عنوان

Water Entry Impact Dynamics of Diving Birds

Number

TL49534

.Language of Text, Soundtrack etc

انگلیسی

Title Proper

Water Entry Impact Dynamics of Diving Birds

General Material Designation

[Thesis]

First Statement of Responsibility

Saberul Islam Sharker

Subsequent Statement of Responsibility

Truscott, Tadd T.

Name of Publisher, Distributor, etc.

Utah State University

Date of Publication, Distribution, etc.

2017

Specific Material Designation and Extent of Item

56

Text of Note

Committee members: Berke, Ryan; Spall, Robert E.

Text of Note

Place of publication: United States, Ann Arbor; ISBN=978-0-355-11882-7

Dissertation or thesis details and type of degree

M.S.

Discipline of degree

Mechanical and Aerospace

Body granting the degree

Utah State University

Text preceding or following the note

2017

Text of Note

Some seabirds (such as Northern Gannets and Brown Boobies) can dive from heights as high as 30 m reaching speeds of up to 24 m/s as they impact the water surface. It is perceived that physical geometry, particularly of the beak, allows them to endure relatively high impact forces that could otherwise kill non-diving birds. Acceleration data from simplified models of diving birds agree with simulated data for one species (Northern Gannet), however, no reliable experimental data with real bird geometries exist for comparison purposes. This study utilizes eleven 3D printed diving birds (five plunge-diving, five surface-diving and one dipper) with embedded accelerometers to measure water-entry impact accelerations for impact velocities ranging between 4.4 - 23.2 m/s. Impact forces for all bird types are found to be comparable under similar impact conditions and well within the safe zone characterized by neck strength as found in recent studies. However, the time each bird requires to reach maximum impact acceleration and its effect represented here by the derivative of acceleration (i.e., jerk), is different based on its beak and head shape. We show that surface diving birds cannot dive at high speeds as the non-dimensional jerk experienced exceeds a safe limit estimated from human impact analysis, whereas those by plunge divers do not.

Mechanical engineering

Subject Term

Applied sciences;Accelerameter;Beak angle;Diving bird;Impact dynamics;Jerk

Yildiz, Hatice

Truscott, Tadd T.

Subdivision

Mechanical and Aerospace

Utah State University

Call Number

1946681079; 10607203

Electronic name

p

[Thesis]

276903

a

Y