Aero-engine Compressor Pressure Simulation Method Based on Multi-mode Acceleration and Backstepping Sliding Mode

doi:10.12382/bgxb.2023.0354

Abstract

Abstract:

In the aero-engine hardware-in-the-loop simulation test, the compressor outlet pressure simulation is an important part. In order to simulate the sudden change of airflow in the process of compressor destabilization, a high-precision pressure simulation system is designed, through which a real pressure signal is generated to provide an accurate pressure excitation for the full authority digital engine control. A multi-mode acceleration switching strategy is proposed according to the characteristics of the switching valve, and the acceleration drive waveform and generation method are designed to combine with the field-programmable gate array module to accurately output the acceleration waveform and improve the opening and closing speeds of switching valve. A seven-mode switching method is designed based on the traditional three-mode and five-mode switching methods. The backstepping sliding mode controller is combined with the seven-mode switching method to improve the control accuracy, and the stability of control system is proven. The test results show that the maximum average overshoot in the steady-state pressure test is 1.25%, and the maximum average steady-state error is 0.016MPa. The average errors in the random step response and sinusoidal tracking tests are less than 0.02MPa. The proposed pressure simulation method can meet the requirements for high-accuracy pressure simulation of aero-engine hardware-in-the-loop simulation tests and achieve the accurate pressure simulation at a low cost.

Key words: compressor, pressure simulation, hardware-in-the-loop simulation, switching valve, backstepping sliding mode control

CLC Number:

V233.7

LIN Zhonglin, WANG Haitao, LIU Wenchao, GAN Jinyu, ZHANG Tianhong, HUANG Feng. Aero-engine Compressor Pressure Simulation Method Based on Multi-mode Acceleration and Backstepping Sliding Mode[J]. Acta Armamentarii, 2024, 45(6): 1776-1786.

Figures/Tables 15

Fig.1 Schematic diagram of pneumatic pressure simulation system

Fig.2 Response characteristics of valve under the action of 24V conventional PWM drive waveform

Fig.3 Response characteristics of valve under the action of dual-voltage acceleration waveform

Fig.4 Accelerated waveform generation

Fig.5 Accelerated circuit board

Fig.6 Open-loop charging comparison test

Table 1 Specific forms of seven-mode

模式	效果	充气阀状态	放气阀状态
1	快速充气	不加速开启	关闭
2	慢速充气	加速开启	关闭
3	细微充气	加速开启	加速开启
4	停止	关闭	关闭
5	细微放气	加速开启	加速开启
6	慢速放气	关闭	加速开启
7	快速放气	关闭	不加速开启

Fig.7 Seven-mode switching strategy

Fig.8 Block diagram of pneumatic control system

Fig.9 Pressure simulation platform

Fig.10 Design of software architecture

Table 2 Steady-state pressure tracking tests

组别/MPa	平均超调量/ %	平均调整时间/ s	平均稳态误差/ MPa
0.1~0.2	1.25	0.523	0.016
0.1~0.3	1.02	1.034	0.013
0.1~0.4	0.55	1.502	0.009
0.1~0.5	0.45	2.049	0.008
0.1~0.6	0.52	2.326	0.010

Fig.11 Results of steady-state pressure tracking test

Fig.12 Results of random step signal tracking test

Fig.13 Results of sine signal tracking comparison tests

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