阅读说明：本技术 一种带轴向可调节匀强磁场加载装置的声学测量系统 (A kind of acoustic measurement system of the axially adjustable uniform magnetic field loading device of band ) 是由 吴卫国 杭锐 曾天成 于 2019-07-18 设计创作，主要内容包括：本发明涉及阻抗管隔声测试技术领域,具体为一种带轴向可调节匀强磁场加载装置的声学测量系统。由阻抗管测量系统和轴向可调节匀强磁场加载装置组成。其中轴向可调节匀强磁场加载装置的两端与阻抗管测量系统的前管后端和后管前端相连接,置于前管和后管之间,并与前管和后管轴向同心。阻抗管测量系统的前管和后管上表面布置有6个声传感器,用于接收声信号。通电后可在圆柱管内产生轴向匀强磁场,磁场大小通过输入电流定量控制,同时圆柱管作为摆放待测试件的试件管。本发明能够在保证实验测量精度的前提下,提供实验所需的可调节匀强磁场测试环境。(The present invention relates to impedance tube sound insulation measurement technical field, the acoustic measurement system of specially a kind of axially adjustable uniform magnetic field loading device of band.It is made of impedance tube measuring system and axially adjustable uniform magnetic field loading device.Wherein the both ends of axially adjustable uniform magnetic field loading device are connected with the front tube rear end of impedance tube measuring system and rear pipe front end, are placed between front and rear tube, and axially concentric with front and rear tube.The front and rear tube upper surface of impedance tube measuring system is disposed with 6 sonic transducers, for receiving acoustical signal.Axial uniform magnetic field can be generated after energization in cylindrical tube, magnetic field size is quantitatively controlled by input current, while cylindrical tube is as the test specimen pipe for putting test specimen to be measured.The present invention can be under the premise of guaranteeing to test measurement accuracy, adjustable uniform magnetic field test environment needed for providing experiment.)

1. a kind of acoustic measurement system of the axially adjustable uniform magnetic field loading device of band, which is characterized in that the acoustic measurement System is made of impedance tube measuring system and axially adjustable uniform magnetic field loading device；Wherein axially adjustable uniform magnetic field adds The front tube rear end and rear pipe front end for carrying the both ends and impedance tube measuring system set are connected, and are placed between front and rear tube, and Axially concentric with front and rear tube, impedance tube measuring system sound source is installed on the front end of impedance tube measuring system front tube；It axially can Uniform magnetic field loading device is adjusted to be made of cylindrical tube, coil baffle, enamel covered wire circle and DC power supply；Enamel covered wire circle is equal Be wound in cylindrical tube evenly, when coiling at the beginning and end of all reserve enamel covered wire circle, for connecting direct current Source；Cylindrical tube both ends are provided with coil baffle, and coil can generate uniform magnetic field after being passed through electric current in cylindrical tube, defeated by changing The intensity adjustment magnetic field for entering electric current is strong and weak, sound insulation property variation of the test test specimen under the effect of axial uniform magnetic field；Cylinder simultaneously Pipe is pushed into cylindrical tube as the test specimen pipe for putting test specimen to be measured, the piston rod of test specimen to be measured scale with a scale.

2. a kind of acoustic measurement system of the axially adjustable uniform magnetic field loading device of band as described in claim 1, feature It is, the long front and rear tube of impedance tube measuring system is all 800mm, and surface layout there are 6 sonic transducers on it, is used for Acoustical signal is received, first sensor is located at the 5mm of front tube rear end, and second sensor is located at 8mm before first sensor, and third passes Sensor is located at 22mm before second sensor, and after the 4th sensor is located at the 15mm of pipe front end, the 5th sensor is located at the 4th and passes 8mm behind sensor, the 6th sensor are located at 22mm behind the 5th sensor, guarantee that 6 sensors are generally aligned in the same plane and one On straight line.

3. a kind of acoustic measurement system of the axially adjustable uniform magnetic field loading device of band as described in claim 1, feature It is, the graduated scale on piston rod can clearly represent the specific location that test specimen to be measured is located in cylindrical tube, i.e. graduated scale Display how much, test specimen be just pushed into cylindrical tube how long distance；Graduated scale is installed on the surface of piston rod, guarantees scale direction and work The end face of stopper rod is vertical, and when pushing piston rod, scale position will not change.

4. a kind of acoustic measurement system of the axially adjustable uniform magnetic field loading device of band as described in claim 1, feature It is, the cylindrical tube is made of aluminum；The cylinder bore and the inside radius r of impedance tube measuring system are consistent, Outer diameter and the outer radius R of impedance tube measuring system are consistent, and length should be greater than 4r；Before cylindrical tube and impedance tube measuring system The connection of pipe and rear pipe can be used screw thread or snap connection mode, need to guarantee that interface fits closely and axial direction is concentric after connection.

5. a kind of acoustic measurement system of the axially adjustable uniform magnetic field loading device of band as described in claim 1, feature It is, the enamel covered wire and DC power supply select the enameled wire and different capacity of different line footpaths according to required magnetic field size DC power supply；The enamel covered wire circle is often coated around one layer with insulating tape in coiling, it is reserved to and DC power supply One section of enameled wire of connection is wrapped up with insulating gum cover；The long 500mm of enamel covered wire circle reserved.

6. a kind of acoustic measurement system of the axially adjustable uniform magnetic field loading device of band as described in claim 1, feature It is, the coil baffle outer edge should be higher than that, around the enamel covered wire circle outermost made, the thickness of coil baffle guarantees It is indeformable in enamel covered wire circle winding process and in experimentation；The coil baffle is made of nylon material.

7. a kind of acoustic measurement system of the axially adjustable uniform magnetic field loading device of band as described in claim 1, feature It is, the connection use between the coil baffle and cylindrical tube is threadedly coupled or the modes such as glue connection.

8. a kind of acoustic measurement system of the axially adjustable uniform magnetic field loading device of band as described in claim 1, feature It is, to guarantee during test specimen to be measured is pushed into cylindrical tube not by effects of air pressure, the piston rod band of the scale with a scale There is deflector hole, the position of deflector hole is located at the front end face center that piston rod is contacted with test specimen and through entire piston rod；For After guaranteeing test specimen push-in cylindrical tube to be measured, surface is vertical with plane wave, that is, when guaranteeing that test specimen to be measured is vertical, and guaranteeing push-in It is smooth, the piston rod radius of scale with a scale is less than r greater than 0.8r, and piston rod front end is using indent design；Mark with a scale The piston rod of ruler is made of nylon material.

Technical field

The present invention relates to impedance tube sound insulation measurement technical field, specially a kind of axially adjustable uniform magnetic field load dress of band The acoustic measurement system set.

Background technique

In modern society, noise is not only in the every field such as industry, aviation and traffic railway, to the instrument in its field Device, equipment etc. bring serious security risk, and have seriously affected the daily work life of people.Traditional passive type sound insulation Material once prepares completion, and equivalent parameters is fixed, and sound insulation frequency range is relatively narrow.Complicated acoustics is faced in order to enhance sound insulating material The adaptability of environment, with magnetorheological equal materials and all kinds of active sound insulating materials based on magnetic field control are fast-developing, this kind of Sound insulation experiment of the active sound insulating material under magnetic fields becomes one of problem to be solved.

Currently, one is annular permanent magnet is placed on resistance in impedance tube sound insulation experiment there are mainly three types of the loading methods of magnetic field Anti- pipe, but this form magnetic field strength can not be adjusted effectively；Second is by electromagnetic field loading device and active sound insulating material one It is same to be placed in impedance tube, on the one hand, conducting wire can not be drawn from impedance tube, and on the other hand, conducting wire is present in impedance tube, is to be measured Test specimen periphery will certainly interfere the propagation of impedance tube inner plane wave, to produce a very large impact to sound insulation experiment；The third is straight It connects the wound around coil on the outside of impedance tube and forms magnetic field loading device, since impedance tube acoustic sensor is closer from test specimen to be measured, around The magnetic field and electric heating that the coil of system generates after being powered can produce bigger effect transducer sensitivity, and then influence sound insulation experiment Measurement accuracy, and be inconvenient to test specimen of taking.

Summary of the invention

The present invention provides a kind of acoustic measurement systems of the axially adjustable uniform magnetic field loading device of band, by quantitatively changing Become input current, uniform magnetic field rate of loading is adjusted, to reach the sound insulation requirement of experiment of active sound insulating material.

The technical scheme is that a kind of acoustic measurement system of the axially adjustable uniform magnetic field loading device of band, by Impedance tube measuring system and axially adjustable uniform magnetic field loading device composition.Wherein axially adjustable uniform magnetic field loading device Both ends be connected with the front tube rear end of impedance tube measuring system and rear pipe front end, be placed between front and rear tube, and and front tube It is axially concentric with rear pipe.Wherein, it is all 800mm that the front and rear tube of impedance tube measuring system is long, and surface layout has 6 on it A sonic transducer, for receiving acoustical signal, first sensor is located at the 5mm of front tube rear end, and second sensor is located at the first sensing 8mm before device, 3rd sensor are located at 22mm before second sensor, after the 4th sensor is located at the 15mm of pipe front end, the 5th Sensor is located at 8mm behind the 4th sensor, and the 6th sensor is located at 22mm behind the 5th sensor, guarantees 6 sensor positions In same plane and point-blank, specific installation site is as shown in Fig. 1.Impedance tube measuring system sound source is installed on resistance The front end of anti-pipe measuring system front tube.

Wherein, axially adjustable uniform magnetic field loading device is by cylindrical tube, coil baffle, enamel covered wire circle and direct current Source composition；Enamel covered wire circle is equably wound in cylindrical tube, when coiling at the beginning and end of all reserve 500mm long Enamel covered wire circle, for connecting DC power supply；Cylindrical tube both ends are provided with coil baffle, and coil can be in cylinder after being passed through electric current Uniform magnetic field is generated in pipe, can be strong and weak by changing the intensity adjustment magnetic field of input current, while cylindrical tube is to be measured as putting The piston rod of the test specimen pipe of test specimen, test specimen to be measured scale with a scale is pushed into cylindrical tube.Wherein, the graduated scale on piston rod can be with Clearly represent the specific location that test specimen to be measured is located in cylindrical tube, i.e., graduated scale show how much, test specimen is just pushed into cylinder Pipe how long distance.Graduated scale is installed on the surface of piston rod, guarantees that scale direction is vertical with the end face of piston rod, and live pushing When stopper rod, scale position will not change.

In above scheme, the cylinder bore and the inside radius r of impedance tube measuring system are consistent, outer diameter and resistance The outer radius R of anti-pipe measuring system is consistent, and length should be greater than 4r.The front and rear tube of cylindrical tube and impedance tube measuring system Connection the connection types such as screw thread or buckle can be used, need to guarantee after connection interface fit closely and it is axial with one heart.

Further, not influence Distribution of Magnetic Field, the cylindrical tube is made of weak magnetic materials such as aluminium.

In above scheme, the enamel covered wire and DC power supply select the enamel-cover of different line footpaths according to required magnetic field size The DC power supply of line and different capacity.

Further, the lesser enamel covered wire of line footpath can the more the number of turns of coiling, but resistance is larger, needs to select power at this time Biggish DC power supply proposes requirements at the higher level to experimental facilities；The biggish enamel covered wire coiling the number of turns of line footpath is less, resistance compared with It is small, larger current can be passed through to guarantee magnetic field strength, but this mode can generate larger electric heating.

Further, the enamel covered wire circle is often coated around one layer with insulating tape in coiling, it is reserved to One section of enameled wire of DC power supply connection is wrapped up with insulating gum cover.

In above scheme, the coil baffle outer edge be should be higher than that around the enamel covered wire circle outermost made, coil gear The thickness of plate guarantees indeformable in enamel covered wire circle winding process and in experimentation.

Further, the coil baffle is made of nylon material.

Further, the side such as threaded connection or glue connection can be used in the connection between the coil baffle and cylindrical tube Formula.

In above scheme, to guarantee that during test specimen to be measured is pushed into cylindrical tube, described is with a scale not by effects of air pressure The piston rod of scale has deflector hole, and the position of deflector hole is located at the front end face center that piston rod is contacted with test specimen and runs through Entire piston rod.

Further, after to guarantee that test specimen to be measured is pushed into cylindrical tube, surface is vertical with plane wave, that is, guarantees test specimen to be measured Vertically, smooth when and guarantee is pushed into, the piston rod radius of scale with a scale is less than r greater than 0.8r, and piston rod front end is adopted It is designed with indent.

Further, the piston rod of scale with a scale can be used the materials such as nylon and be made.

The invention has the following advantages that

1, it can be realized uniform magnetic field load, magnetic field strength can quantitatively be adjusted by input current；

2, coil winding solves the problems, such as that conducting wire influences sound insulation measurement in impedance tube measuring system on the outside of cylindrical tube；

3, one section of cylindrical tube is increased, so that enamel covered wire circle range sensor is farther out, avoids in experiment magnetic field and electric heating to biography The influence of sensor.

Detailed description of the invention

Fig. 1 is the acoustic measurement system with axially adjustable uniform magnetic field loading device.

Fig. 2 cylindrical tube.

The axially adjustable uniform magnetic field loading device of Fig. 3.

The piston rod of Fig. 4 scale with a scale.

Fig. 5 simulates the Distribution of Magnetic Field of axially adjustable uniform magnetic field loading device.

Fig. 6 surveys Distribution of Magnetic Field in cylindrical tube inner axis.

Fig. 7 impedance tube measuring system transformation front and back test result.

Description of symbols: 1- impedance tube measuring system sound source；2- impedance tube measuring system front tube；3- sonic transducer connects Mouthful；The axially adjustable uniform magnetic field loading device of 4-；It is managed after 5- impedance tube measuring system；6- coil baffle；7- enamel covered wire circle； 8- graduated scale；9- deflector hole；First sensor is 3.；Second sensor is 2.；3rd sensor is 1.；4th sensor is 4.；5th Sensor is 5.；6th sensor is 6..

Specific embodiment

Specific embodiments of the present invention will be further explained with reference to the accompanying drawing.

Cylindrical tube inside radius r=50mm in the present embodiment, outer radius R=60mm, length l=210mm, by aluminium material system At seeing Fig. 2.

Enamel covered wire diameter is 1.2mm in the present embodiment, and coil turn is 1000 circles, and coil baffle is nylon material, thick Spend 3mm.

In the present embodiment cylindrical tube with impedance tube measuring system front and rear tube by the way of being threadedly coupled, after connection such as Shown in Fig. 1.

The present embodiment uses the " DC power supply of 60V, 60A ".

The piston rod of scale with a scale is nylon material in the present embodiment, sees Fig. 4.

In conjunction with Fig. 1, Fig. 2 and Fig. 3, step 1: two panels coil baffle is fixed on to the both ends of cylindrical tube with hot melt adhesive, it is fixed When avoid screw position, place a period of time after smearing hot melt adhesive, wait hot melt adhesive to dry out and strengthen；

Step 2: enamel covered wire is uniformly wound in cylindrical tube, between two panels coil baffle, when coiling, one layer of every coiling Coil coats one layer, after the completion of coiling with insulating tape, is uniformly coated on the outside of coil with insulating tape, the enamel-cover reserved Copper wire is wrapped up with insulating gum cover, to form axially adjustable uniform magnetic field loading device, as shown in Figure 3.

Step 3: cylindrical tube rear end is screwed in after impedance tube measuring system on pipe, then impedance tube measuring system front tube position is adjusted, Impedance tube measuring system front tube is connected with cylindrical tube front end, to form the sound with axially adjustable uniform magnetic field loading device Measuring system is learned, as shown in Figure 1.

In the present embodiment, enamel covered wire circle is passed through after electric current forms one section of axial uniform magnetic field in cylindrical tube, and magnetic field is strong Degree can quantitatively be controlled by the size of input current.

Axially adjustable uniform magnetic field loading device in the present embodiment is simulated defeated with COMSOLMultiphysics5.3a When entering 15A electric current, internal magnetic field distribution situation, as a result as shown in Figure 5.

From figure 5 it can be seen that in axially adjustable uniform magnetic field loading device pipe near central regions larger range Uniform magnetic field is generated, uniform magnetic field width is more than the half of pipe range, and magnetic field strength maximum is close to 0.11T in pipe inner axis.

Axially adjustable uniform magnetic field loading device in the present embodiment accesses DC power supply, 15A electric current is passed through, in cylinder A test point is taken every 20mm on pipe axis, takes 13 points altogether, with Gauss instrument actual measurement each point magnetic field strength, is drawn in pipe Magnetic field distribution curve is as shown in Figure 6 on axis.

From fig. 6 it can be seen that inner axial tube has a uniform magnetic field of nearly 100mm width range after being powered, it is whole and Speech, the range of uniform magnetic field can satisfy requirement of experiment.

The present embodiment carries out lengthening transformation to impedance tube measuring system, is complete from the working principle angle analysis of impedance tube It is feasible.

In the present embodiment, respectively by the same test specimen be packed into the impedance tube measuring system without magnetic field loading device in and tape spool It is taken multiple measurements into the impedance tube measuring system of adjustable uniform magnetic field loading device.Wherein without the resistance of magnetic field loading device The front and rear tube of anti-pipe measuring system is directly threadedly coupled；Impedance tube with axially adjustable uniform magnetic field loading device is surveyed Amount system then increases an axially adjustable uniform magnetic field loading device, is placed between front and rear tube, and with screw thread by axis It is connected to adjustable uniform magnetic field loading device with front tube, rear pipe.

When being packed into test specimen, for anti-leak-stopping sound, test specimen periphery is wound with unsintered tape, and spread vaseline.

The piston rod of test specimen scale with a scale as shown in Figure 4 is pushed into the improved axially adjustable uniform magnetic field of band In the impedance tube measuring system of loading device.

Every time experiment need to according to the physical location of test specimen in impedance tube measuring system software kit Va-Lab adjusting parameter.

Test results are shown in figure 7, it can be seen from the figure that the impedance before improved impedance tube measuring system and transformation Pipe measuring system measurement result consistency is very good, can satisfy requirement of experiment completely, and actual test shows to measure impedance tube The transformation of system will not influence the measuring accuracy of equipment, i.e., the improved method proposed by the present invention to impedance tube measuring system is can Capable.

In conjunction with the embodiments, the acoustic measurement system of the axially adjustable uniform magnetic field loading device of a kind of band proposed by the invention System, can be under the premise of guaranteeing measurement accuracy, adjustable uniform magnetic field test environment needed for providing experiment.

Above-mentioned is the preferred embodiment of the present invention, cannot function as full scope of the invention, with one kind of the present invention That is done on the basis of the acoustic measurement system with axially adjustable uniform magnetic field loading device any be significantly improved and simply become It changes and belongs to patent coverage area of the invention.