双稳调参高频共振机理

针对双稳系统的高频信号响应,探讨了双稳调参的高频共振机理.研究表明,二次采样频率变换并不改变双稳结构直接在原系统结构上在与高频映射对应的低频处实现共振,而双稳系统参数调节是调参改变双稳结构并直接在高频处实现共振.双稳系统参数调节之所以能够实现高频随机共振,是因为同时调节双稳系统两参数可使Kramers逃逸速率不存在极限值,突破了随机共振信号频率必须在小频率范围内的限制. 关键词： 双稳系统 高频共振 二次采样频率变换 系统参数调节

Mechanism of high frequency resonance of parameter-adjusted bistable system

For clarifying the response of a bistable system to a high-frequency signal, the mechanism of high-frequency resonance with parameter-adjusted bistable system is investigated. It was shown that the method of twice sampling frequency transformation does not change the bistable system structure to realize resonance at the low frequency corresponding to the high frequency, and that the method of tuning bistable system parameters can directly realize resonance at the high frequency through adjusting the system parameters to change the system structure. The reason for the realization of high-frequency stochastic resonance of tuning system parameters is that adjusting the two parameters of the bistable system simultaneously leads to no limiting value for Kramers rate, and hence the limitation of stochastic resonance frequency within small frequency range is broken through.