Vibration mode of Guzheng resonance panel with whole board structure

  Objective  The performance effect of Guzheng is not only related to the skill of performer, but also closely related to the structure of Guzheng itself. Among them, the resonance panel receives the vibration of string and causes the resonant sound, which is a crucial part of the sound process of Guzheng. In this study, the acoustic vibration performance of Guzheng resonance panel with whole board structure was studied by different analysis methods.

  Method  The experimental modal analysis of the resonant panel was carried out by ZSDASP signal acquisition and analysis software, and the characteristics and laws of the resonance frequencies of each order and the corresponding mode shapes were obtained. A three-dimensional model of the resonance panel of the whole board structure was established, and the computational modal analysis was carried out to verify the feasibility of the computational modal analysis applied in this study.

  Result  Through modal analysis experiment and computational modal analysis, it was found that with the increase of vibration order, the mode shapes of the resonant panel of the whole board structure tended to be more complicated, and the corresponding resonance frequency gradually increased. In the modal experiment results, the resonance frequencies of (0, n), (1, n) and (2, n) orders were easier to identify; the mode shapes corresponding to the (0, n) order were relatively clear and easy to identify, but the mode shapes corresponding to the lower orders of (1, n) and (2, n) were not obvious. The modes corresponding to each frequency that can be identified by the computational modal were (1, n) and (2, n), which were missing (0, n) compared with the experimental modal results. But the results obtained by computational modal analysis were more continuous, and all orders of (1, n) and (2, n) can be identified. Several orders were not obvious enough in experimental modal analysis.

  Conclusion  The results of computational modal analysis are compared with the experimental modal results, and it is concluded that the computational modal analysis is feasible to be applied to the vibration modal research of the resonant panel of the whole board structure of Guzheng.