Simulated effects of head movement on contact pressures between headforms and N95 filtering facepiece respirators - part 1: headform model and validation.
Lei-Z; Ji-X; Li-N; Yang-J; Zhuang-Z; Rottach-D
Ann Occup Hyg 2014 Nov; 58(9):1175-1185
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.
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
James Yang, Department of Mechanical Engineering, Human-Centric Design Research Laboratory, Texas Tech University, Lubbock, TX 79409, USA
Contract-254-2009-M-31878; Contract-254-2010-M-36735; Contract-254-2012-M-52258; M092014
Healthcare and Social Assistance
Annals of Occupational Hygiene