Ablation Material Aerial Vehicle Control Parameter Adjustment
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Solution Overview
Problem
Aerial vehicles face challenges in maintaining control parameters due to changes in aerodynamic characteristics caused by the disappearance of ablation materials used for high aerodynamic heating resistance, leading to potential deterioration of control characteristics.
Innovation Solution
An aerial vehicle with an outer surface composed of ablation material, equipped with an arithmetic unit and control unit that calculates and adjusts control parameters based on the amount of shape change caused by the disappearance of the ablation material, allowing for real-time adaptation of attitude and thrust control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If ablation material is used for the outer surface to resist aerodynamic heating, then heat resistance is improved, but aerodynamic characteristics change as the material disappears
Solution Approach 1:
The control parameter is dynamically adjusted based on the amount of shape change of the aerial vehicle. The arithmetic unit detects shape changes caused by ablation material disappearance and modifies control parameters in real-time, transforming the static control system into a dynamic one that adapts to changing aerodynamic characteristics.
Solution Approach 2:
The control parameter is changed in response to the amount of shape change of the aerial vehicle. This parameter change approach allows the control system to compensate for aerodynamic characteristic variations caused by ablation material consumption, maintaining stable control performance throughout the flight.
2Object-affected harmful factors
If heat resisting alloy is used for the outer surface to resist aerodynamic heating, then heat resistance is improved, but weight increases
Solution Approach 1:
The outer surface uses ablation material instead of heat resisting alloy. Ablation materials typically have lower density than heat resisting alloys while providing adequate heat protection through the ablation process, thus reducing the weight of the aerial vehicle while maintaining heat resistance.
Solution Approach 2:
The ablation material utilizes phase transitions (melting, vaporization) to absorb and dissipate aerodynamic heating energy. This phase change mechanism provides effective heat protection without requiring the high density and weight of heat resisting alloys.
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 enables the aerial vehicle to effectively manage changes in aerodynamic characteristics, thereby suppressing the deterioration of control characteristics and ensuring stable operation even as the ablation material wears or melts.
Implementation Method 1
a technology using ablation material for the surfaces of the aerial vehicle 1 is known (FIG. 2). Thereby, heat input from the environment to the aerial vehicle 1 is reduced as a result of melt of the ablation material.
Implementation Method 2
the aerial vehicle tends to be exposed to an environment of high aerodynamic heating as the speed of the aerial vehicle increases or the flying range of the aerial vehicle increases.
Data Source
AI summary
An aerial vehicle includes an outer surface, an arithmetic unit and a control unit. The arithmetic unit calculates a control command using a control parameter. The control unit controls an attitude of the aerial vehicle or a thrust of the aerial vehicle based on the control command. At least a part of the outer surface of the aerial vehicle is composed of ablation material. The arithmetic unit changes the control parameter in response to an amount of shape change of the aerial vehicle caused by disappearance of the ablation material.