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Jurnal Ilmiah Teknik Mesin & Industri (JITMI)
Published by Universitas Medan Area
ISSN : -     EISSN : 28304047     DOI : 10.31289
Core Subject : Engineering,
Industrial & Manufacturing Engineering Mechanical Engineering
Jurnal Ilmiah Teknik Mesin dan Industri (JITMI) focuses on publishing scientific research findings related to the field of Mechanical and Industrial Engineering. This article is published within the internal and external academic community of the Universitas Medan Area (UMA). The published articles are the results of research and critical, comprehensive scientific studies on important issues related to the aforementioned field of study. The journal has two publication periods, in May and November.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 22 Documents
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Analisis Evaluasi Pelaksanaan Proyek Bendungan Sibiru Biru dengan Metode CPM (Critical Path Method) di PT. PP Andesmont KSO Yuda Wiratama; Sutrisno Sutrisno; Yudi Daeng Polewangi
Jurnal Ilmiah Teknik Mesin & Industri (JITMI) Vol 2, No 2 (2023): Jurnal Ilmiah Teknik Mesin & Industri (JITMI)
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jitmi.v2i2.3418

Abstract

A construction project is a form of activity that lasts for a limited period of time, with certain resources, where the process requires a technique to be used, namely management, planning, scheduling to control. It is not uncommon for construction projects to experience delays in completing the completion time, so that many losses occur, especially in time and costs. With this fierce competition, timely completion of projects is a top priority for construction companies. The purpose of this study is to evaluate the time of scheduling for project completion using the CPM method on the grounds that the shape of the network or network planning can be identified along with the activities that are on the critical path, and can also be known for a more efficient time in carrying out this project. Based on network planning analysis using the CPM method, a series of work activities were obtained that were included in the critical path and the evaluation results showed that the project could be completed in 668 days and then accelerated using the CPM method again, so the project could be accelerated to 545 days, so that the percentage of time efficiency after crashing is 18.42%, with a total cost of IDR 176,557,549,469.00 with a percentage of cost efficiency after crashing is 0.03%.
Penyelidikan Eksperimental Alat Pengisi Daya Menggunakan Termoelektrik Dengan Pemanfaatan Panas Knalpot Sepeda Motor Rizki Wiranata; Muhammad Idris
Jurnal Ilmiah Teknik Mesin & Industri (JITMI) Vol 2, No 1 (2023): Jurnal Ilmiah Teknik Mesin & Industri (JITMI)
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jitmi.v2i1.1950

Abstract

Thermoelectricity is a material that can convert heat energy into electrical energy. By installing a thermoelectric near the exhaust pipe, the heat emitted from the exhaust pipe will automatically be converted into electrical energy. This article discusses the testing of a power charging device that utilizes the heat from the vehicle's exhaust pipe, according to specific requirements. The process begins with the selection of materials and dimensions, followed by design, fabrication, assembly, and performance testing of the power charging device for mobile phones using the heat from the vehicle's exhaust pipe. The objective of this research is to create a device for charging mobile phones or power banks while analyzing the heat generated by the temperature changes. The methodology employed in this study includes experimental setup, device assembly, device testing, and device analysis. The results of the fabrication of the mobile phone charging device using rectangular copper specimens with dimensions of 80 mm in length, 40 mm in width, and 40 mm in height, along with four square-shaped Peltier modules measuring 40 mm x 40 mm x 4 mm each, indicate a voltage output of approximately ±1.5V per Peltier module. The analysis of the heat generated by the temperature changes during testing at 5000 rpm in an idle state resulted in a temperature difference (∆T) of 208.2 K. The voltage produced was 6.06 V, the current was 0.223 A, and the power was 1.35 watts. Testing the engine at 5000 rpm resulted in an electric current of 0.25 A and power output of 1.55 watts. The overall heat transfer rate was U = 23.915 W/℃, and the thermal resistance rate was ΣR = 20.433 oC/W.
Pengendalian Persediaan Bahan Baku Dengan Metode Economic Order Quantity (Eoq) Pada Cv. Suka Bersama Hesti Indah Sari; Ninny Siregar; Nukhe Andri Silviana
Jurnal Ilmiah Teknik Mesin & Industri (JITMI) Vol 1, No 1 (2022): Jurnal Ilmiah Teknik Mesin & Industri (JITMI)
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jitmi.v1i1.1219

Abstract

CV. Suka Bersama is an MSME (Micro, Small Medium Enterprises) in plastic straws (pipettes) manufacture. The main materials used in the process of making this pipette are polypropylene and dye which consists of three colors, namely yellow, green, and red. Currently CV. Suka Bersama only used estimates in raw materials purchasing. If the raw materials ran low in the warehouse, then CV. Suka Bersama had to reorder raw materials based on use, so it often had the unavailability and excess stocks in the warehouse. Where there was excess, there would be additional costs, and if there was less, production would be hampered. One way that could be used to overcome this was by applying ordering raw materials using the Economic Order Quantity (EOQ) method which was used to determine the number of orders or purchases that might be made and how many quantities might be ordered. So that the total costs in the sum of ordering and storage costs were a minimum, raw material inventory control and how to apply the economic order method, safety stock reorder point, and total cost in controlling raw material inventory. By calculating the raw material inventory issued by the company was Rp. 4,429,969 while using the EOQ method was Rp. 979,110 of the total cost of raw material inventory was more efficient using the EOQ method with a difference of Rp. 3,450,859.
Efisiensi Turbin Kincir Air Akrilik Undershot 8 Sudu 15o Rizky Tampubolon; Indra Hermawan; Muhammad Idris
Jurnal Ilmiah Teknik Mesin & Industri (JITMI) Vol 2, No 1 (2023): Jurnal Ilmiah Teknik Mesin & Industri (JITMI)
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jitmi.v2i1.2015

Abstract

Electricity is one of the vital energy sources that is highly demanded by society. However, there is still an imbalance in the availability of electricity in Indonesia, especially in remote or isolated areas that are difficult to reach by the national power grid (PLN). To address this issue, one of the solutions that can be employed is Micro Hydro Power Plant (PLTMH), which is a renewable power generation system. In PLTMH, water turbines are utilized as a medium to generate rotation through the force exerted by the flowing water from a certain height. The water head plays a significant role in the performance of the water turbine, where a higher waterfall and impact on the turbine blades result in faster rotation and greater energy production. This study presents the experimental results of an Undershot Water Turbine made of Acrylic material with 8 blades and a blade angle of 15°. The experiment employed a water volume of 58 liters and a water gate opening of 3 cm. The results showed that the water turbine generated a power of 0.41584 watts, while the power produced by the flowing water was 1.23186 watts. The efficiency of the water turbine in this experiment reached 33%. Based on this research, it can be concluded that the proper utilization of an Undershot Water Turbine made of Acrylic material with an appropriate number and angle of blades can yield significant power output. Moreover, the achieved efficiency level of 33% demonstrates that the water turbine can serve as an efficient alternative for renewable electricity generation.
Pengaruh Kelengkapan Kesehatan dan Keselamatan Kerja (K3) Terhadap Kecelakaan Kerja di PDAM Tirta Bulian Tebing Tinggi Riskilan Muda; Sirmas Munthe; Yuana Delvika
Jurnal Ilmiah Teknik Mesin & Industri (JITMI) Vol 1, No 2 (2022): Jurnal Ilmiah Teknik Mesin & Industri (JITMI)
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jitmi.v1i2.1463

Abstract

PDAM Tirta Bulian Tebing Tinggi is a company run in the processing of clean water by the Regional Drinking Water Company (PDAM). In the last 2 years, there has been an increase in the number of accidents on the production floor. This result was a major problem that human resources are the most important asset for the company so that it needs to be protected by the OHS program, where the company is based on the achievement level of the implementation OHS management program. Measurement of the OHS management program achievement level was carried out by distributing questionnaires to production floor employees to obtain the achievement level of the implementation OHS management program at PDAM Tirta Bulian Tebing Tinggi. Then, the success rate measurement of the OHS management program was carried out by conducting an OHSMS audit based on the Government Regulations Republic of Indonesia number 50 in 2012 towards the OHS management program that has been owned by PDAM Tirta Bulian Tebing Tinggi. Furthermore, the success rate of implementing the OHS program was at 54.21%, or the red category where violations of laws and regulations could be subject to legal action. The measurement results showed a lack of company attention to occupational safety and health for employees and company assets. Thus based on the measurement results, the company must immediately improve the OHSMS based on the government’s rules.
Analisis Line Balancing Dengan Metode Moodie Young Proses Produksi Pabrik Keripik Kreasi Lutvi Tuntungan 2 Yeheskiel Hutabarat; Sirmas Munthe; Sutrisno Sutrisno
Jurnal Ilmiah Teknik Mesin & Industri (JITMI) Vol 2, No 2 (2023): Jurnal Ilmiah Teknik Mesin & Industri (JITMI)
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jitmi.v2i2.3419

Abstract

Kreasi Lutvi Tuntungan II Chips Factory is a cassava chips production company facing significant idle time issues at various workstations. Workstation 2 experiences idle times of 599.87 seconds, 302.19 seconds, and 894.88 seconds. Workstation 3 encounters idle times of 1171 seconds and 138.75 seconds, while Workstation 4 has idle times of 625.56 seconds and 900.48 seconds. These idle times result from substantial disparities between the cycle times in the production line and workstation times. This study uses the Moodie Young method to assess the impact of workstations and idle time on the production line balance at Kreasi Lutvi Tuntungan 2 Chips Factory. The research investigates workstations and idle times to identify congestion and assess production line balance. The study outputs include the production line balance, represented by Balance Delay, Line Efficiency, and Smoothness Index, to determine the overall balance of the production line. The findings indicate suboptimal line efficiency on the actual line, with 4 workstations and 8 work elements achieving a line efficiency of 83%, a Balance Delay of 11.42%, and a Smoothness Index of 1195.85. In contrast, applying the Moodie-Young method results in improved line efficiency at 73.77%, a reduced Balance Delay of 22.06%, and an enhanced Smooth Index of 1798.85. This demonstrates that the Moodie Young method provides a more optimal level of line balancing compared to the existing production line at Kreasi Lutvi Tuntungan 2 Chips Factory.
Analisis Efektivitas Perpindahan Panas Kondensor pada Proses Destilasi Daun Serai Wangi Septa Fernando Karo Karo; Darianto Darianto; Muhammad Idris
Jurnal Ilmiah Teknik Mesin & Industri (JITMI) Vol 2, No 1 (2023): Jurnal Ilmiah Teknik Mesin & Industri (JITMI)
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jitmi.v2i1.1951

Abstract

The condenser is one of the main components in a system that condenses vapor into liquid. The performance of a condenser can be influenced by heat transfer rate, vacuum pressure, and effectiveness. The aim of this research is to determine the effectiveness value and variables that affect the performance of the condenser in the lemongrass distillation process, as well as to understand the influence of heat transfer rate on film condensation (condensate vapor mass). The research method used the Log Mean Temperature Difference (LMTD) and Effectiveness - Number of Transfer Unit (NTU) to calculate the effectiveness value and compared the condensate vapor mass with the mass flow rate of vapor to obtain film condensation. The research results showed an effectiveness value of 89% in the condenser, and the condensate vapor mass accounted for 36% of the biooil. The influencing variables were a capacity ratio of 0.0182840, a heat transfer rate of 186544.68 W, and an LMTD of 29.74°C. Therefore, it can be concluded that the condenser used in the lemongrass distillation process still performs well.
Analisis Kepuasan Nasabah pada Kualitas Pelayanan dengan Metode Fuzzy Service Quality dan Quality Function Deployment di PT Bank Mandiri Yeni Yuswita Ginting; Ninny Siregar; Yuana Delvika
Jurnal Ilmiah Teknik Mesin & Industri (JITMI) Vol 1, No 1 (2022): Jurnal Ilmiah Teknik Mesin & Industri (JITMI)
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jitmi.v1i1.1220

Abstract

Service quality is the most important factor for the bank so that the Bank can keep surviving and developing. Every day the number of customers development is increasing so that the service quality and customer satisfaction must be prioritized. The way to improve service quality is trying to find out customers' desires, where the Fuzzy Servqual (Service Quality) and QFD (Quality Function Deployment) methods were used in improving the quality of bank services. The purpose of this research was to design a service improvement proposal at Bank Mandiri KCP Medan Citra Garden by using Fuzzy Servqual and QFD. In this study, a survey was conducted by distributing questionnaires to 100 respondents from Bank Mandiri KCP Medan Citra Garden based on data processing performed using the Fuzzy Servqual method, for designing improvement proposals using the Quality Function Deployment (QFD) method. The level of customer satisfaction at Bank Mandiri KCP Medan Citra Garden was lower than the importance level of affected factors in customer satisfaction at Bank Mandiri KCP Medan Citra Garden which needed to be more improved was the Tangible dimension (Physical Evidence) shown in the comfort and security of the location and parking lot provided with a score of -13.17. Furthermore, that had to be maintained on the Tangible dimension (Physical Evidence) was shown in the bank officers' appearances who were always neat and wore masks and gloves with a score of 4.496 at Bank Mandiri KCP Medan Citra Garden. Thus, it was recommended to Bank Mandiri KCP Medan Citra Garden to further improve service performance on all services.
Penggunaan Metode Moodie Young Pada Keseimbangan Lintasan Produksi Bola Lampu Didit Teguh Prasetyo; Sutrisno Sutrisno; Ninny Siregar
Jurnal Ilmiah Teknik Mesin & Industri (JITMI) Vol 2, No 1 (2023): Jurnal Ilmiah Teknik Mesin & Industri (JITMI)
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jitmi.v2i1.2016

Abstract

The Use of Moodie Young Method in Balance of Light Bulb Production Line. Line production is a part of production activity which including set of working element works and working area. Several balance constraints on the production line are sometimes occurred in a company who runs in light bulb production, such as a bottleneck in the production process and accumulation of material at work stations due to the high idle times, also a gap in cycle time between the production times of each work station. The study employed the Moodie Young method by measuring three parts of balanced production line level, including Line Efficiency, Balance Delay, and Smoothness Index. The result pointed out that the actual production line values are Line Efficiency 43.69%, Balance Delay 56.30%, and Smoothness Index 703.64. The result also stated that there are improvement of the production line values by using Moodie Young method, which are values of Line Efficiency 76.46%, Balance Delay 23.53%, and Smoothness Index 279.39. To sum up, the high value of line efficiency and the low values of balance delay and smoothness index presents a good level of balanced the production line.
Analisis Pengendalian Mutu Minyak Sawit Dengan Metode SQC Pada PKS PT. Perkebunan Nusantara IV Adolina Riva Suyanto Sitinjak; Marali Banjarnahor; Yuana Delvika
Jurnal Ilmiah Teknik Mesin & Industri (JITMI) Vol 1, No 2 (2022): Jurnal Ilmiah Teknik Mesin & Industri (JITMI)
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jitmi.v1i2.1464

Abstract

PT. Perkebunan Nusantara IV Adolina North Sumatra is a company engaged in the processing of palm oil. The product produced is Crude Palm Oil (CPO). Quality control is the use of techniques and activities to achieve maintain and improve the quality of a product or service.  While Statistic Quality Control is a statistical technique used widely to ensure that processes meet standards. This study aimed to analyze the quality control of palm oil if it meets the standard, and then do quality improvement so as not to vary too far from the standards that have been determined because the better quality is far from the limit control, the result obtained is better for the company to gain trust about the quality of CPO, an analysis was carried out by managing inspection data of seven quality parameters using control chart analysis tool and cause-effect diagrams. From the results of the research conducted, it was found that 3 parameters greatly affect the quality of palm oil, namely ALB content, moisture content, and dirt content. The cause of high ALB levels. Moisture content, and dirt content are due to improper maturity, storage duration, and not doing good sorting. In addition, the engine performance is unstable due to the age of the engine that has been operating for a long time.

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