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基于弹簧振子的扰动响应特性,提出了气动阀门气固耦合自激振动的稳定性机理.以单向阀为例,根据小扰动原理,构建系统的气固耦合动力学模型及稳定性模型,通过求解线性方程组的特征根,得到了单向阀系统的稳定工作区间及参数影响特性,稳定性分析模型的有效性由单向阀气动试验验证.对于单向阀,存在压力-流量的临界稳定性曲线.工作压力一定时,当单向阀工作流量小于相应压力下的临界稳定流量,单向阀处于不稳定状态,一个微小的扰动都将会导致阀芯周期性振荡;反之,单向阀工作稳定,阀芯将处于稳定开度.增加单向阀阀芯阻尼、弹簧刚度及减小阀门进口直径在一定程度上将有助于提高单向阀的工作稳定性.
Based on the perturbation response characteristics of the spring vibrator, the stability mechanism of the self-excited vibration of the pneumatic valve is put forward. Taking the one-way valve as an example, according to the principle of small disturbance, the dynamic model and the stability model of the system are established, The eigenvalues of the system of linear equations are solved, and the stable operating range of the one-way valve system and the parameter influencing characteristics are obtained. The effectiveness of the stability analysis model is verified by the one-way valve aerodynamic test. For the one-way valve, there is a critical pressure- When the working pressure is constant, when the working flow of the check valve is less than the critical steady flow under the corresponding pressure, the check valve is in an unstable state and a slight disturbance will cause the valve core to periodically oscillate. On the other hand, the check valve Work stability, the spool will be in a stable opening.Improvement of one-way valve spool damping, spring stiffness and reduce the valve inlet diameter to a certain extent, will help improve the working stability of the one-way valve.