135 results about "Noise emission" patented technology

A wind turbine blade (20) that extends 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) includes a first opposing half-shell portion (34) and a second opposing half-shell portion (36) which together define an interior (38) the wind turbine blade (20), and at least one shear web (52) that extends between the first opposing half-shell portion (34) and the second opposing half-shell portion (36). The wind turbine blade (20) further includes at least one vibration damping device (60, 90, 122, 124, 126, 128, 132, 204, 224, 230, 250) for reducing noise emission 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) that extends from a surface of the wind turbine blade (20) to a distal end (70, 96, 156, 186, 206, 234, 262) that is configured to oscillate to dissipate vibrational energy away from the surface of the wind turbine blade (20).

The invention provides a blade winglet control method and system for three-dimensional flow field analysis of a wind turbine blade, and relates to the technical field of intelligent control, and the method comprises the steps: solving a hydrodynamic equation through a numerical solution to generate three-dimensional speed, pressure and temperature distribution data of a blade surface; according to the speed, pressure and temperature data, the aerodynamic performance and the flow failure mode of the blade tip are recognized, so that the flow state of the blade area is obtained; the flow state of the blade area is analyzed to obtain geometric parameters of the winglet, and the geometric parameters comprise the length, the width, the installation angle and the shape; according to the geometric parameters of the winglets, the installation positions of the winglets are obtained, and the winglets comprise the pressure surface winglet and the suction surface winglet. According to the invention, the instability of airflow can be reduced, vortex and noise are reduced, noise emission during operation of the wind turbine is effectively reduced, and the environmental adaptability of the wind turbine is improved.

The invention discloses a power transformer sound level detection method and system, and relates to the technical field of power detection, and the system comprises a sound pressure level conversion unit, a background noise analysis unit, a transformer sound pressure level analysis unit and a sound power level calculation unit. Analyzing the sound pressure level of the transformer before operation and the sound pressure level of the transformer after operation measured by each wireless microphone so as to calculate the average A-weighted sound pressure level of the background noise of the power transformer; and the transformer sound pressure level analysis unit is used for analyzing the sound pressure level of each wireless sound measurement sensor and calculating the A-weighted sound power level of the power transformer in operation. Data support is provided for design and optimization of the transformer, and noise emission is reduced. The device replaces manual handheld sound level measurement equipment to approach the transformer, and the electric shock risk is effectively avoided; and the sound level can be quickly and accurately obtained through automatic calculation. The method is suitable for measuring the sound power levels of power transformers, reactors, prefabricated substations (box substations) and installed cooling equipment, operation is easy, convenient and efficient, and the process is safe and reliable.

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).

The invention relates to a method for diagnosing damage to a vehicle component generating airborne and / or structure-borne noise emissions, wherein data about these emissions are used for diagnosis, in which in a first method step (M1) - the measured airborne and / or structure-borne noise emissions are converted into airborne and / or structure-borne noise data, - at the same time, the current operating situation of the vehicle is determined by recording operating situation data, - and the detected data is stored in a computer, in which in a second method step (M2) - the airborne and / or structure-borne sound data is transformed using mathematical methods in such a way that the first transformed airborne and / or structure-borne sound data generated in this way can be analysed and evaluated, and in which in a third method step (M3) a normalisation process is carried out, - in which a reference data set associated with the current operating situation data is determined, which contains such transformed reference airborne and / or structure-borne noise data that would be formed in this operating situation for a vehicle without damage, - in which this reference data set is compared with the first transformed airborne and / or structure-borne sound data to generate normalised transformed airborne and / or structure-borne sound data, and - in which a detected difference gives an indication of airborne and / or structure-borne noise emitted by a defective vehicle component. The invention also relates to a diagnosis system, with which the method can be operated.

The invention relates to a method for operating a pneumatic braking device 1 for vehicles 2 with pneumatic brakes 4, which can be actuated by means of brake pressure P and are vented via an outlet valve 13. In order to reduce the noise emission of the vehicle with pneumatic brakes when bleeding the brakes, it is provided that a brake control unit 11 controls the outlet valve 13 according to a bleeding gradient EG, wherein the brake control unit 11, taking into account the current vehicle control commands 38, selects 26 from at least two operating modes 29, 30, 31 with different bleeding gradients EG1, EG2, EG3 and controls the outlet valve 13 in a normal operation 29 according to bleeding gradients EG1 which are optimized with regard to reduced noise emission during bleeding, and controls the outlet valve 13 in a rapid bleeding mode 30 according to bleeding gradients EG2 optimized for rapid bleeding.

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

Method for diagnosing damage to a vehicle component that generates airborne and / or structure-borne noise emissions, wherein data about these emissions are used for diagnosis, in which in a first method step (M1) - the measured airborne and / or structure-borne sound emissions are converted into airborne and / or structure-borne sound data, - simultaneously, the current operating situation of the vehicle is determined by recording operating situation data, - and the data obtained are stored in a computer, in which a second procedural step (M2) - the airborne and / or structure-borne sound data are transformed using mathematical methods in such a way that the first transformed airborne and / or structure-borne sound data generated in this way can be analyzed and evaluated, and in which a standardization process is carried out in a third procedural step (M3), - in which a reference data set is determined that is assigned to the current operating situation data and contains such transformed reference airborne and / or structure-borne sound data that would be generated in this operating situation in a vehicle without damage, - in which, for the purpose of generating normalized transformed airborne and / or structure-borne sound data, this reference data set is compared with the first transformed airborne and / or structure-borne sound data, and - where a detected difference provides an indication of airborne and / or structure-borne noise emitted by a defective vehicle component. Furthermore, the invention relates to a diagnostic system with which the method can be operated.

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.

A method for adjusting the noise emission configuration (15) of a plurality of wind turbines (3) is described, the method comprising: determining a total wind turbine related noise level (9, 13) at a plurality of locations (7); determining a critical location (7c) having a most critical, in particular a highest total wind turbine related noise level (9c) among the plurality of locations; if the most critical total wind turbine related noise level (9c) is above a noise threshold value (11c): reducing the noise emission configuration of the wind turbine (3b) having the highest noise power impact ratio.

The present invention relates to the field of geographic information monitoring technology, and relates to a geographic information monitoring system based on an intelligent mobile terminal, comprising a geographic data processing module, a noise area analysis module, a pollution source tracing analysis module and a noise pollution control module. The system collects urban geographic area data based on a GIS system embedded in the intelligent mobile terminal, performs data cleaning processing on the collected urban geographic area data, and then analyzes the total received noise value corresponding to each time period of a target building area, thereby screening out each noise pollution time period corresponding to the target building area, and tracing the noise pollution source of the target building area, thereby determining the type of noise source activity leading to the target building area, and further controlling the noise emission of the corresponding noise source in the target building area, thereby ensuring the implementation of effective management, ensuring the completeness of monitoring and evaluation of urban noise source tracing management, and the comprehensiveness of management measures, and improving technical innovation.

A hanging sonar depth-keeping starting device comprises a hollow thin-wall pressure-resistant outer cylinder, a cover plate is installed on the top face of the pressure-resistant outer cylinder through a fastener and a sealing piece, a hanging ring is installed on the top face of the pressure-resistant outer cylinder, and a bottom cover disengaging assembly is installed on the bottom face of the pressure-resistant outer cylinder through a fastener and a sealing piece; a lining cylinder is installed on the inner face of the pressure-resistant outer cylinder in a matched mode, a partition plate is arranged in the middle of the lining cylinder and divides the inner space into an upper layer and a lower layer, a plurality of battery packs and electronic tanks are arranged in the upper-layer inner space, and a driving cylinder, a sonar and an automatic contactor are arranged in the lower-layer inner space. Deep sea hoisting is carried out through a hoisting winch of a water surface ship or a deep sea submersible, the equipment does not work in the lowering process, multiple advantages of energy conservation, no sound production, no exposure of the position of the equipment and the like are achieved, meanwhile, high-pressure seawater is used as a power source to drive a piston to move, and automatic connection of positive and negative electrodes of sonar is completed; and the sonar can be automatically started to work after reaching the preset depth.

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 invention relates to a pump (10) comprising a pump housing. The pump housing comprises a housing section (12) made of a first material and a soundproof enclosure (11) made of a second material; wherein the second material has a higher noise reduction performance than the first material.

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 present invention relates to a dental handpiece for rotating a rotating dental tool. The dental handpiece consists of a housing with a handle and a turbine that can be operated by compressed gas or compressed air. The rotational movement of the turbine driven by compressed gas is transmitted to the dental tool via a rotor shaft and a chuck, and the rotor shaft is rotatably supported by at least one axial groove ball bearing. The radial stiffness required for operating the dental handpiece is achieved by axially preloading the ball bearing. The protrusions on the housing and the shaft disc of the at least one axial groove ball bearing allow the axial groove ball bearing to be used as a radial groove ball bearing. Compared with a dental handpiece with a radial groove ball bearing, the proposed dental handpiece design exhibits little power loss or friction loss, and in particular can practically completely prevent sliding and drilling friction components. Therefore, in addition to reducing noise emissions when the dental tool is driven, the service life of the dental handpiece can also be extended.

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.

The present invention provides an energy-saving air-cooled silent drainage device, which effectively solves the problems of noise emission, high temperature radiation, and white steam diffusion during the drainage process. The device comprises: a pipe assembly and an air-cooled drainage assembly; the pipe assembly and the air-cooled drainage assembly are connected through a drainage connecting pipe, and the drainage connecting pipe is connected to the air-cooled drainage assembly through a large-to-small joint; the air-cooled drainage assembly comprises a drainage pipe and a plurality of drainage chambers, and a terminal buffer chamber, the terminal of the drainage connecting pipe is connected to the drainage pipe, and a plurality of drainage chambers are arranged in sequence behind the drainage pipe, and the plurality of drainage chambers are arranged in sequence, and adjacent drainage chambers are separated by partitions, and a terminal buffer chamber is provided behind the terminal drainage chamber; the front drainage chamber is connected to the inner cavity of the adjacent rear drainage chamber through a pressure regulating pipe provided with an upward convexity, and the pressure regulating pipe is connected to the inner cavity of the adjacent rear drainage chamber through a connecting pipe provided with a bypass, and the lower outlet end of the connecting pipe is connected to the inner cavity of the adjacent rear drainage chamber.

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 invention discloses a drilling device for road engineering quality detection, and belongs to the technical field of engineering detection.The drilling device comprises a bottom plate used for supporting and fixing, a bearing part is installed on the bottom plate, a limiting frame is installed on the bearing part, a protection assembly is installed on the outer side wall of the limiting frame, and a drilling assembly is installed at the upper end of the protection assembly; a first regulation and control assembly and a second regulation and control assembly are installed on the bottom wall of the drilling assembly, a driving assembly is movably installed in the limiting frame and connected with the first regulation and control assembly and the second regulation and control assembly, a spraying assembly is further installed on the bottom plate, the upper end of the spraying assembly is connected with the drilling assembly, and the lower end of the spraying assembly is connected with the drilling assembly. The surrounding environment can be protected during drilling, meanwhile, noise emission can be reduced, the stability of equipment is improved through a water tank for fixing, when the equipment is not used, a drill rod is stored in a protection piece, an opening and closing door in a fourth through hole in the bottom wall of a bottom plate is in a closed state, and the drill rod is conveniently protected.

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 invention relates to an air-water heat pump series, comprising several product classes classified according to their energy efficiency and / or noise emission, each containing air-water heat pumps of a graduated housing size and a graduated nominal heating output, wherein a first air-water heat pump with a first of the graduated housing sizes and a first heat exchanger of a first heat exchanger size in a first of the product classes provides a first nominal heating output and the first heat pump with the first housing size and the first heat exchanger in a second of the product classes provides a second nominal heating output different from the first nominal heating output, wherein the first heat pump in the first and second product classes each has a heat exchanger with the same dimensions.

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.