UAM Impact Dispersion Structure Using Crash Unit and Dash Reinforcement
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Solution Overview
Problem
Urban Air Mobility (UAM) vehicles face unique challenges in absorbing and dispersing impact loads during collisions, as the direction and magnitude of impact differ from those experienced by ground mobilities, potentially leading to higher impulse application.
Innovation Solution
A dispersion structure for impact is designed for UAM vehicles, featuring a front body frame with a crash unit at the front end and a dash reinforcement assembly fastened to the rear surface of the crash unit. This structure disperses impact loads to the wing unit and the rear of the body, reducing the load applied to the passenger space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a crash unit is added to the front of the UAM airframe, then impact absorption capability is improved, but device complexity increases
Solution Approach 1:
The front body frame is divided into multiple structural components including the crash unit, dash reinforcement assembly, and wing unit. Each segment serves a specific function in impact management, allowing the system to absorb and disperse impact forces through distributed structural elements rather than a single monolithic component.
Solution Approach 2:
The crash unit incorporates an inclined lower end that extends in the longitudinal direction, creating a three-dimensional impact dispersion path. This dimensional approach allows impact forces to be redirected along multiple spatial pathways (to the wing unit and rear of the body) rather than being confined to a single linear transmission path.
2Strength
If impact load is transmitted to the passenger space, then structural integrity is maintained, but harmful effects increase
Solution Approach 1:
The dash reinforcement assembly serves as an intermediary structural element positioned between the crash unit and the passenger space. It fastens to the front body frame and provides a barrier that prevents direct transmission of impact loads to the passenger compartment, thereby protecting occupants while maintaining overall structural integrity.
Solution Approach 2:
Impact forces are redirected into three-dimensional transmission pathways that route loads to the wing unit and rear of the body rather than allowing direct forward-to-backward transmission through the passenger space. The inclined geometry of the crash unit creates angular load paths that disperse forces laterally and rearward.
3Reliability
If the lower end of the crash unit is inclined in the longitudinal direction, then impact dispersion effectiveness is improved, but manufacturing precision requirements increase
Solution Approach 1:
The crash unit features an asymmetric geometry with the lower end inclined relative to the upper end. This asymmetric design creates the desired impact dispersion effect by directing forces at specific angles, and the inclination can be built into the manufacturing process as a fixed geometric feature rather than requiring precise post-manufacturing adjustment.
Solution Approach 2:
The inclination angle of the lower end is optimized to specific parameter ranges that maximize impact dispersion effectiveness. By establishing target parameter ranges for the inclination angle and integrating this geometry into the manufacturing process, the system achieves effective impact dispersion while managing manufacturing precision requirements through standardized production methods.
Data Source
AI summary
Proposed is a structure. The structure includes a front body frame configured to surround a front surface of an airframe, a crash unit disposed at a front end of the body front frame, and a dash reinforcement assembly fastened to the front body frame and disposed on the rear surface of the crash unit.