相幅法测量受迫振动共振频率

Determination of resonant frequency of forced and damped vibrating system by phase-amplitude approach

介绍了一种测量共振频率的方法.通过结合系统在受迫共振时的相位和幅度特性,提高了振动响应的对比度,降低了干扰的影响,能更精确测定系统的共振频率.这种测频方法能广泛运用于其它有类似幅频相频特性的系统.

A method to determine the resonant frequency of forced and damped vibrating system is introduced.After combining the amplitude-frequency with the phase- frequency characteristics of the vibrating system,we enhance the response contrast ratio and minimize the jamming signal of the vibrating system so as to get higher accuracy resonant frequency. This method can be used to other systems which have similar relationship of amplitude- frequency and phase-frequency.