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提出了一种一端输入多端输出等幅振动的纵振动方向变换体。变换体由输入杆、半球形过渡体和输出杆组成,通过半球形过渡体将一个输入杆与多个输出杆耦连为一体,并且多个输出杆呈立体分布,可实现一端纵振动输入多个方向上纵振动均匀输出。利用振动变换体端面的自由边界条件,以及各组件连接处的纵向位移、纵向力、横向位移和转角连续条件,推导了纵振动方向变换体的频率方程。解析计算了不同几何尺寸的纵振动变换体的谐振频率,与有限元法的计算值及实验测试值基本吻合。将纵振方向变换体的输入端与谐振频率为19.8 kHz的换能器相连,利用激光测振仪测试了纵振动变换体各输出端振型及各输出端相对于输入端的振幅放大系数,结果显示纵振动经过方向变换体成功地传输到了变换体的各输出杆的端面,且各输出端的振幅基本相等。
A kind of longitudinal vibration direction transformation body with one-end input multi-amplitude output amplitude vibration is proposed. The transformation body is composed of an input rod, a hemispherical transition body and an output rod. An input rod and a plurality of output rods are coupled through a hemispherical transition body, and a plurality of output rods are three-dimensionally distributed so as to input one end longitudinal vibration The direction of longitudinal vibration output evenly. Based on the free boundary condition of the end face of vibration transducer and the longitudinal, longitudinal, transverse and angular continuous conditions at the joints of each module, the frequency equation of longitudinal transducer is deduced. The resonant frequencies of longitudinal vibration transducers with different geometrical dimensions are analyzed and calculated, which are in good agreement with the calculated values of the finite element method and experimental values. The input end of longitudinal transducer is connected with the transducer whose resonant frequency is 19.8 kHz. The vibration amplitude of each output of the longitudinal transducer and the amplifying factor of each output are tested by laser vibrometer. As a result, It is shown that the longitudinal vibration has been successfully transmitted to the end faces of the output rods of the change-over body through the direction changing body, and the amplitudes at the respective output ends are substantially equal.