一种锥形节流阀工作过程流-固耦合动力学响应的影响因素分析
发布时间：2018-07-21 21:05
【摘要】：基于三维流-固耦合有限元动力学仿真分析模型和直接耦合算法,分析了一种锥形节流阀在入口流速脉冲激励下由关闭状态开启而后重新关闭全过程的流量特性、压差特性及阀门开度的高频波动等非线性动力学响应特性,并采用小波分析方法等对阀门开度响应等进行了时-频域分析。选择不同的流体-结构模型的数值积分方法组合及时间步长对流-固耦合动力学求解算法进行了实际应用检验;然后对阀芯质量、弹簧参数与油液参数等系统参数以及激励速度幅值与脉宽等激励参数对其工作过程动力学响应的影响进行了细致的数值分析比较。结果表明:流体模型积分算法的选择对流-固耦合计算结果的影响较大;对该阀而言,阀芯质量与油液体积弹性模量的改变对阀芯振动频率的影响较为显著,油液粘度的改变对阀门开启的滞后量及振动相位的影响较大,而弹簧刚度及预紧力的改变对阀门的最大稳定开度的影响较大;阀芯与阀座间的碰撞使阀芯的振动频率提高。
[Abstract]:Based on the three-dimensional fluid-solid coupling finite element dynamic simulation model and direct coupling algorithm, the flow characteristics of a tapered throttle valve opened by closing state and then re-closed under the excitation of inlet velocity pulse are analyzed. The characteristics of pressure difference and nonlinear dynamic response such as high frequency fluctuation of valve opening are analyzed in time-frequency domain by wavelet analysis method. The numerical integration method combination of different fluid-structure models and the time-step convection-solid coupling dynamics solution algorithm are selected for practical application. The effects of system parameters such as spring parameters and oil parameters as well as excitation parameters such as amplitude of excitation velocity and pulse width on the dynamic response of the working process are analyzed and compared in detail. The results show that the choice of fluid model integration algorithm has a great influence on the results of convection-solid coupling calculation, and for the valve, the changes of the valve core mass and the bulk elastic modulus of oil have a significant effect on the vibration frequency of the valve core. The change of oil viscosity has a great influence on the opening delay and vibration phase of the valve, while the change of spring stiffness and pretightening force has a great influence on the maximum stability opening of the valve, and the vibration frequency of the valve core is increased because of the collision between the valve core and the valve seat.
【作者单位】： 清华大学汽车工程系;
【基金】：国家973项目
【分类号】：TH137.52
，
本文编号：2136855
[Abstract]:Based on the three-dimensional fluid-solid coupling finite element dynamic simulation model and direct coupling algorithm, the flow characteristics of a tapered throttle valve opened by closing state and then re-closed under the excitation of inlet velocity pulse are analyzed. The characteristics of pressure difference and nonlinear dynamic response such as high frequency fluctuation of valve opening are analyzed in time-frequency domain by wavelet analysis method. The numerical integration method combination of different fluid-structure models and the time-step convection-solid coupling dynamics solution algorithm are selected for practical application. The effects of system parameters such as spring parameters and oil parameters as well as excitation parameters such as amplitude of excitation velocity and pulse width on the dynamic response of the working process are analyzed and compared in detail. The results show that the choice of fluid model integration algorithm has a great influence on the results of convection-solid coupling calculation, and for the valve, the changes of the valve core mass and the bulk elastic modulus of oil have a significant effect on the vibration frequency of the valve core. The change of oil viscosity has a great influence on the opening delay and vibration phase of the valve, while the change of spring stiffness and pretightening force has a great influence on the maximum stability opening of the valve, and the vibration frequency of the valve core is increased because of the collision between the valve core and the valve seat.
【作者单位】： 清华大学汽车工程系;
【基金】：国家973项目
【分类号】：TH137.52
，
本文编号：2136855
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