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Mesin
Published by Institut Teknologi Bandung
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Core Subject : Engineering,
Mechanical Engineering
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Articles 4 Documents
 1 
Search results for , issue " Vol 16, No 2 (2001)" : 4 Documents clear
STUDI PERBANDINGAN METODE MODAL TESTING KLASIK DAN MODAL TESTING KOMPLEKS DENGAN METODE ANALITIK DALAM IDENTIFIKASI ARAH WHIRLING ORBIT SISTEM ROTOR. Budiwantoro, Bagus; H, Zulhendri
Mesin Vol 16, No 2 (2001)
Publisher : Mesin

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Abstract

The classical modal testing theory has been widely and successfully used for modal parameter identification of structures of all kinds, except rotating machinery. In this paper a new modal testing theory is explained to separate the rotor vibration into positive and negative frequenc regions. The dynamic characteristics of nonrotating structures in negative frequency region have no meanings, but the dynamic characteristics of rotor systems in negative frequency region havesignificant physical meanings. Since all dynamic characteristics of rotor systems are closely related with rotor rotations, the directivity of modes is very important in rotor dynamics. The frequency response function are obtained by the new modal testing method using complex notation can be used to identify the directivity of modes such as forward and backward. Applications of the classical and complex modal testing method are compared with the analytical method to identify the whirl directions of single/multi rotor systems.
PENYUSUNAN PROGRAM BANTU BERBASIS MEH DAN METODE PSEUDO-MODAL UNTUK ANALISIS DINAMIK SISTEM POROS-ROTOR Suweca, I Wiratmaja; Santika, I Komang Jaya
Mesin Vol 16, No 2 (2001)
Publisher : Mesin

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Abstract

This paper presents a strategy in analyzing shaft-rotor dynamics system based on finite element and pseudo-modal methods by using MATLAB® programming language. The validation of computer program developed in this study is carried out by comparing the results with those obtained in the reference [1]. The computer program then is used to analyze the dynamic behavior of the electric generator 1FC 1801 produced by PT PINDAD (Persero). The validations of the computer program’s results with those obtained in reference [1] have shown a very good agreement. The application of the computer program in analyzing the dynamic behavior of electric generator type 1FC 1801 has shown that the rotor dynamic system has no critical speed in the range of its operational speed.
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.
RANCANGAN DASAR SISTEM KENDALI UMPAN MAJU PADA SISTEM KEMUDI EMPAT RODA BERDASARKAN MODEL KENDARAAN PENUH Sampurno, B; Tjokronegoro, H. A; I. M, Farida; Arismunandar, W
Mesin Vol 16, No 2 (2001)
Publisher : Mesin

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Abstract

This paper discribes a basic design of feed forward controller on a four wheel steering (4WS) vehicle. The controller directs all wheels to get an optimal maneuver. Controlling the wheels is done by controlling each sideslip angles (βi). The sideslip angles are computed by estimating slip angles (αi). Estimation of slips angles are done by sideslip angles based on full car model. The mathematical model is computed based on all forces that work on each wheels.

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