CN104122331A - Non-destructive testing system and method based on contact vibration of piezoelectric disk - Google Patents
Non-destructive testing system and method based on contact vibration of piezoelectric disk Download PDFInfo
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- CN104122331A CN104122331A CN201410354510.9A CN201410354510A CN104122331A CN 104122331 A CN104122331 A CN 104122331A CN 201410354510 A CN201410354510 A CN 201410354510A CN 104122331 A CN104122331 A CN 104122331A
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Abstract
The invention discloses a non-destructive testing system and method based on contact vibration of a piezoelectric disk. The nondestructive testing system comprises the piezoelectric disk, a moving stand, a signal generator, a power amplifier, a strain gauge, a data acquisition card and a computer, wherein the piezoelectric disk comprises a disk substrate, piezoelectric sheets, a probe and a strain gage, the piezoelectric sheets are arranged on the lower surface of the disk substrate and are distributed in a central symmetry manner, the probe is arranged at the circle center of the lower surface of the disk substrate and is vertical to the disk substrate, and the strain gage is arranged on the upper surface of the disk substrate. According to the non-destructive testing system, based on the contact vibration of the piezoelectric disk and a sample, the local contact rigidity is detected by tracing the vibration characteristic of the piezoelectric disk, the structural rigidity distribution can be obtained by detecting the surface of the sample point by point, and further, the evaluation on the structural health degree is completed; the testing principle adopted by the system and the method is simple, and the system and the method are applicable to non-destructive testing on thin plate structures, such as composite laminates or soft materials.
Description
Technical field
The invention belongs to material structure safety monitoring field, be specifically related to a kind of nondestructive detection system and detection method thereof based on the contact vibration of piezoelectricity disk.
Background technology
Dynamic Non-Destruction Measurement can complete damage check and the health assessment to material or structure, thereby has great importance in industrial development.In the case of structure through the longer operating period or be subject to external effect may cause damage, we need to understand the health condition of inside configuration to determine whether structure can also work on, or repair for concrete degree of impairment.Especially at aerospace field, along with the composite thin plate structure of industrial expansion high-strength light is more and more applied, composite thin plate structure easily ruptures, layering, laying fold, come off and the defect such as separate, large and the serious aerospace industry of fatigue loading for load capacity, the Non-Destructive Testing that how to complete composite thin plate structure is a urgent problem.
The methods such as at present such as ultrasonic, ray of traditional Dynamic Non-Destruction Measurement and magnetic detection, can complete the detection to most industrial structures, but to novel composite thin plate still there is larger difficulty in isostructural detection.For ultrasonic method, because the material property of compound substance exists serious anisotropy and obvious to acoustic attenuation effect, therefore compound substance is not suitable for ultrasonic method.And in thin plate lattice structure, usually because ultrasonic examination exists thickness blind area more, and complex structure causes the propagation reflections complexity of sound wave, and then cause the Ultrasonic Detection in grid thin-slab construction to be difficult to realize.For class electromagnetic methods such as ray and magnetic detections, because compound substance is insensitive to electromagnetism, large and to be not easy to detection in place etc. former thereby can not in the Non-Destructive Testing of grid thin-slab construction, apply to human injury.In order to complete the Non-Destructive Testing task to composite structure, need to develop the method that is applicable to thin-slab construction Non-Destructive Testing.
Summary of the invention
Be difficult to the problem to composite thin plate structure detection in order to solve lossless detection method in prior art, the present invention proposes a kind of contact vibration based on piezoelectricity disk and sample, carry out nondestructive detection system and the method for the local contact stiffness of detecting material or structure by following the trail of the vibration characteristics of piezoelectricity disk.
One object of the present invention is to propose a kind of nondestructive detection system based on the contact vibration of piezoelectricity disk.
Nondestructive detection system based on the contact vibration of piezoelectricity disk of the present invention comprises: piezoelectricity disk, traversing carriage, signal generator, power amplifier, strainmeter, data collecting card and computing machine; Wherein, piezoelectricity disk comprises disk substrate, piezoelectric patches, probe and foil gauge, piezoelectric patches be positioned at disk substrate lower surface and centered by symmetrical, probe is positioned at the lower surface circle centre position of disk substrate and perpendicular to disk substrate, foil gauge is arranged in the upper surface of disk substrate; The circumference of the disk substrate of piezoelectricity disk is arranged on traversing carriage, drives piezoelectricity disk to move on the surface of sample by traversing carriage; Signal generator is connected to power amplifier through data line, and power amplifier is connected to the piezoelectric patches of piezoelectricity disk by wire; The foil gauge of piezoelectricity disk is connected to strainmeter by data line; Strainmeter is connected to data collecting card by data line; Data collecting card is connected to computing machine by data line.
Disk substrate is thin plate, and the relation between thickness h and radius R meets
disk substrate, under the drive of piezoelectric patches, can inspire needed integrally bending mode of oscillation like this.The probe that is positioned at place of disk substrate center is tapered, and its head is spherical; In testing process, the border of the circumference of disk substrate is fixed support boundary condition, and the head of probe contacts with the surface of sample.The height H of probe
tanand the relation between the radius R of disk substrate meets
thereby make probe under the mobility and freedom prerequisite that can meet structure, be unlikely to affect the harmony of piezoelectricity disk vibration itself simultaneously.Piezoelectric patches adopts centrosymmetric structure, as multi-disc be centrosymmetric fan-shaped, or the annulus concentric with disk substrate, this centrosymmetric piezoelectric patches ensures symmetrical mode centered by the vibration of excitation piezoelectricity disk.The internal diameter R of piezoelectric patches
1with external diameter R
2meet 0.2R≤R
1< R
2≤ 0.9R; The thickness t of piezoelectric patches and disk substrate h approach, and meet 0.5h≤t≤1.5h.
Signal generator sends accumulation signal, and excitation piezoelectric patches occurs vibrate and drive disk substrate to vibrate, and further drives probe and sample to come in contact vibration; Be positioned at the strain of foil gauge perception piezoelectricity disk and then the contact resonance information of acquisition piezoelectricity disk of disk upper surface of base plate, i.e. strain signal; Foil gauge transfers to strainmeter by the strain signal detecting by data line.The accumulation signal that signal generator sends is divided into two kinds of the signal of fixed frequency and swept-frequency signals; Correspondingly, the Dynamic Signal that strainmeter detects is divided into determines two kinds of frequency response induction signal and frequency sweep response signals.
Signal generator sends the swept-frequency signal of multiple cline frequency points, the response of piezoelectricity disk is also frequency sweep, the dynamic frequency sweep response signal of strainmeter collection, find out resonant frequency by extracting peak swing respective frequencies in multiple frequencies, computing machine extracts resonant frequency and calculates local contact stiffness value, and this pattern is sweep check pattern; Signal generator sends the sinusoidal signal of single-frequency, the response of piezoelectricity disk is also the sinusoidal signal of single-frequency, frequency response induction signal is determined in strainmeter collection dynamically, and the amplitude of computing machine extraction sinusoidal signal carrys out the local contact stiffness value of test material, and this pattern is fixed test pattern frequently.In actual measurement process, use the Non-Destructive Testing that sweep check pattern or fixed test pattern frequently all can complete paired samples, the feature of sweep check pattern is that precision is high but speed is slow, and the fixed feature of test pattern is frequently that speed is fast but precision is low.Therefore in conjunction with these two kinds of patterns, detection that can good complete paired samples.
Strainmeter can detect Dynamic Signal, stationary singnal also can be detected.The distortion of piezoelectricity disk can be divided into two parts: the static buckling distortion of entirety, and the distortion of the dynamic vibration of little amplitude; Static buckling distortion is due to the upper distortion that contact force causes afterwards of initial contact, detects by the stationary singnal of strainmeter; And dynamic vibration distortion is that piezoelectric patches excited vibration causes, be sinusoidal, by the dynamic signal detection of strainmeter.By stationary singnal can perception probe and sample between contact force; Can follow the trail of the dynamic vibration characteristic that obtains piezoelectricity disk as resonant frequency (sweep check pattern) or vibration amplitude (fixed test pattern frequently) by Dynamic Signal; Further, can obtain the local contact stiffness information of the contact point of sample and probe by surveying the dynamic vibration characteristic of piezoelectricity disk.
Computing machine comprises: signal generating module, produces the accumulation signal that encourages piezoelectric patches for control signal generator; Signal acquisition module, gathers strain signal for controlling data collecting card; And computing module, for the elastic property of calculation sample and the health status of evaluation structure.
Computing machine is connected with data collecting card with signal generator respectively by data line, signal generator produces accumulation signal excitation piezoelectric patches, and then drive piezoelectricity disk and sample to come in contact vibration, foil gauge gathers strain signal and transfers to strainmeter, and the strain signal that data collecting card collection is nursed one's health through strainmeter is also passed to computing machine.
Traversing carriage comprises fixed mount and the mobile device of annular, the circumference of disk substrate is fixed on fixed mount, fixed mount is arranged on mobile device, thereby fixes piezoelectricity disk and drive piezoelectricity source tray to move on the surface of sample, and then the detection of the target area of complete paired samples.The circumference of piezoelectricity disk is fixed on annular fixed mount, and this continuously large stiffness structure is fixed, and make the periphery of whole piezoelectricity disk all in a good mechanics fixed boundary state, thereby structure is more stable.Fixed mount adopts the large material of rigidity, as materials such as stainless steels, realizes the rigidity of fixed mount by increased in size and quality.The own size of fixed mount (thickness) and quality will, much larger than piezoelectricity disk, provide a stable fixed support border by obtaining a larger inertia.
Another object of the present invention is to provide a kind of lossless detection method based on the contact vibration of piezoelectricity disk.
Lossless detection method based on the contact vibration of piezoelectricity disk of the present invention, comprises the following steps:
1), according to the size of piezoelectricity disk, structure and material, determine the mechanical model of piezoelectricity disk, thereby obtain the resonant frequency f of piezoelectricity disk according to mechanical model
nor the vibration amplitude of vibrational system, with the local contact stiffness k of sample
*between relation;
2) traversing carriage that piezoelectricity disk is installed is placed on to sample surfaces to be measured;
3) detect the stationary singnal of foil gauge by strainmeter, obtain the contact force between probe and sample, by adjusting the height of traversing carriage, thereby adjust the contact force between probe and sample;
4) computer control signal generator sends accumulation signal, and excitation piezoelectric patches drives the vibration of disk substrate, comes in contact vibration thereby drive between probe and sample, and piezoelectricity disk carries out stable state resonance;
5) strainmeter detects strain signal and transfers to strainmeter, transfers to data collecting card, the strain signal of data collecting card collection conditioning after strainmeter conditioning strain signal;
6) computing machine is processed by data collecting card and is gathered the strain signal coming, and then obtains the local contact stiffness information of sample, and the local contact stiffness information of passing through just can obtain the health degree of sample.
Above-mentioned detection method can adopt sweep check pattern, and signal generator sends dynamic swept-frequency signal, the dynamic frequency sweep response signal of strainmeter collection, and computing machine extracts resonant frequency and calculates local contact stiffness value, and this pattern is sweep check pattern; Signal generator sends the signal of fixed frequency, and frequency response induction signal is determined in strainmeter collection, and computing machine extracts vibration amplitude value and calculates local contact stiffness value, and this pattern is fixed test pattern frequently.
Advantage of the present invention:
Detection method of the present invention adopts the piezoelectricity disk of centrosymmetric structure, based on the contact vibration of piezoelectricity disk and sample, carry out the local contact stiffness of detecting material or structure by following the trail of the vibration characteristics of piezoelectricity disk, further this piezoelectricity disk is integrated on a device that can move freely at sample surfaces, can be by detect to obtain the Stiffness Distribution of structure by pointwise at sample surfaces, and then complete the evaluation to structural health degree.Compared to existing lossless detection method, test philosophy used in the present invention is simple and reliable, is applicable to thin-slab construction as the Non-Destructive Testing of composite laminated plate or soft material.
Brief description of the drawings
Fig. 1 is the structural representation of a kind of nondestructive detection system based on the contact vibration of piezoelectricity disk of the present invention;
Fig. 2 is the schematic diagram of an embodiment of the piezoelectricity disk of the nondestructive detection system based on the contact vibration of piezoelectricity disk of the present invention, wherein, (a) being the schematic diagram of the upper surface of piezoelectricity disk, is (b) schematic diagram of the lower surface of the fan-shaped piezoelectricity disk that is centrosymmetric of multi-disc for piezoelectric patches;
Fig. 3 is that the piezoelectric patches of the nondestructive detection system based on the contact vibration of piezoelectricity disk of the present invention is the schematic diagram of the lower surface of annular piezoelectricity disk;
The sectional view of the first rank mode of oscillation that the piezoelectric patches that Fig. 4 is centrosymmetric for the nondestructive detection system based on the contact vibration of piezoelectricity disk of the present invention ejects;
Fig. 5 is the schematic diagram of the mechanical model of the piezoelectricity disk vibration system of the nondestructive detection system based on the contact vibration of piezoelectricity disk of the present invention;
Fig. 6 is the resonant frequency f of the piezoelectricity disk of the nondestructive detection system based on the contact vibration of piezoelectricity disk of the present invention
nlocal contact stiffness k with sample
*between the curve map of relation;
The schematic diagram that the probe of the local contact stiffness detection system that Fig. 7 (a) is beam type contacts with sample, (b) is the schematic diagram that the probe of the piezoelectricity disk of the nondestructive detection system based on the contact vibration of piezoelectricity disk of the present invention contacts with sample.
Embodiment
Below in conjunction with accompanying drawing, by specific embodiment, further set forth the present invention.
As shown in Figure 1, the nondestructive detection system based on the contact vibration of piezoelectricity disk of the present invention comprises: piezoelectricity disk 2, traversing carriage, signal generator 4, strainmeter 5, data collecting card 6 and computing machine 7; Wherein, piezoelectricity disk 2 comprises disk substrate 21, piezoelectric patches 22, probe 23 and foil gauge 24, piezoelectric patches 22 be positioned at disk substrate lower surface and centered by symmetric figure, probe 23 is positioned at the lower surface circle centre position of disk substrate and perpendicular to disk substrate 21, as shown in Fig. 2 (b), foil gauge 24 is arranged in the upper surface of disk substrate 21, as shown in Fig. 2 (a); The circumference of the disk substrate 21 of piezoelectricity disk 2 is arranged on traversing carriage, drives piezoelectricity disk 2 to move on the surface of sample 1 by traversing carriage; Signal generator 4 is connected to power amplifier 41 by data line, and power amplifier 41 is connected to the piezoelectric patches 22 of piezoelectricity disk through wire; The foil gauge 24 of piezoelectricity disk 2 is connected to strainmeter 5 by data line; Strainmeter 5 is connected to data collecting card 6 by data line; Data collecting card 6 is connected to computing machine 7 by data line.
The mobile device 32 of traversing carriage adopts universal wheels, is arranged on equably annular fixed mount 31 times.
In the present embodiment, disk substrate 21 all adopts stainless steel material with fixed mount 31; Piezoelectric patches 22 adopts PZT-5H piezoelectric.Radius R=the 100mm of disk substrate 21, thickness h=2mm; The height H of probe
tan=20mm; The thickness t of piezoelectric ring sheet is 2mm, its internal diameter R
1with external diameter R
2be respectively 40mm and 80mm.
Further, hand-held handle 8 is installed on annular fixed mount 31, composition handle type detection architecture, the line of 2 that the two ends of hand-held handle 8 are arranged on annular fixed mount 31 passes through the center of circle.Can allow this detection architecture move at sample surfaces by ambulatory handheld handle 8; In moving process, probe 23 and the sample 1 of piezoelectricity disk keep in touch; By moving on the surface of sample 1, just can complete the Non-Destructive Testing to interested surveyed area.
Piezoelectric patches 22 adopts centrosymmetric structure, can for multi-disc be centrosymmetric fan-shaped, as shown in Fig. 2 (b); Or be the annulus concentric with disk substrate, as shown in Figure 3, this centrosymmetric structure can motivate the mode of center vibration, as shown in Figure 4.
Lossless detection method proposed by the invention based on piezoelectricity disk contact vibration survey the local contact stiffness for the treatment of geodesic structure, elaborate ultimate principle of the present invention here.
The border of piezoelectricity disk is: the boundary condition of circumference is fixed support; Circle centre position contacts with sample by probe, and the boundary condition of circle centre position is resiliency supported.The circumference of piezoelectricity disk is fixed and probe and the sample contact vibration at center form piezoelectricity disk vibration system, obtained by vibration mechanics correlation theory, it is around the mechanical model clamped, center is resiliency supported that this vibrational system can be reduced to, as shown in Figure 5, in this mechanical model, interaction between probe and sample is simulated with a spring, and the elasticity coefficient of spring is k
*, this elasticity coefficient k
*be the local contact stiffness k of sample
*.
Obtain according to vibration mechanics knowledge, in above-mentioned piezoelectricity disk vibration system, the resonant frequency f of piezoelectricity disk
nlocal contact stiffness k with sample
*relation can be with an analytical expression f
n=H (k
*) describe, and, in the time that the elasticity coefficient k* of spring is higher, the resonant frequency f of this vibrational system
nalso larger, the resonant frequency f of piezoelectricity disk
nlocal contact stiffness k with sample
*relation meet similar curve as shown in Figure 6.Resonant frequency f
nwith local contact stiffness k
*relation, relevant with size, the structure and material of piezoelectricity disk, corresponding unique analytic solution.
By using a swept-frequency signal exciting piezoelectricity disk, follow the trail of the resonant frequency f of piezoelectricity disk
n, and then follow the trail of the local contact stiffness k that obtains sample
*information, such test pattern is sweep check pattern.Equally, by using the signal exciting piezoelectricity disk of a fixed frequency, in the time that the local contact stiffness k* of sample is different, the vibration amplitude of this vibrational system is also different.Therefore can, by using this system of signal exciting that frequency is fixing, follow the trail of the vibration amplitude of vibrational system, and then follow the trail of the local contact stiffness information that obtains sample, this pattern is fixed test pattern frequently.
Compared with the local contact stiffness detection system of beam type, the local contact stiffness sniffer of disc type proposed by the invention has following difference and advantage:
1, beam type design torsional rigidity is very low, the needle point of probe is in the time that sample surfaces moves, the transverse force existing can make semi-girder be distorted, and then affect structure phychology and detectable signal, and the design of employing disc type, form a kind of brand-new centrosymmetric structure, this structure is in the time that sample surfaces moves, because all directions rigidity of structure is all very high, thereby laterally disturb and can reduce much compared with the design of beam type, the interference that detectable signal is brought still less and even completely cancellation, thereby solve contact and surveyed existing transverse force problem, therefore disc type design is more suitable for the mobile monitoring at sample surfaces,
2, only at one end there is a point of fixity in beam type design, and the surrounding of piezoelectricity disk is all used continuously large stiffness structure to fix, whole disc circumference is all in a good mechanics fixed boundary state, thereby structure is more stable, signal to noise ratio (S/N ratio) is also higher, and therefore disc type design is more suitable for applying in method for oscillating compared with beam type design;
3, beam type design adopts unjointed beam to be all piezoelectric design or the lower surface arrangement piezoelectric patches design at semi-girder, its dynamics and the deformation state ejecting are all very complicated, and the design of disc type adopts centrosymmetric piezoelectric patches group or toroidal design, being designed with of Central Symmetric helps inspire needed " the first center, rank vibration " mode, as shown in Figure 4, and suppress the appearance of unwanted interference modal, therefore disc type design is more suitable for the application in contact vibration method compared with beam type design;
4, the probe of beam type design comes in contact with sample under pressure, because pressure is to be passed over by semi-girder, thereby probe is stressed and asymmetric, usually can there is the bending of off-axis, as shown in Fig. 7 (a), this departing from can cause probe vibration shape complexity and bring undesired signal into, and in disc type design, the axis place of probe in centrosymmetric structure, therefore stressed even, probe can keep vertical with sample, as shown in Fig. 7 (b), there is not the problem of beam type design, thereby the stability of the more favourable increase detection of the design of disc type;
5, transverse force can be more obvious when transverse shifting on curved surface for the probe of beam type design, and adopt disc type design and pass through to coordinate universal wheels, will make disc type design be more suitable at complex surface as the hand-held mobile detection of the curved surface of wing etc.
Lossless detection method based on the contact vibration of piezoelectricity disk of the present invention, comprises the following steps:
1), according to the size of piezoelectricity disk, structure and material, determine the mechanical model of piezoelectricity disk, thereby obtain the resonant frequency f of piezoelectricity disk according to mechanical model
nor the vibration amplitude of vibrational system, with the local contact stiffness k of sample
*between relation, meet curve as shown in Figure 6;
2) traversing carriage that piezoelectricity disk is installed is placed on to the surface of sample to be measured;
3) by the stationary singnal of strain-ga(u)ge measurement foil gauge, obtain the contact force between probe and sample, by adjusting the height of universal wheels, thereby adjust the contact force between probe and sample;
4) computer control signal generator sends accumulation signal, and excitation piezoelectric patches drives the vibration of disk substrate, comes in contact vibration thereby drive under probe between probe and sample, and piezoelectricity disk carries out stable state resonance;
5) strainmeter detects strain signal and transfers to strainmeter, transfers to data collecting card, the strain signal of data collecting card collection conditioning after strainmeter conditioning strain signal;
6) computing machine is processed by data collecting card and is gathered the strain signal coming, and then obtains the local contact stiffness information of measurement point sample, and the local contact stiffness information of passing through just can obtain the health degree of sample.
Finally it should be noted that publicizing and implementing routine object is to help further to understand the present invention, but it will be appreciated by those skilled in the art that: without departing from the spirit and scope of the invention and the appended claims, various substitutions and modifications are all possible.Therefore, the present invention should not be limited to the disclosed content of embodiment, and the scope that the scope of protection of present invention defines with claims is as the criterion.
Claims (10)
1. the nondestructive detection system based on the contact vibration of piezoelectricity disk, it is characterized in that, described nondestructive detection system comprises: piezoelectricity disk (2), traversing carriage, signal generator (4), power amplifier (41), strainmeter (5), data collecting card (6) and computing machine (7); Wherein, described piezoelectricity disk (2) comprises disk substrate (21), piezoelectric patches (22), probe (23) and foil gauge (24), piezoelectric patches (22) be positioned at disk substrate lower surface and centered by symmetrical, probe (23) is positioned at the lower surface circle centre position of disk substrate and perpendicular to disk substrate (21), foil gauge (24) is arranged in the upper surface of disk substrate (21); The circumference of the disk substrate (21) of described piezoelectricity disk (2) is arranged on traversing carriage, drives piezoelectricity disk (2) to move on the surface of sample (1) by traversing carriage; Described signal generator (4) is connected to power amplifier (41) by data line, and power amplifier (41) is connected to the piezoelectric patches (22) of piezoelectricity disk through wire; The foil gauge (24) of described piezoelectricity disk (2) is connected to strainmeter (5) by data line; Described strainmeter (5) is connected to data collecting card (6) by data line; Described data collecting card (6) is connected to computing machine (7) by data line.
2. nondestructive detection system as claimed in claim 1, is characterized in that, the relation between thickness h and the radius R of described disk substrate (21) meets
3. nondestructive detection system as claimed in claim 1, is characterized in that, the height H of described probe
tanand the relation between the radius R of disk substrate meets
4. nondestructive detection system as claimed in claim 1, is characterized in that, the internal diameter R of described piezoelectric patches (22)
1with external diameter R
2meet 0.2R≤R
1< R
2≤ 0.9R; The thickness t of piezoelectric patches meets 0.5h≤t≤1.5h, and wherein, R is the radius of disk substrate, and h is the thickness of disk substrate.
5. nondestructive detection system as claimed in claim 1, is characterized in that, the accumulation signal that described signal generator (4) sends is divided into two kinds of the signal of fixed frequency and swept-frequency signals; Correspondingly, the Dynamic Signal that described strainmeter (5) detects is divided into determines two kinds of frequency response induction signal and frequency sweep response signals.
6. nondestructive detection system as claimed in claim 1, is characterized in that, described computing machine comprises: control signal generator produces the signal generating module of the accumulation signal of excitation piezoelectric patches; Control the signal acquisition module that data collecting card gathers strain signal, for; And the computing module of the elastic property of calculation sample and the health status of evaluation structure.
7. nondestructive detection system as claimed in claim 1, it is characterized in that, described traversing carriage comprises fixed mount (31) and the mobile device (32) of annular, it is upper that the circumference of described disk substrate (21) is fixed on fixed mount (31), and described fixed mount (31) is arranged on mobile device (32).
8. nondestructive detection system as claimed in claim 1, is characterized in that, further comprises hand-held handle (8), and described hand-held handle (8) is arranged on traversing carriage.
9. the lossless detection method based on the contact vibration of piezoelectricity disk, is characterized in that, comprises the following steps:
1), according to the size of piezoelectricity disk, structure and material, determine the mechanical model of piezoelectricity disk, thereby obtain the resonant frequency f of piezoelectricity disk according to mechanical model
nor the vibration amplitude of vibrational system, with the local contact stiffness k of sample
*between relation;
2) traversing carriage that piezoelectricity disk is installed is placed on to sample surfaces to be measured;
3) detect the stationary singnal of foil gauge by strainmeter, obtain the contact force between probe and sample, by adjusting the height of traversing carriage, thereby adjust the contact force between probe and sample;
4) computer control signal generator sends accumulation signal, and excitation piezoelectric patches drives the vibration of disk substrate, comes in contact vibration thereby drive between probe and sample, and piezoelectricity disk carries out stable state resonance;
5) strainmeter detects strain signal and transfers to strainmeter, transfers to data collecting card, the strain signal of data collecting card collection conditioning after strainmeter conditioning strain signal;
6) computing machine is processed by data collecting card and is gathered the strain signal coming, and then obtains the local contact stiffness information of sample, and the local contact stiffness information of passing through just can obtain the health degree of sample.
10. lossless detection method as claimed in claim 9, is characterized in that, described detection method adopts sweep check pattern, and signal generator sends swept-frequency signal, and strainmeter gathers frequency sweep response signal, and computing machine extracts resonant frequency and calculates local contact stiffness; Or adopt fixed test pattern frequently, signal generator sends the signal of fixed frequency, and frequency response induction signal is determined in strainmeter collection, and computing machine extracts vibration amplitude value and calculates local contact stiffness.
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| CN104473638A (en) * | 2014-12-26 | 2015-04-01 | 北京大学 | Mammary tissue elastography detection array structure based on piezoelectric impedance method and detection method of mammary tissue elastography detection array structure |
| CN105784238A (en) * | 2016-05-19 | 2016-07-20 | 北京大学 | Method for measuring material surface residual stress and system thereof |
| CN106018566A (en) * | 2016-07-05 | 2016-10-12 | 华中科技大学 | Ultrasonic transducer |
| CN109591525A (en) * | 2018-11-29 | 2019-04-09 | 吉林大学 | A kind of cantilevered many reference amounts independent detection device and detection method |
| CN110082432A (en) * | 2019-05-20 | 2019-08-02 | 北京工业大学 | Plate fault of construction ultrasound resonance quantitative NDT method based on uniform design |
| WO2019151952A1 (en) * | 2018-02-01 | 2019-08-08 | Nanyang Technological University | Arrangement for non-destructive testing and a testing method thereof |
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| CN105784238B (en) * | 2016-05-19 | 2018-06-08 | 北京大学 | A kind of measuring method and its system of material surface residual stress |
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| CN110082432B (en) * | 2019-05-20 | 2022-01-14 | 北京工业大学 | Ultrasonic resonance quantitative nondestructive detection method for plate structure defects based on uniform design |
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