Vibrational testing and correlation

Abstract

Methods of vibration testing a component are provided. In a model of the component, define alignment points corresponding to physical features and define measurement points at positions which vibrate when excited at predefined excitation frequencies (f), the excitation frequencies (f) each corresponding to one or more vibrational modes. On the component measure the position of the physical features corresponding to the alignment points in the model and calculate the position of the laser source. Excite the component at an excitation frequency and measure the amplitude of vibration at each measurement point. Extract the mode shape from the measured vibration amplitudes. In the model, rotate a local co-ordinate system (x, y, z) at each measurement point until one axis is directed towards the laser source. Extract the mode shape from the component model. Compare the mode shapes extracted from the model and from measured vibration amplitudes.