ABSTRACT
The interaction mechanism between N95 respirators and human faces without head movement has been investigated in our previous work. Whenever humans don respirators, however, their heads move during regular daily work. Does the respirator have the same performance as that without head movement? This paper investigates the effects of head movement on contact pressure between a N95 respirator and headform. A vertebra-joints system is introduced in order to drive human head moving (up and down, left and right). Five headforms and six N95 respirators are utilized. Each headform and N95 respirator pair has five simulations: does not move, moves up, moves down, moves left, and moves right. Results from 180 simulations have shown that the interaction has changed with head movements. Contact pressure distributions have changed before and after head movements. This indicates that respirator has different performances in different work conditions.
