1. VIRTUAL BALANCING EQUIPMENT FOR RIGID ROTORS BY: Ricardo Jaramillo M. Daniel Jaramillo J.

2. BALANCING THEORY VIRTUAL BALANCER

3. BALANCING DEFINITION Balance: To change the mass distribution of a rotor in such way that the axis of rotation and the axis of inertia coincides. Inertia Axis Rotation Axis UNBALANCED ROTORBALANCED ROTOR Added Weights Rotation and Inertia Axes

4. SOME CAUSES OF UNBALANCE Excentricities during design or fabrication. Fabrication defects (porosities) Wear, corrosion or dirt. Distortion

5. HOW IT IS CORRECTED ADDING WEIGHT REMOVING WEIGHT

6. TYPES OF UNBALANCE STATIC UNBALANCE DYNAMIC UNBALANCE The axes of inertia and rotation are parallel CORRECTED BY ONE PLANE BALANCING PROCEDURE CORRECTED BY TWO PLANE BALANCING PROCEDURE The axes of inertia and rotation are skew W << D W is not << D

7. PARAMETERS TO MEASURE 1. Angular Velocity. 2. Vibration Amplitude at 1 x RPM. 3. Phase of Vibration at 1 x RPM relative to Rotor. 1 & 3  Strobe light or Photocell. 2 & 3  Acelerometers, sismic pickup and proximity probes

8. SYSTEM CONFIGURATION

9. MAIN MENU

10. ACQUISITION

11. TRIAL WEIGHTS CALCULATOR

12. CALCULATING MODULE

13. AXIAL TRANSLATION

14. Balance Quality of Rotating Rigid Bodies ISO 1940

15. PLATES & HOLES CALCULATION

16. DETAILED REPORT

17. SYSTEM FEATURES Operating System: Windows 9X Number of VIs : 127 ( 37 from LabVIEW ) Number of Front Panels: 19 Size after compilation: 3 MB LabVIEW Version: 5.1 PC Minimum Requirements: Pentium 100 MHz and 16 MB Ram.