CN114111897A - Device and method for monitoring automatic fiber laying process - Google Patents
Device and method for monitoring automatic fiber laying process Download PDFInfo
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- CN114111897A CN114111897A CN202111351964.7A CN202111351964A CN114111897A CN 114111897 A CN114111897 A CN 114111897A CN 202111351964 A CN202111351964 A CN 202111351964A CN 114111897 A CN114111897 A CN 114111897A
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- 239000000835 fiber Substances 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 70
- 230000008569 process Effects 0.000 title claims abstract description 56
- 238000012544 monitoring process Methods 0.000 title claims abstract description 44
- 239000013307 optical fiber Substances 0.000 claims abstract description 98
- 229920001169 thermoplastic Polymers 0.000 claims abstract description 87
- 239000004416 thermosoftening plastic Substances 0.000 claims abstract description 87
- 239000002131 composite material Substances 0.000 claims abstract description 86
- 238000004519 manufacturing process Methods 0.000 claims abstract description 19
- 230000007246 mechanism Effects 0.000 claims description 41
- 230000006835 compression Effects 0.000 claims description 13
- 238000007906 compression Methods 0.000 claims description 13
- 230000009471 action Effects 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 7
- 238000012806 monitoring device Methods 0.000 claims description 7
- 229920002379 silicone rubber Polymers 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 claims description 3
- 238000010008 shearing Methods 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 9
- 238000000465 moulding Methods 0.000 abstract description 5
- 230000035882 stress Effects 0.000 description 14
- 238000001723 curing Methods 0.000 description 8
- 230000008859 change Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000001931 thermography Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000007711 solidification Methods 0.000 description 1
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- 238000003878 thermal aging Methods 0.000 description 1
- 238000001029 thermal curing Methods 0.000 description 1
- 239000012815 thermoplastic material Substances 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
- G01D11/30—Supports specially adapted for an instrument; Supports specially adapted for a set of instruments
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Abstract
The invention discloses a device and a method for monitoring an automatic fiber laying process, and belongs to the field of thermoplastic composite material manufacturing. The method adopts the advantages of small volume, high precision and the like of the fiber grating sensor, and the fiber grating sensor is laid between layers of the thermoplastic composite material flat plate to realize the bonding of the fiber grating sensor and the thermoplastic pre-tightening material; and the optical fiber sensor is steered by the directional wheel, so that the stress field and the temperature field of the plurality of thermoplastic composite materials in the manufacturing and curing processes can be monitored in real time by one optical fiber grating sensor. The method is suitable for the field of thermoplastic composite material manufacturing, and provides quantitative data support for the molding process through real-time monitoring of a stress field and a temperature field in the manufacturing process.
Description
Technical Field
The invention relates to monitoring of a stress field and a temperature field in a laying process of a thermoplastic prepreg tape, in particular to a device and a method for monitoring an automatic wire laying process, and belongs to the field of thermoplastic composite material manufacturing.
Background
The thermoplastic composite material is a composite material formed by external pressure, has equal or even excellent mechanical properties compared with a thermosetting composite material, omits complex links such as autoclave and the like in the manufacturing process, saves the manufacturing cost of the composite material, and has great development prospect.
In the manufacturing process of the thermoplastic composite material flat plate, the molded surface precision of the molded part and the input parameters of the automatic filament paving machine during paving are closely related, and the parameters comprise the temperature of a heating source of the prepreg tape, the speed of the press roll, the pressure of the press roll and the like. Wherein the temperature of the heating source is selected to have an important effect on the formation of the thermoplastic composite material, and if the temperature of the heating source is too high, thermal aging or curing of the resin matrix can occur; too low a temperature may result in incomplete melting of the thermoplastic composite material and insufficient viscosity, resulting in localized defects in the material. The pressure and the speed of the compression roller are also important factors influencing the molding of the thermoplastic composite material, if the pressure or the speed is too high, the internal temperature of the composite material is too high, and a large residual stress is generated in the cooling process, so that the composite material has defects of warping, wrinkling and the like; if the pressure is too low, the adhesion between the materials of each layer is incomplete, so that the materials slide and the like, and the subsequent laying of the materials is influenced.
The existing thermoplastic composite material flat plate manufacturing device reflects the pressure application condition of the thermoplastic composite material in the laying process through a sensor arranged on a pressure roller, and monitors the surface temperature change condition of the composite material by using a thermal imaging device. However, this method can only reflect the pressure applied during the manufacturing process of the thermoplastic composite material and the surface temperature change of the composite material, and the release of the residual stress during the curing process of the thermoplastic composite material is the result of the internal temperature and stress action, so that the pressure and temperature parameters during the laying process of the thermoplastic composite material flat plate can not be adjusted according to the pressure roller sensor and the thermal imaging monitoring result to obtain better profile accuracy.
Disclosure of Invention
The invention provides a device and a method for automatically monitoring a filament laying process, aiming at the problem that the conventional thermoplastic composite material flat plate manufacturing device cannot reflect the internal temperature and pressure of a composite material, and aiming at realizing the real-time monitoring of a temperature field and a stress field of the thermoplastic material in the manufacturing and curing processes and providing quantitative data support for the molding process of the thermoplastic composite material.
The purpose of the invention is realized by the following technical scheme:
the device for automatically monitoring the fiber laying process, disclosed by the invention, has the advantages of small volume, high precision and the like of the fiber grating sensor, and the fiber grating sensor is laid between the layers of the thermoplastic composite material flat plate, so that the monitoring of the internal stress and the temperature of the thermoplastic composite material flat plate in the laying and curing processes is realized, and the device provides guidance for parameter input when the thermoplastic composite material flat plate is laid.
The invention discloses a monitoring device for an automatic fiber laying process, which comprises a thermoplastic composite material prepreg tape fixing workbench, an optical fiber pretightening force adjusting mechanism, a thermoplastic composite material prepreg tape laying device, an optical fiber guiding mechanism, an optical Fiber Bragg Grating (FBG) sensor and an optical fiber grating demodulating system.
The thermoplastic composite prepreg tape fixing workbench is used for thermoplastic composite prepreg.
The optical fiber pretightening force adjusting mechanism comprises a damper and an optical fiber orientation wheel, the optical fiber pretightening force adjusting mechanism can be fixed in the groove of the thermoplastic composite prepreg tape fixing workbench according to the actual laying requirement, the damper is used for adjusting the pretightening force applied by the optical fiber grating sensor, and the orientation wheel is used for determining the direction of an optical fiber and preventing the direction deviation generated under the action of factors such as external environment.
The optical fiber guide mechanism is used for steering the optical fiber sensor, protecting an energy signal of the sensor from being lost in the steering process, and monitoring a plurality of prepreg tapes of one optical fiber.
The thermoplastic composite material prepreg tape laying device is used for laying and pressing the prepreg tape so as to ensure that the fiber grating sensor is completely attached to the thermoplastic composite material prepreg tape, realize synchronous deformation with the prepreg tape and achieve the purpose of measuring strain.
The fiber Bragg grating sensor is used for measuring the changes of a temperature field and a stress field of the prepreg tape in the laying, cooling and curing processes in real time.
The fiber grating demodulation system comprises a fiber grating demodulator, a computer terminal and corresponding demodulation software, and is used for demodulating an optical signal value generated by fiber grating measurement into an electric signal and a strain value, so that real-time monitoring of the thermoplastic composite material in the manufacturing process is realized.
The groove edge of the groove of the thermoplastic composite prepreg tape fixing workbench is provided with scales, the optical fiber pre-tightening force adjusting mechanism and the optical fiber guiding mechanism are movable mechanisms which can be fixed in the groove in a sliding manner, the number of the modules can be adjusted according to actual needs and the length of optical fibers, and the positions of the modules can be adjusted according to the laying positions of the thermoplastic composite materials and nodes to be monitored.
The optical fiber pretightening force adjusting mechanism comprises a damper and a directional wheel, a certain pretightening force is given to the optical fiber through the damper to keep the optical fiber in tension, and the optical fiber can be kept parallel under the action of the laying compression roller in the laying process through the directional wheel to ensure the monitoring accuracy.
The wheel disc of the optical fiber guide wheel and the base support platform are movable, the size of the guide wheel can be changed according to the actual monitoring width of the optical fiber, and flexible monitoring is achieved.
The compression roller of the thermoplastic composite material prepreg tape laying device is made of silicon rubber, the fiber grating sensor is required to be arranged between two thermoplastic composite material prepreg tapes in the laying process, and the direction of the fiber grating sensor is parallel to that of the thermoplastic prepreg tapes, so that the thermoplastic prepreg tapes can protect the fiber grating sensor from being influenced by local shearing force generated by uneven pressure of the compression roller in the laying process.
The invention discloses an automatic fiber laying process monitoring method, which is realized based on the automatic fiber laying process monitoring device and comprises the following steps:
step one, determining the laying interval of a fiber bragg grating sensor, and determining the diameter of a guide wheel;
determining the position of the prepreg tape to be monitored, adjusting the number of guide wheels and pretightening force adjusting devices, and fixing the guide wheels and the pretightening force adjusting devices after the position is determined;
calculating the position of a point to be monitored of the thermoplastic prepreg tape in advance, and calculating the length of the grating simultaneously to enable the grating sensing part to be positioned at the position of the monitored point;
one end of the fiber bragg grating sensor penetrates through a damper and a directional wheel in the optical fiber pretightening force adjusting mechanism to set pretightening force of the fiber bragg grating sensor on the optical fiber, and the other end of the fiber bragg grating sensor bypasses a guide wheel to be connected into the optical fiber pretightening force adjusting mechanism at the tail end; the fiber grating sensor is arranged between two layers of thermoplastic composite material prepreg tapes so as to ensure that the composite material can be better attached and improve the monitoring precision;
fifthly, connecting the head end of the optical fiber to a fiber grating demodulator, and connecting the fiber grating demodulator to a computer terminal;
opening corresponding monitoring software, checking whether the energy of the installed fiber grating sensor is normal, checking whether the pretightening force meets the requirement, and performing zeroing operation on the pretightening force of the optical fiber;
and step seven, starting the thermoplastic composite material prepreg tape laying device, embedding the fiber grating sensor into the thermoplastic composite material, monitoring stress fields and temperature fields in the filament laying process and the cooling and curing process, and recording regulation data in real time, namely realizing the monitoring of the automatic filament laying process.
Has the advantages that:
the invention discloses a device and a method for monitoring an automatic fiber laying process, which at least have the following beneficial effects:
(1) the embedding of the fiber grating sensor can be realized, the bonding of the fiber grating sensor and the thermoplastic pre-tightening material is realized, the fiber grating sensor can be monitored in real time under the pressure of the compression roller, and the fiber grating sensor is not damaged;
(2) the multi-point monitoring of the plurality of prepreg tapes by one optical fiber can be realized;
(3) the stress field and the temperature field of the thermoplastic composite material in the manufacturing and curing processes can be monitored in real time.
Drawings
FIG. 1 is a schematic structural view of an automatic filament laying process monitoring device according to the present invention;
FIG. 2 is a schematic structural diagram of an optical fiber pre-tension adjustment mechanism;
wherein:
1-fixing a workbench by a thermoplastic composite prepreg tape; 2-an optical fiber pre-tightening force adjusting mechanism; 3-an optical fiber guide mechanism; 4-laying a thermoplastic composite material prepreg tape on a press roller; 5-thermoplastic composite prepreg tape; 6-Fiber Bragg Grating (FBG) sensor; 7-fiber grating demodulator; 8-a computer data acquisition terminal; 2-1-a damper for adjusting the pretightening force of the optical fiber; 2-2-orientation wheels that maintain fiber orientation.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples. The technical problems and the advantages solved by the technical solutions of the present invention are also described, and it should be noted that the described embodiments are only intended to facilitate the understanding of the present invention, and do not have any limiting effect.
As shown in fig. 1, the monitoring device for an automatic fiber laying process disclosed in this embodiment includes a thermoplastic composite prepreg tape fixing workbench 1, an optical fiber pre-tightening force adjusting mechanism 2, an optical fiber guiding mechanism 3, a thermoplastic composite prepreg tape laying compression roller 4, an optical Fiber Bragg Grating (FBG) sensor 6, and an optical fiber grating demodulator 7; and a computer data acquisition terminal 8.
The thermoplastic composite material prepreg tape fixing workbench 1 is used for thermoplastic composite material prepreg.
The optical fiber pre-tightening force adjusting mechanism 2 is shown in fig. 2 and comprises a damper 2-1 for adjusting the pre-tightening force of the optical fiber and an orientation wheel 2-2 for maintaining the fiber direction. According to the position when the thermoplastic composite prepreg tape is actually laid, the optical fiber prepreg tape is fixed in the groove of the thermoplastic composite prepreg tape fixing workbench 1, the damper 2-1 for the optical fiber pretightening force is used for adjusting the pretightening force applied by the optical fiber grating sensor, and the orientation wheel 2-2 for keeping the fiber direction is used for determining the optical fiber direction and preventing the direction deviation generated under the action of factors such as external environment.
And the optical fiber guide mechanism 3 is used for steering the optical fiber sensor, protecting an energy signal of the sensor from being lost in the steering process, and monitoring a plurality of prepreg tapes of one optical fiber.
The thermoplastic composite material prepreg tape laying compression roller 4 is made of silicon rubber and is used for laying and compressing the prepreg tape. The optical fiber is laid between the thermoplastic prepreg tapes to ensure the complete attachment of the fiber grating sensor and the thermoplastic composite prepreg tapes, realize the synchronous deformation with the prepreg tapes and achieve the purpose of measuring strain.
And the optical fiber Bragg grating sensor 6 is used for measuring the changes of the temperature field and the stress field of the prepreg tape in the laying, cooling and curing processes in real time.
The fiber grating demodulation system comprises a fiber grating demodulator 7, a computer data acquisition terminal 8 and corresponding demodulation software, and is used for demodulating an optical signal value generated by fiber grating measurement into an electric signal and a strain value, so that real-time monitoring of the thermoplastic composite material in the manufacturing process is realized.
Scales are arranged at the groove edge of the thermoplastic composite material prepreg tape fixing workbench 1. The optical fiber pretightening force adjusting mechanism 2 and the optical fiber guiding mechanism 3 are movable mechanisms, can slide in the groove and are fixed, the number of the modules can be adjusted according to actual needs and the length of the optical fiber, and the positions of the modules can be adjusted according to the laying position of the thermoplastic composite material and a node to be monitored.
The optical fiber pretightening force adjusting mechanism comprises a damper 2-1 for adjusting the pretightening force of the optical fiber and an orientation wheel 2-2 for keeping the fiber direction. The optical fiber is given a certain pretightening force by a damper 2-1 for adjusting the pretightening force of the optical fiber, so that the optical fiber keeps tension; the fiber direction is kept by the orientation wheel 2-2, so that the optical fibers can be kept parallel under the action of the thermoplastic composite material prepreg tape laying compression roller 4 in the laying process, and the monitoring accuracy is guaranteed. The pre-tightening force of the optical fiber is kept to be 2N, and the laying direction of the optical fiber is kept parallel to the thermoplastic prepreg tape.
The optical fiber guide mechanism 3, the wheel disc and the base support platform of the part are movable, the size of the guide wheel can be changed according to the actual monitoring width of the optical fiber, and flexible monitoring is realized.
The fiber grating sensor is required to be arranged between the two thermoplastic composite material prepreg tapes in the laying process, so that the thermoplastic prepreg tapes protect the fiber grating sensor from the influence of local shearing force generated by uneven pressure of the compression roller in the laying process.
Two rollers of the orientation wheel 2-2 for keeping the fiber direction are made of silicon rubber materials, and the pretightening force of the rollers on the optical fiber is kept between 0N and 15N.
The monitoring method for the automatic fiber laying process disclosed by the embodiment is realized based on the monitoring device for the automatic fiber laying process,
step one, determining the laying interval of the fiber bragg grating sensor, and determining the diameter of a guide wheel of the fiber guide mechanism 3; secondly, determining the position of the prepreg tape to be monitored, adjusting the number of the optical fiber guide mechanism 3 and the optical fiber pretightening force adjusting mechanism 2, and fixing the optical fiber guide mechanism and the optical fiber pretightening force adjusting mechanism after the position is determined; calculating the position of a point to be monitored of the thermoplastic prepreg tape in advance, and calculating the length of the grating simultaneously to enable the grating sensing part to be positioned at the position of the monitored point; one end of the fiber bragg grating sensor passes through a damper 2-1 for adjusting the pretightening force of the optical fiber in the optical fiber pretightening force adjusting mechanism 2 and a damper for keeping the fiber direction and a directional wheel 2-2, the pretightening force of the fiber bragg grating sensor to the optical fiber is set to be 2N, and the other end of the fiber bragg grating sensor bypasses a guide wheel of an optical fiber guide mechanism 3 and is connected into the optical fiber pretightening force adjusting mechanism 2 at the tail end; the fiber grating sensor is arranged between the two layers of thermoplastic composite material prepreg tapes 5 so as to ensure that the composite material can be better attached and improve the monitoring precision; fifthly, the head end of the optical fiber is connected to the fiber grating demodulator 7, and the fiber grating demodulator 7 is connected to the computer data acquisition terminal 8; opening corresponding monitoring software, checking whether the energy of the installed fiber grating sensor is normal, checking whether the pretightening force meets the requirement, and performing zeroing operation on the pretightening force of the optical fiber; and step seven, starting the thermoplastic composite material prepreg tape laying compression roller 4, embedding the fiber grating sensor into the thermoplastic composite material, monitoring the stress field and the temperature field in the filament laying process and the cooling and curing process, recording regulation data in real time, and providing guidance for parameter adjustment.
According to the monitoring method for the automatic filament-laying process of the thermoplastic composite material, the temperature and the stress of the thermoplastic composite material in the manufacturing process are measured through the fiber grating sensor, the residual stress condition existing in the material during solidification can be provided, the stress temperature change condition of the material in the manufacturing process can be provided, various technical parameters (temperature, pressure, laying speed and the like) of the filament-laying machine can be properly adjusted according to the collected data and the molding condition of the thermoplastic composite material, so that a temperature window and a pressure window which are suitable for laying can be conveniently found, the manufacturing power of the thermoplastic composite material is improved, and the molding technology of the composite material is improved.
The above detailed description is intended to illustrate the objects, aspects and advantages of the present invention, and it should be understood that the above detailed description is only exemplary of the present invention and is not intended to limit the scope of the present invention, and any modifications, equivalents, improvements and the like within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. The utility model provides an automatic monitoring devices of shop's silk process which characterized in that: the device comprises a thermoplastic composite prepreg tape fixing workbench, an optical fiber pretightening force adjusting mechanism, a thermoplastic composite prepreg tape laying device, an optical fiber guiding mechanism, an optical fiber Bragg grating sensor and an optical fiber grating demodulating system;
the thermoplastic composite material prepreg tape fixing workbench is used for thermoplastic composite material prepreg;
the optical fiber pretightening force adjusting mechanism comprises a damper and an optical fiber orientation wheel, and can be fixed in the groove of the thermoplastic composite prepreg tape fixing workbench according to the actual laying requirement, the damper is used for adjusting the pretightening force applied by the optical fiber grating sensor, and the orientation wheel is used for determining the direction of an optical fiber and preventing the direction deviation generated under the action of factors such as external environment;
the optical fiber guide mechanism is used for steering the optical fiber sensor, protecting an energy signal of the sensor from being lost in the steering process, and monitoring a plurality of prepreg tapes of one optical fiber;
the laying device for the thermoplastic composite prepreg tape is used for laying and pressing the prepreg tape so as to ensure the complete fit of the fiber grating sensor and the thermoplastic composite prepreg tape, realize synchronous deformation with the prepreg tape and achieve the aim of measuring strain;
the fiber Bragg grating sensor is used for measuring the changes of a temperature field and a stress field of the prepreg tape in the laying, cooling and curing processes in real time;
the fiber grating demodulation system comprises a fiber grating demodulator, a computer terminal and corresponding demodulation software, and is used for demodulating an optical signal value generated by fiber grating measurement into an electric signal and a strain value, so that real-time monitoring of the thermoplastic composite material in the manufacturing process is realized.
2. A device for monitoring an automatic filament laying process according to claim 1, wherein: the groove edge of the groove of the thermoplastic composite prepreg tape fixing workbench is provided with scales, the optical fiber pre-tightening force adjusting mechanism and the optical fiber guiding mechanism are movable mechanisms which can be fixed in the groove in a sliding manner, the number of the modules can be adjusted according to actual needs and the length of optical fibers, and the positions of the modules can be adjusted according to the laying positions of the thermoplastic composite materials and nodes to be monitored.
3. A device for monitoring an automatic filament laying process according to claim 1, wherein: the optical fiber pretightening force adjusting mechanism comprises a damper and a directional wheel, a certain pretightening force is given to the optical fiber through the damper to keep the optical fiber in tension, and the optical fiber can be kept parallel under the action of the laying compression roller in the laying process through the directional wheel to ensure the monitoring accuracy.
4. A device for monitoring an automatic filament laying process according to claim 1, wherein: the wheel disc of the optical fiber guide wheel and the base support table are movable, the size of the guide wheel can be changed according to the actual monitoring width of the optical fiber, and flexible monitoring is achieved.
5. A device for monitoring an automatic filament laying process according to claim 1, wherein: the compression roller of the thermoplastic composite material prepreg tape laying device is made of silicon rubber, the fiber grating sensor is required to be arranged between two thermoplastic composite material prepreg tapes in the laying process, and the direction of the fiber grating sensor is parallel to that of the thermoplastic prepreg tapes, so that the thermoplastic prepreg tapes can protect the fiber grating sensor from being influenced by local shearing force generated by uneven pressure of the compression roller in the laying process.
6. A method for monitoring an automatic filament-laying process, which is carried out by the monitoring device for an automatic filament-laying process according to claim 1, 2, 3, 4 or 5, characterized in that: the method comprises the following steps:
step one, determining the laying interval of a fiber bragg grating sensor, and determining the diameter of a guide wheel;
determining the position of the prepreg tape to be monitored, adjusting the number of guide wheels and pretightening force adjusting devices, and fixing the guide wheels and the pretightening force adjusting devices after the position is determined;
calculating the position of a point to be monitored of the thermoplastic prepreg tape in advance, and calculating the length of the grating simultaneously to enable the grating sensing part to be positioned at the position of the monitored point;
one end of the fiber bragg grating sensor penetrates through a damper and a directional wheel in the optical fiber pretightening force adjusting mechanism to set pretightening force of the fiber bragg grating sensor on the optical fiber, and the other end of the fiber bragg grating sensor bypasses a guide wheel to be connected into the optical fiber pretightening force adjusting mechanism at the tail end; the fiber grating sensor is arranged between two layers of thermoplastic composite material prepreg tapes so as to ensure that the composite material can be better attached and improve the monitoring precision;
fifthly, connecting the head end of the optical fiber to a fiber grating demodulator, and connecting the fiber grating demodulator to a computer terminal;
opening corresponding monitoring software, checking whether the energy of the installed fiber grating sensor is normal, checking whether the pretightening force meets the requirement, and performing zeroing operation on the pretightening force of the optical fiber;
and step seven, starting the thermoplastic composite material prepreg tape laying device, embedding the fiber grating sensor into the thermoplastic composite material, monitoring stress fields and temperature fields in the filament laying process and the cooling and curing process, and recording regulation data in real time, namely realizing the monitoring of the automatic filament laying process.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114659694A (en) * | 2022-04-20 | 2022-06-24 | 浙江理工大学 | Method for detecting surface pressure distribution of elastic compression roller of filament spreading machine |
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| CN114659694A (en) * | 2022-04-20 | 2022-06-24 | 浙江理工大学 | Method for detecting surface pressure distribution of elastic compression roller of filament spreading machine |
| CN114659694B (en) * | 2022-04-20 | 2023-09-15 | 浙江理工大学 | Surface pressure distribution detection method for elastic compression roller of wire laying machine |
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