Similarity Analysis and Target Strength Correction of Non-Proportional Scaled Models Based on Highlight Model Theory

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Authors

  • Jin Zhang Beijing Institute of Technology / Jiangsu Automation Research Institute, China
  • Zhenyu Li Jiangsu University of Science and Technology, China
  • Yinhao Li Jiangsu University of Science and Technology, China
  • Zilong Peng Jiangsu University of Science and Technology, China

Abstract

Acoustic scattering scale models often fail to meet the acoustic similarity design requirements due to limitations in fabrication technology, testing facilities, and safe transportation, which restrict the accurate extrapolation of acoustic scattering characteristics between scaled models and full-scale ships. To overcome this challenge, the present study applies highlight model theory to perform acoustic similarity analysis and to correct the local target strength of simple objects in the model based on overall acoustic scattering correction. A novel method for correcting the target strength of non-proportional scaled models is proposed. The method is validated using various model geometries, including ellipsoids, finite-length cylinders, truncated elliptical cones, and complex structures. Additionally, the plate element method is employed for target strength correction and scaling conversion analysis for non-proportional scaled models. The study highlights the variation in target strength due to changes in geometric dimensions and demonstrates the effectiveness of the proposed correction method. The results indicate that the proposed correction approach allows for more accurate extrapolation of target strength from non-proportional scaled models to full-scale prototypes, thereby better satisfying the requirements of practical engineering applications.

Keywords:

acoustic scattering, similarity theory, highlight theory, scaled model

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