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Simulation of Modal Interval and Fault Detection in Quid Rocket Engine

Author: HuangHuiZuo
Tutor: ZouJingXiang；FanJiuMing
School: Harbin Institute of Technology
Course: General and Fundamental Mechanics
Keywords: Fault detection Envelope Modal Interval Analysis Liquid Rocket Engine Simulation Model
CLC: V434
Type: Master's thesis
Year: 2007
Downloads: 132
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Abstract


Aiming at the fault diagnosis method, model-based fault diagnosis method takes into account the uncertainty diagnostic system parameters , resulting in system simulation results are often inconsistent with the actual behavior of defects , the introduction of modal interval analysis method parameter uncertainty modeling and simulation of dynamic systems and fault detection , better solution to the above problems. Classical interval analysis algorithm for dynamic systems modeling and simulation , the envelope easily dissipate . This paper introduces the modal interval algorithm to solve the problem ; through the heat exchanger system simulation , modal interval analysis method can effectively solve the uncertainty of dynamic systems with real-time simulation questions and get precise interval corresponding envelope line . In this paper on China's existing fleet of a large liquid rocket engine for real-time simulation, the solution of differential equations using the fourth-order variable step Runge-Kutta method ; nonlinear algebraic equations , the use for the modified Newton iterative method to improve the computing speed and convergence speed . Finally, in real-time simulation , based on the mathematical model of liquid rocket engine is modal expansion range model, using Runge - Kutta method , the modified Newton method, a large liquid rocket engine modal interval simulation, its steady-state interval envelope and the envelope with fault detection , the results show that the method for large complex dynamic system is effective. The study for the design and implementation of interval analysis method based on modal liquid rocket engine fault diagnosis and health monitoring system has important theoretical and applied on the reference value.

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CLC: > Aviation, aerospace > Aerospace ( Astronauts ) > Propulsion system ( engine, propeller ) > Liquid propellant rocket engine
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