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All Journal J@TI (TEKNIK INDUSTRI) Jurnal Ilmiah Desain & Konstruksi Tengkawang : Jurnal Ilmu Kehutanan SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Dinamika Teknik Mesin : Jurnal Keilmuan dan Terapan Teknik Mesin JURNAL DINAMIKA VOKASIONAL TEKNIK MESIN Machine : Jurnal Teknik Mesin PRODUCTUM : Jurnal Desain Produk (Pengetahuan dan Perancangan Produk) Jurnal Teknik Mesin Indonesia Infotekmesin Journal of Industrial Engineering Otopro Reswara: Jurnal Pengabdian Kepada Masyarakat Quantum Teknika Jurnal Kreatif : Desain Produk Industri dan Arsitektur REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development Jurnal Senopati : Sustainability, Ergonomics, Optimization, and Application of Industrial Engineering Jurnal Teknologi dan Manajemen Jurnal Polimesin Jurnal Industri Furnitur dan Pengolahan Kayu (JIFKA) Majalah Teknik Mesin
Bahtiar Rahmat
Politeknik Industri Furnitur Dan Pengolahan Kayu
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Anthropometric-Based Ergonomic Assessment of Student Chairs to Prevent Musculoskeletal Discomfort Fitrianto, Taufik Ramadhan; Rahmat, Bahtiar; Anggiriani, Siska; Mulyosari, Desy; Nurhanifah, Nurhanifah; Nugroho, Alfani Risman; Affandi, Muhammad Afif
Jurnal SENOPATI : Sustainability, Ergonomics, Optimization, and Application of Industrial Engineering Vol 7, No 2 (2026): Jurnal SENOPATI Vol 7, No 2 (in progress)
Publisher : Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.senopati.2026.v7i2.8302

Abstract

Many students at Politeknik Industri Furnitur dan Pengolahan Kayu have reported musculoskeletal discomfort after prolonged sitting in classroom chairs, including lower back pain, neck stiffness, and shoulder tension. These complaints suggest that the existing chairs may not accommodate users’ anthropometric characteristics. This study aimed to evaluate the ergonomic compatibility of current student chairs and to redesign their dimensions based on anthropometric data to meet both national and international ergonomic standards. The research was conducted through three main stages: (1) identifying discomfort areas using the Nordic Body Map (NBM) questionnaire, (2) collecting key body measurements from male and female students, and (3) performing a mismatch analysis between anthropometric dimensions and chair parameters. The analysis revealed a high level of mismatch—particularly in seat height, depth, and backrest dimensions—which correlated with the prevalence of MSD complaints. A redesigned chair model was then proposed based on student anthropometry and evaluated against available standards. The redesigned dimensions significantly reduced mismatch rates for both male and female users, indicating improved ergonomic compatibility. Alignment with international standards further supports the potential of this design to enhance comfort and reduce musculoskeletal risks. However, despite its functional improvements, the new chair proportions may appear less visually balanced, necessitating further refinement in aesthetic and structural aspects before implementation.
Effects of depth of cut and feed rate on dimensional accuracy and surface roughness in CNC nesting of HMR panels Purwanto, Agung Ari; Amarta, Zain; Rahmat, Bahtiar; Widiyanto, Wahyu; Fahrudin, 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.v24i2.8800

Abstract

The rapid adoption of digital manufacturing and smart CNC machining in furniture production has made the optimization of machining parameters for engineered wood panels increasingly important. High Moisture Resistance (HMR) panels are widely used because of their superior moisture resistance compared with Medium Density Fiber board (MDF). However, studies on CNC machining performance of HMR panels remain limited, particularly regarding dimensional accuracy and surface roughness. This study evaluates the effects of depth of cut and feed rate in CNC nesting on dimensional accuracy and surface quality of HMR panels. Four machining combinations were tested using depths of cut of 2 and 4 mm and feed rates of 33 and 66 mm/s, with three replications for each treatment. Specimen dimensions and average surface roughness (Ra) were measured after machining. The results show that depth of cut significantly affected dimensional accuracy, while feed rate significantly influenced surface roughness. The interaction between depth of cut and feed rate was not significant for specimen length, but was significant for specimen width and roughness. Optimal dimensional accuracy and surface quality were achieved using the lowest depth of cut (2 mm) in conjunction with the lowest feed rate (33 mm/s).
Uji pembebanan statik meja kerja kantor dengan konstruksi pen-lubang dan alur-isian Bahtiar Rahmat; Taufik Ramadhan Fitrianto; Desy Mulyosari; Nurhanifah Nurhanifah; Siska Anggiriani; Anshah Silmi Afifah
Productum: Jurnal Desain Produk (Pengetahuan dan Perancangan Produk) Vol 9, No 1 (2026)
Publisher : Institut Seni Indonesia Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24821/productum.v9i1.17612

Abstract

An ergonomic work environment requires furniture to be compatible with the dimensions of the user's body in order to avoid musculoskeletal complaints and decreased productivity. A data-driven anthropometric design approach combined with structural simulation is a strategy to ensure both comfort and strength of the product. This study applies the Finite Element Method (FEM) to analyze the strength of a work table with a hole-and-groove construction before mass production. A combination of mahogany and plywood was chosen for cost efficiency, while the strength of the joints between components was the main focus of the evaluation. The simulation process included 3D modeling, material selection, boundary condition determination, loading in accordance with SNI 8781-2019, meshing, and analysis of results. The desk measured 1200×600×750 mm with four fixed support points on the legs. The results showed good structural performance in all tests. Stability and vertical strength tests showed that the stress and displacement were below the elastic limit of the material. Fatigue tests showed a damage level of only 1 percent, while drop tests resulted in a displacement of 1.55 mm without permanent deformation. Overall, the table design was deemed safe, stable, and suitable for production.
EXPERIMENTAL STUDY ON OTTO ENGINE PERFORMANCE WITH VARIATIONS IN COMPRESSION RATIO AND GASOLINE OCTANE Bahtiar Rahmat; Irwan Setyo Prabowo; Yuris Bahadur Wirawan; Fahmy Zuhda Bahtiar
Otopro Vol 21 No 2 May 2026
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/otopro.v21n2.p60-68

Abstract

This research aims to analyze the effect of compression ratio variation and gasoline octane number on the performance of spark-ignition internal combustion engines. The experimental object was a single-cylinder 124 cc motorcycle engine with an original compression ratio of 9.6:1. The compression ratio was increased to 10.6:1 by reducing the cylinder height by 0.6 mm. Performance testing was carried out using a dynamometer with two types of fuel, RON 88 and RON 92. Octane number 92 was selected based on fuel availability, while octane number 88 was used to evaluate engine performance under an increased compression ratio. A cylinder wall length reduction of 0.6 mm was applied as the maximum allowable limit, beyond which cylinder head modification would be required. The performance parameters evaluated were torque and brake power over an engine speed range of 4000–7000 rpm. The results indicate that increasing the compression ratio from 9.6:1 to 10.6:1 improved engine torque and brake power by approximately 3.8% to 4%. Meanwhile, the use of higher-octane gasoline (RON 92) increased performance by only about 2% to 2.4%, and only when used in the higher compression engine. In contrast, using high-octane fuel in a low-compression engine resulted in reduced performance due to ignition delay. Overall, the optimal performance was achieved when a high compression ratio was paired with high-octane fuel. Therefore, selecting an appropriate octane rating according to the engine compression ratio is essential to achieve optimal combustion efficiency, brake power output, and torque response.
Co-Authors Affandi, Muhammad Afif Amarta, Zain Anshah Silmi Afifah Anshah Silmi Afifah Arip Wijayanto Bahtiar, Fahmy Zuhda Desy Mulyosari Desy Mulyosari Dhian Juwitasari F.Z. Bahtiar Fahmy Zuhda Bahtiar Fahrudin, Muhammad Fitrianto, Taufik Ramadhan Galih Prakoso Galih Prakoso, Galih Gilang Putra Paristiono Irwan Setyo Prabowo Katiko Imamul Muttaqin M.B.R. Wijaya Ma'wa, Safarah Putri Mohammad Burhan Rubai Wijaya Mohammad Burhan Rubai Wijaya Muhamad, Soleh Mulyosari, Desy Muttaqin, Katiko Imamul Nugroho, Alfani Risman Nurhanifah Nurhanifah Nurhanifah Nurhanifah Nurmadina Nurmadina Nurmadina, Nurmadina Purwanto, Agung Ari Siska Anggiriani Soleh Muhamad Syauqi Darmapratama Taufik Ramadhan Fitrianto Wahyu Widiyanto Wijaya , Mohammad Burhan Rubai Wijaya, Mohammad Burhan Rubai Y.B. Wirawan Yessi Nasia Ulfia Yuris Bahadur Wirawan Yuris Bahadur Wirawan Yuris Bahadur Wirawan Yuris Bahadur Wirawan, Yuris Bahadur