CN205749240U - A kind of macromolecular material internal flaw the cannot-harm-detection device - Google Patents
A kind of macromolecular material internal flaw the cannot-harm-detection device Download PDFInfo
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- CN205749240U CN205749240U CN201620609106.6U CN201620609106U CN205749240U CN 205749240 U CN205749240 U CN 205749240U CN 201620609106 U CN201620609106 U CN 201620609106U CN 205749240 U CN205749240 U CN 205749240U
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Abstract
The utility model discloses a kind of macromolecular material internal flaw the cannot-harm-detection device, including the function signal generator being linked in sequence successively by connecting line, power amplifier and vibrator, workpiece for measurement hangs on support by elastic rope, and workpiece for measurement bottom surface triggers end with vibrator and contacts；Multiple acceleration transducers are uniformly distributed along the circumference and are pasted on workpiece for measurement surface, and acceleration transducer is connected with charge amplifier by connecting line, and charge amplifier is connected with digital signal processing device by connecting line.This utility model provides a kind of on the premise of not destroying material, the device detecting macromolecular material internal structure, urgent is shaken by what macromolecular material was produced by vibrator, can accurately obtain defect type and generation position by vibration modal analysis device.
Description
Technical field
This utility model belongs to a kind of material internal defect the cannot-harm-detection device, is specifically related to inside a kind of macromolecular material
Defect the cannot-harm-detection device.
Background technology
Macromolecular material is better than other materials at aspects such as mechanical property and processing plasticity, insulating properties, corrosion resistances.
Particularly macromolecule epoxy resin resin infusion glue is at power electronics such as such as transformator, transformer, hysteresis machine, induction machines
All there is on equipment wide application.
In actual use, in order to obtain some mechanical characteristic of macromolecular material further, generally it is required for adding again
Close additive, it is modified or changes its color because special requirement adds dyestuff.But the macromolecule after modification or dyeing
Material is the opaquest, by the method for range estimation be difficult to find under top layer even material internal exist as material release,
Crackle, internal lockhole, air entrapment, the incomplete mass defect of gel.
The damage identification technique relative maturity of material internal, normally referred to as Non-Destructive Testing, is to use not cause material
The means destroyed, damage, the method that the component capabilities paid close attention to, feature, degree of impairment are judged.But the ocular estimate of routine,
Magnetic field method, thermal imaging method, current vortex, ray method etc. all should not be applied on macromolecular material.
Utility model content
This utility model proposes to overcome shortcoming present in prior art, its objective is to provide a kind of high score
Sub-material internal defect the cannot-harm-detection device.
Know-why of the present utility model:
Modal parameters (vibration, the vibration shape and damping) is the letter of structural physical feature parameter (quality, rigidity, damping)
Number.Structural physical feature will be caused to change when internal structure occurs damage, i.e. structural parameters change, and utilize vibration
Method of testing measures these parameters, so that it may fault of construction situation is analyzed and is diagnosed.
Its principle is:
For having the many-degrees of freedom system of damping characteristic, the characteristic equation of system is represented by:
[M] in formula is Mass matrix, and [C] is damping battle array, and [K] is Stiffness Matrix, and { f (t) } is load.
Above formula is expressed as in complex domain:
[K]{Φi}=ωi 2[M]{Φi }
ω in formulaiIt is the frequency of vibration of the i-th order mode state, { ΦiBe the i-th order mode state vibration performance vector.
Utilize Finite Element Method that the equation of motion is reduced, obtain the strain value of approximation, through unitization acquisition structure
Strain mode.
Such as identifying the internal structure formula containing crack, rigidity kr=1/C at crack, C is the letter of the penetration of fracture and depth of section
Number, when internal force balance, EI+ with EI-of moment of flexure expression is unequal, illustrates that crack, cross section first-order partial derivative is discontinuous, further
Illustrating that ess-strain mode equation can not be led, curve is discontinuous.Thus identify mode defect characteristic.
The position analysis occurred for defect, can be from the definition of small echo, and wavelet function requires have the drawn game of concussion property
Sex-limited, i.e. on an interval quickly converge on 0.Characteristic equation is decomposed into some wavelet coefficients, then has:
Above formula is arranged:
As can be seen here, Wf is f first derivative maximum after smooth.This point is the catastrophe point in signal, thus may be used
Find the position of defect point.
Detection device of the present utility model is a kind of on the premise of not destroying material, by the method analyzing model of vibration
Color is carried out Inner Defect Testing device compared with macromolecular material deep, that transparency is bad.Detection device of the present utility model will
Multiple acceleration transducers are anchored on polymer surface by bonding form, and acceleration transducer passes through charge amplifier
It is connected with signal regulating device.When a test is begun, exciting mechanical vibration by vibrator, computer is by conditioned letter
The information of internal flaw is obtained after number processing.After once material internal structure is subjected to damage, in structural mechanics system
The parameters such as quality coefficient, damping characteristic, stiffness characteristics will change therewith, thus causes the mode of oscillation of this system with complete
There is the change of response in receptance function.So it is believed that the change of Vibrating modal parameters is the mark because of structural damage.Pass through
Acceleration transducer can obtain material vibrating modal parameter, entered the analysis to this signal, can be with Structural Damage Detection feelings
Condition.
The technical solution of the utility model is:
A kind of macromolecular material internal flaw the cannot-harm-detection device, including the function letter being linked in sequence successively by connecting line
Number generator, power amplifier and vibrator, workpiece for measurement hangs on support by elastic rope, workpiece for measurement bottom surface with
Vibrator triggers end and contacts；Multiple acceleration transducers are uniformly distributed along the circumference and are pasted on workpiece for measurement surface, acceleration transducer
Being connected with charge amplifier by connecting line, charge amplifier is connected with digital signal processing device by connecting line.
The quantity of described acceleration transducer and installation site are calculated by wavelet theory and obtain.
The beneficial effects of the utility model are:
This utility model provides a kind of on the premise of not destroying material, detects macromolecular material internal structure
Device, urgent shaken by what macromolecular material was produced by vibrator, by vibration modal analysis device can accurately obtain defect type and
There is position.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model；
Fig. 2 is acceleration sensor installation site schematic diagram on workpiece for measurement in this utility model；
Fig. 3 is this utility model embodiment 1 Plays sample pattern oscillogram；
Fig. 4 is the oscillogram of the workpiece for measurement occurring defect in this utility model embodiment 1；
Fig. 5 is the workpiece for measurement defective locations scattergram occurring defect in this utility model embodiment 1.
Wherein:
1 function signal generator 2 connecting line
3 power amplifier 4 supports
5 elastic rope 6 workpieces for measurement
7 charge amplifier 8 digital signal processing devices
9 vibrator 10 acceleration transducers.
Detailed description of the invention
Below in conjunction with Figure of description and embodiment to this utility model one macromolecular material internal flaw Non-Destructive Testing
Device is described in detail:
As shown in Figure 1, 2, a kind of macromolecular material internal flaw the cannot-harm-detection device, including the most suitable by connecting line 2
Function signal generator 1, power amplifier 3 and the vibrator 9 that sequence connects, workpiece for measurement 6 hangs on support by elastic rope 5
On 4, workpiece for measurement 6 bottom surface triggers end with vibrator 9 and contacts；Multiple acceleration transducers 10 are uniformly distributed along the circumference to be pasted on and treat
Surveying workpiece 6 surface, acceleration transducer 10 is connected with charge amplifier 7 by connecting line 2, and charge amplifier 7 is by connecting line 2
It is connected with digital signal processing device 8.
The quantity of described acceleration transducer 10 and installation site are calculated by wavelet theory and obtain.
Embodiment 1
Utilize this utility model device to 100 circular macromolecular material inside workpiece defect detect；
() arranges function signal generator
Arranging function is swept-frequency signal, cycle 2s；
() arranges power amplifier
It is set to export 3.5V；
() arranges acceleration sensor
Pasting an acceleration sensor at interval of 120 ° on the periphery of workpiece for measurement, the response of acceleration transducer is
40mV/g；
() arranges digital processing unit
Arranging electric charge output, enlargement ratio is 100x, and null offset coefficient is 0.154, sets up wavelet function window；
() sets up matching template
As it is shown on figure 3, master sample model: according to the waveform of the appearance defect obtained of above-mentioned setting detection workpiece for measurement
Figure as shown in Figure 4, can draw defect position by comparison diagram 4, Fig. 5, as shown in Figure 5.
Claims (2)
1. macromolecular material internal flaw the cannot-harm-detection device, it is characterised in that: include by connecting line (2) successively order
Function signal generator (1), power amplifier (3) and the vibrator (9) connected, workpiece for measurement (6) is hanged by elastic rope (5)
Being hung on support (4), workpiece for measurement (6) bottom surface triggers end with vibrator (9) and contacts；Multiple acceleration transducers (10) edge
Circumference uniform distribution is pasted on workpiece for measurement (6) surface, and acceleration transducer (10) is by connecting line (2) with charge amplifier (7) even
Connecing, charge amplifier (7) is connected with digital signal processing device (8) by connecting line (2).
A kind of macromolecular material internal flaw the cannot-harm-detection device the most according to claim 1, it is characterised in that add described in:
The quantity of velocity sensor (10) and installation site are calculated by wavelet theory and obtain.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620609106.6U CN205749240U (en) | 2016-06-20 | 2016-06-20 | A kind of macromolecular material internal flaw the cannot-harm-detection device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620609106.6U CN205749240U (en) | 2016-06-20 | 2016-06-20 | A kind of macromolecular material internal flaw the cannot-harm-detection device |
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| CN205749240U true CN205749240U (en) | 2016-11-30 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105910986A (en) * | 2016-06-20 | 2016-08-31 | 中核(天津)科技发展有限公司 | High polymer material internal defect nondestructive detecting device |
| CN106198383A (en) * | 2016-09-13 | 2016-12-07 | 上海海事大学 | The nondestructive detection system of a kind of small size component top layer microfissure and method |
| CN108663012A (en) * | 2018-06-27 | 2018-10-16 | 大连理工大学 | A kind of detection method of gap inner wall microscopic appearance and roughness |
-
2016
- 2016-06-20 CN CN201620609106.6U patent/CN205749240U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105910986A (en) * | 2016-06-20 | 2016-08-31 | 中核(天津)科技发展有限公司 | High polymer material internal defect nondestructive detecting device |
| CN106198383A (en) * | 2016-09-13 | 2016-12-07 | 上海海事大学 | The nondestructive detection system of a kind of small size component top layer microfissure and method |
| CN108663012A (en) * | 2018-06-27 | 2018-10-16 | 大连理工大学 | A kind of detection method of gap inner wall microscopic appearance and roughness |
| CN108663012B (en) * | 2018-06-27 | 2019-08-20 | 大连理工大学 | A kind of detection method of gap inner wall microscopic appearance and roughness |
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