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Mesin
Published by Institut Teknologi Bandung
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Mechanical Engineering
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Articles 539 Documents
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KOMPUTASI AERODINAMIK KENDARAAN BERMOTOR Djojodihardjo, Harijono
Mesin Vol 2, No 2&3 (1983)
Publisher : Mesin

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Abstract

Suatu metoda numerik untuk menghitung distribusi tekanan pada badan kendaraan bermotor yang dianggap mengalami gerak potensial diuraikan sebagai dasar penyusunan program komputer dan untuk dipergunakan dalam kaji parametrik perancangan aerodinamik kendaraan bermotor. Untuk meninjau keberlakukannya, metoda ini diterapkan untuk kasus dua dimensi sederhana. Demikian pula diuraikan hasil tiga dimensi yang telah diperoleh dalam literatur untuk metoda yang hampir serupa.
ANALISIS KEANDALAN DALAM PERANCANGAN TEKNIK, STUDI KASUS SISTEM KENDALI ELEVATOR PESAWAT CN235-220 Suweca, I Wayan; Sufyani, Rosyidin
Mesin Vol 17, No 3 (2002)
Publisher : Mesin

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Abstract

This paper presents a reliability analysis of elevator control system for CN235-220 aircraft. The analysis is carried out using Bayes theorem. Reliability analysis is performed for several system configurations, existing system and two modified systems. Reliability calculation shows that one of the modified systems has reliability relatively higher than the existing system. To insure all requirement needed, the other analysis i.e. strength, stability, etc. must be conducted for the modified system.
PENGARUH ETANA PADA REFRIGERAN HIDROKARBON Abidin, Zainal; Pasek, Ari Darmawan; Abdurrachim, Abdurrachim
Mesin Vol 18, No 2 (2003)
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Abstract

Hydrocarbon refrigerant is one kind of refrigerants, which is developed to substitute CFC and HCFC. The substances contained in hydrocarbon refrigerant are etane, propane, normal butane, and iso butane. Ethane is being suspected on reducing the performance of refrigerator. This paper deals with theoretical study of ethane influence in hydrocarbon refrigerant. First of all it is necessary to create software for evaluating thermodynamics properties. This software has many choices for prescribed thermodynamics properties. According to the analysis, it is known that the more ethane content in HCR-12, the more deviation of saturated pressure-temperature curves between HCR-12 and R-12. While in HCR-22 when the pressure is less that 4 bar, it is known that the more ethane content, the more deviation of saturated pressure-temperature curve between HCR-22 and R-22. However, if the pressure is above 4 bars, it is known that the more ethane, the saturated pressure-temperature curve is close to the one of HCR-22 with 4% ethane content. On performance test of standard refrigeration system using the refrigerant, it is known that the more ethane content in HCR-12 and HCR-22, COP of the system decreases gradually. The average temperature in evaporator and condensor also declines.
KOMPUTASI NUMERIK AERODINAMIKA KENDARAAN DENGAN METODA IDENTITAS GREEN Djojodihardjo, Harijono; Karnadi, Matheus
Mesin Vol 6, No 1&2 (1987)
Publisher : Mesin

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Abstract

Suatu program komputasi untuk perhitungan aerodinamika benda sebarang dalam aliran potensial telah disusun dan dikembangkan dengan dasar metoda panel elemen kwadrilateral dan dengan menggunakan prinsip identitas Green, dengan salah satu tujuan penggunaan perhitungan aerodinamika kendaraan bermotor. Program yang telah disusun diuji pada benda-benda dengan geometri sederhana guna menilai keandalan program serta tingkat ketelitian yang dapat dicapai. Selanjutnya dilakukan perhitungun aerodinamik pada benda dengan tahanan minimum dan kendaraan darat lain (secara dwi-matra). Dari hasil perhitungan ini terlihat bahwa program komputasi yang telah disusun mampu meramalkan sifat aerodinamika (potensial_kecepatan dan distribusi tekanan) benda-benda dengan hasil yang cukup baik.
ANALISIS PERCABANGAN RETAK PADA MATERIAL KERAMIK PIEZOELEKTRIK Puja, IGN Wiratmaja; Hidayat, Muhamad; Qin, Qing Hua
Mesin Vol 20, No 1 (2005)
Publisher : Mesin

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Abstract

Crack branch or kink in piezoelectric body may occur due to mechanical or electric loading. This paper presents the analysis of crack branch for ceramic piezoelectric materials. This type of advanced materials is very advantageous for application in smart structures, measurements device and actuators. Utilizing the extended Stroh Formalism for elastoelectric, the boundary value problems are solved by way of Hilbert Transforms. The explicit expressions for the elastic, electric, stress and electric intesity factor, and strain energi density are presented in integral forms. These integrals are solved using Gauss-Chebysev-Quadrature. Numerical results for piezoelectric ceramics are presented to illustrate both qualitative and quantitative behaviour of the stress- electric intesity factors.
PENERAPAN ANALISIS MODUS GETAR EKSPEFNMENTAL UNTUK IDENTIFIKASI PARAMETER MODUS GETAR STRUKTUR MEKANIK Bagiasna, Komang
Mesin Vol 9, No 1&2 (1990)
Publisher : Mesin

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Abstract

Dalam analisis modus getar eksperimental peranan aspek pengukuran Fungsi Respon Frekuensi adalah penting karena hasilnya digunakan sabagai acuan dalam menguji keabsahan model teoritik (misal: model elemen hingga) analisis dinamik suatu struktur mekanik. Keluaran yang diperoleh dari analisis di atas adalah berupa parameter modus getar yakni: frekuensi pribadi, perbandingan redaman dan bentuk modus getar dari struktur mekanik tersebut. Besaran tersebut diperoleh melalui proses curve fitting. Dalam pengkajian ini dilakukan analisis modus getar eksperimental atas suatu struktur mekanik dan pengernbangan proses curve-fitting data eksperimental dalam domain waktu.
KAJI EKSPERIMENTAL PENYERAPAN ENERGI TABUNG ALUMINIUM YANG MENGALAMI BEBAN TEKAN ARAH AKSIAL Hadi, Bambang K; Putra, Ichsan S; Tedy S, Yanyan
Mesin Vol 21, No 2 (2006)
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Abstract

Energy absorbing structural components are widely used in vehicles, such as car, aircraft, train, ships and others. The aim is to absorb energy during impact and thus lessen the risk of occupant’s injuries and limit the damage to the whole structure. Cylindrical shell that deform plastically due to longitudinal loading is one of the efficient energy absorbing structures. In this paper, experiments were carried out on aluminum cylindrical shell which was loaded axially. The diameters of the cylindrical shell were 60 mm and 100 mm, and the thickness was 2 mm. Some collapse trigger mechanisms were investigated, which are: plastic fold trigger, circular hole trigger and oval hole trigger. The experiments will then be compared with analytical results.
PENGEMBANGAN METODE PENYEIMBANGAN LANGSUNG TANPA MENGGUNAKAN MASSA COBA Iskandar, Ishak S; Abidin, Zainal; Bagiasna, Komang
Mesin Vol 11, No 2 (1996)
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Abstract

This paper deals with the development of direct balancing method that uses no trial mass. This activity is the continuation work of the previous research on semi automation of balancing machine that has been performed at the Dynamics Laboratory IUC-ES ITB. This method has been developed by using Frequency Response Function (FRF) data of a balancing machine as a function of frequency and rotors masses that will be balanced. These FRF data are used as aconversion factor of voltage, which is the output of velocity transducer, to unbalance flzrce. Using this method, the balancing process can be perfiarmed faster and more accurately than that of conventional balancing methods.
Sifat Tarik Dan Sifat Impak Komposit Polipropilena High Impact Berpenguat Serat Rami Acak Yang Dibuat Dengan Metode Injection Molding Mardiyati, Mardiyati; Srahputri, Nurdesri; Steven, Steven; Suratman, Rochim
Mesin Vol 26, No 1 (2017)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (635.411 KB) | DOI: 10.5614/MESIN.2017.26.1.2

Abstract

Rami merupakan salah satu jenis serat alam yang banyak tumbuh di Indonesia dan memiliki sifat mekanik yang baik. Hingga saat ini, pemanfaatan rami sebagai material penguat pada komposit polimer berpenguat serat alam telah banyak dipelajari. Namun, penggunaan serat rami sebagai bahan penguat dan polipropilena high impact (PPHI) yang banyak digunakan dalam industri otomotif sebagai matriks dalam komposit untuk aplikasi di bidang otomotif belum banyak dipelajari. Pada penelitian ini dipelajari pengaruh fraksi volume serat rami terhadap sifat tarik dan sifat impak komposit PPHI berpenguat serat rami. Komposit PPHI dibuat dengan menggunakan injection molding pada temperatur 190 0C dengan fraksi volume serat rami sebesar 5%, 10%, dan 15%. Pengujian densitas dan pengujian fraksi volume bahan penyusun diukur dengan mengacu pada ASTM D 792 dan ASTM D 3171. Kekuatan tarik komposit diukur dengan mengacu pada standar ASTM 3039. Harga Impak dari komposit diukur dengan mengacu pada ASTM D 6110-04. Dari penelitian ini dapat disimpulkan bahwa kekuatan tarik komposit tertinggi dimiliki oleh komposit PPHI berpenguat serat rami dengan fraksi volume serat sebesar 10%, yaitu sebesar 18.17 Mpa, lebih tinggi 21% dibandingkan dengan kekuatan tarik PPHI yang tidak diperkuat oleh serat rami. Harga impak komposit tertinggi juga dimiliki oleh komposit PPHI berpenguat serat rami dengan fraksi volume serat 10%, yaitu sebesar 46.39 KJ/m2, lebih tinggi 15.5% dibandingkan dengan PPHI yang tidak diperkuat oleh serat rami.
PENGHEMAT BAHAN BAKAR PADA KOMPOR GAS RUMAH TANGGA Abdurrachim, Abdurrachim; Wardani, D; Yudi, T
Mesin Vol 24, No 1 (2009)
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Abstract

A gas saver for gas cooking stove has been investigated, designed, and tested in this work. The device is a conical vertical cylinder placed around the cooking pan. The application of the device does not need any modification of the cooking stove nor the cooking pan. The temperature distribution of hot gas around the cooking pan is computed by means of numerical method. It is found that a significant fuel saving can be obtained using the gas saver because the vertical wall becomes an energy input area to the cooking pan which is not the case in absence of the gas saver. The tests of gas saver have been carried out using aluminum cooking pans of 16 cm and 29 cm diameters to heat 1.30 kg and 2.35 kg of water, respectively. In this preliminary test the gas saver is made of aluminum laminated cartoon. It is found that the gas saver reduces the cooking time and reduces the fuel consumption about 9 – 11 %. With the assumption of LPG consumption 12 kg/stove/ month,, 6,000,000 cooking stove used (government plan) and 10% of fuel saving, 86,400,000 kg of LPG will be saved per year. With the price of a gas saver Rp 20,000.00/piece/year, the total money saved will be amounted to Rp 240,000,000.00 per year.

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