基于时间预测的升力风扇起动过程控制规律设计

To reduce the shaft driven lift fan starting time，a general control law design method was proposed for the shaft driven lift fan propulsion system. A prediction model of the remaining starting time based on trend extrapolation and with a reference to the lift fan speed curve was established. Based on the time prediction model and control law pointwise optimization design method，the starting process control law was optimized point by point，and the starting process control law can be obtained by performing multiple rounds of optimization and using the optimization results of each round to update the reference speed curve. This method was used to design the control law of the starting process with the low-pressure rotor speed at the initial state of 50%. The starting time was only 3.1 s，which was 22.5% shorter than that of the pointwise optimization method， and the starting process strictly met the safe working limit. Furthermore，multiple groups of starting process control laws with the initial speed of 90% and between 50% and 90% were designed，illustrating that this method is not only suitable for starting at low speeds，but also effective at high speeds.