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36results about How to "Meet noise requirements" patented technology

Natural wind air conditioner and control method thereof

The invention discloses a control method of a natural wind air conditioner. The control method comprises the following steps that a noise value of current surrounding environment during operation of the natural wind air conditioner is collected in real time; according to the noise value of the current surrounding environment, a corresponding rotating speed threshold value is obtained; according to the rotating speed threshold value, the rotating speed of a fan during operation of the natural wind air conditioner is subjected to speed limiting processing, so that the noise value of the current surrounding environment is lowered. According to the control method of the natural wind air conditioner, the noise of the surrounding environment during operation of the natural wind air conditioner can be effectively controlled, the requirement of noise is met when a user enjoys natural wind, and the comfort of natural wind is further improved. The invention further discloses the natural wind air conditioner.
Owner:GD MIDEA AIR-CONDITIONING EQUIP CO LTD

Method and device for controlling motor rotation speed

The invention discloses a method and device for controlling motor rotation speed. The method comprises the steps of obtaining the current rotation speed of a motor, determining current loop reference value according to the current rotation speed and a set maximum rotation speed, obtaining a three-phase current of the motor, performing proportion-integral calculation according to the three-phase current and the current loop reference value to obtain a current loop output value, and determining motor driving signals for controlling the motor rotation speed according to the current loop output value. According to the method and device, the adjustment of the motor rotation speed of an intelligent appliance having air volume requirements, such as a kitchen ventilator is achieved, and the effect that the load is changed when outside air pressure changes and the motor rotation speed is adjusted automatically to meet the requirements of the air volume is achieved. According to the method and the device, when the outside air pressure changes, the motor rotation speed is stabilized at a maximum rotation speed, the function of meeting the noise requirements is achieved, and the effect of stable operation of the motor under the conditions of idle load or light load is achieved.
Owner:GREE ELECTRIC APPLIANCES INC +1

Spacecraft ultra-quiet environment simulating and testing system

The invention provides a spacecraft ultra-quiet environment simulating and testing system, which includes a crane, a sound absorbing structure, a sound insulation wall, a mass block, an air spring isolator, a vibration isolation track, a laboratory ground base, a sound insulation door, a maintenance channel, a vibration isolation channel, and a fine sand cushion. The sound insulation wall and the laboratory ground base are connected through the vibration isolation track; the mass block and the laboratory ground base are connected through the air spring isolator; the sound absorbing structure and the sound insulation wall are fixedly connected; the crane is located above the mass block; the internal part of the laboratory ground base is provided with the maintenance channel; the sound insulation wall and the sound absorbing structure are connected; the vibration isolation channel is connected with the fine sand cushion. The system of the invention is capable of increasing isolation effect of ground vibration and transverse vibration, increasing the sound insulation effect of the wall, enhancing the isolation effect of air and sound, effectively reducing the background noise in a testing area, meeting the background noise requirement in micro-vibration test and the environmental interference suppression requirement, increasing the isolation effect of the testing area to sounds of solid objects and providing advanced micro-vibration testing means to a high precision large scale spacecraft.
Owner:SHANGHAI INST OF SATELLITE EQUIP

High-resolution refrigeration-type infrared thermal imager

The invention relates to a high-resolution refrigeration-type infrared thermal imager. An input terminal of an infrared optical system receives an infrared radiation signal and an output is connected to an infrared focal plane detector. An output terminal of the infrared focal plane detector is connected to a simulated-signal reading-out unit of a detector driving module. The output terminal is connected to an ADC conversion module. An output terminal of the ADC conversion module is connected to a signal processing and imaging module. The signal processing and imaging module outputs a video signal. Simultaneously, the output terminal is connected to a digital driving signal unit of the detector driving module. An output terminal of a power supply module is connected to a power supply port of each module. The imager possesses advantages of good stability, a compact structure, low power consumption, low cost and the like; various operation and switching of image data can be completed in real time and the data can be output to a display system; the imager is cooperated with the display system and a button so as to realize man-machine interaction; and a detector threshold is controlled, and functions of shooting, video recording, playing, storage, transmission and the like are realized.
Owner:LUOYANG INST OF ELECTRO OPTICAL EQUIP OF AVIC

Low-noise rotating shaft

The invention relates to a low-noise rotating shaft used for a low-noise motor. The rotating shaft is provided with a shaft, a rotor and two bearings, wherein the rotor is provided with a shaft hole; the shaft is pressed in the shaft hole of the rotor after the shaft is provided with a vibration reduction ring at a matching part of the shaft and the rotor shaft hole; both sides of a fixing piece are respectively provided with an anti-skid sleeve; and the two bearings are respectively pressed outside each anti-skid sleeve. The vibration reduction ring is added between the rotor and the shaft, thereby effectively stopping the rotor from transmitting vibration to the shaft so as to reduce noise generated by vibration when the motor is operated, and meet the requirement on noise of floor air conditioners of high-grade places such as villas, clubs, and the like.
Owner:常州威灵电机制造有限公司

Air conditioner outdoor unit piping, method for forming damping material on piping and air conditioner outdoor unit

The invention discloses an air conditioner outdoor unit piping, a method for forming a damping material on the piping and an air conditioner outdoor unit.The air conditioner outdoor unit piping comprises an air suction pipe section and an exhaust pipe section, and the damping material which has the damping and denoising properties is formed on the outer surfaces of the air suction pipe section and the exhaust pipe section.According to the air conditioner outdoor unit piping, the method for forming the damping material on the piping and the air conditioner outdoor unit, due to the fact that the damping material which has the damping and denoising properties is sprayed on the outer surfaces of the air suction pipe section and the exhaust pipe section of the air conditioner outdoor unit, vibration of the air suction pipe section and the exhaust pipe section can be weakened, and noise caused by vibration is reduced; the piping design on the air suction pipe section and the exhaust pipe section is simple; meanwhile, airflow noise caused by refrigerant circulating in the air suction pipe section and the exhaust pipe section can be reduced, vibration and noise of the air conditioner outdoor unit can be reduced, and the refrigerating efficiency of the air conditioner outdoor unit is improved.
Owner:HISENSE (SHANDONG) AIR CONDITIONING CO LTD

Energy-saving and noise-reducing vacuum pump

The invention relates to an energy-saving and noise-reducing vacuum pump, which comprises a motor, a motor shell, a pump body and a pump cover, wherein both ends of a motor shaft are connected with a left pull rod and a right pull rod respectively; the head parts of the left pull rod and the right pull rod are fixedly connected with a film pressing piece and stretch into a left pump chamber and a right pump chamber; and a membrane is arranged between the head parts of the left pull rod and the right pull rod and the film pressing piece. The vacuum pump is characterized in that eccentric wheels are arranged between both ends of the motor shaft and the left pull rod and the right pull rod respectively. After the balance weight of the eccentric wheels is increased, the vacuum pump runs steadily during working, and the deflection phenomena can be avoided. The moving phase of the two pull rods is guaranteed to be 180 degrees so as to reduce various mechanical noises caused by gaps such as the gap between the motor shaft and a motor bearing, the gap between the motor bearing and a motor end cover, the gap between the eccentric wheels and the bearing, the gap between the bearing and the pull rods, and the like, and the mechanical noise is controlled to be below 45 decibels so as to meet the requirements on the noise of household appliances.
Owner:周纪昌

Method and device for reducing dirt retention of air conditioner and air conditioner

The invention provides a method and device for reducing dirt retention of an air conditioner and the air conditioner. The method for reducing dirt retention of the air conditioner includes the steps of detecting the pressure difference between an evaporator and a condenser in real time; judging whether the pressure difference is greater than a first preset pressure difference value when the pressure difference exceeds a preset pressure difference range; when the pressure difference is greater than the first preset pressure difference value, adjusting the rotation speed of an indoor fan and an outdoor fan to be within a preset air speed range; when the pressure difference is smaller than a second preset pressure difference value, stopping adjusting the rotation speed of the indoor fan and the outdoor fan, and stopping detecting the pressure difference between the evaporator and the condenser in real time; and after preset time, beginning detecting the pressure difference between the evaporator and the condenser in real time again. According to the method for reducing dirt retention of the air conditioner, dirt retention of the air conditioner can be reduced, the heat exchange effect can be improved, the noise can be lowered, fly dust can be avoided, indoor cleanliness can be maintained, the comfort level of the air conditioner can be effectively improved, and the user experience can be improved.
Owner:WUHU MATY AIR CONDITIONING EQUIP CO LTD +1

Noise assessment and noise optimization method and device for electric reactor

The invention provides a noise assessment and noise optimization method and device for an electric reactor. The noise assessment method for the electric reactor comprises the steps that basic parameter information of each coil in a to-be-measured electric reactor is acquired; according to the basic parameter information, the maximum displacement of each coil is calculated respectively; according to the maximum displacement and the basic parameter information, an effective value of the vibration velocity of each coil is calculated; according to the effective value of the vibration velocity of each coil, the noise level of the to-be-measured electric reactor is evaluated. The noise assessment and noise optimization method and device for the electric reactor have the advantages that the problem that the noise cannot be evaluated in the early design phase of the electric reactor, the assessment method is simple and effective, a basis is provided for performing noise optimization on the electric reactor subsequently, and the noise assessment and noise optimization method and device have guiding significance for noise reduction design of a smoothing reactor.
Owner:GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2

Coaxially integrated new energy vehicle speed reducer

The invention discloses a coaxially integrated new energy vehicle speed reducer. The speed reducer comprises a speed reducer shell, a differential mechanism, an input shaft assembly and an output shaft assembly, the speed reducer and the differential mechanism are integrally arranged, and the input shaft assembly and the output shaft assembly are coaxially arranged. The output shaft assembly comprises a first output shaft and a second output shaft. One side of the speed reducer shell and a motor shell end cover are integrally arranged. The coaxially integrated new energy vehicle speed reducer is reasonable in structural design, a technical scheme that the input shaft and the output shaft are colinear is adopted to replace traditional straight line arrangement or triangle arrangement so as to reduce the lateral dimension of the whole speed reducer, one side of the shell and a driving motor shell are integrated, the strength is enhanced, and the overall weight is reduced; the differential mechanism is integrated, by means of a modular technology, the differential mechanism can be modularly assembled with the motor directly, the whole assembly procedure of an electric drive system is shortened, and the speed ratio can be adjusted within a certain range by adjusting gear parameters.
Owner:SUZHOU DONGFENG FINEBLANKING ENG

Air duct system of reliability test bed for drive line of high-speed motor train unit

The invention discloses an air duct system of a reliability test bed for a drive line of a high-speed motor train unit, aiming at solving the problem that the service life of the test bed is greatly influenced when heat cannot be exhausted and dissipated timely. The air duct system of the reliability test bed for the drive line of the high-speed motor train unit comprises an air duct cement foundation (A), a cooling fan system (B), an air inlet cylinder system (C) and an air outlet cylinder system (D). The air inlet cylinder system (C) is fixedly arranged on the right end of the air duct cement foundation (A) by an air-inlet pre-embedded anchor hook square-shaped plate (h) pre-cast in the air duct cement foundation (A), the cooling air system (B) is arranged on a middle position of the air duct cement foundation (A) by a fan interface fixing frame assembly body (c) and a cooling fan damper assembly body (b) which are pre-cast in the air duct cement foundation (A), and the air outlet cylinder system (D) is arranged on the left end of the air duct cement foundation (A) through an air outlet duct welding plate (k) pre-cast in the air duct cement foundation (A).
Owner:JILIN UNIV

Charge sensitive preamplifier

The invention discloses a charge sensitive pre-amplifier. The charge sensitive pre-amplifier comprises a feedback circuit, a noise reduction circuit, an amplification circuit and a follower circuit, wherein the first end of the feedback circuit receives a detection signal; one end of the noise reduction circuit is connected with the second end of the feedback circuit, and the other end of the noise reduction circuit is connected with one end of the amplification circuit, and the other end of the amplification circuit is connected with the first end of the follower circuit, and the second end of the follower circuit is connected with the third end of the feedback circuit, and the third end of the follower circuit outputs amplified detection signals; the noise reduction circuit can reduce the noise slope of a detection signal; the amplification circuit can amplify the detection signal after noise reduction; the follower circuit can output the amplified detection signal and reduce the impedance of an output signal; and the feedback capacitor can improve the closed-loop gain of the charge sensitive preamplifier. Therefore, by implementing the charge sensitive pre-amplifier, the performance index of the ionization chamber for charge sensitive pre-discharge can be met, and the function of amplifying the output signal of the ionization chamber is realized.
Owner:CHINESE RES ACAD OF ENVIRONMENTAL SCI

Preparation method of low-noise thin film capacitor

The invention belongs to the technical field of metallized capacitor production, in particular to a preparation method of a low-noise thin film capacitor. The preparation method of the low-noise thinfilm capacitor of the invention maintains the original electrical characteristics, and the tested decibel of the noise is less than 25dB, which meets the requirement of the intelligent home for the noise decibel.
Owner:SICHUAN ZHONGXING ELECTRONICS

Switching frequency control method and device of inverter and computer readable storage medium

The embodiment of the invention provides a switching frequency control method and device of an inverter and a computer readable storage medium. The method comprises the steps: controlling the switching frequency of the inverter to perform random frequency conversion within the frequency conversion range corresponding to the current cycle within the current cycle; obtaining the operating noise amplitude of the inverter in the preset period of the current cycle; increasing the frequency conversion range corresponding to the next cycle when the operating noise amplitude is higher than the presetnoise amplitude threshold; and using the frequency conversion range of the current cycle as the frequency conversion range corresponding to the next cycle when the operating noise amplitude is lower than or equal to the noise amplitude threshold. The frequency conversion range which meets the noise requirement can be found by continuously cycling so that the switching frequency of the inverter israndomly converted within the frequency conversion range which meets the noise requirement, the noise requirement can be met and thus the noise generated by the inverter can be effectively reduced without changing the structure of the inverter or additionally arranging sound isolation and absorption measures.
Owner:GUANGZHOU AUTOMOBILE GROUP CO LTD

Distribution emergency power source

A distribution emergency supply includes a supply vehicle, a tank substation, high voltage up cable, hanging binding clips and low voltage cables among which, the high voltage up cable turns the high voltage electricity from the high voltage circuit to low voltage electricity by the tank substation via the binding clips to be connected with users via the low voltage cable. This invention can make full user of the present distribution network resources to supply electricity not only resume supply at once to certain important users loosing outside supply but also solve the difficulty of ergent need and temporary supply power reaches to 315KVA, 15 times higher than that of ordinary generating equipments.
Owner:岳建国 +1

Composite cold pressing, synthesizing and cementing carrier roller

The invention discloses a composite cold pressing, synthesizing and cementing carrier roller which comprises combination sealing devices, a pipe base, check rings, bearings, spacer rings and a shaft. The shaft penetrates the pipe base, the spacer rings and the bearings are arranged at the two ends of the shaft, and the bearings are fixed to the two ends of the shaft through the check rings. The combination sealing devices penetrate the shaft to be in interference connection with the pipe base to be arranged at the two ends of the shaft. The pipe base is formed by connecting a pipe and bearing pedestals into a whole in a cold pressing, synthesizing and cementing manner, the pipe is made of a straight-line electric welding steel pipe special for an ultrahigh-precision carrier roller through inner and outer pipe rust prevention treatment. The bearing pedestals are made of polyformaldehyde through one-time injection moulding. The production procedure of the bearing pedestals is simplified, the precision of the finished bearing pedestals is improved, the weight is low, and strength is high; and the assembling mode of the bearing pedestals and the steel pipe is simplified, noise is lowered, and the carrier roller is applied to the field of bulk material conveying equipment.
Owner:NORTHERN HEAVY IND GRP CO LTD

Efficient heat dissipation high-power stage lamp with mute effect

The invention discloses an efficient heat dissipation high-power stage lamp with a mute effect, belonging to the field of stage lamps. The stage lamp comprises: a lamp shell, wherein two air inlets are symmetrically formed in the two sides of the top of the lamp shell, and two air outlets are symmetrically formed in the two sides of the bottom of the lamp shell; an air inlet unit, which is arranged at the inner top of the lamp shell and is close to the position of the air inlet; a lamp assembly, which is arranged at the inner bottom of the lamp shell and is close to the air outlets; and an air outlet unit, which is arranged at the inner middle part of the lamp shell. According to the stage lamp, a heat dissipation assembly is composed of the air inlet unit and the air outlet unit, the heat dissipation scheme of vortex fan relay type air blowing (or air blasting) is adopted for two or more sets of fans of the air inlet unit and the air outlet unit, and the rotating speed of vortex fans serving as a noise source is controlled, so a heat dissipation requirement can be met, and low noise can be achieved.
Owner:PR LIGHTING

Spacecraft ultra-quiet environment simulation test system

The invention provides a spacecraft ultra-quiet environment simulating and testing system, which includes a crane, a sound absorbing structure, a sound insulation wall, a mass block, an air spring isolator, a vibration isolation track, a laboratory ground base, a sound insulation door, a maintenance channel, a vibration isolation channel, and a fine sand cushion. The sound insulation wall and the laboratory ground base are connected through the vibration isolation track; the mass block and the laboratory ground base are connected through the air spring isolator; the sound absorbing structure and the sound insulation wall are fixedly connected; the crane is located above the mass block; the internal part of the laboratory ground base is provided with the maintenance channel; the sound insulation wall and the sound absorbing structure are connected; the vibration isolation channel is connected with the fine sand cushion. The system of the invention is capable of increasing isolation effect of ground vibration and transverse vibration, increasing the sound insulation effect of the wall, enhancing the isolation effect of air and sound, effectively reducing the background noise in a testing area, meeting the background noise requirement in micro-vibration test and the environmental interference suppression requirement, increasing the isolation effect of the testing area to sounds of solid objects and providing advanced micro-vibration testing means to a high precision large scale spacecraft.
Owner:SHANGHAI INST OF SATELLITE EQUIP

Inverter switching frequency control method, device and computer-readable storage medium

The embodiment of the invention provides a switching frequency control method and device of an inverter and a computer readable storage medium. The method comprises the steps: controlling the switching frequency of the inverter to perform random frequency conversion within the frequency conversion range corresponding to the current cycle within the current cycle; obtaining the operating noise amplitude of the inverter in the preset period of the current cycle; increasing the frequency conversion range corresponding to the next cycle when the operating noise amplitude is higher than the presetnoise amplitude threshold; and using the frequency conversion range of the current cycle as the frequency conversion range corresponding to the next cycle when the operating noise amplitude is lower than or equal to the noise amplitude threshold. The frequency conversion range which meets the noise requirement can be found by continuously cycling so that the switching frequency of the inverter israndomly converted within the frequency conversion range which meets the noise requirement, the noise requirement can be met and thus the noise generated by the inverter can be effectively reduced without changing the structure of the inverter or additionally arranging sound isolation and absorption measures.
Owner:GUANGZHOU AUTOMOBILE GROUP CO LTD

Fan configuration method of domain controller of vehicle and related device

The invention discloses a fan configuration method for a domain controller of a vehicle and a related device, aiming at a to-be-configured fan of the domain controller of the vehicle, firstly, a system resistance characteristic curve of the domain controller of the vehicle and the minimum air volume of the to-be-configured fan required by heat dissipation of the domain controller are obtained, and the minimum air volume of the to-be-configured fan required by heat dissipation of the domain controller is obtained by combining an air volume-air pressure curve of the to-be-configured fan; determining the minimum working point of the fan to be configured; secondly, the maximum working point of the fan to be configured is determined according to the noise preset threshold value of the domain controller and the noise-duty ratio curve of the fan to be configured; and finally, the configuration work for the to-be-configured fan is completed according to the working interval marked by the minimum working point and the maximum working point. Therefore, in the fan configuration process of the domain controller of the vehicle, the working interval of the to-be-configured fan is determined by considering the design requirements of the air volume and the noise at the same time, and the to-be-configured fan can meet the heat dissipation requirement of the domain controller and can also meet the noise requirement of the domain controller when working based on the fan configuration.
Owner:NEUSOFT REACH AUTOMOBILE TECH (SHENYANG) CO LTD

A reactor noise evaluation and noise optimization method and device

The invention provides a noise assessment and noise optimization method and device for an electric reactor. The noise assessment method for the electric reactor comprises the steps that basic parameter information of each coil in a to-be-measured electric reactor is acquired; according to the basic parameter information, the maximum displacement of each coil is calculated respectively; according to the maximum displacement and the basic parameter information, an effective value of the vibration velocity of each coil is calculated; according to the effective value of the vibration velocity of each coil, the noise level of the to-be-measured electric reactor is evaluated. The noise assessment and noise optimization method and device for the electric reactor have the advantages that the problem that the noise cannot be evaluated in the early design phase of the electric reactor, the assessment method is simple and effective, a basis is provided for performing noise optimization on the electric reactor subsequently, and the noise assessment and noise optimization method and device have guiding significance for noise reduction design of a smoothing reactor.
Owner:GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2

Fine dimming device and dimming control method for light emitting diode (LED) module

The invention discloses a fine dimming device for a light emitting diode (LED) module. According to the device, a first pulse width modulation (PWM) signal output interface of the central processing unit (CPU) is connected with a signal input end of a first field-effect transistor; a signal output end of the first field-effect transistor is connected with a control end of the LED module through a current-limiting module; a second PWM signal output interface of the CPU is connected with a signal input end of a second field-effect transistor; and a signal output end of the second field-effect transistor is connected with the control end of the LED module. A dimming method comprises the following steps of: 1, judging whether luminosity corresponding to the light illumination which is required to be output by the LED module is greater than 5 percent of the maximum luminosity of the LED module; 2, if the luminosity is not greater than 5 percent of the maximum luminosity of the LED module, controlling the LED module to illuminate through a first PWM control signal by the CPU; and 3, if the luminosity is greater than 5 percent of the maximum luminosity of the LED module, controlling the LED module to illuminate after the first PWM control signal and the second PWM control signal which are sent by the CPU are superposed. According to the method, the ratio of the minimum illumination output to the maximum illumination output exceeds 1:10,000, so the dimming fineness of the LED module is guaranteed.
Owner:佑图物理应用科技发展(武汉)有限公司

An ultra-thin low-noise energy-saving window-sill air supply system for improving indoor environment

The invention relates to an ultra-thin, low-noise, energy-saving window-sill air supply system for improving the indoor environment. The air supply unit includes a cabinet-shaped outer cover and a fan coil unit built in the outer cover; The air outlet panel is horizontally set on the upper end surface of the outsourcing steel frame; the decorative plate is vertically set in front of the outsourcing steel frame, and there is a return air panel hanging on the outsourcing steel frame below it; the fan coil unit includes a bottom bracket, erected on The fan coil body on the bracket and the air-conditioning water pipe protruding from the fan coil, and a storage cabinet is arranged between two adjacent fan coil bodies. The advantages of the present invention are: the air supply units are arranged in a row along the curtain wall, and the air outlets thereof face upward, which can effectively remove the water mist on the glass curtain wall, and the air-conditioning water pipes are arranged in the storage cabinet between the two air supply units. It no longer occupies the space on the back of the fan coil unit, greatly increases the effective area of ​​the room, and reduces the thickness of the air supply device.
Owner:风神空气生态技术工程(上海)有限公司 +1

A High-Resolution Cooled Infrared Thermal Imager

The invention relates to a high-resolution refrigeration-type infrared thermal imager. An input terminal of an infrared optical system receives an infrared radiation signal and an output is connected to an infrared focal plane detector. An output terminal of the infrared focal plane detector is connected to a simulated-signal reading-out unit of a detector driving module. The output terminal is connected to an ADC conversion module. An output terminal of the ADC conversion module is connected to a signal processing and imaging module. The signal processing and imaging module outputs a video signal. Simultaneously, the output terminal is connected to a digital driving signal unit of the detector driving module. An output terminal of a power supply module is connected to a power supply port of each module. The imager possesses advantages of good stability, a compact structure, low power consumption, low cost and the like; various operation and switching of image data can be completed in real time and the data can be output to a display system; the imager is cooperated with the display system and a button so as to realize man-machine interaction; and a detector threshold is controlled, and functions of shooting, video recording, playing, storage, transmission and the like are realized.
Owner:LUOYANG INST OF ELECTRO OPTICAL EQUIP OF AVIC
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