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 Ingersoll-Rand has asked Dynamic Acoustics for a solution to a problem with synchronization in their small compactors that are used to pave small areas such as tennis courts and church parking lots.  The compactor has two rotating masses that cause the drums to vibrate.  Unequal frequencies due to unequal pressure differences across the hydraulic motors create an annoying noise.

 DA has come up with three possible solution alternatives including:

      1.)    A parallel flow system

2.)    An extra leakage system

3.)    A system with an additional pump

Using several decision methods including a decision matrix, the parallel design solution has been selected as the best method to solve the problem of unequal frequencies.  The parallel design concept will give equivalent pressure differences across the hydraulic motors while maintaining flow.

 The major components that are needed for the parallel flow design have been specified.  These parts include a flow divider and a pump that outputs less pressure and twice the flow of the current pump that Ingersoll-Rand uses.  The design will synchronize the motors at a slightly less speed that will not be detrimental to the compactor.  Dynamic Acoustics is currently under budget goal of $500 and is happy with the results.