A multi-dimensional magnetic negative-stiffness mechanism and a multi-dimensional magnetic negative-stiffness vibration isolation system composed thereof are provided. The multi-dimensional damping system is composed of a positive-stiffness mechanism, a multi-dimensional negative-stiffness mechanism, a floating frame, a vibration isolated body, and a mounting base. The positive-stiffness mechanism is a traditional elastic element connected to the vibration isolated body and the mounting base, and provides supporting forces in an X direction, a Y direction, and a Z direction, and a basic vibration isolation function. The multi-dimensional negative-stiffness mechanism is composed of at least two negative-stiffness magnetic groups. Each negative-stiffness magnetic group may provide one-dimensional or two-dimensional negative stiffness. Through a series connection of the at least two negative-stiffness magnetic groups, a two-dimensional or three-dimensional negative-stiffness effect may be implemented to improve the vibration isolation performance of the system in multiple dimensions.

A composite material includes an upper layer, a lower layer and means arranged so as to diffuse substantially transversely at least part of the kinetic energy induced by an impact on one of said layers, said means cooperating on both sides, with the upper layer and the lower layer. The diffusion means can consist in a network of interassembled base elements and of cavities, forming a three-dimensional structure. A protection device comprising includes an insert consisting of the composite material.

A composite material includes an upper layer, a lower layer and means arranged so as to diffuse substantially transversely at least part of the kinetic energy induced by an impact on one of said layers, said means cooperating on both sides, with the upper layer and the lower layer. The diffusion means can consist in a network of interassembled base elements and of cavities, forming a three-dimensional structure. A protection device comprising includes an insert consisting of the composite material.

Elastomer compositions and, in particular, their use as compositions for forming vibration-damping devices. The elastomer compositions comprise brominated isobutylene-co-alkylstyrene, such as brominated isobutylene-co-para-methylstyrene. One or more additives including a reinforcing filler, a processing aid, a scorch retarder, a curing agent, an activator, an accelerator, and any combination thereof may be included in the elastomer composition. The elastomer compositions exhibit physical properties, heat resistance properties, and long life cycle properties making their use in vibration-damping devices particularly suitable.

The invention relates to the field of transport mechanical engineering and concerns friction shock absorbers for vehicles.

The object of the invention is to improve the operational life, performance and reliability of a friction shock absorber.

The friction shock absorber comprises housing (1) with bottom (2) and with orifice (3) formed by walls (4), internal surfaces (fv) whereof form alternating working beds (V1) and connecting beds (V2), and further comprises friction assembly (5) consisting of pressure wedge (6) and stay wedges (7) in contact with same, said stay wedges being provided with friction surfaces (fp), while return-and-retaining device (8) is located between bottom (2) and friction assembly (5). In addition, the area (S1) of contact between friction surfaces (fp) of stay wedges (7) and internal surfaces (fv) of walls (4) of orifice (3) in working beds (V1) exceeds the corresponding area (S2) of contact in the connecting beds (V2).

The internal surfaces (fv) may be straight, while the values of angles (θ1) between adjacent internal surfaces (fv), which form working beds (V1), are lower than the values of angles (θ2) between adjacent internal surfaces (fv), which form the connecting beds (V2).

The thickness of walls (4) of the orifice (3) is variable with an increase in the direction from the working bed (V1) to the connecting bed (V2).

The contact between pressure wedge (6) and stay wedges (7) is provided along linked curved surfaces (fκ).

Dampers made from polymers modified with nanomaterials (e.g. carbon nanotubes). This novel viscoelastic material has significantly improved damping characteristics making nano-modified polymers excellent materials for viscoelastic dampers, including highly customizable materials and geometries tailored to achieve good damping properties and proper shear stiffness and shear capacity.

Dampers made from polymers modified with nanomaterials (e.g. carbon nanotubes). This novel viscoelastic material has significantly improved damping characteristics making nano-modified polymers excellent materials for viscoelastic dampers, including highly customizable materials and geometries tailored to achieve good damping properties and proper shear stiffness and shear capacity.

A crossbar assembly for facilitating isolation of a sensor assembly from vibration of a payload mounting system on a vehicle comprising an outer crossbar segment, an inner crossbar segment, an isolator, and a damper. The outer crossbar segment comprises a payload mount interface operable to mount to a payload mount, and an outer isolator interface operable to mount to an isolator. The inner crossbar segment comprises a structure interface to mount to a structure, and an inner isolator interface operable to mount to the isolator. The isolator can be supported by the outer and inner crossbar segments. The damper is adjacent the isolator. The isolator is operable to deform in response to relative movement between the outer and inner crossbar segments. The isolator operates to partially decouple the outer crossbar segment from the inner crossbar segment and the damper dampens vibrations propagating between the outer and inner crossbar segments.

An engine mount control apparatus that is an active noise vibration control apparatus according to the present disclosure is characterized by being provided with a housing that has an outer core, an inner core that is disposed inside the outer core, and an electromagnetic coil that is positioned between the outer core and the inner core and by a portion between the outer core and the inner core being filled with a magneto-rheological elastomer containing magnetic particles. The present disclosure enables the maintenance of good static load support performance.

An engine mount control apparatus that is an active noise vibration control apparatus according to the present disclosure is characterized by being provided with a housing that has an outer core, an inner core that is disposed inside the outer core, and an electromagnetic coil that is positioned between the outer core and the inner core and by a portion between the outer core and the inner core being filled with a magneto-rheological elastomer containing magnetic particles. The present disclosure enables the maintenance of good static load support performance.