Related Experiment Video
Updated: Apr 27, 2026

Structural Design and Manufacturing of a Cruiser Class Solar Vehicle
Published on: January 30, 2019
Effects of seat structural dynamics on current ride comfort criteria
1a School of Aerospace, Mechanical and Manufacturing Engineering, RMIT University , Melbourne , Australia.
Abstract:
The ISO 2631-1 ( 1997 ) provides methodologies for assessment of the seated human body comfort in response to vibrations. The standard covers various conditions such as frequency content, direction and location of the transmission of the vibration to the human body. However, the effects of seat structural dynamics mode shapes and corresponding resonances have not been discussed. This study provides important knowledge about the effects of vehicle seat structural vibration modes on discomfort assessment. The occupied seat resonant frequencies and corresponding vibration modes were measured and comfort test was carried out based on the paired comparison test method. The results show that the ISO 2631-1 ( 1997 ) method significantly underestimates the vibration discomfort level around the occupied seat twisting resonant frequencies. This underestimation is mainly due to the ISO suggested location of the accelerometer pad on the seatback. The centre of the seatback is a nodal point at the seat twisting mode. Therefore, it underestimates the total vibration transferred to the occupant body from the seatback.
Practitioner Summary:
The effects of the vehicle seat structural dynamics have not been discussed in the human body vibration ISO . The results of this research show that the current measurement method suggested by ISO 2631-1 (1997) can significantly underestimate the vibration discomfort level at around the seat structural vibration mode.
Related Concept Videos
Normal and Tangetial Components: Problem Solving
Design Consideration
The factor of safety is another key...
Indeterminate Structure
Bending of Members Made of Several Materials
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each material's...
Yield Criteria for Ductile Materials under Plane Stress
The Maximum Shearing Stress Criterion, also known as...
Constraints and Statical Determinacy

