Understanding the effect of hammering process on the vibration characteristics of cymbals

13th International Conference on Motion and Vibration Control; 12th International Conference on Recent Advances in Structural Dynamics

Kuratani, F.^1 ; Yoshida, T.^1 ; Koide, T.^2 ; Mizuta, T.^3 ; Osamura, K.^4

Department of Mechanical Engineering, University of Fukui, 3-9-1 Bunkyo, Fukui

910-8507, Japan^1

Koide Works, Ltd. (Koide Cymbals), 1-22-32 Kamisyoukakuji, Hirano-ku, Osaka

547-0006, Japan^2

Osaka Alloying Works, Co. Ltd., 45-5-9 Shirakata, Fukui

910-3138, Japan^3

Research Institute for Applied Sciences, Sakyo-ku, Kyoto

606-8202, Japan^4

关键词: Basic shapes;    Modal strain energy;    Percussion instruments;    Sound radiation efficiency;    Spin-forming;    Vibration characteristics;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/744/1/012110/pdf
DOI  :  10.1088/1742-6596/744/1/012110

来源: IOP

【 摘 要 】

Cymbals are thin domed plates used as percussion instruments. When cymbals are struck, they vibrate and radiate sound. Cymbals are made through spin forming, hammering, and lathing. The spin forming creates the basic shape of the cymbal, which determines its basic vibration characteristics. The hammering and lathing produce specific sound adjustments by changing the cymbal's vibration characteristics. In this study, we study how hammering cymbals affects their vibration characteristics. The hammering produces plastic deformation (small, shallow dents) on the cymbal's surface, generating residual stresses throughout it. These residual stresses change the vibration characteristics. We perform finite element analysis of a cymbal to obtain its stress distribution and the resulting change in vibration characteristics. To reproduce the stress distribution, we use thermal stress analysis, and then with this stress distribution we perform vibration analysis. These results show that each of the cymbal's modes has a different sensitivity to the thermal load (i.e., hammering). This difference causes changes in the frequency response and the deflection shape that significantly improves the sound radiation efficiency. In addition, we explain the changes in natural frequencies by the stress and modal strain energy distributions.