EVA design: Lessons learned

Ross, Jerry L.

doi:10.1016/0094-5765(94)90142-2

Cited by 9 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The current U.S. space suit, extravehicular mobility unit (EMU) is pressurized with 100% oxygen at 0.29 atm (220 mmHg or 29.6 kPa) during EVA [1,2]. According to the pressure differential between the inside and outside of EMU, the flexibility of the suit and therefore mobility is lowered, and the activity must be hard exercise [3]. Thus, working in EMU generates heat from the human body, and the heat can go nowhere in the enclosed insulated suit.…”

Section: Introductionmentioning

confidence: 99%

Self-perspiration garment for extravehicular activity improves skin cooling effects without raising humidity

2014

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Self-perspiration garment for extravehicular activity improves skin cooling effects without raising humidity

2014

View full text Add to dashboard Cite

“…If the inner suit pressure is the same as the atmospheric pressure of 1 atm (101.4 kPa or 14.7 psi) on the earth surface or cabin pressure of the International Space Station [6], decompression sickness is not induced. However, the larger pressure differential prevents flexibility of the suit and therefore mobility [5]. Considering the pressurized space-suit glove, the structure surrounding the finger joint can be approximated by an inflatable fabric tube subjected to a bending moment from the hand.…”

Section: Pressurization Of the Eva Suitmentioning

confidence: 99%

“…The oxygen pressure is sufficient for breathing because the EMU is pressurized with pure oxygen as described above. Even with this low pressure, the suit is stiff, restricts movement, and is fatiguing to work in because of expansion; i.e., the pressure differential between the inside and outside of the suit [5]. If the inner suit pressure is the same as the atmospheric pressure of 1 atm (101.4 kPa or 14.7 psi) on the earth surface or cabin pressure of the International Space Station [6], decompression sickness is not induced.…”

Section: Pressurization Of the Eva Suitmentioning

confidence: 99%

Development and Evaluation of a Glove for Extravehicular Activity Space Suit without Prebreathing

Tanaka¹

2014

J Ergonomics

View full text Add to dashboard Cite

The current United States space suit, called an extravehicular mobility unit (EMU), is pressurized with 100% oxygen at 0.29 atm (4.3 psi or 29.6 kPa) in the vacuum of space. This pressure is much lower than that on the earth or in the International Space Station, and prebreathing is required to avoid decompression sickness (DCS). Higher pressure can reduce the risk of DCS, but mobility would be sacrificed due to larger pressure differential between the inside and outside of the suit. To solve the issues regarding mobility, we employed elastic material. If high mobility is acquired, higher pressurization can be employed. Thus, we developed an elastic glove pressurized at 0.65 atm, which is the minimal pressure to avoid decompression sickness without prebreathing.Range of motion with the nonelastic glove at 0.29 atm, which is simulated current EMU, was similar to that of the elastic glove at 0.65 atm. However, the required force evaluated by electromyography during finger flexion using elastic glove at 0.65 atm was smaller than that using the nonelastic glove at 0.29 atm. These results will encourage further development and investigation of a new extravehicular activity suit.

show abstract

“…Thus, to avoid VGE and to safely perform EVA without prebreathing, at least 0.65 atm with pure oxygen is required. However, higher suit pressure would sacrifi ce the fl exibility or mobility of the suit due to expansion of the suit caused by the pressure differential between the inside of the suit and the outside vacuum ( 9 ). In other words, if adequate mobility is obtained, higher pressurization is possible.…”

mentioning

confidence: 99%