Dual-Layer Mobile Body Buffer to Suppress Collision Retroaction
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Solution Overview
Problem
Existing mobile bodies using low-hardness materials for buffering experience repulsion after deformation, leading to retroaction and unintended tumbling due to internal elastic elements, which is undesirable.
Innovation Solution
A mobile body design featuring a dual-layer buffer system with a deep layer of low Young's modulus material and a surface layer of low repulsion elasticity material, combined with a movable unit that can switch to an evacuated state upon loss of control, to absorb impact and suppress retroaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a low-hardness material is used for buffering, then buffering effect is improved, but retroaction after collision occurs due to repulsion from internal elastic elements
Solution Approach 1:
The buffer is divided into two distinct layers: a deep layer made of low-hardness material for buffering, and a surface layer made of high-hardness material to prevent retroaction. This segmentation allows each layer to perform its specific function independently, resolving the contradiction between buffering effect and retroaction suppression.
Solution Approach 2:
Different regions of the buffer have different material properties. The deep layer has low hardness for effective buffering, while the surface layer has high hardness to suppress repulsion and retroaction. This local differentiation of material quality allows simultaneous achievement of both buffering and retroaction suppression.
2Strength
If a flexible member with internal elastic elements is used for buffering, then buffering is achieved, but repulsion causes unintended tumbling in the mobile body
Solution Approach 1:
The buffer structure is segmented into two layers with different material properties. The surface layer's high hardness prevents the repulsion that would cause tumbling, while the deep layer's low hardness provides the necessary buffering capability, thus maintaining mobile body stability during and after collision.
Solution Approach 2:
The buffer uses a composite structure combining two materials with different mechanical properties: a low-hardness material for buffering and a high-hardness material for stabilizing. This composite approach allows the buffer to simultaneously provide cushioning and prevent unintended tumbling.
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 dual-layer buffer system effectively absorbs impact and prevents retroaction, maintaining stability and reducing unintended tumbling, while allowing for efficient motion and control of the mobile body.
Implementation Method 1
Buffering has been performed upon a collision by utilizing elastic deformation of a flexible member disposed on a portion of a mobile body expected to collide
Implementation Method 2
the surface layer material has a modulus of repulsion elasticity lower than the deep layer material
Data Source
AI summary
There is provided a mobile body including a mobile body main body, a movable unit that is attached to the mobile body main body and provides propulsive force to the mobile body main body, and a buffer attached to a surface of the mobile body main body. The buffer includes a deep layer material that covers the surface of the mobile body main body, and a surface layer material provided at a position more distant from the surface of the mobile body main body than the deep layer material. The surface layer material has a modulus of repulsion elasticity lower than the deep layer material.