The dynamic characteristics of negative stiffness Duffing system with delayed feedback control are investigated. Choosing time delay as the control parameter
the stability of trivial equilibrium is discussed by analyzing distribution of the roots of the associated characteristic equation. It is found that Hopf bifurcation occurs from trivial equilibrium when the delay passes through critical values
then the critical values and their relations with system control parameters are obtained. The effect of time delay on the forced vibration of system is evaluated with numerical method. The results show that the amplitude of stable period motion increases
some complex dynamical behaviors such as quasi-periodic motion and multiple periodic motion may occur
and the system gets out of control with the increase of time delay. Therefore the effect of time delay ought to be taken into sufficient consideration in the design of system control loop.
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references
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