In this article, nonlinear (logarithmic) averaging techniques is proposed as an alterative averaging technique for frequency response data, which produces almost unbiased estimate as long as the signal to noise ratios(SNR) is sufficiently high.

Detection of offshore platform structure crack based on frequency response function;

Conventional methods using frequency response functions are effective to detect single damage, but are difficult to identify multiple damage locations and extents.

Considering that frequency response function can entirely present the essential character of underlying system, when the operating condition is varied, the change in frequency response can be utilized to realize the effective model matching and proper switching for multi-model system, which provides a novel strategy to solve switching control pro.

This paper introduced the parameter frequency response method,developed ship rolling frequency response function equipped with two U-tube anti-rolling tanks with different natural frequencies,analyzed the tank parameters relative to rolling frequency response amplitude,and researched the effect of tank parameters on the ship rolling amplitude.

The relationship between structure of polyurethane foam sandwich panels and the frequency response;

Frequency responses of the surface-acoustic-wave driving single-electron-transport device;

Analysis of frequency response of aero-engine flame-basket under dynamic load;

A study of the practical value of resonance frequency impulse oscillometry on small airway obstruction;