Wave-Shaped Impact Protection Plate for Aircraft Fuselage
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Solution Overview
Problem
Military and humanitarian transport aircraft face significant damage and safety risks due to stone chip impacts during landings on unpaved runways, which can impair flight safety and increase repair costs, and propeller aircraft are vulnerable to ice impacts, necessitating effective impact protection solutions.
Innovation Solution
An impact protection plate with a wave-shaped fiber-reinforced plastic layer for absorbing kinetic energy and a smooth cover layer for enhanced durability, designed for mounting on aircraft fuselage, particularly in critical underside regions, to act as a 'crumple zone' and prevent damage from stone chips and propeller ice impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional smooth protective layer is used on the aircraft fuselage, then the surface appearance is maintained, but stone chip and ice impact damage occurs frequently
Solution Approach 1:
The wave-shaped layer is positioned between the outer skin and the expected impact zone, creating a pre-engineered cushioning zone that absorbs impact energy before it reaches the aircraft structure. This beforehand cushioning mechanism dissipates kinetic energy from stone chips and ice through elastic deformation of the wave profile, preventing damage to the aircraft fuselage.
Solution Approach 2:
The wave-shaped layer converts the harmful kinetic energy of impacting stones and ice into beneficial elastic deformation energy. The wave profile deforms elastically under impact, transforming the destructive force into useful work that dissipates energy, thereby protecting the aircraft structure while the outer skin remains intact.
2Reliability
If an impact protection layer is added to the aircraft fuselage, then impact damage is reduced, but the weight of the aircraft increases
Solution Approach 1:
The impact protection layer uses composite construction combining a wave-shaped fiber-reinforced plastic layer with a smooth outer skin layer. This composite structure provides high impact resistance through the fiber-reinforced material while maintaining lightweight properties, achieving effective protection without significant weight penalty.
Solution Approach 2:
The wave-shaped layer functions as a flexible shell that absorbs impact energy through elastic deformation. This thin-film approach provides effective impact protection while minimizing added weight compared to rigid bulk structures, as the wave profile deforms to absorb energy rather than requiring massive rigid protection.
3Strength
If a wave-shaped layer with high tensile strength is used, then impact energy absorption is improved, but the complexity of the layer structure increases
Solution Approach 1:
The impact protection system is segmented into two distinct layers: a wave-shaped fiber-reinforced plastic layer for impact energy absorption and a smooth outer skin layer for surface protection and aerodynamics. This segmentation allows each layer to be optimized for its specific function while maintaining overall structural integrity and managing complexity through modular design.
Solution Approach 2:
The wave-shaped layer is applied specifically to the underside of the fuselage where impact damage occurs, rather than covering the entire aircraft surface. This local application provides targeted impact protection at critical zones while minimizing the overall complexity and weight addition to the aircraft structure.
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 impact protection plate effectively absorbs and distributes impact forces, reducing repair costs and downtime, ensuring operational safety with good ventilation to prevent corrosion, and can be easily mounted on existing vehicles without major modifications.
Implementation Method 1
The forces and energies that occur with stone chips (in the case of an aircraft, in particular during takeoff and landing) or propeller ice impact may be well absorbed and elastically cushioned by use of the impact protection plate according to the invention.
Implementation Method 2
The impact protection plate according to the invention represents a type of 'crumple zone' for impacting masses.
Implementation Method 3
The wave structure of this layer has the additional advantage that good ventilation of the interspace between the impact protection plate and the outer skin of the vehicle is ensured, so that corrosion processes at this location are prevented or at least impeded.
Data Source
AI summary
An impact protection plate is provided for mounting on the structure of an aircraft. The impact protection plate includes a first layer, close to the aircraft, made of a fiber-reinforced plastic having a wave-shaped pattern of alternating elevations and depressions, the transverse tensile strength of the fiber-reinforced plastic being greater than 50 MPa. The impact protection plate includes a second layer situated on the first layer, remote from the aircraft, and is made of a fiber-reinforced plastic, the elongation at break of the reinforcement fibers being greater than 3%.