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All Journal Rotasi Civil Engineering Journal Jurnal Pengabdian kepada Masyarakat Nusantara
Indri Yaningsih
Jurusan Teknik Mesin, Fakultas Teknik, Universitas Sebelas Maret
Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Mechanical Engineering Social Sciences

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STUDI EKSPERIMENTAL PENINGKATAN PERPINDAHAN PANAS ALIRAN TURBULEN PADA PENUKAR KALOR PIPA KONSENTRIK DENGAN PERFORATED TWISTED TAPE INSERT WITH PARALLEL WINGS Yaningsih, Indri; Istanto, Tri; Juwana, Wibawa Endra
ROTASI Vol 17, No 3 (2015): VOLUME 17, NOMOR 3, JULI 2015
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (463.21 KB) | DOI: 10.14710/rotasi.17.3.120-129

Abstract

Heat transfer, flow friction and thermal performance factor characteristics in a concentric pipe heat exchanger fitted perforated twisted tape insert with parallel wings (PTPW), using water as working fluid are investigated experimentally. The design of PTPW involves the following concepts: (1) wings induce an extra turbulence near tube wall and thus efficiently disrupt a thermal boundary layer (2) holes existing along a core tube, diminish pressure loss within the tube. The experiments are conducted using the PTPW with the three wing depth ratio (w/W = 0.16, 0.24 and 0.32) and constant the hole diameter ratio (d/W) of 0.24 over a Reynolds number range of 5800–18,500. A typical twisted tape insert (TT) was also tested for a comparison. The results show that both mean Nusselt number and mean friction factor associated by all twisted tape are consistently higher than those without twisted tape (plain tube). It is also found that Nusselt number, friction factor and thermal performance factor increase with increasing wing depth ratio. Over the range considered, Nusselt number and friction factor in a concentric pipe heat exchanger with the PTPW are, respectively, 1.14–1.42 and 1.12–1.40 times of those in the tube with typical twisted tape (TT).
Glow-Wire Analysis of Polypropylene Blends for Mechanical and Marine Engineering Applications Firdaus, Himma; Supono, Ihsan; Pratama, Anandito Adam; Istanto, Iwan; Prabowo, Aditya Rio; Kusnandar, Nanang; Kasiyanto, Iput; Wijaya, Rahman; Lailiyah, Qudsiyyatul; Budiana, Eko Prasetya; Yaningsih, Indri; Akbar, Hammar Ilham; Imanullah, Fahmi
Civil Engineering Journal Vol. 11 No. 7 (2025): July
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2025-011-07-018

Abstract

Polymer materials are widely used due to their versatility; however, their vulnerability to fire is a significant concern, especially under electrical influences on engineered mechanical designs and marine structure applications. This study examines the fire resistance of a polypropylene (PP) blend using Glow-Wire Flammability Index (GWFI) and Glow-Wire Ignition Temperature (GWIT) tests. While previous research typically relies on flame-retardants to address flammability, this work proposes using a simple 1:1 weight ratio blend of two distinct PP types. This specific PP blend was selected to provide balanced material properties and improved processing consistency. The results from glow-wire tests were compared with previous findings to evaluate flammability performance. Our findings reveal that although the PP blend offers enhanced fire resistance compared to neat PP, it remains inferior to PP-containing flame-retardant additives. The outcomes suggest that this blended PP may be suitable for applications where mechanical properties, cost-effectiveness, and recyclability precede fire resistance, such as engineered automotive interiors, mechanical design of marine transportation, and low-risk electrical components in engineering infrastructure. This initial research contributes valuable insights into the fire behavior of PP blends. Moreover, it establishes a foundation for future investigations into polymer fire resistance, encouraging additional glow-wire testing on other polymer systems.
Peningkatan Prestasi Non-Akademik Siswa MAN 1 Surakarta melalui Pelatihan Kompetisi Robotika Unmanned Surface Vehicle Utomo, Fahri Setyo; Prabowo, Aditya Rio; Pranata, Aria; Istanto, Iwan; Wijaya, Rahman; Yaningsih, Indri; Susilo, Didik Djoko
Jurnal Pengabdian kepada Masyarakat Nusantara Vol. 6 No. 4 (2025): Edisi Oktober - Desember Fotcoming Issue
Publisher : Lembaga Dongan Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55338/jpkmn.v6i4.6623

Abstract

Robotika merupakan bidang ilmu yang menggabungkan teknik, komputer, dan elektronika untuk menghasilkan mesin cerdas yang mendukung efisiensi kerja manusia. Madrasah Aliyah Negeri (MAN) 1 Surakarta telah menerapkan pembelajaran robotika melalui kelas tutorial, namun keterbatasan penguasaan dasar desain 3D, perancangan PCB, dan pemrograman masih menjadi kendala dalam pengembangan inovasi serta persiapan kompetisi. Tujuan program Pengabdian kepada Masyarakat ini adalah meningkatkan kompetensi siswa dalam bidang Unmanned Surface Vehicle (USV) melalui pelatihan desain 3D, perancangan sirkuit PCB, serta pemrograman berbasis Python. Metode kegiatan dilakukan dalam lima pertemuan yang meliputi sosialisasi, pelatihan mekanik, perakitan PCB, dan object detection berbasis machine learning. Data dikumpulkan melalui observasi, pre-test dan post-test, serta evaluasi praktik. Hasil menunjukkan peningkatan signifikan pemahaman siswa pada bidang desain 3D (52% menjadi 84%), elektronika dan PCB (47% menjadi 79%), serta pemrograman (49% menjadi 81%). Simpulan dari kegiatan ini adalah pelatihan ini memperkuat keterampilan teknis siswa dan mempersiapkan mereka menghadapi kompetisi robotika di tingkat nasional maupun internasional, serta memberikan model pembelajaran berbasis praktik yang dapat diadaptasi pada pendidikan menengah untuk mendukung inovasi teknologi.
Co-Authors Aditya Rio Prabowo Akbar, Hammar Ilham Budiana, Eko Prasetya Didik Djoko Susilo Himma Firdaus Imanullah, Fahmi Iput Kasiyanto Istanto, Iwan Kusnandar, Nanang Pranata, Aria Pratama, Anandito Adam Qudsiyyatul Lailiyah Supono, Ihsan Tri Istanto Utomo, Fahri Setyo Wibawa Endra Juwana, Wibawa Endra Wijaya, Rahman