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Area of Science:

  • Automotive Engineering
  • Biomechanics
  • Human Factors Research

Background:

  • Head restraints are crucial for occupant safety, mitigating whiplash injuries.
  • Understanding backset (head-to-headrest distance) is vital for effective head restraint design.
  • Variations in backset during driving conditions require investigation for improved safety standards.

Purpose of the Study:

  • To measure and analyze backset in the driver's position under stationary and driving conditions.
  • To determine the differences in backset between sexes and correlate it with anthropometric variables.
  • To provide data for enhancing vehicle safety test protocols.

Main Methods:

  • Sixty-five subjects (35 males, 30 females) were studied in a Volvo V70 (2007 model).
  • Backset was measured in a self-selected driving posture, both stationary and during driving via video analysis.
  • Statistical analyses included descriptive data, variability, correlation, and t-tests.

Main Results:

  • Mean driving backset was significantly greater than stationary backset (males: +43 mm, females: +41 mm).
  • Males exhibited a larger driving backset (44 mm) than females.
  • Driving backset showed moderate correlations with stature, seated height, and seat back angle in males, and hip width, waist circumference, and weight in females.

Conclusions:

  • The findings highlight the dynamic nature of backset during driving.
  • Results can inform the design of future geometric backset testing protocols, such as RCAR and RCAR-IIWPG.
  • Understanding sex-based and anthropometric influences on backset is key for optimizing head restraint effectiveness.