TAILIEUCHUNG - Biomimetics - Biologically Inspired Technologies - Yoseph Bar Cohen Episode 2 Part 4

Tham khảo tài liệu 'biomimetics - biologically inspired technologies - yoseph bar cohen episode 2 part 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 372 Biomimetics Biologically Inspired Technologies each side. If the leading edges of the body and fins were covered by the same denticles as the majority of the body a swimming shark would deflect the boundary layer away from the body and increase drag. The posterior edges of fins are flexible and denticle-free. This may help to reduce turbulence saving energy lost to the vortices occurring immediately behind the fins Bargar and Thorson 1995 . Three factors affect the drag reducing properties of riblets sharp-edged riblets riblet protrusion height as there is an optimal height for riblets to protrude into the boundary layer beyond which they would interfere with the flow of seawater and the lateral spacing of the riblets to affect the dynamics of the water passing over the skin Bechert et al. 1986 . Biomimetics The structure of shark skin has prompted swimsuit and wetsuit manufacturers to develop new designs to reduce drag in water to improve times for competitive swimmers or to improve navigation by scuba divers. Properties of shark skin have also been used as models for movements of submersible and surface vessels in order to reduce the drag created by the speed of solid boat structures through water. Finally aeronautics research has keyed into the structures of shark skin to reduce air resistance for planes. The human s body with smooth skin covered with hair creates a great deal of drag. Speedo Inc. has developed a swimsuit for competitive swimmers based on shark skin designs. The Speedo Fastskin FSII suit reduces drag in water by as much as 4 . Passive drag affects a swimmer in the streamline position usually after the initial dive into the water and following a turn. During a 50-m race a swimmer is likely to be in the streamline position for up to 15 m. Swimmers from more than 130 countries wore this biomimetic suit at the Sydney Olympics and over 80 of the swimming medals and 13 out of the 15 world records set were with swimmers in this new suit. .

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