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All Journal Rekayasa Mesin Civil Engineering Journal Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) SMART SPORT SEMAR IJECS: Indonesian Journal of Empowerment and Community Services Mechanical Engineering for Society and Industry Jurnal Abdikarya : Jurnal Karya Pengabdian Dosen dan Mahasiswa
Budi Kristiawan
Department Of Mechanical Engineering, Faculty Of Engineering, Universitas Sebelas Maret, Surakarta
Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Public Health Social Sciences Transportation Other

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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
Tensile shear load in resistance spot welding of dissimilar metals: An optimization study using response surface methodology Sukarman Sukarman; Triyono Triyono; Budi Kristiawan; Amir Amir; Nazar Fazrin; Ade Suhara; Renata Lintang Azizah; Fajar Mucharom
Mechanical Engineering for Society and Industry Vol. 3 No. 2 (2023)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/mesi.9606

Abstract

Resistance spot welding (RSW) is being applied extensively in different industries, specifically the automotive sector. Therefore, this study was conducted to optimize the tensile strength load (TSL) in RSW by investigating the application of dissimilar materials as input parameters. The optimization process involved the combination of different galvanized and non-galvanized steel materials. The production of car bodies using galvanized steel with approximately 13.0 microns thick zinc (Zn) coating was found to be a standard practice, but this zinc layer usually presents challenges due to the poor weldability. This study prepared 27 units of TSL samples using a spot-welding machine and a pressure force system (PFS) for the electrode tip. The aim was to determine the optimal TSL through the exploration of specified RSW parameters. The process focused on using the response surface methodology (RSM) to achieve the desired outcome while the Box-Behnken design was applied to determine the input parameters. The optimal TSL obtained was 5265.15 N by setting the squeeze time to 21.0 cycles at a welding current of 24.5 kA, a welding time of 0.5 s, and a holding time of 15.0 cycles. The highest TSL value recorded was 5937.94 N at 21.0 cycles, 27.0 kA, 0.6 s, and 15.0 cycles respectively. These findings were considered significant to the enhancement of productivity across industries, specifically in the RSW process. However, further study was required to investigate additional response variables such as the changes in hardness and microstructure.
Performance Analysis of Nanofluid-based Photovoltaic Thermal Collector with Different Convection Cooling Flow Zainal Arifin; Nuha Khairunisa; Budi Kristiawan; Singgih Dwi Prasetyo; Watuhumalang Bhre Bangun
Civil Engineering Journal Vol 9, No 8 (2023): August
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2023-09-08-08

Abstract

Using solar energy through photovoltaic (PV) panels has excellent potential as an alternative energy source. However, the problem of high operating temperatures causing a reduction in work efficiency needs to be addressed. This study aimed to analyze the development of a cooling system to increase PV panels' electrical and thermal efficiency. The research involved analyzing the use of TiO2, Al2O3, and ZnO working fluids by adding 0.5 vol% to water in an active cooling method. The cooling system involved a rectangular spiral and a rectangular tube behind the PV panel. A solar simulator simulated solar radiation with intensity variations to analyze the cooling system's performance in different working conditions. The results showed that the heat exchanger with a nanofluid configuration reduced the panel temperature by 14 oC, which increased the electrical efficiency by up to 4.7% in the ZnO nanofluid. In the rectangular spiral configuration, the ZnO nanofluid reduced the panel temperature from 60 to 45 oC, increasing the Isc value from 2.16A to 2.9A and the Voc value from 21.5V to 23V. This resulted in a maximum power increase of the panel to 53W. Doi: 10.28991/CEJ-2023-09-08-08 Full Text: PDF
SIMULATION-BASED ASSESSMENT KINERJA TERMAL PADA CONCENTRIC TUBE HEAT EXCHANGER Kristiawan, Budi; Wijayanta, Agung Tri; Juwana, Wibawa Endra; Rachmanto, Rendy Adhi; Enoki, Koji; Prasojo, Arfi Singgih
Jurnal Rekayasa Mesin Vol. 14 No. 3 (2023)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v14i3.1372

Abstract

The double-pipe heat exchanger is one of the most popular heat exchanger devices. In this study, the concentric tube heat exchanger as the double pipe heat exchanger device was simulated with ANSYS code FLUENT. The simulation was done by based on the Reynolds number variation from 400010.000 using the method of co-current and counter flow. The hydrodynamic and thermal simulation results agree with the empirical correlation of the Pethukov and Dittus-Bolter equations, respectively. The friction factors of the water base fluid and nanofluid f TiO2/water f (0.1 vol.%) do not result in a significant difference in the turbulent flow regime for both co-current and counter flow. The thermal performance of TiO2/water (0.1% vol) nanofluid as indicated by the value of the heat transfer coefficient results in an increase of 6.9% for counter low flow and 6.0% for co-current flow. Meanwhile, the direction of fluid flow in the heat exchanger does not have a significant effect on its thermal performance.
STUDI EKSPERIMEN PENINGKATAN PERPINDAHAN KALOR FLUIDA NANO CuO /AIR PADA VERTICAL HELICAL MICROFIN TUBE Kristiawan, Budi; Khoirudin , Ilham; Wijayanta, Agung Tri; Hadi , Syamsul; Effendi, Hilbran Tama Dida
Jurnal Rekayasa Mesin Vol. 15 No. 3 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i3.1715

Abstract

The way to increase heat transfer is to use nanofluids and expand the heat transfer area. This research studied the thermal performance, convection heat change coefficient, and pressure drop in a double pipe heat exchanger experimentally in a vertically arranged helical microfin tube heat exchanger. Hot water flows on the side of the annulus. In contrast, nanofluid CuO/distilled water concentration of 0.05 vol% flows laminarly in the inner pipe of the microfin tube with cross-flow and parallel-flow arrangements. The result is convection heat transfer coefficient enhancement and thermal performance factor compared to the base fluid. Counter flow improves heat transfer better than parallel flow. This research contributes to the use of helical microfin and nanofluids to increase heat transfer in heat exchangers used in industrial processes.
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.
STUDI EKSPERIMEN PENINGKATAN PERPINDAHAN KALOR FLUIDA NANO CuO /AIR PADA VERTICAL HELICAL MICROFIN TUBE Kristiawan, Budi; Khoirudin , Ilham; Wijayanta, Agung Tri; Hadi , Syamsul; Effendi, Hilbran Tama Dida
Jurnal Rekayasa Mesin Vol. 15 No. 3 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i3.1715

Abstract

The way to increase heat transfer is to use nanofluids and expand the heat transfer area. This research studied the thermal performance, convection heat change coefficient, and pressure drop in a double pipe heat exchanger experimentally in a vertically arranged helical microfin tube heat exchanger. Hot water flows on the side of the annulus. In contrast, nanofluid CuO/distilled water concentration of 0.05 vol% flows laminarly in the inner pipe of the microfin tube with cross-flow and parallel-flow arrangements. The result is convection heat transfer coefficient enhancement and thermal performance factor compared to the base fluid. Counter flow improves heat transfer better than parallel flow. This research contributes to the use of helical microfin and nanofluids to increase heat transfer in heat exchangers used in industrial processes.
PENINGKATAN SARANA PENDUKUNG PENGOLAHAN MAKANAN PENDAMPING ASI SEBAGAI UPAYA PREVENTIF PENCEGAHAN STUNTING OLEH KOMINITAS SWEET BABY POKJA 4 TP PKK DESA KECAMATAN WEDI KABUPATEN KLATEN: Improving Supporting Facilities for Processing Complementary Foods for Breast Milk as a Preventive Effort to Prevent Stunting by the Sweet Baby Community, Working Group 4, TP PKK, Wedi District, Klaten Regency Budiana, Eko Prasetya; Hadi, Syamsul; Kristiawan, Budi; Septiyanto, Muhamad Dwi
Jurnal Abdikarya: Jurnal Karya Pengabdian Dosen Dan Mahasiswa Vol. 8 No. 02 (2025): Vol. 08 No. 02 Tahun 2025
Publisher : Lembaga Penelitian Dan Pengabdian Kepada Masyarakat Universitas 17 Agustus 1945 Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30996/.v8i02.11729

Abstract

Stunting merupakan masalah global yang berkembang dan terjadi diberbagai negara belahan dunia. Masalah kesehatan ini merupakan problem fundamental mendasar yang terjadi akibat adanya masalah kekurangan suplai gizi, protein dan lain sebagainya. Masalah tersebut menjadi perhatian khusus bagi Komunitas Sweet Babby Pokja 4 TP PKK Desa Pandes untuk menanggulangi masalah stunting. Kelompok ini memiliki kegiatan yang disebut dengan MP-ASI yaitu kegiatan menyediakan makanan pendukung ASI untuk bayi usia 0-2 tahun di wilayah Desa Pandes Kabupaten Klaten. Selain daripada menanggulangi isu kesehatan stunting komunitas Sweet Baby juga mennghidupkan kehidupan ekonomi dengan mendapatkan keuntungan dari penyediaan MP-ASI dan menerima pesanan makanan konsumsi untuk berbagai acara. Namun kendala yang dihadapi oleh Komunitas adalah penggunaan peralatan yang sederhana rumahan yang sangat terbatas untuk menerima pesanan dalam jumlah yang besar. Oleh sebab itu kegiatan pengabdian yang dilakukan oleh Universitas Sebelas Maret melalui Grub Riset Sustainable Thermofluids melakukan pengabdian ini sebagai bentuk daya dukung terhadap komunitas dan bentuk upaya pelaksanaan kegiatan Tri Dharma Peguruan Tinggi. Kegiatan berjalan dengan baik berupa penyerahan sarana prasarana serta pendampingan tenaga ahli berupa cooking class untuk pelatihan skill dan pengetahuan anggota komunitas tentang olahan makanan bergizi.
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.
Engineering And Application Of Vibration System Granulator Machine For Processing Organic Waste Into Compost In Gondangrawe Village Livestock Farmer Group Boyolali Budi Kristiawan; Doddy Setiawan; Musabbikhah Musabbikhah
IJECS: Indonesian Journal of Empowerment and Community Services Vol. 7 No. 1 (2026): IJECS: Indonesian Journal of Empowerment and Community Services
Publisher : Universitas Veteran Bangun Nusantara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32585/ijecs.v7i1.7544

Abstract

ABSTRACT Compost production by partners in Gondangrawe Village, Boyolali, is still conventional with a capacity of 100 kg/month, low quality, and inconsistent. The objective of this community service project is to design and implement a vibration system granulator machine to process organic waste, in order to improve production efficiency, quality, and the economic value of compost. The implementation method includes engineering design validated through Finite Element Analysis (FEA), manufacturing, as well as intensive training and assistance to KTTSR related to operations and packaging. The results of this community service project are the implementation of a granulator machine unit that has been proven to be safe (Safety Factor 15.00) and economically feasible. The application of this technology has successfully increased production capacity to 160 kg/month (8 hours of operation) and produced more uniform compost granules, thereby facilitating measurement and increasing sales value. Keywords: Granulator Machine, Organic Fertilizer, Organic Waste
Co-Authors Ade Suhara Agung Tri Wijayanta Agung Tri Wijayanta Amir Amir Budiana, Eko Prasetya Doddy Setiawan Dwi Aries Himawanto Dwi Aries Himawanto Dwi Aries Himawanto Dwi Aries Himawanto Effendi, Hilbran Tama Dida Eko Prasetya Budiana Eko Prasetya Budiana Enoki, Koji Erwin Erwin Fajar Mucharom Hadi , Syamsul Indri Yaningsih Indri Yaningsih Khoirudin , Ilham Musabbikhah Musabbikhah Nazar Fazrin Noval Fattah Alfaiz Nuha Khairunisa Prasojo, Arfi Singgih Rachmanto, Rendy Adhi Renata Lintang Azizah Rumi Iqbal Doewes, Rumi Iqbal Septiyanto, Muhamad Dwi Singgih Dwi Prasetyo Singgih Dwi Prasetyo Sukarman Sukarman Syamsul Hadi Syamsul Hadi Syamsul Hadi Triyono Triyono Ubaidillah Ubaidillah - Utomo, Dimas Wahyu Watuhumalang Bhre Bangun Wibawa Endra Juwana, Wibawa Endra Wijayanta, Agung Tri yefri chan Zainal Arifin Zainal Arifin