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Keywords = variable-thrust solid-propellant rocket motor

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17 pages, 7678 KB  
Article
Flexible Three-Dimensional Stress Sensor for Embedded Monitoring of Solid Rocket Propellant
by Yaoguang Shi, Xiaozhou Lü, Kai Ren and Wensong Zhu
Micromachines 2026, 17(1), 57; https://doi.org/10.3390/mi17010057 - 30 Dec 2025
Viewed by 318
Abstract
Solid rocket motors (SRMs) play a pivotal role in space exploration owing to their reliability and high thrust-to-weight ratios. SRM propellant health monitoring is in critical demand owing to the complex operational scenarios throughout the entire life cycle of SRMs. To achieve in [...] Read more.
Solid rocket motors (SRMs) play a pivotal role in space exploration owing to their reliability and high thrust-to-weight ratios. SRM propellant health monitoring is in critical demand owing to the complex operational scenarios throughout the entire life cycle of SRMs. To achieve in situ detection of three-dimensional stress, this study introduces a novel flexible three-dimensional stress sensor (FSS). First, a liquid metal pressure-sensing element with a variable cross-section was designed and numerically modeled. The performance of the FSS under different loading conditions was analyzed using finite element modeling. The sensing element prototype was fabricated using mold casting and liquid metal injection methods. The fabricated sensing-element prototype with an area ratio of 1:5 exhibited a sensitivity coefficient of 1.5%/kPa at a pressure of 300 kPa, a maximum hysteresis error of 3.98%, and a stability error of 0.17%. Finally, the FSS was developed by integrating multiple pressure-sensing elements and encapsulating the force-concentrating layers. The fabricated FSS prototype was characterized using simulated propellant experiments. Via comparison with the simulation results, the FSS was found to detect multiaxial stress differences when embedded within a propellant. Full article
(This article belongs to the Special Issue Flexible Intelligent Sensors: Design, Fabrication and Applications)
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18 pages, 2160 KB  
Article
Performance Comparison of Control Strategies for a Variable-Thrust Solid-Propellant Rocket Motor
by Jihyoung Cha and Élcio Jeronimo de Oliveira
Aerospace 2022, 9(6), 325; https://doi.org/10.3390/aerospace9060325 - 16 Jun 2022
Cited by 14 | Viewed by 7800
Abstract
This paper deals with a performance comparison of the control algorithm for a variable-thrust solid-propellant rocket motor (VTSRM). To do this, we develop a simulation model of a VTSRM considering characteristic changes in the combustor and design control systems for pressure and thrust. [...] Read more.
This paper deals with a performance comparison of the control algorithm for a variable-thrust solid-propellant rocket motor (VTSRM). To do this, we develop a simulation model of a VTSRM considering characteristic changes in the combustor and design control systems for pressure and thrust. We use three types of control algorithms for the pressure control: classical PID control, feedback linearization control, and fuzzy PID control, and two control algorithms for thrust control: classical PID control and fuzzy PID control. Finally, we compare the performance of each control system through a numerical simulation using step responses. Through this work, we check that feedback linearization is better in pressure control, and fuzzy PID control is more appropriate in thrust control. Especially using fuzzy PID control, we can get fast settling with a small undershoot even if the system is a nonminimum phase system. Full article
(This article belongs to the Collection Space Systems Dynamics)
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