Aircraft Cable Cutter With Segmented Cutting Apparatus
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Solution Overview
Problem
Existing cable cutting systems for vehicles, particularly aircraft, often fail to effectively cut cables at low velocities and may not be able to handle cables with high ultimate stresses, posing a risk to the aircraft and its occupants.
Innovation Solution
A cable cutter system incorporating a first cutting apparatus with a recess and a second cutting apparatus featuring multiple cutting surfaces, including a cutter wheel with equidistantly arranged cutting surfaces and a spring mechanism, which can pivot and move to cut the cable, reducing the tensile load required and enabling cutting at low velocities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional cable cutting system is used, then the structure is simple, but the system fails to effectively cut cables with high ultimate stresses at low velocities
Solution Approach 1:
The cable cutting system is divided into multiple independent cutting apparatuses (first cutting apparatus with recess and first cutting surface, second cutting apparatus with second cutting surface). Each apparatus contributes to the cutting action, allowing the system to handle high-stress cables at low velocities without requiring a single overly complex mechanism
Solution Approach 2:
The cutting members are designed to pivot about an axis perpendicular to the first cutting apparatus, allowing dynamic adjustment of the cutting surfaces during operation. The spring member provides dynamic force application, enabling the system to adapt to varying cable resistances and maintain effective cutting across different velocity conditions
2Strength
If high cutting force is applied to cut high ultimate stress cables, then the cable can be cut, but the forward momentum decrease causes discomfort and injury to passengers
Solution Approach 1:
The cutting force is distributed across multiple cutting surfaces (first cutting surface in the recess, second cutting surface from the second cutting apparatus) acting at different locations on the cable. This segmentation of the cutting action reduces the peak force required at any single point, thereby minimizing the momentum change and associated harmful effects on passengers
Solution Approach 2:
The pivoting cutting members and spring mechanism enable a more gradual and controlled cutting process. The dynamic adjustment allows the cutting force to be applied more evenly over time, reducing sudden momentum changes that would cause passenger discomfort or injury
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 effectively cuts cables with high ultimate stresses, such as larger diameter cables, reducing the risk to the aircraft and minimizing discomfort and injury to passengers by reducing the forward momentum decrease during cable cutting.
Implementation Method 1
The spring member in an energized state can be connected to the first cutting member. The spring member can force the first cutting member and the second cutting member toward each other in response to the cable being received between the first cutting member and the second cutting member.
Implementation Method 2
The cutter wheel can include a pivot position about which the cutter wheel can rotate to cut the cable received in the space.
Implementation Method 3
The first cutting member and the second cutting member can form a four bar mechanism with a first support bar and a second support bar to force the first cutting member and the second cutting member toward each other in response to the cable being received between the first cutting member and the second cutting member.
Implementation Method 4
The sensor can include a piezoelectric device.
Data Source
AI summary
Some examples of a cable cutting system include a first cutting apparatus that includes a recess to receive a cable. The system includes a second cutting apparatus separate from and attached to the first cutting apparatus. The second cutting apparatus includes multiple cutting surfaces arranged to cut the cable received at the recess.