Rotor-Triggered Wire Cutter Retraction for Aircraft Cable Strikes
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Solution Overview
Problem
Air vehicles, such as helicopters, are prone to crashes when hitting obstacles like electrical wires or telephone cables during flight due to the lack of effective wire cutting systems that can minimize damage and maintain aerodynamic integrity.
Innovation Solution
A wire cutter system with a movable actuator mechanism that extends outward from the air vehicle body when rotational speed exceeds a predetermined threshold, retracting inward when the speed is below the threshold, using a sensor and actuator system to manage the position based on rotor speed, and incorporating a pulley and belt system for mechanical activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wire cutter extends outward from the body to cut obstacles, then the cutting effectiveness is improved, but the risk of collision with wings increases
Solution Approach 1:
The wire cutter is designed to be movable between extended and retracted positions relative to the air vehicle body. The actuator system enables dynamic adjustment of the wire cutter's position based on flight conditions, allowing it to extend when needed for cutting and retract when collision risk exists
Solution Approach 2:
The system uses the rotor's own rotational speed as the triggering condition for wire cutter deployment. When rotor speed exceeds a predetermined threshold, the wire cutter automatically extends without requiring external intervention, and retracts when the threshold is not met
2Device complexity
If the wire cutter is fixed in position, then the structure is simpler, but the aerodynamic impact increases
Solution Approach 1:
The wire cutter transitions from a fixed structure to a dynamic one that can change position. By retracting into the body when not in use or at lower speeds, the wire cutter minimizes its aerodynamic footprint and reduces drag and turbulence
Solution Approach 2:
The wire cutter operates in periodic cycles of extension and retraction based on rotor speed thresholds. This periodic action allows the system to maintain simplicity when retracted while providing cutting capability when extended
3Reliability
If the wire cutter extends outward to cut wires, then the cutting capability is improved, but the wing collision risk increases when wings are bent
Solution Approach 1:
The system monitors rotor speed and prepares the wire cutter for extension in advance. By using rotor speed threshold as a predictive indicator, the wire cutter extends proactively when flight conditions suggest wire cutting may be needed, and retracts when conditions indicate potential wing bending and collision risk
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
Enhances flight safety by preventing damage from obstacles and minimizing wing collision risks by automatically adjusting the wire cutter's position based on rotor speed, ensuring minimal aerodynamic impact and effective cutting of wires.
Implementation Method 1
a first position (I) in which the wire cutter (4) is triggered by the rotation of the rotor (3) around its own axis, such that the wire cutter (4) extends outward from the body (2)
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The present invention relates to a body (2) which is an air vehicle; at least one rotor (3) on the body (2), which allows the body (2) to move; at least one wire cutter on the body (2), which cuts various obstacles such as electrical wires or telephone cables contacting the body (2) while moving, and thus prevents the body (2) from getting damaged, wherein in a first position (I) the wire cutter (4) is triggered by the rotation of the rotor (3) around its own axis, such that the wire cutter (4) extends outward from the body (2) and cuts the obstacles contacting the body (2), and in a second position (II) the wire cutter (4) is moved from the first position (I) by the rotation of the rotor (3) around its own axis, and kept in the body (2), wherein at least one actuator (5) provides the movement of the wire cutter (4) from the first position (I) to the second position (II) and from the second position (II) to the first position (I).