55results about How to "Reduce structure noise" patented technology

The invention discloses a plastic shell motor, which comprises a stator assembly (1), a rotor assembly (2), a control circuit board (3), bearings (4), a rotating shaft (5), a front end cover (6) and a rear end cover (7), wherein the front end cover (6) and the rear end cover (7) are assembled together to form a plurality of accommodating cavities; a bearing cavity (61) is formed at the top of the front end cover (6); a stator accommodating cavity (62) is formed below the bearing cavity (61) of the front end cover (6); a circuit board accommodating cavity (72) is formed below the stator accommodating cavity (62) and inside the rear end cover (7); a bearing cavity (71) is formed below the circuit board accommodating cavity (72) and at the bottom of the rear end cover (7); the bearings (4) are arranged inside the bearing cavities (61, 71); the stator assembly (1) is nested inside the stator accommodating cavity (62); and the control circuit board (3) is arranged inside the circuit board accommodating cavity (72). The plastic shell motor has the advantages of good reclaimable property, environmental protection, strong universality, convenient and reliable assembly and the like, and is suitable for a single-phase brushless motor and a three-phase brushless motor.

A motor includes a rotor portion including a shaft and a rotor magnet rotatable about a center axis, an armature arranged opposite to the rotor magnet to generate a torque therebetween, a circuit board arranged below the armature in an axial direction substantially parallel to the center axis and including a control circuit controlling rotation of the rotor portion, and a base portion including a bearing holder which supports the armature on its outer side surface and the shaft on its inner side surface via a bearing member. The armature is pressed against the bearing holder in the axial direction with an elastic member.

The invention discloses an active control noise reduction method and system for interior noise of an automobile. The system comprises a vehicle information identification system, an interior environment monitoring system, a vehicle vibration collecting system and an active control system. By utilizing an active control method, the disturbance of structural noise caused by engine excitation and road excitation to interior passengers is effectively reduced, the interior sound quality of the automobile is greatly improved, and more comfortable riding environment is provided for the passengers.

A torque transmission device (910) for low vibration transmission of torque via at least one shaft, with: a drive element (912), and a driven element (914) connected to the drive element (912), with at least one damper arranged between the drive element (912) and the driven element (914) which connects the drive element (912) and the driven element (914) in such a way that they can twist in relation to one another, with the damper having staged, progressive characteristics, with an increase in the relative rotation between the drive element (912) and the driving element (914).

The invention belongs to the technical field of steel bar hoop bending equipment, and particularly relates to a hoop bending machine. The hoop bending machine comprises a machine frame. The machine frame is provided with a drawing mechanism, two straightening mechanisms, a bending mechanism and a shearing mechanism. The straightening mechanisms comprise the front-back straightening mechanism and the top-bottom straightening mechanism, the front-back straightening mechanism and the top-bottom straightening mechanism are arranged on the two sides of the drawing mechanism respectively, and a pay-off rack is arranged in front of the front-back straightening mechanism. The drawing mechanism comprises a pressing wheel set, a drawing wheel set and supports, wherein the pressing wheel set and the drawing wheel set are arranged in parallel in the vertical direction in a matched mode, the end, where a driving drawing wheel of the drawing wheel set is located, of a drawing input shaft is connected with a synchronous belt drive mechanism, and a pressing mechanism is arranged corresponding to each pressing wheel. The bending mechanism comprises a case, a main shaft and a bending shaft, the main shaft is arranged in the case and connected to the synchronous belt drive mechanism, a central shaft is installed at one end of the main shaft, a bending sleeve is arranged between the main shaft and the case in a sleeving mode, and the bending shaft is arranged on the side, close to the central shaft, of the bending sleeve. The hoop bending machine is high in automation degree, high in response speed of high speed start and stop and forward and reverse rotation, short in machining cycle and low in cost.

The invention relates to a low-frequency, vibration isolation and shakeproof skid bed for vibration isolation, shakeproof, buffering, impact resistance and structural noise reduction in shipping, vehicle, building, bridge, engineering machinery and various electromechanical appliances and engineering facilities. The invention is characterized in that a spiral elastomer made of a plurality of stainless steel twisted wires in a symmetrical or antisymmetric structure mode, a multidirectional elastic position-limit mechanism, a metal structural member, an angle switching rack and a mounting base are connected into a whole by screw threads, which has the properties of multidirectional nonlinear softened rigidity and dry damping and the function of displacement limitation. The low-frequency, vibration isolation and shakeproof skid bed is suitable for the control of large energy input (such as earthquakes, explosion impact, ocean wave, large low-frequency displacement interference, etc) in any direction, meets the needs of multidirectional low-frequency vibration isolation, buffering, shakeproof and large displacement dynamic stability in engineering and has a safe and reliable structure, long life-span, strong adaptive capacity to environment and low maintenance cost.

The invention provides a rotor processing method capable of reducing motor vibration and noise. The processing method is characterized by including step one, performing coarse grinding on a bearing retainer of a motor and an external circle of an iron core; step two, performing a first dynamic balance correction; step three, performing a second fine grinding on the rotor; and step four, performing a second dynamic balance correction. Grinding and dynamic balance correction are performed twice for the rotor processing, compared with grinding and dynamic balance correction which are performed once, the motor vibration severity is improved by at least one standard grade, structural noise is reduced by 3-5dB, different motors have different specific circumstances, air noise is reduced due to reduction of the vibration severity and the structural noise, and therefore vibration and noise reduction effects are obvious.

The invention relates to a method for detecting and characterizing defects in a heterogenous material via ultrasound. Said method includes the following steps: —emitting ultrasound waves from an emitting ultrasound transducer placed against the material; —acquiring, by means of a receiving ultrasound transducer in various positions relative to said material, a plurality of time signals, representing the amplitude of the sound propagated in the material as a function of time, for a position of the receiving ultrasound transducers, —determining a time function representing a spatially averaged power of the time signals that correspond to different positions of the receiving transducer; and —normalizing the time signals by means of said time function so a to obtain normalized time signals. The defects in the material are detected from said normalized time signal.

The invention discloses a compressor base-angle, which comprises the following parts: edge on triangle base angle, support angle, hollow part in the middle of base angle and around inter edge, base face between hollow part and each support angle. The invention increases the gap between base angle and compressor after welding the compressor base cover and base angle, which reduces the structure noise and affirms the centring due to removing part of base face in the base angle.

The invention discloses a transformer structure of a microwave oven, comprising an iron core, a coil, an insulating strip, an incoming end, an output end and a fixed plate. A silicon steel disc positioned outmost the two ends of the iron core is provided with an anti-magnetic plate, the anti-magnetic plate is vertical to the silicon steel disc and erected at the two sides of the silicon steel disc to block a magnetic force line generated by magnetic leakage of the coil protruded on the iron core part. Therefore, the invention blocks electromagnet excitation of the microwave oven shell from a magnetic field generated by the magnet leakage of a coil winding terminal, avoids causing the microwave oven shell to resonate and reduces the noise of the integral structure during operation of the microwave oven. Besides, the anti-magnetic plate arranged on the silicon steel plate also increases the integral radiation area of the transformer, thereby the invention is more beneficial to ventilation and radiation of the transformer, effectively reduce the temperature of the transformer during the operation of the microwave oven and improve the radiation efficiency of the transformer.

A fan unit has a fan (10). Associated with the fan is an air-guiding tube (22) through which the fan (10) transports air, during operation. The air-guiding tube (22) is connected to at least one carrier tube (23) for suspension of the fan (10). The fan includes a carrier part (25). A damping member (30) is arranged between the carrier part (25) and the carrier tube (23) to reduce any structure-borne sound which occurs during operation of the fan (10).

The invention discloses a molecule hybridization noise reduction material and its fabrication method, which comprises the following ingredients with different weight shares: base material of 15 to 30 weight shares; filler of 30 to 55 weight shares; biological contact agent of 1 to 3 weight shares; pigment of 0.01 to 0.05 weight shares; water of 5 to 15 weight shares. The preparation method of the material: mix the filler, contact agent and pigment to acquire filler mixture; mix and agitate the base material, a colloid, a crosslinking agent, a plasticizer, a stabilizer and water as 80 rounds/minute to acquire cementation material; agitate the mixture and the cementation material and then vibrate and filter them to get the material. The material, which has excellent light, heat and pH stability and prevents ageing; excellent noise reduction effect, can reduce the noise averagely by 10 to 50 dB in average; safe, which does no harm to human body; convenient for engineering.

The invention discloses a brushless AC smoke ventilator motor. The brushless AC smoke ventilator motor comprises a rotor, a stator, a casing and a control circuit, wherein the rotor comprises a rotor core, a rotating shaft arranged in the middle of the rotor core, a magnetic steel tightly clinging to the outer ring of the rotor core, and a plastic cage arranged at the outer ring of the magnetic steel, the stator comprises a stator core and an insulation plastic sleeve, each tooth of the stator core is wound with an enamelled wire, the casing comprises a plastic packaging body and an end cover, the control circuit comprises a power source conversion module, and a signal control module and a PWM AC driving module which are connected with the power source conversion module, and an output end of the PWM AC driving module is connected with the enamelled wires. The brushless AC smoke ventilator motor employs an AC power source to directly drive an operation motor, further has properties of stable start and operation, low noise, small vibration, simple and firm structure, high efficiency and energy-saving performance, makes efficiency reaching 75-82%, has energy-saving efficiency 64-67% higher than that of a single phase AC capacitance operation motor.

The invention discloses a spring curtain lifting and collecting mechanism which comprises a bottom frame, a servo motor, a first coupler, a collecting box and a fixing block, the servo motor is installed on the outer wall of one side of the bottom frame, a rotating shaft is installed at the output end of the servo motor, and the first coupler is installed at one end of the rotating shaft; fixing blocks are mounted on the two sides of the top of the bottom frame; and two sets of collecting boxes arranged side by side are installed on the back face of the bottom frame, a curtain collecting roller is installed on the outer wall of one side of one set of collecting boxes in a penetrating mode, two sets of steel rope collectors arranged side by side are installed on the outer surface of the curtain collecting roller, and steel rope guide mechanisms are installed on the inner walls of one sides of the two sets of collecting boxes. According to the invention, a group of motors are adopted for control, the difficulty in control can be reduced, the opening force of the curtain sheets can be controlled to a certain extent through the springs, the curtain dust removal operation can be carried out in the opening process of the curtain, and a part for dust removal is clamped and connected with the combined frame body, so that the detachable performance is realized.

To reduce structure noise, input data representing an input structure is obtained and boundary conditions are set by classifying data of each of multiple structure elements of the input data as a signal component or a noise component. A smoothing operation is performed with respect to the input data and based on the boundary conditions. Output data representing an output structure is provided by reducing noise from the input structure.

The invention discloses a novel automobile exhaust system hanging block. The exhaust system hanging block comprises a metal support connected with an automobile body, a metal framework fixedly connected with the metal support, and an exhaust tube mounting part, wherein the metal framework is positioned around the outer side of the exhaust tube mounting part which is fixedly connected with the metal framework through a plurality of rubber reinforcing ribs; and a vulcanized rubber body is packed in the metal framework and is connected with the metal framework to form a whole. By adopting the technical scheme, the problem of limiting a silencer by the hanging block is solved, the displacement of a rear silencer can be in an acceptable range when an automobile runs, the durability of the hanging block can be improved, and a mounting tolerance of an exhaust system can be effectively corrected; the metal support of the hanging block which is tightly adhered to the automobile body has high rigidity, so that the vibration of a silencer side can be effectively prevented from being transferred to an automobile body side, noise transmitted to the inside of the automobile body by the exhaust system is reduced, and high noise vibration and harshness (NVH) performance is achieved; and the exhaust system hanging block is convenient to mount, a limited space is effectively utilized, and a hanging system is convenient to arrange.

The invention discloses a vibration and noise reduction structure for a generator assembly, the generator assembly and a generator. A vibration and noise reduction ring vertical to the outer wall is arranged on the outer wall of a thin-walled cylinder of a generator rotor or stator; the axial direction of the vibration and noise reduction ring is consistent with that of the thin-walled cylinder; and the vibration and noise reduction ring can comprise a main ring and an auxiliary ring, which are arranged in parallel to inhibit high-frequency vibration. According to a petal-shaped vibration mode of a thin-walled structure of a direct-driven wind turbine generator set, the vibration and noise reduction ring is arranged on the outer wall of the structure; the petal-shaped radial vibration mode is eliminated; radial vibration is effectively inhibited; structural noise is reduced; and the vibration and noise reduction structure is applicable to the wind turbine generator set.

The invention discloses a camera telescopic device. The camera telescopic device comprises a camera supporting piece used for arranging a camera; a direct-current motor used for outputting rotary motion; a transmission mechanism used for converting rotary motion into telescopic motion of the camera supporting piece; a controller connected with the direct-current motor and used for acquiring reversing current pulse signals of the direct-current motor and determining the actual rotating angle of the direct-current motor according to the number of the reversing current pulse signals; and determining the actual telescopic position of the camera supporting piece according to the actual rotating angle, and controlling the direct current motor to stop rotating when the actual rotating angle is equal to the theoretical rotating angle of the corresponding direct current motor when the camera supporting piece stretches to the preset position. The camera telescopic device can track the actual position of the direct-current motor, and the actual telescopic position of the camera supporting piece can be determined conveniently. The invention further discloses a control method applied to the camera telescopic device and an electronic product comprising the camera telescopic device.

A composite material, especially for use in a stator stack and/or rotor stack is disclosed. The composite material includes a first and a second electrical steel strip layer and a polymeric layer arranged in between, wherein the polymeric layer consists of a crosslinked acrylate-based copolymer of high molecular weight and has a layer thickness in the range from 3 to 20 μm.