公开(公告)号：US06427942B2

公开(公告)日：2002-08-06

申请号：US09877428

申请日：2001-06-08

申请人： John V. Howard ,  Ramesh Thiagarajan ,  Michael R. Smith ,  Ashish K. Sareen

发明人： John V. Howard ,  Ramesh Thiagarajan ,  Michael R. Smith ,  Ashish K. Sareen

IPC分类号： B64C2552

CPC分类号： B64C25/52 ,  B64C2025/325

摘要： A skid landing gear for a helicopter, in which the directional stiffnesses of the cross members of the skid landing gear have been de-coupled from one another, such that optimization of the longitudinal stiffniess of the cross members may be performed independently of the optimization of the vertical stiffniess and fatigue life of the cross members. In order to de-couple the stiffnesses in the skid type landing gear, two approaches are employed. In the first approach, the skid landing gear has non-symmetric-section cross members and/or distribution of different materials within the cross-section for de-coupling the vertical stiffness of the cross members from the longitudinal stiffness, such that placement of the ground resonance frequency may be optimized, while retaining the vertical stiffness properties essential for optimizing vertical energy attenuation and fatigue life. In the second approach, mounting devices are employed that provide compliance in selected directions, thereby de-coupling the directional stiffnesses.

摘要翻译： 一种用于直升机的防滑起落架，其中防滑起落架的横向构件的方向刚度已经彼此脱离，使得横向构件的纵向刚度的优化可以独立于优化 十字架的垂直硬度和疲劳寿命。 为了解除滑行式起落架中的刚度，采用了两种方法。 在第一种方法中，防滑起落架具有不对称剖面的横向构件和/或横截面内的不同材料的分布，用于将横向构件的垂直刚度与纵向刚度解耦合，从而使 可以优化地面共振频率，同时保持垂直强度特性对于优化垂直能量衰减和疲劳寿命至关重要。 在第二种方法中，采用在所选方向上提供柔性的安装装置，从而解除方向刚度。

公开(公告)号：US20120114897A1

公开(公告)日：2012-05-10

申请号：US13224532

申请日：2011-09-02

申请人： Ramesh Thiagarajan ,  Suvankar Mishra ,  Mark Chris ,  William Evans, III ,  Mike Mikel

发明人： Ramesh Thiagarajan ,  Suvankar Mishra ,  Mark Chris ,  William Evans, III ,  Mike Mikel

IPC分类号： B32B3/26 ,  B32B38/00 ,  B29C44/02 ,  B32B37/00 ,  B32B1/06 ,  B32B7/12

CPC分类号： B32B3/08 ,  B29C44/025 ,  B29C44/0415 ,  B29C44/086 ,  B29C44/10 ,  B29C44/588 ,  B29C44/60 ,  B29K2075/00 ,  B29K2105/04 ,  B29L2031/3076 ,  B32B1/00 ,  B32B5/18 ,  B32B5/245 ,  B32B5/26 ,  B32B5/28 ,  B32B7/06 ,  B32B7/12 ,  B32B2250/03 ,  B32B2250/40 ,  B32B2260/023 ,  B32B2260/046 ,  B32B2266/0278 ,  B32B2305/022 ,  B32B2305/076 ,  B32B2305/10 ,  B32B2603/00 ,  B32B2605/18 ,  B64C1/068 ,  B64C3/20 ,  B64C3/24 ,  B64C5/10 ,  B64C2001/0072 ,  B64C2027/4736 ,  Y02T50/43 ,  Y10T156/10 ,  Y10T428/233 ,  Y10T428/249953 ,  Y10T428/249982

摘要： A structure includes a skin and a foam member. The foam member has a molded contour, the mold contour being configured to provide tooled surface for the skin. When the skin is a composite skin, the foam member provides support for the skin so that the skin can be cured under heat and pressure. A method of making the foam member for a foam stiffened structure includes creating a mold having an interior cavity which resembles a desired shape the foam member. A subsequent step involves introducing a foam mixture into the mold. Next, the foam mixture is allowed to polymerize so as to expand and distribute within the cavity of the mold. The method further includes selectively controlling a density of the foam member in the mold. The foam member is at least partially cured. The foam member is assembled with a skin to produce the foam stiffened structure.

摘要翻译： 结构包括皮肤和泡沫构件。 泡沫构件具有模制轮廓，模具轮廓被配置成为皮肤提供工具表面。 当皮肤是复合皮肤时，泡沫构件为皮肤提供支撑，使得皮肤可以在热和压力下固化。 制造用于泡沫硬化结构的泡沫构件的方法包括产生具有类似于所需形状的泡沫构件的内部空腔的模具。 随后的步骤包括将泡沫混合物引入模具中。 接下来，允许泡沫混合物聚合，以便在模具的空腔内膨胀和分布。 该方法还包括选择性地控制模具中泡沫构件的密度。 泡沫构件至少部分固化。 泡沫构件与皮肤组装以产生泡沫硬化结构。

公开(公告)号：US06244538B1

公开(公告)日：2001-06-12

申请号：US09314399

申请日：1999-05-19

申请人： John V. Howard ,  Ramesh Thiagarajan ,  Michael R. Smith ,  Ashish K. Sareen

发明人： John V. Howard ,  Ramesh Thiagarajan ,  Michael R. Smith ,  Ashish K. Sareen

IPC分类号： B64C2552

CPC分类号： B64C25/52 ,  B64C2025/325

摘要： A skid landing gear for a helicopter, in which the directional stiffnesses of the cross members of the skid landing gear have been de-coupled from one another, such that optimization of the longitudinal stiffness of the cross members may be performed independently of the optimization of the vertical stiffness and fatigue life of the cross members. In order to de-couple the stiffnesses in the skid type landing gear, two approaches are employed. In the first approach, the skid landing gear has non-symmetric-section cross members and/or distribution of different materials within the cross-section for de-coupling the vertical stiffness of the cross members from the longitudinal stiffness, such that placement of the ground resonance frequency may be optimized, while retaining the vertical stiffness properties essential for optimizing vertical energy attenuation and fatigue life. In the second approach, mounting devices are employed that provide compliance in selected directions, thereby de-coupling the directional stiffnesses.

摘要翻译： 用于直升机的防滑起落架，其中滑行起落架的横向构件的方向刚度已经彼此脱离，使得横向构件的纵向刚度的优化可以独立于优化 横梁的垂直刚度和疲劳寿命。 为了解除滑行式起落架中的刚度，采用了两种方法。 在第一种方法中，防滑起落架具有不对称剖面的横向构件和/或横截面内的不同材料的分布，用于将横向构件的垂直刚度与纵向刚度解耦合，从而使 可以优化地面共振频率，同时保持垂直强度特性对于优化垂直能量衰减和疲劳寿命至关重要。 在第二种方法中，采用在所选方向上提供柔性的安装装置，从而解除方向刚度。