cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
-
Contact Email
-
Phone
-
Journal Mail Official
-
Editorial Address
-
Location
Kota bandung,
Jawa barat
INDONESIA
Mesin
Published by Institut Teknologi Bandung
ISSN : -     EISSN : -     DOI : -
Core Subject : Engineering,
Mechanical Engineering
Arjuna Subject : -
Articles 539 Documents
 21   22   23   24   25 
ANALISIS DINAMIKA STRUKTUR PADA SISTEM FLEKSIBEL DI ANTARIKSA Djojodihardjo, Harijono; Parman, Setyamartana
Mesin Vol 8, No 1&2 (1989)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (6266.823 KB)

Abstract

Wahana antariksa atau satelit di antariksa merupakan suatu sistem yang fleksibel. Di sini dilakukan analisis ulang pada suatu system fleksibel di antariksa yang selain dipengaruhi olehmedan gravitasi bumi dan gaya orbital, juga dipengaruhi oleh gaya elastik. Sebagai kelanjutan dari analisis yang dilakukan oleh peneliti sebelumnya, dalam analisis ini adanya pengaruh rotasi struktur pada sumbu sendiri terhadap vektor percepatan dalam koordinat lokal yang bertitlk pusat di titik pusat massa benda tidak diabaikan.Selanjutnya dalam analisis ini ditinjau interaksi antara gerak satelit dengan getaran elastik yang dialaminya. Dengan meninjau stabilitasnya. Persamaan yang diperoleh kemudian dilinearkan dengan menganggap bahwa deformasi pada tiap titik generik jauh lebih kecil dari jari-jari. Persamaan inilah yang selanjutnya dianalisis. Ada dua persamaan yang dihasilkan, yaitu persamaan gerak rotasional struktur, dan persamaan modus generik dari dinamika struktur. Kemudian sistem dimodelkan sebagai suatu batang fleksibel yang merupakan penyederhanaan dari struktur satelit dengan panel surya yang secara geomotrik cukup dominan terhadap badan satelit. Pertama-tama ditinjau gerak dalam bidang orbital, dengan menganggap panel surya memiliki sifat struktural yang seragam sepanjang sumbu panjangnya. Selanjutnya ditinjau gerak tiga dimensi secara umum. Simulasi numerik dilakukan untuk mempelajari kondisi ketidakstabilan sebagai fungsi frekuensi modus structural dan kecepatan orbital. Hasil yang diperoleh dibandingkan dengan hasil serupa dalam pustaka.
CRACK DETECTION USING OPERATING DEFLECTION SHAPE Suharto, Djoko; Bagiasna, Komang; Abidin, Zainal
Mesin Vol 21, No 1 (2006)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (649.471 KB)

Abstract

This research presents development of vibration-based crack detection method using operating deflection shape (ODS) analysis from data measured by a Laser Doppler Vibrometer (LDV). Two types of work are conducted in this research. The first work is a numerical study, while the second work is an experimental study to verify the proposed method. In the numerical study, two types of specimen are used to simulate 2-Dimensional and 3-Dimensional problems using NASTRAN code. For the 2-Dimensional model, beams with two types of crack are tested, namely center and edge cracks. For the 3-Dimensional model, a plate specimen is tested. The length of the cracks and their locations are used as parameters to observe the ability of the proposed method to detect the existence and the location of the cracks. The results of numerical study show that the existence of cracks can be detected by using the natural frequency drops and the location of the cracks can be pinpointed by using the proposed S.Sd.D.Ms method (Square of the Second Derivative of the Deviation of the Mode Shape). In order to test the reliability of the proposed method, an experimental study is required. In this experimental study, FRF ODS measurements are conducted to derive the mode shape. Three types of specimen are measured, namely intact beam, center cracked beam, multiple center cracked beam and multiple edge cracked beam. The results of experimental study confirm that the proposed method can be used to detect the location of the cracks.
STUDI EKSPERIMENTAL ASPEK TERMOHIDROLIK BERKAS EMPAT PIPA SUSUNAN SEBARIS PADA FASILITAS NILO 1 Kamajaya, K; Suwono, Aryadi
Mesin Vol 11, No 1 (1996)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3193.194 KB)

Abstract

Lingkup studi eksperimental dalam makalah ini mencakup aspek termohidralik berkas empat pipa susunan sebaris pada fasilitas NILO I. Aspek termohidrolik dalam reaktor nuklir memegang peranan yang sangat penting ,karena berkaitan dengan keselamatan reakto. Pada penelitian ini dilakukan pengamatan secara eksperimen aspek termohidrolik sub-buluh denganmempergunakan tabung pipa uji yang terdiri dari empat pemanas. Sub-buluh pada penelitian ini dibagi ke dalam tiga bagian, sub-buluh tengah, sub-buluh pinggir, dun sub-buluh pojok. Setiap sub-buluh dibagi ke dalam delapan uni! sel dalam arah aksial. Data hasil pengamatan eksperimental distribusi temperatur yang didapatkan dibandingkan dengan hasil analisis numerik sub-buluh. Distribusi koefisien perpindahan panas lokal pada setiap sub-buluh dihitung berdasarkan data percobaan, kemudian dicari korelasi antara bilangan Nusselt, ReynoIds dan Prandtl. Distribusi temperatur dari hasil percobaan lebih rendah dibandingkan dengan hasil simulasi numerik, sedangkan korelasi antara bilangan Nusselt, Reynolds dan Prandtl yang didapat dari hasil percobaan tidak sesuai dengan korelasi yang ditunjukkan oleh Dittus-Boelter.
PENGEMBANGAN PERSAMAAN KORELASI PENDIDHAN KOLAM UNTUK REFRIGERAN HIDROKARBON Pasek, Ari Darmawan; Adriansyah, Willy; Hery, Hery; Leo, Hengky
Mesin Vol 23, No 2 (2008)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (5486.343 KB)

Abstract

Hydrocarbons (HC) are considered as the alterative substitutes of CFC and HCFC refrigerants. Using it as new refrigerants needs a complete knowledge of its characteristics. One of them is the boiling heat transfer coefficient. Series of experiments were carried out to investigate this characteristics. Experiments had been carried out with R-12 (CFC) and R-22 (HCFC) and their substitutes, HC-12 and HC-22. Tested refrigerant was conditiond at a saturated state and an electric heater immersed in the refrigerant pool of liquid was used as the boiling surface. Boiling heat transfer coefficient is determined as the ratio between the heat flux and the excess temperature on the boiling surface. The experimental results were compared between R-12 and R-22 with their substitutes. The experimental results were compared with the correlation equations proposed by researchers. Based on the analysis results, modified correlation equations are proposed for the tested refrigerants.
PEMANFAATAN SISTEM CAD/CAM/CAE DALAM REVERSE DAN FORWARD ENGGINEERING UNTUK TURBIN FRANCIS Djodikusumo, Indra; Santoso, Lukman; Haris, Rahmat
Mesin Vol 22, No 2 (2007)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (833.45 KB)

Abstract

The oil price has been increasing since the last few years. Since then the utilization of hydro power plant has also been increasing. The hydro power plant is very well known as environtmental friendly power plant and therefore its utilization is demanded all around the world. Indonesia has planned to build up until 488 MW micro and mini hydro power plant until the year 2020. Half of this is micro-hydro power plant and the other half is mini-hydro power plant. The turbines for micro-hydro power plant have been produced locally, but the other half which are mini-hydro power plant are still imported from foreign countries. It is the intention of this applied research to develop the capability of local industry to design and manufacture the Francis turbine for mini-hydro power plant from 300 kW until 5 MW. The utilization of CAD/CAM/CAE System is very intensif during the development phases. Reverse and forward engineering has been applied for this purpose. The good result has been achieved. The continuous improvement shall be done in the future in order to have the better result.
ANALISIS TERMOHIDROLIK ALIRAN AIR PENDINGIN PADA BERKAS EMPAT PIPA PEMANAS SUSUNAN SEBARIS MENGGUNAKAN PAKET PROGRAM FLUENT V4.25 Nazar, Reinaldy; Suwono, Aryadi; Soelaiman, T.A Fauzi
Mesin Vol 12, No 2 (1997)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (532.669 KB)

Abstract

The FLUENT V4.25 program is the CFD (Computational Fluid Dynamics) simulation. It can be used for fluid flow and heat transfer analyses and others. Regarding the program, the test is needed to know the validity, to verify that the program will give good output. Based on the test using experimental data on four heated parallel rod bundles, the output FLUENT V4.25, it gave a good result, where the differences between calculation and experimental data are not significant. It is expected that the FLUENT V4.25 program may achieve success in thermohydraulic analysis on other similar systems.
ALTERNATIVE REFRIGERANTS AND THEIR THERMOPHYSICAL PROPERTIES RESEARCH Watanabe, Koichi; Widiatmo, Januarius V
Mesin Vol 14, No 2 (1999)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (686.407 KB)

Abstract

The alternative refrigerants to be covered by the present paper include HFC (hydrofluorocarbon) refrigerants and their mixtures. Natural refrigerants such as hydrocarbons and carbon dioxide, and some new candidates such as HFEs (hydrofluoroethers), which all are non-ozone depleting substances. The authors aim to present an overview of the current state of the art with respect to several promising alternative refrigerants typically accepted in the refrigeration and air-conditioning industries in Japan. An emphasis will be given to the thermophysical properties research update that has significantly contributed to accelerate an adoption of binary and/or ternary HFC blends in various engineering applications. An important international collaboration through the IEA-Annex 18 project will be stressed so as to explain how the thermophysicists worldwide did contribute to achieve a successful landmark on thermodynamic property modeling of HFC refrigerants and their mixtures. Some essential features of other alternatives, such as hydrocarbons, carbon dioxide, and HFEs will also be discussed based on the general technical observations.
PERANAN INTERAKSI PENDIDIKAN DAN PROFESI DAL AM MENINGKATKAN KEMAMPUAN TEKNOLOGI NASIONAL Subianto, B
Mesin Vol 1, No 1 (1982)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (338.41 KB) | DOI: 10.5614/MESIN.1982.1.1.2

Abstract

Makalah ini disusun berdasarkan akumulasi pengalaman kami sebagai alumni 1TB yang berke- cimpung dalam dunia usaha swasta setama lebih dari satu dasawarsa, serta hasil pembicaraan dengan rekan rekan sesama alumni.Pengalaman tersebut kami gabungkan pula dengan pengamatan kami terhadap perkembangan ekonomi dan industri di negara-negara maju dan perkembangan ekonomi dan industri di Indonesia serta pengamatan kami mengikuti sejumlah adik adik kami yang bant lulus dari berbagai perguruan tinggi di Indonesia yang mulai bekeija dilingkungan pemsahaan kami.Adalah suatu kehormatan bagi kami untuk menyampaikan makalalr ini sekedar sebagai umpan balik bagi pimpinan, staf pengajar dan mahasiswa mesin 1TB.Semoga tulisan ini merupakan titik tolak yang akan dikembangkan dengan diskusi diskusi dan kerja sama yang lebih erat yang kiranya perlu untuk membantu perkembangan pendidikan mesin ITB
KAJI EKSPERIMENTAL DAN NUMERIK TENTAN G FAKTOR KETANGGUHAN RETAK MODUS I DAN II PADA LAMINATE KARBON/EPOXY SERAT TERANYAM Puja, IGN Wiratmaja; Suratman, Rochim; Ramelan, Aditianto; Prasetia, Hariadi Tri
Mesin Vol 15, No 3 (2000)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (678.226 KB)

Abstract

This paper presents experimental and numerical analysis on the influence of crack orientations to the fracture toughness of mode I and mode II for woven type carbon/epoxy four ply laminate. The experimental procedure is carried out through off axis tensile test (ASTM D 3039-76) with nine variation of crack orientations i.e. 5°, 10°, 15°, 30°, 45° 65°, 75°, 80°, and 90°. Three rail shear test (ASTM D 4255-83) is utilized for zero degree crack orientation. The stress and strain contours around crack tips are obtained numerically using the finite element method. Numerical and experimental results of the mode I (KI) and mode II (KII) fracture thoughness are presented in graphical form as a function of crack directions. Adopting Wu’s(11) Criteria for unidirectional lamina and Hahn’s[6] Criteria for general anisotropic lamina, a new mixed mode fracture toughness criteria is developed for woven fiber matrix laminate.
ANALISIS TERMOHIDROLIKA TERAS REAKTOR SUSUNAN HEKSAGONAL S, Adolf Asih; Suwono, Aryadi; Hardianto, Toto
Mesin Vol 13, No 3 (1998)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (376.658 KB)

Abstract

In this experiment, the study focusses on reactor core thermohydraulic aspects especially the distributions of fuel surface temperature, fluid temperature and fluid axial velocity. Simulation data were obtained in the middle, at the edge and at the comer sub-channels. In this experiment, modeling of hexagonal configuration of reactor core and reflector was carried out. The power generations were assumed constant at 250 kwatt, 375 kwatt and 5 00kwatt for each filel element. This model was prepared and analyzed using Fluent Version 4.25 package program available at the Thermodynamic Laboratory of IURC-ES. The result shows that this reactor core model gives low fuel surface and fluid temperatures.

Page 23 of 54 | Total Record : 539

 21   22   23   24   25 

Filter by Year

1982 2025


Reset
Filter By Issues
All Issue Vol 30 No 2 (2025) Vol 30 No 1 (2024) Vol 29 No 2 (2023) Vol 29 No 1 (2023) Vol. 28 No. 1 (2019) Vol 27, No 2 (2018) Vol. 27 No. 2 (2018) Vol. 27 No. 1 (2018) Vol 27, No 1 (2018) Vol 26, No 2 (2017) Vol 26, No 2 (2017) Vol. 26 No. 2 (2017) Vol. 26 No. 1 (2017) Vol 26, No 1 (2017) Vol. 25 No. 2 (2016) Vol 25, No 2 (2016) Vol. 25 No. 1 (2016) Vol 25, No 1 (2016) Vol. 24 No. 2 (2009) Vol 24, No 2 (2009) Vol 24, No 1 (2009) Vol. 24 No. 1 (2009) Vol 23, No 2 (2008) Vol. 23 No. 2 (2008) Vol 23, No 1 (2008) Vol 23, No 1 (2008) Vol. 23 No. 1 (2008) Vol 22, No 2 (2007) Vol. 22 No. 2 (2007) Vol. 22 No. 1 (2007) Vol 22, No 1 (2007) Vol 21, No 2 (2006) Vol. 21 No. 2 (2006) Vol. 21 No. 1 (2006) Vol 21, No 1 (2006) Vol 21, No 1 (2006) Vol 20, No 2 (2005) Vol. 20 No. 2 (2005) Vol 20, No 1 (2005) Vol. 20 No. 1 (2005) Vol. 19 No. 2 (2004) Vol 19, No 2 (2004) Vol. 19 No. 1 (2004) Vol 19, No 1 (2004) Vol 18, No 2 (2003) Vol. 18 No. 2 (2003) Vol. 18 No. 1 (2003) Vol 18, No 1 (2003) Vol. 17 No. 3 (2002) Vol 17, No 3 (2002) Vol. 17 No. 2 (2002) Vol 17, No 2 (2002) Vol. 17 No. 1 (2002) Vol 17, No 1 (2002) Vol 16, No 3 (2001) Vol. 16 No. 3 (2001) Vol 16, No 2 (2001) Vol. 16 No. 2 (2001) Vol 16, No 1 (2001) Vol 16, No 1 (2001) Vol. 16 No. 1 (2001) Vol 15, No 3 (2000) Vol. 15 No. 3 (2000) Vol. 15 No. 2 (2000) Vol 15, No 2 (2000) Vol 15, No 1 (2000) Vol. 15 No. 1 (2000) Vol. 14 No. 3 (1999) Vol 14, No 3 (1999) Vol 14, No 2 (1999) Vol. 14 No. 2 (1999) Vol 14, No 1 (1999) Vol. 14 No. 1 (1999) Vol 13, No 3 (1998) Vol. 13 No. 3 (1998) Vol. 13 No. 2 (1998) Vol 13, No 2 (1998) Vol 13, No 1 (1998) Vol. 13 No. 1 (1998) Vol 12, No 3 (1997) Vol. 12 No. 3 (1997) Vol 12, No 2 (1997) Vol. 12 No. 2 (1997) Vol. 12 No. 1 (1997) Vol 12, No 1 (1997) Vol 12, No 1 (1997) Vol 11, No 3 (1996) Vol. 11 No. 3 (1996) Vol 11, No 2 (1996) Vol. 11 No. 2 (1996) Vol. 11 No. 1 (1996) Vol 11, No 1 (1996) Vol. 10 No. 1&2 (1994) Vol 10, No 1&2 (1994) Vol 9, No 1&2 (1990) Vol. 9 No. 1&2 (1990) Vol 8, No 1&2 (1989) Vol. 8 No. 1&2 (1989) Vol 7, No 1&2 (1988) Vol. 7 No. 1&2 (1988) Vol 6, No 1&2 (1987) Vol. 6 No. 1&2 (1987) Vol. 5 No. 1&2 (1986) Vol 5, No 1&2 (1986) Vol 4, No 3&4 (1985) Vol. 4 No. 3&4 (1985) Vol 4, No 1&2 (1985) Vol. 4 No. 1&2 (1985) Vol. 3 No. 2&3 (1984) Vol 3, No 2&3 (1984) Vol 3, No 4 (1984) Vol. 3 No. 4 (1984) Vol 3, No 1 (1984) Vol. 3 No. 1 (1984) Vol. 2 No. 2&3 (1983) Vol 2, No 2&3 (1983) Vol. 2 No. 4 (1983) Vol 2, No 4 (1983) Vol 2, No 1 (1983) Vol. 2 No. 1 (1983) Vol 1, No 1 (1982) Vol. 1 No. 1 (1982) More Issue