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Simulated effects of head movement on contact pressures between headforms and N95 filtering facepiece respirators - part 1: headform model and validation.

Authors
Lei-Z; Ji-X; Li-N; Yang-J; Zhuang-Z; Rottach-D
Source
Ann Occup Hyg 2014 Nov; 58(9):1175-1185
NIOSHTIC No.
20045010
Abstract
In a respirator fit test, a subject is required to perform a series of exercises that include moving the head up and down and rotating the head left and right. These head movements could affect respirator sealing properties during the fit test and consequently affect fit factors. In a model-based system, it is desirable to have similar capability to predict newly designed respirators. In our previous work, finite element modeling (FEM)-based contact simulation between a headform and a filtering facepiece respirator was carried out. However, the headform was assumed to be static or fixed. This paper presents the first part of a series study on the effect of headform movement on contact pressures - a new headform with the capability to move down (flexion), up (extension), and rotate left and right-and validation. The newly developed headforms were validated for movement by comparing the simulated cervical vertebrae rotation angles with experimental results from the literature.
Keywords
Simulation-methods; Respirators; Respiratory-equipment; Personal-protective-equipment; Face-masks; Air-purifying-respirators; Anthropometry; Headgear; Testing-equipment; Equipment-reliability; Biomechanical-modeling; Biomechanics; Motion-studies; Analytical-models; Pressure-testing; Materials-testing; Equipment-design; Physical-exercise; Performance-capability; Author Keywords: contact pressure; finite element method; filtering facepiece respirator; headform; head movement
Contact
James Yang, Department of Mechanical Engineering, Human-Centric Design Research Laboratory, Texas Tech University, Lubbock, TX 79409, USA
CODEN
AOHYA3
Publication Date
20141101
Document Type
Journal Article
Email Address
james.yang@ttu.edu
Funding Type
Contract
Fiscal Year
2015
NTIS Accession No.
NTIS Price
Identifying No.
Contract-254-2009-M-31878; Contract-254-2010-M-36735; Contract-254-2012-M-52258; M092014
Issue of Publication
9
ISSN
0003-4878
NIOSH Division
NPPTL
Priority Area
Healthcare and Social Assistance
Source Name
Annals of Occupational Hygiene
State
TX; PA
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