The present invention relates to an elastic metamaterial for reducing vibrations of a flexible structure such as a main cable of a tether system for controlling an orbit of a satellite revolving around a planet, and a method for improving a vibration reduction performance thereof, and more particularly, to an elastic metamaterial having an improved precision, in which a ratio of a cross-sectional area of a pendulum ring may be adjusted to maintain a frequency characteristic other than a band gap generated due to the elastic metamaterial even in a state where a mass of the pendulum ring is not changed, and a band gap (R_ring) generated due to the pendulum ring of the elastic metamaterial and a band gap (R_beam) generated due to the elastic beams may be combined into one band gap to expand a vibration damping range, and a method for improving a vibration reduction performance thereof.

Disclosed is a damper structure in contact with a connection unit for coupling a first coupling structure part and a second coupling structure part, including a damper part formed of an elastic material and at least one fixing part coupled to at least one surface of the damper part and protruding outward, and coming into contact with the connection unit and moving toward the damper part by pressure applied by the connection unit when the connection unit is separated or fastened.

An example flywheel energy storage device includes a continuously curved fiber-resin composite ovoid shell. Hubs are concentrically disposed within and outside the shell at the shaft. A plurality of radially oriented, fiber-resin composite helical wraps of uniform width are used to construct the ovoid shell and couple the shell to the hubs for co-rotation and torque transfer. Integrated internal structures are attached to the external ovoid shell and provide compression support for the external ovoid shell. Upon rotation, the ovoid shell elongates slightly to increase the flywheel effective moment of inertia at operational speeds.

A component in the form of a crash element is made of a fibre composite material, the wall of which is constructed at least predominantly from bundles of carbon fibres. The carbon fibre filaments are arranged parallel to one another within the fibre bundles, and the bundles are embedded in a polymer matrix. Within the wall of the component the bundles are distributed uniformly and have a substantially isotropic orientation as considered perpendicularly to a first and/or second surface.

The present invention features a metamaterial including a plurality of unit cells, in which each unit cell includes two interacting members to dissipate energy. Also provided herein are assemblies including such metamaterials and methods of manufacture.

An energy absorbing structure includes a base, a loading platform, a pair of side supports, a center support, and a pair of flexible segments. The loading platform is spaced apart from the base. The side supports project from the base toward the loading platform. The center support projects from the loading platform toward the base. The flexible segments extend from the side supports to the center support and connect the side supports to the center support. The flexible segments have straight edges and curved surfaces disposed between the straight edges. The straight edges extend from the side supports to the center support and are oriented at an oblique angle relative to the base. Each of the curved surfaces faces one of the base and the loading platform.

The present invention relates to the field of transport mechanical engineering. Objectimprove performance and operational reliability of a friction shock absorber. The friction shock absorber (FIG. 2) comprises housing (1), whose walls form orifice (2), and bottom (4) that is in contact with return-and-retaining device (5) contacting a friction assembly that consists of the following elements fitted out with friction surfaces (f1-f10): supporting plate (10), pressure wedge (6), stay wedges (7), and reverse-U-shaped movable plates (9) fitted out with side shelves (14) that cover guide plates (8) and are located on supporting plate (10). Return-and-retaining device (5) is available between the guide plates. Additional return-and-retaining device (11) is available between the pressure wedge and the supporting plate. Recesses for the return-and-retaining device and hard lubricant inserts are available on the guide plates; Movable plates may be partially T-shaped forming side shelves that are located on the supporting plate. Hooks (15, 16) are available on the pressure wedge and stay wedges, located so as to enable a mutual contact during the back stroke of the pressure wedge.

A shock absorber assembly having a wheel assembly including first and second coupling points, and first and second shock absorber elements. Each shock absorber element includes a housing portion defining a bore, and a rod slidably coupled within the bore such that the shock absorber element has a variable length. Each rod is coupled to a respective coupling point of the wheel assembly. The shock absorber assembly is arranged to maintain the relative positions of the first and second housing portions such that the longitudinal axis of the first bore has a generally fixed relationship with respect to the longitudinal axis of the second bore.

Embodiments of the present invention generally relate to a novel system, device, and methods for providing an isolator for components and instrumentation to isolate vibrations, shock, static or quasi-static loads, thermal loads, and electrical currents. The novel isolator has an asymmetrical shape, experiences uniform motion under quasi-static loading, and reduces the effective modal mass across a range of frequencies. The novel isolator outperforms conventional vibration isolators in terms of cost, schedule (manufacturing time and lead time), heat dissipation, and performance.

A wideband vibration suppression device utilizing properties of a sonic black hole, comprising: a vibration absorber (101) comprising a uniform portion (1011) of a fixed thickness and a conical portion (1012) integrally connected to the uniform portion (1011), the conical portion (1012) extending from the junction in such a manner that the thickness thereof gradually decreases from the thickness (d1) of the uniform portion (1011) to a predetermined thickness (d2); and a damping layer (102) attached to the conical portion (1012) of the vibration absorber (101).