CN105527015A - Flexible structure resonant frequency visualized detection system and method - Google Patents
Flexible structure resonant frequency visualized detection system and method Download PDFInfo
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- CN105527015A CN105527015A CN201610008759.3A CN201610008759A CN105527015A CN 105527015 A CN105527015 A CN 105527015A CN 201610008759 A CN201610008759 A CN 201610008759A CN 105527015 A CN105527015 A CN 105527015A
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- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H13/00—Measuring resonant frequency
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Abstract
The invention discloses a flexible structure resonant frequency visualized detection system and method. The detection system comprises a signal generator, a voltage amplifier, an actuator, a piezoelectric material sensor, an AC-DC self-excited boost conversion circuit, a light-emitting diode and a brightness meter. The piezoelectric material sensor can well sense structure vibration frequency; and the brightness of the light-emitting diode increases with the increase of structure vibration, and thus structure vibration frequency can be measured and judged quickly.
Description
Technical field
The present invention relates to flexible structure damage check and structure Vibration Active Control field, be specifically related to a kind of flexible structure resonant frequency visual detecting system and method.
Background technology
The resonant frequency of structure in a lot of fields, comprises the fields such as structural design, damage check and Vibration Active Control all extremely important.In damage check or monitoring structural health conditions, compare other modal parameter, resonant frequency is little as the susceptibility of modal parameter to noise, and noise resisting ability is strong.
The sensitive element of piezoelectric sensor is made up of piezoelectric.The stressed rear surface of piezoelectric produces electric charge.This electric charge amplifies through charge amplifier and metering circuit and just becomes the electricity output being proportional to suffered external force after transforming impedance.Piezoelectric transducer is used for ergometry and can be transformed to the non-electrical physical quantity of power.Piezoelectric sensor has piezoelectric ceramics and piezoelectric membrane and piezoelectric fibre composite material, and wherein piezoelectric membrane is because quality is minimum so can be minimum to the interference of the resonant frequency of system.
Polyvinyladine floride (PolyvinylideneFluoride, PVDF) piezoelectric membrane has response extremely fast for the change of mechanical stress or strain, and Hz-KHz is wide, is therefore suitable as sensing element.
Light emitting diode in circuit and instrument as pilot lamp, or composition word or numerical monitor, its midplane Organic Light Emitting Diode (OrganicLight ?EmittingDiode, OLED) have light-emitting area evenly with without characteristics such as stroboscopics, the visual testing that other pointolites more contribute to resonant frequency is relatively studied.This research carries out the measurement of structural vibration frequency by piezoelectric sensor, and the voltage of the output of the dynamic strain signal only utilizing piezoelectric sensor to measure is not high, therefore needs voltage amplifier circuit to drive light emitting diode to reach the visual object of resonant frequency.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of flexible structure resonant frequency visual detecting system and method.
The scheme of technical solution problem of the present invention is as follows
Flexible structure resonant frequency visual detecting system comprise signal generator, voltage amplifier, actuator, piezoelectric sensor, Jiao Liu ?direct current auto-excitation type voltage up converting circuit, light emitting diode, nitometer; Described piezoelectric film sensor and actuator are arranged in flexible structure to be detected, signal generator, voltage amplifier are connected in turn with actuator, described piezoelectric film sensor by Jiao Liu ?direct current auto-excitation type voltage up converting circuit be connected with light emitting diode, nitometer is for detecting the brightness of light emitting diode.
Preferably, described piezoelectric sensor is piezoelectric membrane.Described Jiao Liu ?direct current auto-excitation type voltage up converting circuit be Jiao Liu ?Zhi Liu ?voltage amplifier.Described actuator is laminated piezoelectric actuator.Described light emitting diode is plane Organic Light Emitting Diode.
The actuator installation site of advising respectively for fixed boundary condition and the free boundary condition of flexible structure and piezoelectric film sensor installation site as follows:
(1) Gu Ding ?free boundary condition: actuator and piezoelectric sensor are installed near stiff end;
(2) Zi You ?free boundary condition: actuator is arranged near free end, and piezoelectric sensor is arranged on structure total length near 1/4 place of free end or be arranged on 1/2 place of structure total length near free end.
The invention also discloses the detection method of described detection system, its step is as follows:
Signal generator connects voltage amplifier and inputs accumulation signal to actuator, actuator excites the vibratory response of flexible structure, the piezoelectric film sensor that flexible structure is pasted is experienced vibration and is caused strain variation, the voltage signal changed, voltage signal by Jiao Liu ?direct current auto-excitation type voltage up converting circuit drive plane Organic Light Emitting Diode, the brightness of plane Organic Light Emitting Diode can change with the change of voltage signal, the brightness of nitometer detection plane Organic Light Emitting Diode, vibration frequency corresponding to brightness maxima place is the resonant frequency of flexible structure.
Compared with prior art, the beneficial effect had is in the present invention:
1) obtain resonant frequency under prior art to need to carry out model analysis, the present invention has Quick Measurement resonant frequency, can learn the advantage of the sizes values of resonant frequency by the brightness of naked-eye observation plane Organic Light Emitting Diode fast.
2) generally need traditional sensors and the Back end data gather and analysis systems such as power hammer, accelerometer under existing modal analysis technique, present system framework is simple, and relative cost demand is low, does not need oscillograph or signal collecting device.
Accompanying drawing explanation
Fig. 1 is the structural representation of embodiment 1 property structure resonant frequency visual detecting system;
Fig. 2 is the circuit diagram of embodiment 1;
Fig. 3 is the shinny lab diagram of OLED near second-order resonance frequency;
Fig. 4 is the shinny lab diagram of OLED near third order resonance frequency;
Fig. 5 is the shinny lab diagram of OLED near quadravalence resonant frequency.
Embodiment
As shown in Figure 1, the invention discloses a kind of flexible structure resonant frequency visual detecting system comprise signal generator, voltage amplifier, actuator, piezoelectric sensor, Jiao Liu ?direct current auto-excitation type voltage up converting circuit, light emitting diode, nitometer; Described piezoelectric film sensor and actuator are arranged in flexible structure to be detected, signal generator, voltage amplifier are connected in turn with actuator, described piezoelectric film sensor by Jiao Liu ?direct current auto-excitation type voltage up converting circuit be connected with light emitting diode, nitometer is for detecting the brightness of light emitting diode.
Preferably, described piezoelectric sensor is piezoelectric membrane.Described Jiao Liu ?direct current auto-excitation type voltage up converting circuit be Jiao Liu ?Zhi Liu ?voltage amplifier.Described actuator is laminated piezoelectric actuator.Described light emitting diode is plane Organic Light Emitting Diode.
The actuator installation site of advising respectively for fixed boundary condition and the free boundary condition of flexible structure and piezoelectric film sensor installation site as follows:
(1) Gu Ding ?free boundary condition: actuator and piezoelectric sensor are installed near stiff end;
(2) Zi You ?free boundary condition: actuator is arranged near free end, piezoelectric sensor is arranged on structure total length can measure more resonant frequency near the surface at 1/4 place of free end, if be arranged on structure total length can optimize the resonant frequency measuring odd-order near 1/2 place of free end.
The invention also discloses the detection method of described detection system, its step is as follows:
Signal generator connects voltage amplifier and inputs accumulation signal to actuator, actuator excites the vibratory response of flexible structure, the piezoelectric film sensor that flexible structure is pasted is experienced vibration and is caused strain variation, the voltage signal changed, voltage signal by Jiao Liu ?direct current auto-excitation type voltage up converting circuit drive plane Organic Light Emitting Diode, the brightness of plane Organic Light Emitting Diode can change with the change of voltage signal, the brightness of nitometer detection plane Organic Light Emitting Diode, vibration frequency corresponding to brightness maxima place is the resonant frequency of flexible structure.Embodiment 1:
As shown in Figure 1, be the structural representation of the present embodiment, wherein cantilever material is aluminium alloy, and laminated piezoelectric actuator model is AE0505D16, voltage amplifier be XE ?500, signal generator model is DG400.Be illustrated in figure 2 the circuit diagram of the present embodiment.
Figure 3 ?Fig. 5 can find along with frequency change, the brightness of OLED also occurs the power change of same trend reaching maximal value in the brightness of resonant frequency place thereupon.Figure 3 ?Fig. 5 be the shinny lab diagram of two to OLED near quadravalence resonance frequency value of test semi-girder respectively.The brightness of OLED is measured by nitometer, and naked eyes can differentiate obvious luminance difference.The result of Fig. 3 general light emitting diode under being simultaneously given in resonance frequency value, can see the visual advantage of out-of-plane Organic Light Emitting Diode.This experiment proof can change excited frequency quickly through adjustment signal generator, the brightness change of observation OLED, quick decision resonance frequency value.
Claims (7)
1. a flexible structure resonant frequency visual detecting system, is characterized in that comprising signal generator, voltage amplifier, actuator, piezoelectric sensor, friendship stream ?direct current auto-excitation type voltage up converting circuit, light emitting diode, nitometer; Described piezoelectric film sensor and actuator are arranged in flexible structure to be detected, signal generator, voltage amplifier are connected in turn with actuator, described piezoelectric film sensor by Jiao Liu ?direct current auto-excitation type voltage up converting circuit be connected with light emitting diode, nitometer is for detecting the brightness of light emitting diode.
2. flexible structure resonant frequency visual detecting system according to claim 1, is characterized in that described piezoelectric sensor is piezoelectric membrane.
3. flexible structure resonant frequency visual detecting system according to claim 1, is characterized in that described actuator is laminated piezoelectric actuator.
4. flexible structure resonant frequency visual detecting system according to claim 1, is characterized in that described light emitting diode is plane Organic Light Emitting Diode.
5. flexible structure resonant frequency visual detecting system according to claim 1, it is characterized in that two arbitrary boundary conditions for flexible structure, i.e. fixed boundary condition and free boundary condition, respectively advise actuator installation site and piezoelectric film sensor installation site as follows:
(1) Gu Ding ?free boundary condition: actuator and piezoelectric sensor are installed near stiff end;
(2) Zi You ?free boundary condition: actuator is arranged near free end, and piezoelectric sensor is arranged on structure total length near 1/4 place of free end or be arranged on 1/2 place of structure total length near free end.
6. flexible structure resonant frequency visual detecting system according to claim 1, it is characterized in that described Jiao Liu ?direct current auto-excitation type voltage up converting circuit be Jiao Liu ?Zhi Liu ?voltage amplifier.
7. a detection method for detection system as claimed in claim 1, is characterized in that step is as follows:
Signal generator connects voltage amplifier and inputs accumulation signal to actuator, actuator excites the vibratory response of flexible structure, the piezoelectric film sensor that flexible structure is pasted is experienced vibration and is caused strain variation, the voltage signal changed, voltage signal by Jiao Liu ?direct current auto-excitation type voltage up converting circuit drive plane Organic Light Emitting Diode, the brightness of plane Organic Light Emitting Diode can change with the change of voltage signal, the brightness of nitometer detection plane Organic Light Emitting Diode, vibration frequency corresponding to brightness maxima place is the resonant frequency of flexible structure.
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| CN107222821A (en) * | 2017-06-09 | 2017-09-29 | 京东方科技集团股份有限公司 | Combination electrode, acoustic sensor and manufacture method using it |
| CN108180979A (en) * | 2017-12-11 | 2018-06-19 | 杨松 | The device and method of unit status detection |
| CN108964517A (en) * | 2017-05-21 | 2018-12-07 | 天津大学（青岛）海洋工程研究院有限公司 | A kind of self-powered vibration frequency sensing system based on switched capacitor technique |
| CN108964515A (en) * | 2017-05-20 | 2018-12-07 | 天津大学（青岛）海洋工程研究院有限公司 | A kind of self-powered vibration frequency sensor based on synchronous switch inductive technologies in parallel |
| CN108955866A (en) * | 2017-05-21 | 2018-12-07 | 天津大学（青岛）海洋工程研究院有限公司 | A kind of piezoelectric vibration frequency sensor system based on biasing reverse circuit |
| CN108964516A (en) * | 2017-05-21 | 2018-12-07 | 天津大学（青岛）海洋工程研究院有限公司 | A kind of self-powered vibration frequency sensing system based on biasing reverse circuit |
| CN111207871A (en) * | 2020-03-02 | 2020-05-29 | 燕山大学 | System and method suitable for analyzing electromagnetic harmonic oscillating tooth transmission torque characteristics |
| CN114173913A (en) * | 2019-07-26 | 2022-03-11 | 罗门哈斯电子材料新加坡有限公司 | Self-powered component integrity indicator using piezoelectric sensors |
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| CN114173913A (en) * | 2019-07-26 | 2022-03-11 | 罗门哈斯电子材料新加坡有限公司 | Self-powered component integrity indicator using piezoelectric sensors |
| CN111207871A (en) * | 2020-03-02 | 2020-05-29 | 燕山大学 | System and method suitable for analyzing electromagnetic harmonic oscillating tooth transmission torque characteristics |
| CN111207871B (en) * | 2020-03-02 | 2020-11-10 | 燕山大学 | System and method suitable for analyzing electromagnetic harmonic oscillating tooth transmission torque characteristics |
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