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现代轧机广泛采用液压压下代替电动压下。因为它调节辊缝的快速性,为厚度自动控制创造了有利条件。快速性,通常用系统闭环频宽来表示。液压压下频宽约5～20Hz,比电动压下快10倍以上。如果系统各环节都是线性的,一般来说,在稳定的条件下,开环放大系数越大,频宽越大。但实践表明,开环放大系数的选择要受油缸固有频率的限制。主要原因是在系统中,油缸的固有频率往往是最低的,而其它环节可视为是比例环节。油缸固
Modern rolling mill widely used hydraulic pressure instead of electric pressure. Because it adjusts the rapidity of the roll gap, it has created favorable conditions for automatic thickness control. Quickness, usually expressed in terms of system closed-loop bandwidth. Hydraulic pressure bandwidth of about 5 ~ 20Hz, 10 times faster than electric pressure faster. If the system is linear in all aspects, in general, under stable conditions, the larger the open-loop amplification factor, the greater the bandwidth. However, practice shows that the choice of open-loop amplification factor is limited by the natural frequency of the fuel tank. The main reason is that in the system, the natural frequency of the cylinder is often the lowest, while the other links can be regarded as the proportion of links. Cylinder solid