International Journal of Mechanical and Aeronautical Engineering (IJMAE)

Volume 1 (2017)

 

Preface

Contents

 

An Adaptive Smith Predictor Control Scheme for a Downstream Vacuum System 1-001

Authors: An-Chen Lee, Shih-Chung Chang and Tai-Ho Fu

Published online: September 25, 2017

 

Abstract: This paper presents an adaptive control scheme to control a vacuum pressure system which can be applied in vacuum manufacturing industry. From the theory of vacuum system and system identification, the nonlinear dynamics of system can be linearized as a first-order plus dead time model (FOPDT). Having wide variation of parameters with time delay in different operation region is the main challenge of vacuum control. The proposed adaptive Smith Predictor control strategy can effectively on-line estimate system model well and deal with time delay under wide variation of parameters simultaneously. The experimental results are provided to demonstrate the advantages and performance of the proposed systematic method.

(PDF)

 

The Design of Car Window Cntrol System on CAN Bus 1-002

Authors: CHEN Wenjun

Published online: September 25, 2017

 

Abstract: For conventional mechanical car window control system, it is not easy to operate due to the wiring complexity and serious problems of electromagnetic interference. In the article, a control system of car window has been designed for CAN bus. And the software system and hardware system were both demonstrated. The structure, hardware configuration and software function of the whole system were explained respectively. The system of avoiding clip hand was designed for pressure sensor. And the experiment shows: the control system is more simple, reliable and valuable

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Visual Inspection System for the Spur Gears 1-003

Authors: Shinn-Liang Chang,Yu-Zeng Lin,Wei-Chung Chen

Published online: September 25, 2017

 

Abstract: In industry, gears are mostly measured by the direct contact between the stylus and gears. However, the measuring device is expensive and difficult to be applied in the measurement of the small gears. The main objective of this paper is to develop a measurement system for the spur gears by the image processing technology. In present, most of the commercial image measurement systems could only measure the point, line, and fillet of a work-piece. If the systems are applied in the gear measurement, it can only measure the outside and root diameters. The profile deviation and pitch error cannot be obtained due to the gears complicated geometry. In this paper, a new method of comparison edge detection is applied to measure the spur gear. It can have a better quality of the boundary curve to improve the precision of measurement. Thus, the developed system can be applied in the measurement of the important parameters and determine the precision of gear tooth profile, etc. In order to validate the developed system, the direct contact measurement is also preceded. This developed system provides a reliable and powerful method to measure the spur gears and the results can also be applied to the other types of planar gears such as non-circular gears.

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Effect of Transverse Eccentric Ballistic Damage on Static Torsional Strength of Tail Drive Shaft of Helicopter 1-004

Authors:Qasim Zaheer, Aun Haider

Published online: September 25, 2017

 

Abstract: Military helicopters have high probability of acquiring ballistic damage during their operations. One such damage concerned with the drive train of tail rotors of helicopter is due to ballistic effects that may be introduced because of passage of bullets or other ballistic objects. The ballistic damage may jeopardize the structural integrity of the shaft. The focus of the work exhibited here is to analyze the effect of transversely varying ballistic impact location on the static torsional strength of tail rotor drive shaft. The holes generated as a consequence of ballistic impact turned out to be the areas of stress concentration which is rational. The maximum torsional shear stress was calculated for each case and comparison was drawn with yield strength and ultimate strength using failure theories assorting the drive shaft as safe or unsafe. Moreover, the effect of varying ballistic location on the magnitude of maximum torsional stress is also discussed.

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Analysis of Crack Growth in Rib Cut out at Fuselage of Aircraft 1-005

Authors: S.Somashekar, Santosh Kolli

Published online: September 25, 2017

 

Abstract: Transport aircraft is a most complex structure. The aircraft fuselage shell is composed of stressed skin, circumferential frames, and longitudinal stringers . The skin is connected to the stringers and frame by rivets. Fuselage has a number of riveted joints and is subjected to a major loading of differential internal pressurization. When in the fuselage pressure increases and decreases during each take-off and landing cycle of aircraft, the metal skin of fuselage expands and contracts resulting in metal fatigue. Due to presence of more number of rivet holes, the fuselage skin has a large number of high stress locations and these are locations of potential crack initiation. The wide bodied transport aircraft are designed to sustain large fatigue cracks. This paper focuses attention on damage tolerance design of a fuselage structure of transport aircraft. In this paper, the stress intensity factor, quantifying the intensity of the stress field around a crack tip for a longitudinal crack under the pressurization load is studied. The objective of this paper is to investigate crack initiation, crack growth, fast fracture and crack arrest features in the stiffened panel. The longitudinal crack is initiated from the rivet hole and stress intensity factor is calculated using modified virtual crack closure integral (MVCCI) method at each stage of crack propagation. In order to arrest crack propagation tear straps are used, which prevent the further crack propagation. In this paper the linear static stress analysis of stiffened panel of a fuselage is performed using MSC NASTRAN solver. The pre-processing of the model is done by using MSC PATRAN software.

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