A PERFECT OPAX METHOD FOR VIBRATION TRANSFER PATH ANALYSIS COMBINED WITH OTPA METHOD

Traditional OPAX method for vibration transfer path analysis has two drawbacks: (1) errors are caused by isolation simplification; (2) much job is needed to be done in measuring the excitation to the target transfer function. Although Operational transfer path analysis method (OTPA) will give wrong results when there is obviously signal crosstalk in reference channels, its measurement procedure is very easy for there is no need in measuring force to velocity transfer function. A perfect OPAX method was put forwards in this paper, which combines OPAX method with OPTA method. It uses the four-terminal parameters of the isolator to set up a more reasonable reference signal, the reference signal is combine by the top and lower vibration velocity of the isolator and induces no crosstalk error. Simulations were done and its validation was proved.