The invention provides an exhaust purification device capable of suppressing the temporal decrease in NOx catalyst removal efficiency due to soot accumulation. The invention provides an exhaust purification device using an air injection nozzle to inject pressurized air into a casing of a catalyst reactor containing an NOx catalyst as a catalyst and removing soot adhering to the NOx catalyst, wherein it is determined and externally notified that there is abnormal deterioration in the NOx catalyst when the pressure difference P in exhaust between the upstream and downstream sides of the NOx catalyst has increased by at least a first reference pressure difference increase Pt1, which is the allowable amount of pressure difference increase, above the pressure difference Pi in exhaust between the upstream and downstream sides of the catalyst in the initial state at the same exhaust flow rate Ve.

A sound proof material here disclosed comprises an exterior material layer 8 including a holding material 3 made of a woven fabric and a skin material 2 made of a thermoplastic resin film, and a sound absorbing material layer 9, the exterior material layer 8 being laminated on the sound absorbing material layer 9 so that the skin material 2 is located on the surface side of the sound proof material, whereby the sound proof material can endure long-time use without deterioration in moldability under inhibition of aging in severe operating environments so that the sound proof material can be suitably used while suppressing sound from a sound source around an engine installed in an engine compartment of an automobile.

A wheel resonator for a vehicle may include a resonant plate which has an annular structure that is wound around a rim portion of a wheel while maintaining predetermined tension, has resonant holes formed at predetermined intervals in a circumferential direction, and forms a resonant chamber together with a surface of the rim portion, and sealing plates formed integrally with both end portions of the resonant plate, and tightly attached to and supported on an inner wall surface of the rim portion.

A flywheel housing assembly for an internal combustion engine includes a flywheel housing for accommodating a flywheel. The flywheel housing is configured to connect with a part of the internal combustion engine, the flywheel housing further having an outer side region intended to face an oil pan of the internal combustion engine, wherein the outer side region comprises a through hole and a vibration absorbing material portion arranged to seal the through hole.

A method and apparatus for noise reduction in a semi-truck tractor. The semi-truck tractor has hood cowling that is carried on an upper hood support mounted to a firewall of the semi-truck tractor. The invention includes applying a resilient sleeve to the upper hood support to eliminate a noise generated by vibration of the hood cowling when supported by the upper hood support. The resilient sleeve has an opening at a proximal end of the sleeve. The sleeve is dimensioned to surround an exposed face of the upper hood support when mounted to the firewall. The resilient sleeve provides a low friction barrier between the hood cowling and the upper hood support with the hood cowling in a closed position and supported by the upper hood support.

An integrated power electronics (IPE) module is provided. The IPE module includes an IPE casing including at least one panel and a power inverter module (PIM) carrying the IPE casing. The PIM is housed within an internal chamber. The panel includes an acoustic black hole plate having an acoustic black hole zone including at least one acoustic black hole. Each acoustic black hole includes a geometric center and a damper. The acoustic black hole plate has a decreasing acoustic black hole plate thickness from an outer edge of the acoustic black hole to the geometric center, and the decreasing acoustic black hole plate thickness traps vibration energy for efficiency attenuation. The damper is coupled to the acoustic black hole plate and is located at the geometric center.

A tiered, wedge-shaped insert for reducing noise and/or vibration caused by a first surface contacting a second surface, the insert having at least one upper body portion forming a top surface of the insert, one or more middle body portions, each body portion have a pair of ledges that extend along opposed front and rear surfaces of the insert, and a wedge-shaped tip, wherein the middle body portions are disposed between the upper portion and the tip. A generally wedge-shaped insert having a top surface, a wedge-shaped bottom portion, opposed front and back surfaces, and two opposed side surfaces.

An assembled body includes: a back door of a vehicle, the back door including an internal space; a subwoofer attached to the back door, a front face of the subwoofer being oriented to the outside of the back door, a back face of the subwoofer being oriented to an internal space side of the back door; and an exciter attached to the back door, the exciter generating an output for cancelling vibration of an installation spot due to the subwoofer.