Relationship of Protective Mask Seal Pressure to Fit Factor and Head Harness Strap Stretch

Cohen, Kathryn S.

doi:10.21236/ada370293

Cited by 7 publications

(6 citation statements)

References 6 publications

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“…Thus, in the current mask design process, many important decisions are made before designers evaluate the most critical performance requirement, protection. Cohen [3] demonstrated that measuring and evaluating the pressure distribution between the mask sealing surface and face provides valuable information about seal integrity. Cohen also determined relationships between head harness strap stretch (a measure of strap tightness) and either FF or seal pressure.…”

Section: Introductionmentioning

confidence: 99%

Simulating the Interaction between a Respirator and a Headform Using LS-DYNA

Yang¹,

Dai²,

Zhuang³

2009

Computer-Aided Design and Applications

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Respirator use is an integral part of occupational safety and health practice. The challenge is to design respirators with the best fit and highest comfort level for all workers of diverse anthropometry. This paper presents a method to simulate the interaction between a respirator and a headform, and solutions for the universal design of respirators. Three-dimensional digital headforms and respirators are obtained using reverse engineering techniques. The commercial software, LS-DYNA, is used to model and simulate the interaction between a respirator and headform to determine the key factors that affect respirator fit and comfort. Both the respirator and headform are modeled as shell elements and are deformable. The results show that strap forces play an important role in pressure distribution on the face.

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Section: Introductionmentioning

confidence: 99%

Simulating the Interaction between a Respirator and a Headform Using LS-DYNA

Yang¹,

Dai²,

Zhuang³

2009

Computer-Aided Design and Applications

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“…An experimental study of the surface contact pressures was performed by HRED (Cohen, 1996) and was used during this effort as a means of validating the simulation. In this experiment, contact pressures were measured at thirty degree intervals around the face.…”

Section: Resultsmentioning

confidence: 99%

Modeling the Interface Between a Respirator and the Human Face.

Piccione¹,

Moyer²

1997

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“…Cohen [3] described an experimental method for evaluating mask seals by measuring seal pressure distributions. A relationship between FF and sealing pressure distributions for evaluating the sealing performance was developed.…”

Section: Contact Pressure Study Of N95 Filtering Face-piece Respiratomentioning

confidence: 99%

Contact Pressure Study of N95 Filtering Face-piece Respirators Using Finite Element Method

Lei

Yang

Zhuang

2010

Computer-Aided Design and Applications

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Respirators protect workers from hazardous airborne particles. It is important to evaluate respirator comfort and fit for all workers of diverse anthropometry as contact pressure plays a vital role. This paper presents the procedure and results of studying contact pressure of N95 filtering face-piece respirators (FFR) by using a finite element method. Finite element models of respirators and headforms have been improved based on a previous study. The headform model contains a skin layer, muscle layer, and bone layer. The whole facial area is divided into four parts (two areas for cheeks, one area for upper forehead, and one area for chin). Two N95 FFR models (one is onesize-fits-all and the other FFR has two sizes, i.e., small and medium/large) are used to simulate the interaction between the respirator and the headform. The results show that the respirator with two sizes provides better contact pressure distribution than the one-size-fits-all respirator. It has also been shown that the one-size-fits-all respirator works well for the large, medium, and short/wide headforms, but there are indications of potential leakages for the small and long/narrow headforms. For the respirator with two sizes, the medium/large size respirator works well for the large and long/narrow headforms, while the small size respirator works well for the medium, small, and short/wide headforms. The medium/large size respirator has potential leakages for the medium headform. Furthermore, the N95 FFR with two sizes has a more uniform pressure distribution than the one-size-fits-all respirator. Future studies are needed to validate these observations with human subjects.

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Relationship of Protective Mask Seal Pressure to Fit Factor and Head Harness Strap Stretch

Cited by 7 publications

References 6 publications

Simulating the Interaction between a Respirator and a Headform Using LS-DYNA

Simulating the Interaction between a Respirator and a Headform Using LS-DYNA

Modeling the Interface Between a Respirator and the Human Face.

Contact Pressure Study of N95 Filtering Face-piece Respirators Using Finite Element Method

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