Lap Report
(Epicyclic Gear Velocity Ratios)
(Belt Friction)
(Determination of Moments of Inertia)
Name: Mahmood Mohamed Nasser Alhabsi
ID Number: XXXXXXXXXX
Submission Date: 2/6/2020
Executive Summary
This report will contain of three main experiment which are determine of moment of inertia,
elt friction, and epicyclic gear velocity ratios. The first experiment will be about finding the
coefficient friction of two types of pulley-belt configuration. The experiment has two parts ,
in part one it will use the coil friction rig to determine the coefficient by changing the angles
of lap, in part two it will use the vee-belt friction rig to determine the coefficient by keep the
angle of lap constant less than 90 degrees and changing the tension two. In addition, compare
the experiment values with the theoretical values.
The second experiment will be about find the velocity ratios for different types of gear
a
angements. There are four main components of gear system which are sun gear, planet
gear, ca
ier arm, and annulus (ring) gear. In addition, the experiment will be of three gearing
a
angement. First a
angement will be about simple gear train, in this part the ca
ier arm
will be fixed, sun and annulus gears will be the input and output shaft respectively and from
the input and output shaft the velocity ratio will obtain. For the second a
angement which is
annulus gear fixed, the annulus gear will be fixed, and ca
ier arm will rotate, so from that the
input and output shaft will be sun and ca
ier arm respectively. In last a
angement, the sun
gear will be fixed, and annulus gear will be released so, the input and output shaft will be
ca
ier arm and annulus respectively. After determining the velocity ratios for each
a
angement experimentally, it will use the tabular method to determine the velocity ratios
theoretically and compare between them.
The last experiment will be about determining the moment of inertia using two methods
which are compound pendulum method and trifilar suspension method. In compound
pendulum method, first part is to calculate the time taken for 50 oscillations about the end of
a and b respectively and find the average time, then find the location of centre of mass b
using the time has found and after find the value of b the moment of inertia will be determine.
The second method, first thing is calculating the average time taken for 40 oscillations of the
empty platform, then add the additional mass for the platform and calculate the average time
taken for 40 oscillations. After calculating the average time, the moment of inertia will be
obtained.
The formatting of report will be technical analysis which will give a
ief of result of each
experiment, and discussion sections which will provide an explanation of the result found in
technical analysis. And final part is short summary of each experiment.
Contents
1.0 Introduction .............................................................................................................. XXXXXXXXXX1
2.0 Belt Friction ................................................................................................................... XXXXXXXXXX2
2.1 Technical Analysis ..................................................................................................... XXXXXXXXXX2
2.1.A Part A ......................................................................................................................... XXXXXXXXXX2
2.1.B Part B .......................................................................................................................... XXXXXXXXXX5
2.2 Discussion .................................................................................................................. XXXXXXXXXX7
2.3 Conclusion ................................................................................................................. XXXXXXXXXX7
3.0 Epicyclic Gear Velocity Ratios ...................................................................................... XXXXXXXXXX8
3.1 Technical analysis ...................................................................................................... XXXXXXXXXX8
3.2 Discussion ................................................................................................................ XXXXXXXXXX10
3.3 Conclusion ..............................................................................