal components by 25.45%. The proposed building machine maintenance for hose and seal components in particular is to carry out scheduled tasks, scheduled exhaust tasks, and default actions with the task category of finding failures and results for maintenance time intervals for hose components of 280.81 hours and for seal components of 134.08 hours.
Evaluasi Pengendalian Persediaan WIP dengan Metode Production Order Quantity (POQ) di Perusahaan Manufaktur Ban Puspasari, Luky; Hasibuan, Sawarni
Jurnal Optimalisasi Vol 10, No 2 (2024): Oktober
Publisher : Universitas Teuku Umar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35308/jopt.v10i2.10105

Abstract

The inventory system throughout the supply chain network must be effectively controlled, making Work in Process (WIP) inventory control essential. In tire manufacturing, Green Tire inventory holds the highest WIP value and is consistently maintained. However, inconsistent order quantities have resulted in uncontrolled inventory levels, leading to overstock in the storage area. This study aims to analyze the priority categories of Green Tire inventory, evaluate the optimal order quantities, and compare total inventory costs to minimize the overall cost. The methods used include ABC Analysis and Production Order Quantity (POQ) with safety stock, applying service levels of 93%, 90%, and 80% for A, B, and C categories, respectively. The findings indicate that Green Tire inventory class A accounts for 65% of the volume and 67% of the total inventory value, class B for 23% of the volume and 28% of the value, and class C for 11.9% of the volume and 5% of the value. Implementing the POQ method standardizes order quantities across rim codes, reducing maximum inventory levels by up to 69.38%. Total storage cost savings reached 66.15%, with only a 0.2% increase in setup costs. The POQ method achieved total inventory cost savings of 52.37% for Green Tire inventory.

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