School of Architectural, Civil and Mechanical Engineering SIGNAL ANALYSIS

thoughtgreenpepperMechanics

Oct 27, 2013 (3 years and 9 months ago)

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School of Architectural, Civil and Mechanical Engineering

SIGNAL ANALYSIS



EXPERIMENTAL PROJECTS

10 marks each


A total of three comprehensive experimental projects are to be undertaken by all students enrolled in the
subject as follows:

A.

Room
acoustics



evaluation of acoustic reverberation time weeks 1


4)

B.

Synchronous averaging (signal enhancement)


dealing with noisy signals (weeks 5
-
8)

C.

Spectral anal
ysis


evaluating the spectral characteristics of random processes

(weeks 9


12)



Each experimental
project is to be undertaken in groups of four or five mostly
in your own time
.
(bookings for equipment can be made using the calendar on the lab door (D328B)



Experimental reports are due
before

the start of the following project (4 weeks)



One report per
team will be submitted with the same mark allocated to each student in the team.


Safety and Occupational Health:

The University recognises the importance of safeguarding your health, safety and welfare and is committed to
eliminating conditions and incide
nts that could result in personal injury or ill health. Every effort has been made
to ensure that this activity is inherently safe and that it poses no danger to you or others. However, you are
ultimately responsible for your own actions and safety and y
ou should always act in a safe manner without risk
to yourself and others.


ROOM ACOUSTICS.




Aim:

To develop a software tool to determine the acoustic characteristics of various rooms by determining the
reverberation time of each room for each octave
band across the audible range (for humans).

The software
tool is to include a method for generating
band
-
limited or
broadband random noise as well as to measure the
acoustic response within the room and compute the reverberation time for each octave band.



Deliverables:

A working software tool demonstrating its operation with measured data
from rooms exhibiting different acoustic
characteristics

as well as a comprehensive technical report
that shall include

an introduction, background /
theory, design phi
losophy / approach, design description / explanation, typical results, discussion,
conclusions and an appendix containing a one page reflection statement from each team member addressing
the following:

o

Your views on the project and how it met the learning

outcomes for the unit

o

Evaluation of and comment on your own performance as a team member

o

Evaluation of and comment on each team member’s performance





SYNCHRONOUS AVERAGING





Aim:

To develop a software tool to determine the true

follower

vibration
on a

cam analysis machine
. The software
needs to reduce random noise within the signal using the synchronous averaging technique. The software tool
is to include a method for capturing the acceleration signal as well as to automatically perform the synch
ronous
averaging to de
-
noise the signal.


Deliverables:

A working software tool demonstrating its operation with measured data

consisting of the vibrations from
the
cam analysis machine

as well as a comprehensive technical report
that shall include

an intr
oduction,
background / theory, design philosophy / approach, design description / explanation, typical results,
discussion, conclusions and an appendix containing a one page reflection statement from each team member
addressing the following:

o

Your views o
n the project and how it met the learning outcomes for the unit

o

Evaluation of and comment on your own performance as a team member

o

Evaluation of and comment on each team member’s performance



SPECTRAL ANALYSIS








Aim:

To develop a software
tool to determine the
Power Spectral Density
(PSD)
and Probability Density

(PD)

functions of random processes
using
the Fast Fourier Transform (FFT)

and

an averaging process
. The
software tool is to include a method for capturing the signal
s

as well as t
o automatically determine the
average
PSD and PD functioins
.


Random processes to be studies may include: vehicle vibrations, engine vibrations,
seis
mic activity caused by r
road traffic, bridge vibrations, bagkground acoustic nois
e and are

only limited by
the availability of suitable transducers and recording devices.



Deliverables:

A working software tool demonstrating its operation with measured data
using at least two configurations

/
locations

as well as a comprehensive technical report
that shall inc
lude

an introduction, background / theory,
design philosophy / approach, design description / explanation, typical results, discussion, conclusions and
an appendix containing a one page reflection statement from each team member addressing the following:

o

Your views on the project and how it met the learning outcomes for the unit

o

Evaluation of and comment on your own performance as a team member

o

Evaluation of and comment on each team member’s performance