cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
A. Jannifar
Contact Email
polimesin@pnl.ac.id
Phone
+628126930456
Journal Mail Official
polimesin@pnl.ac.id
Editorial Address
Politeknik Negeri Lhokseumawe Jl. Banda Aceh-Medan Km 280 Buketrata, Lhokseumawe, 24301, Aceh, Indonesia
Location
Kota lhokseumawe,
Aceh
INDONESIA
Jurnal Polimesin
Published by Politeknik Negeri Lhokseumawe
ISSN : 16935462     EISSN : 25491199     DOI : http://dx.doi.org/10.30811/jpl
Core Subject : Science, Engineering,
Automotive Engineering Control & Systems Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering
Polimesin mostly publishes studies in the core areas of mechanical engineering, such as energy conversion, machine and mechanism design, and manufacturing technology. As science and technology develop rapidly in combination with other disciplines such as electrical, Polimesin also adapts to new facts by accepting manuscripts in mechatronics. In Biomechanics, Mechanical study in musculoskeletal and bio-tissue has been widely recognized to help better life quality for disabled people and physical rehabilitation work. Such a wide range of Polimesin could be published, but it still has criteria to apply mechanical systems and principles. Exceeding the limitation has been a common reason for rejection by those outside the scope. Using chemical principles more than mechanical ones in material engineering has been a common reason for rejection after submission. Excessive exploration of the management within the discipline of Industrial Engineering in the manufacturing technology scope is also unacceptable. The sub-scope biomechanics that focuses on ergonomics and does not study movement involving applied force on the bio-tissue is also not suitable for submission.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 503 Documents
 35   36   37   38   39 
Cascade flow rate-temperature control system design based on PID controller using direct synthesis tuning method Pradana, Mochamad Rizky; Aristoni, Deni; Triyanto, Roni Heru; Yuliatin, Umi; Budi, Suka Handaja
Jurnal Polimesin Vol 22, No 6 (2024): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i6.5960

Abstract

Cascade control is one of the multi-loop control schemes that aim to increase the performance of closed-loop control systems. Temperature control on the outlet of a plate heat exchanger often from suffers errors in the control variable and designated set point, so it is necessary to use cascade control in order to stabilize output temperature and reduce the disturbance. The Proportional Integral Derivative (PID) controller in conjunction with the direct synthesis tuning method is used due to ease of implementation and to modify the second-order process model and become the first-order process model, simplifying the model. In cascade control, the flow rate control is designated as the secondary loop, while the temperature control functions as the primary loop. The PID controller model is designed with direct synthesis tuning on the cascade flow rate temperature control, resulting a proportional gain of 2.15%, of 1.976 s, and τd of 0 seconds on the flow rate control loop. Whereas on the temperature control loop, the proportional gain is 13.23%, is 66.3 s and the τd is 7 seconds. The transient responses from cascade flow rate temperature control from Simulink are rise time (tr) = 106.7 seconds, settling time (ts) = 183 seconds, and maximum overshoot = 0%. Based on this parameter, the controller generates Process Variable (PV) responses from master control that can reach the Set Point (SP) without overshoot, maintain a steady state, and reduce the disturbance from slave control within 20 seconds of the response increasing from the steady state condition
Quality improvement using lean six sigma in air conditioning products Purwanto, Cipto; Jayanti, Brian Sila; Bernard, Fransiska Sekarlati; Ekawati, Ardhianiswari Diah
Jurnal Polimesin Vol 22, No 5 (2024): October
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i5.5408

Abstract

Air Conditioners (AC) are essential electronic products for residential and industrial buildings in tropical countries or during warm weather in general. The penetration ratio of electronic Air Conditioners (AC) has been increasing every year. Data collection and processing were conducted directly by the author through observation, measurement, and calculation on the heat exchanger production of Air Conditioners (AC). In the production cost of Air Conditioners (AC), the heat exchanger accounts for the second highest cost after the compressor making up 19% of the total cost. The high cost is caused by pipe leaks, with a percentage of 73.7%. This research aims to analyze the improvement of Air Conditioner (AC) production quality using the Six Sigma method. The defect rate in the heat exchanger, evaluated through the Define, Measure, Analyze, Improve, Control (DMAIC) method originating from Six Sigma, was found to be 1,144.8 defects per million opportunities. Further analysis was conducted with the Failure Tree Analysis (FTA) and Failure Mode and Effect Analysis (FMEA) methods. This research was conducted at XYZ company by conducting interviews and observations for 3 months. FMEA and FTA analysis resulted in the top two failure risks based on the Risk Priority Number (RPN): flaring diameter too big and unstable brazing skill. In the manual brazing process, it was found that work by operators with level A certification produced 9% below standard outcomes. An improvement was obtained by changing the punch flaring size to 8.5mm and conducting skill certification and training for brazing operators. The results of the proposed improvement implementation led to a reduction in the DPMO value to 403.35, equivalent to a decrease of 64.7%. The defect ratio in production decreased by 38.1%, exceeding the previous target of 26.2%, equivalent to $31.96/month/unit. The results of this study are horizontal, allowing the implementation of improvements made in the heat exchanger production process to be expanded to other cooling electronic production processes.
The impact of material selection and design on the environment in the process of making press tools for garment hanging products in sustainable manufacturing Amrullah, Radhi Nurvian; Hadi, Syamsul; Rizza, Muhammad Akhlis; Yudiyanto, Eko; Sharif, Safian; Suhaimi, Mohd Azlan
Jurnal Polimesin Vol 22, No 5 (2024): October
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i5.5457

Abstract

The design and material selection used during the manufacturing process significantly impact the environment due to their energy consumption and waste production, including carbon dioxide emissions. This study used the LCA tool eco-indicator to evaluate the environmental impact of producing clothes-hanging machines. Two different press tool designs were analyzed, each using other materials for punch and die. The results indicate that the press tool design 2 with SKD11 punch and die is suitable for long-term use but emits the highest CO2 emissions at 102.33 kg CO2. In contrast, the press tool design 1 with S45C punch and die is suitable for short-term use but emits the lowest CO2 emissions at 69.72 kg CO2.
Heat distribution analysis of cartridge heater in core and cavity of compression mold for bio-composite roof tile fabrication Al Masta, Muslimin; Rahman, Maulidya; Luqyana, Dhiya; Muhamad, Azam Milah
Jurnal Polimesin Vol 22, No 6 (2024): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i6.5721

Abstract

Bio-composite roof tiles use polypropylene matrix material and rice straw fiber as reinforcement processed by compression molding to create innovative and sustainable building products. This research aims to analyze heat distribution from the cartridge heater in the mold core during the compression molding process for fabricating bio-composite roof tiles. The research employs Finite Element Analysis (FEA), and laboratory experiments to measure temperature distribution and heating efficiency. The results showed that even heat distribution on the mold core is crucial to ensure optimal final product quality. Manual calculation estimated a heating time of 170.78 seconds to reach the desired temperature. Simulations conducted using Ansys R19.2 software shows that the temperature variation on the surface of the mold core can be minimized with the optimal placement of the heater cartridge. The simulation results obtained a time of 10 seconds to reach a temperature of 200℃ gradually. Laboratory experiments support the simulation results by showing that good heat distribution improves bio-composite tile materials' mechanical strength and homogeneity. This research significantly contributes to the design and optimization of mold cores for bio-composite applications. It offers practical guidance to the industry in improving the efficiency of the production process.
Kinetics of transesterifying multifeedstock oil into biodiesel Aulia, Haris Numan
Jurnal Polimesin Vol 22, No 6 (2024): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i6.5609

Abstract

The synthesis of biodiesel is typically performed using homogeneous catalysts and high-temperature transesterification methods. This research aims to investigate the kinetics of transesterification reactions in biodiesel synthesis using a blend of six different types of oils: coconut oil, palm oil, soybean oil, canola oil, sunflower oil, and waste cooking oil. An equal volume of each oil is used to combine the multifeedstock oil, totaling 300 ml. After pretreatment, the multifeedstock oil is heated to 30, 40, 50, and 60°C, combined with a methoxide solution, and blended for a variable number of time intervals of 10, 20, 30, 40, 50, and 60 minutes. After a 24-hour stay, the biodiesel is cleaned and separated from the centrifuge's water content. The biggest conversion, which was attained at 60°C with a reaction time of 60 minutes, was reported in the study's results. Utilizing a base catalyst in accordance with the second-order kinetics of the biodiesel transesterification reaction of multifeedstock oil.
A quad-cliff mechanism for eco-printing by pounding technique: design, manufacturing, and testing Triawan, Farid; Dyota, Arya Smara; Kamila, Fatima Tasya; Saptaji, Kushendarsyah; Fernandez, Nikolas Krisma Hadi; Silitonga, Arridina Susan; Sebayang, Abdi Hanra
Jurnal Polimesin Vol 22, No 5 (2024): October
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i5.5738

Abstract

Indonesia produces many types of textile products, such as clothing and custom fabrics often with unique patterns. To generate the patterns, there are many methods, including eco-printing by pounding process. However, the process, which was later referred to as eco-pounding, requires much time and energy, which can have a negative impact, such as musculoskeletal disorders, on the human body. To address this issue, the present work proposes a machine that can help the process of eco-pounding. Shigley’s method is applied to guide the design process of the machine. The design and manufacturing processes of the eco-pounding machine are presented, in which three machine design models are first introduced and then analyzed for finalization by benchmarking method. Subsequently, a machine model that uses a so-called quad-cliff mechanism is selected for manufacturing and testing. As a result, the proposed machine can achieve the design requirements that were set. Three pounding movements per second can be obtained by the machine, with possible increases by an engine upgrade. This machine can be considered a prototype for a semi-automatic eco-printing process by pounding technique.
The effect of the number of syn-gas purification nozzles of the water scrubber method on the characteristics of gasification combustion results Hanggara, Fuad Dwi; Yuliansyah, Fisal; Irawan, Dwi
Jurnal Polimesin Vol 22, No 5 (2024): October
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i5.5298

Abstract

The product of the gasification process contains several impurities, including tar, ash, CO2, and other contaminants. To achieve efficient syngas results, the syngas must undergo a filtration or purification process, which can increase its energy density. The purpose of this study was to determine the effect of the number of purification nozzles on the characteristics of the resulting flame, the duration of the flame produced during the gasification process, and the rate of heat absorption in the water generated from the syngas purification process. The water scrubber method employed in the syngas purification process utilizes an updraft gasification reactor. The biomass used in this study is rubber wood, with a venturi nozzle size of 0.15 mm and a pressure of 0.12 Pa. The tests varied the number of purification nozzles to 2, 3, and 4. The use of 4 nozzles had a significant effect on the combustion characteristics, resulting in a blue flame with a duration of 33 minutes. The configuration with 3 nozzles produced a flame that exhibited a mixture of blue and orange colors, with the blue flame being more dominant, lasting 38.2 minutes. In contrast, the configuration with 2 nozzles resulted in a bluish-red flame, predominantly red in color, with a duration of 45 minutes. The heat absorption rates in the water produced for the configurations with 2, 3, and 4 nozzles were measured at 539 J/s, 449.1 J/s, and 414.62 J/s, respectively.
Pre-design of bottom ash cooling using CFD simulation: a case study of the coal generator power plant in the PT. BEST Tanjung Enim of South Sumatera Ozkar F. Homzah; Ella Sundari; Muhammad Irfan Dzaky; Firdaus .; Fatahul Arifin; Damar Adji Prayoga; Kabul Andi Setiyadi; Kabul Kabul
Jurnal Polimesin Vol 22, No 6 (2024): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i6.4464

Abstract

The manual removal of bottom ash from the boiler is a hazardous activity due to the extremely high temperatures involved, ranging from 700 to 800°C. The objective of this research is to develop a cooling device to facilitate the bottom ash removal process for workers at PT. BEST Tanjung Enim and to measure the reduction in ash temperature achieved by cooling device. The design was created using computer aided design software and Computational Fluid Dynamics (CFD) simulations. Subsequently, a hypothesis is proposed, defining the bottom ash material as Silicon Dioxide (SiO₂) and equalizing the density of the bottom ash. To ascertain the temperature drop, variations in the screw conveyor’s rotation speed were tested at 40, 33, and 12 rpm, paired with cooling water velocities of 0.5, 0.75, and 1 m/s respectively. The findings of study indicated that a screw conveyor speed of 12 rpm combined with a cooling water velocity of 0.5 m/s yielded the lowest bottom ash temperature, reaching 402°C, thus significantly reducing the need for manual handling when the ash temperature remains at 800°C. Further study should explore the application of Discrete Element Method (DEM) simulations for modelling bulk material behaviour and the integration of additional cooling media to enhance system performance.
Ergonomic working posture analysis on highway construction work using the OWAS method Muhammad Arif Munanda; Mohd. Iqbal; M. Dirhamsyah
Jurnal Polimesin Vol 22, No 6 (2024): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i6.5530

Abstract

Road construction work has a high risk of injury due to nonergonomic work postures, such as hunched and twisted postures. Such injuries negatively impact workers’ health and can also lead to decreased productivity, higher medical costs, and delayed project completion. This study is important to conduct because of the lack of attention to ergonomics in the construction sector, especially in Indonesia, which results in an increased risk of work accidents and musculoskeletal injuries. Using the Ovako Working Posture Analysis System (OWAS), this study aims to analyze work postures in various road construction activities and identify work positions that have the potential to cause injury. The results of OWAS observations and analysis show that several main jobs, such as road construction (AC 4 = 63.6%), asphalt leveling with screws (AC 4 = 78.6%), and narrow side casting (AC 3 = 21.4%; AC 4 = 42.9%), have a high risk of poor posture. This study suggests ergonomic interventions such as posture training and the use of heavy equipment to reduce the risk of injury and improve work efficiency. The conclusion of this study is expected to provide an overview of the postural distribution of road construction workers, as well as identify the riskiest work postures, so that effective recommendations can be proposed to improve work safety and productivity.
Shear strength comparison of single lap and joggle lap adhesive joints in carbon fiber composites manufactured via vacuum-assisted resin infusion Pratama, Mikhael Gilang Pribadi Putra; Abdurohman, Kosim; Pratomo, Rezky Agung; Hidayat, Ryan; Ramadhan, Redha Akbar; Aritonang, Rian Suari; Nurtiasto, Taufiq Satrio; Ardiansyah, Riki; Nugroho, Afid; Nuranto, Awang Rahmadi; Wandono, Fajar Ari; Targani, Dudi; Ula, Nur Mufidatul
Jurnal Polimesin Vol 22, No 5 (2024): October
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i5.5437

Abstract

The extensive utilization of composite materials has spurred the advancement of diverse joining techniques suitable for components constructed from such materials. This study focuses on the examination of two specific types of joints: single lap and joggle lap joints. The specimens utilized were composed of unidirectional carbon fiber composite combined with vinyl ester resin, manufactured via the vacuum-assisted resin infusion method. Vinyl ester adhesives were employed in the bonding process, with the joint surfaces undergoing sanding treatment prior to testing. Mechanical testing was conducted on the specimens according to ASTM D5868 standard, employing a constant crosshead speed until failure occurred. The test results reveal that the shear strength of single lap joints surpasses that of joggle lap joints. Within the single lap joint configuration, a mixed failure mode comprising both adhesive and cohesive failure is observed. Conversely, in joggle lap joints, substrate delamination is prevalent, suggesting the predominance of peel stress during loading.

Page 37 of 51 | Total Record : 503

 35   36   37   38   39 

Filter by Year

2003 2025


Reset
Filter By Issues
All Issue Vol 23, No 5 (2025): October Vol 23, No 4 (2025): August Vol 23, No 3 (2025): June Vol 23, No 2 (2025): April Vol 23, No 1 (2025): February Vol 22, No 6 (2024): December Vol 22, No 5 (2024): October Vol 22, No 4 (2024): August Vol 22, No 3 (2024): June Vol 22, No 2 (2024): April Vol 22, No 1 (2024): February Vol 21, No 6 (2023): December Vol 21, No 5 (2023): October Vol 21, No 4 (2023): August Vol 21, No 3 (2023): June Vol 21, No 2 (2023): April Vol 21, No 1 (2023): February Vol 20, No 2 (2022): August Vol 20, No 1 (2022): February Vol 19, No 2 (2021): Agustus Vol 19, No 1 (2021): February Vol 18, No 2 (2020): Agustus Vol 18, No 1 (2020): Februari Vol 17, No 2 (2019): Agustus Vol 17, No 1 (2019): Februari Vol 16, No 2 (2018): Agustus Vol 16, No 1 (2018): Februari Vol 15, No 2 (2017): Agustus Vol 15, No 1 (2017): Februari Vol 14, No 2 (2016): Agustus Vol 14, No 1 (2016): Februari Vol 9, No 1 (2011): Februari Vol 8, No 2 (2010): Agustus Vol 8, No 1 (2010): Februari Vol 7, No 2 (2009): Agustus Vol 7, No 1 (2009): Februari Vol 6, No 2 (2008): Agustus Vol 3, No 2 (2005): Agustus Vol 2, No 1 (2004): Februari Vol 1, No 1 (2003): Agustus More Issue