| 摘要 |
PURPOSE:To determine a transfer function at the time of actual operation of the object to be measured accurately and to make it possible to evaluate the extended force of unknown applied vibrating force, by memorizing the result of Fourier spectrum ensemble averaging operation in a transmission function spectrum analyzer, and performing subtraction operation, complex multiplication, and the like. CONSTITUTION:The vibration response of a moving blade 0 of an axial rotary machine and the like through a pickup 2 is processed in a high speed Fourier transformation operation part 7 and the Fourier spectrum ensemble average operation part 8, and a Fourier transformation vibration response delta(omega) is stored in a memory part 9. Under the same operating state, impulse vibration is applied by a hammer 1, and a Fourier transformed vibration signal Fa(omega) and a vibration response signal are stored in the memory part 9. Based on these stored values, operation processing is performed in a subtracting operation part 10, a complex operation part 11, and a complex operation part 12. Thereafter the inverse high speed Fourier transformation is performed. Then the transfer function H(omega) at the time of actual operation in accurately determined based on expressions I and the evaluation of the external force Fa(omega) of the unknown applied vibrating force is performed. In the expression, deltaa is a substantial response component of the impulse vibration. |
