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三、油路的回路分析法——调速阀动态特性分析对于简单的油路,我们可以直接根据阻抗的串联、并联等网络基本定理,用化简油路的方法求解。例如图12(a)所示的四边滑阀控制的油缸,它的油路图如12(b)所示。图中,N_1和N_2代表两腔中油的压缩性;△Pf(s)是外力△F造成的压力源,△Pf(s)=AF(s)/A;G_1和G_2是两个阀口的导流系数;K_(q_1)△X和K_(q_2)△X是相应的阀口受控流量源。图12(a)中的系统压力P_s是一个恒量,因此在图12(b)中不出现(相当于被短路)。当我们要求负载速度△u(s)对外力△F(s)的传递函数W(s)时,可以令△X=0,即除去受控流量源K_c△X。由图12(c),我们立即可以求得
Third, the circuit analysis of the oil - the dynamic characteristics of speed control valve For a simple oil, we can directly according to the impedance of the series, parallel and other network basic theorem, using simplified method of solving the circuit. For example, as shown in Figure 12 (a) shows a four-spool valve control cylinder, the oil circuit shown in Figure 12 (b) below. In the figure, N_1 and N_2 represent the compressibility of the oil in the two chambers; △ Pf (s) is the pressure source caused by the external force ΔF, △ Pf (s) = AF (s) / A; Drainage coefficient; K_ (q_1) △ X and K_ (q_2) △ X is the corresponding valve port controlled flow source. The system pressure P_s in Fig. 12 (a) is a constant and thus does not appear in Fig. 12 (b) (equivalent to being short-circuited). When we call the transfer function W (s) of the load speed △ u (s) against the external force △ F (s), △ X = 0, that is, the controlled flow source K_c △ X can be removed. From Figure 12 (c), we can immediately find