CN113757552A - Carbon fiber wound gas cylinder and health state monitoring method thereof - Google Patents
Carbon fiber wound gas cylinder and health state monitoring method thereof Download PDFInfo
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- CN113757552A CN113757552A CN202111053081.8A CN202111053081A CN113757552A CN 113757552 A CN113757552 A CN 113757552A CN 202111053081 A CN202111053081 A CN 202111053081A CN 113757552 A CN113757552 A CN 113757552A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/002—Details of vessels or of the filling or discharging of vessels for vessels under pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/18—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge using photoelastic elements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2201/00—Vessel construction, in particular geometry, arrangement or size
- F17C2201/01—Shape
- F17C2201/0104—Shape cylindrical
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2201/00—Vessel construction, in particular geometry, arrangement or size
- F17C2201/03—Orientation
- F17C2201/035—Orientation with substantially horizontal main axis
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/32—Hydrogen storage
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- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention provides a carbon fiber wound gas cylinder which comprises a gas cylinder body, wherein n optical fibers with a plurality of grid points are uniformly wound on the gas cylinder body, the grid points are uniformly distributed on each optical fiber, and when the optical fibers are wound, n grid points are uniformly distributed on a radial cross section of the position of any grid point on the gas cylinder body, the grid points are distributed into n straight lines along the axial direction of the gas cylinder body, and the axial distances between every two adjacent grid points are the same. The fatigue state of a certain position of the gas cylinder and the overall health state of the gas cylinder are obtained by establishing a gas cylinder health state evaluation equation and measuring the local deformation condition of the gas cylinder by combining wavelength data transmitted back by the demodulation optical fiber.
Description
Technical Field
The invention belongs to the technical field of carbon fiber wound gas cylinders, and particularly relates to a carbon fiber wound gas cylinder and a health state monitoring method thereof.
Background
The volume change of the carbon fiber wound gas cylinder is a very important index of the health state of the gas cylinder, and the overlarge volume change of the gas cylinder is an important expression of fatigue of the gas cylinder. The method commonly used for detecting the volume change of the carbon fiber wound gas cylinder is a hydrostatic test, which is one of the contents of gas cylinder annual inspection, and for a gas cylinder containing hydrogen, the inspection is required to be performed every three years. The hydrostatic test needs to install the gas cylinder on special hydrostatic test facility, annual check interval time overlength, and the operation is inconvenient moreover, can not accomplish real-time monitoring, also can not judge the health status of gas cylinder according to the gas cylinder volume change who records.
For example, publication No. CN111209693A discloses a method for evaluating the burst strength of a gas cylinder after being impacted by a foreign object, which comprises the steps of firstly carrying out secondary development on a carbon fiber composite material constitutive structure based on ABAQUS software, and establishing a finite element analysis model; and carrying out finite element analysis on the gas cylinder by using ABAQUS software based on the finite element analysis model, and evaluating the maximum internal pressure which can be borne by the gas cylinder after the gas cylinder is impacted by a foreign object, namely the bursting strength value of the gas cylinder after the gas cylinder is impacted by the foreign object.
It is therefore desirable to provide a carbon fiber wrapped gas cylinder and a method of monitoring the health status thereof to address the above problems.
Disclosure of Invention
The invention aims to provide a carbon fiber wound gas cylinder and a method for monitoring the health state of the gas cylinder.
The invention provides the following technical scheme:
the carbon fiber wound gas cylinder is characterized by comprising a gas cylinder body, wherein n strips of optical fibers with a plurality of grid points are uniformly wound on the gas cylinder body, the grid points are uniformly distributed on each optical fiber, and the optical fibers are wound to ensure that n grid points and grid points are uniformly distributed on a radial section of the position of any grid point on the gas cylinder body and are arranged in the axial direction of the gas cylinder body to form n straight lines, and the axial distance between every two adjacent grid points is the same.
Preferably, an L-shaped sleeve for preventing the optical fiber from being broken is arranged at the corner of the bottleneck of the gas cylinder body.
Preferably, n optical fibers are spirally wound or snakelike wound.
A method for monitoring the health state of a carbon fiber wound gas cylinder is characterized by comprising the following steps:
s1: winding an optical fiber with a grid point on the gas cylinder, and measuring a central wavelength initial value of the grid point by using an optical fiber demodulator;
s2: collecting a plurality of groups of data every second, calculating the circumferential strain and the axial strain of the grid point according to a grid point strain formula, and carrying out normalization processing on the mean value of the circumferential strain and the axial strain of the grid point by combining the strain upper limit of the grid point, wherein:
mean circumferential strain normalization, noted as:
axial strain mean normalization, noted as:
in the formula, xijIs the circumferential strain of the grid point, yijThe axial strain of the grid point is represented by i 1,2,3, …, n, j 1,2,3,4, E is the upper limit of the self-strain of the grid point, and xij,yij∈[0,E]，x1And y1Has a variation range of [0,1 ]]；
S3: establishing integral volume change coefficient K of gas cylinder according to circumferential strain and axial strain1The equation of (2):
K1＝ax1+by1 (4)；
wherein, K1∈[0,1]；
S4: establishing a circumferential and axial health deviation coefficient K according to a circumferential and axial deformation proportion of the gas cylinder2The equation of (2):
wherein, K2∈[0,1]；
S5: establishing global local variation fracture degree coefficient K by utilizing circumferential local variation coefficient3The equation of (c):
K3＝max1≤i≤n{kim}-min1≤i≤4{kim} (6)，
in the formula, kim＝max1≤j≤4{xij}-min1≤j≤4{xijThe local deformation coefficient is used for reflecting local deformation of the circumference where the grid points are located, wherein i is 1,2,33∈[0,1]；
S6: establishing global local variation fracture degree coefficient K by utilizing axial local variation coefficient4The equation of (c):
K4＝max1≤j≤n{kjm}-min1≤j≤n{kjm} (7)，
in the formula, kjm＝max1≤i≤n{yij}-min1≤i≤n{yijThe j is 1,2,3,4, K4∈[0,1]；
S7: by K1、K2、K3、K4Comprehensively establishing an equation of the overall health value K of the gas cylinder:
K＝αK1+βK2+γK3+δK4 (8)，
wherein α ═ am, β ═ bm, γ ═ a (1-m), δ ═ b (1-m),
the sum of the four coefficients of alpha, beta, gamma and delta is 1.
S8: and evaluating the health state of the gas cylinder according to the overall health value K of the gas cylinder, wherein the larger the value of K is, the worse the health degree of the gas cylinder is.
Preferably, the gate point strain formula is:
in the formula: delta lambdaBAs central wavelength offset, PeIs the effective elasto-optic coefficient of the fiber.
Preferably, in S1, when the initial value of the central wavelength of the grating point is measured by the fiber optic demodulator, at least 10 groups of data of the central wavelength of the reflected light are collected for each grating point, and the average value is taken as the initial value of the central wavelength of the point.
Preferably, in S2, the real-time data is acquired at a frequency of at least 20Hz/S, and at least 20 sets of data are acquired per second.
Preferably, in S7, m ∈ (0, 1).
The invention has the beneficial effects that:
1. the optical fiber has small volume and can be buried between the gas cylinder body and the carbon fiber winding layer. Moreover, the optical fiber does not need to be supplied with power, so that long-term stable measurement data of the optical fiber can be ensured; data can be obtained in real time only by connecting demodulation instrument equipment, the local deformation of the gas cylinder and the overall volume change of the gas cylinder can be measured, and the real-time performance is another great advantage.
2. The gas cylinder can generate deformation different from other positions at the weak part before fatigue damage, so that a plurality of optical fibers need to be deployed for winding, the survival rate of the optical fibers is reduced due to too few optical fibers, the cost is increased due to too many optical fibers, and the four optical fibers are spirally wound on the gas cylinder, so that the cross section of a grid area can be ensured to obtain strain data of four point positions simultaneously on the premise of ensuring the cost, and the obtained data has the advantage of being capable of measuring local deformation;
3. the interface of the optical fiber is thrown out from the bottleneck, and the corner of the bottleneck in front of the interface is a point at which the optical fiber is easy to break;
4. the algorithm can realize calculation of data obtained through each optical fiber grating point to obtain a gas cylinder local deformation monitoring method, the health state of the gas cylinder can be visually judged through the monitoring method, the health state of the gas cylinder is quantized into a health value, an alarm system can be matched more conveniently, when deformation is abnormal, an alarm is given, if abnormal alarm does not occur, weak positions can be located, and the method has a very large reference value for practical application and maintenance of the gas cylinder.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of the gas cylinder of the present invention;
FIG. 2 is a schematic side view of the cylindrical portion of the gas cylinder of the present invention in an expanded configuration;
FIG. 3 is a schematic view of the cylindrical portion of the cylinder of the present invention in circumferential cross-section;
FIG. 4 is a graph of the circumferential stress versus the axial stress of the gas cylinder of the present invention;
FIG. 5 is a graph showing the relationship between the K value and the number of fatigue tests according to the present invention;
fig. 6 is a schematic structural diagram of the gas cylinder with the optical fiber spiral patch of the invention.
Detailed Description
As shown in fig. 1-3, the carbon fiber wound gas cylinder provided by the invention comprises a gas cylinder body 1, n optical fibers 2 uniformly distributed with a plurality of grid points 3 are uniformly wound on the gas cylinder body 1, the optical fibers 2 are spirally wound or snakelike wound, the grid points 3 of the optical fibers 2 are attached to a gas cylinder liner through glue, when the gas cylinder expands, a grid area is driven to stretch, so that the central wavelength of reflected light obtained through demodulation changes, and the strain of the grid area (the grid area is the area where the grid points are located) is obtained. The grid points 3 are uniformly distributed on each optical fiber 2, and when the optical fibers 2 are wound, n grid points 3 are uniformly distributed on a radial section of the position of any grid point 3 on the gas cylinder body 1, the grid points 3 are distributed into n straight lines along the axial direction of the gas cylinder body 1, and the axial distances between every two adjacent grid points 3 are the same; the L-shaped sleeve 4 for preventing the optical fiber 2 from being broken is arranged at the corner of the bottleneck of the gas cylinder body 1, so that the optical fiber 2 at the position can be protected in the subsequent carbon fiber winding process, and the influence of the shearing force of the carbon fiber is reduced.
The first embodiment is as follows:
as shown in fig. 1-3, the carbon fiber wound gas cylinder provided by the invention comprises a gas cylinder body 1, four optical fibers 2 with a plurality of grid points 3 are uniformly wound on the gas cylinder body 1, wherein the four optical fibers 2 are spirally wound or snakelike wound, the plurality of grid points 3 are uniformly distributed on each optical fiber 2, when the optical fibers 2 are wound, four grid points 3 are uniformly distributed on a radial cross section of the position of any grid point 3 on the gas cylinder body 1, the grid points 3 are distributed into four straight lines along the axial direction of the gas cylinder body 1, and the axial distances between two adjacent grid points 3 are the same (the grid points 3 of the optical fibers 2 are attached to a gas cylinder liner through glue, when the gas cylinder expands, the grid area is driven to stretch, so that the center wavelength of the demodulated reflected light changes, and the strain of the grid area at the position is obtained. The L-shaped sleeve 4 for preventing the optical fiber 2 from being broken is arranged at the corner of the bottleneck of the gas cylinder body 1, so that the optical fiber 2 at the position can be protected in the subsequent carbon fiber winding process, and the influence of the shearing force of the carbon fiber is reduced.
A method for monitoring the health state of a carbon fiber wound gas cylinder comprises the following steps:
s1: winding an optical fiber with grid points on the gas cylinder, and measuring the initial value of the central wavelength of the grid points by using an optical fiber demodulator, wherein when the initial value of the central wavelength of the grid points is measured by using the optical fiber demodulator, at least 10 groups of reflected light central wavelength data are collected at each grid point, and the average value is taken as the initial value of the central wavelength of the point.
S2: collecting a plurality of groups of data every second, calculating the circumferential strain and the axial strain of the grid point according to a grid point strain formula, and carrying out normalization processing on the mean value of the circumferential strain and the axial strain of the grid point by combining the strain upper limit of the grid point, wherein the data collection frequency is at least 20Hz/s, and at least 20 groups of data are collected every second. Wherein:
the gate point strain formula is:
in the formula: delta lambdaBAs central wavelength offset, PeIs the effective elasto-optic coefficient of the fiber.
Mean circumferential strain normalization, noted as:
axial strain mean normalization, noted as:
in the formula, xijIs the circumferential strain of the grid point, yijThe axial strain of the grid point is represented by i 1,2,3, …, n, j 1,2,3,4, E is the upper limit of the self-strain of the grid point, and xij,yij∈[0,E]，x1And y1Has a variation range of [0,1 ]]；
S3: establishing integral volume change coefficient K of gas cylinder according to circumferential strain and axial strain1The equation of (2):
K1＝ax1+by1 (4)；
wherein, K1∈[0,1]；
S4: establishing a circumferential and axial health deviation coefficient K according to a circumferential and axial deformation proportion of the gas cylinder2The equation of (2):
wherein, K2∈[0,1]；
S5: establishing global local variation fracture degree coefficient K by utilizing circumferential local variation coefficient3The equation of (c):
K3＝max1≤i≤n{kim}-min1≤i≤4{kim} (6)，
in the formula, kim＝max1≤j≤4{xij}-min1≤j≤4{xijThe local deformation coefficient is used for reflecting local deformation of the circumference where the grid points are located, wherein i is 1,2,33∈[0,1]；
S6: establishing global local variation fracture degree coefficient K by utilizing axial local variation coefficient4The equation of (c):
K4＝max1≤j≤n{kjm}-min1≤j≤n{kjm} (7)，
in the formula, kjm＝max1≤i≤n{yij}-min1≤i≤n{yijThe j is 1,2,3,4, K4∈[0,1]；
S7: by K1、K2、K3、K4Comprehensively establishing an equation of the overall health value K of the gas cylinder:
K＝αK1+βK2+γK3+δK4 (8)，
wherein α ═ am, β ═ bm, γ ═ a (1-m), δ ═ b (1-m),
m belongs to (0,1), m is the ratio of the diameter to the length of the gas cylinder (the longer the gas cylinder is, the larger the influence of circumferential strain on the whole health of the gas cylinder is), and the sum of four coefficients of alpha, beta, gamma and delta is 1.
S8: and evaluating the health state of the gas cylinder according to the overall health value K of the gas cylinder, wherein the larger the value of K is, the worse the health degree of the gas cylinder is.
Example two:
the difference between this embodiment and the first embodiment is that in the formula (4), a takes a value of 0.7, and b takes a value of 0.3. The value taking method comprises the following steps:
a circumferential stress and axial stress curve diagram of the gas cylinder in normal operation is obtained through experiments, as shown in fig. 4, according to the circumferential stress and axial stress curve diagram, the ratio of the circumferential stress to the axial stress of the cylindrical part of the gas cylinder is about 7:3, therefore, the a is 0.7, the b is 0.3, and the overall volume change coefficient is obtained:
K1＝0.7x1+0.3y1，
the four coefficients of α, β, γ, δ take the values:
α＝0.7m，
β＝0.3m，
γ＝0.7(1-m)，
δ＝0.3(1-m)；
the possible value of K is (0,1), a relation curve graph between the K value and the fatigue test times is obtained according to the gas cylinder fatigue test, and as shown in fig. 5, the following evaluation rules can be obtained by taking 10000, 7500 and 3000 as boundary points:
example three:
the difference between the embodiment and the second embodiment is that the four optical fibers are spirally wound and attached, as shown in fig. 6, the circumferential included angle between the optical fiber 2 and the gas cylinder main body 1 is θ, the extension of the circumferential grid region (grid point) of the gas cylinder is Δ ∈ cos θ, and the extension of the axial grid region of the gas cylinder is Δ ∈ sin θ.
Example four:
the difference between the present embodiment and the third embodiment is that alarm monitoring is respectively set for a single grid point, four grid points of a section, and a cylindrical portion of the gas cylinder body 1, and the specific method is as follows:
1. aiming at a certain single grid point, setting the warning elongation delta epsilonmaxWhen the elongation of the gate region is larger than delta epsilonmaxIf so, triggering an alarm system;
2. aiming at four grid points of a certain section, calculating the variance of the axial grid region elongation delta epsilon sin theta, and when the variance is larger than a critical value, considering that the stress around the section is uneven, and triggering an alarm system;
3. under the normal condition after the gas cylinder is inflated, the pressure at each part of the cylinder wall of the cylindrical part is the same, if the two alarm conditions do not occur, the deformation quantity at each grid area is in an acceptable range, but the possibility that a certain section of the cylinder expands compared with the whole cylinder can occur, so that the expansion position can be found by the following method. The circumferential elongations delta epsilon cos theta of four grid regions of a certain section are averaged to obtain delta epsilonaThe diameter of the gas cylinder is D, and the elongation of the perimeter of the section of the gas cylinder is pi D delta epsilonaThe variation of diameter is D [ Delta ] [ epsilon ]aFurther, the volume change Δ V in this segment can be obtained. This results in a change in volume of the section of cylinder at each set of four gates. The volume change of each section is set with a warning expansion value delta VmaxIf the volume change of a certain section exceeds the warning expansion value delta VmaxIf the volume expansion of the section is not uniform, an alarm system is triggered.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides a carbon fiber winding gas cylinder, its characterized in that, includes gas cylinder body (1), evenly twine on gas cylinder body (1) and have n strip optic fibre (2) that have a plurality of bars point (3), a plurality of bars point (3) equipartitions are established on every optic fibre (2), twine guarantee during optic fibre (2) the equipartition is equipped with n bars point (3), bars point (3) and follows on gas cylinder body (1) arbitrary bars point (3) the radial cross-section of position the axial of arranging into n straight lines and adjacent two bars point (3) axial interval between the same.
2. The carbon fiber wrapped gas cylinder according to claim 1, characterized in that an L-shaped sleeve (4) for preventing the optical fiber (2) from breaking off is provided at a bottleneck corner of the gas cylinder body (1).
3. Carbon fiber wound gas cylinder according to claim 1, characterized in that n optical fibers (2) are applied with a spirally wound or a serpentine wound cloth.
4. A method of monitoring the health of a carbon fiber wrapped gas cylinder suitable for use in claim 1, comprising the steps of:
s1: winding an optical fiber with a grid point on the gas cylinder, and measuring a central wavelength initial value of the grid point by using an optical fiber demodulator;
s2: collecting a plurality of groups of data every second, calculating the circumferential strain and the axial strain of the grid point according to a grid point strain formula, and carrying out normalization processing on the mean value of the circumferential strain and the axial strain of the grid point by combining the strain upper limit of the grid point, wherein:
mean circumferential strain normalization, noted as:
axial strain mean normalization, noted as:
in the formula, xijIs the circumferential strain of the grid point, yijThe axial strain of the grid point is represented by i 1,2,3, …, n, j 1,2,3,4, E is the upper limit of the self-strain of the grid point, and xij,yij∈[0,E]，x1And y1Has a variation range of [0,1 ]]；
S3: establishing integral volume change coefficient K of gas cylinder according to circumferential strain and axial strain1The equation of (2):
K1＝ax1+by1 (4)；
wherein, K1∈[0,1]；
S4: establishing a circumferential and axial health deviation coefficient K according to a circumferential and axial deformation proportion of the gas cylinder2The equation of (2):
wherein, K2∈[0,1]；
S5: establishing global local variation fracture degree coefficient K by utilizing circumferential local variation coefficient3The equation of (c):
K3＝max1≤i≤n{kim}-min1≤i≤4{kim} (6)，
in the formula, kim＝max1≤j≤4{xij}-min1≤j≤4{xijThe local deformation coefficient is used for reflecting local deformation of the circumference where the grid points are located, wherein i is 1,2,33∈[0,1]；
S6: establishing global local variation fracture degree coefficient K by utilizing axial local variation coefficient4The equation of (c):
K4＝max1≤j≤n{kjm}-min1≤j≤n{kjm} (7)，
in the formula, kjm＝max1≤i≤n{yij}-min1≤i≤n{yijThe j is 1,2,3,4, K4∈[0,1]；
S7: by K1、K2、K3、K4Comprehensively establishing an equation of the overall health value K of the gas cylinder:
K＝αK1+βK2+γK3+δK4 (8)，
wherein α ═ am, β ═ bm, γ ═ a (1-m), δ ═ b (1-m),
the ratio of the diameter to the length of the gas cylinder, and the sum of four coefficients of alpha, beta, gamma and delta is 1;
s8: and evaluating the health state of the gas cylinder according to the overall health value K of the gas cylinder, wherein the larger the value of K is, the worse the health degree of the gas cylinder is.
5. The method for monitoring the health state of the carbon fiber-wrapped gas cylinder according to claim 4, wherein the grid point strain formula is as follows:
in the formula: delta lambdaBAs central wavelength offset, PeBeing optical fibresEffective elasto-optic coefficient of (c).
6. The method for monitoring the health status of the carbon fiber-wrapped gas cylinder according to claim 4, wherein in step S1, when the initial value of the central wavelength of the grating point is measured by the fiber optic demodulator, at least 10 groups of reflected light central wavelength data are collected for each grating point, and the average value is taken as the initial value of the central wavelength of the point.
7. The method for monitoring the health state of the carbon fiber wound gas cylinder according to claim 4, wherein in the step S2, the acquisition frequency of the real-time data is at least 20Hz/S, and at least 20 groups of data are acquired per second.
8. The method for monitoring the health status of a carbon fiber-wrapped gas cylinder according to claim 4, characterized in that in S7, m e (0, 1).
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114062115A (en) * | 2021-12-04 | 2022-02-18 | 江苏省特种设备安全监督检验研究院 | Carbon fiber winding gas cylinder deformation measurement experiment method |
| CN115218114A (en) * | 2022-07-11 | 2022-10-21 | 山东丰金新能源科技有限公司 | Pressure monitoring device and monitoring method for vehicle-mounted carbon fiber hydrogen storage bottle |
| CN115790720A (en) * | 2022-11-30 | 2023-03-14 | 大连理工大学 | Health monitoring system and method for reusable aerospace low-temperature liquid oxygen composite material storage box structure |
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| CN115790720A (en) * | 2022-11-30 | 2023-03-14 | 大连理工大学 | Health monitoring system and method for reusable aerospace low-temperature liquid oxygen composite material storage box structure |
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