45 results about "Acoustic Noise Testing" patented technology

The invention provides an air conditioner noise testing method. A noise laboratory for noise testing is included. The noise laboratory is divided into a noise laboratory indoor area and a noise laboratory outdoor area, and an air conditioner indoor unit and an air conditioner outdoor unit are separately arranged in the noise laboratory indoor area and the noise laboratory outdoor area, and the airconditioner indoor unit is connected with the air conditioner outdoor unit; pickups used for testing are separately and uniformly arranged in the noise laboratory indoor area in a high-middle-low multi-point distribution mode to perform noise collection test, and the result is output. According to the air conditioner noise testing method, the real noise condition of air conditioners in differentstates of users can be tested. The testing result is accurate, and the real conditions of air conditioner noise experienced by the users in different states can be effectively reflected.

The invention discloses a test method for a touch on cell (TOC). The test method comprises the steps of screening out a standard integrated screen; performing a noise test on the standard integrated screen to collect test data; performing statistics on the test data, obtaining the maximum range of various indicators of the noise test through the statistics result and taking the maximum range of various indicators as a standard threshold value; performing a noise test on the integrated screen to be tested, comparing the indicators of the noise test with the standard threshold value, judging that the noise test is qualified if the indicators are within the standard threshold value, and otherwise, judging that the noise test is unqualified. The test method for the TOC is high in detection accuracy, convenient to implement, low in implementation cost and capable of promoting popularization of the integrated screen.

The invention provides an air conditioner noise testing device and method. The air conditioner noise testing device comprises an outdoor noise chamber, an indoor noise chamber and a boundary wall arranged between the indoor noise chamber and the outdoor noise chamber. An outdoor unit installation platform is arranged in the outdoor noise chamber and used for installing an air conditioner outdoor unit, and the outdoor unit installation platform is connected with the boundary wall. Compared with a semi-anechoic chamber in the prior art, the air conditioner noise testing device provided by the invention can simulate the real installation condition of the air conditioner in a user home, guarantees that vibration of the air conditioner outdoor unit can effectively cause wall resonance, and transmit resonance noise to the indoor side, so the noise test result is consistent with real noise of a user site, and the result is more accurate and reliable.

The invention discloses an oil pump noise test device. The device comprises a base supporting frame, a base supporting air cylinder and a vibration sensor unit; the upper end of an oil pump to be tested is hung and fixed, the base supporting frame vertically moves along with the telescopic motion of an ejector rod of the base supporting air cylinder, and when the base supporting frame moves to the upper end, the oil pump to be tested is supported; when the base supporting frame moves to the lower end, the oil pump to be tested is separated from the base supporting frame and is in the midair-suspending state; and the vibration sensor unit can be mounted on and fixed to a shell of the oil pump to be tested in a combined manner, and the vibration sensor unit is used for detecting output vibration signals. The invention further discloses an oil pump noise test method. According to the oil pump noise test device and test method, the actual level of the noise of the oil pump to be tested can be accurately reflected.

The invention discloses a noise testing device for a speed reducer. The device comprises a bottom plate, a connecting unit, a lifting unit, a lifting plate and a double-shaft motor, two symmetrically-distributed guide rails are arranged on the left side of the upper surface of the bottom plate. Rack grooves are formed in the inner sides of the guide rails; four supporting legs which are symmetrically distributed are arranged at the right end of the upper surface of the bottom plate; the upper surfaces of the support legs are connected with the lower surface of a bedplate; the upper surface ofthe bedplate is fixedly connected with the lower surface of a stator of the linear motor; the upper surface of a rotor of the linear motor is fixedly connected with a test motor; the connecting unit is arranged at the tail end of the output shaft of the test motor; the end head of the output shaft of a dual shaft motor is fixedly connected with the gear, the gear is connected with the inside of the corresponding rack groove in an engagement way, and a movable plate is fixedly connected on the upper surface of the dual shaft motor. According to the noise testing device for the speed reducer, anassembly line operation mode is adopted, the noise testing device for the speed reducer is high in testing speed, high in efficiency and accurate in testing result, manpower and labor force are saved, and convenience is brought to people.

The invention discloses a noise testing method for an air-cooled inverter refrigerator, and relates to the technical field of refrigerators. The method comprises the steps that parts capable of generating noise in the refrigerator are determined, and then the running time of a noise testing program is determined; a noise test program preparation stage; operation noise frequencies of the air door and the electric valve are obtained; operation noise values of a refrigeration fan and a condenser fan are obtained; obtaining an operation noise value of the compressor; the operation noise value during combined operation of the compressor, the refrigeration fan and the condenser fan is obtained; and ending the noise test of the refrigerator. By testing the noise values generated during operation of different parts in stages, various noises possibly generated during operation of the refrigerator can be quickly determined, so that a product is better guided to be improved, and the method has high market application value.

The invention relates to an electric locomotive speed reducer assembly noise testing device and a testing method thereof. The electric locomotive speed reducer assembly noise testing device comprisesa rack, a speed reducer connecting mechanism, a half-shaft axle housing connecting mechanism and a load mechanism are connected with the rack, and the speed reducer connecting mechanism comprises a transmission mechanism which comprises a rotating base and a motor connecting flange base; the speed reducer assembly is pressed on the rotating base through a first driving air cylinder, the motor connecting flange base is connected with a driving motor in driving connection with the speed reducer assembly, the half-shaft axle housing connecting mechanism comprises an axle housing body, an upper axle housing body connecting oil filling port, a lower axle housing body connecting oil filling port and an oil drain valve, two half shafts penetrate through the two sides of the axle housing body, andthe axle housing body is further connected with a second driving air cylinder. The load mechanism comprises a sliding shaft, the two ends of the sliding shaft are connected with a rotating shaft anda third driving air cylinder respectively, the rotating shaft is connected with a disc brake disc, and the sliding shaft matching the disc brake disc is connected with disc brake pincers. The electriclocomotive speed reducer assembly noise testing device and the testing method thereof are used for testing noise generated when the speed reducer assembly runs, and testing installation and operationare simple.

The invention belongs to the technical field of air conditioner testing, and particularly discloses a method capable of accurately testing the thermal expansion and cold shrinkage abnormal sound condition of an air conditioner indoor unit. According to the testing method, the tested air conditioner indoor unit is installed in a testing room and connected with an external air conditioner outdoor unit, a pickup is arranged at a proper position, after an air conditioner is started to enable the operation state of the air conditioner to be consistent, the air conditioner indoor unit stands by simulating the actual use environment of the air conditioner indoor unit, then the environment temperature is improved, the air conditioner indoor unit is controlled to operate in a low-air heating manner to carry out thermal expansion noise testing, then the air conditioner indoor unit is turned off, meanwhile, the environment temperature is reduced to carry out cold shrinkage noise testing, a thermal expansion noise curve and a cold shrinkage noise curve are drawn according to noise data acquired by the pickup after testing is completed, and finally noise sharp points of the two noise curves which are 2-4 dB (A) higher than respective background noise curves are counted; and the thermal expansion and cold shrinkage abnormal sound condition of the air conditioner indoor unit can be effectively detected, and the accuracy of a testing result is high.

The invention relates to the field of air conditioners, and discloses a variable frequency air conditioner pipeline vibration and low-frequency noise evaluation method which is used for solving the problem that the accuracy of pipeline vibration and low-frequency noise evaluation is low. The method comprises the steps that firstly, a compressor and pipeline system finite element model is established according to structural parameters of a compressor and structural parameters of a pipeline; then, compressor and pipeline coupling vibration simulation is conducted based on the compressor and pipeline system finite element model, vibration noise evaluation is conducted on a simulation result; if the vibration noise evaluation is qualified, the compressor and pipeline system finite element model at the moment is machined into a prototype, and vibration noise testing is conducted on the prototype; and if the vibration noise evaluation is not qualified, the structural parameters of the pipeline are optimized by using an automatic pipeline optimization method, thus re-establishing a compressor and pipeline system finite element model, carrying out coupled vibration simulation, and carrying out vibration noise evaluation on a simulation result. The invention is suitable for variable frequency air conditioner pipeline vibration and low-frequency noise evaluation.

The invention relates to a draw-bar box horizontal noise testing method which comprises the steps that: two to-be-tested pavements are selected, and an anechoic chamber is built; a plurality of to-be-tested draw-bar boxes are prepared; running guide rail devices are arranged on the two sides of the to-be-tested pavements, movable semi-fixing devices are mounted in the running guide rail devices, and the semi-fixing devices are used for fixedly assembling a to-be-tested draw-bar box; a steel wire rope disc is driven by a servo motor at one end of each running guide rail device to rotate forwards and backwards to form a traction device to realize reciprocating motion of the box; a noise acquisition device is arranged at a position vertical to the upper part of the ground, and synchronously moves along with the draw-bar box; and four-wheel and two-wheel walking tests are carried out. According to the invention, two-wheel landing and four-wheel landing noise tests are carried out, so thatthe accuracy of the noise test of the draw-bar box is improved, the limitation brought by the conventional test mode is overcome, and improvement of the flexibility of the noise test operation of thedraw-bar box product by technicians is facilitated.

The invention discloses a noise detection method for a range hood. The noise detection method comprises the following steps: step 1, acquiring air performance data of the range hood and drawing an air volume-static pressure curve and an air volume-power curve; step 2,mounting the range hood and noise testing equipment located at a testing point, mounting a smoke tube of the range hood, and mounting an air volume adjusting valve on the smoke tube, wherein according to the air volume-power corresponding relation of the range hood, the motor power of the range hood is adjusted by adjusting the valve opening degree of an air volume adjusting valve, and after the power points of the range hood are controlled to be in one-to-one correspondence with the power points on the air volume-power curve, the working noises of the range hood are measured; and step 3, drawing working noise-power, working noise-air volume and working noise-static pressure curves according to the working noise data obtained through testing. All working states of the range hood are covered, so that noise data better fits the actual experience of a user, and the development work is better guided.

The invention relates to an automobile refrigerant flowing noise testing device and method, and belongs to the field of automobile air conditioning system noise testing. The device comprises an enthalpy difference performance table, and an acquisition and analysis system, a noise reduction system and a tested air conditioner which are arranged in the enthalpy difference performance table. The enthalpy difference performance table comprises a first evaporation chamber, a second evaporation chamber and a condensation chamber which are arranged in a mutually isolated manner, and a refrigerating / heating system and a controller thereof which are arranged on the outer side of the first evaporation chamber, the second evaporation chamber or the condensation chamber. The controller controls the refrigerating / heating system to provide environment temperature and humidity for the first evaporation chamber, the second evaporation chamber and the condensation chamber, so that environment bottom noise is guaranteed to be small during noise testing, environment temperature and humidity control factors are introduced, and the condition of noise caused by refrigerant flowing in real vehicle running is simulated more truly.

The invention relates to a building airtight performance and noise testing instrument comprising a base, the top of the base is rotatably connected with a placing plate, the top of the placing plate is provided with two symmetrically arranged shells, the bottom of one of the two shells is fixedly connected with the placing plate, and the inner wall of the shell is fixedly provided with a plurality of fixing rods. A rotating shaft is rotatably connected to each fixing rod, fan blades are fixedly installed at one end of the rotating shaft, openings are formed in the two sides of each shell, filtering plates are fixedly installed on the openings, a transmission rod is rotatably connected to the inner wall of each shell, the transmission rod is in transmission connection with the rotating shaft, and a first motor is fixedly installed at the top of one of the two shells; and output shafts of the first motors are fixedly connected with the corresponding transmission rods. The instrument is easy to operate and convenient to use, people can carry the instrument conveniently, meanwhile, all-around air blowing can be conducted indoors, and then indoor air tightness and noise can be detected conveniently.

The invention discloses a vibration-damping pad noise testing system, which relates to the field of vibration-damping material testing. It includes a frame placed in a semi-anechoic chamber, an air conditioner external unit is placed on the frame, and microphones are arranged around the air conditioner external unit. The lower ends of the feet of the air conditioner external unit are bolted to the vibration damping pad, and the microphone is electrically connected to the noise and vibration test and analysis system and provides the system with collected noise sources. The noise and vibration test and analysis system is used for comparative analysis of the air conditioner outdoor unit In different environmental operation modes and the data difference of the noise source before and after using the vibration damping pad, the present invention collects the position and decibel of the sound source by setting microphones around the air conditioner outdoor unit, and compares and analyzes the air conditioner outdoor unit in different uses through the noise vibration test and analysis system. The data difference of the noise source before and after using the vibration damping pad in the environmental operation mode provides more data for the performance research of the vibration damping pad.

The invention discloses a bi-directional automobile special noise testing method. An experimental device used by the method comprises a first sound level meter, a second sound level meter, a third sound level meter, a fourth sound level meter, a high speed data collecting card NI, a computer and a software processing system thereof, a sound-insulating front checking plate, a sound-insulating bottom checking plate, a machine frame, a 12 V accumulator, and a 12 V to 220 V transformer. The device has the beneficial effects of increasing the sound-insulating effect, and testing the noises from two directions of the bottom part and the side face of the device through installing the sound-insulating front checking plate and the first sound level meter and the second sound level meter installed on the sound-insulating front checking plate, the sound-insulating bottom checking plate and the third sound level meter and the fourth sound level meter installed on the sound-insulating bottom checking plate, the high speed data collecting card NI, the computer and the software processing system thereof, discovering the noise frequency distribution of the device in time through FFT data processing of a time domain signal, and providing the reliable experimental data for the automobile noise reduction. The structure is simple, the operation is convenient, and the device is economical and practical.

The invention relates to the field of air conditioners, and discloses a method for evaluating pipeline vibration and low-frequency noise of a variable-frequency air conditioner, which is used to solve the problem of low accuracy of pipeline vibration and low-frequency noise evaluation. The present invention firstly establishes the finite element model of the compressor and the pipeline system according to the structural parameters of the compressor and the pipeline; The simulation results are used for vibration and noise evaluation. If the vibration and noise evaluation is qualified, the finite element model of the compressor and pipeline system at this time is processed into a prototype, and the prototype is tested for vibration and noise. If the vibration and noise evaluation is unqualified, the pipeline is used. After the automatic optimization method optimizes the structural parameters of the pipeline, the finite element model of the compressor and the pipeline system is re-established, and the coupled vibration simulation is carried out and the simulation results are evaluated for vibration and noise. The invention is suitable for evaluating the pipeline vibration and low-frequency noise of the variable-frequency air conditioner.

The invention provides a noise testing device and method for an external unit, the device includes a detection room, a data processing device, a data acquisition device, and a power supply device; Connection; the testing room includes a wall, a ceiling, and a partition wall. The wall is matched with the ceiling, and the partition wall is respectively matched with the wall and the ceiling. On the indoor side, the outdoor unit of the air conditioner is connected to the indoor unit, the data acquisition device is installed on the outdoor side, and the data processing device is connected to the data acquisition device. The power supply device includes a frequency conversion power supply and a harmonic generator. The wave generator is connected with the internal machine. The device and method for testing the noise of an external machine according to the present invention eliminates the influence of the harmonics of the power supply on the noise test of the external machine to the greatest extent, and is beneficial to improving the accuracy of noise detection of the external machine.

The invention discloses a selecting method for an air inlet ring of a fan system. The fan system comprises a volute, an impeller arranged in the volute and the air inlet ring arranged at an air inlet of the volute. The air inlet ring comprises a radial flow guide part, an axial flow guide part axially extending from the radial inner side of the radial flow guide part to the inside of the volute and a net arranged on the radial inner side of the radial flow guide part, meshes are formed in the net, the inner diameter of the axial flow guide part is D1, the hole diameter of the meshes is D0, the height of the axial flow guide part is d, and the distance between the air inlet and the impeller is d1. The selecting method comprises the following steps that (1) the ranges of three parameters D1, D0 and d of the air inlet ring are limited; and 2) each parameter value is determined by adopting a control variable method: taking one parameter as a variable, changing the variable, keeping other parameters unchanged, carrying out noise test and air volume test, observing the noise condition under the condition of ensuring that the air volume is unchanged, and selecting a value corresponding to the variable when the noise is minimum as a corresponding size numerical value of the air inlet ring.

A noise test tool for a ceiling mounted cassette type air conditioner comprises a lifting frame, and a lift driving part used for driving the lifting frame to do lifting motion; the lifting frame is connected with a hooking part, and the lift driving part is connected with a lift driving control device; a body of the ceiling mounted cassette type air conditioner is provided with a hooking slot, and the hooking part can be connected with the hooking slot for hooking the body of the ceiling mounted cassette type air conditioner; and the lifting frame and the hooking part are driven by the lift driving part under the control of the lift driving control device to do lifting motion, so that the ceiling mounted cassette type air conditioner hooked by the hook part is driven to do lifting motion.According to the noise test tool for the ceiling mounted cassette type air conditioner, the standard design structure of the ceiling mounted cassette type air conditioner is utilized fully, and the problem of inconvenient manual operation in test experiment is solved through an automatic mechanical tool; the labor cost is saved, and potential safety hazards are reduced; meanwhile the stability and accuracy of experimental data are improved, and thus the experimental operating efficiency and safety are improved on the basis of achieving automatic pick and place of the ceiling mounted cassettetype air conditioner.

The invention belongs to the field of electrical equipment, and specifically relates to a working method of environment-friendly noise-reducing power generation equipment. A control module, a plurality of noise testers connected with an input end of the control module, a machine room, a plurality of generator units arranged in the machine room, a sound-absorption compound fabric laid at the innersides of walls of the machine room, and a stretching assembly located at the bottom of the sound-absorption compound fabric are comprised; the noise testers are located at the periphery of the machineroom, and used for detecting the quantity of a noise escaped from the machine room; and the control module is applicable to controlling the stretching assembly to stretch the sound-absorption compound fabric into wave lines with adjustable wave trough depths, so that the noise generated by the generator units is absorbed, and the detection value of the noise quantity is enabled to meet a set threshold value. The outward radiation of the noise in the machine room can be effectively reduced, and noise pollution to an environment is reduced.

The invention provides an air guide ring structure beneficial to reduction of rotation order noise and a setting method thereof.The air guide ring structure is installed at an air outlet of a fan cover, the air outlet of the fan cover comprises an air guide ring, a plurality of bosses arranged around the circumference are arranged on the air guide ring, and the upper portion of any boss is connected with a check ring of the air outlet of the fan cover through a reinforcing rib; an opening groove with an upward opening is formed in the air guide ring between any two adjacent bosses, and at least one air guide blade is arranged in the opening groove; one end and the bottom face of each air guide blade are connected with the corresponding open groove close to the air guide blade into a whole, and a first space is reserved between the other end of each air guide blade and the corresponding open groove close to the air guide blade. A plurality of open grooves are formed in the air guide ring, the blade type is designed according to an existing fan blade, the specific position, angle and height of the air guide blade needing to be added to the air guide ring are analyzed in combination with flow field analysis and sound field distribution of noise testing, and the application range is wide; the insert is added on the basis of an existing mold to produce the air guide blade, the mold does not need to be opened again, and the production cost is reduced.

The invention discloses a noise testing device and method for motor production, and the device comprises a conveying belt which is located at the upper end of the ground, the left and right ends of the conveying belt are supported through supporting rods, rotating shaft bearings at the left and right ends of the conveying belt are connected with the supporting rods, the side edge of the conveying belt is provided with an inner supporting plate, the surface of the conveying belt is provided with a clamping groove, and the number of the supporting rods is four. The four supporting rods are welded to the upper portions of the front end and the rear end of the left side and the right side of the base plate correspondingly. According to the noise testing device for motor production and the testing method, a sliding plate is arranged, second motors on the left side and the right side of the lower end of the sliding plate drive lead screws to enable an upper measuring head to be attached to the side wall of a motor, and a lower measuring head above a lower end testing plate is matched to conduct electromagnetic noise testing at the middle section position of the motor; and then side test heads at the front end and the rear end of the test plate are attached to the front end and the rear end of the motor under the driving of a fourth push-pull rod to test ventilation noise and mechanical noise, so that multiple noises in the motor are tested, and more comprehensive test data are obtained.

The invention relates to the technical field of earphone noise reduction testing, in particular to a testing device and method for a noise reduction earphone, and the device comprises an isolation box body which is provided with a sealing door used for sealing the isolation box body; the table top is connected into the isolation box body in a displaceable manner through a first adjusting mechanism and can extend out of the isolation box body or be stored in the isolation box body; the earphone placing frame is arranged in the middle of the table top; the loudspeakers are arranged on the two sides of the earphone placing frame in a displaceable mode through second adjusting mechanisms, and the position angles of the loudspeakers can be adjusted relative to the earphone placing frame. Through the arrangement, the table top can be moved into the isolation box body, so that the whole testing device is located in a closed space, the testing result is not influenced by external factors, the accuracy of the testing result is ensured, noise testing in different directions can be carried out on the earphone by moving the position of the loudspeaker, and the testing efficiency is improved. Therefore, the noise reduction function of the earphone is comprehensively tested, and the accuracy of a test result is improved.

The invention discloses a noise testing device and a noise testing method for a duct type air conditioner. The device comprises a housing which is internally provided with an assembly cavity for the assembly of a duct type air conditioner, a first air return part arranged on one side wall of the housing and communicated with an external space and the assembly cavity, a second air return part arranged at the bottom of the housing and communicated with the external space and the assembly cavity, an air outlet part communicated with the assembly cavity and arranged on the side wall, opposite to the first air return part, of the housing, a hoisting part arranged on the outer side of the housing and used for hoisting the testing device, a noise pickup device for picking up a noise value, and amain controller in communication connection with the noise pickup device and at least capable of receiving noise signals sent by the noise pickup device. Therefore, problems of large noise value deviation and low measurement accuracy of a wind pipe machine noise test in the prior art are solved.

The invention provides a motor concentricity comparison method, system and device and a computer readable storage medium. The method comprises the following steps: S1, numbering all motors: 1, 2, 3...; S2, installing the motor 1, the motor 2, the motor 3 and the like on a using machine type, carrying out single-air-outlet noise testing, andcalculating the rotating frequency according to the actualrotating speed of the motor, wherein the rotating frequency is equal to the actual rotating speed of the motor / 60; S3, collecting noise under different rotation frequencies when the motor 1, 2, 3...work through a noise tester; S4, comparing the noise of the motors 1, 2, 3... at a special rotating frequency point andcarrying out ranking, wherein the motor with the smallest noise value is the motor with the best concentricityofthe stator and the rotor; the method has the advantages that the noise of the stator and the rotor of the motor at a special rotating frequency point is used as a measurement standard, and the concentricity of the stator and the rotor of different motors can be rapidly, simply and conveniently compared.

The invention discloses a shoe sole noise testing machine and a testing method, and relates to the field of testing equipment. Including the test box, the bottom of the test box is equipped with a test base, the test base is equipped with a friction turntable, the test base is equipped with a rotating device, the test box is equipped with a guide slider, and the test box is equipped with a test fixture. The test fixture includes a shoe last, Connecting head, the upper end of the connecting head is provided with a load-bearing rod, the upper part of the load-bearing rod is provided with weights, the two ends of the load-bearing rod are provided with sliding shafts, the sliding shaft is fixedly connected with the load-bearing rod, and the sliding shaft is slidably connected with the guide slider. Equipped with a decibel meter. The friction turntable is driven by the rotating device, and the shoes rub on the friction turntable. A variable number of weights can be placed on the shoes. The slider and the slide rail cooperate, combined with the friction liquid, to simulate friction on the friction turntable after wearing shoes, and the decibel meter records As a result, the structure is sound, the results are reliable, and the tests are fast.

The invention provides an outdoor unit noise testing device and method. The device comprises a detection chamber, a data processing device, a data acquisition device and a power supply device. The data processing device and the power supply device are arranged outside the detection chamber; the data processing device is connected with the power supply device; the detection chamber comprises an enclosing wall, a ceiling and a partition wall. The enclosing wall is matched with the ceiling, and the partition wall is matched with the enclosing wall and the ceiling and divides the detection chamberinto an indoor side and an outdoor side; the air conditioner outdoor unit is arranged on the outdoor side, the indoor unit is arranged on the indoor side, the air conditioner outdoor unit is connected with the indoor unit, the data acquisition device is arranged on the outdoor side, the data processing device is connected with the data acquisition device, the power supply device comprises a variable-frequency power supply and a harmonic generator, the variable-frequency power supply is connected with the harmonic generator, and the harmonic generator is connected with the indoor unit. According to the outdoor unit noise testing device and method, the influence of power supply harmonics on outdoor unit noise testing is eliminated to the maximum extent, and the accuracy of outdoor unit noise detection is improved.