CN103693209B - A kind of aircraft corrosive environment monitoring method and implement device thereof - Google Patents
A kind of aircraft corrosive environment monitoring method and implement device thereof Download PDFInfo
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- CN103693209B CN103693209B CN201310696467.XA CN201310696467A CN103693209B CN 103693209 B CN103693209 B CN 103693209B CN 201310696467 A CN201310696467 A CN 201310696467A CN 103693209 B CN103693209 B CN 103693209B
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Abstract
The present invention discloses a kind of aircraft corrosive environment monitoring method and implement device thereof, belongs to monitoring structural health conditions field.Monitoring method of the present invention is by measuring multiple easy environmental parameters causing corrosion, determining the corrosive grade of environment, thus pass judgment on the health status of Flight Vehicle Structure, instruct engineering to take corresponding measure.Aircraft corrosive environment monitoring device of the present invention is made up of master control micro control module, measurement module, communication module and power module, and volume is little, energy consumption is low, and long term monitoring is carried out at each position being applicable to being arranged on aircraft.Periodical maintenance existing for aircraft can be become maintenance on demand by the present invention, improves efficiency, reduces cost.
Description
Technical field
The present invention relates to a kind of aircraft corrosive environment monitoring method and implement device thereof, belong to structural health monitoring technology field.
Background technology
The corrosion of Flight Vehicle Structure, refers to component under environment for use by chemistry or the accumulation chemical loss that occurs of electrochemical action passing in time and destruction.Its randomness is large, and type is extensive, and influence factor is numerous and interaction strong, can not avoid completely.The corrosion damage of aircraft directly affects residual life, concerns flight safety.But at the corrosion initial stage, corrosion location is difficult to detect, and after corrosion germinates, if do not controlled, will to obtain sooner than other lesion development again, more serious.Therefore, must active prevention, the generation of control corrosion rate and diffusion.
At present, at aerospace field, the corrosion monitoring of aircraft is mainly absorbed in the research and development of anticorrosive coating, utilizes various Dynamic Non-Destruction Measurement to find, locates corrosion, differentiate extent of corrosion.As technology such as ultrasonic imaging, magneto-optic imaging, infrared imagings, be all find corrosion when corroding and occurring, take corresponding remedial measures according to degree of impairment.Namely the focus of current concern is the Anti-corrosion design of aircraft, and the examination and repair after corroding, and the study on monitoring for the corrosive environment of aircraft is then almost blank.
The corrosive environment of aircraft monitor mainly pointer to the feature of Flight Vehicle Structure, monitoring device is installed at position corrosion easily occurring at some, environmental parameters around Real-time Collection, client building database is uploaded to after signal condition, to analyze the change of environment, the possibility that prediction corrosion occurs, safeguards aircraft as early as possible, avoids because corroding the loss caused as far as possible.
By monitoring the corrosive environment of aircraft, can constructing environment-erosion model, environmentally calculation of parameter goes out rate of corrosion, derives the corrosion condition of aircraft, to instruct engineering to safeguard, has both decreased unnecessary shutdown, in turn ensure that flight safety.
Summary of the invention
The present invention proposes a kind of aircraft corrosive environment monitoring method and implement device thereof.The method mainly measures the critical environments parameter easily causing aircraft corrosion by monitoring device, and via its rate of corrosion that may cause of calculated with mathematical model, and then infer the corrosive grade of environment.Wherein monitoring device is integrated with three kinds of sensors, can monitor five to the relevant environmental parameters of corrosion: temperature, relative humidity, MEBO ribbon gauze,
value and
concentration.
The present invention adopts following technical scheme for solving its technical matters:
A kind of aircraft corrosive environment monitoring method, comprises the steps:
(1) the position distribution aircraft corrosive environment monitoring device corroded easily is there is at aircraft, it can be used as sensor node, and add and converge node and form sensor network, the corrosive environment of Real-Time Monitoring total, the environmental parameters of measurement comprise temperature, relative humidity, MEBO ribbon gauze,
value and
concentration;
(2), when shutting down, user collects data, building database by converging node;
(3) user is by the data in analytical database, rule of thumb model
calculate the rate of corrosion that this environmental energy causes, wherein
rate of corrosion, unit
;
be
value;
chlorine ion concentration, unit
;
mEBO ribbon gauze, unit
;
temperature, unit
;
relative humidity;
be the coefficient of this empirical model, the data obtained by test specimen anticorrosive test calculate the coefficient value being suitable for measurand;
(4) rate of corrosion step (3) obtained with
the corrosiveness of the environment grade of middle division compares, and can make assessment, and judge that present stage safeguards the need of to aircraft on this basis from the health status of angle to aircraft of corrosion.
A kind of implement device of aircraft corrosive environment monitoring method, comprise master control micro control module, measurement module, communication module and power module: master control micro control module is directly connected with measurement module, the multiple sensors that control in measurement module are measured environmental parameters in real time; Master control micro control module utilizes built-in serial communication function parts to be directly connected with the conversion chip of communication module, realizes and extraneous wired or wireless data communication; Power module provides the operating voltage of master control micro-control and measurement, communication module.
Beneficial effect of the present invention is as follows:
The aircraft corrosive environment monitoring method that the present invention proposes, by measuring multiple easy environmental parameters causing corrosion, is determined the corrosive grade of environment, thus is passed judgment on the health status of Flight Vehicle Structure, instruct engineering to take corresponding measure.The aircraft corrosive environment monitoring device volume wherein related to is little, energy consumption is low, and long term monitoring is carried out at each position being applicable to being arranged on aircraft.Periodical maintenance existing for aircraft can be become maintenance on demand by the present invention, improves efficiency, reduces cost.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of apparatus of the present invention.
Fig. 2 (a) is the metering circuit figure of MEBO ribbon gauze sensor; Fig. 2 (b) is the metering circuit figure of electrochemical sensor.
Fig. 3 is aircraft corrosive environment monitoring sensor network diagram.
Fig. 4 is the flow chart of steps of monitoring method of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention is described in further details.
Add up aircraft environment for use and ground parking by inquiry, the environmental parameters of analyzing influence structure erosion.Humiture is the key factor that corrosion occurs, but based on the work characteristics of aircraft, the origin cause of formation of its structure erosion is many-sided.If the Humid Status of body structure surface, muriatic pollution are also the key factors that aerial metal corrodes.?
the occasion that concentration is higher, if chloride is deposited in aircraft outside face or is trapped in inside with condensed water, more easily forms electrolyte solution accelerated corrosion.In addition, by the impact of industrial pollution and aircraft tail gas, generally also also exist in environment
with
.When Flight Vehicle Structure surface wettability, these source of pollution can be water-soluble or react with water, makes solution
value changes, and this is also one of origin cause of formation causing corrosion.So, the present invention choose to temperature, relative humidity, MEBO ribbon gauze,
value and
the key parameter that concentration these five affects Flight Vehicle Structure corrosion carries out long term monitoring.Rely on Temperature Humidity Sensor, MEBO ribbon gauze sensor and electrochemical sensor to the monitoring of these parameters, MEBO ribbon gauze sensor wherein and electrochemical sensor belong to non-commercial sensor, for the present invention designs and produces.
Humiture integrated transducer: what choose here is
paster encapsulation Temperature Humidity Sensor.Sensitive member and signal processing circuit are integrated on one piece of micro-circuit board by sensor, export the digital signal of demarcating completely.
MEBO ribbon gauze sensor: MEBO ribbon gauze is the metal exposed time that continuous surface is moistening in atmosphere.According to
definition, MEBO ribbon gauze refers to that temperature exists
above, relative humidity higher than
time.Traditional method of measurement be the temperature of combined environment and relative humidity to estimate MEBO ribbon gauze, this and actual MEBO ribbon gauze have certain discrepancy, and better method is that design sensor is monitored it.The present invention has made resistance-type MEBO ribbon gauze sensor, employing standard
manufacturing technology, epoxy resin board is produced two copper interdigital electrodes be separated from each other.When drying, do not contact mutually between two electrodes, sensor output resistance is infinitely great; When having on precipitation or condensation vapor to sensor surface, form path between electrode, output resistance reduces greatly.Measured the resistance variations of this sensor by certain metering circuit, the MEBO ribbon gauze of environment can be extrapolated.To demonstrate sensor electrical die opening less for the observed data in some early stages, and transducer sensitivity is higher.So the MEBO ribbon gauze sensor electrical die opening of the design only has
even if only define some minute sized drops on the surface and also can be perceived.In addition, sensor needs to be chronically exposed in external environment condition, and the exposed damage that can be corroded very soon in atmosphere of copper electrode, protect so cover one deck gold on electrode again.This sensor bulk is little, lightweight, and the life-span is long, and the narrow space being adapted at aircraft uses.
Electrochemical sensor: the present invention has has also designed and produced electrochemical sensor and has been used for monitoring
concentration and
value, the principle of measurement of this sensor is similar to linear polarization technique.Being exposed in moist air when sensor or being in the place of ponding, can condense water membrane in its surface.This layer of moisture film has dissolved salt or other impurity defines necessarily
concentration and
the electrolyte solution of value, provides condition to electrochemical corrosion.During measurement, wait for that the corrosion potential of electrode is stablized, electrode reaction is in state of equilibrium; Polarize to the additional small voltage of working electrode, then the speed of forward and backward reaction is unequal, and polarization current also changes again.During work, sweep voltage is applied, Real-Time Monitoring outgoing current to the electrode of sensor.The observed data in early stage demonstrates, when electrolyte solution
concentration higher or
more hour, the electric current of generation is also larger, can be obtained in environment by the change of monitoring current for value
concentration and
value situation.Traditional measurement mechanism is all three-electrode system, is made up of working electrode, reference electrode and aux. electrode.Working electrode is the same with the electrode process of reference electrode, and their corrosion potential is close, and the polarization time is very short in addition, so identical material can be adopted to make this two electrodes; And because aux. electrode is only for completing power circuit when polarizing, same material also can be adopted to make.In addition, the present invention chooses wider electrode and serves as reference electrode and aux. electrode simultaneously, and narrower electrode is as working electrode, and namely one of this sensor wide narrow two electrode structures, instead of traditional three-electrode structure.So, this sensor be by
the bipolar electrode grating structure that duralumin is made, choosing the material identical with monitored target is corrosion condition in order to present aircraft better.During making, choosing epoxy resin board is substrate, is plated the film of one deck duralumin thereon securely, then be engraved on film in conjunction with the pattern of photoetching technique by gate-shaped electrode by the mask plate processed in advance by evaporation coating technique.One, the electrode of sensor is wide
, one wide
, between be separated by
.This size sensor is little, and material is identical with monitored target, is applicable to being applied in the corrosion monitoring of Flight Vehicle Structure.
Need sensor directly to contact with test environment to the measurement of environmental parameters, for this reason, the integral layout of apparatus of the present invention is designed to upper and lower two-layer.Sensor and corresponding metering circuit are placed in outside upper strata, and outside sensor is exposed to, and metering circuit part is protected by package casing; Lower floor is control circuit, realizes the management to whole device.Carry out circuit connection by contact pin between levels, play fixing effect simultaneously.Whole device volume little (
), use in the narrow space being adapted at aircraft.
Fig. 1 is the overall schematic diagram of device, is made up of master control micro control module, power module, measurement module and communication module, and above-mentioned sensor and metering circuit thereof belong to measurement module.Main control chip in master control micro control module is
, this chip internal is integrated with digital to analogy conversion
, analogue to digital conversion
and IC bus
module, can control sensor and complete measurement to different parameters.Temperature Humidity Sensor output digit signals in device, main control chip is connected with this sensor two line (data line, clock line), passes through
agreement carries out the collection of humiture data; And MEBO ribbon gauze and electrochemical sensor are analog measurement, need by external excitation, the D and A converter of main control chip is directly connected with two kinds of sensors and provides excitation.
Fig. 2 is the metering circuit schematic diagram of MEBO ribbon gauze and electrochemical sensor.Because these two kinds of sensors have low trigger level, low outgoing current, the work characteristics such as output signal dynamic range is large, its metering circuit needs appropriate design.The metering circuit of MEBO ribbon gauze sensor, as shown in Fig. 2 (a), applies driving voltage to it
, by bleeder circuit, resistance is converted into voltage, the voltage signal of bleeder circuit is through amplifying and obtaining output voltage after filtering
.The metering circuit of electrochemical sensor, as shown in Fig. 2 (b), applies driving voltage to it
, electrochemical reaction stablizes the polarization current produced between rear measurement the two poles of the earth, and polarization current is converted to voltage through change-over circuit again, amplifies and obtains output voltage after filtering process
.
The above special emphasis of metering circuit design is to the denoising of tiny signal and amplification: one is by rational grounding design, prevents because the error of current potential overbalance introducing; Secondly low biased op amp is adopted to carry out filtering and amplification to sensor output signal; On the other hand, the biased employing software compensation of sensor and circuit is eliminated.
The output signal of metering circuit directly and the D and A converter of main control chip
connect, data acquisition and storage.Main control chip has
's
with
's
, the take off data that can store more than 2000 time of adding up.Be set as every 30 minutes once if measured, being so uploaded to before client can continuous running 1000 hours.
Whole monitoring device is powered by power module, and supplying cell passes through
after direct current conversion, for main control chip and measurement, communication module provide operating voltage.Power consumption aspect,
power managed very advantageous, add in this application, the environmental parameters of Sensor monitoring changes physical quantity very slowly, so do not need measure and transmit data frequently, corresponding average power is also very low.As required, make it to enter mode of operation by the activated sensors that main control chip is regular: measurement environment parameter, signal condition, data store and transmission; And be in dormant state in all the other moment.The feature of this low-power consumption makes be guaranteed the service life of this device.
This device can carry out data communication with outside,
be built-in with two-way serial communication
module, these two parts are connected with the conversion chip in communication module, realize as required
or wireless telecommunications.
During use, in order to monitor the corrosive environment of total, as shown in Figure 4, position this device of distributing installation corroded easily occurs at aircraft, and continuous acquisition environmental parameters, is stored in this locality after signal condition to concrete steps flow chart.Regard each monitoring device as sensor node, so just constitute a sensor network between them.In order to realize the communication between whole system, also needing to add except each sensor node and converging node, as shown in Figure 3.Local data transfer is given and is converged node by the monitoring device of diverse location, converges each sensor node of node integrated management, and is in due course data upload.As when shutting down, user can pass through handheld device, as
, notebook etc., obtain all data, building database via convergence node.
User storage data is that method is as follows in order to the environmental parameters by obtaining is assessed the corrosive property of environment:
First,
give the method dividing corrosiveness of the environment grade in standard, namely by being determined at the standard metal in corrosive environment, the rate of corrosion as zinc divides corrosive grade, as shown in table 1.
Secondly, analyze the test environment parameter obtained, infer by following empirical model the rate of corrosion that this environment may cause:
Wherein
rate of corrosion, unit
;
be
value;
chlorine ion concentration, unit
;
mEBO ribbon gauze, unit
;
temperature, unit
;
relative humidity;
be coefficient every in model, test specimen be exposed in environment to be measured after corrosion, can be calculated each coefficient value by the data obtained.
Finally, the comparing in the rate of corrosion go out above calculated with mathematical model and table 1, can obtain the corrosiveness of the environment grade in this stage, and instruct engineering to judge that present stage safeguards the need of to aircraft on this basis.
Claims (2)
1. an aircraft corrosive environment monitoring method, is characterized in that, comprises the steps:
(1) the position distribution aircraft corrosive environment monitoring device corroded easily is there is at aircraft, using aircraft corrosive environment monitoring device as sensor node, and add convergence node formation sensor network, the corrosive environment of Real-Time Monitoring total, the environmental parameters of measurement comprise temperature, relative humidity, MEBO ribbon gauze,
value and
concentration;
(2), when shutting down, user collects data, building database by converging node;
(3) user is by the data in analytical database, rule of thumb model
calculate the rate of corrosion that this environmental energy causes, wherein
rate of corrosion, unit
;
be
value;
chlorine ion concentration, unit
;
mEBO ribbon gauze, unit
;
temperature, unit
;
relative humidity;
be the coefficient of this empirical model, the data obtained by test specimen anticorrosive test calculate the coefficient value being suitable for measurand;
(4) rate of corrosion step (3) obtained with
the corrosiveness of the environment grade of middle division compares, and can make assessment, and judge that present stage safeguards the need of to aircraft on this basis from the health status of angle to aircraft of corrosion.
2. the implement device of an aircraft corrosive environment monitoring method as claimed in claim 1, it is characterized in that, comprise master control micro control module, measurement module, communication module and power module: master control micro control module is directly connected with measurement module, the multiple sensors that control in measurement module are measured environmental parameters in real time; Master control micro control module utilizes built-in serial communication function parts to be directly connected with the conversion chip of communication module, realizes and extraneous wired or wireless data communication; Power module provides the operating voltage of master control micro-control and measurement, communication module.
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| CN103693209B true CN103693209B (en) | 2016-02-17 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2016191166A1 (en) | 2015-05-26 | 2016-12-01 | Sikorsky Aircraft Corporation | Systems and methods to assess corrosion risk |
| US10401319B2 (en) * | 2017-01-16 | 2019-09-03 | The Boeing Company | Structural health monitoring system |
| CN109269970A (en) * | 2018-10-16 | 2019-01-25 | 北京科技大学 | Metallic material corrosion On-Line Monitoring Information System under a kind of atmospheric environment |
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