Analysis on Reasons Causing Vibration of Hydraulic Poppet Valve Based on CFD
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摘要: 对插装式液压锥阀建立动态数学模型,同时利用计算流体动力学(CFD)软件对实际使用中产生振动的锥阀及其改进结构进行稳态和动态解析,分析了液压锥阀发生振动的原因。数学建模结果表明:使阀芯开启的稳态液动力是加剧阀芯振动的重要因素之一。CFD稳态计算结果表明:原始结构锥阀对应的稳态液动力随阀芯的开启先增大而后降低,但方向向上,始终存在使阀芯开启的趋势,这可能是引起阀芯发生剧烈振动的原因。动态计算结果表明:改进结构锥阀相对于原始结构的确可以消振,但会产生较大的负压,易于产生气蚀和气蚀噪声。Abstract: The dynamic mathematical model of cartridge inserted hydraulic poppet transient simulations are carried out by CFD software for both practical poppet valve valve is set up. Its steady and vibrating strongly and its modi-fled structures. The reasons causing poppet valve vibration are researched. The modeling analysis result shows that the steady-state hydraulic flow force which makes the valve opening is one of the primary reasons that intensify valve vibration. The steady CFD simulation results show: the steady-state flow force of original poppet valve increases firstly and reduces later with the opening of valve port, but the force's direction is always upward, which makes the spool of poppet valve has the tendency to open, this could be the reason why the valve vibrates strongly. The transi-ent calculation results indicate that the modified valve structures can reduce vibration indeed, but these structures will cause more negative pressure, which may leads to the cavitations and cavitations' noise.
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Key words:
- poppet valve /
- vibration /
- steady-state flow force /
- CFD(computational fluid dynamics)
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