To solve the problem that the attenuation effect of the bladder pressure pulsation attenuator cannot be quantitatively analysed, the dynamic mesh technology was combined with the user-defined function to calculate the serial and parallel attenuators. Overcoming the divergence problem in finite-element fluid calculation and the negative volume problem in the dynamic mesh updating process, the bladder pressure pulsation attenuator was dynamically simulated under different fluctuating frequencies and different inflatable pressures. The results show that a serial attenuator attenuates pressure pulsation better than a parallel one does, especially when the fluid fluctuation frequency is consistent with attenuator’s natural frequency. And the lower the inflatable pressure of the bladder is, the better the attenuation effect is. The simulation results match the experimental results, which verifies the model’s validity and practicability, and also provides a new method and idea to improve bladder attenuator’s perfomance and analyse the variable boundary problem.

为解决膀胱压力脉动衰减器的衰减效果无法定量分析的问题，结合动态网格技术结合用户自定义函数计算串并联衰减器。克服有限元流体计算中的发散问题和动态网格更新过程中的负体积问题，在不同脉动频率和不同充气压力下动态模拟膀胱压力脉动衰减器。结果表明，串联衰减器比并联衰减器更好地衰减压力脉动，尤其是当流体波动频率与衰减器的固有频率一致时。并且膀胱的充气压力越低，衰减效果越好。