Design method for optimizing aeroengine transition state control law

Abstract

The invention belongs to the field of aeroengine transition state optimization and control, and discloses a design method for optimizing an aeroengine transition state control law. The SQP algorithm is adopted for optimizing the transition state of an engine, and the transition state control law design under the constraint boundary condition is realized. At the same time, the fuel flow rate valueis adjusted, other constraint conditions are unchanged, and transition state control laws under different constraints are designed. By constructing a transition state time evaluation function, transition state time under each transition state control law is calculated. A lookuptable interpolation table is established through the calculated transition state time and the corresponding fuel flow to realize fuel flow scheduling under different transition state times. The fuel flow obtained by scheduling at the desired time is taken as the acceleration and deceleration plan of closed-loop control of the engine, output is used as a reference instruction of the acceleration process, combination of engine transition state optimization and closed-loop control is achieved, and a theoretical basis isprovided for closed-loop control of the engine.

Description

technical field [0001] The invention relates to a design method for optimizing the transition state control law of an aero-engine, and belongs to the technical field of aero-engine transition state optimization and control. Background technique [0002] The background of the invention is to optimize the transition state control law of a nonlinear component-level mathematical model of a certain type of small bypass ratio turbofan engine. Generally speaking, in engine control, it mainly includes steady-state control and transition-state control. Steady-state control is to ensure that the performance of the engine will not fluctuate when it is disturbed at a certain steady-state point, so that it can return to a steady state. It is a small deviation control problem. In the transition state control of the engine, part or all of the performance of the engine changes with time. The so-called acceleration and deceleration performance is the main form of performance of the transiti...

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Problems solved by technology

[0003] In the transition state of the engine, the acceleration and deceleration plan is set based on the experience of shifting the steady-state working line up and down without exceeding some limit boundaries such as the oversurge plan and the lean flameout line, which leads to the design of the acceleration and deceleration plan in To a certain extent, there is a large margin, so that the transition state performance of the engine cannot be fully utilized

According to the existing literature, there is a power extraction method for the optimization of the engine transition state, but this method cannot consider the volume effect of engine components; in addition, there is a dynamic stability method, but this method needs to know many coupling factors in advance, and the design is very difficult. convenient

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