Introducing the concept of evolutionary frequency response, the evolutionary spectrum matrix of the random response under zero initial conditions of a time-invariant linear system subject to correlated evolutionary random excitations can be expressed in a concise way, similar to the matrix relationship between the power spectral densities of a stationary random response and the excitation.

An adaptive simulation method for the design of array with frequency invariant response is proposed and is used to construct beamformer matrix to focus a wideband signal.

A theoretical solution on nonstationary random response of SDOF system to ground motion caused by explosion seismic is proposed by means of the theory of evolutionary spectra.

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;

The actuator is expected to have a higher response frequency.