Abstract:

An engineering design and realization of redundant digital servo system for direct drive valve (DDV) actuator is presented. The DDV servo actuator is a new generation of electrohydraulic redundant actuator, which has been used in many advanced aircraft. The redundant digital servo system introduced in this paper has been applied in an advanced training plane, and accomplished its preliminary flight tests. The redundancy level of servo system for DDV actuator and its design concept are described. A simulation model oriented structure parameter of DDV actuator is built,and so does the discrete model of redundant digital servo system.A simulation is carried out to analyze the performances of DDV actuator,including static and dynamic characteristics,sample frequency,and characteristics of monitor.In order to verify the performance of DDV actuator,the redundant digital servo system is tested in a new way—rapid prototyping based on real-time SIMULINK/xPC simulation,the results show that the performance of the presented system is satisfied.

Key words: DDV,  ,  , redundant , actuator,  ,  , digital , servo , system,  ,  , rapid , prototyping