螺栓位置与换能器有效机电耦合系数的关系

研究了螺栓在换能器中部或后部(后置)位置时,对有效机电耦合系数的影响。将螺栓等效为T型四端网络,利用换能器的机电等效电路,全面分析了其对应的有效机电耦合系数与螺栓长度之间的变化关系。结果表明,螺栓处于中部时,换能器的机电耦合系数与螺栓长度呈正相关趋势;螺栓位于后端时,换能器的机电耦合系数与螺栓长度先呈正相关变化,随后呈负相关变化;相比于螺栓位于中部,后置螺栓长度的变化对有效机电耦合系数的波动比较大,但有机电耦合效率的系数数值均比中部位置螺栓的值小。这说明螺栓置于中部时机电耦合性能更好。

Relationship between the bolt position and the effective electromechanical coupling coefficient of transducer

In this paper, the influence of the bolt position, which is in the middle or at the back of a transducer, on the effective electro-mechanical coupling coefficient of the transducer is studied. Considering that the bolt is equivalent to a T typed four-terminal network, the relationship between the effective electromechanical coupling coefficient and the bolt length is analyzed according to the electromechanical equivalent circuit of transducer. The results show that the electromechanical coupling coefficient monotonically increases with increasing the length of the bolt located in the middle of the transducer; however, it increases first and then decreases with increasing the length of the bolt located at the back of the transducer. The variation of the effective electromechanical coupling coefficient with changing the length of the bolt located at the back is more obvious, but its value is all lower than that of the bolt located in the middle, which illustrates that the electro-mechanical coupling performance of a transducer is better for the bolt located in the middle of the transducer.