Decomposition with LMD of Mechanical Fault Signals Based on LabVIEW

The local mean decomposition is able to diagnosis non-stationary signals in mechanical fault, and it has important theoretical meaning and practical value. This paper first introduces the method of local mean decomposition, and then proposes the improved LMD. The improved LMD uses cubic spline interpolation to get the local mean function and envelope estimation function. What’s more, the simulated signal is analyzed by this algorithm with the LabVIEW virtual instrument development platform. The result shows that the computation efficiency of the improved LMD is obviously higher than that of the original. Finally this paper uses improved LMD analyze the rolling bearing with out-race fault, and the result conforms to the reality.