A tire noise reducing system comprises a wheel rim, a pneumatic tire to be mounted on the wheel rim and a noise damper to be disposed in an annular tire cavity enclosed by the wheel rim and the pneumatic tire mounted thereon, wherein the noise damper is made of a multi-cellular material whose volume S2 is in a range of not less than 0.4% of the volume S1 of said annular tire cavity. Preferably, the specific gravity of the damper is set in a range of from 0.005 to 0.06.

Tire noise reducing system

Provided is a low noise pneumatic tire in which the noise absorbing member on the inner peripheral surface of the tire is made less likely to be damaged when the pneumatic tire is removed from the rim. The pneumatic tire includes a noise absorbing member of a porous material which is attached to an inner peripheral surface of the tire. In the pneumatic tire, a lubricant is applied to the inner peripheral surface of the noise absorbing member. Alternatively, both end portions, in a tire width direction, of the inner peripheral surface of the noise absorbing member are covered with protective layers harder than the noise absorbing member.

Low noise pneumatic tire

The present invention is directed to a brace apparatus having a core member configured to absorb energy generated by seismic or other forces by undergoing plastic deformation. A buckling restraining assembly is included for maintaining the structural integrity of the brace after the core member has undergone plastic deformation. The buckling restraining assembly includes one or more bearings is located proximal the core member. The bearings are adapted to minimize friction between the core member and the buckling restraining apparatus. An air gap is positioned between the core member and the one or more bearings of the buckling restraining apparatus are adapted to prevent bonding of the core member and buckling restraining assembly. Projections are included in the core member of the brace apparatus to minimize movement of the middle portion of the core member relative to the buckling restraining assembly.

Bearing brace apparatus

A vibration attenuating device (5, 20, 20', 42, 70, 110) for loudspeaker enclosures (41, 90, 96, 97) and other mechanical vibrating bodies (51, 61, 80) includes one or more damping plates 1(a, b), 4(a, b), 5a, 7(a, b, c, d), 9(a, b, c, d, e), 20(a, b, c, d), 70(a, b, c, d, e), 110(a, b, c, d, e) of viscoelastic material positioned to receive vibration energy transferred from the vibrating body. The vibration energy is transferred away from the speaker enclosure (41, 90, 96, 97) or other body (51, 61, 80) and is dissipated as heat due to the internal molecular structure of the viscoelastic material, suppressing noise normally produced by the vibrating body. In various different embodiments, the vibration damping device includes damping plates shaped or mounted in such a way as to provide for attenuation of a wide band of frequencies of vibration. The damping plates themselves may each have a configuration providing for continuously varying frequency response along the length or circumference of the plate, and may be included a plurality of different-sized plates, each responding essentially to a different frequency band.

Vibration damping device

A pneumatic tire with a noise damper made of a spongelike multi-cellular material is disclosed. The noise damper is divided into small dampers to improve the high-speed durability of the tire. The noise damper is provided with a water-impermeable outer coating to prevent water from infiltrating into the spongelike multi-cellular material during transporting, store keeping and the like.

Pneumatic tire with noise damper

The running characteristics of a tire for a wheel are improved to provide a more quiet run, by attaching to an inner and/or outer surface of the tire vibration absorbing elements. Vibration absorbing elements may even be inserted into the tire material itself. The vibration absorbing elements are secured to the tire surface in a force and moment or torque transmitting manner by vulcanization or by a suitable adhesive. A strap may hold the individual absorbing elements together or the elements may form integral parts of the strap which is secured to the tire surface, for example, by a rubber vulcanizing operation. The vibration absorber elements may be secured to an inner tube instead of to the tire.

Wheel tire with noise absorbing means

A wide-band vibration damper for damping sound propagating in a solid body includes at least one horn member having a broad end or side and a tapering end. The broad horn side or end is rigidly connected to the solid body which is to be dampened in its vibration. The tapering end of the horn member is connected to a supporting rigid point through a damping material such as a foam material or the like.

Wide-band vibration damper

A damper for sound conducted or propagating in solids is constructed to ecially damp oscillations or vibrations of the bending type particularly in plates, housings, girders, rails, rods, etc. The damper is connected to the structural member to be damped in such a manner that the damping force is taken up by the structure member itself. For this purpose a damping element having a high rigidity against bending is secured longitudinally to a structural member to be damped. The structural member and the element form the damping unit. Due to the high flexural rigidity, the damping element behaves like a solid platform or a fixed point, such that vibrations of the structural member cause a relative motion between the structural member and the damping element. This relative motion provides excellent damping characteristics which may even be improved by placing a viscous damping material between the structural member and the element.

Damper for sound conducted in solids

A large structure such as a building is damped by reinforcing steel rods or bars which are divided into segments which are, at least partially, decoupled from one another in their force or load transmitting capacity. Additionally, the steel segments are enclosed by a damping material layer or film which in turn is encased by a sheet metal jacket. The so prepared reinforcing rods are embedded in the poured concrete of the structure or otherwise secured to the structure in a force transmitting manner. In further embodiment a sheet metal member with checkerboard forming grooves and/or ridges is coated with the damping material at least on one side thereof, preferably the side facing the concrete structure. The sheet metal member is anchored to the concrete structure. In both embodiments vibration causing force components are caused to travel at least partially through the vibration damping material.

Method and apparatus for damping vibrations in large structures, such as buildings

In a gas-filled vehicle tire are provided for the purpose of reducing the sound radiation to the tire force and moment positively connected vibration absorber (4). The vibration absorber are preferably mounted inside the tire, but can also be attached to the outer side surfaces of the tires. The vibration absorber may be formed, for example, triangular, tubular or crescent-shaped in cross-section.

Oskar Bschorr

Papers

Wheel tire with noise absorbing means

Wide-band vibration damper

Damper for sound conducted in solids

Method and apparatus for damping vibrations in large structures, such as buildings

Gas-filled tyre