A bimorph impedance transducer for multi-directional FRF detection

作者：Hou Xiaoyan^*; Shih Fu Ling; Kok Hui Heng

来源：Measurement Science and Technology, 2007, 18(9): 3009-3018.

DOI：10.1088/0957-0233/18/9/036

• piezoelectric bimorph
• bimorph impedance transducer
• sensor cum actuator (SCA)
• frequency response function
• translational impedance
• rotational impedance
• transduction matrix

This paper reports on a bimorph impedance transducer ( BIT) which can measure multi- directional translational and rotational impedances in multi- directions. Translational and rotational four- pole models are constructed to describe the dynamic behavior of the transducer. Derived from these models, calibration functions are defined and numerically determined under various boundary conditions. Taking advantage of these functions, point translational and rotational impedance of a structure can be easily and accurately determined by measuring the excitation electrical signals applied to the transducer. To verify the effectiveness of the transducer, a two- dimensional plate is utilized as a test structure. The point impedances of the plate in all its three active degrees of freedom ( DOFs) are numerically obtained by the BIT. Through comparing the impedances obtained via BIT with the verification results, it is concluded that the newly designed transducer is accurate in measuring both translational and rotational frequency response functions ( FRFs).

• 出版日期2007-9
• 单位南阳理工学院