Articles
<![CDATA[Performance Analyse of Air Mixed and Displacement Ventilatilation System in Office Room Base on Computational Fluid Dynamic ]]>
<![CDATA[Bambang Iskandariawan]]>;
<![CDATA[Paulus Indiyono]]>;
<![CDATA[Herman Sasongko]]>;
<![CDATA[Prabowoa Prabowo]]>
<![CDATA[ IPTEK The Journal for Technology and Science Vol 20, No 2 (2009) ]]>
Publisher : <![CDATA[IPTEK, LPPM, Institut Teknologi Sepuluh Nopember ]]>
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DOI: 10.12962/j20882033.v20i2.127
<![CDATA[Air ventilation system is required for improvement as well as maintenance room air circumstance which is always clean in the whole day. Effective ventilation will enhance thermal comfort and indoor air quality therefore the productivity of occupant is expected also becomes mo-re intense. This research deals with the influence of supply air diffuser position concerning to thermal comfort and in-door air quality viewpoints. It is inspected four categories of air ventilation system: mixed and displacement ventila-tion used for air supply diffuser position in the centre and at the side of the room. Thermal comfort aspect is demons-trated through velocity and temperature of the room air without considering the value of relative humidity and room surface temperature average). On the other side the indoor air quality is focused on the intensity of the CO2 gas concentration which is appear inside the room gas. It applies Fluent 6.2 as computational fluid dynamics (CFD) simulation, some research variables are exploited. Office room model is generated in GAMBIT software create par-ticular office room design. Analyse result prove that the displacement centre ventilation system has more capability in the handling of room heat in addition to contaminant gas compare to the others.]]>
<![CDATA[Experimental and Numerical Study of Two Dimensional Flow of Bubble Separation over the Leading of Thickness Plate ]]>
<![CDATA[Herman Sasongko]]>;
<![CDATA[Abdul Haris Irfani]]>
<![CDATA[ JMES The International Journal of Mechanical Engineering and Sciences Vol 4, No 2 (2020) ]]>
Publisher : <![CDATA[LPPM, Institut Teknologi Sepuluh Nopember, Indonesia ]]>
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DOI: 10.12962/j25807471.v4i2.7870
<![CDATA[Various design modifications made by transportation equipment companies aim to increase the efficiency of fuel consumption. One of them is by reducing the drag force. This can be done by controlling passive turbulent boundary layers. The addition of rounded shape on the leading edge which is correlated with the length of the plane is one way of controlling the passive turbulent boundary layer which can accelerate the transition from the laminar boundary layer to the turbulent boundary layer. Therefore, this study aims to determine the effect of the Reynolds number and flow support length on the flow characteristics so that the downstream separation can be delayed. This research was conducted by experimental and numerical methods. The Reynolds number used is Ret = 5.08 × 104 and Ret = 8.46 × 104 . The test part of this research is the rounded leading edge of thick plate with a plane length of c/t = 6.5 and c/t = 10. The amount of rounded on the leading edge, the height of the test model and the length of the trailing edge are 10 mm, 100 mm, and 300 mm, respectively. The parameters varied in this study were the flow bearing field length (c/t) and the Reynolds number (Ret). Two-dimensional, steady numerical simulation was carried out using ANSYS Fluent software. The turbulence model used is k − kl − ω. The results obtained in this study are the longer the flow bearing plane and the greater the Reynolds number can delay the separation on the upper side of the circular front edge of the thick plate. The optimal length of the separation delay time is c/t = 10 with Ret = 8.46 × 104 .The separation bubble profile at c/t = 10 with Ret = 8.46 × 104 has length (x/c) = 0.129, thickness (y/t) = 0.1363, and angle (Θ) = 30.3 ◦ with the form factor (H) at point O 1.424. Overall the optimal variation is at c/t = 10 with Ret = 8.46 × 104 where the point of separation occurs when x/c = 0.945.]]>
<![CDATA[STUDI NUMERIK SEPARASI ALIRAN 3D AKIBAT PENAMBAHAN FFST PADA BIDANG TUMPU AIRFOIL ASIMETRI ]]>
<![CDATA[Ika Nurjannah]]>;
<![CDATA[Herman Sasongko]]>;
<![CDATA[Heru Mirmanto]]>
<![CDATA[ Otopro Vol 16 No 1 Nov 2020 ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin Universitas Negeri Surabaya ]]>
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DOI: 10.26740/otopro.v16n1.p12-17
<![CDATA[3D flow separation is a form of flow loss that cannot be avoided on turbo engines. In the axial compressor, 3D flow separation is due to the interaction between the blade boundary layer and the casing boundary layer or the hub boundary layer. The result of the secondary flow causes blockage of the flow which causes the pressure on the compressor to decrease. Efforts to reduce secondary flow are carried out by adding a FFST to endwall. This research was conducted in a numerical simulation using FLUENT 6.3.26 software. The parameters used in the free stream flow Re = 1.64 x 105 and Turbulence Intensity Tu = 0.3% to assess the comparison of the flow characteristics on the endwall of the British 9C7 / 22.5C50 asymmetric airfoil due to the addition of a FFST and without FFST with variations angle of attack (α) of 00, 80, 120, 140, 160 .The results show that the addition of FFST can increase the turbulent intensity in the area near the wall which turns into momentum, so that it has an impact on the ability of the flow to overcome the adverse pressure in the trailing edge area and further backward (delayed) separation which results in smaller wake. With the addition of the angel of attack, the saddle point position is more directed to the lower side and the attachment line is not induced by the horseshoe vortex, so that the flow is more able to follow the contours of the body, as a result the curling flow is weaker and the wake is narrower and the blockage (energy loss) can be reduced. The most effective energy reduction due to secondary flow through FFST occurs at α = 8 ° at 7.36%.]]>
<![CDATA[Numerical Study of Damper Plate and Nozzle Effect on Vortex Turbine Basin for Increasing Flow Kinetic Energy Entering Turbine Rotor ]]>
<![CDATA[Herman Sasongko]]>;
<![CDATA[Wildan Alfa Rahman]]>
<![CDATA[ JMES The International Journal of Mechanical Engineering and Sciences Vol 7, No 1 (2023) ]]>
Publisher : <![CDATA[LPPM, Institut Teknologi Sepuluh Nopember, Indonesia ]]>
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DOI: 10.12962/j25807471.v7i1.16270
<![CDATA[The Gravitational Water Vortex Power Plant (GWVPP) is a small-scale hydroelectric power generator that makes use of the energy generated from a vortex flow to turn turbine blades and generate electricity. In this research study, the focus was on the numerical analysis of the basin design of the GWVPP, which is divided into three sections: vortex generator section, transformer section, and turbine section. To support the transformation process from tangential vortex speed to axial vortex speed in the transformer section, a damper plate was installed to direct the rotating flow. The effect of the nozzle in accelerating the flow for optimizing the basin design was also studied to reduce blockage caused by the transformation process. The numerical results indicate that designs with nozzle have lower velocity outputs due to blockage from the rotating flow. At flow rate of 0.1 m3/s, the presence of damper plate reduces the maximum flow rotation, but at flow rate of 0.2 m3/s, it prevents flow leakage on the surface. The basin design without damper plate and nozzle is the optimal variation for flow rates of 0.1 m3/s, while the design with damper plate but without nozzle is optimal for flow rates of 0.2 m3/s.]]>
<![CDATA[Pelatihan Keterampilan Las Listrik untuk Masyarakat Sekitar Kampus ITS ]]>
<![CDATA[Suhardjono]]>;
<![CDATA[Triyogi Yuwono]]>;
<![CDATA[Herman Sasongko]]>;
<![CDATA[Djatmiko Ichsani]]>;
<![CDATA[Bambang Pramujati]]>;
<![CDATA[Bambang Sudarmanta]]>;
<![CDATA[Yusuf Kaelani]]>;
<![CDATA[Sampurno]]>;
<![CDATA[Mohammad Khoirul Effendi]]>
<![CDATA[ Sewagati Vol 5 No 1 (2021) ]]>
Publisher : <![CDATA[Pusat Publikasi ITS ]]>
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<![CDATA[Pengangguran di Indonesia secara umum masih cukup tinggi sekitar 7 juta orang sesuai data BPS pada Agustus 2018. Sebenarnya bukan hanya tugas pemerintah yang harus menurunkan jumlah pengangguran tersebut, tetapi juga peran Perguruan Tinggi dalam tugas Tridharmanya, yaitu Pengabdian kepada Masyarakat. Selain daripada itu pekerja konstruksi Indonesia yang jumlahnya 8,3 juta masih mempunyai kualitas rendah. Hanya sekitar 7,4% yang mempunyai sertifikat atau sekitar 616.000 orang dan hampir 2/3 yang bersertifikat tersebut masih dalam tingkatan “TERAMPIL” dan sisanya bersertifikat tingkat “AHLI”. Dari alasan itulah maka Laboratorium Proses Manufaktur dengan peralatan praktikum las listrik yang tersedia akan ikut berpartisipasi aktif dalam mengurangi angka pengangguran dan menciptakan keterampilan dalam bidang MEKANIKAL dengan subbidang Tukang Las. Pelatihan keterampilan las listrik ini bertujuan selain memberikan keterampilan bagi peserta baru yang ingin menjadi tukang las. Dampak yang diharapkan untuk Pelatihan keterampilan Las listrik ini adalah terciptanya tukang las baru yang siap bekerja baik di bengkel-bengkel las dan tukang las yang dapat mengisi lowongan kerja sebagai tukang las. Internet memasarkan menjadi Tukang Las lepas “Freelance” bermodal kecil yang dapat dipanggil ke Rumah. Untuk itu pada pelatihan ini diberikan suatu proyek sederhana untuk membuat produk seperti rak sepatu, gantungan handuk dan sejenisnya.]]>
<![CDATA[Urgensi Perawatan Sepeda Motor bagi Masyarakat Desa Pojok Kecamatan Campurdarat Kabupaten Tulungagung ]]>
<![CDATA[Triyogi Yuwono]]>;
<![CDATA[Herman Sasongko]]>;
<![CDATA[Sutardi]]>;
<![CDATA[Nur Ikhwan]]>;
<![CDATA[Suhardjono]]>;
<![CDATA[Nur Yuniarto]]>;
<![CDATA[Is Bunyamin]]>;
<![CDATA[Indra Sidharta]]>
<![CDATA[ Sewagati Vol 7 No 1 (2023) ]]>
Publisher : <![CDATA[Pusat Publikasi ITS ]]>
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DOI: 10.12962/j26139960.v7i1.455
<![CDATA[Sebagai desa berkembang, penduduk Desa Pojok, Kecamatan Campurdarat, Kabupaten Tulungagung umumnya telah menggunakan sepeda motor sebagai sarana transportasi dan terutama untuk akivitas pertanian mereka. Sebagai sarana transportasi untuk menopang kehidupan perekonomian mereka maka pemahaman akan perawatan sepeda motor secara berkala menjadi sebuah keharusan. Hal ini, di satu sisi, untuk menjaga umur ekonomi sepeda motor dan di sisi lain menjaga lingkungan udara yang bersih, bila sepeda motor terawat dengan baik tentu akan menghasilkan gas buang yang relatif lebih bersih. Oleh karena itu, dalam program pengabdian masyarakat ini akan dilakukan program servis sepeda motor gratis dan juga pelatihan perawatan sepeda motor bagi pemuda Karang Taruna Desa Pojok. Berkat antusiasme masyarakat membuat program ini berhasil melakukan servis gratis bagi 105 sepeda motor dari target 100 sepeda motor dan melatih 12 orang pemuda Karang Taruna Desa sebagai pionir perawatan sepeda motor di masa datang. Dengan kegiatan servis sepeda motor gratis dan selanjutnya perawatan berkala yang baik dipastikan sepeda motor akan berumur relatif lebih panjang dan aman digunakan dalam mendukung kehidupan perekonomian masyarakat setempat.]]>
<![CDATA[Studi Numerik Pengaruh Lebar Sudu dan Jumlah Sudu pada Performansi Closed Type Multiple Blade Impulse Wind Turbine ]]>
<![CDATA[Charminuel Sihombing]]>;
<![CDATA[Herman Sasongko]]>
<![CDATA[ Jurnal Teknik ITS Vol 12, No 1 (2023) ]]>
Publisher : <![CDATA[Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS ]]>
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DOI: 10.12962/j23373539.v12i1.101562
<![CDATA[Turbin angin yang hadir menjadi salah satu pilihan alternatif sumber energi khusunya energi listrik yang bersifat mikro maupun makro bagi wilayah Indonesia. Multiple blade closed type impulse wind turbine merupakan sebuah turbin inovasi dimana turbin ini merupakan suatu turbin angin jenis impuls tipe tertutup yang mempunyai banyak sudu-sudu. Dimana kerja dari Impulse turbine yaitu memanfaatkan drag force yang terjadi pada blade untuk menghasilkan torsi pada rotornya. Ketika aliran fluida melintasi blade Impulse turbine, tekanan statis aliran dianggap tetap. Pada turbin ini dipasangkan nozzle untuk meningkatkan kecepatan aliran fluida sehingga meningkatkan momentum aliran pada nozzle. Peningkatan momentum aliran pada nozzle ini akan menurunkan tekanan statis pada luaran nozzle. Fluida dengan momentum tinggi ini kemudian menerpa rotor blade sehingga menghasilkan drag force yang selanjutnya akan menghasilkan torsi pada rotor. Kinerja turbin impuls sangat dipengaruhi oleh kecepatan angin, lebar sudu, jumlah sudu, dan putaran rotor relatif terhadap kecepatan angin. Oleh karena itu, dilakukan penelitian untuk mengetahui pengaruh dari lebar sudu dan jumlah sudu terhadap performansi dari Multiple blade closed type impulse wind turbine ini. variasi yang digunakan dalam penelitian ini dimana digunakan lebar sudu 0.17m dan 0.19m dan juga variasi jumlah sudu yaitu 8 buah dan 12 buah. Penelitian ini dilakukan dengan menggunakan ANSYS FLUENT 2021 R2. Kondisi penelitian transient dengan menggunakan model turbulen K−???? standard turbulent. Kondisi dinding adalah no slip stationery wall. Hasil yang akan diperoleh dari penelitian ini adalah blade dengan lebar sudu 0.19m lebih efektif menghasilkan drag force jika dibandingkan dengan blade dengan lebar sudu 0.17m. Lalu pada variasi dengan jumlah blade 12 lebih efektif memanfaatkan aliran angin yang memasuki celah rotor sehingga lebih efektif menghasilkan gaya drag dibandingkan dengan variasi jumlah blade 8.]]>
<![CDATA[A CFD analysis of NACA 0015 airfoil as a horizontal stabilizer with gap length variations ]]>
<![CDATA[Gunawan Nugroho]]>;
<![CDATA[Herman Sasongko]]>;
<![CDATA[Mohammad Adenan]]>;
<![CDATA[Sarwono]]>;
<![CDATA[Heru Mirmanto]]>
<![CDATA[ Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 7 No. 2 (2022) ]]>
Publisher : <![CDATA[University of Muhammadiyah Malang ]]>
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DOI: 10.22219/jemmme.v7i2.26425
<![CDATA[The horizontal stabilizer is an important device which stabilize in the longitudinal direction is an important device for aviation. It also controls the pitching nose through the variation of elevator deflection angle. This work is to relate the lift coefficient with elevator deflection angle. The applied horizontal stabiliser is a plain flap with the gap length of 1.75%, 2% and 2.25% w.r.t. chord length. Results show that higher elevator deflection angle increases lift coefficient. For the 2 degree angle of attack and 20 degree of elevetor deflection angle, the lift coefficient is 0.93 (gap length 1.75%). Moreover, the lift coefficient is 1.83 for 10 degree horizontal stabiliser (gap length 2%).]]>
<![CDATA[Influence of Front and Rear Wings on Aerodynamic Forces in a Student Formula Car ]]>
<![CDATA[Noor, Dedy Zulhidayat]]>;
<![CDATA[Mirmanto, Heru]]>;
<![CDATA[Anzip, Arino]]>;
<![CDATA[Sasongko, Herman]]>
<![CDATA[ JMES The International Journal of Mechanical Engineering and Sciences Vol 8, No 2 (2024) ]]>
Publisher : <![CDATA[LPPM, Institut Teknologi Sepuluh Nopember, Indonesia ]]>
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DOI: 10.12962/j25807471.v8i2.21073
<![CDATA[Aerodynamic forces affect the stability of a car when moving, especially when turning. This study conducted a CFD analysis of the influence of wings on the student formula car when turning. The addition of front and rear wings to the formula car increases drag, downforce, and side forces. Except for an airplane that is landing, large drag forces are always avoided, as well as side forces that can interfere with vehicle stability. Interestingly, in contrast to drag and downforce, the coefficient of side forces tends to decrease as cornering speed increases. The increase in downforce or negative lift in this formula car is more dominant and significant than that in the others, and it is very beneficial in increasing wheel grip and traction on the car’s stability when turning]]>
<![CDATA[Perawatan Sepeda Motor Ojek Online Solusi Tulang Punggung Ekonomi Pengemudi Ojek ]]>
<![CDATA[Yuwono, Triyogi]]>;
<![CDATA[Sasongko, Herman]]>;
<![CDATA[Sutardi]]>;
<![CDATA[Ikhwan, Nur]]>;
<![CDATA[Widodo, Wawan Aries]]>;
<![CDATA[Suhardjono]]>;
<![CDATA[Sampurno]]>;
<![CDATA[Shabrina, Dhia Fairuz]]>
<![CDATA[ Sewagati Vol 8 No 5 (2024) ]]>
Publisher : <![CDATA[Pusat Publikasi ITS ]]>
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DOI: 10.12962/j26139960.v8i5.2196
<![CDATA[Terbatasnya transportasi publik yang nyaman serta juga kecenderungan masyarakat menggunakan kendaraan secara individu telah menciptakan peluang pekerjaan baru, yakni ojek. Bagi pengemudi ojek, sepeda motor untuk melayani pelanggan merupakan tulang punggung kehidupan ekonomi mereka. Sehingga perawatan sepeda motor menjadi kebutuhan utama. Namun dengan penghasilan yang hanya 100 ribu rupiah per hari, maka biaya perawatan menjadi persoalan tersendiri. Oleh karena itu, pengabdian masyarakat ini dilakukan dalam rangka membantu para pengemudi ojek dalam merawat sepeda motornya secara gratis. Bekerja sama dengan mahasiswa yang tergabung dalam Lembaga Bengkel Mahasiswa Mesin (LBMM), para dosen pengabdi dari Departemen Teknik Mesin, Fakultas Teknologi Industri dan Rekayasa Sistem, Institut Teknologi Sepuluh Nopember, telah berhasil melakukan servis gratis untuk 75 sepeda motor pengemudi ojek di sekitar kampus. Seluruh pengemudi ojek peserta kegiatan ini menyatakan sangat puas dan berharap kegiatan servis gratis ini dapat dilakukan secara rutin, karena sangat membantu mereka dalam melakukan pekerjaannya sehari-hari.]]>
