What does this research mean for the field?

Seat backrests and headrests significantly alter head-neck vibration responses by increasing peak frequencies and mitigating localized intervertebral disc stress, particularly in the C5-C6 segment, under uniaxial and biaxial excitations. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To systematically investigate how seat backrests and headrests alter the biodynamic response and intervertebral disc stress of the head-neck complex under uniaxial and biaxial vibrations.

September 2, 2026Proceedings of the Institution of Mechanical Engineers Part D Journal of Automobile Engineering

Influence of seat backrest and headrest on head-neck vibration responses based on modal analysis: Uniaxial and biaxial excitations

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Authors

JZJingfang Zhang HQHong-Lei Qi SLShi-Qi Liu

Discussion

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Overview

Biomechanical modeling reveals backrests and headrests alter vibration transmission and relieve cervical spine stress under multiaxial loads, suggesting key targets for vehicle seat design.

Key Points

To systematically investigate how seat backrests and headrests alter the biodynamic response and intervertebral disc stress of the head-neck complex under uniaxial and biaxial vibrations.
Constructed five 3D biodynamic finite element models of the human-seat system evaluating rigid and elastic seats with or without a backrest and headrest.
Simulated uniaxial (horizontal X and vertical Z) and biaxial (X + Z) vibration excitations using modal and random response analyses across five backrest angles.
Identified three primary resonance modes in X and Z axes, with backrest and headrest presence shifting head-neck peak response frequencies more substantially than seat stiffness alone.
Under uniaxial excitation, the backrest reduced X-direct-axis seat-to-head transmissibility (STHT) but amplified other direct- and cross-axis STHTs, while biaxial excitation exacerbated cross-axis coupling.
Peak intervertebral disc stress consistently concentrated at the C5–C6 spinal segment, displaying higher sensitivity to horizontal X-axis excitation but significant mitigation when backrest and headrest supports were present.

Cite This Study

Zhang et al. (2026) studied this question.

synapsesocial.com/papers/6a97e2d9c562ede874ec73d4 https://doi.org/10.1177/09544070261481893

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September 2, 2026Proceedings of the Institution of Mechanical Engineers Part D Journal of Automobile Engineering

Influence of seat backrest and headrest on head-neck vibration responses based on modal analysis: Uniaxial and biaxial excitations

View Full Paper

Ask AI

Bookmark

Authors

JZJingfang Zhang HQHong-Lei Qi SLShi-Qi Liu

Discussion

Member takes

Overview

Biomechanical modeling reveals backrests and headrests alter vibration transmission and relieve cervical spine stress under multiaxial loads, suggesting key targets for vehicle seat design.

Key Points

To systematically investigate how seat backrests and headrests alter the biodynamic response and intervertebral disc stress of the head-neck complex under uniaxial and biaxial vibrations.
Constructed five 3D biodynamic finite element models of the human-seat system evaluating rigid and elastic seats with or without a backrest and headrest.
Simulated uniaxial (horizontal X and vertical Z) and biaxial (X + Z) vibration excitations using modal and random response analyses across five backrest angles.
Identified three primary resonance modes in X and Z axes, with backrest and headrest presence shifting head-neck peak response frequencies more substantially than seat stiffness alone.
Under uniaxial excitation, the backrest reduced X-direct-axis seat-to-head transmissibility (STHT) but amplified other direct- and cross-axis STHTs, while biaxial excitation exacerbated cross-axis coupling.
Peak intervertebral disc stress consistently concentrated at the C5–C6 spinal segment, displaying higher sensitivity to horizontal X-axis excitation but significant mitigation when backrest and headrest supports were present.

Cite This Study

Zhang et al. (2026) studied this question.

synapsesocial.com/papers/6a97e2d9c562ede874ec73d4 https://doi.org/10.1177/09544070261481893

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