-
公开(公告)号：US07219614B2
公开(公告)日：2007-05-22
申请号：US10907795
申请日：2005-04-15
IPC分类号： B63B1/38
CPC分类号： B63B1/38 , B63B1/18 , B63B2001/201 , B63B2035/818 , Y02T70/122
摘要： An apparatus and method for reducing surface friction drag on the hull of a surface vessel by entraining air into water flowing in the boundary layer flow along the hull. A hemispherical protrusion creates flow separation by diverting a portion of the water flow away from the surface of the hull, which results in a reduced pressure region downstream from the protrusion. A vent located on the protrusion allow air to flow into the reduced pressure region. The air in the reduced pressure region is entrained into the water due to turbulent mixing from vortices shed on to the rear of the protrusion.
摘要翻译： 一种用于通过将空气引入沿着船体的边界层流中流入的水中来减少表面容器的船体上的表面摩擦阻力的装置和方法。 半球形突起通过将一部分水流转移离开船体表面而产生流动分离，这导致在突出部下游的减压区域。 位于突出部上的通风口允许空气流入减压区域。 减压区域中的空气由于从突出部的后部旋转的湍流混合而被夹带到水中。
-
公开(公告)号：US07597060B2
公开(公告)日：2009-10-06
申请号：US11838397
申请日：2007-08-14
IPC分类号： B63B1/38
CPC分类号： B63B1/38 , Y02T70/122
摘要： An apparatus and method for reducing surface friction drag on the hull of a surface vessel by entraining air into water flowing in the boundary layer flow along the hull. The apparatus creates a reduced pressure region by diverting a first portion of the flow away from the surface of the hull. An air pocket is formed in the reduced pressure region and a second portion of the flow is directed through the air pocket by nozzles, which acts as a plunging jet and entrains air into the boundary layer.
摘要翻译： 一种用于通过将空气引入沿着船体的边界层流中流入的水中来减少表面容器的船体上的表面摩擦阻力的装置和方法。 该装置通过将流体的第一部分转移离开船体的表面而产生减压区域。 在减压区域中形成气穴，并且流体的第二部分通过喷嘴引导通过气穴，喷嘴用作突入射流并将空气带入边界层。
-
公开(公告)号：US07267067B2
公开(公告)日：2007-09-11
申请号：US10905751
申请日：2005-01-19
CPC分类号： B63B1/38 , Y02T70/122
摘要： An apparatus and method for reducing surface friction drag on the hull of a surface vessel by entraining air into water flowing in the boundary layer flow along the hull. The apparatus creates a reduced pressure region by diverting a first portion of the flow away from the surface of the hull. An air pocket is formed in the reduced pressure region and a second portion of the flow is directed through the air pocket by nozzles, which acts as a plunging jet and entrains air into the boundary layer.
摘要翻译： 一种用于通过将空气引入沿着船体的边界层流中流入的水中来减少表面容器的船体上的表面摩擦阻力的装置和方法。 该装置通过将流体的第一部分转移离开船体的表面而产生减压区域。 在减压区域中形成气穴，并且流体的第二部分通过喷嘴引导通过气穴，喷嘴用作突入射流并将空气带入边界层。
-
公开(公告)号：US06394483B2
公开(公告)日：2002-05-28
申请号：US08974287
申请日：1997-11-19
IPC分类号： A63C507
CPC分类号： A63C5/03
摘要： A snowboard whose base is relatively thick in the mounting zones beneath each of the rider's feet and relatively thin between the two mounting zones. Thus, with normal loading applied through the rider's feet to the snowboard, the board will bow into a reasonably good approximation of an arc having a constant radius. Consequently, the portions of the snowboard coming in contact with the surface of the snow will substantially lie on segments of a circular arc, and the back half of the snowboard will substantially follow in the track of the front half of the snowboard. This is achieved by controlling the flexural rigidity in the mounting zones and in the center section between the mounting zones. The curvature of the snowboard in response to the application of forces by its rider is a function of the Area Moment of Inertia (I) of the transverse cross-sectional areas along the snowboard's length. In turn, the Area Moment of Inertia is a function of the geometry of the transverse cross-section. The invention is principally concerned, therefore, with the appropriate selection of the geometry of the transverse cross-section of the various segments of the snowboard's body.
摘要翻译： 在每个骑手脚下方的安装区域中底座相对较厚的滑雪板，并且在两个安装区域之间相对较薄。 因此，当通过骑手的脚施加到滑雪板的正常载荷时，板将弯曲成具有恒定半径的弧的相当好的近似值。 因此，与雪的表面接触的滑雪板的部分将基本上位于圆弧的段上，并且滑雪板的后半部分将基本上沿着滑雪板前半部的轨道。 这是通过控制安装区域和安装区域之间的中心部分的弯曲刚度来实现的。 响应于骑手施加力的滑雪板的曲率是沿着滑雪板长度的横截面积的面积惯量矩（I）的函数。 反过来，惯性面积的力矩是横截面的几何形状的函数。 因此，本发明主要涉及滑雪板本体的各个段的横截面的几何形状的适当选择。
-
公开(公告)号：US06382658B1
公开(公告)日：2002-05-07
申请号：US09253649
申请日：1999-02-20
IPC分类号： A63C504
CPC分类号： A63C5/0405 , A63C5/003 , A63C5/03 , A63C5/12
摘要： A method of making a snowboard or ski so that the bottom surface of the snowboard or ski is capable of bowing into a desired longitudinal curvature, with a circular arc being the preferred shape, in order to enable a “perfect” turn to be carved. The method comprises the steps of selecting a desired longitudinal curvature of the snowboard during turns, determining the desired curvature of the snowboard at a plurality of cross-sectional portions thereof in order to achieve the desired curvature, and selecting the cross-sectional area moments of inertia at each of the plurality of cross-sections to provide the desired curvature. The thickness of the core of the snowboard is the preferred design variable. The center section of a snowboard designed in accordance with this method has smaller average area moment of inertia than one or both of the front and rear mounting zones. Snowboards designed and constructed in accordance with this method exhibit improved turning performance, particularly in sharp, tight turns.
摘要翻译： 一种制作滑雪板或滑雪板的方法，使得滑雪板或滑雪板的底面能够弯曲成所需的纵向曲率，圆弧是优选的形状，以便能够雕刻“完美”的转弯。 该方法包括以下步骤：在转弯期间选择滑雪板的期望纵向曲率，确定滑雪板在其多个横截面部分处的期望曲率，以获得期望的曲率，并且选择横截面积矩 在多个横截面中的每一个处的惯性以提供期望的曲率。 滑雪板的芯的厚度是优选的设计变量。 根据该方法设计的滑雪板的中心部分具有比前后安装区域中的一个或两个更小的平均面积惯性矩。 根据该方法设计和构造的滑雪板表现出改进的转向性能，特别是在锋利的，紧的匝间。
-
公开(公告)号：US5823562A
公开(公告)日：1998-10-20
申请号：US918906
申请日：1997-08-27
CPC分类号： A63C5/0405 , A63C5/03
摘要： A snowboard is disclosed having two cambers centered, respectively, below each of the two boot mounting zones.
摘要翻译： 公开了一种滑雪板，其具有分别位于两个靴子安装区域下方的中心的两个弯曲部。
-
-
-
-
-
搜索结果
6 条记录 (耗时 0.011 秒)
