OTV liquid rocket engine control and health monitoring

Bellows, Joelle; Brewster, Rick; Bekir, Esmat

doi:10.2514/6.1984-1286

Cited by 4 publications

(4 citation statements)

References 3 publications

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“…The in-flight control should ensure a simplification of testing and flight preparation, allowing thrust modulation and versatility. In a paper by Bellows et al from the Rocketdyne company [19], the need for a more reliable and coordinated control and health monitoring system for rocket engines is highlighted, already in 1984. A reference is made to SSME engine-mounted programmable control system, which managed redundancy, a severe environment and real-time constraints and offered flexibility.…”

Section: Lpre Control Systems Backgroundmentioning

confidence: 99%

A survey of automatic control methods for liquid-propellant rocket engines

Pérez-Roca

Marzat

Piet-Lahanier

et al. 2019

Progress in Aerospace Sciences

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The main purpose of this survey paper is to review the field of convergence between the liquid-propellant rocketpropulsion and automatic-control disciplines. A comprehensive collection of academic works and some industrial developments are summarised and discussed, making the link to the current context of launcher reusability. The main control problem in liquid-propellant rocket engines (LPRE), the target of this survey, generally consists in tracking set-points in combustion-chamber pressure and mixture ratio, their main operating quantities. This goal is attained via the adjustment of flow-control valves while complying with operating constraints. Each aspect of control systems, ranging from modelling to the actual control techniques, is reviewed and subsequently related to the rest of aspects. The comparison of the different approaches points to the general use of linearised models about concrete operating points for deriving steady-state controllers, which in most cases are of PID type. Other more sophisticated approaches present in the literature, incorporating some nonlinear, hybrid or robust techniques, improve certain aspects of performance and robustness. Nevertheless, no fully nonlinear or hybrid frameworks, which may allow the control of a wider throttling domain, have been published. In addition, control during the thermally and structurally demanding transient phases is usually in open loop, and hence with low correction margins. This sort of control enhancements, probably together with more sophisticated monitoring architectures, would serve to extend the life of LPRE, a significant factor in their reusability. Therefore, this survey intends to draw a path for the future control design trends which will certainly be more suitable for reusable LPRE.

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Section: Lpre Control Systems Backgroundmentioning

confidence: 99%

A survey of automatic control methods for liquid-propellant rocket engines

Pérez-Roca

Marzat

Piet-Lahanier

et al. 2019

Progress in Aerospace Sciences

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“…Solenoid valve hydraulic control technology is heavily utilized in the thrust control system of variable-thrust liquid rocket engines [2,3]. It is feasible to regulate the thrust system of these engines by altering the control valves in the combustion chambers [4,5]. The three main loops that are required for the proper operation of variable-thrust liquid rocket engines are thrust control, propellant usage control, and thrust vector control [6].…”

Section: Introductionmentioning

confidence: 99%

“…These loops and subsystems are in charge of gathering sensor data and changing the controllable inputs to determine the state of the engine and process variables. Based on the aforementioned techniques that use an open loop to achieve thrust control, Pérez-Roca et al, Xin et al, Yun-qin, Bellows et al, Le Gonidec, Huzel and Huang, Timnat, Lorenzo and Musgrave, Sutton and Biblarz, Dai and Ray, and Kiforenko and Kharitonov developed an open-loop optimal control strategy in [1][2][3][4][5][6][7][8][9][10][11] for controlling the thrust of a rocket engine. However, the majority of investigations employ closed-loop control.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Research of Control System Design Based on H-Infinity and ALQR for the Liquid Rocket Engine of Variable Thrust

Chen

Xue²,

Tang

et al. 2023

International Journal of Aerospace Engineering

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The design and analysis procedures for the thrust controller used in variable-thrust rocket engines are substantially different from those used in conventional engines due to the large-scale thrust adjustment capabilities that result in a wide range of operating situations. In this study, two control algorithms, h-infinity and adaptive linear quadratic regulator (ALQR), are constructed, examined, and contrasted utilizing the adaptive control system architecture. Both methods are capable of producing engines that respond in less than one second, have a steady-state error of less than two percent, and are robust.

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“…The complex structures and extreme working environments make LREs the most vulnerable subassemblies and prone to failure [1]. Since the 1960s, with the development of major projects with milestone significance, such as manned moon landings and space shuttles, more attention has been paid to the reliability and security of LREs [2], [3]. Currently, health monitoring technology has become one of the important and effective means to ensure the safe and reliable operation of LREs.…”

Section: Introductionmentioning

confidence: 99%

Steady-State Process Fault Detection for Liquid Rocket Engines Based on Convolutional Auto-Encoder and One-Class Support Vector Machine

Zhu

Cheng

et al. 2020

IEEE Access

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Liquid rocket engines (LREs) are the main propulsive devices of launch vehicles. Due to the complex structures and extreme working environments, LREs are also the components prone to failure. It is of great engineering significance to develop fault detection technologies which can detect fault symptoms in time and provide criteria for further fault diagnosis and control measures to avoid serious consequences during both the ground tests and flight missions. This paper presents a novel fault detection method based on convolutional auto-encoder (CAE) and one-class support vector machine (OCSVM) for the steady-state process of LREs. We train the CAEs by normal ground hot-fire test data of a certain type of large LRE for automatic feature extraction. Then the obtained features are used to train the OCSVMs to accomplish the fault detection task. The results demonstrate that the proposed method outperforms traditional redline system (RS), adaptive threshold algorithm (ATA), and back-propagation neural network (BPNN). We also study the effect of sample sizes and domain knowledge on the performance of the proposed method. The results suggest that appropriate measures that enrich the effective information content in the training data, such as increasing sample size and introducing domain knowledge, can further improve the performance of the proposed fault detection method.

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OTV liquid rocket engine control and health monitoring

Cited by 4 publications

References 3 publications

A survey of automatic control methods for liquid-propellant rocket engines

A survey of automatic control methods for liquid-propellant rocket engines

A Comparative Research of Control System Design Based on H-Infinity and ALQR for the Liquid Rocket Engine of Variable Thrust

Steady-State Process Fault Detection for Liquid Rocket Engines Based on Convolutional Auto-Encoder and One-Class Support Vector Machine

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