Abstract: A device and a method for reducing wind resistance power of a large geotechnical centrifuge are provided. A semicircular tube cylindrical cooling device is provided between an internal side of a high-speed rotor system and a cylindrical shell. A serpentine top semicircular tube cooling plate is provided right above a hanging basket, and return helium gas inlet holes are provided at a center of the top semicircular tube cooling plate. A helium gas in a helium gas storage tank passes through helium gas outlets on the helium gas inlet pipes, and enters a centrifuge chamber from a bottom sealing plate. The helium gas is used to replace air in the centrifuge chamber to reduce the wind resistance power and corresponding energy consumption. No vacuuming is required, so sealing requirements are lower. Heat dissipation equipment is placed inside the centrifuge chamber, and a helium gas circulation wind duct is added.

Abstract: An octogrid structure and method of forming the same for a composite laminate structure is provided. The octogrid sub-structure comprises: a first ply layer comprising a plurality of first elongate tapes oriented in a first direction and a plurality of second elongate tapes oriented in a second direction; and a second ply layer comprising a plurality of third elongate tapes oriented in the first direction and a plurality of fourth elongate tapes oriented in the second direction, the second ply layer being overlaid atop the first ply layer. A first end of each of the elongate tapes is positioned approximately adjacent a midpoint of an adjacently positioned one of the elongate tapes; and a second and opposing end of each of elongate tapes extends freely beyond a central grid portion defined by a length of a portion between the first end and the midpoint of the elongate tapes.

Abstract: A vacuum chamber structure of an ultra-high gravity geotechnical centrifuge device, comprising: a cylindrical shell, a convex head, a bottom head, a lower bearing sealing cover, and a vacuum pressure-bearing chamber formed by sealing a top cylindrical cylinder and an upper sealing plate with sealing rings; wherein a high-speed rotor system is enclosed in the vacuum pressure-bearing chamber, and a cylindrical cooling device is installed between an internal side of the cylindrical shell and the high-speed rotor system. An annular cooling device is provided directly above the hanging baskets on both sides of the centrifuge arm. A vibration isolation expansion joint is arranged at the intersection of the high-speed rotor system and the cylindrical cylinder, which isolates the vibration of the main engine from the vacuum chamber and greatly reduces the vibration.

Abstract: An octogrid structure and method of forming the same for a composite laminate structure is provided. The octogrid sub-structure comprises: a first ply layer comprising a plurality of first elongate tapes oriented in a first direction and a plurality of second elongate tapes oriented in a second direction; and a second ply layer comprising a plurality of third elongate tapes oriented in the first direction and a plurality of fourth elongate tapes oriented in the second direction, the second ply layer being overlaid atop the first ply layer. A first end of each of the elongate tapes is positioned approximately adjacent a midpoint of an adjacently positioned one of the elongate tapes; and a second and opposing end of each of elongate tapes extends freely beyond a central grid portion defined by a length of a portion between the first end and the midpoint of the elongate tapes.

Abstract: A device and a method for reducing wind resistance power of a large geotechnical centrifuge are provided. A semicircular tube cylindrical cooling device is installed between an internal side of a high-speed rotor system and a cylindrical shell. A serpentine top semicircular tube cooling plate is provided right above a hanging basket, and return helium gas inlet holes are opened at a center of the top semicircular tube cooling plate. A helium gas in a helium gas storage tank passes through helium gas outlets on the helium gas inlet pipes, and enters a centrifuge chamber from a bottom sealing plate. The helium gas is used to replace air in the centrifuge chamber to reduce the wind resistance power and corresponding energy consumption. No vacuuming is required, so sealing requirements are lower. Heat dissipation equipment is placed inside the centrifuge chamber, and a helium gas circulation wind duct is added to improve heat exchange coefficient and heat dissipation effect.