everything that rotates
                        needs to be balanced



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test results introduction - Page 2 of 4

engine fanThe primary cause of engine cooling fan vibration is mass imbalance due to manufacturing tolerances. Factory balancing is usually done after the fans come off the production line. This process is expensive, time consuming and does not account for balancing that may be required once the fan is in use. During normal operation, erosion and debris build-up can also contribute to the mass imbalance, leading to violent vibration.

Test Objective

The objective of the test was to determine the impact that an XYO system would have on the vibration of engine cooling fans (Figure 2).

Test Overview

Vibrations were measured with two velocity probes on the shroud (Figure 3). engine fanengine fan

The prototype XYO balancer was designed with a compensating capacity of 180g.mm; however, the XYO balancer capacity can be designed for larger imbalances if desired. The XYO balancer was installed inside the hub of the impeller, as shown in Figure 4.

Four different mass imbalances were tested with and without the XYO balancer installed on the engine fan:

  • 0g.mm imposed imbalance
  • 100g.mm imposed imbalance
  • 183g.mm imposed imbalance
  • 265g.mm imposed imbalance (over capacity)

A small screw and several nuts were used as imbalance masses and were positioned on the impeller as illustrated in Figure 5. The fan was allowed to run at an operating speed of 2000 RPM.

washing machine Industrial Fan imbalance angle grinder cd rom boat prop drive shaft fan compressor

Reports Under Development:

ic engine centrifuge