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KOLECER: Scientific Journal of Mechanical Engineering
Published by Universitas Pasundan
ISSN : -     EISSN : 31090745     DOI : https://doi.org/10.23969/ksjme
Core Subject : Science, Engineering,
Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering
KOLECER Scientific Journal of Mechanical Engineering is an academic journal published by the Mechanical Engineering Department, Universitas Pasundan, dedicated to disseminating research findings conducted by lecturers, students, and researchers. The published articles are expected to serve as references and contribute to the advancement of science and technology. This journal focuses on the field of Mechanical Engineering, covering the following areas: - Materials and Manufacturing - Mechanical System Design and Development - Thermal and Fluid Engineering KOLECER Scientific Journal of Mechanical Engineering is published twice a year, in March and September. Each issue features a minimum of five articles. Manuscripts may be written in English or proper Indonesian, following the Indonesian Language Standardization (PUEBI).
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 18 Documents
 1   2 
Pengaruh variasi kecepatan putaran spindle frais milling terhadap sifat kekasaran alumunium 6061 Firmansyah, Mochammad; Wati, Dian Anisa Rokhmah; Pramitasari, Retno Eka; Wijanarko, Nadia Parwaty
KOLECER Scientific Journal of Mechanical Engineering Vol. 1 No. 2 (2025): September 2025
Publisher : Program Studi Teknik Mesin Fakultas Teknik Universitas Pasundan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23969/ksjme.v1i2.30720

Abstract

This research aims to determine the roughness level of a 6061 aluminium workpiece by varying the spindle rotation speed in the milling machine. The results of this study are data on surface roughness obtained through variations in spindle rotation speed during milling. This research uses experimental research methods. Methods that aim to test the effect of a variable on other variables or test the causal relationship between one variable and other variables. The results of this study are presented as roughness test results. The test results using spindle rotation n_1  = 410 rpm; n_2 = 570 rpm; n_3  = 660 rpm. The lowest roughness value occurs at spindle rotation n_3 = 660 rpm, producing an average roughness value of 0.697 µm. The highest roughness value occurs at a spindle rotation of n_1 = 410 rpm, yielding an average roughness of 2.164 µm. Testing at 660 rpm yields smoother results than at 570 rpm and 410 rpm.
Kalibrasi dan analisis ketidakpastian pengukuran sensor temperatur DHT22 menggunakan termometer digital terkalibrasi sebagai alat referensi Sandia Yudha, Viki; Supriyono, Toto; Ghani M, Januar; Rizky Ferdiansyah, Yusuf; Ramadani; Mardiawan, Fajri; Fatah Al Munawar, Rafli
KOLECER Scientific Journal of Mechanical Engineering Vol. 1 No. 2 (2025): September 2025
Publisher : Program Studi Teknik Mesin Fakultas Teknik Universitas Pasundan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23969/ksjme.v1i2.39427

Abstract

The DHT22 digital temperature sensor is widely used in environmental monitoring, building automation, and Internet of Things (IoT) applications due to its low cost and ease of integration. However, its measurement accuracy and precision are limited by manufacturing variability, environmental conditions, and component ageing, which can lead to systematic errors. Therefore, calibration accompanied by measurement uncertainty analysis is required to ensure reliable temperature data. In this study, a DHT22 temperature sensor was calibrated using a calibrated digital thermometer as a reference instrument through a direct comparison method at several temperature points within the sensor’s operating range. Linear regression was applied to derive a correction equation, while measurement error and Type A and Type B uncertainties were evaluated to determine the combined measurement uncertainty. The results show that, before calibration, the DHT22 sensor exhibited a temperature-dependent bias, with errors exceeding 1 °C at medium to high temperatures. The application of the regression-based correction significantly reduced measurement errors and improved agreement with the reference values, as indicated by a high coefficient of determination (R² = 0.998). The combined measurement uncertainty was found to lie within a moderate accuracy range and to increase with temperature, with dominant contributions from measurement repeatability and reference instrument uncertainty. Consequently, the calibrated DHT22 sensor can be more reliably employed in environmental temperature measurement applications requiring moderate accuracy.
Analisis perpindahan panas dan konversi energi pada sistem air conditioner tipe split Wati, Dian Anisa Rokhmah; Wasono, Jami’ul Adi
KOLECER Scientific Journal of Mechanical Engineering Vol. 1 No. 2 (2025): September 2025
Publisher : Program Studi Teknik Mesin Fakultas Teknik Universitas Pasundan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23969/ksjme.v1i2.39518

Abstract

Split-type air conditioning systems are widely used to meet thermal comfort requirements, particularly in tropical regions. The performance of these systems is strongly influenced by the mechanisms of heat transfer and energy conversion occurring during the refrigeration cycle. This study analysed the heat transfer processes and energy conversion mechanisms in a split-type air conditioning system under actual operating conditions. A descriptive–analytical method with a case study approach was employed, involving direct observation, measurement of operational parameters, and technical interviews. The observed parameters included refrigerant temperature and pressure, as well as the performance of the primary refrigeration components, namely the evaporator, compressor, condenser, and expansion valve. The results indicate that cooling in a split-type air conditioner is achieved by transferring thermal energy from indoor air to the outdoor environment, with the assistance of electrical energy converted into mechanical work by the compressor. Each system component was found to play an interdependent role in determining heat transfer effectiveness and overall energy conversion efficiency. Stable operating conditions of refrigerant pressure and temperature were observed to influence system performance significantly. This study provides a comprehensive understanding of the operational characteristics of split-type air conditioning systems from the perspective of heat transfer and energy conversion. It may serve as a basis for improving energy efficiency and optimising air conditioning system performance.
Perancangan distribusi air bersih (plumbing) di villa permanen Wayang Windu
KOLECER Scientific Journal of Mechanical Engineering Vol. 2 No. 1 (2026): March 2026
Publisher : Program Studi Teknik Mesin Fakultas Teknik Universitas Pasundan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23969/ksjme.v2i1.5261

Abstract

Air bersih adalah kebutuhan dasar yang bagaimanapun sulit dipisahkan dari kehidupan sehari-hari, maka untuk itu ketersediaannya amatlah sangat penting. Banyak cara yang digunakan dalam penyediaan air bersih, salah satunya yaitu dengan menggunakan jaringan perpipaan atau sistem perpipaan. Pada kenyataannya, pendistribusian air bersih selalu terjadi permasalahan yang mana tidak sesuainya kebutuhan air pada masing-masing keluaran, biasanya disebabkan tidak sesuai dengan jumlah penghuni atau dengan perancangan pada bangunan tersebut. Untuk itu salah satu upaya yang dilakukan yaitu merancang  distribusi air bersih dengan menggunakan software Epanet 2.0 dengan studi kasus di villa permanen Wayang Windu. Merancang distribusi air bersih dimulai dari menghitung kebutuhan air bersih di setiap bangunan yang mengacu pada SNI 03-7065-2005. Selanjutnya menghitung kapasitas peralatan yang dibutuhkan pada sistem distribusi air, merancang sistem jaringan pipa, dan melakukan perhitungan dalam perancangan distribusi air bersih menggunakan software Epanet 2.0 dengan batasan kecepatan yang mengacu pada API RP 14E. Dari hasil perhitungan yang telah dilakukan berdasarkan metode jumlah penghuni, besarnya kebutuhan air bersih di villa permanen Wayang Windu sebesar 42,179 m3/d. Lalu setelah dilakukan simulasi jaringan pipa yang telah dirancang menggunakan software Epanet 2.0, jaringan tersebut mampu melayani kebutuhan air bersih setiap bangunan sesuai perhitungan, akan tetapi kriteria desain yang ada pada jaringan pipa tersebut masih belum memenuhi standar yang ditentukan oleh API RP 14E yaitu kecepatan aliran yang masih lebih rendah dari 0,9 m/s pada kebanyakan pipa.
Analisis pengaruh beban siklis terhadap fatigue dan deformasi baling-baling drone menggunakan metode elemen hingga
KOLECER Scientific Journal of Mechanical Engineering Vol. 2 No. 1 (2026): March 2026
Publisher : Program Studi Teknik Mesin Fakultas Teknik Universitas Pasundan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23969/ksjme.v2i1.42076

Abstract

This study aims to analyze the fatigue and deformation of drone propellers made of carbon fiber using the Finite Element Method (FEM) through ANSYS simulation. The applied loads include the drone weight of 3.6 kg and additional loads of 0.5 kg and 0.75 kg, distributed evenly across six propellers. Simulation results indicate that the propellers’ fatigue life remains within a safe range, with a maximum time of approximately 107 s, although the propeller tips are critical areas with the lowest safety factor, indicating a higher risk of failure. The deformation distribution shows that the middle section of the propeller remains relatively safe under load, while the tips experience stress concentration due to combined loads and airflow interaction. This study provides a basis for reinforcing critical areas of the propeller design and recommends further research to evaluate the effects of propeller shape variations and more complex flight conditions. The results are expected to enhance the fatigue life and operational safety of carbon fiber drone propellers.
Effect of TIG welding current variation on the tensile strength of stainless steel 304 welded joints
KOLECER Scientific Journal of Mechanical Engineering Vol. 2 No. 1 (2026): March 2026
Publisher : Program Studi Teknik Mesin Fakultas Teknik Universitas Pasundan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23969/ksjme.v2i1.44002

Abstract

This study investigates the effect of TIG welding current variation on the tensile strength characteristics of stainless steel 304 welded joints. The research is motivated by the need to optimise welding parameters to ensure reliable mechanical performance and minimise variability in welded structures used in industrial applications. Inadequate control of welding current may lead to unstable heat input, affecting weld penetration, microstructural homogeneity, and joint strength. Therefore, this study aims to evaluate the influence of welding current on tensile performance through an experimental and statistical approach. Welding was conducted at two current levels, 115 A and 125 A, followed by tensile testing in accordance with ASTM E8 standards. Statistical analyses, including descriptive statistics and one-way ANOVA, were applied to assess the significance of current variation. The results indicate that the average tensile strength increased from 28.33 MPa at 115 A to 42.87 MPa at 125 A, with reduced data variability at higher current. ANOVA confirmed a significant effect of welding current (p < 0.05). These findings suggest that higher heat input within an optimal range improves weld integrity and mechanical consistency. The study concludes that appropriate current selection enhances joint reliability, offering practical implications for welding parameter optimisation and future research on microstructural and process parameter interactions
Rancang bangun mesin pemotong adonan kerupuk untuk industri rumah tangga berkapasitas 78 kg/jam menggunakan motor listrik 1/6 HP
KOLECER Scientific Journal of Mechanical Engineering Vol. 2 No. 1 (2026): March 2026
Publisher : Program Studi Teknik Mesin Fakultas Teknik Universitas Pasundan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23969/ksjme.v2i1.44251

Abstract

Dalam kegiatan industri kecil, penggunaan peralatan mekanis berperan penting dalam meningkatkan efisiensi dan produktivitas proses produksi. Pada industri rumah tangga kerupuk, proses pemotongan adonan masih dilakukan secara manual sehingga memerlukan waktu yang lama dan menghasilkan kapasitas produksi yang terbatas. Kerupuk merupakan produk makanan kering berbahan dasar tepung tapioka yang dicampur dengan tepung terigu dan bumbu seperti garam, monosodium glutamat, ketumbar, bawang putih, serta pewarna makanan. Adonan yang telah dicampur air kemudian dikukus selama 10–15 menit, dikeringkan sebagian, dipotong, dan selanjutnya digoreng pada suhu tertentu. Permasalahan utama yang diidentifikasi adalah rendahnya efisiensi pada tahap pemotongan adonan. Oleh karena itu, penelitian ini bertujuan merancang dan membangun mesin pemotong adonan kerupuk untuk meningkatkan kapasitas produksi dan efisiensi waktu. Mesin yang dirancang menggunakan motor listrik 1/6 HP dengan putaran 2850 rpm dan sistem transmisi pulley dengan perbandingan 1:1 sehingga menghasilkan putaran poros pemotong sebesar 180 rpm. Mekanisme pemotongan bekerja melalui kontak langsung antara mata pisau dan adonan dengan memanfaatkan gaya gesek untuk menghasilkan potongan yang seragam. Hasil pengujian menunjukkan bahwa mesin mampu mencapai kapasitas pemotongan sebesar 1,3 kg/menit atau setara dengan 78 kg/jam. Mesin ini dirancang untuk dapat beroperasi secara kontinu dengan sistem pemeliharaan yang baik sehingga layak diterapkan pada industri rumah tangga guna meningkatkan produktivitas dan efisiensi proses produksi
Pengembangan alat sangrai biji kopi sistem rotary drum berbasis gas burner untuk peningkatan efisiensi produksi
KOLECER Scientific Journal of Mechanical Engineering Vol. 2 No. 1 (2026): March 2026
Publisher : Program Studi Teknik Mesin Fakultas Teknik Universitas Pasundan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23969/ksjme.v2i1.44257

Abstract

Kabupaten Pesisir Barat, Provinsi Lampung, merupakan salah satu sentra produksi kopi yang proses penyangraiannya masih dilakukan secara manual sehingga kurang efisien dan tidak seragam dalam mutu hasil. Penelitian ini bertujuan merancang dan menganalisis kinerja alat sangrai biji kopi berbasis gas burner dengan kapasitas 5 kg per siklus untuk meningkatkan efisiensi dan kualitas proses produksi. Metode perancangan menggunakan pendekatan sistematis Pahl dan Beitz yang meliputi tahap perencanaan konsep, perancangan detail, pembuatan, dan pengujian kinerja. Dimensi drum sangrai yang dirancang memiliki diameter 35,5 cm dan panjang 48 cm dengan volume efektif yang mampu menampung ±5 kg biji kopi berdasarkan rata-rata massa jenis 706,15 gram/liter. Hasil pengujian menunjukkan bahwa dalam waktu penyangraian 90 menit terjadi penurunan massa rata-rata dari 5.000 gram menjadi 4.583,2 gram atau sebesar 9,09% akibat reduksi kadar air selama proses termal. Sistem transmisi menggunakan motor listrik yang dikombinasikan dengan gearbox, pulley, dan rantai untuk menghasilkan putaran drum yang stabil. Hasil penelitian menunjukkan bahwa alat yang dirancang mampu meningkatkan konsistensi proses sangrai dan kapasitas produksi dibandingkan metode manual

Page 2 of 2 | Total Record : 18

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