摘要
含推进剂贮箱在高量级冲击载荷作用下会产生强烈的流固耦合振动,严重时可能引起结构破坏。为准确预示充液贮箱的冲击响应,揭示贮箱内流固耦合振动机理,采用光滑粒子流体动力学(SPH)方法与结构有限元方法,建立了充液贮箱耦合动力学模型,计算了不同载荷量级与充液比的贮箱加速度时程,并与实验结果进行对比。结果表明:高量级、高充液比下贮箱的加速度响应发生剧烈波动;就计算贮箱而言,满充液比下,载荷量级达到-3 dB时出现波动,峰值为5.33 g;0 dB载荷量级下,充液比达到75%时出现波动,峰值为7.82 g;0 dB载荷量级下满充液贮箱的波动最为剧烈,峰值计算值达到24.24 g,该值与实验结果对比,误差仅为2.78%。通过分析冲击过程中流体与结构的运动规律可知,冲击后加速度响应波动是由流体和贮箱壳体二者分离后产生的剧烈碰撞所引发。
A propellant tank will generate strong fluid-solid coupled vibration under the high-magnitude impact load,which may cause structural damage in severe cases.In order to precisely predict the impact response of liquid-filled tanks and reveal the mechanism of fluid-solid coupled vibration inside it,a coupled dynamics model of the liquid-filled tank was established by adopting smooth particle hydrodynamics(SPH)in combination with the structural finite element method.Acceleration results of the tank with different loading magnitudes and filling ratios were calculated and compared with those obtained from experiments.The results show that the acceleration response of the tank fluctuates sharply under a high magnitude load with a high filling ratio.For the calculated tank,the fluctuation occurs when the magnitude reaches-3 dB at a full filling ratio,with a peak value of 5.33 g.The fluctuation also occurs when the filling ratio reaches 75% at 0 dB,with a peak value of 7.88 g,while the most obvious fluctuation appers at 0 dB with a full filling ratio,with the peak value of 24.24 g,which is only 2.7% off from the experimental results.By analyzing the motion pattern of fluid and structure during the impact period,it can be seen that the fluctuation of acceleration response after the impact is triggered by the violent collision of fluid and shell after the separation between them.
作者
张轩
王旭阳
徐自力
薛杰
王珺
ZHANG Xuan;WANG Xuyang;XU Zili;XUE Jie;WANG Jun(State Key Laboratory for Strength and Vibration of Mechanical Structures,School of Aerospace Engineering,Xi'an Jiaotong University,Xi'an 710049,China;National Key Laboratory of Aerospace Liquid Propulsion,Xi'an Aerospace Propulsion Institute,Xi'an 710100,China)
出处
《火箭推进》
CAS
北大核心
2024年第3期19-27,共9页
Journal of Rocket Propulsion
基金
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