Elastic Vehicle Door Edge Protector for Damage-Free Contact
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Solution Overview
Problem
Existing vehicle doors, particularly in the aeronautical field, face challenges in maintaining precise adjustments between the door and fuselage skins to prevent contact during flight deformations and vibrations, which can lead to damage and hinder door operation, while also compromising aerodynamic performance.
Innovation Solution
A field protector is integrated with the door skin, made of elastic material with a specific profile, allowing contact between the door and fuselage without damage, maintaining aerodynamic performance by reducing the need for precise adjustments and ensuring the door can open post-contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If precise adjustments are made to centering stops to prevent skin contact, then damage prevention is improved, but installation complexity increases and aerodynamic performance deteriorates due to increased clearance
Solution Approach 1:
A field protector made of elastic material is introduced as an intermediary element between the door skin and the fuselage skin. This protector absorbs contact forces during vibrations and minor crashes, preventing direct skin-to-skin contact and damage without requiring precise adjustment of centering stops. The elastic material deforms to accommodate clearance variations while maintaining protection functionality.
Solution Approach 2:
The invention changes the material parameter by using elastic material for the field protector instead of rigid stops. This allows the system to tolerate a range of clearance values (2-5mm) without requiring precise adjustment, as the elastic material adapts to different clearance conditions while still preventing damage through controlled deformation.
2Ease of manufacture
If clearance between centering stops is increased to simplify installation, then ease of manufacture is improved, but aerodynamic performance deteriorates due to increased gap between skins
Solution Approach 1:
The field protector's elastic properties enable the system to function effectively across a range of clearance values (2-5mm). This parameter range allows manufacturers to use larger clearances for easier installation and assembly, while the elastic protector maintains aerodynamic smoothness by deforming to fill gaps during normal operation, thus preserving aerodynamic efficiency.
Solution Approach 2:
The field protector transitions from a static rigid stop to a dynamic elastic element that adapts its shape and position based on operational conditions. During installation, it accommodates larger clearances; during flight, it deforms to maintain aerodynamic continuity, thus resolving the conflict between installation ease and aerodynamic performance.
3Loss of energy
If field protector is made sufficiently rigid to maintain aerodynamic performance, then aerodynamic efficiency is improved, but reliability deteriorates as the door may jam during minor crashes
Solution Approach 1:
The field protector uses elastic material with specific mechanical properties that provide sufficient rigidity to maintain aerodynamic performance during normal flight conditions, while simultaneously possessing enough flexibility to deform and allow door opening during minor crashes. The elastic modulus and geometric design are optimized to balance these conflicting requirements.
Solution Approach 2:
The field protector's dynamic response varies with the magnitude of applied forces. Under normal aerodynamic pressures, it maintains a rigid configuration for aerodynamic efficiency. Under extreme forces during minor crashes, it transitions to a flexible state that allows door movement, thus resolving the contradiction between aerodynamic performance and emergency functionality.
4Ease of operation
If field protector allows contact between door and fuselage skins, then ease of operation is improved, but damage risk increases without protection
Solution Approach 1:
The field protector serves as a protective intermediary layer between the door skin and fuselage skin. It allows contact forces to be transmitted through the elastic material rather than directly between the skins, preventing damage while enabling the door to operate through vibrations and minor crashes without jamming. The elastic deformation absorbs impact energy and prevents permanent damage.
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 field protector reduces installation complexity by allowing increased clearance tolerance, preserving door functionality and aerodynamics by minimizing deflection and friction, while ensuring the door can open without damaging the skins.
Implementation Method 1
having sufficient flexibility in a direction parallel to the clearance between the skins so that, in the event of a minor accident, the skins remain at a distance greater than a minimum distance of 3 mm when the centering stops come into contact, while having a transverse rigidity in the internal-external direction limiting a deflection of the protector to 2 mm under a pressure differential from the inside to the outside of 1 psi (69 mBar) due to the aerodynamic flow
Data Source
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AI summary
The invention relates to an assembly of a vehicle door and of a panel (1) surrounding the door (3), wherein an edge protector (4) extends along the skin of a vehicle door (3a) next to the skin of the panel (1a) and has a portion that is interposed between the skins (1a, 3a), following, in a nominal position, the geometric alignment of the outer faces thereof. This edge protector (4) has a changing profile in the middle portion (4b) and is made up of an elastic material such that it exhibits sufficient flexibility in a direction parallel to the distance between the skins (1a, 3a) and a transverse stiffness in the internal-external direction, and such that the contact of the edge protector with the skin of the panel (1a) does not block the opening of the door or damage the skins (1a, 3a).