balancing of rotating masses - wordpress.com...2014/04/03 · introduction rotating components are...
TRANSCRIPT
![Page 1: Balancing of Rotating Masses - WordPress.com...2014/04/03 · INTRODUCTION Rotating components are widely used in modern machine Example of rotating part/component/machine; a. Wheel](https://reader030.vdocuments.us/reader030/viewer/2022040201/5e581692b37b6a57f83ef63d/html5/thumbnails/1.jpg)
Mechanic of Machine
KJS 2233
Mohd Shukri bin Yob
Balancing of Rotating
Masses
![Page 2: Balancing of Rotating Masses - WordPress.com...2014/04/03 · INTRODUCTION Rotating components are widely used in modern machine Example of rotating part/component/machine; a. Wheel](https://reader030.vdocuments.us/reader030/viewer/2022040201/5e581692b37b6a57f83ef63d/html5/thumbnails/2.jpg)
INTRODUCTION
????????????......
![Page 3: Balancing of Rotating Masses - WordPress.com...2014/04/03 · INTRODUCTION Rotating components are widely used in modern machine Example of rotating part/component/machine; a. Wheel](https://reader030.vdocuments.us/reader030/viewer/2022040201/5e581692b37b6a57f83ef63d/html5/thumbnails/3.jpg)
INTRODUCTION
Rotating components are widely used in modern
machine
Example of rotating part/component/machine;
a. Wheel for vehicle
b. Fan
c. Quad copter
d. Engine
e. Turbine
![Page 4: Balancing of Rotating Masses - WordPress.com...2014/04/03 · INTRODUCTION Rotating components are widely used in modern machine Example of rotating part/component/machine; a. Wheel](https://reader030.vdocuments.us/reader030/viewer/2022040201/5e581692b37b6a57f83ef63d/html5/thumbnails/4.jpg)
![Page 5: Balancing of Rotating Masses - WordPress.com...2014/04/03 · INTRODUCTION Rotating components are widely used in modern machine Example of rotating part/component/machine; a. Wheel](https://reader030.vdocuments.us/reader030/viewer/2022040201/5e581692b37b6a57f83ef63d/html5/thumbnails/5.jpg)
ROTATING MASSES &BALANCING
For a machine rotating at high speed, balancing
is very important
Definition- resultant force acting for component
equal to zero
Types of rotating condition
I. Single plane
II. Multi plane
![Page 6: Balancing of Rotating Masses - WordPress.com...2014/04/03 · INTRODUCTION Rotating components are widely used in modern machine Example of rotating part/component/machine; a. Wheel](https://reader030.vdocuments.us/reader030/viewer/2022040201/5e581692b37b6a57f83ef63d/html5/thumbnails/6.jpg)
SINGLE PLANE Wheel for train
![Page 7: Balancing of Rotating Masses - WordPress.com...2014/04/03 · INTRODUCTION Rotating components are widely used in modern machine Example of rotating part/component/machine; a. Wheel](https://reader030.vdocuments.us/reader030/viewer/2022040201/5e581692b37b6a57f83ef63d/html5/thumbnails/7.jpg)
MULTI PLANE Crankshaft
![Page 8: Balancing of Rotating Masses - WordPress.com...2014/04/03 · INTRODUCTION Rotating components are widely used in modern machine Example of rotating part/component/machine; a. Wheel](https://reader030.vdocuments.us/reader030/viewer/2022040201/5e581692b37b6a57f83ef63d/html5/thumbnails/8.jpg)
EFFECTS OF NON BALANCED
PART
1. Part or component expose to higher load
2. Shaft expose higher load
3. Increase load to bearing
4. Vibration effect to component and system-
fatigue failure
![Page 9: Balancing of Rotating Masses - WordPress.com...2014/04/03 · INTRODUCTION Rotating components are widely used in modern machine Example of rotating part/component/machine; a. Wheel](https://reader030.vdocuments.us/reader030/viewer/2022040201/5e581692b37b6a57f83ef63d/html5/thumbnails/9.jpg)
THEORY OF ROTATING MASS
Rotating part/component- expose to centrifugal
force
Equation
Fc= m𝝎2r
m: mass (kg)
𝝎 : angular velocity (rad/s)
r : radius (m)
Balanced part- resultant force equal to zero
Unbalanced part- resultant force- not zero
![Page 10: Balancing of Rotating Masses - WordPress.com...2014/04/03 · INTRODUCTION Rotating components are widely used in modern machine Example of rotating part/component/machine; a. Wheel](https://reader030.vdocuments.us/reader030/viewer/2022040201/5e581692b37b6a57f83ef63d/html5/thumbnails/10.jpg)
SOLVING BALANCING PROBLEM
2 approaches
1. Analytical method
2. Graphical method
![Page 11: Balancing of Rotating Masses - WordPress.com...2014/04/03 · INTRODUCTION Rotating components are widely used in modern machine Example of rotating part/component/machine; a. Wheel](https://reader030.vdocuments.us/reader030/viewer/2022040201/5e581692b37b6a57f83ef63d/html5/thumbnails/11.jpg)
EXAMPLE 1 Four masses m1, m2, m3and m4 are 200 kg, 300 kg, 240 kg
and 260 kg respectively. The corresponding radii of rotation are
0.2 m, 0.15 m, 0.25 m and 0.3 m respectively and the angles
between successive masses are 45°, 75° and 135°.Find the
position and magnitude of the balance mass required, if its
radius of rotation is 0.2 m.
![Page 12: Balancing of Rotating Masses - WordPress.com...2014/04/03 · INTRODUCTION Rotating components are widely used in modern machine Example of rotating part/component/machine; a. Wheel](https://reader030.vdocuments.us/reader030/viewer/2022040201/5e581692b37b6a57f83ef63d/html5/thumbnails/12.jpg)
EXAMPLE 2 Four masses A, B, C and D are attached to a shaft and revolve in
the same plane. The masses are 12 kg, 10 kg, 18 kg and 15 kg
respectively and their radii of rotations are 40 mm, 50 mm, 60
mm and 30 mm. The angular position of the masses B, C and D
are 60°, 135° and 270° from the mass A. Find the magnitude
and position of the balancing mass at a radius of 100 mm.
![Page 13: Balancing of Rotating Masses - WordPress.com...2014/04/03 · INTRODUCTION Rotating components are widely used in modern machine Example of rotating part/component/machine; a. Wheel](https://reader030.vdocuments.us/reader030/viewer/2022040201/5e581692b37b6a57f83ef63d/html5/thumbnails/13.jpg)
EXAMPLE 3
Table below shows an unbalance rotating masses system, as an
engineer you are asked to propose the solution to correct this
unbalanced system.
Mass mass (kg) r (m) Angle(deg)
1 50 1.2 0
2 75 2 20
3 55 3 115
4 45 2.5 255