A High-Order Load Model and the Control Algorithm for an Aerospace Electro-Hydraulic Actuator

It is difficult to describe precisely, and thus control satisfactorily, the dynamics of an electro-hydraulic actuator to drive a high thrust liquid launcher engine, whose structural resonant frequency is usually low due to its heavy inertia and complicated mass distribution, let alone one to drive a...

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Main Authors: Shoujun Zhao, Keqin Chen, Xiaosha Zhang, Yingxin Zhao, Guanghui Jing, Chuanwei Yin, Xue Xiao
Format: Article
Language:English
Published: MDPI AG 2021-03-01
Series:Actuators
Subjects:
Online Access:https://www.mdpi.com/2076-0825/10/3/53
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spelling doaj-e289ae86fc4948a1a458b7e5fe3104fc2021-03-08T00:02:52ZengMDPI AGActuators2076-08252021-03-0110535310.3390/act10030053A High-Order Load Model and the Control Algorithm for an Aerospace Electro-Hydraulic ActuatorShoujun Zhao0Keqin Chen1Xiaosha Zhang2Yingxin Zhao3Guanghui Jing4Chuanwei Yin5Xue Xiao6Laboratory of Aerospace Servo Actuation and Transmission, China Aerospace Science and Technology Corporation, No.1 South DaHongMen Road, Fengtai District, Beijing 100076, ChinaLaboratory of Aerospace Servo Actuation and Transmission, China Aerospace Science and Technology Corporation, No.1 South DaHongMen Road, Fengtai District, Beijing 100076, ChinaLaboratory of Aerospace Servo Actuation and Transmission, China Aerospace Science and Technology Corporation, No.1 South DaHongMen Road, Fengtai District, Beijing 100076, ChinaLaboratory of Aerospace Servo Actuation and Transmission, China Aerospace Science and Technology Corporation, No.1 South DaHongMen Road, Fengtai District, Beijing 100076, ChinaLaboratory of Aerospace Servo Actuation and Transmission, China Aerospace Science and Technology Corporation, No.1 South DaHongMen Road, Fengtai District, Beijing 100076, ChinaLaboratory of Aerospace Servo Actuation and Transmission, China Aerospace Science and Technology Corporation, No.1 South DaHongMen Road, Fengtai District, Beijing 100076, ChinaLaboratory of Aerospace Servo Actuation and Transmission, China Aerospace Science and Technology Corporation, No.1 South DaHongMen Road, Fengtai District, Beijing 100076, ChinaIt is difficult to describe precisely, and thus control satisfactorily, the dynamics of an electro-hydraulic actuator to drive a high thrust liquid launcher engine, whose structural resonant frequency is usually low due to its heavy inertia and complicated mass distribution, let alone one to drive a heavy kerolox engine with high-order dynamics. By transforming classic control block diagrams, a baseline two-mass-two-spring load model and a normalized actuator-engine system model were developed for understanding the basic physics and methodology, where a fourth-order transfer function is used to model the multi-resonance-frequency engine body outside of the rod position loop, another fourth-order transfer function with two pairs of conjugated zeros and poles to represent the composite hydro-mechanical resonance effect in the closed rod position loop. A sixth-order model was thereafter proposed for even higher dynamics. The model parameters were identified and optimized by a full factor search approach. To meet the stringent specification of static and dynamic performances, it was demonstrated that a notch filter network combined with other controllers is needed since the traditional dynamic pressure feedback (DPF) is difficult to handle the high-order dynamics. The approach has been validated by simulation, experiments and successful flights. The models, analysis, data and insights were elaborated.https://www.mdpi.com/2076-0825/10/3/53control modelcontrol algorithmhigh-orderelectro-hydraulic actuator
collection DOAJ
language English
format Article
sources DOAJ
author Shoujun Zhao
Keqin Chen
Xiaosha Zhang
Yingxin Zhao
Guanghui Jing
Chuanwei Yin
Xue Xiao
spellingShingle Shoujun Zhao
Keqin Chen
Xiaosha Zhang
Yingxin Zhao
Guanghui Jing
Chuanwei Yin
Xue Xiao
A High-Order Load Model and the Control Algorithm for an Aerospace Electro-Hydraulic Actuator
Actuators
control model
control algorithm
high-order
electro-hydraulic actuator
author_facet Shoujun Zhao
Keqin Chen
Xiaosha Zhang
Yingxin Zhao
Guanghui Jing
Chuanwei Yin
Xue Xiao
author_sort Shoujun Zhao
title A High-Order Load Model and the Control Algorithm for an Aerospace Electro-Hydraulic Actuator
title_short A High-Order Load Model and the Control Algorithm for an Aerospace Electro-Hydraulic Actuator
title_full A High-Order Load Model and the Control Algorithm for an Aerospace Electro-Hydraulic Actuator
title_fullStr A High-Order Load Model and the Control Algorithm for an Aerospace Electro-Hydraulic Actuator
title_full_unstemmed A High-Order Load Model and the Control Algorithm for an Aerospace Electro-Hydraulic Actuator
title_sort high-order load model and the control algorithm for an aerospace electro-hydraulic actuator
publisher MDPI AG
series Actuators
issn 2076-0825
publishDate 2021-03-01
description It is difficult to describe precisely, and thus control satisfactorily, the dynamics of an electro-hydraulic actuator to drive a high thrust liquid launcher engine, whose structural resonant frequency is usually low due to its heavy inertia and complicated mass distribution, let alone one to drive a heavy kerolox engine with high-order dynamics. By transforming classic control block diagrams, a baseline two-mass-two-spring load model and a normalized actuator-engine system model were developed for understanding the basic physics and methodology, where a fourth-order transfer function is used to model the multi-resonance-frequency engine body outside of the rod position loop, another fourth-order transfer function with two pairs of conjugated zeros and poles to represent the composite hydro-mechanical resonance effect in the closed rod position loop. A sixth-order model was thereafter proposed for even higher dynamics. The model parameters were identified and optimized by a full factor search approach. To meet the stringent specification of static and dynamic performances, it was demonstrated that a notch filter network combined with other controllers is needed since the traditional dynamic pressure feedback (DPF) is difficult to handle the high-order dynamics. The approach has been validated by simulation, experiments and successful flights. The models, analysis, data and insights were elaborated.
topic control model
control algorithm
high-order
electro-hydraulic actuator
url https://www.mdpi.com/2076-0825/10/3/53
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