Transactions of Nanjing University of Aeronautics & Astronautics
Sensitivity Analysis and Optimization of Geometric Parameters of a New Fluid Bag Buffer Mechanism on Buffering Performance
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Abstract:
A new fluid bag buffer mechanism， which can provide large axial stiffness under the small displacement， is designed. The dynamic change laws of the mechanism stiffness and the internal pressure of the fluid bag are studied when it is subjected to impact load. According to the protection performance for the flexible joint and the pressure change in the fluid bag during the impact process， the sensitivity of the geometric parameters of the fluid bag to the axial stiffness is analyzed by using the orthogonal experimental method， and the optimal parameter combination of the geometric parameters of the fluid bag under impact is obtained， leading to the displacement of the inner shell reduce by 41.4%. The results show that the internal pressure of the fluid bag is a rising process of oscillation and fluctuation. The sensitivity of the geometric parameters of the fluid bag to the displacement of the inner shell from high to low is as follows： Height H， radius r， wall thickness t， chamfer A. The correlation between the geometric parameters of the fluid bag and its internal pressure is： H is negatively correlated with the internal pressure， while the r， t， and A are positively correlated with the internal pressure.
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This work was supported by the Fundamental Scientific Research Business Expenses of Central Universities （No.NJ2020024）.
Clc Number:
TH135
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