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Hasanuddin, Iskandar
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Fabrication and mechanical characterization of binderless boards from sugarcane bagasse fibers Hasanuddin, Iskandar; Faurantia, Faurantia; Mawardi, Indra
Jurnal Polimesin Vol 23, No 2 (2025): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i2.6078

Abstract

Agricultural   waste  management  is  a  pressing  environmental concern, as traditional disposal methods like incineration contribute to pollution. This study explores the fabrication and evaluation of binderless boards made from sugarcane bagasse fibers, eliminating the need for synthetic binders. Bagasse fibers were processed at mesh sizes of 20 and 40, then hot-pressed at 190°C under 9.6 MPa pressure for 15 and 25 minutes, achieving a targeted thickness of 10 mm. The physical and mechanical properties, including density, water absorption, thickness swelling, Modulus of Rupture (MOR), and Modulus of Elasticity (MOE), were analyzed. Results showed that particle size and pressing time significantly influenced board properties. The highest performance was  observed in  the  E25 sample (40-mesh, 25-minute pressing), with  a  density of  0.52 g/cm³, MOR of 2.69 MPa, MOE of 293.82 MPa, water absorption of 134.66%, and thickness swelling of 16.80%. These findings suggest that optimizing particle size and pressing conditions enhances binderless board strength and dimensional stability, making sugarcane bagasse a viable raw material for sustainable panel production.
Investigating the Effects of Solution Treatment Parameters and Artificial Aging on Hardness Improvement of Precipitation-Hardened 6061 Aluminum Alloy Yunus, Azwar; Akhyar, Akhyar; Hasanuddin, Iskandar; Sasmito, Agus
Jurnal Polimesin Vol 23, No 4 (2025): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i4.7076

Abstract

This study investigates the impact of solution treatment parameters such as temperature, holding time, and quenching media on the hardness enhancement of wrought aluminum alloy 6061-T6 through precipitation hardening. The objectives of this research are to analyze the influence of solution treatment parameters on hardness enhancement, explore the correlation between the solutioning step and the artificial aging process, and optimize the heat treatment process for improved hardness values. Specimens of 6061-T6 aluminum alloy initially exhibited a hardness of 102 HV. After heating to 500°C with holding times of 45, 60, and 75 minutes, followed by quenching in water and SAE 40 oil, Vickers hardness testing revealed significant changes: hardness dropped to 52 HV after solution treatment, then increased to 63 HV (21.15% increase) for 60 minutes and 64 HV (23.08% increase) for 75 minutes. After artificial aging at 210°C for 120, 180, and 240 minutes, the maximum hardness recorded was 113 HV, marking a 10.78% increase from the initial hardness. The quenching medium also influenced hardness; specimens quenched in SAE 40 oil showed improved hardness compared to those quenched in water, likely due to slower cooling rates that allow for better precipitate formation. The increase in hardness is closely linked to microstructural changes during heat treatment. Solution treatment promotes the dissolution of alloying elements, leading to the formation of fine precipitates during aging. These precipitates impede dislocation movement, enhancing the alloy's strength through precipitation hardening. Thus, the density and distribution of these precipitates significantly contribute to the overall hardness enhancement observed in the 6061-T6 aluminum alloy
The Simulation Of Drop-Weight Impact Test On Ramie-Eglass Hybrid Fiber Composite For Jaloe Kayoh Wall Material Tamlicha, akram; Rizal, Samsul; Hasanuddin, Iskandar; Noor, Muhamad Mat; Ikramullah, Ikramullah; Nazaruddin, Nazaruddin
Jurnal Polimesin Vol 22, No 1 (2024): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i1.4645

Abstract

The purpose of this study is to simulate drop-weight impact tests on hybrid fibre composites made of ramie and Eglass, which are used to make the traditional Acehnese boat wall material for jaloe kayoh. Using composites of ramie-Eglass fiber hybrid in the construction of jaloe kayoh wall material will significantly enhance the strength, durability, and sustainability of traditional Acehnese boats. The simulation was carried out using the finite element method approach using the Abaqus software. Three distinct laminate layer configurations—three layers (GRG), five layers (GRGRG), and six layers (GRGGRG)—with alternating Eglass and ramie fibres make up the test specimens. The ends of the specimen are set with fixed support to ensure boundary conditions, which limit all active structural degrees of freedom on all sides of the specimen. According to simulation results, the specimen with six laminate layers, measuring 12.498 mm, had the largest displacement. The specimen with six laminate layers has the highest stress concentration, measured at 560.6 MPa, while the specimen with three layers has the highest strain concentration, measured at 0.023. Its indicating that the lamina variation can influence the structural performance of the jaloe kayoh material. This research contributes to understanding the potential of ramie-Eglass hybrid fiber composites to enhance the safety and durability of traditional vessels such as jaloe kayoh. The implications of the results can serve as a foundation for the development of superior structural materials in the future.
Analysis of worker posture of Make-Up Artist by Standard Nordic Questionnaire method and Rapid Entire Assessment Asda, Cut Lirma Saputri; Hasanuddin, Iskandar; Husni, Husni; Firsa, Teuku
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.v22i6.5583

Abstract

Working posture is one of the factors that can influence work productivity because working with an abnormal posture can cause ergonomic problems, especially muscle injuries in workers. This research aims to analyze the worker posture of Make-up Artists (MUA) in Meukek District, South Aceh Regency. The analysis was carried out using the (SNQ) method to identify musculoskeletal complaints and (REBA) with the help of Ergo fellow software to assess worker posture. The research results   showed   that   as   many   as   80%   of   MUA   workers experienced complaints of musculoskeletal, with the most frequent complaints in the waist, shoulders, and neck. The work posture score of MUA workers is categorized as high risk (REBA score 11) in several activities, such as when cleaning the face and applying eyelashes. Risk factors that cause unergonomic work postures include long work duration (2-3 hours per client), with dynamic body positions. Lack of ergonomic work facilities. Based on the research results, several solutions are recommended to improve MUA work posture, including providing solutions for good body posture when working and designing ergonomic work chairs so that they can help MUA maintain optimal body posture while working and reduce risk musculoskeletal. By having work chairs that suit the design, it is hoped that it can improve the comfort and health of MUA workers and reduce the complaints they have been experiencing.
Effect of Perforated Aluminum on Calotropis Gigantea Fiber Material’s Ability to Absorption Sound suhaeri, suhaeri; Husaini, Husaini; Dirhamsyah, Muhammad; Hasanuddin, Iskandar
Jurnal Polimesin Vol 22, No 4 (2024): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i4.5245

Abstract

Plants fibers such as Calotropis gigantea (CG) are very suitable as noise reduction material. Therefore, this research aims to determine the sound absorption coefficient of CG in the 20 mm test sample and the effect of the perforated aluminum layer on its ability. It was carried out using a test sample made with a thickness of 20 mm and 100 mm in diameter. The thickness of aluminum was 0.3 mm with hole diameters of 1 mm, 1.5 mm, and 2.5 mm. During the experiment, every sample was heated and pressed in a mold for 10 minutes at 200oC. The test equipment used is a Bruel Kjaer Type 4206 impedance tube with 100 mm in diameter. The sample was tested using the transfer function method ISO 10534-2:1998 at a frequency of 1/1 octave. The results indicated that the uncoated sample absorbed noise α = 0.01-0.07 (1-7)% higher than the sample coated with perforated aluminum. This showed that the Noise Reduction Coefficient (NRC) without aluminum coating can reduce noise by 29%, and the measured sample is categorized in class D.
Effect of Scirpus grossus fiber density on acoustic absorption characteristics for insulation use Suhaeri, Suhaeri; Husaini, Husaini; Dirhamsyah, Muhammad; Hasanuddin, Iskandar; Tajuddin, Tajuddin
Jurnal Polimesin Vol 23, No 3 (2025): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i3.7012

Abstract

Noise control is essential for achieving comfortable living and working environments. Natural fibers such as Scirpus Grossus offer a sustainable approach for sound absorption applications. This study investigates the effect of varying fiber densities of Scirpus grossus on sound absorption performance. Test specimens were fabricated at three density levels; 636.9 kg/³, 318.5 kg/m³, and 212.3 kg/m³. Each had a fixed mass of 50 grams, a diameter of 100 mm, and varying thicknesses of 10 mm, 20 mm, and 30 mm. The samples were hot-pressed at 200°C for 10 minutes. Sound absorption coefficients (SACs) were measured using a Brüel Kjær Impedance Tube Type 4206, following the transfer function method (ISO 10534-2:1998) over third-octave bands. The results show that fiber density significantly affects the sound absorption coefficient (SAC). A decrease in density to 212.3 kg/m³ led to a SAC increase of 0.12 points (approximately 20% relative to the initial SAC value of 0.5428 at 636.9 kg/m³), particularly at 4000 Hz. This indicates that lower-density samples exhibit better acoustic absorption behavior. The average Noise Reduction Coefficient (NRC) across all samples was around 45%, confirming their effectiveness in sound control. Based on SAC values, the samples are classified as Sound Absorption Class D. These findings suggest that Scirpus grossus fiber mats have strong potential for eco-friendly acoustic insulation materials, suitable for applications in building panels or vehicle interiors.
STUDI KONVERGENSI MESH PADA RESPONS HANCUR NUMERIK STRUKTUR SANDWICH HONEYCOMB Kamil, Syahiir; Machmud, M. Nizar; Hasanuddin, Iskandar; Sabri, Faris Ahmad Mizanus; Adlie, Taufan Arif; Arif, Zainal
JURNAL CRANKSHAFT Vol. 9 No. 1 (2026): Jurnal Crankshaft Vol. 9 No. 1 (2026)
Publisher : Badan Penerbit Universitas Muria Kudus

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24176/cra.v9i1.16831

Abstract

In this research, finite element methods are utilized to investigate the mechanical behavior of aluminium honeycomb sandwich structures under out-of-plane compression. The structures were virtually compressed from the initial elastic regime until the plateau phase using explicit non-linear analysis modelling approaches. A mesh convergence study is conducted to ensure the accuracy and reliability of the simulation results, aiming to determine the optimal mesh size that balances precision with computational efficiency. An analytical equation for calculating the plateau force, or average crush load, along with experimental data from the study by Mertani, is used to validate the numerical results. The study concludes that a mesh size of 0.5 mm offers an ideal balance between accuracy and computational cost, yielding an error of 3.1%.
Design and implementation of a state feedback controller for enhanced speed stability of permanent magnet DC motors under load variations Syukri, Mahdi; Lubis, Rakhmad Syafutra; Melinda, Melinda; Syukur, Muhammad Hakkan; Hasanuddin, Iskandar; Irwanto, Muhammad
Jurnal Polimesin Vol 24, No 2 (2026): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i2.8379

Abstract

This study presents the design and simulation of a State Feedback Controller (SFC) for speed regulation of a Permanent-Magnet DC (PMDC) motor using a state-space modeling approach. The objective is to achieve stable and accurate speed control under dynamic load disturbances that typically degrade the performance of conventional open-loop systems. The Direct Current (DC) motor is modeled in state-space form, with armature current and angular speed selected as the main system states. Controller gains are designed using the pole placement method to ensure fast response and improved stability. The proposed SFC is evaluated through MATLAB®/Simulink® simulations by examining motor speed, armature current, and input voltage responses under step-load variations. Simulation results show that the SFC maintains the motor speed at the reference value of 3,430 rpm even during sudden load increases, whereas the uncontrolled motor experiences significant speed drops and oscillations. Performance analysis confirms notable improvements in transient response. The rise time is reduced from 1.1864 s to 0.4220 s, and the settling time decreases from 2.1132 s to 0.7517 s, indicating faster and more stable system behavior. In addition, smoother current transitions and more efficient voltage regulation are achieved compared to the open-loop configuration. Overall, the results demonstrate that state-space control using pole placement provides a robust and responsive alternative to conventional PID controllers for DC motor speed control under load disturbances. Future work will focus on experimental validation and the exploration of advanced control strategies such as Linear Quadratic Regulation and adaptive control.
Co-Authors . Zulfan Agus Sasmito, Agus Ahmad Farhan, Ahmad Ahmadiar, Ahmadiar Akhyar Akhyar Akhyar Andriansyah Andriansyah Arif, Zainal Arifin, Riski Asda, Cut Lirma Saputri Asmadi, Didi Azizah, Nadiatul Baehaqi Dirhamsyah, Muhammad Edhy, Sarwo Faurantia, Faurantia Firsa, Teuku Fitriadi Fitriadi Herawati, Rama Hidayaturrahmi, Hidayaturrahmi Husaini Husaini Husaini Husni Husni Iing Pamungkas Ikramullah, Ikramullah Indra Mawardi Iqbal, MT, Mohd Irawan, Heri Tri Irwanto, Muhammad Kamil, Syahiir Khairah, Alfita Khairil Khairul Hadi Lubis, Rakhmad Syafutra Lulusi Lulusi M. Dirhamsyah M. Nizar Machmud Mahdi Syukri Medyan Riza Melinda Melinda Melinda Miftahujjannah, Rizka Mohammad Iqbal Mutia Mutia, Mutia N. Nazaruddin Nasaruddin Nasaruddin Noor, Muhamad Mat Raden Mohamad Herdian Bhakti Ratna Sary Rudi Salam Rudiansyah Putra Sabri, Faris Ahmad Mizanus Sofyan, Sarwo Edhy Suhaeri Suhaeri, Suhaeri Syahriza, Syahriza Syukur, Muhammad Hakkan Tajuddin Tajuddin, Tajuddin Tamlicha, Akram Udink Aulia Yunus, Azwar Yusria Darma Yuwaldi Away Zulfan