Classical Methods Based Damage-mitigating Control Law Analysis And Synthesis For Liquid-propellant Rocket Engines

Paper number

IAC-07-C4.I.07

Author

Dr. Jianjun Wu, National University of Defense Technology, China

Coauthor

Year

2007

Abstract

The goal of damage-mitigating and life-extending control (DMLEC) for the liquid propellant rocket engine (LRE) is to achieve a desired trade-off level between structural durability of critical components and dynamic performance of LRE system. This paper presents a viewpoint that analysis and synthesis procedure of DMLEC law for the LRE is based on the multi-objective optimal theory and method. It focuses on the classical methods and procedures of DMLEC law analysis and synthesis, such as the main goal method and the linear weighted sum method. It accounts the turbine blade for a critical component to simulate the above two methods for a certain kind of LRE. What is more, it gives advantages and disadvantages of these methods by discussing the results.
This paper presents that the theoretic base of analyzing and synthesizing the damage mitigating and life extending control law is the multi-objective optimization. It clarifies the methodologies and procedures of the main objective method and the linear weighted sum method for solving the DMLEC law of the LRE. Finally, the simulations of these two methods are implemented for a certain kind of LRE, where the turbine blade is considered a critical component. The results indicate that the two methods applied to analyze and synthesize the DMLEC law is effective, and that they can realize the varying desired level of the tradeoff between the system dynamic performance and the damage of the critical components in practice. The results provide the valuable references to design the controller with damage-mitigating and life-extending for the complex mechanical systems such as aircraft, spacecraft and energy conversion systems. However, with development of intelligent control technology and smart materials, the intelligent automatic control system will be a potential trend of the DMLEC technology in future.
This paper is organized into seven sections including the introduction. In section 2, a methodology of DMLEC is presented. It is outlined that dynamics of a certain kind of LRE, the turbine blade structural and damage dynamics in section 3. Section 4 and section 5 are the important parts of the paper, the former clarifies the DMLEC law optimal problem. In the latter, the two classical methods and procedures of DMLEC law analysis and synthesis are described in detail, respectively. Computer simulation results and discussion are presented in section 6, and summary of the research and conclusions are given in section 7.

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