KSU-A INTREGRATED FLIGHT CONTROL SYSTEM FOR THE ANSAT HELICOPTER
The digital redundant integrated flight control system is developed for the Ansat helicopter equipping, replaces the mechanical control linkage by electrical (fly-by-wire) one and provides:
• required characteristics of stability and controllability on all flight stages – from taking-off to landing - in compliance with AP-29 requirements;
• automatic stabilization of helicopter attitude, speed and flight altitude;
• flying safety in case of possible system failures;
• automatic in-flight and ground monitoring of the KSU-A equipment technical status with operator pilot warning to ensure helicopter control safety and ground maintenance.
The KSU-A is a four- channel (pitch, roll, heading, altitude) electrical digital integrated system for manual and automatic flight control. The linkage of each control lever (cyclic-pitch lever, pedals, collective-pitch lever) involves a quadruple redundant position sensor. Deflection signal from this sensor is transmitted to a quadruple redundant digital computer where control algorithms for electrohydraulic actuators deflecting helicopter control surfaces are realized. The electrical part of the actuators is designed as a quadruple redundant scheme and the hydraulic part – as a duplicate redundant one.4 integral sensor units are used for receiving information about angular rate and acceleration. Information sources of helicopter altitude, flight speed and attitude by roll, pitch and heading are air data system, radio altimeter, barometric altimeter, attitude indicator and compass system being not part of helicopter on-board equipment. The KSU-A computer unit has 4 analog reserves in addition to four digital ones what ensures high system reliability.
Specifications
Mass of the KSU-A, kg no more than 35
Power consumed from airborne power supply channels with voltage of 27 V DC subject to consumed power of 4 redundant electrohydraulic
actuators at steady regime, W no more than 700
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