Abstract
A method for establishing the multi-scale cutting force spectrum under complex random load history is presented according to the non-stationary random characteristics of the cutting force-time history. The IMF components of different time scales are obtained by EMD decomposition of complex random cutting force-time history data. The probability density distribution of cutting force in certain frequency band is obtained as the load spectrum on this time scale. This method avoids the disadvantage of the conventional method that the load or stress is regarded as a constant or variable amplitude load under one frequency to establish the load spectrum. The method for establishing the multi-scale load spectrum can provide a basis for fatigue life calculation and fatigue reliability analysis of mechanical components.
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