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Mesin
Published by Institut Teknologi Bandung
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Core Subject : Engineering,
Mechanical Engineering
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Articles 6 Documents
 1 
Search results for , issue " Vol 24, No 1 (2009)" : 6 Documents clear
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)
Publisher : Mesin

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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.
DESIGN AND TESTING OF COAXIAL ROTOR DUCTED FAN VTOL UAV Kartidjo, M; Nugroho, S. A; Jiniwangun, R. G
Mesin Vol 24, No 1 (2009)
Publisher : Mesin

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Abstract

In general aircraft are classified into two major categories: fixed wing and rotary wing aircraft which are commonly known as helicopters. The vertical take-off and landing (VTOL) aircraft is designed to be capable of both flying horizontally like a fixed wing airplane and also ascending and descending vertically and thus eliminates the need of a runway [1],[2],[3],[4]. At recently years, Ducted fan VTOL is most popular. The reason behind that fact is the efficiency of power on the maneuver. This paper presents the results of design and testing of coaxial rotor ducted fan VTOL UAV. Pitch and roll moment of this vehicle will controlled with 2 independence control surface that’s attached on the bottom of duct. The Ducted profile is applied to the system in order to improve the efficiency thrust at hovering state [3]. The goal of this design is to find optimized rotation speed rotor and distance between rotors. The value of rotation speed and distance between rotors could be simulated in Computational Fluid Dynamics (CFD) Analysis. The target of this simulation is to find some combination minimum yawing moment and maximum thrust at specifics distance between each rotor. In order to validate this simulation and analysis, we used dedicated platform that’s could sense thrust and roll, pitch, yaw moment.
KAJI EKSPERIMENTAL CIRI GETARAN PADA BANTALAN ROL DENGAN PEMBEBANAN STATIK Magiano, K; Bagiasna, Komang
Mesin Vol 24, No 1 (2009)
Publisher : Mesin

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Abstract

Any rolling bearing defect has a certain vibration response signature which can be observed through its waveform as well as frequency spectrum, such as the sideband frequencies, which indicate there is modulation phenomena among the vibration response signals. This research was carried out to study the vibration response signatures in the roll bearings due to the interaction between the static load and bearing inner/outer race waviness. This experimental research consists of FRF (Frequency Response Function) measurements to obtain the dynamic characteristics of the rolling bearing vibration, and power spectrum testing to measure the vibration response that occurs in the bearing. The shaft speed and static loads (vertical, horizontal, combination) are varied during the experimental study. Experimental results reveal Roll Passage Frequency (RPF) and its sidebands caused by the static load, and it was also found that waviness in the order of 4 at  the inner race and in the order of 6 at the outer race of the bearing.
PENYELESAIAN PENDEKATAN PROBLEM KONTAK HERTZIAN PADA KASUS KONTAK ANTARA RODA DAN REL Parwata, I. M; Puja, I. W; Budiwantoro, B; Brodjonegoro, S. S
Mesin Vol 24, No 1 (2009)
Publisher : Mesin

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Abstract

In this paper, an approach of the formulation for Hertzian contact problem between wheel and rail is presented. This formulation used analytic and numerical approach, especially in solving elliptic integrals in order to obtain dimension relations of the contact, deformation, contact pressure and stress contours. The main curvature radius range of the smaller rail are from 300-260 mm. Modeling with finite element solution was also performed as an alternative approach solution to the contact pressure. Besides, it is with Finite Element Method (FEM) can show the contact stress distribution and the influence of contact at a certain depth. The result of this formulation and Finite Element approach are compared with the model equation by Fischer and Wiest [1] and the exact value calculated by Hertzs equation [2]. The results showed that the calculation of the contact dimensions and maximum contact pressure give more conform results. The difference results obtained by the method of Hertz are between 1.47-2.37% for the maximum contact pressure and 2.45-3.02% for the major axis the ellipse. The difference results using finite element method also gives conforming results of 0.09-3.5% for the maximum contact pressure.
THE APPLICATION OF CONSTRAINT PROPAGATION TECHNIQUE FOR CONCEPTUAL AIRCRAFT DESIGN Zain, R; Bil, C
Mesin Vol 24, No 1 (2009)
Publisher : Mesin

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Abstract

In conceptual aircraft design phase, the aircraft configuration and several design variables are frequently changed and starting points are depended on any most probable design conditions. Therefore, it is required a design tool having flexibility to response to different starting points. The implementation of the constraint propagation supported by an object-oriented programming could result in a computer application that considerably accommodates the need of flexibilities.  Moreover, the implementation of some graphical user-interfaces and filter are not only to make it become user-friendly but also it may perform good filters to validate all inputs from the user. Use case diagram and class diagram are utilized as tools for designing the computer application using Microsoft Visual C++ 6. For a case study, some relations of basic aircraft geometry are implemented by selecting the six constraints and fourteen design variables. The result of this work shows that the application of constraint propagation is right and proper to handle any frequent changes during the conceptual design phase.
PENGHEMAT BAHAN BAKAR PADA KOMPOR GAS RUMAH TANGGA Abdurrachim, Abdurrachim; Wardani, D; Yudi, T
Mesin Vol 24, No 1 (2009)
Publisher : Mesin

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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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