In order to meet the different tasks or fault conditions and reduce the workload of pilots, the modern fly-by-wire aircraft can adopt different control system, called the multi-mode control systems. Modes switching, due to the change of the system characteristic, may make the aircraft response appear dramatic changes in the transient response that bother pilots. In the flight control systems, the algorithm to suppress the transient responses is called fade-out device. Firstly, some aspects needed to be noticed in design and simulation of the fade-out devices are shown, and the switching model is constructed . Then the simulation results of three common fade-out devices are compared, and a quantitative parameter to assess fade-out devices is put forward, which can assist in selection of fade-out sequence.%对于现代电传操纵系统的飞机,为了满足飞机不同飞机任务或故障下的需要,减轻驾驶员的工作负担,会采用不同的控制系统,称为多模态控制.模态转换时,由于系统特性的改变,可能会使飞机响应在变换前后出现不利的急剧变化的瞬态响应,在飞行控制系统中抑制这些瞬态响应的算法称为淡化器.首先分析淡化器设计影响因素,建立了转换过程仿真模型,提出了淡化器实现模态转换的数学表达式,并使用实例对常见的三种淡化器进行仿真比较,最后提出一个用于选择淡化器的量化指标,可辅助选取淡化序列.
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