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Mesin
Published by Institut Teknologi Bandung
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Core Subject : Engineering,
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Articles 539 Documents
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ANALISA PENYEBAB KERETAKAN PADA PROSES PEMBUATAN DANDANG DARI PADUAN TEMBAGA Kuswaya, Dikdik; Suratman, Rochim
Mesin Vol 3, No 1 (1984)
Publisher : Mesin

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Abstract

Suatu paduan Cu yang digunakan sebagai bahan untuk pembuatan dandang, mengalami keretakan pada saat bahan tersebut ditempa. Untuk menanggulangi sebab-sebab keretakan yang terjadi kemudian dilakukan pemerikasaan struktur mikro, pengujian kekerasan, pengujian pengerolan dan analisa komposisi kimia terhadap bahan dandang tersebut. Sebagai bahan perbandingan dilakukan pula pemeriksaan yang serupa terhadap bahan baik. Dari hasil pemeriksaan yang dilakukan maka diperoleh kesimpulan bahwa penyebab keretakan pada bahan dandang adalah unsur Pb yang dapat menyebabkan terjadinya kerapuhan panas (hot shortness). Kerapuhan panas ini diakibatkan karena titik cair Pb lebih rendah daripada titik cair logam Cu, dan tidak larut dalam keadaan padat.
PENERAPAN TEKNIK "IDENTIFIKASI PARAMETER" PADA PENGUJIAN TERBANG DENGAN MANUVER STASIONER Jenie, Said D
Mesin Vol 4, No 1&2 (1985)
Publisher : Mesin

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Abstract

Suatu model matermatika untuk menerapkan teknik identifikasi parameter, PI, pada pengujian terbang stasioner dikembangkan, Teknik PI yang dipakai disini adalah metoda kesalahan output dengan disertai koreksi parameter melalui persamaan sensitivitas. Pengembangan dilakukan untuk modus keseimbangan longitudinal, namun demikian secara umum teknik ini dapat diterapkan pula pada modus lateral/direksional
PREDIKSI DAN ANALISIS KESTABILAN GERAK LONGITUDINAL KAPAL BERSAYAP WING-IN-SURFACE EFFECT Muhammad, Hari
Mesin Vol 19, No 1 (2004)
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Abstract

This paper discusses the stability of Wing-in-Surface-Effect (WiSE) craft. The aerodynamic parameters of new WiSE craft jointly designed by the Agency for the Assessment and Application of Technology, Indonesian Aerospace Ltd. and Institute of Technology Bandung are estimated using software Digital Datcom of the US Air Force. The aerodynamic parameters are used to predict the longitudinal stability characteristics of the WiSE craft. The surface effect on some aerodynamic parametes that influence the longitudinal stability of the WiSE craft will be discussed in this paper.
PENGARUH ROTASI PARTIKEL PADA MEKANISME KEAUSAN EROSI Soemantri, Satryo
Mesin Vol 7, No 1&2 (1988)
Publisher : Mesin

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Abstract

Keausan erosi terjadi akibat adanya tumbukan antara permukaan logam dengan partikel erosif yang keras dan bergerak dengan kecepatan tinggi. Akibatnya bagian permukaan tersebut akanberdeformasi plastis dan terkelupas. Penelitian telah dilakukan untuk mengetahui mekanisme keausan erosi dengan memperhatikan beberapa faktor yang mempengaruhi keausan erosi suatu permukaan logam. Salah satu faktor yang memegang peranan penting adalah sudut datang partikel (angle of impingement). Keausan erosi mencapai maksimum pada sudut datang sebesar kurang lebih 20o sedangkan pada 90° keausan mencapai harga minimum. Mekanismekeausan erosi dengan sudut datang 90° akan dianalisis dengan memperhatikan faktor rotasi partikel.
ANALISIS FREKUENSI PADA UJI TAK MERUSAK ULTRASONIK Trisnobudi, Amoranto
Mesin Vol 20, No 2 (2005)
Publisher : Mesin

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Abstract

In ultrasonic nondestructive testing an ultrasonic wave is usually radiated through a material by a transducer. If there is a flaw inside the material, reflected or diffracted waves caused by the interaction between the ultrasonic wave and the flaw, are received by the same or another transducer. The received signals must be processed in order to obtain information about the flaw characteristics. For the flaw which perpendicular to the beam wave, the flaw size can be determined by amplitude analysis, for example by using DGS (Distance Gain Scale) diagram. The oblique flaw can be characterized by time analysis such as Time of Flight Diffraction (TOFD) method. But if the flaw is small or there is a large enough noise, frequency analysis must be used. This paper deals with the two methods using frequency analysis, i.e. ultrasonic spectroscopy and split spectrum processing, to overcome the above problems.
PERANCANGAN BONDING ASSEMBLY JIG Martawirya, Yatna Yuwana; Wirjomartono, Sri Hardjoko; Riptanto, Totok Ary
Mesin Vol 10, No 1&2 (1994)
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Abstract

Sejalan dengan kemajuan teknologi di bidang industri pesawat terbang dan ruang angkasa. saat ini diperlukan material yang memiliki perbandingan kekuatan terhadap berat setinggi mungkin. Salah satu material yang sesuai dengan permintaan ini adalah komposit, yang banyak digunakan dalam struktur pesawat terbang. Komposit merupakan gabungan dari beberapa material yang disatukan pada temperatur dan tekanan tertentu. Proses terakhir ini dinamakan proses curing. dan biasanya dilakukan di dalam autoclaves.Salah satu produk komposit adalah komponen komposit yang terbuat dari Aluminium. Komponen yang dibuat ini harus memenuhi syarat-syarat yang diperlukan pesawat terbang, diantaranya geometri dan stabilitas bentuk yang memenuhi persyaratan. Untuk mendapatkan ini komponen komposit dibuat dengan menggunakan perkakas bantu yaitu bonding tool atau Bonding Assembly Jig (BAJ).Dalam makalah ini akan dibahas perancangan BAJ untuk pembuatan komponen pada sayap pesawat terbang, yailu aft flap assy outboard trailing edge flap wing. Penelitian yang dilakukan bertujuan menentukan performansi dan mengoptimalkan rancangan BAJ . Dari hasil perhitungan diketahui bahwa defleksi sewaktu proses handling sebesar 10,83 mm. lni berarti masih di bawah defleksi yang diijinkan, yaitu 14,96 mm. Allernatif rancangan BAJ 3 dipilih karena mempunyai performansi perpindahan panas yang paling baik.Kata kunci : sunbungan adhesives, perfonnansi kekakuan. performansi perpindahan panas.
COMPUTATIONAL AERODYNAMIC STUDY OF A HATCHBACK CAR MODEL Kurniawan, Rio Teguh; Zuhal, Lavi R; Amalia, Ema
Mesin Vol 23, No 1 (2008)
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Abstract

"Ahmed Body" is a well-established model of a hatchback car. In this study, computational simulations were conducted by using existing CFD software to capture "drag crisis" phenomena. Flow is assumed as incompressible flow with Reynolds Number of 4.3 x 10^6. A half of "Ahmed Body" was used in computational simulations with RANS method. Turbulence models that were employed mostly are k-e. The amount of grid cells used in computation is about 300.000. Computations were carried out mostly to get drag coefficients and also to examine vortex structure related to it. In "drag crisis" phenomena, maximum drag coefficient is reached at rear window angle of 30 degrees. Placement of spoilers and vortex generator has succesfully reduced the maximum drag coefficient at the critical angle of 30 degrees.
THERMODYNAMIC PROPERTY MODEL OF WIDE-FLUID PHASE n-BUTANE Sarin, Chan; Astina, I Made; Darmanto, Prihadi Setyo; Sato, Haruki
Mesin Vol 22, No 2 (2007)
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Abstract

New thermodynamic property model for n-Butane expressed in form of the Helmholtz free energy equation is presented. The formulation consists of eight terms of the so-called ideal-gas part and eighteen terms of the residual part. This is a relatively short equation in comparison to the existing equations, which are widely accepted, including the newly published in year 2006. In its development, available accurate experimental data of fluid properties and theoretical approach from the intermolecular potential were simultaneously considered to insure accuracy and to improve reliability of the equation of state over wide range of pressures and temperatures, especially at low temperatures in which the refrigeration field is concerned. From the coverage of experimental data used in model’s development, the validity range is then from triple-point (134.895 K) to temperature of 589 K and pressure up to 69 MPa. The uncertainties with respect to different properties are estimated to be 0.02% in ideal-gas isobaric specific heat, 0.2% in density, 1% in heat capacities, 0.2% in vapor-pressure except at very low temperatures, 0.05% in saturated-liquid density, 0.02% and 0.8% in speed of sound in the vapour and liquid phases, respectively.
PEMODELAN DINAMIK DAN VALIDASI MODEL DARI SISTEM KENDALI TANGKI GANDA Abidin, Zainal; Sutikno, Priyono; Maryanto, Is; Santoso, Ilham B
Mesin Vol 12, No 1 (1997)
Publisher : Mesin

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Abstract

This paper describes dynamic modeling and model validation of a couple-tank control system which consist of a couple-tank, two motor-and-pumps, two electric-motor drivers, and two water-level sensors. Initially, dynamic modeling of the couple-tank was derived analytically. This derivation produced several parameters whose values were unknown. Experiments were then performed in order to obtain the values of those parameters. In addition to the couple-tank, other components were also modeled statically. Once all components of the couple-tank controlled system have been modeled, model validation of the whole system can then be performed.
Design dan Analisis Statik Rangka Chassis Square Bar dengan FEM Abubakar, Mulyamin; Krisnowo, Agus; Suryaputra, Helmi; Noviantoro, Budi
Mesin Vol 26, No 2 (2017)
Publisher : Mesin

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Abstract

Telah dilakukan rancang bangun bending dies untuk pembuatan chassis kendaraan angkutan pedesaan. Chassis yang dihasilkan dengan metoda bending kinerjanya dibandingkan dengan chassis yang dibuat dengan metoda welding. Uji statis dilakukan dengan beban 2.5 kN dengan deformasi maksimum 1,37 mm. Untuk uji statis, chassis bending memiliki karateristik deformasi mendekati linier sebanding dengan beban gaya, sedangkan chassis welding karakterisitik deformasinya mengalami titik kritis pada beban 3.3 kN. Pada uji puntir, chassis bending dan welding memiliki karakteristik deformasi linier, namun kinerja dari chassis bending lebih baik dibanding dengan chassis welding. Dari hasil analisa komputasi menunjukkan bahwa desain chassis bending aman terhadap beban yang diberikan.

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