20-04-2012, 03:39 PM
Detection of Machine Imbalance
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INTRODUCTION
Machine imbalance has become a big vibrational problem especially with modern turbomachineries, where the problem may induce losses due to down time of turbomachineries. In this experiment, a rotor kit, as shown in Figure 1, resembling a turbomachinery is purposely made imbalance to simulate the problem. Students are exposed to the significance of the problems and also fundamental approach to the solution of the problems.
At the completion of the labs, students should be able to achieve the following LO’s and PO’s
LO1: Analyzing free and force (harmonic) vibration for single and multi degree of freedom systems (cognitive-analyzing, Level:4)
PO1 - Ability to acquire and apply fundamental principles of science and engineering
PO2 - Capability to communicate effectively
PO3 - Acquisition of technical competence in specialized areas of engineering discipline
PO4 - Ability to identify, formulate and model problems and find engineering solutions based on a system approach
OBJECTIVE
To study the vibration of the rotor kit cause by the imbalance using FFT Spectrum
INTRODUCTION
This Lab experiment requires to use the Signal Analyzer (Refer Figure 2) integrated with the industrial accelerometer (ASH201) to measure frequency, velocity and acceleration of the rotor system in X and Y directions under different imbalance loadings. Decide a suitable range and increment of loadings and number of experiments to conduct.
Develop the best way of writing down the data obtained from the experiment in order to present the reduced data and use of computer software applications to analyze the data are encouraged.
Procedure
1. OneProd MVP-2C Signal Analyzer is shown in the figure above.
2. The analyzer is turned on and ‘Expert Module’ mode is selected.
3. In the route screen, the ‘OFF ROUTE’ is selected. Then, either ‘FFT-ACC’ or ‘FFT-VEL’ will be selected for acceleration or velocity unit.
4. A radial vibration collection is made in Y direction by placing ASH201-A industrial acceleration sensor on the bearing ease of the rotor kits for damaged bearing condition.
5. A radial vibration collection is made in X direction by placing ASH201-A industrial acceleration sensor on the bearing ease if the rotor kits for damaged bearing condition.
6. A radial vibration collection is made in Y direction by placing ASH201-A industrial acceleration sensor on the ease of the rotor kits for foundation stiffness looseness.
7. A radial vibration collection is made in X direction by placing ASH201-A industrial acceleration sensor on the bearing ease of the rotor kits for foundation stiffness looseness.
8. Velocity or acceleration is measured in desired direction, ASH201-A industrial acceleration sensor is placed on the bearing casing accordingly.
9. Velocity and acceleration are shown in the figures below.