Helicopter Rotor Multi-coordinated Loading The Computer Control System

To a helicopter, one of the key technologies is how to control the airscrew. So it is very important to simulate aerodynamic loads acting on the helicopter's airscrew when the helicopter is flying in the air. It affords datum, which are contributed to the use of new flight vehicle. A distributed computer control system which is used in an helicopter airscrew multi-channel harmony loading test project is introduced in this paper. The paper analyses the construct and the model of the system. The technical noduses of the harmony loading system, such as multi-channel signal synchroniza -tion, signal phase modulating and frequency excursion control are discussed. The key steps and actualization details are also provided.First, a global review on the helicopter airscrew multi-channel harmony loading control system is introduced. Then on the basis of its working principle, a mathematical model of the system is constructed.Redundant force, which is produced through position disturbance, is the most important problem facing aerodynamic loading system. So how to minish the redundant force by selecting proper control strategy is a main aspect discussed in this paper. By applying the structure invariant theory in the control strategy, the feedforward-feedback control theory is applied in the control system design to reduce the redundant force. Related simulations are illustrated in Matlab and the results were satisfactory.Finally, the realization of the hole system is discussed, include the hardware and software. The digital signal processing and the technology of phase harmony are also provided. Problems appearing at work and tackling methods are both presented.Recently, the research result has been applied to the helicopter airscrew harmony loading test. The results of harmony loading test show that it has high performance.