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A certain type of variable thrust rocket engine control system design

Author: LiHongZeng
Tutor: LuJingChao
School: Northwestern Polytechnical University
Course: Detection technology and automation devices
Keywords: Variable thrust liquid rocket engine PWM SCM Real-time operating system System Modeling Control System Design Semi-physical simulation
CLC: V433
Type: Master's thesis
Year: 2005
Downloads: 181
Quote: 0
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Abstract


This article discusses a certain type of variable thrust liquid rocket engine digital control system design and implementation. First, combined with the characteristics of variable thrust engine designed digital controller hardware circuit . Using MCU PSD structure simplifies hardware design of the controller , reducing the volume , improving reliability ; and designed for high voltage fast switching driver circuit reduces the dead zone of the electromagnetic valve , improve the accuracy of the system control ; secondly the real-time operating system uC / OS-II transplants to 80C196KC microcontroller, control software built on the basis of this system , making the software structure is clear , and easy to further development and maintenance of software . Then try using the system actually cold and hot test test data to establish the mathematical model . The linear part of the system , the application of the mechanism analysis and system identification method modeling ; nonlinear part , the application of equivalent area approach to nonlinear nature of the PWM linearization process , which gives a linear model of the system under different conditions . The simplified system model properly , the system is discussed in the discrete domain dynamic and steady-state performance. Finally the application of matlab in rtwin tools to quickly achieve a semi-physical simulation system , and for the controlled object parameters with characteristic changes in working conditions proposed adaptive control algorithm parameter adjustment , and in the semi-physical simulation has been verified. The controller has passed the water test and fuel testing , the design of the hardware circuit safe and reliable performance , the software is stable . Simulation results show that the established model of the system can more accurately reflect the actual system input and output characteristics , the design of adaptive modulation parameter control law to meet the system performance requirements emanating .

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CLC: > Aviation, aerospace > Aerospace ( Astronauts ) > Propulsion system ( engine, propeller ) > Engine control systems and devices
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