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Mesin
Published by Institut Teknologi Bandung
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Core Subject : Engineering,
Mechanical Engineering
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Articles 539 Documents
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KORELASI KESETIMBANGAN FASA SISTEM CO2-C2H5OH PADA KONDISI SUBKRITIK J P Sitompul; I N Widiasa; Y Samyudia
Mesin Vol. 13 No. 2 (1998)
Publisher : Mesin

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Abstract

This paper concerns with the correlation of phase equilibrium of binary system of carbon dioxide-ethanol at subcritical and supercritical condition. In this study, three equations of state(Redlich-Kwong, Soave-Redlich-Kwong, and Peng-Robinson) together with conventional mixing rule, were applied for correlating phase equilibrium the system. The capabilities of these equations of state were examined with experiment results obtained from the literatures. The results show that Soave-Redlich-Kwong and Peng-Robinsoh equations of states can well correlate the phase equilibrium of binary system of carbon dioxide-ethanol.
PENGARUH ARAH SERAT DAN SUSUNAN LAPISAN TERHADAP FAKTOR KONSENTRASI TEGANGAN PADA KOMPOSIT LAMINATE CARBONIEPOXY AS4/3501-6 BERLUBAN G LIN GKARAN DAN ELLIPS IGN Wiratmaja Puja; Satryo Soemantri B; Budi Riyanto
Mesin Vol. 13 No. 2 (1998)
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Abstract

In recent years, fiber-matrix composite laminates have been widely used in mechanical structures. Due to functional design requirements, the laminates may contain holes that could cause stress concentration. Unlike isotropic plate, where the stress concentration depend upon geometric parameter and loading conditions, stress concentration factor of fiber-matrix composite is also depend on the anisotropic properties such as fiber direction and angle ply. This paper present intensive studies of the influence of the fiber direction and angle ply to the stress concentration factors for composite laminate containing circular and elliptical hole under uniaxial loading. The stress concentration factor curves are presented for various angle ply, fiber direction, and geometric parameter. These curves could be used by designer to obtain the optimum design of laminate structure containing hole.
PEMBUATAN DAN PENGUJIAN ANEMOMETER KAWAT PANAS TEMPERATUR KONSTAN UNTUK PENGUKURAN KECEPATAN UDARA PADA ALIRAN SWIRLING I N Diasta; Arianto Santoso; Priyono Sutikno; Uyung G. S Dinata
Mesin Vol. 13 No. 2 (1998)
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Abstract

To overcome the difficulties in calibrating a hot wire anemometer the equation E2 = A+BU0.45, as the reference equation in making hot wire anemometer, was changed to U = (1/ B (E2-A))2.22 to produce linear calibration curve. To realize this idea then an electronic circuit was designed with IC AD 534 and AD 538 as the main components. IThe hot-wire anemometer was made based upon the above principles then used to measure velocity components of swirling flow, which has two components of velocity, i.e.: axial (normal) velocity and tangential velocity. In measurement of swirling flow the probe-X was used to measure axial velocity and tangential velocity simultaneously. Magnitude and direction of swirling flow were determined from those velocity components.
ANALISIS DAERAH BINTIK MANIS PADA PERANCANGAN RAKET BULUTANGKIS Bagus Budiwantoro; I Wayan Suweca; Roby C. M Sibuea
Mesin Vol. 13 No. 2 (1998)
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Abstract

One method to increase badminton racket performance is by improving individual player's racket. For this purpose, two measurements are necessary, i.e. (1) the racket 's location of sweet spot that is inherent due to its manufacturing process and (2) the players "sweet spot", i.e. the spot that the player consistently hit the badminton cock, which for factory manufactured racket is not the racket 's inherent sweet spot. If the two spots do not coincide, than the original racket meet spot can be shi/ted until it coincides with the player sweet spot, making the racket performance to be maximised.
OPTIMASI STRUKTUR UNTUK MENDAPATKAN FREKUENSI ALAMI YANG TERPISAHKAN SECARA OPTIMAL Satryo Soemantri B; I Wayan Suweca; Endra Sujatmika
Mesin Vol. 13 No. 3 (1998)
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Abstract

In obtaining the dynamic response of a dynamic system, its uncouple modal equation of movement simplifies the usage of superposition modal method. This paper proposes a strategy to obtain the uncouple modal equation based an hypotheses of Basile : "Although the presence of modal-damping-couple, the modal equations of movement are dynamically uncoupled for a structure having small damping coefficient if its natural frequencies are well-separated"(1). This hypotheses is justified by several authors, i. e. by Hasselman(1). Thus, by separating the natural frequencyof a dynamic system using Hasselman criteria, it is expected that the modal equation of movement will become uncoupled. The separation of the natural fiequency is done by optimization method which is conducted by using the finite element software ANSYS.
ANALISIS SIKLUS KOMBINASI GAS DAN UAP Pawito M Sontowiro
Mesin Vol. 13 No. 3 (1998)
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Abstract

In general, the gas exits from gas turbine still has a high temperature. To recover its energy, a Rankine cycle is installed to receive thermal input energy from the gas. For each value of pressure ratio of the Brayton cycle, the optimum total efficiency is largely controlled by the pressure and temperature of steam entering turbine and the steam"”air mass flow rate ratio of the system. With the environment, the fluid entering temperature to the turbines, the minimum fluids temperatures difference in heat exchangers, and the quality of steam at the exit of steam turbine as constraints, optimum total efficiency of the system is investigated on this report.
PERANCANGAN ALAT PENCAMPUR PASIR CETAK “TURBO MIXER” Bagus Budiwantoro; Bayu Pratama Adikara
Mesin Vol. 13 No. 3 (1998)
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Abstract

Turbo Mixer with 350 kg capacity is designed to mix greensand by mixing it using turbo blade rotation so it creates a mix using scatter method. Using this method, the greensand will not be damaged during the process. The turbo blade rotation with lateral mixing arm was set in a way that the mixer could work efficiently. The construction of this turbo mixer is rigid but simple to ensure the easiness of operating, maintenance and manufacturing. In other application, Turbo Mixer could be developed for mixing of fertilizers, drugs etc. Several design practice figures for 350 kg turbo mixer, are taken from the recalculation of 750 kg turbo mixer that have been made before.
PENGENDALI LOGIKA FUZZY PADA MEKANISME GERAKAN LURUS PRESISI Ilham Budi Santoso; Zainal Abidin
Mesin Vol. 13 No. 3 (1998)
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Abstract

This paper discusses the implementation of a fuzzy logic controller on a precision straight-line motion mechanism. The precision straight-line motion mechanism, which is studied in this research, is a mechanism that was built to study methods of precision positioning. For this mechanism, a conventional PID (Proportional, Integral, and Derivative) controller will not beable to produce good performances because of non-linearity behavior of this mechanism. This paper shows that a fuzzy logic controller based on knowledge of a human (an operator) can solve this nonlinearity problem.
ANALISIS TERMOHIDROLIKA TERAS REAKTOR SUSUNAN HEKSAGONAL Adolf Asih S; Aryadi Suwono; Toto Hardianto
Mesin Vol. 13 No. 3 (1998)
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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 00'kwatt 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.
RETROFIT AND CONVERSION OF R-22 CHILLER TO R-290 AND ITS PERFORMANCE COMPARISON Aryadi Suwono; N. P Tandian; A. D Pasek; T Hardianto; T. A Fauzi Soelaiman
Mesin Vol. 14 No. 1 (1999)
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Abstract

The retrofit and conversion of a R22 chiller to R290 was done on an AC chiller Carrier Type 30-GB-070-910. The retrofit of chiller was mainly the implementation of safety features and conversion to HC refrigerant. A series of measurements to evaluate its performance has been carried out on the same chiller for both eases i.e. before and after conversion, while it was in use. The resulting data analysis revealed that the chiller performed better with HC refrigerant compare to its previous condition. Retrofitting procedure, refrigerant conversion, test procedure and data analyses are discussed in this paper.

Page 34 of 54 | Total Record : 539

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