| 摘要 |
<p>A motion generator comprising an aperture 4 through which fluid flows and a buoyant plug 2 for the aperture. The plug and the aperture are shaped such that, with the relative buoyancy and/or elasticity of the plug in a fluid flow, the plug oscillates in a fluid flow through the aperture to provide a reciprocal motion in the actuator element 3. Preferably there is a locking member to prevent or limit the reciprocating motion. The plug may have electively variable buoyancy provide by removable weights and plug may have an undulating surface for engagement with the aperture. The generator may also include a guide means in the form of a sleeve or a funnel to define the direction of the reciprocating motion.</p> |
