Stress and strength analyses on the single pilot moveable seat for the ultra-light helicopter
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Date
2019-06
Authors
Mohamad Afiq Syarafuddin Bin Rosli
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Abstract
The purpose of this thesis is to analyze the stress and strength, to design and to fabricate
a moveable single pilot seat for an ultra-light helicopter (ULH). This thesis provides a
detailed method in analyzing the stress and strength the single pilot moveable seat of an
ultra-light helicopter and also the detail design of the moveable seat. The single moveable
seat is designed so that it is capable of being shifted longitudinally (forward and
backward) and able to rotated circumferentially around the centre post within a range of
angles. The single moveable seat must be able to support a load of the pilot and other
additional weight from a basic cockpit system which is implemented on this ultra-light
helicopter where the total estimated is about 100 kg. This project uses the concept of
Weight Shift Control (WSC) that is commonly used for a hang glider where the weight
of the pilot itself controls the attitude of ULH. The selection of material used to complete
this project is needed to ensure the strength of the selected material able to withstand to
load applied to this moveable seat. The simulation analysis is done by using one of the
computer-aided design (CAD) which is SOLIDWORKS 2016 X64 Edition software. The
investigation is performed to observe whether the structure of the moveable single pilot
seat can support the applied load or fail to deliver as required based on the several types
of simulation testing. Instead of performing the analysis using a SOLIDWORKS
software, the analytical approach are also calculated in this thesis to compare and verify
the moveable seat structure manually. The two-dimensional equation of motion formula
was used to calculate the stress of the structure. Both methods need to be performed to
compare the simulation result with the analytical method and also to calculate the
percentage difference between this two approaches. By comparing both of these
approaches, the percentage difference is 0.084%. To complete this project, most of the
material and equipment needs in fabricating this moveable seat model are available in
the Aerospace workshop.