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In a delayed system excited by low-frequency and high-frequency signals,the necessity of the high-frequency signal on the resonance is discussed.By adjusting the delay time,the resonance occurs in a wide scope of frequencies,including the primary,subharmonic and superharmonic frequencies.Only for very few cases does the high-frequency signal have a positive effect on the resonance.It is the traditional vibrational resonance phenomenon.In most situations,the high-frequency excitation is unnecessary for the resonance.An appropriate delay,rather than the high-frequency signal,is the key factor in improving the weak low-frequency signal.
In a delayed system excited by low-frequency and high-frequency signals, the necessity of the high-frequency signal on the resonance is discussed. By adjusting the delay time, the resonance occurs in a wide scope of frequencies, including the primary, subharmonic and superharmonic frequencies. Ofly for the high-frequency signals have a positive effect on the resonance. It is the most vibrational resonance phenomenon. In most situations, the high-frequency excitation is unnecessary for the resonance. Ann appropriate delay, rather than the high-frequency signal, is the key factor in improving the weak low-frequency signal.