142 results about "Acoustic testing" patented technology

The invention discloses a construction method of an assembly type vibration isolation trench. The method comprises the following steps: firstly, designing and prefabricating a vibration isolation trench unit according to construction site conditions, underground water flow and vibration isolation requirements, including site analysis, size material determination, simulation optimization and quality inspection; before construction, field survey is carried out, topography and geology are covered, underground pipeline detection and vibration source analysis are carried out, the excavation path and depth are determined, and field preparation is made. And then digging a trench by using special equipment according to the design, controlling trench wall parameters and carrying out acceptance inspection. And then gravel and an anti-seepage film are sequentially laid at the bottom of the groove, and a drainage facility is additionally arranged according to needs so as to install a vibration isolation layer. The prefabricated units are lifted, adjusted and connected, then light materials are filled, then fine sand and geotechnical cloth are covered, and soil is recovered. And finally, adjusting and optimizing according to a result through vibration and acoustic testing. According to the method, through multiple layers of vibration isolation materials, firm connecting pieces and strict testing, the vibration isolation effect and stability are remarkably improved, and an effective scheme is provided for engineering vibration isolation.

Embodiments provide a method for acoustically testing at least one MEMS device of a plurality of MEMS devices. The method comprises a step of providing at least one MEMS device. Additionally, the method comprises a step of exciting the at least one MEMS device to an acoustic vibration. Additionally, the method comprises a step of detecting the acoustic vibration of the at least one MEMS device by at least one sound sensor. Additionally, the method comprises a step of evaluating the acoustic vibration of the at least one MEMS device detected by the at least one sound sensor to test the at least one MEMS device as to an intended functionality.

The invention provides an acoustic testing device for an air conditioner air duct, and belongs to the technical field of testing. The acoustic testing device comprises a first impedance tube, a second impedance tube, a microphone, a data collector and a signal processor; the first impedance tube and the second impedance tube are respectively arranged at two ends of a tested air conditioner duct, a first end of the first impedance tube is provided with a sound source, a first output end of the data collector is used for outputting a voltage signal to drive the sound source to output a sound wave signal, and a microphone is arranged on the wall or inside of each of the first impedance tube and the second impedance tube; the output end of the microphone is connected to the signal processor through the data collector, and the signal processor is used for calculating the transmission loss of the tested air conditioner air duct based on the output data of the microphone in the first state and the output data of the microphone in the second state to obtain the acoustic test result of the tested air conditioner air duct. According to the acoustic testing device for the air conditioner air duct, the testing precision can be improved while the testing cost is reduced.

The invention relates to the technical field of nondestructive testing of engine blades, and discloses an in-service in-situ electromagnetic acoustic detection system and method for aero-engine blades, which adopt an integrated design of an array eddy current sensor and an array surface wave sensor, ensure that dangerous cracks exposed out of a blade tenon can be reliably detected by an eddy current method, and meanwhile, improve the detection accuracy of the blade tenon. The internal fatigue damage can also be detected by an ultrasonic method, so that the engineering application problem that the embedded fatigue crack of the blade tenon of the aero-engine cannot be effectively detected in situ is solved.

The present application belongs to the field of rock burst risk assessment of deep rock engineering, and particularly relates to a quantitative evaluation method for rock burst tendency of surrounding rock under multiple disturbances, which comprises the following steps: obtaining the distribution depth of excavation damage zone through acoustic testing, and obtaining the average wave velocity of rock mass in the range of original rock zone; obtaining the geological strength index and disturbance factor through the average wave velocity; further obtaining the residual elastic energy of surrounding rock based on the geological strength index and disturbance factor, and evaluating the rock burst tendency of surrounding rock through the residual elastic energy of surrounding rock; the acoustic testing points of surrounding rock are unchanged, and the rock burst tendency of surrounding rock is evaluated after each excavation footage of the working face is completed, until the distribution characteristics of rock burst tendency no longer change obviously, which is taken as the long-term evaluation result of rock burst tendency of surrounding rock. The quantitative evaluation formula of rock burst tendency of surrounding rock considers the rock mass structure effect, which is reflected in the geological strength index, and considers the excavation disturbance effect, which is consistent with the actual situation of engineering construction process, and has strong practicability.

The utility model discloses an acoustic test model and an acoustic test system for conformally attaching an acoustic material. The acoustic test model for conformally attaching the acoustic material comprises a sealing assembly; the sealing assembly comprises a plurality of shells, the shells are sequentially connected and define a sealing cavity, an acoustic material is arranged on the outer wall of at least one of the shells, in the acoustic testing process, the sealing assembly is connected with driving equipment, and the driving equipment drives the sealing assembly to rotate with the axis of the sealing assembly as the center.

The embodiment of the invention provides a sound box configuration optimization method, and the method comprises the steps: controlling a sound box to play a plurality of groups of test sounds, and controlling an audio collection device to receive the plurality of groups of test sounds; acquiring multiple groups of sound wave data corresponding to the multiple groups of test sounds from audio acquisition equipment; according to the multiple groups of sound wave data, determining an acoustic test result; and generating recommended adjustment parameters of the sound box in response to the fact that the acoustic test result does not meet the preset condition.

The utility model discloses a loudspeaker test tool, which comprises a tool main body, a cover plate and a volume block, the tool main body is provided with a positioning groove for accommodating a loudspeaker, and the tool main body is also provided with a test hole communicated with the positioning groove; the cover plate is movably arranged on the positioning groove in a covering manner; and the volume block is arranged in the positioning groove. According to the loudspeaker test tool, the positioning groove is used for placing the loudspeaker to be tested, the test hole is arranged corresponding to the sound production part of the loudspeaker to be tested, and after the cover plate covers the positioning groove, an operator can utilize acoustic test equipment to collect audio signals generated by the loudspeaker at the test hole. Wherein the positioning groove simulates the rear cavity of the loudspeaker module in the testing process, and the volume blocks with the corresponding number or shape are arranged in the positioning groove, so that the rear cavities of the loudspeaker modules with different models can be simulated, and the performance parameters of the loudspeaker in the different rear cavities can be tested, and therefore, the applicability of the loudspeaker testing tool is improved, and the equipment cost is reduced.

The utility model discloses an acoustic array underwater automatic rotation device, which relates to the technical field of acoustic testing, and comprises an N-shaped support, a connecting plate, an electric control box, an operation panel and a transverse rolling force module, the N-shaped support is provided with a transverse rolling support, the connecting plate is provided with a stainless steel bearing, and the transverse rolling force module is provided with a transverse rolling force module. The connecting plate is rotatably connected with the transverse rolling support through a stainless steel bearing, an XY translation mechanism is arranged at the top of the N-shaped support, the XY translation mechanism is composed of two electric push rods arranged in the XY direction, and mounting plates are arranged at the extending ends of the two electric push rods. When the automatic rotation device is used, a product to be tested is only required to be clamped once, rotation actions of all angles to be tested of the acoustic array can be completed under the control of a system, the labor intensity of workers is reduced, the loading and unloading time of the product to be tested is saved, the test efficiency is improved, and the automatic rotation device is high in applicability, universal for various types of products and high in overall practicability.

The present application belongs to the technical field of oil and gas drilling, and particularly relates to a multiphase fluid acoustic and electric testing device and method for drilling overflow simulation. The device is characterized in that: a multifunctional interface integrated on the upper part of the pressure-resistant reaction kettle cylinder is used to complete the injection of different component multiphase fluids and pressure setting; a heating jacket is used to complete the setting of a predetermined temperature; and continuous stirring is used to make the multiphase fluid reach a stable state with uniform composition. Under the conditions of a set temperature and pressure, electrical and acoustic signals are collected to analyze the multiphase fluid. The electrical testing component distinguishes different fluid components by monitoring the changes of resistance and dielectric constant; and the acoustic monitoring component detects the content of bubbles in the fluid through acoustic signals. The acoustic and electric cooperative monitoring can effectively distinguish different overflow types such as gas invasion, oil invasion and water invasion, and overcome the limitations of single monitoring method, thereby providing a reliable technical means for the mechanism research and practical application of downhole overflow monitoring.

This utility model discloses a support and acoustic testing system used inside an anechoic chamber. The support includes a telescopic rod, a linkage mechanism, and a tray. The telescopic rod has a fixed rod and a movable rod that are slidably engaged. One end of the fixed rod is provided with a fixing part for fixed connection with the side wall of the anechoic chamber. The linkage mechanism includes a guide rod fixedly connected to the movable rod, a swing rod hinged to the guide rod, and a push rod diagonally supported between the guide rod and the swing rod. One end of the push rod is hinged to the swing rod, and the other end is hinged to a slider slidably disposed on the guide rod. The slider is provided with a locking element for locking the slider. The tray is used to place the test object for acoustic testing, and the bottom of the tray is connected to the swing rod. The support of this utility model can easily adjust the position of the test object inside the anechoic chamber, thereby improving the efficiency of acoustic testing.

The invention relates to the technical field of surrounding rock blasting vibration reduction, and discloses a vibration reduction method and system for surrounding rock blasting under complex geological conditions, which are used for solving the problems of surrounding rock instability, structure damage and the like caused by blasting vibration in complex geological environments. The method comprises the following steps: 1) geological investigation and risk grading: acquiring parameters by using geological radar, drilling sound wave test and the like, and dividing risk areas; (2) blasting parameters are optimized, and the explosive loading amount, delay time and the like are adjusted according to different risk areas; (3) a vibration reduction scheme is formulated, and measures such as damping grooves, rubber pads and grouting reinforcement are adopted; and 4) monitoring feedback, collecting vibration data in real time and correcting the scheme. The system is composed of a control center, a geological survey module, a parameter design module, a vibration reduction arrangement module and a monitoring feedback module, and vibration reduction control is achieved. Through geological accurate pre-judgment, parameter dynamic optimization and multi-dimensional vibration reduction, the blasting vibration influence is reduced, the safety of surrounding rock and surrounding structures is guaranteed, and the method is suitable for engineering scenes such as tunnel excavation and mining.

A modular adjustable fixing device for an underwater acoustic transducer array includes a main support rod, a central structural component, a transducer fixing ring, and a sliding connector. One end of the main support rod is fixedly connected to the interior of the central structural component through three sets of square holes. The other end extends to form a Y-shaped array frame. The extended end of the main support rod is used to fix the transducer fixing ring, which is fixed to the main support rod by the sliding connector and suspended from the rear side of the central structural component. The sliding connector is slidably fitted onto the main support rod and positioned by fasteners, with its end connected to the transducer fixing ring. The central transducer fixing ring is fixed to the top of the central structural component. This invention allows for flexible adjustment of the baseline length of the underwater acoustic transducer array by adjusting the position of the sliding connector, meeting the acoustic testing requirements of different array models. Furthermore, its modular design facilitates easy disassembly and is suitable for stable fixing of transducer arrays in complex aquatic environments.

The utility model relates to the technical field of earphone product testing, in particular to an MIC hole plugging mechanism for testing acoustoelectric products, which comprises a fixing plate, EVA sponge is adhered and fixed on the surface of the fixing plate, and the EVA sponge is used for weakening interference generated by movement collision of the whole mechanism; the pneumatic modules are installed at the two ends of the top of the fixing plate, each pneumatic module is composed of two sets of installation frames, a transverse moving air cylinder and a transverse moving plate, the two sets of installation frames penetrate through the EVA sponge and are fixedly connected to the two ends of the fixing plate, and the transverse moving air cylinders are fixed to the surfaces of the installation frames; a transverse moving plate is mounted at the output end of the transverse moving cylinder; and a hole plugging module is mounted on the surface of the transverse moving plate and is used for plugging a hole of a product earphone. The utility model has the characteristics that the design is exquisite, the damping design accords with the acoustic test, the hole plugging head is simple and convenient to replace, the compatibility is strong, and the cost performance is high.

The utility model belongs to the technical field of uplift engineering pile design, and particularly relates to a combined structure cast-in-situ bored uplift pile combined with an angle steel latticed column, which comprises a cast-in-situ bored uplift pile structure and an angle steel latticed column structure. The cast-in-situ bored uplift pile structure comprises a cast-in-situ bored pile body and a reinforcement cage arranged in the cast-in-situ bored pile body. The reinforcement cage comprises an outer stirrup structure, a reinforcing rib structure, a longitudinal stress rib structure and a sounding structure used for detecting the integrity of a pile body. The angle steel latticed column structure is inserted into a reinforcement cage of the cast-in-situ bored uplift pile structure and comprises an angle steel latticed column and a stud structure, and the angle steel latticed column and the longitudinal stress rib structure are combined to resist uplift. The internal reinforcement cage of the uplift pile and the inserted steel structure are considered together to form a combined structure for resisting uplift, and compared with a traditional uplift pile which only depends on the internal reinforcement cage for resisting uplift, the uplift pile has the advantages that the reinforcement quantity of the reinforcement cage is remarkably reduced, the construction difficulty is reduced under the same condition, and the pile diameter and the engineering quantity are reduced.

One or more aspects of the present disclosure are directed to fixturing mechanisms for placement of battery cells inside an ultrasonic testing system. The disclosed fixturing mechanisms enable accurate and predictable loading, placement, and unloading of battery cells inside ultrasonic testing systems allowing all faces of battery cells of different types (e.g., pouch cells, prismatic cells, cylindrical cells, etc.) to have sufficient exposure to transmission and reception of acoustic signals. This fixturing mechanism furthers the goal of providing a robustly designed ultrasonic test system and producing accurate inspection results for batteries.

The application discloses a hydrogen-induced cracking acoustic testing system and method, which comprises an electrochemical environment simulation device, a stress loading device, a temperature loading device, an acoustic emission testing device and a control device. The electrochemical environment simulation device is internally provided with a test piece and is used for providing a corrosion environment required by hydrogen-induced cracking testing. The stress loading device and the temperature loading device are used for providing specified load force and temperature required by testing. The acoustic emission testing device is used for recording acoustic emission signals generated after starting hydrogen-induced cracking testing under the conditions of the specified load force and the temperature. The control device is used for starting the electrochemical environment simulation device and the acoustic emission testing device when the stress loading device and the temperature loading device respectively reach the corresponding specified load force and temperature, and receiving the acoustic emission signals, so as to analyze the evolution law of hydrogen-induced cracking of the test piece material. The application truly simulates the working condition of the hydrogen-induced cracking process of the test piece material, studies the hydrogen-induced cracking performance of the material, and improves the accuracy and reliability of the experimental results.

The invention provides a sound wave testing device and testing method suitable for an ultra-low-speed rock-soil mass, and relates to the technical field of in-hole rock mass sound wave testing, the device comprises a testing probe and a medium storage device, the testing probe comprises a plurality of vibration pickups and an elastic straight tube capsule, the vibration pickups are sequentially connected through high-strength thin wires, and the elastic straight tube capsule sleeves the vibration pickups; one end of the elastic straight-barrel capsule is connected with a second plugging piece which is internally provided with a liquid flow meter, the second plugging piece is communicated with one end of the medium storage device through a hydraulic quick connector, and the other end of the elastic straight-barrel capsule is connected with a first plugging piece which is internally provided with a micro water pump; rubber protection rings are arranged at the joints of the elastic straight-barrel capsule and the first plugging piece and the second plugging piece; a water inlet pipe and a water outlet of the micro water pump are arranged in the elastic straight-barrel capsule; a first hollow pipe is arranged at the other end of the medium storage device and is used for injecting a supersaturated low-speed solution or gas into the test probe and the medium storage device. The low-speed longitudinal wave of the rock mass can be obtained more accurately.

The utility model discloses an intelligent rotary table for acoustic testing, which comprises a lower support, a sliding table is arranged on the lower support, a rotary table base is arranged in the sliding table through a lead screw, a rotary table body is rotatably arranged at the upper part in the rotary table base through a second rotating shaft, and the outer side of a first rotating shaft is in transmission connection with a first motor through a first gear set. The rotary table base is arranged on the upper portion of the sliding table in a sliding mode through the lead screw, the two ends of the sliding table are fixedly installed on the detection table through the first rotating shaft and the lower support, and therefore the lead screw can drive the rotary table body on the upper portion of the rotary table base to move linearly to be adjusted. And one end of the second rotating shaft is in transmission connection with a second motor through a second gear set, so that the second motor and the second gear set drive the second rotating shaft to rotate and adjust, and the rotary table body can be horizontally rotated, adjusted and used, thereby meeting acoustic test use treatment at different straight lines and horizontal positions, and being high in test efficiency and convenient and fast to operate and control.

The invention discloses a sleep aiding cabin sound insulation test system and method based on multi-source data analysis, and relates to the technical field of sleep aiding cabin acoustic tests.According to the sleep aiding cabin sound insulation test system and method, characteristic environment parameters and characteristic coordinate points corresponding to sound pressure parameters are obtained, and sound pressure parameters of the characteristic environment parameters and the characteristic coordinate points are obtained according to the sound pressure parameters of the characteristic environment parameters and the characteristic coordinate points; calculating to obtain sound ring parameters of the characteristic coordinate points, calculating to obtain sound vibration parameters of the characteristic coordinate points according to sound vibration transmission ratios and vibration energy of the characteristic coordinate points, calculating to obtain sound engineering parameters according to the working condition scores and sound pressure parameters of the characteristic coordinate points, and calculating to obtain health scores; calculating to obtain a health score threshold range, training by constructing an abnormal data set, and generating an abnormal duration prediction formula; and according to the real-time data of the current work, whether a worker needs to carry out maintenance is judged, and the duration of next maintenance is calculated, so that efficient maintenance management is realized, and a guarantee is provided for equipment operation.

The present invention discloses an acoustic testing system and method for metal pitting corrosion, comprising: a corrosion environment simulation device for providing the corrosion environment required for testing; a stress environment simulation device for providing an internal stress environment under a first type of temperature condition to a test piece during testing; an acoustic emission detection device and an image acquisition device for respectively collecting acoustic emission signals and test images representing the changing state of the test piece's pitting corrosion process during testing; and an information processing device for synchronously acquiring the acoustic emission signals and test images. Based on these signals, information integration and analysis are performed on the pitting corrosion change process of the test piece under the combined conditions of different temperatures, different corrosion intensities, and different stress environments to obtain corresponding analysis results. The system of the present invention can simultaneously observe the influence mechanism of different temperatures, different pitting pit shapes, different stress magnitudes, and different corrosion intensities on the pitting corrosion damage of the test piece, providing a basis for material selection and real-time detection of high-temperature special equipment.

The invention provides an active compensation sound transmission method and device based on an actual installation environment of a sound transmission screen, and the method comprises the steps: obtaining a to-be-played audio corresponding to a target sound transmission screen in the actual installation environment; selecting a corresponding target audio compensation value from a target compensation parameter table; performing pre-compensation processing on the to-be-played audio to obtain a pre-compensated audio; playing the pre-compensated audio through a loudspeaker; wherein the actual audio obtained after the pre-compensation audio passes through the target sound transmission screen has the same audio characteristic as the audio to be played. According to the mode, the target audio compensation value corresponding to the to-be-played audio is selected from the target compensation parameter table and is compensated, and the target compensation parameter table integrates the reference attenuation table measured in the standard acoustic test environment and the environment compensation increment table measured in the actual installation environment, so that the accuracy of the target audio compensation value is improved. The influence of the actual installation environment is comprehensively considered, and the pre-compensation audio is played through the target sound transmission screen, so that the auditory effect of the audience side after the sound penetrates through the screen can be improved.

The utility model relates to the field of buildings, in particular to a non-destructive testing device for the pile forming quality of a secant pile, which comprises four steel pipes embedded around the secant pile and a supporting seat, a placing platform is erected at the top of the supporting seat, and corresponding first motors are arranged at the positions, opposite to the steel pipes, of the placing platform. According to the utility model, the supporting seat is erected above the steel pipe, and then the controller connected with the first motor is used for controlling the first motor to drive the take-up roller to rotate so as to slowly lay down the detection line, so that the ultrasonic detection probe is lowered to enter the steel pipe for sound wave detection; in the detection process, whether the secant pile is broken or not is checked by feeding back the detection line to the detector, the secant pile needs to be knocked to achieve sound wave detection in the detection process, in this way, it is not needed to conduct core drilling to check the internal situation of the secant pile, and nondestructive testing is achieved.

The application discloses a casing coking abnormal flow sound testing device and testing method. The device is used for collecting acoustic emission signals of coking abnormal flow sound waves in different size casings under different flow rates through simulation. The device comprises a gas conveying unit, a flow rate control unit and a casing coking simulation unit. The gas conveying unit is used for providing gas flow to simulate fluid in actual working conditions. The flow rate control unit adjusts the flow of the gas flow to simulate different flow rates of the gas flow. The casing coking simulation unit is provided with casings with different diameters of inner pipes at the end of a gas conveying pipeline. The outer wall and / or the inner wall of the inner pipe is adhered with coking materials to simulate coking conditions in the casings. A wave guiding sensing unit guides acoustic emission signals of simulated coking positions to the outside of the casings and collects the acoustic emission signals. The device and the method can be used for acoustic testing of casings with different sizes and different coking materials under different flow rates, and provide a basis for identifying coking abnormal flow sound signals of casings with different sizes under different flow rates.

The application relates to the technical field of phase change material research, and discloses an acoustic characterization equipment for detecting structural characteristics of phase change materials, which comprises a sample, a test reaction kettle, an acoustic test assembly, a temperature control assembly, a pressure control assembly and a data acquisition assembly; wherein the sample is in a cylindrical structure, the outer side of which is wrapped with three layers of latex film and one layer of tin paper; the test reaction kettle comprises a reaction kettle shell and a reaction kettle base; the acoustic test assembly is provided with two groups, which are installed at the upper and lower ends of the sample and used for emitting acoustic waves with different frequencies so as to obtain the attenuation characteristics and internal structural characteristics of the test material. The application realizes the preparation and acoustic test of phase change materials with different structures under different temperature and pressure conditions. Compared with other equipment, the equipment can not only realize the acoustic test of the phase change process of the phase change material under high net confining pressure, but also can carry out acoustic tests with frequency changes and different waveforms without replacing the acoustic probe.

This utility model discloses an acoustic testing system for a directional sound-emitting device, including an audio analyzer, an audio processing unit, a power amplifier, a transformer unit, a DC power supply, and a pickup unit. The audio analyzer provides audio, which is then processed as a digital audio signal by the audio processing unit. The processed audio is amplified by the power amplifier, and after exiting the power amplifier, it is amplified again by the transformer. With the DC bias provided by the DC power supply, it is then connected to the directional sound-emitting device under test. The sound emitted by the directional sound-emitting device is received by the pickup unit and returned to the audio analyzer, which displays the frequency response and distortion curves. This utility model provides a novel acoustic testing platform that enables rapid testing of the acoustic performance of directional sound-emitting devices.

An embodiment provides a method for acoustically testing at least one MEMS device among a plurality of MEMS devices. The method includes providing at least one MEMS device. Furthermore, the method includes exciting the at least one MEMS device to generate acoustic vibrations. Furthermore, the method includes detecting the acoustic vibrations of the at least one MEMS device via at least one acoustic sensor. Furthermore, the method includes evaluating the acoustic vibrations of the at least one MEMS device detected by the at least one acoustic sensor to test the at least one MEMS device for target functionality.

The invention discloses a compressor-turbine system complex noise separation method and device based on working condition comparison, and aims to achieve accurate separation and recognition of turbine aerodynamic noise. The method comprises the steps that a test system comprising a single-stage axial flow turbine is constructed, and a total noise signal and a corresponding rotating speed under the working condition of the turbine are collected; removing the turbine model part, constructing a non-turbine blank contrast working condition, keeping an airflow system consistent, and measuring a background airflow noise signal; performing spectral analysis on the noise signals under the turbine working condition and the turbine-free working condition respectively, and calculating a sound pressure level difference value at a corresponding frequency; aerodynamic noise generated by turbine rotation is separated according to the sound pressure level difference value; and repeatedly measuring and extracting a typical frequency peak value under a multi-rotating-speed working condition, and establishing a response relationship between the frequency and the turbine rotating speed, so as to construct a turbine characteristic noise database and realize noise identification and quantitative separation. The invention relates to the technical field of aero-engine aeroacoustic testing.

The invention discloses an adjustable white noise generation device and method based on a shift register, and the device comprises the following modules: a noise sequence generation module which is used for generating a random number sequence; the digital-to-analog conversion module is used for converting the sequence into an analog white noise signal; the programmable filtering module is used for suppressing high-frequency noise; the dynamic modulation module is used for adapting to different interference environment requirements; the output interface module is used for connecting and outputting an interference signal; the low-power-consumption management module is used for managing energy consumption; the beneficial effects of the invention are that according to the technical scheme, low-cost white noise generation is realized by using the single-chip microcomputer, the output frequency spectrum can be dynamically adjusted through software, directional sound source access and low-power-consumption management are supported, the application range is effectively enhanced, and the reliability is high. Noise output by the white noise generating device can be used for acoustic testing, pickup interference, equipment anti-interference evaluation and the like.

Provided is a hand emulator and an acoustic testing system. The hand emulator includes: a main support configured to support a device under test, the main support includes a palm, a thumb, an index finger, a middle finger, a ring finger and a little finger that are movably arranged at an end of the palm; a stopper including a plurality of limit pillars, at least some of the plurality of limit pillars are arranged on the palm, several limit pillars of the plurality of limit pillars enclose to form an accommodating space, and the device under test is limited within the accommodating space. The hand emulator can measure the frequency response of the speaker and / or the microphone of the device under test, emulate acoustic characteristics similar to the user's hand, and accurately and repetitively position the device under test, which improves existing measurement standards and creates new testing methods.