Simulation Experiment on the Influence of Geometric Structure Design of Resonant Tube on Static Stress Distribution and Resonant Frequency

The resonant tube is a key component in thermoacoustic refrigeration machines. Studying the geometric structure of the resonant tube on its static stress distribution, modal and natural frequency can improve the working performance of the resonant tube. This article starts with the working principle and geometric structure design of the resonant tube, then establishes a resonant tube model and analyzes the influence of alternations in the geometric structure parameters of the resonant tube on its static stress distribution and resonant frequency. The research results indicate that the equivalent stress of the mutant resonant tube is the smallest compared to the gradient resonant tube; The resonant frequency of the resonant tube slowly increases with the increase of the opening angle, and rapidly decreases with the increase of the tail cavity radius. Based on the conclusions above, this article explores a method for designing a resonant tube with a specific resonant frequency: by adjusting the geometric parameters of the resonant tube, its resonant frequency will continuously alter and gradually approach the acoustic driving frequency to achieve resonance and output the maximum acoustic pressure. This design method provides important theoretical basis for the design of resonant tubes in practical engineering applications.