57 results about "Noise emission" patented technology

Systems and methods are provided for hysteretic mode boost voltage control for reduced broad spectrum noise emission.

The application provides an air-cooled steam pipeline drainage system, which effectively solves the problems of noise emission, high temperature radiation and white steam diffusion in the drainage process, and has a significant role in environmental protection and urban beautification. The system comprises a drainage device connecting and installing pipeline, a steam-water connecting pipe, a steam-water guide pipe, an air-cooled sleeve pipe and a heat dissipation sleeve pipe. The output end of the second pipeline is located at the lower end cavity of the air-cooled sleeve pipe, the upper part of the steam-water connecting pipe is fixedly provided with the steam-water guide pipe, the lower segment of the steam-water connecting pipe and the steam-water guide pipe is located in the upper cavity of the air-cooled sleeve pipe, the upper segment of the steam-water guide pipe is inserted into the lower cavity of the heat dissipation sleeve pipe, the upper end of the steam-water guide pipe is annularly provided with a plurality of height-directional arranged openings, and the inner wall of the upper cavity of the heat dissipation sleeve pipe is provided with a plurality of layers of fins.

The application relates to a local ventilator with a detachable sound-absorbing layer shell and relates to the technical field of ventilation and sound absorption, which comprises a spinning ventilator shell, a driving mechanism and a sound-absorbing mechanism, the driving mechanism and the sound-absorbing mechanism are arranged in the spinning ventilator shell, a local ventilator is formed, the local ventilator can be used for main ventilation of mine safety production, is suitable for large and medium-sized coal mines and non-coal mines, and can be used for tunneling roadway pressure ventilation, airflow noise between an impeller and the shell and interstage noise emission are avoided, ventilation and sound absorption functions of the local ventilator are realized, the driving mechanism and the sound-absorbing mechanism are arranged in the spinning ventilator shell respectively, the arrangement enables the driving mechanism to drive air flow to realize the ventilation function when the ventilator operates, the sound-absorbing mechanism can reduce noise generated in the operation process, the spinning ventilator shell provides support and protection for the whole ventilator, and the three are reasonably integrated together, and the problems of large noise and inconvenient maintenance of the existing ventilator are effectively solved.

The present disclosure relates to a positive displacement machine device (1) comprising a constant displacement machine (2) with a fixed displacement volume and a variable displacement machine (3) with an adjustable displacement volume, wherein in pump operation of the positive displacement machine device (1) a fluid (4) can be conveyed from an inlet (5) of the positive displacement machine device (1) to an outlet (6) of the positive displacement machine device (1) by means of the constant displacement machine (2) and / or the variable displacement machine (3), wherein in motor operation of the positive displacement machine device the constant displacement machine and / or the variable displacement machine can be driven by fluid flowing from the inlet to the outlet. Noise emissions of the displacement machine device (1) are reduced and / or the displacement machine device (1) can be operated at high speed by fluidically connecting the inlet (5) to a first port (21) of the constant displacement machine (2) and to a first port (31) of the variable displacement machine (3), and wherein the outlet (6) is fluidically connected to a second port (22) of the constant displacement machine (2) and to a second port (32) of the variable displacement machine (3).

The present invention relates to a method for reducing accidents involving horses (4) in road traffic, in which - a detection device (5) of a motor vehicle (1) detects an environment and thereby detects horses (4) and / or signs (10) indicating horses (4), - the detection device (5) generates a signal upon detecting a horse (4) and / or a sign (10) indicating a horse (4) and transmits it to a computer device (12) of the motor vehicle (1), - the computer device (12) upon receiving the signal issues a warning perceptible to at least one vehicle occupant (11) and / or reduces noise emissions from the motor vehicle (1). This significantly reduces the risk of accidents involving horses (4) in road traffic.

The invention relates to an electric machine (1) for driving a rail vehicle. The invention relates to a motor comprising a closed active arrangement (3) which is arranged in a housing (2) and has a stator (4) and a rotor (5). An external cooling path (6) is provided for conducting cooling air drawn in from the environment (U) outside the closed active arrangement (3), and an internal cooling path (7) is provided for conducting cooling air inside the closed active arrangement (3). The rotor (5) has a number (N) of magnetic poles (P), each of which is formed by two permanent magnets (11) arranged in a V-shape. The rotor (5) has, for each magnetic pole (P), at least one cooling hole (13) axially penetrating the rotor lamination stack (8), through which cooling hole the internal cooling path (7) passes. According to the invention, the ratio of the intermediate angle (WZ) to the polar angle (WP) is in the range of 0.2 to 0.4, the polar angle (WP) representing the angular range covered by the permanent magnets (11) of one magnetic pole (P), and the intermediate angle (WZ) representing the angular range extending between the polar angles (WP) of adjacent magnetic poles (P). Furthermore, the ratio of the hole angle (WL) to the polar angle (WP) is in the range of 0.925 to 1.075, where the hole angle (WL) represents the angular range covered by the two cooling holes (13). As a result, optimization of the electric machine (1) in terms of energy efficiency, noise emission, production costs and in particular cooling behavior is provided for the operating condition behavior of the rail vehicle.

A method operates a household refrigerator that has an ice maker that produces and / or dispenses ice in an ice production mode. The household refrigerator can at least partially deactivate a sub-process of the ice production mode in dependence upon a user-defined deactivation criterion. A first operating process is provided which when executed generates a first noise emission that is lower than that of the sub-process. A user-specific quiet time interval of the ice maker is provided as a deactivation criterion. At least the at least one sub-process of the ice production mode is deactivated at least partially during the quiet time interval. The operation of the household refrigerator is coordinated such that the first operating process is executed at least temporarily during the quiet time interval.

A gas turbine engine includes a fan, a core engine coupled to the fan, a fan case housing the fan and the core engine, and outlet guide vanes extending between the core engine and the fan case. The fan includes fan blades with leading edge protectors. The gas turbine engine further includes an acoustic spacing, which in combination with the fan blades having leading edge protectors effectively reduces noise emissions, enhances aerodynamic efficiency, and improves structural durability.

The utility model belongs to the technical field of computer cooling, and discloses a computer cooling and noise reduction device which comprises a case, an air inlet assembly is fixedly embedded in the lower end of one side of the case, an exhaust assembly is fixedly embedded in the upper end of the other side of the case, and the close ends of the air inlet assembly and the exhaust assembly are communicated with the interior of the case. The far ends of the air inlet assembly and the exhaust assembly communicate with the outside, and a driving assembly is installed in the machine box. The air inlet assembly and the exhaust assembly are the same in structure and are each composed of a sealing cover, an air exchange cavity, a ventilation groove, an inner one-way exhaust plate and an outer one-way exhaust plate, wherein the inner one-way exhaust plate and the outer one-way exhaust plate are clamped into the air exchange cavity in a sliding mode. Due to the arrangement of the air inlet assembly and the air exhaust assembly, the air inlet assembly and the air exhaust assembly can continuously exchange air in the case and external air under the cooperation of the driving assembly, and meanwhile, the case is always kept in a closed state, so that noise leakage is effectively reduced.

The utility model discloses a depressurization discharge silencing pipeline which comprises a pipe body, the pipe body is arranged to be a trumpet-shaped pipeline, and the trumpet-shaped pipeline is arranged to be gradually shrunk and then gradually expanded from one end of the pipe body to the other end of the pipe body. Through the design of the trumpet-shaped pipeline, fluid is gradually accelerated and then decelerated in the pipeline, sudden change of the flow speed is avoided, noise is effectively reduced, the noise elimination effect is improved, and high-pressure fluid is discharged at low noise.

A fluid heating system including a heat pump assembly and a storage tank is disclosed. The heat pump assembly may include a compressor. The storage tank may be configured to store the fluid to be heated. The compressor may be attached to the storage tank or sunk into the storage tank, to facilitate in the reduction of an overall system length / height and to reduce noise emission from the compressor.

A gas turbine engine includes a fan, a core engine coupled to the fan, a fan case housing the fan and the core engine, and outlet guide vanes extending between the core engine and the fan case. The fan includes fan blades with leading edge protectors. The gas turbine engine further includes an acoustic spacing, which in combination with the fan blades having leading edge protectors effectively reduces noise emissions, enhances aerodynamic efficiency, and improves structural durability.

The invention relates to a fan shroud and a fan arrangement having such a fan shroud, comprising: a frame (3) having a receptacle (4) in which a fan (2) is held; and a support arm (5) by means of which the receptacle (4) is fixed to the frame (3). In order to be able to reduce noise emissions, it is provided that the at least one support arm (5) has, in the region located between the frame (3) and the receptacle (4), a surrounding edge (8), which is formed by means of two support arm sections (6, 7), of a circumferentially closed passage opening (9).

A wind turbine blade (20) extending longitudinally in a spanwise direction between a root end (24) and a tip end (26) and in a chordwise direction between a leading edge (28) and a trailing edge (30) is disclosed. The wind turbine blade (20) comprises: a first opposing half-shell portion (34) and a second opposing half-shell portion (36) together defining an interior (38) of the wind turbine blade (20); at least one shear web (52) extending between the first opposing half-shell portion (34) and the second opposing half-shell portion (36). The wind turbine blade (20) further comprises at least one vibration damping device (60, 90, 122, 124, 126, 128, 132, 204, 224, 230, 250) for reducing noise emissions from the wind turbine blade (20). The at least one vibration damping device (60, 90, 122, 124, 126, 128, 132, 204, 224, 230, 250) includes at least one resonating member (62, 138, 202, 232, 260) extending from a surface of the wind turbine blade (20) to a distal end (70, 96, 156, 186, 206, 234, 262), the at least one resonating member being configured to oscillate to dissipate vibrational energy away from the surface of the wind turbine blade (20).

A propulsor fan array having reduced noise emission is disclosed. The propulsor fan array includes a plurality of propulsor fans that collectively generate thrust. Each of the propulsor fans include a blade fan having a plurality of blades. The plurality of blades are tensioned at tips of the plurality of blade fans such that a pitch of the blades during thrust generation is substantially the same as a pitch of the blades at rest. By tensioning the tips of the blades, an angle of the blades is maintained during operation of the propulsor fan thereby reducing noise that may result from changes in the angle of the blades.

The disclosure relates to an electrohydraulic drive system comprising an electric motor and a fluid pump that can be driven by the electric motor via an output shaft and has a rotor, which is rotatably guided in a stator surrounded by a housing of the electric motor, and a pump housing. A damping block is inserted between the electric motor housing and the pump housing in order to reduce noise emissions, said damping block being made of a metal material in a solid construction, and the output shaft passes through the damping block, said output shaft being guided in the damping block in a bearing point which is completely surrounded by the damping block and the bearing shell of which is directly supported against the damping block.

This invention provides a low-noise amorphous alloy three-dimensional transformer. The invention relates to the field of amorphous alloy transformer technology, and includes an internal noise reduction mechanism installed inside the transformer body and a second noise reduction component installed on the outside of the transformer body. The transformer body includes a housing, heat sinks, an oil tank, and a core module. The oil tank and core module are installed inside the housing, and the heat sinks are fixed to the outside of the housing. The internal noise reduction mechanism includes a buffer component, a first noise reduction component, a mounting component, and a barrier chamber. Through the coordinated use of the buffer component, the first noise reduction component, and the second noise reduction component, this solution establishes a three-level coordinated noise reduction system of "source vibration reduction, near-field isolation, and remote shielding." The vibration of the core module is directly absorbed by an air spring, and the double-layer structure of the barrier chamber and the outer protective cover achieves full-path blocking of solid-borne sound and airborne sound, ultimately meeting the most stringent quiet zone standards for noise emission.

The present invention relates to a fan framework (1) for a fan (2), which has a frame (3) with a mount (4) for the electric fan (2), and webs (5) connecting the mount (4) to the frame (3). To be able to reduce noise emissions, at least one of the webs (5) has a hole (9) encircled by a border (8) formed by two web segments (6, 7) in the space between the frame (3) and the mount (4).

The utility model belongs to the technical field of gas water heaters, and particularly relates to a noise reduction device and a gas water heater. According to the characteristic that noise is transmitted from the air inlet, the noise reduction device which is simple in structure, good in air circulation and remarkable in sound absorption effect is provided. Specifically, in view of the fact that the noise transmitted from the air inlet is mainly diffused outwards in the direction perpendicular to the air inlet, the applicant effectively blocks most of the noise transmitted in the directions by arranging the cover plate at the corresponding position of one side of the air inlet. Furthermore, an avoiding opening is formed in a specific position between the cover plate in the noise reduction cavity and the bottom shell, so that the smoothness of air circulation is ensured, noise sound waves propagating in other directions in the cavity can be reflected in the noise reduction cavity, the path of noise exhausted from the air inlet is prolonged, and the noise intensity is weakened. By means of the design, the efficient noise reduction effect is achieved while the ventilation efficiency is guaranteed, and optimal balance between noise reduction and ventilation is achieved.

The invention provides an underwater pier detection and restoration method and device based on a flexible tentacle, and the method comprises the steps: enabling a robot to carry out the autonomous navigation and environment perception, and enabling the robot to travel to a preset detection region; when approaching a target pier in the detection area, executing a bionic winding action through a flexible tentacle, and adaptively wrapping the target pier; performing optical scanning on the attaching area of the flexible tentacle, acquiring an original underwater image, and performing image processing on the original underwater image to determine a crack area; and performing grading evaluation according to the identified crack area, generating a decision instruction and performing crack repair. According to the invention, the energy consumption and noise emission are obviously reduced, the physical damage to the ecological community on the surface of the pier is reduced to the greatest extent, and the problem that the contradiction exists between the attachment stability and the low-disturbance demand of the existing ROV is solved.

A method for operating an HVAC system (1) is proposed, comprising at least the following steps: a) Operating the HVAC system (1) in different operating states, b) Recording operating noise emissions (15, 21) of the HVAC system (1) during the performance of step a), c) Detection of ambient sounds (16), d) Analyzing the operating noise emissions (15, 21) recorded in step b) and the ambient noise (16) recorded in step c), and e) Operating the HVAC system (1) depending on the result of the analysis in step d)._Furthermore, an HVAC system (1) and a computer program are proposed.

A propulsor fan and drive system having reduced noise emission is disclosed. The propulsor fan includes a blade fan having a plurality of blades. The blade fan is tensioned at the tips of the plurality of blades. By tensioning the tips of the blades, an angle of the blades is maintained during operation of the propulsor fan thereby reducing noise that may result from changes in the angle of the blades.

A gas turbine engine includes a fan, an engine core, a fan case housing the fan and the engine core, a plurality of outlet guide vanes extending between the engine core and the fan case, and an acoustic spacing. Relationships between acoustic spacing and a high-speed shaft rating allow for a gas turbine engine that reduces noise emissions while maintaining high performance.

A gas turbine engine includes a fan, an engine core, a fan case housing the fan and the engine core, a plurality of outlet guide vanes extending between the engine core and the fan case, and an acoustic spacing. Relationships between acoustic spacing and a high-speed shaft rating allow for a gas turbine engine that reduces noise emissions while maintaining high performance.

The present invention relates to a fan frame (1) for mounting a fan (2), comprising a frame (3) with a receptacle (4) in which the fan (2) is held, and struts (5) by means of which the receptacle (4) is fixed to the frame (3). In order to reduce noise emission, it is provided that at least one strut (5) in an area located between the frame (3) and the receptacle (4) has a surround (8) formed by two strut sections (6, 7) of a circumferentially closed passage opening (9).

The invention discloses a transformer substation noise on-line monitoring method, and relates to the technical field of environment monitoring and electric power facility management. The problems of poor timeliness, data isolation and incapability of early warning in the existing transformer substation noise online monitoring are solved. A plurality of monitoring points are arranged inside and on the boundary of a transformer substation, and each monitoring point is provided with a sensor array; acquiring noise data and meteorological data of the monitoring points and operation condition data of the main transformer of the substation; preprocessing the collected noise data, and extracting acoustic features and time-frequency features from the preprocessed noise data; in combination with the meteorological data and the operation condition data of the main transformer of the transformer substation, a pre-trained noise source identification and contribution degree analysis model is adopted to obtain noise source types and quantized values of all noise sources; in combination with a noise emission standard, carrying out noise standard exceeding risk assessment; and when the noise level of the noise standard exceeding risk assessment exceeds a preset threshold value, multi-level early warning information is generated, and an alarm is given. The method is suitable for transformer substation noise on-line monitoring.

The invention relates to a system for controlling a heating valve in a room of a building, comprising an electromechanical actuator (12) for adjusting the flow rate of the heating valve, at least one room climate sensor (21) for recording room climate data, an acoustic sensor (22) for recording ambient noise, and a control unit (14) for controlling the actuator (12), wherein the system has an evaluation unit (24) for evaluating sensor data, which is signal-connected to the acoustic sensor (22) for evaluating the recorded ambient noise, and wherein the control unit (14) is signal-connected to the evaluation unit (24) in order to control the actuator (12) depending on the ambient noise detected by the acoustic sensor (22).The invention is characterized in that the evaluation unit (24) comprises a data storage device (25) and is configured to determine specific noise signatures based on the detected ambient noise, to compare these with noise signatures stored in the data storage device (25), and to generate an evaluation signal that is associated with one of the following environmental conditions: a) an open window located in the room, in particular where the window is open to an outside environment, b) an open door located between two rooms, c) hydraulically induced noise emissions at the heating valve, and d) the insulation value range of a window located in the room. Furthermore, the invention relates to a control method.

The utility model relates to the technical field of gas turbine power generation, in particular to gas turbine combined cycle power generation low-noise emission equipment which comprises a sound absorption box body, a box door is hinged to one side of the sound absorption box body, and through holes are formed in the two faces of the sound absorption box body respectively. The silencing box body is arranged in the sound absorption box body, an air inlet is formed in one side of the silencing box body, an air outlet is formed in the other side of the silencing box body, and the air inlet and the air outlet are matched with the through holes in the two faces of the sound absorption box body respectively. Compared with the prior art, by arranging the silencing box body, the multistage serially-connected silencing cavities and the complex airflow path, stage-by-stage attenuation, disturbance and dissipation of sound waves are effectively achieved, linear propagation and high-frequency impact of noise are avoided, the noise reduction efficiency is improved, and the noise pollution risk of the system is reduced.

The invention relates to a bell housing (26) for fastening a wind gearbox (18) in a wind turbine (10), the bell housing (26) having a first fastening region (30) for fastening to a gearbox housing of the wind gearbox (18) and a second fastening region (32) axially spaced from the first fastening region (30) by an annular body (28), the annular body (28) has a second fastening region (32) for fastening to a nacelle shell of the wind turbine (10) and / or to a main shaft bearing supporting a wind rotor shaft (16) of a wind rotor (12) of the wind turbine (10), the annular body (28) having at least two differently designed recesses (34) for damping structural sound. Noise emissions can be reduced in a large number of wind turbines (10) of different designs due to asymmetry achieved in the bell housing itself (26) due to the recesses (34) of different designs.