Aircraft Tire Protrusion Dynamics for Landing Speed Synchronization
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Solution Overview
Problem
Aircraft tires experience excessive rubber wear and shocks during landing due to high pressurized friction and mismatched rotating speeds between the wheel and the aircraft, leading to acceleration or deceleration shocks.
Innovation Solution
The aircraft tire features protrusions on its outer peripheral side that receive flight wind pressure, with a hollow structure containing a weight that deforms under centrifugal force, adjusting the wind pressure receiving area to match the aircraft's rotating speed with the target speed, thereby reducing friction and shocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If curved vanes are arranged on the tire body to receive flight wind pressure and rotate the wheel ahead of touchdown, then rubber tire wear is suppressed, but acceleration or deceleration shocks are generated at touchdown
Solution Approach 1:
The protrusion is designed with a hollow structure containing a weight that can move freely inside. During rotation, centrifugal force causes the weight to shift position, dynamically changing the protrusion's shape and flight wind pressure receiving area. This dynamic adjustment allows the system to adapt to different rotational speeds, reducing shocks at touchdown while maintaining the wind pressure reception function for suppressing tire wear.
Solution Approach 2:
The invention changes the geometric parameters of the protrusion by allowing the weight to move within the hollow structure. As the weight position changes with rotational speed, the effective receiving area and aerodynamic characteristics of the protrusion are modified. This parameter change enables optimization of the wheel's rotational acceleration profile, reducing the speed differential at touchdown and thereby minimizing shocks.
2Force
If the wheel is rotated ahead of touchdown using flight wind pressure, then pressurized friction between runway and tire is reduced, but the rotating speed may exceed or fall short of the target rotating speed
Solution Approach 1:
The movable weight inside the hollow protrusion acts as a passive feedback mechanism. As the wheel's rotational speed changes, the centrifugal force on the weight changes, causing it to move and alter the protrusion's aerodynamic profile. This creates a self-regulating system where the wind pressure reception area automatically adjusts based on the current rotational speed, providing feedback control to maintain the target rotating speed at touchdown.
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
This design effectively reduces rubber tire wear and minimizes acceleration or deceleration shocks by synchronizing the wheel's rotating speed with the aircraft's flying speed, ensuring a smoother landing process.
Implementation Method 1
a plurality of curved vanes are arranged on a side of a tire body for receiving flight wind pressure. Through the action of the flight wind pressure received by the curved vanes, an aircraft wheel is rotated ahead of the touchdown
Implementation Method 2
the protrusion has hollow structure into which a weight is inserted and the protrusion is deformed by centrifugal force applied to the weight in association with a rotational motion of the wheel
Implementation Method 3
the protrusion is deformed by centrifugal force applied to the weight in association with a rotational motion of the wheel thereby to change a flight wind pressure receiving area of the protrusion so that acceleration of a rotating speed of the wheel ahead of the touchdown increases or decreases
Data Source
Figure 1~1(c)
Figure 2
Figure 3~3(d)
AI summary
To provide an aircraft tire capable of suppressing rubber tire wear during landing and shocks which accelerate or decelerate an aircraft at touchdown. An aircraft tire 3 includes, on a side of a tire body 4 constituting an outer peripheral part of an aircraft wheel 1, a protrusion 5 for receiving flight wind pressure. The wheel 1 is rotated ahead of the touchdown by the action of the wind pressure received by the protrusion 5 in a direction in which the wheel 1 rotates during a landing roll. Weight 15 is inserted into a hollow part 11 of the protrusion 5. Through use of centrifugal force on the weight 15 in association with a rotational motion of the wheel 1, the protrusion 5 is deformed to change its wind pressure receiving area for bringing rotational speed of the wheel 1 ahead of the touchdown close to a rotating speed of the wheel that is consistent with a flying speed of the aircraft making the touchdown.