77 results about "Noise emission" patented technology

The invention relates to a method (1) for adapting a noise emission (2) of a motor vehicle (3). The method (1) comprises the steps of determining (S1) noise protection information (4) with regard to an environment (5) of the motor vehicle (3), and adapting (S2) an operating strategy of at least one auxiliary unit (6) of the motor vehicle (3) depending on the determined noise protection information (4). To adapt the operating strategy, the at least one auxiliary unit (6) can be operated optionally in a first, preferably energetically optimal, operating mode or a second operating mode with reduced noise emission (2).

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

A noise emission reduction system includes a solenoid couplable to a shielding member, and to a frame of a vehicle. The solenoid is controllable to induce vibration of the shielding member in relation to the frame of the vehicle. A microphone is configured to receive sound emitted by a noise source. An accelerometer is couplable to the frame and a controller is coupled to the solenoid, to the microphone, and to the accelerometer. The controller is configured to: receive a first signal from the accelerometer; receive a second signal from the microphone; determine a control signal for the solenoid based on the first signal and the second signal; and control the solenoid using the determined control signal to induce vibration of the shielding member in relation to the frame.

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.

A noise damper for compressed air systems, in particular for brake systems of utility vehicles, including at least one fibre mesh roll unit having at least two mesh density regions, at least one inlet, at least one outlet, and a housing, in which the at least one fibre mesh roll unit is accommodated within the housing of the noise damper to dampen noise emissions of air flowing through from the at least one inlet to the at least one outlet. Also described is a method for producing a fibre mesh roll unit for a noise damper for compressed air systems, in particular for brake systems of utility vehicles.

A gas turbine engine comprises a fan, a core turbine engine coupled to the fan, a fan case housing the fan and the core turbine engine, a plurality of outlet guide vanes extending between the core turbine engine 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 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.

An example computing device includes a non-transitory machine-readable storage medium encoded with instructions and a processor to execute the instructions. The instructions are executable to detect a hardware configuration of the computing device by identifying hardware components within the computing device and determine an expected acoustic noise emission of the computing device based on the hardware configuration. The instructions are also executable to select a default operating mode of the computing device based on the hardware configuration and set the computing device to the default operating mode.

The present invention relates to the technical field of acoustic emission signal feature analysis, and aims to solve the problem of feature extraction and analysis of high-noise emission signals. The present invention provides an acoustic emission signal feature analysis method for rotating machinery state monitoring, comprising: using data of rotating equipment after maintenance as benchmark data, calculating features of the benchmark data; calculating a threshold value of the benchmark feature, calculating features of normal operating data, obtaining a mean and a standard deviation of the feature, and using a threshold value exceeding K times the mean as a feature abnormality; during real-time monitoring, adopting a periodic triggering acquisition method, each time acquiring acoustic emission data of N seconds in length, and calculating corresponding feature indicators, while simultaneously storing S*N seconds of cached data in a cache queue; comparing the real-time feature indicator with the benchmark feature indicator threshold value, and if the feature indicator exceeds the threshold value, further clarifying the reason why the acoustic emission signal exceeds the threshold value, and simultaneously storing the cached original data in the form of a file; and if the feature indicator does not exceed the threshold value, only storing the real-time feature in a database.

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.

A vehicle device is proposed comprising a sound sensor unit (12), arranged in particular in the area of ​​a vehicle wheel (10), for detecting a sound emission (18) of the vehicle wheel (10), a sound transmitter unit (14), arranged in particular in the area of ​​the vehicle wheel (10), and a computing unit (16) operatively connected to the sound sensor unit (12) and the sound transmitter unit (14), which is intended to determine a detection signal of the sound sensor unit (12) correlated with the sound emission (18) of the vehicle wheel (10) and to control the sound transmitter unit (14) at least as a function of the detection signal in such a way that a noise emission (20) generated by the vehicle wheel (10) is reduced and / or masked.

The invention relates to a method for determining the expected noise emissions of a gear pair, in which method the tooth flanks of a gear of the pair are measured and, from the measurement data thereby obtained, the deviation of the measured tooth flank surfaces from a predefined target profile of this surface is determined, and in which method, on the basis of this deviation, a simulation in the form of a contact analysis under load is carried out for the gear pair, wherein the contact analysis is based not on the deviation as a whole but rather on only a portion of the deviation specifically selected in the complementary space.

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 application relates to the technical field of road noise prediction, and discloses a road traffic noise prediction method based on a cellular transmission model, which comprises the following steps: dividing a road into cells, and homogenizing vehicles in the same cell; constructing a motion characteristic data prediction model according to the number of vehicle exchanges of adjacent cells and the average speed of vehicles in the cells; calculating motion characteristic data of vehicles in the cells at the next moment according to the characteristic data prediction model, wherein the motion characteristic data comprises the number of vehicles in the cells, the average speed of the vehicles and the acceleration of the vehicles; obtaining noise data of each cell at a standard distance according to the motion characteristic data and a motor vehicle noise emission model; performing distance attenuation on the noise data of the cells at an effective distance; superimposing vehicle noises in the form of cells to obtain noise values of the cells; and realizing road scale traffic noise prediction, which can effectively solve the problem of prediction accuracy while taking into account the scale of road traffic noise research.

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 utility model discloses an oil separator and a refrigerating unit, the oil separator comprises: a housing, the inner cavity of which is divided into a silencing section with an air inlet and an oil subsection with an air outlet; the inner shell is installed on the silencing section, silencing holes are distributed in the side wall of the inner shell, the inlet end of the inner shell communicates with the air inlet, and the outlet end of the inner shell communicates with the oil section; and the separation assembly is installed above the oil channel of the oil section, the separation assembly comprises a first baffle right facing the outlet end of the inner shell and a second baffle arranged between the air outlet and the first baffle in a separated mode, the area between the first baffle and the second baffle is a first filtering flow channel, and the area between the second baffle and the air outlet is a second filtering flow channel. The oil separator provided by the utility model integrates oil separation and noise reduction functions, and realizes high-efficiency oil separation and low-noise emission by optimizing the internal structure of the oil separator.

A gas turbine engine comprises a fan, a core turbine engine coupled to the fan, a fan case housing the fan and the core turbine engine, a plurality of outlet guide vanes extending between the core turbine engine and the fan case, and an acoustic spacing. Acoustic spacing comprises a distance between the fan and the plurality of outlet guide vanes, and in combination with the use of airfoils with leading edge protectors for both various stages of blades and vanes, the engine effectively reduces noise emissions, enhances aerodynamic efficiency, and improves structural durability.