A laundry treating apparatus is provided. The laundry treating apparatus includes a cabinet, a drum accommodated in the cabinet, and a dynamic absorber provided to absorb oscillation of the cabinet. The dynamic absorber includes a first moving mass movably provided on the support plate to absorb oscillation transmitted to the cabinet and a second moving mass movably provided on the support plate to absorb oscillation transmitted to the cabinet. Each of the first and second moving masses includes a single mass made of a metal material or a mass in which a plurality of thin metal plates are coupled to overlap each other, and the first moving mass has a mass greater than that of the second moving mass.

A flat shaped spring may include a spring element. The spring element may have, in a longitudinal section along a central longitudinal axis extending along an axial direction, two profile halves disposed on opposite sides of the central longitudinal axis. The two profile halves may each have a first profile portion and a second profile portion. The first profile portion may have a curvature opposed to the second profile portion. Two outer ends of the spring element facing away from the central longitudinal axis, and which lie opposite one another in a longitudinal direction extending perpendicularly to the axial direction, may be connected to one another via at least one connection element such that the spring element and the at least one connection element collectively form a closed profile in the longitudinal section.

Embodiments described herein relate generally to apparatus with ribbed structures or geometries for stiffness and damping control, and methods of producing the same. In some embodiments, an apparatus includes a ribbed structure having a set of ribs, configured to deform elastically under shock. In some embodiments, the set of ribs can have a sinusoidal wave shape. In some embodiments, the set of ribs can have a heterogeneous wave shape. In some embodiments, the set of ribs can have material properties that change along the length of the ribbed structure, such as wavelength, amplitude, wave shape, and material thickness.

A lamina emergent torsional (LET) joint that includes an integrated membrane to reduce, or eliminate, certain unwanted motions and/or displacements associated with the operation of the LET joint is disclosed. The membrane-integrated LET joint (i.e., M-LET) can be used as a hinge for a lamina emergent mechanism and/or as a surrogate fold for an origami application to ensure accurate and repeatable transitions from a planar (i.e., lamina) state to a non-planar (i.e., lamina-emergent) state, and vice versa.

An article for damping vibrations by constrained layer damping comprising: a first constraining layer; a second constraining layer; and a damping layer disposed between the first and second constraining layers, wherein the first and second constraining layers each independently comprise a fibre-reinforced composite material, wherein the first and second constraining layers each independently have a thickness from 1.5 to 5 mm, wherein the damping layer comprises a viscoelastic material, wherein the damping layer has a thickness from 1 to 10 mm and wherein the article has a thickness from 6 to 50 mm. The invention also relates to the use of said article for damping vibrations in a vehicle.

A method for isolating vibrations for centrifuge testing devices is provided. The method comprises coupling a test payload platform to a number of piezoelectric actuators and coupling the piezoelectric actuators to a reaction mass coupled to a centrifuge arm. A layer of vibration-absorbing material is sandwiched between the reaction mass and the centrifuge arm. The centrifuge arm is rotated around an axis, and the test payload platform is vibrated with the piezoelectric actuators as the centrifuge rotates, wherein the layer of vibration-absorbing material prevents vibrations from traveling down the centrifuge arm.

A lamina emergent torsional (LET) joint that includes an integrated membrane to reduce, or eliminate, certain unwanted motions and/or displacements associated with the operation of the LET joint is disclosed. The membrane-integrated LET joint (i.e., M-LET) can be used as a hinge for a lamina emergent mechanism and/or as a surrogate fold for an origami application to ensure accurate and repeatable transitions from a planar (i.e., lamina) state to a non-planar (i.e., lamina-emergent) state, and vice versa.

An improved adhesive-type weight system for use with vehicle wheels includes one weight or a series of weights arranged as a tape. Each weight is formed of a flexible thin iron plate material having a perimeter with opposing lateral ends and opposing lateral sides. The series of weights can be oriented end-to-end or side-to-side, and each weight includes two planar sections separated by a center raised section. The center section can be a peak, an arch, a step, or some other raised configuration. Additionally, it can be tapered from one side to another. On the underside of each weight is adhesive and a release paper, which can be continuous across a series of weights or separated and applied under each individual weight. Where weights are attached to adjacent weights in series, preferably a notch or cut extends along the connection to encourage easy separation.

A gasket includes an elastic part containing a rubber having a dynamic-to-static ratio, Kd/Kst, of 2.5 or lower, wherein the dynamic-to-static ratio, Kd/Kst, is a ratio between a dynamic spring constant, Kd, and a static spring constant, Kst. The dynamic spring constant, Kd, represents a constant as measured under conditions of 23±2° C., 100 Hz, and a strain amplitude of 0.1% according to JIS K6394:2007, and the static spring constant, Kst, represents a constant as measured under conditions of 23±2° C. and a strain amplitude of 0.1% according to JIS K6394:2007.

A gasket includes an elastic part containing a rubber having a dynamic spring constant of 1.5 g/μm or lower as measured under conditions of 23±2° C., 100 Hz, and a strain amplitude of 0.1% according to JIS K6394:2007.