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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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ANALISIS EKSPERIMENTAL GETARAN BANTALAN BOLA DENGAN MENGGUNAKAN FRF ORDE TINGGI Sewoyo, Trihono; Bagiasna, Komang; Abidin, Zainal
Mesin Vol 15, No 1 (2000)
Publisher : Mesin

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Abstract

This work is based on method developed by Storer, Lee and Tomlinson [1,2,3]. Storer [1] determined parameter of nonlinear system by curve fitting of higher order FRF that was obtained by measuring stimulus and response of nonlinear system in the frequency domain. While Lee [2] determined spatial model parameter i.e. mass, stiffness and damping constant based on higher order FRF that was obtained from measurement of excitation force amplitude in time domain and complex response in frequency domain. In this paper the two methods will be compared by conducting experiment on the ball bearing which shows nonlinear behavior [4,5]. The result shows the two methods have a significant difference. While the amplitude of excitation force affect the higher order Transfer Function and also the dynamical parameter of the system.
PENGARUH ARAH SERAT DAN SUSUNAN LAPISAN TERHADAP FAKTOR KONSENTRASI TEGANGAN PADA KOMPOSIT LAMINATE CARBONIEPOXY AS4/3501-6 BERLUBAN G LIN GKARAN DAN ELLIPS Puja, IGN Wiratmaja; B, Satryo Soemantri; Riyanto, Budi
Mesin Vol 13, No 2 (1998)
Publisher : Mesin

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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.
PERANCANGAN MEKANISME MOTOR STIRLING BERKAPASITAS 1 kW Hardianto, Toto; Suharto, Djoko; Dirgantara, Tatacipta
Mesin Vol 16, No 2 (2001)
Publisher : Mesin

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Abstract

The Stirling engine is an external combustion engine for converting the thermal energy into mechanical energy. This engine uses a Stirling cycle, which theoretically could have high thermal efficiency, which is as high as a Carnot cycle operating at a similar condition.This paper deals with a design process of Stirling engine’s mechanism stressing on the kinematics and dynamics aspects. Thermodynamics and geometry parameters are the inputs required for designing the Stirling engine’s mechanism. Material aspect has not been included in the design. The main parameters analyzed are: engine’s rotational speed, working temperature, cylinder’s pressure, inertial forces and power output.The results of the design are useful to give an overall picture of the main dimensions of a Stirling engine. Detail calculations are still needed for more advanced design.
PERAN PENDIDIKAN DALAM PENGEMBANGAN PROFESSI TEKNIK MESIN Samoedro, M
Mesin Vol 2, No 2&3 (1983)
Publisher : Mesin

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Abstract

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ANALISIS KEGAGALAN DRUM REM PRODUKSI UKM UNTUK TRUK/BUS DENGAN DAYA MESIN 190 HP Puja, IGN Wiratmaja; Suratman, Rochim; Suprihanto, Agus; Reza, Reza; Ako, Henry
Mesin Vol 17, No 2 (2002)
Publisher : Mesin

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Abstract

Indonesian small and medium industries (UKM) have the ability to produce relatively cheap truck/bus brake drums, but the quality is needed to be improved. The drums usually fail in form of cracks or fractures before the design life is reached. This paper presents failure identification of the UKM’s brake drums that is including material aspects, operational loading, and stress analysis. The mechanical and physical properties of the materials are studied by conducting tensile test, hardness test, chemical composition, and metallography. Fractography is also conducted to study the type and process of the failures. The brake loads are analyzed for various operational conditions such as straight, curved, and downhill path, with various value of decceleration. Stress analysis of the drum due to the applied loads is conducted using finite element method. The complete analysis shows that the UKM’s drums are not strong enough for the applied braking load. It is also observed that the crack locations are in agreement with the highly computed stressed areas.
SUMBER DAYA NUKLIR PADA WAHANA ANTARIKSA Djojodihardjo, Harijono
Mesin Vol 3, No 4 (1984)
Publisher : Mesin

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Abstract

Masalah penggunaan sumber daya nuklir pada wahana antariksa akhir-akhir ini telah menarik perhatian banyak negara di dunia, terutama berkaitan dengan keprihatinan terhadap bahaya kejatuhan pecahan satelit yang bersifat radioaktif. Dalam usaha memahami lingkup bahaya yang mungkin timbul akibar penggunaan sumber daya nuklir pada wahana antariksa yang mungkin jatuh kebumi dengan membawa bagian yang radioaktif, akan dibahas beberapa aspek penggunaan sumber daya nuklir pada wahana antariksa.
PENERAPAN MODEL UP WIND, EKSPONENSIAL, DAN CENTRAL DIFFERENCE PADA METODA ANALISA SUB BULUH Tandian, Nathanael P; Suwono, Aryadi; Winarto, Winarto
Mesin Vol 18, No 2 (2003)
Publisher : Mesin

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Abstract

Sub-channel analysis is a method for analyzing thermal hydraulic aspects of nuclear reactors or heat exchangers. The analysis calculates distributions of fluid temperature, pressure, axial velocity, transverse velocity, and fuel rod temperature or heat flux. This paper deals with efforts for improving the accuracy of the sub-channel method. Three numerical schemes for evaluating transversal advective heat rates, i.e.: up wind, exponential, and central difference schemes, were compared. The differences among calculation results obtained by programs that apply these schemes were insignificant. The paper also seeks the best definition of averaged temperature for evaluating physical properties of control volume. It was found that accuracy of the sub-channel method can be improved if the volume-averaged and area-averaged enthalpy in the energy equation, and the volume-averaged density in the axial momentum equation were evaluated based on the fluid temperatures at the middle of control volumes.
DASAR METODE DOMAIN WAKTU UNTUK ANALISIS GETARAN ACAK LINEAR Sutjiatmo, B
Mesin Vol 6, No 1&2 (1987)
Publisher : Mesin

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Abstract

Sistem getaran acak linear telah banyak dipelajari dengan menggunakan metode spektrum frekuensi. Tetapi, metode tersebut memerlukaan waktu hitung yang panjang, terutama untuk sistem orde tinggi, karena analisis dilakukan melalui transformasi Fourier dan penghitungan integral tak hingga. Dalam makalah ini akan disajikan metode lain , yaitu metode domain waktu yang dapat dipakai untuk menghitung sifat statistik jawab secara langsung dalam domain waktu tanpa harus melalui transformasi ke domain frekuensi. Metode ini lebih sederhana dan memerlukan waktu hitung yang lebih pendek dibandingkan dengan metode analisis spektrum.
ANALISIS SISTEM TATA UDARA DI DALAM KABIN KENDARAAN MINIBUS DENGAN MENGGUNAKAN PERANGKAT LUNAK COMPUTATIONAL FLUID DYNAMICS Soelaiman, T. A Fauzi; Aritonang, Andini
Mesin Vol 20, No 1 (2005)
Publisher : Mesin

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Abstract

The aim of this research is to establish an analysis of an air conditioning system in a minibus vehicle cabin through some series of numerical simulations using a Computational Fluid Dynamics software. Two three-dimensional models of the vehicle were used in the simulations. The first model is a minibus without any passenger, and the second model is a minibus with seven passengers. In this research, the passenger model was considered as another cooling load source, therefore an analysis of the cooling effect experienced by passenger was not performed. A calculation of cooling load was also done to determine the maximum cooling load, using the weather data of Jakarta city throughout the year 2002. An experiment was done using an actual vehicle to validate the model. The maximum error of temperature reading between experiment and simulation was calculated and gave an acceptable maximum error of 10%. The simulation in this step was performed using the first model and steady calculation. A series of simulations were also done to analyze the air conditioning system performance under maximum cooling load. These simulations were done by varying the mass flow rates of the air entering the cabin, using the second model and transient calculations. The temperature and velocity contours acquired from these simulations were able to give good understanding of correlations between the factors influencing the air condition in the cabin.
ANALISIS DINAMIKA STRUKTUR PADA SISTEM FLEKSIBEL DI ANTARIKSA Pasek, Ari Darmawan
Mesin Vol 9, No 1&2 (1990)
Publisher : Mesin

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Abstract

Berdasarkan data-data penelitian sebelumnya, dalam makalah ini akan dibahas model pendidihan dan mekanisme perpindahan panasnya pada permukaan berpori dalam cairan refrijeran. Ditunjang dengan suatu kajian analitik, diusulkan tiga model pendidihan yang terjadi pada tiga daerah fluks panas yang berbeda. Pada fluks panas rendah terjadi pendidihan pada dasar permukaan berpori dan pada fluks panas tinggi terjadi pendidihan pada permukaan. Sedangkan model pendidihan yang ketiga adalah pendidihan antara yang terjadi pada daerah transisi antara daerah fluks panas rendah dan tinggi. Pada makalah ini akan dibahas pula suatu metoda dan persamaan korelasi untuk memperkirakan koefisien perpindahan panas pada setiap daerah pendidihan.

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