四、伺服阀的最佳设计(续)2.伺服阀最佳设计步骤根据前边推导结果可按下述步骤开始伺服阀的最佳设计。(1)已给条件伺服阀空载流量Q_M,升/分;能源压力P_s,公斤力/厘米~2;频宽f_(-3ab),或f_(-90°),赫;阶跃过渡函数的超调量σ_M,％;阶跃过渡函数的振荡次数μ_M,次; 阶跃过渡函数的过渡时间τ_M,秒;幅频正峰值L_(M0),分贝。(2)确定ξ及k值由图3-6看出σ、μ、L_M皆随ξ减小而增大,故可从图3-6中找出满足下列不等式的ξ最小值 IV. THE BEST DESIGN OF SERVO VALVE (Cont.) 2. Optimal Design Procedure of Servo Valve The optimal design of servo valve can be started according to the preceding results according to the following steps. (1) Conditioned servo valve no-load flow rate Q_M, L / min; Energy pressure P_s, kgf / cm ~ 2; Bandwidth f_ (-3ab), f_ (- 90 °) Of the overshoot, σ_M,%; the number of oscillations of the step transition function μ_M, times; the transition time of the step transition function τ_M, second; the amplitude-frequency peak L_ (M0), dB. (2) Determine the ξ and k values ​​From Figure 3-6, we can see that σ, μ and L_M all increase with the decrease of ξ, so we can find the minimum value of ξ that satisfies the following inequalities