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 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.