A shock absorber has a first and second end surfaces opposite to each other in an axial direction, and a plurality of connection surfaces. The first end surface is an N-sided polygon (N is an integer of 3 or more and the second end surface is an M-sided polygon (M is an integer of 4 or more and more than N). (M−N) vertices are provided at intermediate positions in the axial direction on a circumferential surface defined by the plurality of connection surfaces. From the vertices, one first ridgeline reaches one vertex of the first end surface and two second ridgelines reach a corresponding one of two vertices of the second end surface. The remaining vertices are connected to each other by (2×N−M) third ridgelines. The first ridgeline, the second ridgelines, and the third ridgelines define the plurality of connection surfaces.

The invention relates to a vibration damper for connecting two devices to one another, in particular an engine to an environment (100) of the engine, for example a car body, wherein the vibration damper includes a damping section (20) and a fastening section (10), wherein the mounting portion (10) is formed with first and second pipe socket portions (14) having a flange (12), and wherein the damping portion (20) at least partially surrounds the fastening portion (10) at the outer surface thereof.

Energy dampening and/or dispersing systems may include a gel member having a top surface and a bottom surface, an aerated gel member having a top surface and a bottom surface, and the top surface of the aerated gel member secured to the bottom surface of the gel member. In some embodiments, the energy dampening and/or dispersing systems may include a support structure secured to the gel member, and a cover extending over the top surface of the support structure and the bottom surface of the aerated gel member. The energy dampening and/or dispersing systems may be operable in ballistic garments, footwear, sporting goods, and vehicles.

A bushing includes a body that is cylindrical; a bore through the body; a channel extending along an inner face of the bore; and a groove on a substantially planar surface of the bushing and including a first end intersecting with an end of the channel and a second end extending radially from the bore.

Embodiments of the invention are shown in the figures, where a system for vibration detection is shown, the system comprising: one or more drivelines including a rotatable component rotatable about a rotational axis relative to another component; an electrical machine having a rotor and a stator rotatable with respect to one another, the rotor being arranged to at least one of drive and be driven by a part of the driveline, the electrical machine being adapted to provide signals indicative for at least one of a motion and a force between the rotor and the stator and a torque applied on the rotor; and an analysis unit adapted to receive the signals and to detect a vibration signature of the rotatable component with respect to the other component based on the signals.

A device for damping vibrations in a structure including a first (or inner) element rotatably mounted around a rotational axis and a second (or outer) element rotatably mounted around said rotational axis. A radius (R1) of a circle portion delimitating the first element with respect to the rotational axis, being smaller than a radius (r2) of a circle portion delimitating the second element with respect to the rotational axis.

A damper for damping vibrations of a structure comprises: a first damping unit, comprising a first damping body having a first mass (m.sub.1), a first spring element having a first spring constant (k.sub.1) and a first damping element having a first damping constant (c.sub.1), wherein said first damping body is configured to be attached to said structure via said first spring element and said first damping element; and a second damping unit, comprising a second damping body having a second mass (m.sub.2), a second spring element having a second spring constant (k.sub.2) and a second damping element having a second damping constant (c.sub.2), wherein said second damping body is configured to be attached to said first damping body via said second spring element and said second damping element.

An elastic wave cloaking lattice-based metamaterial for cloaking an object within a void includes a lattice of connected unit cells arranged to form a void, each unit cell comprising a mass and a plurality of connecting springs, the mass coupled by the plurality of connecting springs to masses in adjacent unit cells, the plurality of connecting springs comprising at least two large springs of a first length and at least two short springs of a second length, the first length greater than the second length, the springs and masses having relational and mechanical characteristics to facilitate elastic wave cloaking in the totality of the lattice. The lattice as a whole has metamaterial properties resulting from the positional relationship and mechanical properties of masses and connecting springs of the unit cells such that the lattice at least partially cloaks an object or material portioned within the void from elastic waves.

There is provided a vibration suppression device of a rope-like body that can use a negative restoring force that amplifies a displacement of a rope-like body of an elevator to prevent the displacement from becoming unstable. A vibration suppression device (21) includes a first displacement measurement unit, a first displacement amplifier, and a control unit (24). The first displacement measurement unit measures a displacement in a lateral direction of the rope-like body due to vibration about an equilibrium position (20) at a first position (P1) in a longitudinal direction of the rope-like body. The first displacement amplifier applies, to the rope-like body, a negative restoring force that amplifies the displacement of the rope-like body. The control unit (24) causes the first displacement amplifier to apply a negative restoring force smaller than a positive restoring force, based on the displacement measured by the first displacement measurement unit.

A vibration damping structure (60), a detection system and a sequencing system. The vibration damping structure (60) is used in the detection system. The vibration damping structure (60) comprises a main body (62) and a support body (64), the main body (62) is connected to the detection system by means of the support body (64), the main body (62) comprises an imaging module (10), an upper layer structure (66), a lower layer structure (68) and an intermediate structure (70), the imaging module (10) is mounted on the upper layer structure (66), the lower layer structure (68) bears the upper layer structure (66) by means of the intermediate structure (70), and the natural frequency of the main body (62) is greater than or equal to √{square root over (2)} times the internal excitation frequency.