阅读说明：本技术 带可调谐径向磁场加载装置的声学测量系统 (Acoustic measurement system with tunable radial magnetic field loading device ) 是由 吴卫国 曾天成 刘闯 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,具体为带可调谐径向磁场加载装置的声学测量系统。其由阻抗管测量系统和可调谐径向磁场加载装置组成。其中,可调谐径向磁场加载装置由圆环框架、支撑架、线圈单元、锁紧螺母、绝缘垫圈和直流电源组成；可调谐径向磁场加载装置放置于阻抗管测量系统的外部,其产生的磁场平面与阻抗管测量系统的阻抗管轴线垂直,保证可调谐径向磁场加载装置的圆环框架与阻抗管同心,并且使线圈单元末端与阻抗管外表面的之间的距离控制在2mm以内,以实现径向磁场更好地作用于被测试件,同时可调谐径向磁场加载装置可沿着阻抗管轴向移动,可以实现在阻抗管任何位置加载径向磁场。(The present invention relates to impedance tube sound insulation measurement technical fields, specially the acoustic measurement system with tunable radial magnetic field loading device.It is made of impedance tube measuring system and tunable radial magnetic field loading device.Wherein, tunable radial magnetic field loading device is made of annulus frame, support frame, coil unit, locking nut, insulating washer and DC power supply；Tunable radial magnetic field loading device is placed in the outside of impedance tube measuring system, the H plane that it is generated is vertical with the impedance tube axis of impedance tube measuring system, guarantee that annulus frame and the impedance tube of tunable radial magnetic field loading device are concentric, and make coil unit end and impedance tube outer surface the distance between control within 2mm, to realize that radial magnetic field preferably acts on test specimen, tunable radial magnetic field loading device can be moved axially along impedance tube simultaneously, may be implemented in any position load radial magnetic field of impedance tube.)

1. the acoustic measurement system with tunable radial magnetic field loading device, which is characterized in that the tunable radial magnetic field of band The acoustic measurement system of loading device is made of impedance tube measuring system and tunable radial magnetic field loading device；Wherein, adjustable Humorous radial magnetic field loading device is made of annulus frame, support frame, coil unit, locking nut, insulating washer and DC power supply, Annulus frame vertical straight is placed on the support frame and is fixed with clamping screw, and it is 16- that 8 diameters are equably outputed on annulus frame The through-hole of 20mm needs to be symmetrically installed 2,4,6 or 8 coil units according to magnetic field load, coil unit by locking nut with Circular frame is connected and fixed, while being lined with insulating washer when connection between coil unit and circular frame, to prevent electric leakage When circular frame charge；Coil unit by reserve come copper enameled wire connect with DC power supply；Tunable radial magnetic field Loading device is placed in the outside of impedance tube measuring system, the impedance tube axis of the H plane and impedance tube measuring system that generate Line is vertical, guarantees that the annulus frame of tunable radial magnetic field loading device and impedance tube are concentric, and make coil unit end with Impedance tube outer surface the distance between control within 2mm, to realize that radial magnetic field preferably acts on test specimen, simultaneously Tunable radial magnetic field loading device can be moved axially along impedance tube, may be implemented to load radial magnetic in any position of impedance tube .

2. the acoustic measurement system as described in claim 1 with tunable radial magnetic field loading device, which is characterized in that described Coil unit be made of cylinder iron core, copper enameled wire and coil baffle；Wherein, in cylinder pure iron iron core one end tapping；Two Piece coil baffle is fixed on cylinder iron core with hot melt adhesive, and a period of time is placed after gluing, is waited hot melt adhesive to dry out and is strengthened, wherein For a piece of coil baffle apart from the threaded one end 70-80mm of cylinder iron core when fixed, another is fixed on cylinder iron core without spiral shell One end of line；Copper enameled wire is equably wound between two pieces of coil baffles, during coiling, often around one layer just with insulation Adhesive tape wraps up one layer, and coiling is wrapped up completely with insulating tape again after finishing, and finally reserves one section of copper enameled wire for connecting DC power supply；The coil unit of tunable radial magnetic field loading device has thus been made, need to only change the electric current of DC power supply Size, so that it may quantitatively tune the magnetic field strength of radial magnetic field.

3. the acoustic measurement system as described in claim 1 with tunable radial magnetic field loading device, which is characterized in that described Support frame by angle steel, rectangular slab and steering wheel group at；With 4 angle steel by rectangular slab prop up come, and by universal wheel be mounted in 4 angles On steel, guarantee that rectangular slab is in horizontality；In addition to this, the hole that a diameter is 10mm is bored in rectangular slab center, for solid Determine annulus frame, the support frame may be implemented to move under the action of universal wheel, then annulus frame also moves, in this way The loading position that radial magnetic field can be changed increases the variability of the acoustic measurement system radial magnetic field loading position；It is described Support frame be made of steel；Specific geometric parameter are as follows: angle steel: 30*30*3；Rectangular slab: long: 400mm, wide: 300mm is thick: 3mm。

4. the acoustic measurement system as described in claim 1 with tunable radial magnetic field loading device, which is characterized in that described Tunable radial magnetic field loading device annulus frame with support frame support fix, concrete operations are as follows: bored on annulus frame The threaded hole that one diameter is 10mm, the identical screw thread of a diameter is also bored in the position of the rectangle plane plate corresponding to support frame Hole, with clamping screw pass through annulus frame on threaded hole and support frame rectangle plane plate surface hole connect, then with lock Nut check is fixed；The annulus frame is made of aluminium；Specific geometric parameter are as follows: outer diameter 500mm, internal diameter 450mm, Wide 100mm.

5. the acoustic measurement system as claimed in claim 2 with tunable radial magnetic field loading device, which is characterized in that described Cylinder iron core be made of pure iron material, select solid cylinder iron core；Specific geometric parameter are as follows: diameter 20mm, length For 210mm, and in the screw thread of one end tapping M10 × 20mm, it to be used for fixed coil unit；The coil baffle is by nylon material Material is made, and the coil baffle outer edge should be higher than that around the copper enameled wire coil unit outer most edge made, the thickness of coil baffle Degree be subject to guarantee during coiling copper enameled wire and test during it is indeformable；The copper enameled wire is by pure copper material It is made；The diameter of copper enameled wire is 1.2mm.

6. the acoustic measurement system as described in claim 1 with tunable radial magnetic field loading device, which is characterized in that described Lock nut be M10 outer-hexagonal nut, be made of steel.

7. the acoustic measurement system as described in claim 1 with tunable radial magnetic field loading device, which is characterized in that described Insulating washer be made of epoxide resin material, be padded between cylinder iron core and annulus frame.

8. the acoustic measurement system as described in claim 1 with tunable radial magnetic field loading device, which is characterized in that described Tunable radial uniform magnetic field loading device caused by radial magnetic field act on the radial direction of test specimen, tunable diameter It is 0-15A to uniform magnetic field loading device input current size, the magnetic field strength of generated magnetic fields to test specimen is 0-0.5T。

Technical field

The present invention relates to impedance tube sound insulation measurement technical fields, specially the acoustics with tunable radial magnetic field loading device Measuring system.

Technical background

In the past 50 years, in modern society's life, with National Highway train, aerospace, large-scale project of transmitting and converting electricity etc. On the one hand fast development, noise problem affect the fast development in each field itself, on the other hand go back the normal of intruder people Work and life.The adaptation of complicated acoustic enviroment is faced in order to improve influence and the reinforcing material of noise on human normal life Property, with magnetorheological equal materials and based on all kinds of sound insulating materials fast development of magnetic field control, this kind of material is having externally-applied magnetic field Shown when effect can real-time change, good sound insulation property, then its sound insulation experiment under magnetic fields becomes and needs to solve One of problem, so urgently testing research of the acoustic measurement system with magnetic field loading device.

Currently, in impedance tube sound insulation experiment there are mainly three types of the loading methods of magnetic field.The first magnetic field loading method is by ring Shape permanent magnet is placed on impedance tube, but its magnetic field strength of this form is inadequate；Second of magnetic field loading method is to load magnetic field to fill It sets and is placed in impedance tube together with active sound insulating material, this mode has many influences to experiment, on the one hand, magnetic field loading device Conducting wire can not be drawn from impedance tube, it is difficult to realize that magnetic field accurately loads；On the other hand, the conducting wire meeting of magnetic field loading device In impedance tube or beside test specimen to be measured, the propagation of impedance tube inner plane wave can be interfered with, to generate to sound insulation experiment very big Influence, the experimental result of last test has certain deviation；The third magnetic field loading method is directly on the outside of impedance tube Wound around coil forms magnetic field loading device, and since impedance tube acoustic sensor is closer apart from test specimen to be measured, the coil of coiling is powered The magnetic field generated afterwards and electric heating can produce bigger effect acoustic sensor sensitivity, and then influence the measurement accuracy of sound insulation experiment With as a result, and being inconvenient to test specimen of taking.

Existing magnetic field loading device is mostly axial magnetic field loading device, and method is relatively simple in actual tests test, Mainly have following two points insufficient:

1. be unable to complete the radial loaded in magnetic field, magnetic field loading direction be only it is axially loaded,；

2. operating process is complicated, can not accomplish quantitatively to load.

Summary of the invention

The present invention provides the acoustic measurement systems with tunable radial magnetic field loading device, pass through quantitative change acoustics The input current size of tunable radial magnetic field loading device in measuring system tunes the intensity of loaded radial magnetic field, changes The actual parameter for becoming test specimen, to reach the requirement of experiment of test specimen sound insulation property.

The technical scheme is that the acoustic measurement system with tunable radial magnetic field loading device, is surveyed by impedance tube Amount system and tunable radial magnetic field loading device composition.Wherein, tunable radial magnetic field loading device is by annulus frame, support Frame, coil unit, locking nut, insulating washer and DC power supply composition；Tunable radial magnetic field loading device is placed in impedance The outside of pipe measuring system, the H plane generated is vertical with the impedance tube axis of impedance tube measuring system, guarantees tunable The annulus frame and impedance tube of radial magnetic field loading device are concentric, and make between coil unit end and impedance tube outer surface Distance controlling within 2mm, to realize that radial magnetic field preferably acts on test specimen, while tunable radial magnetic field loads Device can be moved axially along impedance tube, may be implemented in any position load radial magnetic field of impedance tube.

Wherein the technical solution of tunable radial magnetic field loading device is: the placement of annulus frame vertical straight is used in combination on the support frame Clamping screw is fixed, and the through-hole that 8 diameters are 16-20mm is equably outputed on annulus frame, can load needs according to magnetic field 2,4,6,8 coil units are symmetrically installed, coil unit is connected and fixed by locking nut and circular frame, while in coil list It is lined with insulating washer when connecting between member and circular frame, circular frame charges when to prevent electric leakage.Coil unit passes through The copper enameled wire come is reserved to connect with DC power supply.

In above scheme, the coil unit is made of cylinder iron core, copper enameled wire and coil baffle；Wherein, in circle Column pure iron iron core one end tapping M10 × 20mm long screw thread；Two panels coil baffle is fixed on cylinder iron core with hot melt adhesive, gluing A period of time is placed afterwards, waits hot melt adhesive to dry out and strengthens, wherein a piece of coil baffle has screw thread apart from cylinder iron core when fixed One end 70-80mm, another is fixed on the non-threaded one end of cylinder iron core；Copper enameled wire is equably wound on two pieces of coil gears Between plate, during coiling, one layer just often is wrapped up with insulating tape around one layer, coiling finishes later again with insulating tape packet It wraps up in completely, finally reserves one section of copper enameled wire for connecting DC power supply.Tunable radial magnetic field load has thus been made The coil unit of device.The size of current of DC power supply need to only be changed, so that it may quantitatively tune the magnetic field strength of radial magnetic field.

In above scheme, the support frame by angle steel, rectangular slab and steering wheel group at.Rectangular slab is supportted with 4 angle steel Get up, and by universal wheel on 4 angle steel, guarantees that rectangular slab is in horizontality.In addition to this, one is bored in rectangular slab center A diameter is the hole of 10mm, is used for clamping rings frame.The support frame may be implemented to move under the action of universal wheel.

In above scheme, the annulus frame of the tunable radial magnetic field loading device is supported with support frame to be fixed, tool Gymnastics as: the threaded hole that diameter is 10mm, the position of the rectangle plane plate corresponding to support frame are bored on annulus frame Also the identical threaded hole of a diameter is bored, the rectangle plane plate of the threaded hole and support frame on annulus frame is passed through with clamping screw The hole on surface connects, then is locked with locking nut.

In above scheme, the annulus frame is made of aluminium or other weak magnetic materials；Specific geometric parameter Are as follows: outer diameter 500mm, internal diameter 450mm, wide 100mm.

In above scheme, the support frame is made of steel；Specific geometric parameter are as follows: angle steel: 30*30*3；Rectangle Plate: long: 400mm, wide: 300mm is thick: 3mm.

In above scheme, the cylinder iron core is made of pure iron material；Specific geometric parameter are as follows: diameter 20mm, Length is 210mm, and in the screw thread of one end tapping M10 × 20mm, is used for fixed coil unit.

In above scheme, the lock nut is M10 outer-hexagonal nut, is made of steel.

In above scheme, the insulating washer is made of epoxide resin material, be padded on cylinder iron core and annulus frame it Between.

In above scheme, the coil baffle is made of nylon or other weak magnetic materials.

Further, the coil baffle outer edge should be higher than that around the copper enameled wire coil unit outer most edge made, line The thickness of circle baffle be subject to guarantee during coiling copper enameled wire and test during it is indeformable.

In above scheme, the copper enameled wire is made of pure copper material；The diameter of copper enameled wire is 1.2mm.

Further, the lesser copper enameled wire of diameter can the more the number of turns of coiling, but the electricity of the lesser copper enameled wire of diameter It hinders larger, needs to select the biggish DC power supply of power, the security performance of experimental facilities is required high；The copper enamel-cover being relatively large in diameter Line can coiling the number of turns it is less, resistance is smaller, larger current can be passed through to guarantee magnetic field strength, but electric current it is big can generate compared with Big heat influences the performance of test specimen.So needing to select the copper enameled wire of different-diameter according to actual needs.

In above scheme, the watt level of the DC power supply is selected according to the size of radial magnetic field intensity needed for testing It selects.

Further, hollow cylinder iron core is compared with solid cylinder iron core, and the magnetic field strength effect generated is bad, The magnetic field strength that solid core generates is stronger, and the present invention selects solid cylinder iron core.

In above scheme, during the copper enameled wire circle coiling to cylinder iron core, insulating cement is just often used around one layer One layer of band cladding finally reserves the one section of copper enameled wire come and is wrapped up with insulating gum cover, prevents from leaking electricity, guarantee test safety.

In above scheme, radial magnetic field caused by the tunable radial uniform magnetic field loading device acts on tested The radial direction of test specimen, tunable radial direction uniform magnetic field loading device input current size is 0-15A, generated magnetic fields Magnetic field strength to test specimen is 0-0.5T.

In above scheme, the support frame can move under the action of universal wheel, then annulus frame also moves, The loading position that radial magnetic field can thus be changed increases the variability of the acoustic measurement system radial magnetic field loading position.

The invention has the following advantages that

1. realizing radial loaded

For commonplace axial magnetic field loading device, apparatus of the present invention can generate radial magnetic field, act on tested The radial direction of test specimen can be used for testing the performance of the test specimen under radial magnetic field effect.

2. it is easy to operate, it is quantitative to load

The size that tunable radial uniform magnetic field loading device input current need to only be changed, can be directly changed the property of test specimen Can, to reach test requirements document.

3. radial forces load is uniform

It using 2,4,6,8 coil units, is uniformly fixed on annulus frame, during generating radial magnetic field, is tested Test specimen radial direction stress can be more uniformly.

4. magnetic field external load reduces the influence because of coil heating to test specimen performance and acoustic sensor.

Detailed description of the invention

Fig. 1 is the acoustic measurement system overall structure diagram of the invention with tunable radial magnetic field loading device；

Fig. 2 is tunable radial magnetic field loading device structural schematic diagram；

Fig. 3 is single coil cellular construction schematic diagram in tunable radial magnetic field loading device；

Fig. 4 is the magnetic field strength that magnetic field is generated after the tunable radial magnetic field loading device of 4 coil units powers on Distribution map；

Fig. 5 is support frame overall structure diagram；

Fig. 6 is the schematic diagram that radial magnetic field acts on test specimen；

Fig. 7 is the sound insulation property curve for the test specimen that the present invention tests；

Description of symbols；1- impedance tube；2- is tunable radial magnetic field loading device；3- cylinder iron core；4- annulus frame； 5- copper enameled wire；6- angle steel；7- rectangular slab；8- universal wheel.

Specific embodiment

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

The annulus frame outer radius of tunable radial magnetic field loading device of the present invention is 250m, and inside radius is 225mm, width 100mm；The cylinder iron core diameter is 20mm, length 210mm；The copper enameled wire radius is 0.6mm；It is by single coil unit the number of turns that cylinder iron core is formed by tunable radial magnetic field loading device with copper enameled wire 1000。

The present embodiment middle impedance pipe inside radius r=50mm, outer radius R=60mm are made of aluminum material.

The present embodiment coil baffle is nylon material, thickness 3mm.

The annulus frame of tunable radial magnetic field loading device is supported with support frame and is fixed in the present embodiment, concrete operations Are as follows: the threaded hole that a diameter is 10mm is bored on annulus frame, the position of the rectangle plane plate corresponding to support frame also bores one The identical threaded hole of a diameter passes through the rectangle plane plate surface of the threaded hole and support frame on annulus frame with clamping screw Hole connection, then be locked with locking nut, it thus can be fixed on the support frame by annulus frame, so that realizing will be tunable Radial magnetic field loading device is fixed.

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

The material parameter of the acoustic measurement system with tunable radial magnetic field loading device are as follows: annulus frame: aluminium [density p=2700kg/m³；Elastic modulus E=7e10Pa；Poisson's ratio ν=0.33]；Cylinder iron core, support frame, locking nut: Iron [density p=7900kg/m³；Elastic modulus E=2.12e10Pa；Poisson's ratio ν=0.31]；Copper enameled wire: copper [density p= 8920kg/m³；Elastic modulus E=1.2e11Pa；Poisson's ratio ν=0.34]；Insulating washer: epoxy resin [density p=2000kg/ m³；Elastic modulus E=1GPa；Poisson's ratio ν=0.38]；Coil baffle: nylon [density p=1130kg/m³；Elastic modulus E= 1.4GPa；Poisson's ratio ν=0.4]

In conjunction with attached drawing, specific implementation are as follows:

Step 1: two panels coil baffle is fixed on cylinder iron core with hot melt adhesive, a period of time is placed after gluing, waits hot melt Glue, which dries out, to be strengthened, wherein a piece of coil baffle is when fixed apart from the threaded one end 70-80mm of cylinder iron core, another fixation In the non-threaded one end of cylinder iron core；

Step 2: copper enameled wire is equably wound between two pieces of coil baffles, during coiling, often around one layer just with exhausted Edge adhesive tape wraps up one layer, and coiling is wrapped up completely with insulating tape again after finishing, and finally reserves one section of copper enameled wire for connecting DC power supply is connect, the copper enameled wire reserved is wrapped up with insulating gum cover, prevents from leaking electricity, and single coil is made in guarantee test safety Unit, as shown in Figure 3.

Step 3: repeating second step 4 times, 4 coil units are made in total, which is equably inserted into annulus frame In 4 holes of frame, coil unit is fixed with locking nut, guarantees that coil unit is less than 2mm apart from impedance tube outer surface, it will The copper enameled wire reserved connects DC power supply, and tunable radial magnetic field loading device has thus been made.

Step 4: tunable radial magnetic field loading device is covered on impedance tube, as shown in Figure 1, can to form radial magnetic field The acoustic measurement system of adjusting load device, then tunable radial magnetic field loading device position is adjusted, it is corresponded to and is placed in resistance The position of test specimen in anti-pipe, makes it act on the radial direction of test specimen.

In the present embodiment, copper enameled wire accesses after electric current and forms radial magnetic field in annulus frame center, and magnetic field strength can It is quantitatively controlled by the size of input current.

Tunable radial magnetic field loading device COMSOL Multiphysics5.4 simulation input 15A in the present embodiment When electric current, internal magnetic field distribution situation, as a result as shown in Figure 4.

Figure 4, it is seen that tunable radial magnetic field loading device is in cylinder iron core both ends areas adjacent larger range Interior generation radial magnetic field, radial magnetic field sphere of action can reach 50mm, and magnetic field strength maximum is close to 0.11T, tunable radial direction The range and magnetic field strength for the radial magnetic field that magnetic field loading device generates can satisfy test requirements document.

When test specimen is fitted into impedance tube, for anti-leak-stopping sound, it is wound in test specimen edge with unsintered tape, and spread Vaseline, for sealing and lubricating.

Test results are shown in figure 7, it can be seen from the figure that the sound insulation curve of test specimen is under the action of radial magnetic field There is apparent movement, the radial magnetic to test specimen real-time loading varying strength may be implemented in improved acoustic measurement system , change the sound insulation property of test specimen, can satisfy test requirements document, actual test shows that tunable radial magnetic field loading device can be with Change the sound insulation property of test specimen in real time.

In conjunction with the embodiments, the acoustic measurement system proposed by the invention with tunable radial magnetic field loading device, can Under the premise of guaranteeing measurement request, radial magnetic field test environment tunable needed for test is provided.

The present embodiment is transformed impedance tube measuring system, is feasible from the working principle angle analysis of impedance tube 's.

Test need to be soft in the mating test of impedance tube measuring system according to physical location of the test specimen in impedance tube every time Adjusting parameter in part Va-Lab.

These characteristics according to the present invention, can be applied to the vehicles sound arrester design and building field every Sound design etc., improves people's lives environment, especially in terms of low frequency, has good experimental applications prospect.

Described above is preferred embodiment, cannot function as full scope of the invention, can with band of the present invention Tune radial magnetic field loading device acoustic measurement system on the basis of do it is any be significantly improved, replacement or modification belongs to this hair In bright patent coverage area.