Swimming in spacetime: motion by cyclic changes in body shape.
نویسنده
چکیده
Cyclic changes in the shape of a quasi-rigid body on a curved manifold can lead to net translation and/or rotation of the body. The amount of translation depends on the intrinsic curvature of the manifold. Presuming spacetime is a curved manifold as portrayed by general relativity, translation in space can be accomplished simply by cyclic changes in the shape of a body, without any external forces.
منابع مشابه
Swimming in an inviscid fluid
We present a set of equations governing the motion of a body due to prescribed shape changes in an inviscid, planar fluid with nonzero vorticity. The derived equations, when neglecting vorticity, reduce to the model developed in [4] for swimming in potential flow, and are also consistent with the models developed in [2,5,15] for a rigid body interacting dynamically with point vortices. The effe...
متن کاملFlapping flexible fish Periodic and secular body reconfigurations in swimming lamprey, Petromyzon marinus
In order to analyze and model the body kinematics used by fish in a wide range of swimming behaviors, we developed a technique to separate the periodic whole-body motions that characterize steady swimming from the secular motions that characterize changes in whole-body shape. We applied this harmonic analysis technique to the study of the forward and backward swimming of lamprey. We found that ...
متن کاملBody dynamics and hydrodynamics of swimming fish larvae: a computational study.
To understand the mechanics of fish swimming, we need to know the forces exerted by the fluid and how these forces affect the motion of the fish. To this end, we developed a 3-D computational approach that integrates hydrodynamics and body dynamics. This study quantifies the flow around a swimming zebrafish (Danio rerio) larva. We used morphological and kinematics data from actual fish larvae a...
متن کاملDesign and Simulation of Amoebot-A Metamorphic Underwater Vehicle
The Metamorphic Underwater Vehicle (MUV) is a vehicle that propels in the water by continuously changing the shape of its body similar to the motion of microorganism Amoebae. In this article, we describe the basic design of Amoebot, a plastic A4UV that achieves shape-changing capabili@ through the inflation and deflation of water-jilled balioons. A sequence of inflation and dejlation procedure ...
متن کاملMechatronic Design and Locomotion of Amoebot - A Metamorphic Underwater Vehicle
The Metamorphic Underwater Vehicle (MUV) is a vehicle that propels in the water by continuously changing the shape of its body similar to the motion of the microorganism amoebae. In this article, we describe the basic design of Amoebot, a plastic MUV that achieves shape-changing capability through the inflation and deflation of water-filled balloons. A sequence of inflation and deflation proced...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Science
دوره 299 5614 شماره
صفحات -
تاریخ انتشار 2003