The dynamic characteristics of a lathe machine tool structure such as natural frequencies and modes of vibration are experimentally investigated by applying the impulse testing method.
The method to be used is that the impulse input is applied to the lathe structure by a hand-held hammer with the load cell attached to it while an accelerometer is mounted on the lathe structure in a single direction to detect the impulse response signal.
Then the frequency response function is calculated via the Fast Fourier Transform algorithm using digital computer.
Finally, some dominant natural frequencies and mode shapes of vibration are obtained using the so called one degree of freedom model.
