An apparatus which damps oscillation in a ski, the apparatus comprising an enclosure, a cavity encompassed by the enclosure, and an aggregate located in the cavity. The cavity has a dimension in a direction perpendicular to a gliding surface of the ski which is larger than a thickness of the ski in a location adjacent to the enclosure. The aggregate, in its tapped density, occupies substantially less volume than a volume of the cavity, thereby allowing significant travel of the aggregate in the cavity. Oscillation accelerates and decelerates the enclosure, resulting in accelerations and decelerations of the aggregate which cause it to acquire and lose kinetic energy. The aggregate's acquisition and loss of kinetic energy attenuates the oscillation.

Systems and methods are disclosed for aircraft wheels and brakes systems for use in, for example, an aircraft. In this regard, a damper for an axle may comprise a cylindrical canister defining a cavity configured to be inserted into a bore of the axle, the cavity at least partially filled with a damping material. The damper may act as a particle damper or a tuned mass damper to mitigate harmonic vibration of the axle and therefore the wheel and brake system.

According to certain embodiments, a container assembly for protecting a flexible panel comprises a back panel positioned behind the flexible panel and offset by a first substantially airtight compartment, a front panel positioned in front of the flexible panel and offset by a second substantially airtight compartment, and a stiffener panel positioned in front of the front panel and offset by a third substantially airtight compartment. The front, back, and stiffener panels each comprise one or more rigid materials. Each rigid material has higher natural frequency and lower excursion properties than the flexible panel. The container assembly is tuned using fixed, gas-piston principles to impart the higher natural frequency and lower excursion properties of the rigid materials to the flexible panel such that the natural frequency of the flexible panel increases and the extent to which the flexible panel experiences excursions greater than 350 microns is reduced.

According to certain embodiments, a container assembly for protecting a flexible panel comprises a back panel positioned behind the flexible panel and offset by a first substantially airtight compartment, a front panel positioned in front of the flexible panel and offset by a second substantially airtight compartment, and a stiffener panel positioned in front of the front panel and offset by a third substantially airtight compartment. The front, back, and stiffener panels each comprise one or more rigid materials. Each rigid material has higher natural frequency and lower excursion properties than the flexible panel. The container assembly is tuned using fixed, gas-piston principles to impart the higher natural frequency and lower excursion properties of the rigid materials to the flexible panel such that the natural frequency of the flexible panel increases and the extent to which the flexible panel experiences excursions greater than 350 microns is reduced.

An example method of assembling a particle damped gas turbine engine component according to an exemplary aspect of the present disclosure includes, among other things, holding damping media within a cavity of a gas turbine engine component using magnetic force.

Disclosed are devices and methods for reducing resonant vibrations in impact tools. The embodiments disclosed herein include the use of certain particles positioned within an impact tool, such as a hammer, for converting the energy of vibration to heat energy resulting from collisions between the particles.

Disclosed are devices and methods for reducing resonant vibrations in impact tools. The embodiments disclosed herein include the use of certain particles positioned within an impact tool, such as a hammer, for converting the energy of vibration to heat energy resulting from collisions between the particles.

A system for mitigating vibration of a mass may include an elastic membrane enclosing at least one interior space and having an outer surface, where at least a bottom portion of the outer surface is coupled to a transportable supportive surface, and at least a top portion of the outer surface supports a load. The system may further include at least one port coupling the outer surface to the at least one interior space, where the port provides a source of fluid ingress into the interior space and fluid egress out of the interior space. The system may additionally include granular material distributed within the at least one interior space, where a packing density of the granular material is adjustable between a first jammed state having a first packing density of granular materials and a second jammed state having a second packing density of granular materials to accommodate different loads.

The present disclosure combines a particle impact damping (PID) chamber with an elastomer damping (ED) component (also referred to as a block) in an assembly to dampen vibration when placed under a piece of hi-fi equipment. According to an aspect of the present invention, there is provided an assembly for damping vibration comprising a main body defining a first cavity and a second cavity, a plurality of particle impact dampers contained within the first cavity of the main body; and an elastomer damper contained within the second cavity.

The present disclosure combines a particle impact damping (PID) chamber with an elastomer damping (ED) component (also referred to as a block) in an assembly to dampen vibration when placed under a piece of hi-fi equipment. According to an aspect of the present invention, there is provided an assembly for damping vibration comprising a main body defining a first cavity and a second cavity, a plurality of particle impact dampers contained within the first cavity of the main body; and an elastomer damper contained within the second cavity.