34results about How to "Acoustic emission reduction" patented technology

An air handling blower for HVAC equipment includes a blower housing adapted to accommodate centrifugal impellers of selected inside and outside diameters of the impeller blades wherein the inside diameter of the largest diameter impeller accommodated by the housing is not less than the outside diameter of the smallest diameter impeller accommodated by the housing without loss of performance. The blower housing preferably has a continuously increasing cross-sectional airflow area for air being discharged from the blower and extending from a cutoff edge to an outlet.

A filter housing includes an inlet for receiving an airflow, a cavity for receiving a filter and an airflow passage between the inlet and the cavity. At least one vane, positioned in the airflow passage, partitions the airflow passage into a plurality of ducts. The vanes lie adjacent to, or contact, the upstream surface of the filter such that each duct communicates with a separate portion of the upstream surface of the filter. The airflow passage extends in a direction which is inclined to the upstream surface of the filter. The vanes help to distribute the flow of air more evenly across the surface of the filter and also help to reduce acoustic emissions from the machine of which the filter housing forms a part.

A method of operating a wind turbine generator having at least one wind turbine blade includes increasing a pitch angle of the at least one wind turbine blade as the at least one wind turbine blade rotates through a first range of blade azimuth values. Such increasing of the pitch angle reduces acoustic emissions generated by the wind turbine generator. The method also includes decreasing the pitch angle of the at least one wind turbine blade as the at least one wind turbine blade rotates through a second range of blade azimuth values. Such decreasing of the pitch angle increases electric power generated by the wind turbine generator.

In a method for operating an internal combustion engine (10) equipped with a piston pump as a high-pressure pump (18), which is driven by a drive shaft (28) of the engine (10), in which the high-pressure pump (18) delivers fuel from a low-pressure region (16) to a high-pressure side (38) and a quantity control valve (44) sets the quantity of fuel delivered by the high-pressure pump (18), the acoustic emission of the high-pressure pump is reduced by virtue of the fact that the high-pressure pump (18) functions in a two-point operation, alternating between full delivery for individual or successive piston strokes and idle delivery for individual or successive piston strokes and, when the pressure falls below a lower pressure threshold, the full delivery is activated until an upper pressure threshold is reached.

The invention relates to a device for comminuting all types of parts, in particular plastics, preferably hollow plastic bodies, such as for example plastic bottles. Said device comprises a feeding device (1), and a comminuting unit (2), the feeding device having at least one transport unit (3) and the comminuting unit (2) having a rotor (4), which is provided with tools and rotates in a housing (5). The device is characterised in that the transport unit (3) transports the parts at an angle of between 45 DEG and 90 DEG to the rotor axis (7), at least in the region lying directly in front of the rotor (4).

The invention relates to an electrical machine (1) comprising a first active part (2) and a second active part (3), both the first active part (2) and the second active part (3) having a plurality oflaminated sub-cores (5) and each laminated sub-core (5) having a plurality of individual laminations (6), each comprising an axial width (b). The laminated sub-cores (5) are mutually spaced in an axial direction (a) such that a respective radial cooling slot (7, 8', 8'') is formed between two adjacent laminated sub-cores (5). The radial cooling slots (7) in the first active part (2) are offset inthe axial direction (a) in relation to one another in comparison to the radial cooling slots (8', 8'') in the second active part (3), and the sum of the axial widths (b) of all individual laminations(6) in the first active part (2) corresponds to the sum of the axial widths (b) of all individual laminations (6) in the second active part (3).

A tomography apparatus has an annular channel and at least one ventilation element for the purpose of drawing off an air current flowing through the annular channel. The ventilation element contains an intake window that is located in the annular channel for the purpose of drawing off at least a portion of the air current. In order to obtain an even flow profile at an output window of the ventilation element, the intake window has a greater effective intake cross-section at both sides than at the middle. By such evening the flow profile at the output window, turbulence and air current interruptions of the air can be generally avoided, such that when operating the tomography apparatus, disrupting acoustic emissions may be reduced, or a higher air flow and thereby a greater cooling effect may be obtained.

An integrated mass air flow sensor / broadband silencer assembly comprises a molded body having a plurality of walls formed therein. The molded body is over-wrapped with a layer of acoustic foam that, together with the plurality of walls, define a plurality of chambers within an interior volume of the assembly. A mass air flow sensor can be inserted into one of the chambers. The chambers are sized and spaced to provide a uniform velocity, low turbulence air flow to the sensor, and a minimally-restricted air flow to an internal combustion engine located downstream of the assembly.

A method is proposed for operating a wind turbine, including the following steps: deriving at least one turbulence characteristic of atmosphere hitting the wind turbine, determining at least one wind turbine specific parameter based on the at least one derived turbulence characteristic, and operating the wind turbine according to the at least one determined turbine specific parameter is provided. Further, a wind turbine and a device as well as a computer program product and a computer readable medium are also provided.

In a jet engine having a plug nozzle and a plug extending rearwardly from the nozzle exit, the improvement comprising a plug having successive cross sections spaced apart rearwardly of the nozzle exit, the cross sections transitioning from circular or near circular at the exit plane defined at the nozzle exit, to progressively non-circular, rearwardly.

In a floor panel structure of a vehicle body in which a floor of an automotive vehicle is formed by a floor panel coupled to a plurality of frame members extending in substantially longitudinal and width directions of the vehicle, there are provided a panel area formed by being enclosed at least by the frame members, a heavy-weight area located at a substantially central portion of the panel area, and a peripheral area located substantially around the heavy-weight area, wherein the heavy-weight area is configured so as to be heavier than the peripheral area. Accordingly, the vibration energy transmitted from the frame members to the floor panel can be reduced and thereby the acoustic emission generated from the floor panel can be reduced.

Toothed belt comprising a body, a plurality of resistant inserts or cords and a plurality of teeth extending from at least one surface of the body; the teeth are coated with a coating fabric. The body is made of a first elastomeric material formed. The fabric is treated with a fabric treatment comprising a second elastomeric material. The resistant inserts or cords are treated with cord treatment comprising a third elastomeric material. The first, second and third elastomeric material are formed of a mixture of one or more copolymers obtained from diene monomers and monomers containing nitrile groups, in which the nitrile groups are between 30 wt % and 39 wt %.

The invention relates to a facility (2), in particular a power plant (2), comprising a steam turbine (8) and a bypass station (10) for diverting a working medium, as required, for the steam turbine (8) around the steam turbine (8), wherein at least one resonance absorber (20) is provided for the bypass station (10).

Device for comminuting all types of parts, especially plastics, preferably hollow plastic bodies such as plastic bottles. The device comprises feed device (1), comminuting unit (2). The feed unit has a transport unit (3) and the comminuting unit has a rotor (4) rotating in a housing (5) and fitted with tools. The transport unit transports the parts at an angle of 45 to 90 deg to the rotor axis at least in the region directly in front of the rotor.

A household appliance (5), in particular used as a water-operated household appliance (5), comprising a housing (4'), wherein the housing (4') has at least one housing wall with an embossed pattern (3) (4). Here, the pressing pattern (3) is based on Penrose tiling (3').

A noise reducing wind turbine blade is disclosed. The wind turbine blade includes a blade body having a leading edge, a trailing edge, a suction side, and a pressure side. The wind turbine blade further includes a noise reducer disposed on a portion of the blade body extending partially upstream from the trailing edge for modifying airflow over the blade body effective to reduce acoustic emission.