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三、滚筒的容积式速度伺服系统(续)(四)系统品质分析当K=15 1/sec时,切割频率ω_c=K=15rad/sec,闭环频宽ω_b≈ω_c,显然快速性不成问题。为判断系统稳定性,作系统波德图5-54。由图可见当K=15时,临界稳定;当K=10时系统稳定,幅值贮备L(ω_L)=-5.6db,相角贮备γ(ω_c)=80°由于系统具有积分特性,理论上对于阶跃输入作用,速度误差为零。但测速机本身有0.2％检测误差,因此产生的速度
System Quality Analysis When K = 15 1 / sec, the cutting frequency ω_c = K = 15rad / sec, closed-loop bandwidth ω_b ≈ ω_c, it is clear that the rapidity is not a problem. To determine the stability of the system, make the system Porter Figure 5-54. It can be seen from the figure that the critical stability is obtained when K = 15, the system is stable when K = 10, the amplitude reserve L (ω_L) = -5.6db and the phase angle reserve γ (ω_c) = 80 °. Since the system has the integral characteristic, theoretically For step input, the speed error is zero. But the tachometer itself has a 0.2% detection error and therefore the resulting speed