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Articles 519 Documents
KONTROL AKTIF KEKAKUAN DAN MASSA STRUKTUR DENGAN MENGGUNAKAN JARINGAN SARAF TIRUAN Sangriyadi Setio; Herlien D Setio; Wiranto Arismunandar
Mesin Vol. 18 No. 1 (2003)
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Abstract

This paper presents a theoretical and experimental study on active control structure excited by seismic loads using artificial neural network Artificial neural network is used to calculate the control force based on acceleration of the structure which is obtained by accelerometer measurement. The control mechanism is implemented on the structure using active stiflness and mass based on continuous vibration measurement. The reability of the active control system with artificial neural network has been tested experimentally using a reduced model of two=storey steel flame excited by base acceleration through a small shaking table. The experimental study shows that the artificial neural network control method gives satisfactory results for many types of base excitation such as random and El-Centro N-S earthquake accelerations. The neuro control algorithm is simple and reduces consideranbly computational time.
PEMODELAN DAN PERANCANGAN GAS COOLER UNTUK MESIN REFRIGERASI CO2 Adriansyah, Willy
Mesin Vol 18, No 2 (2003)
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Abstract

Gas cooler is one of the important components in CO2 refrigeration system and it must be designed properly. Conventional mathematical modeling used in designing heat exchanger have some drawbacks when the working fluid has large variation on its thermo physical properties. This paper discusses detail modeling and designing one of heat exchanger types which takes into account unique characteristic of CO2 as refrigerant. The mathematical model is then validated by experimental data. The comparison shows that the model predicts gas cooler performance within 2% maximum deviation. The principles of modeling can be applied to various types of heat exchanger.
PEMBUATAN SERBUK NIKEL DENGAN PENGENDAPAN KATODIK ELEKTROLISA GARAM NIKEL SULFAT B, Hendly; Nasution, P; S, Rochim
Mesin Vol 6, No 1&2 (1987)
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Abstract

Metalurgi serbuk adalah fenomena pembentukan part yang spesifik yang melibatkan teknik pembuatan serbuk, Kompaksi, sintering dan proses tambahan yang ditujukan untuk meningkatkan mutu produk part yang akan yang akan dibuat. Proses pembuatan serbuk Nikel dan pengendapan katodik elektrolisa (Electrodeposition) merupakan salah satu cara pembuatan serbuk Nikel yang relatif paling mudah dan menghasilkan serbuk yang cukup baik untuk teknik pembuatan part dari serbuk logam tersebut.
KAJI NUMERIK DAN EKSPERIMENTAL PERPINDAHAN PANAS PADA EVAPORATOR UNTUK MENDINGINKAN UDARA Darmanto, Prihadi Setyo; Arjanto, Deddy Dwi; Ismail, Muhammad
Mesin Vol 20, No 1 (2005)
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Abstract

This paper presents numerical and experimental study of heat transfer on fins-tube heat exchanger that functioned as an evaporator for coolingof humid air. In this case, change of phase occurred both on air and refrigerant. The proposed numerical analysis is based on the application of mass and energy balances implemented at small control volumes that were part of evaporator. The result of numerical evaluation was then compared to the experimental observation. A good agreement between experimental and numerical results was achieved and the proposed numerical method also could be used as a tool in designing fins tube heat exchanger with phase change in both fluids.
GAYA POTONG SPESIFIK UNTUK PROSES FREIS DENGAN PAHAT BERGIGI MIRING/HELIK (HELICAL END MILLS) Rochim, Taufiq
Mesin Vol 9, No 1&2 (1990)
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Abstract

Data pemesinan banyak dimanfaatkan untuk merencanakan proses pemesinan. Data tersebut pada umumnya diperoleh dengan melakukan percobaan berbagai proses pemesinan yang melibatkan banyak jenis material benda kerja dan pahat. Khusus untuk proses Freis data yang diperoleh umumnya berasal dari percobaan freis dengan pahat muka (face milling cutter). Denqan face milling, umumnya kedalaman potong (aksial) relatif kecil bila dibandingkan dengan diameter pahat atau kedalaman potong radial. Pada kondisi ini, meskipun pahat yang bersangkutan mempunyai sudut mixing (helik), pengaruh sudut miring tersebut bisa diabaikan. Lain halnya dengan pengefreisan denqan pahat end-mill yang mempunyai sudut miring yang cukup besar, maka kondisi penqefreisannya akan berbeda dengan menqefreis muka. Data pemesinan dalam hal ini tidak bisa dimanfaatkan, kecuali jika dilakukan modifikasi rumus gaya pemotongannya. Untuk itu perlu dilakukan percobaan pengefreisan dengan end mill dimana datanya diolah dengan menggunakan rumus baru yang dikembangkan di Lab Proses Pemesinan Mesin ITB. Hasil penelitian ini cukup memberikan harapan sehingga kelak data pengefreisan yang ada bisa dimanfaatkan baik untuk proses mengefreis muka maupun mengefreis dengan end-mill.
EVALUASI POLA FUNGSI RESPON FREKUENSI PADA RESPON GETARAN BANTALAN GELINDING Monhendri, R; Bagiasna, Komang
Mesin Vol 24, No 2 (2009)
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Abstract

Rolling bearing is a mechanical component which is commonly used in industrial machinery to suppress mechanical losses due to friction. Health condition of those machines are monitored by measuring its vibration responses as normally conducted in predictive maintenance (PdM) technology. There are two important steps in PdM, i.e. frequency spectrum analysis for diagnostic purpose and control trip value which is based on the root mean square (RMS) vibration level evaluation of the machine in operation. The vibration response measuring results show, the floor noise level contributs to the increase in RMS vibration level. Floor noise found in the frequency spectrum of the rolling bearings vibration resembles the pattern obtained from the frequency response function (FRF) measurements of the rolling bearing assembly unit. The objective of this study is to evaluate the FRF patterns detected in the vibration response of a new rolling bearing installed in the measuring set up. The vibration response and FRF measurements were performed and the frequency spectrum is measured for various shaft rotating speeds as well as static loads. Floor noise signal obtained from frequency spectrums measurement shows a pattern which resembles the FRF curve of the roller bearing measuring set up. The FRF pattern of the floor noise is caused by rolling friction phenomena which generates random vibration excitation signals on the tested rolling bearing and its supporting structure.
KARAKTERISTIK MODUL PENYERAP ENERGI IMPAK MEKANISME INTERNAL INVERSION DAN AXIAL SPLITTING Setiawan, Rachman; Amir, Muhammad Hisyam; Sugiharto, Bambang; Fajrianto, Sigit
Mesin Vol 21, No 2 (2006)
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Abstract

The application of crashworthiness technology to a vehicle has a main objective of protecting the passenger or cargo from the effects of impact/collision. One of the strategies is by using impact energy absorbing (IEA) modules. Two of the alternatives of IEA modules are metallic tubes with internal inversion and controlled axial splitting mechanism. This paper presents both numerical and experimental approaches to understand the characteristics of the two mechanisms, before using them in design phase. LS-Dyna was used as the numerical simulation software for drop test case. The result of simulation is presented as the relationships between geometrical parameters and the crashworthiness parameters, e.g. impact energy and response force. Some cases are compared with quasi-static and drop test results.
PEROLEHAN SILIKAT DARI ABU SEKAM PADI DALAM SPOUTED-BED: EFEK PERPINDAHAN MASSA Sitompul, Johnner P; Wanadri, Agus
Mesin Vol 11, No 2 (1996)
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Abstract

A 5 cm diameter spouted-bed reactor has been applied for solid-liquid reaction, paddy ash and NaOH producing Na-silicate. Hydrodinamics of spouted-bed reactor was studied by using paddy ash-water system. Correlation for minimum superfisial spouting (Ums) was determined and follows the equation. ( in cgs unit)The spouted bed (SB) operates under transition regime i.e. Reynold number particle range 7-25 or Re number fluid ranging from 19 to 254. The mass transfer is the controlling step for this system as for all solid-liquid reactions are very fast. So, a model of mass transfer has been derived and mass transfer correlation in SB follows equations Sh = 191,34 + 0,6325 Sc0.35 Re1.89 Above correlation shows high mass transfer at stagnant fluid compared to other mass transfer correlations which is due to reacting system involved.Kata kunci : sunbungan adhesives, perfonnansi kekakuan. performansi perpindahan panas.
ANALISIS LOMPAT VERTIKAL TIPE SQUAT DENGAN MODEL SISTEM BENDA JAMAK Susilo, D D; Mahyuddin, A. I; Nurprasetio, I. P
Mesin Vol 24, No 1 (2009)
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Abstract

Vertical jump is a good indicator for success in sports that need strength and speed of lower extremity such as basketball, volleyball, and soccer. The skeletal model of human body is treated as a two dimensional multibody system to analyze vertical jump. The squat jump of a particular subject could be simulated on the multi-body system model. The simulation results in the maximum jump height in close agreement with the height obtained via the flight time method analysis. Hence, the simple multibody model is deemed adequate for squat jump analysis. Furthermore, the results of this research could be used as a basis for further modeling and analysis improvement. Advanced model should take into account the effects of the muscles. Accurate measurement could be achieved by employing better sensors and data acquisition system. Future results of investigation in the area of dynamics of human movement could serve the sport world and medical rehabilitation program.
PENGUJIAN KARAKTERISTIK KINERJA SIKLON SEPARATOR HEMAT ENERGI Darmanto, Prihadi Setyo; Primanto, Katon
Mesin Vol 12, No 3 (1997)
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Abstract

The performance of cyclone separator is measured by its capability to separate solid particles from dust laden gas flow and its pressure drop. The last parameter shows the energy used for running it. The cyclone having highest separation efficiency and lowest pressure drop is needed in the industrial application. It is the aim of this research work to study a modified cyclone in order to find a better performance than the classical cyclone type. The modification is employed by inclining the roof of cyclone. With this modification, the pressure drop could be reduced of about 50% without significantly reducing of separation efficiency. This paper presents an investigation of performance of the modified cyclone. This experiment proposes some empirical correlation of separation efliciency and pressure drop at various values of dust load.

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