Aircraft Seat Test Device Load Transfer
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Solution Overview
Problem
The increased weight of seats in the aeronautics industry due to improved passenger comfort leads to locally increased loads, necessitating improved load transfer during dynamic tests to meet CS 25.562/FAR 25.562 conditions, which existing test structures fail to adequately address.
Innovation Solution
A test device comprising a load cell, a seat rail with a bar and upper chord, and a load transfer means with U-profiles that contact the bar and are fixed to the load cell, along with a floor plate integrated into the test structure to enhance local load transfer, utilizing existing installation elements like screws, clips, and grooves for fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If seat weight is increased to improve passenger comfort, then passenger comfort is improved, but local load transfer capacity deteriorates
Solution Approach 1:
The invention transitions from a one-dimensional load transfer path (through the bar only) to a two-dimensional load distribution system by adding floor plates that extend laterally and engage with the seat rail crown and surrounding structure, thereby increasing load transfer capacity without increasing seat weight
Solution Approach 2:
The load transfer system is divided into multiple discrete components: the bar, floor plates, crown, and surrounding structure, each serving specific load transfer functions. This segmentation allows optimization of each component's load-bearing contribution to meet CS 25.562/FAR 25.562 conditions
2Device complexity
If conventional test structures are used, then test structure simplicity is maintained, but load bearing capacity deteriorates
Solution Approach 1:
The invention merges multiple load-bearing elements (bar, floor plates, crown, surrounding structure) into an integrated test structure that works together to transfer loads, thereby achieving higher load bearing capacity while maintaining reasonable structural simplicity through the use of standard fixation elements
Data Source
AI summary
A test structure for dynamic seat tests comprises a load cell, a seat rail with a bar and a upper chord, a load transfer device, which comes into contact with opposite sides of the bar of the seat rail and is fixed to the load cell and an integrated floor plate which is fixed to the upper chord of the seat rail and to the load transfer device.