一種錐形節(jié)流閥工作過程流-固耦合動力學響應的影響因素分析
發(fā)布時間：2018-07-21 21:05
【摘要】：基于三維流-固耦合有限元動力學仿真分析模型和直接耦合算法,分析了一種錐形節(jié)流閥在入口流速脈沖激勵下由關閉狀態(tài)開啟而后重新關閉全過程的流量特性、壓差特性及閥門開度的高頻波動等非線性動力學響應特性,并采用小波分析方法等對閥門開度響應等進行了時-頻域分析。選擇不同的流體-結構模型的數(shù)值積分方法組合及時間步長對流-固耦合動力學求解算法進行了實際應用檢驗;然后對閥芯質(zhì)量、彈簧參數(shù)與油液參數(shù)等系統(tǒng)參數(shù)以及激勵速度幅值與脈寬等激勵參數(shù)對其工作過程動力學響應的影響進行了細致的數(shù)值分析比較。結果表明:流體模型積分算法的選擇對流-固耦合計算結果的影響較大;對該閥而言,閥芯質(zhì)量與油液體積彈性模量的改變對閥芯振動頻率的影響較為顯著,油液粘度的改變對閥門開啟的滯后量及振動相位的影響較大,而彈簧剛度及預緊力的改變對閥門的最大穩(wěn)定開度的影響較大;閥芯與閥座間的碰撞使閥芯的振動頻率提高。
[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.
【作者單位】： 清華大學汽車工程系;
【基金】：國家973項目
【分類號】：TH137.52
，
本文編號：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.
【作者單位】： 清華大學汽車工程系;
【基金】：國家973項目
【分類號】：TH137.52
，
本文編號：2136855
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