A rail damper mounting apparatus including a clipping device adapted to clip onto a rail, and a mounting device adapted to allow an oscillator to secure thereto. The rail damper mounting apparatus forms at least three clipping points with a rail when the rail damper mounting device is installed to the rail. A rail damping system containing one or more such rail damper mounting apparatus is also disclosed. With at least three clipping points/areas in the mount apparatus, it provides a strong clipping force compressing the wedge-liked rail foot by a very stiff clip.

Disclosed is a novel methodology for vibration and noise control using modular rail particle damper in rail transit systems, which comprises steps: determining a target damper module corresponding to a vibration frequency content of a rail system, multiple target damper modules are adopted; connecting target damper module by adopting a connecting module so as to form a rail particle damper; and installing rail particle damper at rail web to conduct vibration and noise control on the rail system. Target damper modules are connected through connecting modules to form an integrated rail particle damper, a wide vibration mitigation frequency range is formed by adopting different target damper modules, and therefore rail particle damper is suitable for reducing broadband vibration and noise generated in rail systems under different operating environments.

The invention relates to a vibration absorber arrangement (2) for attaching at least one vibration absorber (4) to a rail (1), comprising: a clamping means (3) which has a clamp fastening portion (12) and a fastening portion (11) for at least one vibration absorber (4) on the outside thereof, wherein the clamp fastening portion (12) can be clamped between one end (16) of a clamp (5) and a foot (8) of the rail (1) and the fastening portion (11) presses with its inside against a web (9) of the rail (1), the clamp (5) being formed as an integral spring clip.

The invention relates to anti-noise installation for a guided transport track having a U-shaped cross section, the two branches of which form the lateral walls (15, 16) of the track and the central zone of which, connecting the two branches, forms at least one runway (18) for a guided transport vehicle (50), characterised in that said installation comprises a plurality of acoustic panels (30, 31, 34, 35, 38, 39) arranged relative to one another so as to form at least one chamber (20) for confining the noise resulting from the passage of a vehicle (50) over at least one runway (18), which chamber can be provided around said noise source while extending as far as a free end of at least one branch of the U, each panel (30, 31, 34, 35, 38, 39) forming at least one portion of a partition of a noise-confinement chamber (20).

A noise damper for reducing noise from a vibrating element which vibrates at a vibrational frequency, wherein the noise damper is configured to be in contact with the vibrating element such that when the noise damper is in contact with the vibrating element a noise amplitude at a point in a surrounding of the vibrating element is given by an attenuation factor times the noise amplitude at the point in the surrounding when the noise damper is disconnected from the vibrating element, the noise damper comprising: a polymer matrix, the polymer matrix being in a solid phase and forming a shape; a plurality of hollow particles dispersed in the polymer matrix, each hollow particle having a shell encapsulating a gas filled cavity, each hollow particle having a hollow particle size, and the plurality of hollow particles being dispersed at a hollow particle concentration in the polymer matrix; wherein the hollow particle size and the hollow particle concentration are configured to set the attenuation factor below an attenuation factor threshold at the vibrational frequency of the vibrating element, the hollow particle size being in a range wherein the largest dimension is between 20 μm and 2000 μm.

A clip assembly for securing first and second tuned mass dampers to respective first and second sides of a rail. The clip assembly includes a bar element having a connector portion extending between first and second ends thereof and formed to be positioned in a predetermined location relative to the rail at least partially under a foot of the rail, and a first clamping arm connected with the connector portion at the first end of the connector portion, the first clamping arm being formed to engage the first tuned mass damper. The bar element also includes a linkage section located at the second end of the connector portion. The clip assembly includes a second clamping arm extending between upper and lower ends thereof, the lower end comprising a locking portion securable to the linkage section, and the upper end being formed for engagement with the second tuned mass damper.

An acoustic sound absorptive panel or block is provided that is made from a plurality of materials and volumes selected such that each discrete volume of material has a sufficiently different sound absorption profile, resulting in a system that provides better overall sound absorption of traffic noise from motorways and railways in a practical and cost-efficient manner.

The present disclosure provides, as a sleeper pad for railroad sleepers in which a nonwoven fabric is attached to a rubber pad by a thermal fusion process, a nonwoven fabric-integrated sleeper pad using a rubber pad embedded with a stiffener and methods of manufacturing and constructing the same, which can adjust vertical support stiffness of the rubber pad by the stiffener embedded in the middle of the rubber pad and which can secure the flatness of the rubber pad by resisting bending deformation due to a difference in shrinkage between rubber and nonwoven fabric.

A tuned mass damper for damping airborne vibrations at one or more rail frequencies from a rail generated by movement of wheels over the rail. The tuned mass damper includes one or more damper elements including a damper element material, and a body element including a body material. The damper elements are at least partially embedded in the body element. The body element has inner and lower exterior surfaces formed to fit within first and second pockets on opposite first and second sides of the rail defined by a web portion and a foot. The damper element material and the body material are selected and formed so that the tuned mass damper vibrates in response to movement of the wheels over the rail at one or more damper frequencies that at least partially interferes with the rail frequencies.

A damping arrangement for tracks to be travelled over by rail vehicles having flanged wheels, including a) a rail, and b) an outer lateral profile of elastomer material which bears on the outer side of the rail at least in a region of a lateral outer rail head flank and in a region of an outer rail head underside, wherein the outer lateral profile has, in the region of the outer rail head underside and in the region of the lateral outer rail head flank, close to the rail, a soft region which is elastically resilient with respect to the rail head, and, in the region of the lateral outer rail head flank, remote from the rail, a substantially non-elastic hard region.