Vibration Transfer Characteristics and Optimal Design of High-precision Aircraft Periodic Supporting Structure

doi:10.3901/JME.2025.11.162

Abstract

Abstract: With the development of aircraft lightweight, the guidance accuracy has been seriously affected by the low/medium frequency vibration. Based on the band gap characteristics of the periodic truss, the vibration transmission analysis and the vibration reduction optimization design for some high-precision aircraft are carried out. Through the finite element simulation, the influences of material parameters and structural parameters on the band gap of periodic truss are discussed. Combined with the frequency response of vibration transmission and the distribution characteristics of structural band gap, it is found that the vibration reduction frequency can be reduced by increasing the structure length, decreasing the material elastic modulus and improving the material density. On this basis, a periodic truss supporting structure of aircraft is designed which meets the size and strength requirement. Combined with the power flow analysis, the band gap is further optimized. It is finally determined that the supporting truss is composed of five periodic structures made of aluminum alloy and epoxy resin composite. Through the vibration test of the periodic truss, it can be seen that the structure has good vibration reduction performance in the low/middle frequency range, which verifies the feasibility of the optimization method of the structural band gap characteristics. It provides a new way to analyze the vibration transfer characteristics of supporting structures and contributes to improving the vibration reduction performance in engineering practice.

Key words: band structure, band gap, power flow, periodic structure, vibration transfer

CLC Number:

TB53

LIU Haibao, ZU Qun, MA Chicheng, AN Yumin, ZHANG Jingyu, YANG Jianguo, DAI Shijie, ZHAO Libin. Vibration Transfer Characteristics and Optimal Design of High-precision Aircraft Periodic Supporting Structure[J]. Journal of Mechanical Engineering, 2025, 61(11): 162-170.

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