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Related Experiment Video

Updated: May 2, 2026

A Test Bed to Examine Helmet Fit and Retention and Biomechanical Measures of Head and Neck Injury in Simulated Impact
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A novel algorithm for determining contact area between a respirator and a headform.

Zhipeng Lei1, James Yang, Ziqing Zhuang

  • 1a Human-Centric Design Research Lab, Department of Mechanical Engineering , Texas Tech University , Lubbock , Texas.

Journal of Occupational and Environmental Hygiene
|March 4, 2014
PubMed
Summary

A new computer algorithm accurately determines the contact area between N95 filtering facepiece respirators (FFRs) and headforms. Headform size significantly impacts respirator contact area dimensions, with medium headforms yielding the largest areas.

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Area of Science:

  • Biomechanics
  • Human Factors Engineering
  • Respiratory Protection

Background:

  • Respirator fit is crucial for effective protection, influenced by the contact area between the device and the wearer's face.
  • Quantifying this contact area is essential for improving respirator design and fit testing.

Purpose of the Study:

  • To propose and validate a computer-based algorithm for determining the contact area between N95 filtering facepiece respirators (FFRs) and various headform sizes.
  • To investigate the influence of headform size and FFR sizing systems on the facial contact area.

Main Methods:

  • A computer algorithm was developed to extract intersection surfaces between headforms and N95 FFRs, simulating respirator donning.
  • Computer-aided design tools were used to create superimposed and average contact area surfaces (NURBS).
  • Experimental measurements of contact areas were performed on headform prototypes to validate simulation results.

Main Results:

  • Headform size significantly influenced all measured contact area dimensions (P < 0.0001).
  • N95 FFR sizing systems affected most contact area dimensions (P < 0.05), excluding the chin regions.
  • The medium headform generated the largest contact area, while large and small headforms produced the smallest.

Conclusions:

  • The developed algorithm provides a reliable method for quantifying respirator-to-face contact areas.
  • Headform and respirator sizing are critical factors affecting the facial contact area of N95 FFRs.
  • Findings can inform the design of better-fitting respiratory protection devices.