【摘要】 机械系统中响应速度与激励力之比称为机械导纳即速度导纳。速度导纳对于分析系统特性十分重要。本文提出用激励电压代替激励力,利用H ilbert变换求出超声换能系统在正弦扫频激励下,系统激励电压和响应速度的模及相位,从而得到系统的速度导纳圆。这提供了一种有效的分析复杂系统特性的方法。实验证明,与有效值法相比,该方法具有较强的抗干扰性。更多还原

【Abstract】 Mechanical admittance can be defined as the response speed upon the exciting force or voltage of a system.Using Hilbert transform both magnitude and phase of the exciting and response can be obtained.Then the mechanical admittance circle of PZT system can be determined.This offers a way to characterize complex systems such as ultrasonic bonding system.Experimental research shows that Hilbert transform is more accurate and reliable than the traditional method.更多还原