# Dynamic Balancing Lab Report

Topics: Force, Balanced line, Mass Pages: 10 (1502 words) Published: October 23, 2014
Huanyu (Kaspar) Chen

ID:1213054

11/3/2014

ES2A7 Dynamic Balancing Lab Report
Name: Huanyu Chen
Student ID: 1213054

Contents
ES2A7 Dynamic Balancing Lab Report............................................................................................... 1 Abstract ..................................................................................................................................... 1 Introduction .............................................................................................................................. 1 Theory ....................................................................................................................................... 2 Experimental ............................................................................................................................. 3 Result......................................................................................................................................... 6 Discussion.................................................................................................................................. 8 Conclusion ................................................................................................................................. 8 Appendix ................................................................................................................................... 9

Abstract
The aim of this experiment was to calculate and found out that in what situations the four components of the rig satisfied static balance and dynamic balance. By applying forces balancing equation and vector diagram obtain that, when M 1 at bearing 90°, M2 at 0°, M3 at 197°and M4 at 261.5°static balance archived. For archiving dynamic balancing, M1, M2, M3 and M4 need to stay with the same bearing, but also need to have the length of 6.45cm, 15.45cm, 17.25cm and 3cm respectively from one end of the scale.

Introduction
An object that imparts a vibration to its bearings when it rotates is defined as "unbalanced". The bearing vibration is produced by the interaction of any unbalanced mass components which present with the radial acceleration due to rotation. As the mass components are rotating, the force is also rotating and trying to move the object along the bearings. Therefore, a vibrating force is produced, and acting on any point on the bearing.

However, in some situations, especially in the design and manufacture of high speed rotating equipment, ‘unbalance’ and ‘vibration’ are very important issues, sometimes may be dangerous. Unbalance in high speed rotating components may cause noise, excessive vibration, component wear, and reduce the bearing life. Hence balancing is a very essential process.

1

Huanyu (Kaspar) Chen

ID:1213054

11/3/2014

Dynamic balancing is a very common used method in engineering aspects, which is the process to rotate an object at a high rate of speed, and by adjusting the position of the object or subtracting or adding weight to remove all the cause of vibration, and run the unit smoothly. The aim of this experiment was to investigate how to produce both statically and dynamically balanced rotating systems.

Theory

Figure 1.1. From Dynamic balance lab briefing sheet, page1.
Static balance describes the process where primary forces caused by unbalanced mass components in a rotating object may be resolved into one plane and balanced by adding a mass in that plane only. As the object would now be completely balanced in the static condition which the main idea is that the total resultant forces are zero. Therefore,

Fn

 0

 F  ma  mr 2

4

Fn

n

 m 1 r 1  m 2 r 2  m 3 r 3  m 4 r 4  2  0

1

 m1r 1  m 2 r 2  m 3 r 3  m 4 r 4  0
So for static balance the vector diagram must be a closed figure. Fn – Total resultant force
M – Mass
 -- Angular velocity
Dynamic Balancing describes the process where primary forces and...