Impulse Frequency Response Analysis (IFRA), as one diagnostic method of Frequency Response Analysis (FRA) which calculates and computes frequency dependent variables of the windings, is becoming a popular technique used to externally monitor and assess the condition and mechanical integrity of transformer winding.

A multi microphone impulse response method is presented to study the absorption coefficient of the structures with various surfaces, by which the orientation effect of reflection and scattering ca.

The impulse response method is employed to analyse the effect of aortic valve on the cardiovascular coupling in this paper.

Based on the parameters that identified by frequency response method,a disturbance observer was used to estimate the disturbance generated by the variation in model parameters and load in AC servo system.

The paper introduces a complete procedure using frequency response method to test the distortion of transformer s winding, including the principle, the determination of frequency, range, testing points, and criteria.

The model parameters of the motor speed-loop were identified with the frequency response method,the disturbance,that was produced by variation of system parameters,machinery nonlinear etc,was estimated,and which was feedback to input port as a compensation signal.

Then impulse response method in time domain of linear vibrating system is applied in the system,the response of localized nonlinear vibrating system was obtained by convolution integration between unit impulse response of corresponding linear system and equivalent nonlinear force,and numerical simulation of the model is attained.