The second part of your portfolio component for the 7112MECH consists of a small project.
engineering
Description
Project
proforma
The second part of
your portfolio component for the 7112MECH consists of a small project.
You will be required
to answer the questions outlined in this proforma based on the geometry and
tasks given to you.
The deliverables for
the examination are:
- the completed
pro-forma.
- one *.cae (recommended)
or *.inp file containing the analysis task required to answer. You need to name
the file “yourfamily name”.
These files will be
used to check your answers. In their absence you may lose marks.
Insert your name
here:
Problem Formulation:
A small-scale experimental structure is built
in order to analyse the effect of structural modification of a helicopter tail.
The structure is made of constant cross-section aluminium beams and it needs to
be restrained at one end (Figure Q.1). The details about the restrain are given
in figure Q3.
Aluminium properties (suggested):
E = 68..70 GPa
= 2650..2800 kg/m3
Based on your study you need to find the exact
values!
A sketch of the structure is shown in figure
Q1. All the dimensions are given in mm.
Figure Q1.
Length of the edge AF is 600 mm, length of
the edge FB is 300 mm. The angle between AF and FB is 
.
The opposite edges are parallel. On edge AF (and the opposite edge), you can
create (if necessary) a partition at 120 mm distance from point A.
The cross sectional area (see Figure Q2) is
constant along the length of the structure. All the dimensions are given in mm.
Figure Q.2
The rotor tail and the gearbox are modelled
as a point mass of approximately 0.35 kg and is attached at the top of the
structure (point B in Figure Q1). The location of this point mass will be
further referred as “rotor”.
In order to simulate a cantilever connection,
the structure is restrained as shown in figure Q3. How you decide to simulate
the restraint is also your task.
|
Figure Q3.
The frequency response of the structure are
given for a force applied at Point F (as shown in Figure Q1), first in
Y-direction then in Z-direction. The response is measured at the same location
(collocated response).
The Frequency response function obtained for
the force applied in Y-direction and displacement response measured in Y-direction
is shown in figure Q.4
Figure Q.4
The Frequency response function obtained for
the force applied in Z-direction and displacement response measured in Z-direction
is shown in figure Q.5
