Abstract
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.
Highlights
Research on the similarity of vibration characteristics of naval gun bracket based on similarity theory
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 fi⁃ nite 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
The vibration characteristics of the original model can be esti⁃ mated by analyzing the vibration characteristics of the carrier shrinkage ratio model, which provides a reference for ship gun designers
Summary
{ } δg = wi ,αix ,αiy ,wj,αjx ,αjy , T ∂2 Nly ∂x2 ∂2 Njy ∂y2 2 ∂2 Nly ∂x∂y ùú úúúúúú ûúú ìïwi üï ïïïαix ï ïï íαiy ý ïï ï... ∂2 w ∂x∂y ï þïï éê1 μ 0 ùú êμ ê ëêê0 本文在做 2 块板的模态参数相似关系实验验证 时,原模型 和缩比模型网格划分方式和个数一样。 原模型和缩比模型的测点都是 15 个,用这 15 个测 点的数据来表征振型等模态参数。 而且原模型和缩 比模型的测点位置在直角坐标系下都是一样的,网 格大小一样,如图 6 所示。
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