Nozzle Opening Correction for Combustion Pressure Stability
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Solution Overview
Problem
Existing orbit attitude control systems for flying objects face challenges in maintaining a constant combustion chamber pressure due to mechanical errors, thermal expansion, and fuel uniformity issues, leading to unstable combustion and attitude control.
Innovation Solution
A control system that calculates and applies nozzle opening degree correction values based on detected combustion chamber pressure and command values to maintain constant pressure, using a plurality of nozzles with controlled opening degrees and a control section to adjust the opening degrees of pintle valves in the divert thruster.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the opening degree of the valve is controlled to keep the combustion chamber pressure constant, then stable combustion is achieved, but unpredictable pressure changes occur due to mechanical errors, thermal expansion, and fuel ununiformity
Solution Approach 1:
The patent implements a feedback control mechanism where the actual combustion chamber pressure is continuously measured and compared with the target pressure. Based on the pressure difference, correction values are calculated and applied to adjust the valve opening degrees, enabling dynamic compensation for disturbances and maintaining stable combustion despite mechanical errors, thermal expansion, and fuel ununiformity.
Solution Approach 2:
The patent replaces pure mechanical pressure control with a control system that uses pressure sensors and computational algorithms. Instead of relying solely on mechanical valve positioning, the system uses electronic feedback control to calculate and apply opening degree corrections, substituting mechanical precision requirements with sensor-based measurement and computational compensation.
2Measurement precision
If multiple nozzles are used for orbit attitude control, then control precision is improved, but the complexity of controlling each nozzle's opening degree increases
Solution Approach 1:
The patent combines the control of multiple nozzles under a unified feedback control framework. Instead of independently controlling each nozzle, the system integrates pressure feedback from the combustion chamber and calculates coordinated opening degree corrections for all nozzles simultaneously, reducing control complexity while maintaining precision through collective adjustment.
Solution Approach 2:
The patent creates a universal control algorithm that handles multiple nozzles with a single pressure feedback loop. The same control logic and correction calculation method is applied to all nozzles, making the control system multi-functional and adaptable to different nozzle configurations without requiring separate control mechanisms for each nozzle.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution ensures stable combustion and precise control of the flying object's orbit attitude by maintaining constant combustion chamber pressure, reducing the impact of disrupting factors and ensuring consistent thrust forces.
Implementation Method 1
A combustion gas is supplied to a plurality of nozzles included in a thruster from a common combustion chamber
Implementation Method 2
Each nozzle injects the combustion gas with an amount corresponding to the opening degree, and thereby an orbit attitude of the flying object is controlled
Data Source
AI summary
An orbit attitude control device includes a plurality of nozzles and a control section. The nozzles inject a combustion gas supplied from a combustion chamber, opening degrees being controlled in accordance with opening degree command values. The control section calculates nozzle opening degree correction values for the opening degree command values in response to a detection value of a pressure of the combustion chamber and a command value for the pressure, and correct the opening degree command values by the nozzle opening degree correction values. Each nozzle opening degree correction value is determined based on each opening degree command value.