基于电传飞控的直升机扭振试验总距激励技术

Research on Collective Pitch Excitation Technology of Helicopter Torsional Vibration Test based on Fly-by-wire Flight Control System

直升机传动链扭振试验是为了获得扭振低阶固有频率,从而修正凹陷滤波器中心频率,保证传动链扭振与发动机燃调控制系统耦合的稳定性。介绍了一种基于电传飞控的总距激励技术;为保证系统激振幅值稳定,提出并应用了幅值闭环控制策略,且进行了仿真分析验证其有效性;然后以CRIO作为系统架构,在Labview软件开发平台上,通过软件算法实现液压激振伺服控制策略,保证了激振频率的精度。在某新型直升机的地面试验中进行了实际应用验证,符合设计技术要求,满足试验需求。

The torsional vibration test of helicopter drive chain is to obtain the low-order natural frequency of torsional vibration,so as to correct the center frequency of the notch filter and ensure the coupling stability between torsional vibration of drive chain and engine combustion control system.This paper introduced a research on collective pitch excitation technology of helicopter torsional vibration test based on fly-by-wire flight control system.In order to ensure the stability of excitation amplitude,the amplitude closed-loop control strategy was proposed and applied,and its effectiveness was verified by model simulation analysis.Then,adopting CRIO architecture as system architecture,on the LABVIEW software development platform,the hydraulic excitation servo control strategy was realized through software algorithm to ensure the accuracy of excitation frequency.It had been verified by practical application in the ground test of a new helicopter,which met the design technical requirements and the test requirements.