WO2015089604A1 - Structural health monitoring system employing electromechanical impedance technology - Google Patents
Structural health monitoring system employing electromechanical impedance technology Download PDFInfo
- Publication number
- WO2015089604A1 WO2015089604A1 PCT/BR2014/000444 BR2014000444W WO2015089604A1 WO 2015089604 A1 WO2015089604 A1 WO 2015089604A1 BR 2014000444 W BR2014000444 W BR 2014000444W WO 2015089604 A1 WO2015089604 A1 WO 2015089604A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- transducer
- set forth
- frequency
- analog
- health state
- Prior art date
Links
- 230000036541 health Effects 0.000 title claims abstract description 9
- 238000012544 monitoring process Methods 0.000 title claims description 5
- 238000005516 engineering process Methods 0.000 title description 4
- 238000000034 method Methods 0.000 claims abstract description 22
- 238000005259 measurement Methods 0.000 claims abstract description 6
- 230000005284 excitation Effects 0.000 claims description 7
- 230000007613 environmental effect Effects 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 2
- 230000004044 response Effects 0.000 claims description 2
- 230000003068 static effect Effects 0.000 claims 2
- 230000000694 effects Effects 0.000 claims 1
- 238000013139 quantization Methods 0.000 abstract description 3
- 238000006073 displacement reaction Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000012805 post-processing Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- XOJVVFBFDXDTEG-UHFFFAOYSA-N Norphytane Natural products CC(C)CCCC(C)CCCC(C)CCCC(C)C XOJVVFBFDXDTEG-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000013079 data visualisation Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005316 response function Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/09—Analysing solids by measuring mechanical or acoustic impedance
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/32—Arrangements for suppressing undesired influences, e.g. temperature or pressure variations, compensating for signal noise
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
- G01N29/4472—Mathematical theories or simulation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/01—Indexing codes associated with the measuring variable
- G01N2291/018—Impedance
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/025—Change of phase or condition
- G01N2291/0258—Structural degradation, e.g. fatigue of composites, ageing of oils
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/0289—Internal structure, e.g. defects, grain size, texture
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/10—Number of transducers
- G01N2291/106—Number of transducers one or more transducer arrays
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/26—Scanned objects
- G01N2291/269—Various geometry objects
- G01N2291/2694—Wings or other aircraft parts
Definitions
- the technology herein relates to electronic sensing and analysis, and more particularly to methods, systems and techniques for acquiring the structural health state of an aircraft mechanical component based on ascertaining the mechanical impedance of the component.
- Aircraft parts can become stressed with use. While techniques are known for automatically analyzing changes in vibrational response, it would be helpful to be able to automatically sense and analyze changes in mechanical impedance using techniques that are less complicated, more efficient and less time consuming.
- Figure 1 shows a one-dimensional model of an example electromechanical impedance due to the interaction of a piezoelectric patch and a monitored structure.
- Figure 2 illustrates example phase displacement between the excitation sine wave v(t), applied to the transducer, and its correspondent circulating current i(t).
- Figure 3 shows example instantaneous power, s(t), consumed by the transducer
- Figures 4(a) and 4(b) illustrate example relationships between the components of the electrical impedance (4(a)), and the components of the consumed electrical power of the transducer (4(b)).
- Figure 5 is a schematic diagram illustrating an example of how the resistive part of the electromechanical impedance can be measured and calculated.
- Figure 6 is a schematic block diagram of an example non-limiting specialized data acquisition system used to measure the EMI FRF of each transducer in the monitoring network.
- Figure 7 illustrates example environmental effects of temperature causing frequency and/or amplitude shifts in the EMI FRF.
- Figure 8 is a flow chart describing an example non-limiting process implemented to measure each EMI FRF and assess possible damages.
- Figure 1 shows the well-known one-dimensional model representation of a mechanical system containing an integrated sensor-actuator piezoelectric patch.
- the solution of the wave equation for the PZT patch bonded to the structure leads to frequency-dependent electrical admittance given by Equation 1 :
- ⁇ ( ⁇ ) is the electrical admittance (inverse of electrical impedance)
- Z a and Z s are the PZT's and the structure's mechanical impedances
- 1 Y ⁇ is the complex Young's modulus of the PZT in the direction 1 under zero electric field
- d 31 is the piezoelectric coupling constant at zero stress
- ⁇ is the dielectric loss tangent of the piezoelectric patch
- a is a geometric constant of the PZT patch.
- Equation 4 presents this result:
- Equation 4 The first term of Equation 4 is invariant over the time and includes sufficient information about the phase displacement between v(t) and i(t).
- Figure 3 illustrates this term and it is commonly called average power.
- Equation 5 mathematically defines the average power as a function of the phase displacement between v(t) and i(t):
- FIG. 4(a) The mos impedance Z of the piezoelectric transducer is illustrated in Figure 4(a) where R represents the resistive (real) part of the impedance and X c the reactive (imaginary) part.
- Figure 4(b) illustrates the relations between the phase displacement ⁇ , the average power P, the reactive power Q, and the apparent power S.
- the resistance R can be determined by using Equation 6:
- FIG. 5 An example non-limiting specialized example circuit, illustrated in Figure 5, is able to directly measure ⁇ ( ⁇ ).
- a precision high speed analog multiplier 51 used to obtain s(t).
- Low pass filter 52 provides a precision gain regulation.
- RMS-to-DC converter 53 is used to obtain the RMS value of the circulating current in the transducer in the form of a constant voltage value (DC).
- Microcontroller 54 is used to coordinate the sensing network and to calculate R, by software, using Equation (6).
- the microcontroller 54 may execute software instructions stored in a non-transitory storage device such as a random access memory, read only memory, flash memory or the like.
- the Figure 5 circuit acquires the structural health state of an aircraft mechanical component performs measurements at each frequency point of interest by using a network of transducers and working each one simultaneously as actuator and sensor. Each transducer is individually excited by a sinusoidal, constant frequency and arbitrary amplitude, voltage waveform for each arbitrary frequency point used to interrogate the structure. Dedicated hardware executes an analogical (analog) quantization to measure electrical current and average electrical power consumed by each transducer. With these two variables, the electromechanical signature of the structure is obtained at different areas of the monitored structure.
- Computer system 61 implements the man-machine- interface (MMI). Several different interface communications may be implemented to communicate with microcontroller 61.
- the two analog to digital (AD) channels 62 do not require high sample rates, since P me rage and (effective are DC values. A sample rate of a few kSamples/s is more than enough.
- a programmable Digital Data Synthesis (DDS) 63 is used to generate a precise, frequency and amplitude, sine wave.
- DDS Digital Data Synthesis
- Digitally controlled solid state analog switches 64 are highly reliable; these switches individually activate/deactivate each transducer in the sensing network under the control of demultiplexer (decoder) 66 and the microcontroller 61. Shunt resistors 67 are used to sample de circulating current at each transducer.
- FIG. 8 A complete example non-limiting flowchart for damage assessment is illustrated in Figure 8.
- the MMI loads/sets the parameter for the current measurement and further calibrations may also be performed.
- all the processing takes place inside the microcontroller in one example embodiment.
- the post processing actions and damage assessments take place inside the computer system in this example embodiment.
- the system loads/sets parameters (71 ) and activates the PZT transducers.
- the system calculates a frequency point and then starts signal generation. Two kinds of signal acquisition (current and power are acquired and respectively averaged. R is then calculated straightforwardly from I and P. This process can be repeated for multiple frequency points. Once the process has been performed for each of plural frequency points as desired, the system compensates for environmental effects. Then, if the data acquisition is for baseline purposes, the results are stored. If not baseline, then the results are compared with previously stored baseline information to assess damage based on the baseline. If damage is detected, an alert can be issued automatically to a pilot, crew or maintenance person.
- the technology herein may be embodied as a method, system hardware, embedded firmware and or software as a whole product or as a set of parts that work together in order to achieve the same or similar goal,
- the software part can be organized into two main sets.
- the first, called firmware may be embedded in a microcontroller or any other processing system where preprocessing algorithms (averaging, analog and digital quantization and communication interfaces) are implemented to validate, correct and transfer the measurements to a computer system.
- the second set, called analysis software can operate on a single or multiple computer (stand-alone) or other processing system either atone or connected in a network where remote operation and data visualization is possible.
- Post-processing algorithms environmental effects compensation
- damage assessment can be combined to identify structural modifications (damages) at early stages.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Signal Processing (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Algebra (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Mathematical Physics (AREA)
- Pure & Applied Mathematics (AREA)
- Testing Or Calibration Of Command Recording Devices (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201480068944.0A CN106233135B (en) | 2013-12-16 | 2014-12-15 | Using the structural healthy monitoring system of electromechanical resistance technique |
EP14833109.3A EP3084417B1 (en) | 2013-12-16 | 2014-12-15 | Structural health monitoring system employing electromechanical impedance technology |
BR112016013821-0A BR112016013821B1 (en) | 2013-12-16 | 2014-12-15 | Structural integrity monitoring systems employing electromechanical impedance technology |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
USUS14/107,576 | 2013-12-16 | ||
US14/107,576 US9664649B2 (en) | 2013-12-16 | 2013-12-16 | Structural health monitoring system employing electromechanical impedance technology |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2015089604A1 true WO2015089604A1 (en) | 2015-06-25 |
Family
ID=52434455
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/BR2014/000444 WO2015089604A1 (en) | 2013-12-16 | 2014-12-15 | Structural health monitoring system employing electromechanical impedance technology |
Country Status (5)
Country | Link |
---|---|
US (1) | US9664649B2 (en) |
EP (1) | EP3084417B1 (en) |
CN (1) | CN106233135B (en) |
BR (1) | BR112016013821B1 (en) |
WO (1) | WO2015089604A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10149631B2 (en) * | 2015-07-24 | 2018-12-11 | Embraer S.A. | Structural health monitoring sensory system integrated to a self-adapting morphing system |
US10816436B2 (en) * | 2018-07-06 | 2020-10-27 | The Boeing Company | System for temperature insensitive damage detection |
CN109764982B (en) * | 2019-03-04 | 2024-04-26 | 广东省特种设备检测研究院珠海检测院 | Wireless piezoelectric sensor for structural health monitoring by piezoelectric impedance method |
DE102021106705A1 (en) | 2021-03-18 | 2022-09-22 | Technische Universität Braunschweig - Körperschaft des öffentlichen Rechts | Impedance analyzer |
CN113686966B (en) * | 2021-07-13 | 2023-08-18 | 中国船舶重工集团公司第七一五研究所 | Standing wave tube measuring method for decoupling characteristic parameters of underwater acoustic material |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6006163A (en) | 1997-09-15 | 1999-12-21 | Mcdonnell Douglas Corporation | Active damage interrogation method for structural health monitoring |
US7024315B2 (en) * | 2001-02-08 | 2006-04-04 | University Of South Carolina | In-situ structural health monitoring, diagnostics and prognostics system utilizing thin piezoelectric sensors |
US20100161283A1 (en) * | 2006-10-03 | 2010-06-24 | Xinlin Qing | Structural health monitoring network |
US7809513B2 (en) | 2007-04-16 | 2010-10-05 | Acellent Technologies, Inc. | Environmental change compensation in a structural health monitoring system |
US8042397B2 (en) * | 2007-05-16 | 2011-10-25 | The Boeing Company | Damage volume and depth estimation |
US7487059B2 (en) | 2007-06-21 | 2009-02-03 | The Boeing Company | Transducer health diagnostics for structural health monitoring (SHM) systems |
US8371170B2 (en) | 2008-02-13 | 2013-02-12 | National University Corporation Kyoto Institute Of Technology | Method and apparatus for diagnosing a damage in a structure |
US20090281736A1 (en) * | 2008-05-12 | 2009-11-12 | Hyeung-Yun Kim | Method and apparatus for concurrent positive and negative actuation in structural health monitoring systems |
DE112009004421T8 (en) * | 2009-02-25 | 2012-09-13 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | RFID scanning system without external power supply to query the structural health |
DE102009001472A1 (en) * | 2009-03-11 | 2010-09-16 | Endress + Hauser Flowtec Ag | Vibration-type transducers and in-line meter with such a transducer |
US8265889B2 (en) * | 2009-08-05 | 2012-09-11 | Acellent Technologies, Inc. | Integrated circuit system for controlling structural health monitoring processes and applications therefor |
US9217730B2 (en) * | 2010-05-17 | 2015-12-22 | Acellent Technologies, Inc. | Input-protected structural health monitoring system |
DE102010039017B4 (en) * | 2010-08-06 | 2017-09-21 | Robert Bosch Gmbh | Method and device for active damping of an acoustic transducer |
RU2589506C2 (en) * | 2011-05-02 | 2016-07-10 | Эндресс+Хаузер Флоутек Аг | Vibration-type measurement sensor and measuring system for measurement of density and/or percentage mass flow rate |
CN108181506A (en) * | 2013-05-09 | 2018-06-19 | 天津瑞奇外科器械股份有限公司 | Search the method and system of energy converter resonant frequency point |
-
2013
- 2013-12-16 US US14/107,576 patent/US9664649B2/en active Active
-
2014
- 2014-12-15 EP EP14833109.3A patent/EP3084417B1/en active Active
- 2014-12-15 CN CN201480068944.0A patent/CN106233135B/en active Active
- 2014-12-15 WO PCT/BR2014/000444 patent/WO2015089604A1/en active Application Filing
- 2014-12-15 BR BR112016013821-0A patent/BR112016013821B1/en active IP Right Grant
Non-Patent Citations (5)
Title |
---|
GYUHAE PARK ET AL: "Overview of piezoelectric impedance-based health monitoring and path forward", SHOCK AND VIBRATION DIGEST, SAGE PUBLICATIONS, INC, US, vol. 35, no. 6, 1 November 2003 (2003-11-01), pages 451 - 463, XP009177589, ISSN: 0583-1024 * |
NETO R M ET AL: "A low-cost electromechanical impedance-based shm architecture for multiplexed piezoceramic actuators", SHM. STRUCTURAL HEALTH MONITORING, SAGE PUBLICATIONS, XX, vol. 10, no. 4, 1 July 2011 (2011-07-01), pages 391 - 402, XP009183178, ISSN: 1475-9217 * |
PALOMINO L V ET AL: "Evaluation of the influence of sensor geometry and physical parameters on impedance-based structural health monitoring", SHOCK AND VIBRATION, vol. 19, no. 5, 2012, IOS PRESS NETHERLANDS, pages 811 - 823, XP002737431, ISSN: 1070-9622, DOI: 10.3233/SAV-2012-0690 * |
RIM MI-SUN ET AL: "Impedance-based damage assessment using piezoelectric sensors", SENSORS AND SMART STRUCTURES TECHNOLOGIES FOR CIVIL, MECHANICAL, AND AEROSPACE SYSTEMS 2011, SPIE, 1000 20TH ST. BELLINGHAM WA 98225-6705 USA, vol. 7981, no. 1, 24 March 2011 (2011-03-24), pages 1 - 7, XP060011440, DOI: 10.1117/12.880210 * |
ROBERTO MENDES FINZI NETO ET AL: "System for Structural Health Monitoring based on piezoelectric sensors/actuators", POWER ELECTRONICS CONFERENCE (COBEP), 2011 BRAZILIAN, IEEE, 11 September 2011 (2011-09-11), pages 365 - 371, XP031999286, ISBN: 978-1-4577-1644-7, DOI: 10.1109/COBEP.2011.6085180 * |
Also Published As
Publication number | Publication date |
---|---|
BR112016013821A2 (en) | 2020-11-03 |
BR112016013821B1 (en) | 2022-02-22 |
US20150168353A1 (en) | 2015-06-18 |
EP3084417A1 (en) | 2016-10-26 |
CN106233135A (en) | 2016-12-14 |
CN106233135B (en) | 2019-10-01 |
EP3084417B1 (en) | 2021-05-26 |
US9664649B2 (en) | 2017-05-30 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US9664649B2 (en) | Structural health monitoring system employing electromechanical impedance technology | |
CN107438758B (en) | Method and system for structural health monitoring with frequency synchronization | |
Finzi Neto et al. | A low-cost electromechanical impedance-based SHM architecture for multiplexed piezoceramic actuators | |
Budoya et al. | A comparative study of impedance measurement techniques for structural health monitoring applications | |
EP2035769A1 (en) | Vibration and condition monitoring system and the parts thereof | |
JP2907737B2 (en) | Apparatus for dynamically measuring the distance between facing surfaces of a rotor and a stator in a rotary machine | |
US7068041B2 (en) | Method and system for multi-frequency inductive ratio measurement | |
RU2686522C2 (en) | Method for real-time monitoring of operating conditions of capacitive sensor | |
Djemana et al. | Modelling and simulation of impedance-based damage monitoring of structures | |
GB2483339A (en) | System and method for monitoring health of electrical machines | |
JP5539762B2 (en) | Lightning arrester failure determination method | |
Priya et al. | Low frequency and boundary condition effects on impedance based damage identification | |
CN109143185A (en) | A kind of temperature-compensation method, power detection device and radar system | |
Tallman | Damage detection in nanofiller-modified composites with external circuitry via resonant frequency shifts | |
EP3329235A1 (en) | Multifunctional piezoelectric load sensor assembly | |
Liang et al. | Experimental evaluation of miniature impedance board for loosening monitoring of the threaded pipe connection | |
CN111579870B (en) | Structural member damage monitoring and accumulation degree diagnosis method | |
Martins et al. | Architecture of a remote impedance-based structural health monitoring system for aircraft applications | |
US20160084789A1 (en) | Method for inspecting composite material components | |
Saar et al. | Chirp-based piezo-impedance measurement | |
Ren et al. | The temperature effects on embedded PZT signals in structural health monitoring for composite structures with different thicknesses | |
RU2497142C1 (en) | Receiving hydroacoustic antenna and method of estimating amplitude-frequency characteristics of hydroacoustic receivers | |
RU2584719C1 (en) | Digital method of measuring parameters of piezoelectric elements | |
Kurnyta et al. | Assessment of sensor technologies for aircraft SHM systems | |
CN105758437B (en) | A kind of method and system based on frequency characteristic assessment sensor measurement uncertainty |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 14833109 Country of ref document: EP Kind code of ref document: A1 |
|
REEP | Request for entry into the european phase |
Ref document number: 2014833109 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2014833109 Country of ref document: EP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
REG | Reference to national code |
Ref country code: BR Ref legal event code: B01A Ref document number: 112016013821 Country of ref document: BR |
|
ENP | Entry into the national phase |
Ref document number: 112016013821 Country of ref document: BR Kind code of ref document: A2 Effective date: 20160615 |
|
REG | Reference to national code |
Ref country code: BR Ref legal event code: B01E Ref document number: 112016013821 Country of ref document: BR Kind code of ref document: A2 Free format text: EXPLIQUE A DIVERGENCIA NO NOME DOS INVENTORES CAMILA GIANINI GONSALES E DOMINGO ALVES RADE QUE CONSTA NA PUBLICACAO INTERNACIONAL WO 2015/089604 E O CONSTANTE DA PETICAO INICIAL NO 870160028356 |
|
REG | Reference to national code |
Ref country code: BR Ref legal event code: B01E Ref document number: 112016013821 Country of ref document: BR Kind code of ref document: A2 Free format text: EM ADITAMENTO A EXIGENCIA PUBLICADA NA RPI 2577, SOLICITA-SE QUE A EXIGENCIA SEJA RESPONDIDA CORRETAMENTE SOB CODIGO DE PETICAO 207, NUM PRAZO DE 60 DIAS, E QUE SEJA EFETUADO O PAGAMENTO DAS DUAS GRUS DE CODIGO 207, ESPECIFICO PARA ESSE TIPO DE SERVICO, CORRESPONDENTES AS DUAS EXIGENCIAS FORMULADAS (RPI 2577 E RPI 2587). |
|
ENP | Entry into the national phase |
Ref document number: 112016013821 Country of ref document: BR Kind code of ref document: A2 Effective date: 20160615 |