107results about How to "Reduce noise emissions" patented technology

The present invention relates to a constructed shaft element, particularly a constructed camshaft for valve controlled internal combustion engines, wherein a hub body comprising at least one functional part, particularly at least one cam, is held on a shaft by a form fit connection by means of insertion teeth in the circumferential direction, wherein the insertion teeth comprise shaft teeth formed on the shaft and interacting with hub body teeth formed in a hub body recess. According to the invention, the at least one hub body (14) is held in addition to the circumferential form fit connection by a fixed seat on the shaft (12) implemented by a press fit between a tooth circle of the shaft teeth (22) and a root circle of the hub body teeth (26). The invention further relates to a method for producing a constructed camshaft for valve controlled internal combustion engines.

The present invention relates to a method of reducing the noise generated when an aircraft landing of flying device is spread, the method includes at least one part (7, 13, 21) of the landing device is coated with materials (8, 14, 22) whose density is lower than that of elements, thereby the part is suitable for the shape of air mechanics of flowing gaseous current around.

The invention provides a stall sensor for a wind turbine, a wind turbine comprising such a stall sensor and a method of operating such a wind turbine. The stall sensor comprises detector means (10) adapted to measure vibration of a rotor blade of the wind turbine and to output a vibration signal representative of the vibration of the rotor blade, conversion means (11) connected to the detector means (10) and adapted to determine a noise figure representative of a spectral signal content within a frequency band of the vibration signal received from the detector means (10) and arbiter means (12) connected to the conversion means (11) and adapted to signal a presence or an absence of stall based on the noise figure received from the conversion means (11).

The invention relates to a mixing unit (1) for mixing water with steam in a bypass station, wherein a plurality of Laval nozzles (5, 5a, 5b,...) are arranged in the mixing unit (1), which Laval nozzles (5, 5a, 5b,...) are displaced axially with respect to one another in a water steam direction, with the result that the noise emissions are reduced overall.

The invention relates to a method for operating a wind turbine (1). The wind turbine (1) comprises a rotor (4) with a number of wind turbine blades (5), wherein the rotors (4) axis of rotation (7) istilted in relation to the direction of the incoming wind (13). The method comprises the steps of determining the azimuth angle (A) of the blades (5) and adjusting the pitch angle of the blades (5) inaccordance with the azimuth angle (A) to ensure a substantially constant angle of attack (AoA) during at least a full rotation of the rotor (4). The invention further relates to a wind turbine (1) anduse of the method.

A rotor blade and a wind turbine is provided that has such a rotor blade, wherein the absolute length of the rotor blade extends from the blade attachment to the blade tip and the relative blade length proceeds from the blade attachment. The rotor blade is divided into an inner longitudinal section associated with the blade attachment and an outer longitudinal section associated with the blade tip, wherein the transition from the inner longitudinal section to the outer longitudinal section defines the cross-sectional plane E0, and the blade tip defines the cross-sectional plane EE. As a function of the relative blade length, the rotor blade has a specific aerodynamic profile with a chord t, a twist theta, a relative thickness d / t, a relative curvature f / t, and a relative trailing edge thickness h / t. In order to reduce acoustic emissions without having to accept appreciable losses in performance, it is proposed according to the invention that the cross-sectional plane E0 is located at a relative blade length in the range between 0.80 and 0.98, the blade chord of the aerodynamic profile in the cross-sectional plane EE is at least 60% of the blade chord t of the aerodynamic profile in the cross-sectional plane E0, and the blade twist of the aerodynamic profile in the cross-sectional plane EE is greater than the blade twist - of the aerodynamic profile in the cross-sectional plane E0.

An electric transformer comprising: a magnetic core; at least one coil assembly which is positioned around a portion of the magnetic core and comprises a plurality of windings; a structure adapted for applying a clamping force on the magnetic core and / or the windings; and a cooling circuit adapted for conveying cooling fluid directly inside the coil assembly.

A hybrid drive for a watercraft, including a primary drive motor, which is situated inside the watercraft and drives a drive shaft, and an above-water transmission, which is situated after the drive shaft and has a transmission housing, for driving a vertical shaft branching off from the above-water transmission, as well as an electric secondary drive motor, which has a stator and a rotor and is able to drive the vertical shaft in addition to or alternatively to the primary drive motor. The secondary drive motor can be embodied with a hollow shaft and the stator of this motor can be coupled in a torsionally rigid fashion to the transmission housing of the above-water transmission.