PRECORRECTION OF ON-LINE MEASURED DATA AND MODAL ANALYSIS OF MACHINE TOOL STRUCTURES

摘要

In this paper the effect of coherent noise on the result of modal analysis is discussed. Based on the theory of multi-input process a formula for measured data precorrection is derived. By such precorrection the bias errors, caused by coherent input noises, can be eliminated and the result of modal analysis becomes more accurate. Good agreement between the prediction of machining chatter during the cutting tests on five lathes has proved the validity of this method.