A cooling air introduction path is formed in a base of a sound proof case of an engine-driven work machine. The base is divided into upper and lower portions, and a space in the upper portion is divided by a separation wall and arranged below an air discharging chamber. The upper part of one space is covered with a arranging plate, a partition wall is erected on the arranging plate, and a cooling air introduction port is provided between the partition wall and the separation wall to provide an engine chamber and one space are communicated, a hole is provided in the plate below the chamber, and one space and the space in the lower portion are communicated and located below the chamber. A cooling air intake port is provided on lateral walls of the lower portion to communicate the space inside the lower portion with the outside of the machine.

Disclosed is a fully enclosing engine or unit capsule of a motor vehicle with an air cushion foil, whereby the acoustic component properties can be significantly influenced, tuned.

Disclosed is a fully enclosing engine or unit capsule of a motor vehicle with an air cushion foil, whereby the acoustic component properties can be significantly influenced, tuned.

A noise suppressor is removably installed in power generator equipment including an enclosure and a power generator unit. The enclosure includes at least one of an air intake port and an air discharge port that are vents. The power generator unit is covered with the enclosure. The noise suppressor includes a tubular member having a first opening that opens to a direction different from the vent and a second opening that opens to the vent, forming a channel for gas leading from the first opening to the second opening, and provided with an acoustic liner inside the channel. The tubular member has such a shape that the channel bends at a plurality of points.

A cover for integrated power electronics (IPE), the cover including a first sheet, a second sheet bonded to the first sheet by at least one joining point in a perimeter region, a cavity defined between the bonded first sheet and second sheet, wherein the perimeter region seals the cavity, and a filler material disposed within the cavity.

A cover for integrated power electronics (IPE), the cover including a first sheet, a second sheet bonded to the first sheet by at least one joining point in a perimeter region, a cavity defined between the bonded first sheet and second sheet, wherein the perimeter region seals the cavity, and a filler material disposed within the cavity.

The invention relates to a vibration elimination system, comprising a shielding plate (2) for a motor component, at least one vibration elimination element (10) that is fastened to the shielding plate (2), wherein each vibration damping element (10) comprises a spring-mass system that is capable of vibration, the spring force and mass of which are dimensioned such that said spring-mass system is matched to a predetermined vibration frequency of the shielding plate (2).

The invention relates to a vibration elimination system, comprising a shielding plate (2) for a motor component, at least one vibration elimination element (10) that is fastened to the shielding plate (2), wherein each vibration damping element (10) comprises a spring-mass system that is capable of vibration, the spring force and mass of which are dimensioned such that said spring-mass system is matched to a predetermined vibration frequency of the shielding plate (2).

An apparatus for controlling engine noise reflecting engine vibration and driving conditions includes a sound generator that generates reinforcement noise in order to reinforce non-linear engine noise. The apparatus includes a vibration sensor measuring engine vibration as a noise source of the engine, a signal processing controller receiving the signal of the vibration sensor in real time and controlling the sound generator so that the engine noise may maintain linearity, and an amplifier receiving and then amplifying a control signal of the signal processing controller to transfer the amplified control signal to the sound generator.

An apparatus for controlling engine noise reflecting engine vibration and driving conditions includes a sound generator that generates reinforcement noise in order to reinforce non-linear engine noise. The apparatus includes a vibration sensor measuring engine vibration as a noise source of the engine, a signal processing controller receiving the signal of the vibration sensor in real time and controlling the sound generator so that the engine noise may maintain linearity, and an amplifier receiving and then amplifying a control signal of the signal processing controller to transfer the amplified control signal to the sound generator.