1. Introduction
It is well known that many physical systems can be optimized by using a high-frequency excitation and its applications are numerous in many scientific and engineering fields. For example, the high-frequency excitation in a nonlinear system may have some effects such as stiffening, biasing, smoothening, etc. [1]. When we have a nonlinear system that is perturbed either externally or parametrically by using only a high-frequency excitation, the oscillation of the system can be enlarged at the natural frequency [2], [3] and [4], for the case that the excitation frequency is far larger than the natural frequency of the corresponding linear system. When the nonlinear system is excited by both a low-frequency and a high-frequency excitation, then the high-frequency excitation can induce a resonance at the low-frequency of the weak excitation. In other words, the response of the system to the low-frequency excitation can be greatly enhanced by the high-frequency excitation. This phenomenon was named vibrational resonance (VR) in a paper published by Landa and McClintock in the year 2000 [5]. In the last years, VR has been investigated in many disciplines due to the importance of the two-frequency excitations existing in many different fields [6], [7], [8], [9], [10] and [11]. Most of the work done on VR has been focused on the resonance at the low-frequency excitation.
1. IntroductionIt is well known that many physical systems can be optimized by using a high-frequency excitation and its applications are numerous in many scientific and engineering fields. For example, the high-frequency excitation in a nonlinear system may have some effects such as stiffening, biasing, smoothening, etc. [1]. When we have a nonlinear system that is perturbed either externally or parametrically by using only a high-frequency excitation, the oscillation of the system can be enlarged at the natural frequency [2], [3] and [4], for the case that the excitation frequency is far larger than the natural frequency of the corresponding linear system. When the nonlinear system is excited by both a low-frequency and a high-frequency excitation, then the high-frequency excitation can induce a resonance at the low-frequency of the weak excitation. In other words, the response of the system to the low-frequency excitation can be greatly enhanced by the high-frequency excitation. This phenomenon was named vibrational resonance (VR) in a paper published by Landa and McClintock in the year 2000 [5]. In the last years, VR has been investigated in many disciplines due to the importance of the two-frequency excitations existing in many different fields [6], [7], [8], [9], [10] and [11]. Most of the work done on VR has been focused on the resonance at the low-frequency excitation.
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