What question did this study set out to answer?

To evaluate the variability of whole-body vibration in seated individuals within passenger cars based on the International Roughness Index (IRI).

April 19, 2026

Variance of whole-body vibration of seated person in passenger car

Key Points

To evaluate the variability of whole-body vibration in seated individuals within passenger cars based on the International Roughness Index (IRI).
Measured whole-body vibration in 58 test vehicles across 6 categories.
Analyzed the relationship between vibration total value and IRI using a regression function.
Calculated a 95% confidence interval for overall vibration at the seat surface.
A regression function relating overall vibration total value to IRI was estimated.
Identified thresholds of IRI related to comfort reactions during vibration exposure.
A single IRI value can vary widely in its corresponding vibration values affecting comfort levels.

Abstract

The variability in whole-body vibration (WBV) of a seated person measured in the passenger car was evaluated. The vibration variability was evaluated as a function of the International Roughness Index (IRI). Vibration was measured on 58 test vehicles of 6 different categories. A two-parameter regression function relating the overall vibration total value to its 95% confidence interval and IRI was estimated. The identified regression function may help detect the IRI threshold. The IRI threshold could be derived from the boundaries of comfort reactions to vibration environments, as specified in ISO 2631-1: 1997. Calculation of a 95% confidence interval for the measured overall vibration total value at the seat surface showed that a single IRI value can correspond to vibration values that span up to comfort levels according to ISO 2631-1:1997.

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