民用液压舵机动刚度仿真与分析

Simulation and Analysis of Hydraulic Actuator Dynamic Stiffness of Civil Aircraft

动刚度是舵机的一项重要性能指标,必须满足飞机操纵面颤振抑制要求,对飞机安全有着重大意义。舵面颤振总是发生在特定的频率,提高舵机在该频率下的动刚度特性,以保证民机的抗舵面颤振飞行安全。通过对民用液压舵机系统建模,给其施加不同频率的正弦外干扰力,仿真得到不同频率下的舵机系统输出位移,计算得出舵机动刚度特性,分析不同频率下民用液压舵机动刚度变化规律。仿真分析结果表明,民用舵机动刚度特性满足舵面颤振抑制要求,保证民机飞行安全。研究民用液压舵机动刚度特性,掌握舵机动刚度变化规律,填补国内民用液压舵机动刚度研究领域空白,对民机工程有重要指导意义。

Dynamic stiffness is an important performance for hydraulic actuator. It should satisfy the surtace tlutter suppression requirement. Hydraulic actuator dynamic stiffness is significant for aircraft flight safety. Surface flutter often occurs at a particular frequency. The dynamic stiffness of hydraulic actuator should be optimized at such frequency to ensure the aircraft flutter flight safety. By establishing the hydraulic actuator system model of civil aircraft and applying a sinusoidal external load with different frequency, to simulate and record the output displacement of hydraulic actuator, we can calculate the hydraulic actuator dynamic stiffness and analyze the dynamic stiffness changing laws of hydraulic actuator. The simulation and analysis result show that the hydraulic actuator dynamic stiffness satisfies the surface flutter suppression requirement. Hydraulic actuator can ensure the civil aircraft flight safety. It is significative for actual Civil Aircraft Project by researching on hydraulic actuator dynamic stiffness of civil aircraft and mastering the change order of dynamic stiffness. This research fills in the blank of internal civil aircraft hydraulic actuator dynamic stiffness study field.