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All Journal Rotasi Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik Teknika: Jurnal Sains dan Teknologi Civil Engineering Journal Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Jurnal Teknik Mesin Indonesia Mekanika: Majalah Ilmiah Mekanika SMART SPORT SEMAR Jurnal Pengabdian kepada Masyarakat Nusantara Mechanical Engineering for Society and Industry
Indri Yaningsih
Department Of Mechanical Engineering, Faculty Of Engineering, Universitas Sebelas Maret, Surakarta
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Social Sciences Transportation Other

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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).
Pengaruh jenis proses pemotongan pada mesin milling terhadap getaran dan kekasaran permukaan dengan material aluminium 6061 Okky Nugra Retyawan; Indri Yaningsih; Heru Sukanto
Jurnal Teknik Mesin Indonesia Vol 12 No 1 (2017): Jurnal Teknik Mesin Indonesia
Publisher : Badan Kerja Sama Teknik Mesin Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (404.21 KB) | DOI: 10.36289/jtmi.v12i1.63

Abstract

This research was aims to determine the effect of the cutting process type on a milling machine to vibration and surface roughness of the aluminum 6061. The specimens were made using a cutting process type face milling, profile milling, pocket milling, slot milling and drilling. Surface roughness data retrieval is done on any type of cutting process using a surface roughness tester and vibration data was taken during a cutting process on any cutting process type using a vibration meter. The results showed the value of surface roughness and vibration in face milling of 0,5368 μm and 1,03 m/s², profile milling of 1,0984 μm and 1,49 m/s², pocket milling of 1,1004 μm and 1,73 m/s², slot milling of 1,4888 μm and 2,44 m/s² and drilling of 1,9944 μm and 18,62 m/s². Cutting process type on a milling machine having an influence on the vibrations and surface roughness. Each cutting process type has a different cutting force. The greater the cutting force that occurs in every cutting process type, the greater the value of the vibration and the surface roughness happened.
Studi implementasi cad/cam pada proses milling cnc terhadap kekasaran permukaan dan tingkat kepresisian aluminium 6061 Risdiyanto Edy Saputro; Indri Yaningsih; Heru Sukanto
Jurnal Teknik Mesin Indonesia Vol 11 No 1 (2016): Jurnal Teknik Mesin Indonesia
Publisher : Badan Kerja Sama Teknik Mesin Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (699.667 KB) | DOI: 10.36289/jtmi.v11i1.49

Abstract

This research was conducted to find out the influence of the implementationof CAD/CAM for CNC milling process to the surface roughness andprecision. Specimens were made by using seven types of cutting process.There are face milling, pocket milling, profile milling, slot milling, drilling,thread milling, and surface contouring. The results showed that theimplementation of CAD/CAM with a variation of the cutting processproduces roughness value which is lower than without the implementation ofCAD/CAM. The surface roughness values for each of the cutting processwere face milling process (0.5028 μm; 0.5132 μm), slot milling (0.664 μm;0.6556 μm), profile milling (1.282 μm; 1.3128 μm), pocket milling (1.3852μm; 1.4856 μm) and drilling process (1.9944 μm; 2.1136 μm). The averagevalue of the dimensions from the measurement showed the differencebetween the results of the implementation of CAD/CAM and without theimplementation of CAD/CAM. The percentage difference in the length andwidth were respectively 0.037%; 0.059% for profile milling; 0.039%;0.061% for pocket milling; and 0.151%; 0.317% for drilling. Statistical useof the implementation of CAD/CAM does not significantly affect the value ofthe surface roughness but it has a significant influence on the precision ofthe product with a 95% precision level.
PENGARUH VARIASI REDUKSI KETEBALAN COLD ROLLING SERTA SUHU ANNEALING TERHADAP SIFAT FISIK DAN MEKANIK ALUMINUM ALLOY 6082-T6 Rian Cahya Putra; Indri Yaningsih; Teguh Triyono
Jurnal Teknika Vol 13, No 2 (2017): Edisi November 2017
Publisher : Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/tjst.v13i2.7595

Abstract

The effects of the reduction of thickness and temperature annealing on the physical properties and mechanical properties of metal AA 6082 have been investigated in this study. Pressed force, and rolling time were constantly maintained. Annealing was carried out at 415 C for 150 minute to increase formability. Cold rolling was carried out at room temperature with varying thickness. The thickness was reduced from 3 mm to 2,5 mm, 2 mm, and 1,5 mm. the cold rolled samples ware annealed at various tempers in the range of 275oC, 325C, and 375C for 5 minute. Vickers hardness test were performed to evaluate the mechanical properties of alloy and the microstructure were performed to evaluate the physical properties of alloy. The result shows that hardness in 50% (1,5 mm) whithout annealed reduction produce the highest hardness 115,56 Hv.it has been observed that that as the degree of cold rolling increase the value of hardness couse cold rolling can introduce high density of dislocations. Annealing can refine the grain size, especially the grain length, resulting lower hardness.
STUDI EKSPERIMENTAL PENGARUH LAJU ALIRAN MASSA UDARA TERHADAP PRODUKTIVITAS AIR TAWAR UNIT DESALINASI BERBASIS POMPA KALOR DENGAN MENGGUNAKAN PROSES HUMIDIFIKASI DAN DEHUMIDIFIKASI Indri Yaningsih; Tri Istanto
Prosiding SNST Fakultas Teknik Vol 1, No 1 (2014): PROSIDING SEMINAR NASIONAL SAINS DAN TEKNOLOGI 5 2014
Publisher : Prosiding SNST Fakultas Teknik

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Desalinasi dengan proses humidifikasi dan dehumidifikasi dianggap sebagai cara yang efisien dan menjanjikan dimana memanfaatkan kondenser dan evaporator dari pompa kalor untuk menghasilkan air tawar dari air laut. Penelitian ini menguji pengaruh laju aliran massa udara terhadap produktivitas air tawar unit desalinasi berbasis pompa kalor dengan menggunakan proses humidifikasi dan dehumidifikasi. Pada penelitian ini laju aliran massa udara divariasi sebesar 0,0103 kg/s, 0,0153 kg/s, 0,0202 kg/s, 0,0254 kg/s dan 0,0306 kg/s dengan cara mengatur kecepatan udara sebesar 2 m/s, 3 m/s, 4 m/s, 5 m/s dan 6 m/s. Untuk setiap pengujian, laju aliran massa air laut  masuk humidifier dijaga konstan sebesar 0,0858 kg/s, temperatur air laut masuk humidifier dijaga konstan sebesar 45oC, salinitas  air laut umpan sebesar 31.342 ppm dan air laut dalam sistem ini disirkulasi ulang dan. Hasil penelitian menunjukkan bahwa produktivitas air tawar unit desalinasi meningkat dengan kenaikan laju aliran massa udara hingga ke sebuah nilai optimum dan menurun setelah nilai optimum tersebut. Produksi air tawar optimum diperoleh pada laju aliran massa udara 0,0202 kg/s yaitu sebesar 24,48 liter/hari. Produksi air tawar unit desalinasi ini pada laju aliran massa air laut 0,0858 kg/s untuk laju aliran massa udara 0,0103 kg/s, 0,0153 kg/s, 0,0202 kg/s, 0,0254 kg/s dan 0,0306 kg/s berturut-turut rata-rata sebesar 11,28 liter/hari, 18,72 liter/hari, 24,48 liter/hari, 23,04 liter/hari dan 21,60 liter/hari. Air tawar hasil unit desalinasi memiliki nilai salinitas 620 ppm. Kata kunci: dehumidifikasi, desalinasi, humidifikasi, pompa kalor
Outdoor Fitness Untuk Kalangan Penyandang Cacat/Disabilitas Di Kawasan Wisata Gunung Pegat, Desa Karangasem, Kabupaten Sukoharjo Budi Kristiawan; Syamsul Hadi; Dwi Aries Himawanto; Indri Yaningsih; Eko Prasetya Budiana; Agung Tri Wijayanta
SEMAR (Jurnal Ilmu Pengetahuan, Teknologi, dan Seni bagi Masyarakat) Vol 12, No 1 (2023): Mei
Publisher : LPPM UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/semar.v12i1.69781

Abstract

Pariwisata adalah salah satu faktor pendorong ekonomi di sebuah daerah. Perkembangan sektor pariwisata suatu daerah dapat memacu pembangunan sarana infrastruktur yang lain, seperti hotel, minimarket, jalan raya dan lain-lain. Dengan mengembangkan sektor pariwisata, maka akan terciptanya lapangan pekerjaan yang baru dan mengurangi pengangguran. Salah satu pariwisata yang sedang menjadi minat masyarakat adalah wisata jasmani. Selain menjadi sarana menghilangkan stres, wisata jasmani juga bisa menjadi sarana masyarakat untuk tetap menjaga kesehatan dan kebugaran tubuh. Salah satu wisata jasmani yang belakangan ini menjadi minat masyarakat adalah sarana alat fitness outdoor. Setiap sarana fasilitas umum termasuk sarana pariwisata haruslah ramah terhadap pengguna disabilitas. Pengabdian kepada masyarakat di kawasan wisata Gunung Pegat Desa Karangasem bertujuan meningkatkan dan menggairahkan roda perekonomian melalui obyek wisata dengan menempatkan sarana alat fitnes outdoor yang ramah dengan pengguna disabilitas.Kata Kunci: Outdoor fitness; disabilitas; pariwisata
Drying Characteristics of Pine Wood (Pinus merkusii Jungh. et de Vriese) Using Hot Air, Infrared, and Combined Infrared-Hot Air Yefri Chan; Dwi Aries Himawanto; Budi Kristiawan; Indri Yaningsih; Erwin Erwin
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol 14, No 3 (2025): June 2025
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtep-l.v14i3.772-780

Abstract

This research aims to determine the drying characteristics of Merkusii pine wood (Pinus merkusii Jungh. et de Vriese) using three methods, including the hot air drying, infrared, and combined infrared-hot air. The drying characteristics included temperature distribution, reduction in moisture content, drying rate, wood surface temperature distribution, and specific energy consumption (SEC). The results show that the combined infrared-hot air drying method produces a faster drying time and the highest drying rate compared to the only hot air or only infrared drying method. The fastest drying time was 345 min at a treatment temperature of 90°C, air velocity of 3 m/s, and the greatest drying rate was 0.429 gr/min at a temperature of 80°C, air velocity of 3 m/s. Additionally, the combined infrared hot air method produces a more uniform temperature distribution on the wood surface and lower specific energy consumption, specifically 1027.15 MJ/kg. Keywords: Drying, Hot air, Infrared, Temperature.
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
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.
The new modification of a solar still chamber with hollow glass: An experimental comparison between perpendicular and inline hollow glass configurations: Referred to by: https://doi.org/10.31603/mesi.17044 Eko Prasetya Budiana; Muhamad Dwi Septiyanto; Satria Auliansyah; Naufal Rizky Sayyid; Indri Yaningsih; Syamsul Hadi
Mechanical Engineering for Society and Industry Vol. 5 No. 2 (2025)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/mesi.13238

Abstract

Researchers around the world are conducting comprehensive studies on conventional single-slope solar stills (CS4). Recent trends have focused on minimizing heat loss and improving the productivity of these systems, particularly through modifications to the CS4 chamber. This present study examines the modified chambers of solar stills utilizing Perpendicular Hollow Glass Solar Still (PHGSS) and Inline Hollow Glass Solar Still (IHGSS). It provides a comprehensive analysis of the enhancements, highlighting key aspects such as productivity, energy balance, and efficiency, as well as introducing a potential new condensation site. To ensure accuracy and reliability, the results are validated using the coefficient he/hc from a previous study, which reported a margin of error of 7.76%. The application of hollow glass has proven its ability to produce distillate condensation due to the temperature gradient present between the inner surface of the hollow glass and the cavity it encloses. Moreover, the production and efficiency of both inline and perpendicular hollow glass highly exceeds those of conventional CS4.
Co-Authors A Muhammad Fuad Nur Rochim Aditya Rio Prabowo Agung Tri Wijayanta Akbar, Hammar Ilham Alfan Adha Hutama Putra Budi Kristiawan Budi Kristiawan Budi Kristiawan, Budi Budiana, Eko Prasetya Didik Djoko Susilo Dwi Aries Himawanto Dwi Aries Himawanto Dwi Aries Himawanto Eko Prasetya Budiana Eko Prasetyo Budiana Erwin Erwin Heru Sukanto Himma Firdaus Imanullah, Fahmi Iput Kasiyanto Istanto, Iwan Kusnandar, Nanang Muhamad Dwi Septiyanto Naufal Rizky Sayyid Okky Nugra Retyawan Pranata, Aria Pratama, Anandito Adam Qudsiyyatul Lailiyah Rian Cahya Putra Risdiyanto Edy Saputro Rumi Iqbal Doewes, Rumi Iqbal Satria Auliansyah Shazia Hanif Supono, Ihsan Syamsul Hadi Syamsul Hadi Syamsul Hadi Teguh Triyono Tri Istanto Tri Istanto Ubaidillah - Utomo, Dimas Wahyu Utomo, Fahri Setyo Wibawa Endra Juwana, Wibawa Endra Widhaya Bastian Purnama Wijaya, Rahman Wijayanta, Agung Tri yefri chan