Command Mixing for Roll Stabilized Guidance Kit
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Solution Overview
Problem
Conventional guidance systems for projectiles face challenges in achieving precise roll control and stability, often requiring large canards that reduce gyroscopic stability and increase drag, while also being complex and costly.
Innovation Solution
A command mixing system using a guidance kit with a first and second canard connected to control horns on a drive bar, actuated by a link shaft and actuators, allowing simultaneous pitch and roll control through coordinated canard deflections, reducing the need for roll canards and enhancing gyroscopic stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If four canards are used for roll control and pitch control, then roll control precision is improved, but gyroscopic stability is reduced and device complexity increases
Solution Approach 1:
The patent merges roll control and pitch control functions into a single canard structure with differential deflection capability. The canard can be deflected at different angles to simultaneously generate both rolling and pitching moments, eliminating the need for separate roll canards and reducing overall device complexity while maintaining control precision.
Solution Approach 2:
The canard is designed to perform multiple functions: it provides both roll control and pitch control capabilities through differential deflection. By making the canard multi-functional, the patent reduces the total number of control surfaces needed while maintaining full control authority in both roll and pitch axes.
2Measurement precision
If four canards are used for roll control and pitch control, then roll control precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent merges roll control and pitch control functions into a single canard structure with differential deflection capability. The canard can be deflected at different angles to simultaneously generate both rolling and pitching moments, eliminating the need for separate roll canards and reducing overall device complexity while maintaining control precision.
Solution Approach 2:
The canard is designed to perform multiple functions: it provides both roll control and pitch control capabilities through differential deflection. By making the canard multi-functional, the patent reduces the total number of control surfaces needed while maintaining full control authority in both roll and pitch axes.
3Volume of moving object
If forward canards are used to avoid packaging problems, then packaging space is improved, but aerodynamic stability is reduced
Solution Approach 1:
The patent merges roll control and pitch control functions into a single canard structure with differential deflection capability. The canard can be deflected at different angles to simultaneously generate both rolling and pitching moments, eliminating the need for separate roll canards and reducing overall device complexity while maintaining control precision.
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
The system improves gyroscopic stability by up to one percent and reduces drag, allowing for more maneuverability and increased control power with fewer fins, leading to lower complexity, cost, and enhanced range.
Implementation Method 1
the first and second canards deflect in opposite directions to generate an aerodynamic rolling moment
Implementation Method 2
a link shaft being connected via a first end to the drive bar and via a second end to a gimbal; and a first actuator acting on the gimbal via a third control horn and a second actuator acting on the drive bar
Implementation Method 3
Gyroscopically stabilized munitions can be guided by a guidance kit attached at the front of the projectile
Data Source
AI summary
The system and method of mixing pitch and roll commands from a flight control computer to produce fin deflections applied to as few as two fins to simultaneously produce both a rolling moment and a pitching moment. The system may be mechanical or digital where actuators can be linear or rotary, digital or analog. Deflections of the fins are generated which produce pitch and roll moments where addition of pitch and roll commands determines deflection commands to be sent to a first fin and subtraction of pitch and roll commands determines deflection commands to be sent to a second fin.