Research on the similarity of vibration characteristics of naval gun bracket based on similarity theory

• Published in: Xibei Gongye Daxue Xuebao Vol. 39; no. 5; pp. 1150 - 1157
• Main Authors: GONG, Junjun, FU, Wei, ZUO, Yuanhao, MA, Jiarui, DING, Heping
• Format: Journal Article
• Language: English; Chinese
• Published: EDP Sciences 01.10.2021
• Subjects: bracket; model test; naval gun; similarity theory; vibration characteristics
• DOI: 10.1051/jnwpu/20213951150
• ISSN: 1000-2758

The similar scale model experiment can provide some reference for the research and development of naval gun weapons. This paper takes the naval gun bracket as an example to explain. Based on the dimensional analysis, equation analysis and finite element method, the modal parameter similarity relationship between the original model for bracket and the shrinkage ratio model is established. The results show that the error of predicting the natural frequency of the original model based on similarity relation is less than 2% comparing with the results of finite element numerical simulation, and the error is less than 10% comparing with the experimental results, and the mode of shrinkage model is close to that of the original model. It is proved that the theoretical method in this paper is feasible and practical in engineering. Therefore, the vibration characteristics of the original model can be estimated by analyzing the vibration characteristics of the carrier shrinkage ratio model, which provides a reference for ship gun designers. 采用相似比例模型实验可以为舰炮武器研发提供一定的参考。以舰炮托架为例进行说明。通过量纲分析法、方程分析法以及有限单元法建立了托架原模型和缩比模型之间的模态参数相似关系，设计了缩比尺寸为1∶2的托架实验模型，进行了数值仿真与实验验证。结果表明：基于相似关系预估原模型的固有频率与有限元数值仿真的结果相比误差在2%以内，与实验结果相比误差在10%以内；缩比模型与原模型的振型较为接近。证明文中理论方法是可行的，具有工程实用性。因此可以通过分析托架缩比模型的振动特性来预估原模型的振动特性，为舰炮设计人员提供了参考。