Tunnel ventilation process is approximately a system of time lag of first order, real time control of wind pressure in tunnelpipe is adopted self-tuning fuzzy PID.
隧道通风过程可近似认为是一个一阶时滞系统，系统采用自整定模糊pid对隧道管网的风压进行实时控制。
2
The pipe section of the immersed tunnel is the large-volume concrete structure, which is complicated in the structure shape.
沉管隧道工程中的管段为大体积混凝土构件，结构形式较为复杂。
3
Underground tunnel, high pressure bifurcated pipe, water inlet tunnel designing and their lining style need know crustal stress too.