Abstract
Performance seeking control benefits propfan engine by generating optimal performance in different flight status. It is based on engine model, control model and optimization model. The control scheme of propfan engine is different from those of turbofan engines, for the thrust of propfan engines is mainly produced by propfans. After analysing the control structure of propfan engines, a control scheme for the propfan engine is proposed. The control scheme works well in flight envelope and the simulation results show that the overshoot of power shaft rotation speed is less than 2 % and the settling time is less than 0.9s. Based on this, a control scheme in performance seeking mode is proposed. A Modified Cuckoo Search method, which modifies the search step size and abandonment rate, is applied in the control scheme in maximum thrust mode and minimum fuel flow mode. The control scheme in performance seeking mode can reduce 2 % fuel flow, compared with the control scheme in torque-compensation mode. Performance of the scheme is better than standard Cuckoo Search and Genetic Algorithm.
Funding statement: The authors gratefully acknowledge the financial support from the National Nature Science Foundation of China (No.51576097).
Abbreviations
- CS
Cuckoo Search
- EEC
Electronic Engine Controller
- FCU
Fuel Control Unit
- GA
Genetic Algorithm
- MCS
Modified Cuckoo Search
- PCM
Pitch Change Mechanism
- PSC
Performance Seeking Control
- SFC
Specific Fuel Consumption
- sfc
specific fuel consumption of propfan engine
Nomenclature
power coefficient
dimension of CS solution
rotation speed of high pressure shaft (rpm)
rotation speed of low pressure shaft (rpm)
rotation speed of power shaft (rpm)
host nests number
egg abandonment rate
torque of front propfan (
torque of apt propfan (
turbine inlet temperature (K)
generation number
control variables
fuel flow
state parameters
solution at the
thrust (N)
quality/fitness
step size of CS
pitch angle (°)
front pitch angle (°)
apt pitch angle (°)
coefficient of penalty function
- Subscripts
- best
the best current solution
- d
demand value
- max
maximum
- min
minimum
- 1
front propfan
- 2
apt propfan
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