CN113639655B - Large-scale herringbone gate door shape monitoring system and layout method - Google Patents
Large-scale herringbone gate door shape monitoring system and layout method Download PDFInfo
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- G—PHYSICS
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- 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
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
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- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
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- G—PHYSICS
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- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/46—Processes or apparatus adapted for installing or repairing optical fibres or optical cables
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Abstract
The invention discloses a large-scale herringbone gate door shape monitoring system and a layout method, aiming at the door shape monitoring in the running process of a large-scale herringbone gate, the monitoring and acquisition of the running posture and deformation of the herringbone gate are realized through the layout and implementation of an inclination angle sensor and a fiber bragg grating strain sensor, and the door shape monitoring system and the construction thereof are adopted. The invention aims to solve the problems of high difficulty in monitoring the gate shape of the herringbone gate, poor applicability and lack of scientific guidance in structural failure judgment by means of a technical means, provides a feasible technical scheme for monitoring and constructing the gate shape of the large herringbone gate in the ship lock industry, prevents and solves the running safety risk of the large herringbone gate, and provides a theoretical basis for overhauling the ship lock.
Description
Technical Field
The invention belongs to the technical field of water transportation, relates to the technical field of monitoring and analyzing operation of large hydraulic metal structures, and particularly relates to a large herringbone gate door shape monitoring construction method.
Background
The choke of the ship lock herringbone gate is one of important components of the ship lock and plays an extremely important role in the transshipment of ships. The ship lock is used for retaining water to enable the lock chamber to form a navigation water level required by navigation and controlling a navigation hole of the ship lock, so that the ship can pass through the lock safely. The large-scale metal structural part-lambdoidal door in the navigation building is a key device related to the whole navigation operation, and the service safety and reliability are the key for guaranteeing the smooth water transportation. Once the lambdoidal door has a large fault, the lambdoidal door can cause the navigation break, and the navigation break needs to be stopped for maintenance. The maintenance difficulty is high, the construction period is long, the navigation efficiency of the water area is seriously influenced, and the social and economic losses are huge. Therefore, the safety management and health monitoring can be carried out on the full life cycle of the large-sized lambdoidal door, early warning and alarming are carried out when the running state of the equipment is abnormal, initial faults and accidents are avoided, and the safety and navigation efficiency of the equipment are ensured. However, when the large-sized lambdoidal door works, the large-sized lambdoidal door is subjected to the actions of door weight, door lattice siltation gravity, opening and closing push-pull force, supporting reaction force of top and bottom pivots, friction torque, wind load, water resistance and the like (including water choking resistance and surge resistance), the load and the service environment are complex and changeable, the detection condition is bad, and the detection instrument is not easy to fix and is easy to be damaged by high-speed water flow impact.
The door body vibrates and frequently jumps with small displacement up and down due to the combined action of surge, water-flowing load, operating state of the hoist, huge water pressure on two sides of the underwater door body and the like in the operation process of the herringbone door. When the excitation frequency is close to the natural frequency of the lambdoidal door, the door body resonance is caused, the stress concentration phenomenon is generated, and destructive effects are generated on rigid structural components such as the lambdoidal door body, the AB rod, the back pull rod, the top pivot, the bottom pivot and the like. When the structural damage is accumulated to a certain degree, serious consequences such as fracture of the AB rod/back pull rod, crack occurrence in a deepwater area of the door body and the like are caused. Because the gate has large weight and volume, once the bottom pivot is damaged, the maintenance is time-consuming and labor-consuming, and the shipping is seriously affected; the regular maintenance can cause 'under maintenance' and 'over maintenance' accidents, and meanwhile, the lifting process of the door body can also have a certain influence on the structural performance of the door body, so that the door body deforms, welding seams are pulled apart and other faults are caused. The state maintenance is to realize the pre-judgment and the prediction of the bottom pivot fault on the basis of the gate operation condition monitoring. Meanwhile, the development of computer-aided technology and mechanical signal processing technology greatly promotes the development of on-line monitoring and forecasting of the running condition and faults of the gate. The method can discover hidden trouble faults and the development trend and severity thereof in time, prevent the faults from expanding and accidents from happening, improve the operation reliability of the herringbone gate, provide reliable basis for overhaul of the ship lock, realize early knowledge, early forecast and early diagnosis of the operation faults of the herringbone gate, eliminate the faults in germination, then gradually realize the state overhaul of the ship lock, and prolong the period of the planned overhaul of the ship lock.
Therefore, based on the analysis, the ship lock herringbone gate body needs to be detected and analyzed through technical means, the dissolving risk is prevented, the running state monitoring and the state maintenance of the ship lock herringbone gate are realized, the structural damage is found in time, the safety of the ship lock is evaluated, and therefore the safe and stable running of the ship lock is ensured.
Disclosure of Invention
The invention aims to solve the problems, and provides a large-scale herringbone gate door shape monitoring system and a layout method, which solve the problems of high difficulty in herringbone gate door shape monitoring, poor applicability and lack of scientific guidance in structural failure judgment by technical means, provide a feasible technical scheme for monitoring and constructing the large-scale herringbone gate door shape in the ship lock industry, prevent and solve the running safety risk of the large-scale herringbone gate, and provide a theoretical basis for ship lock overhaul.
The technical scheme of the invention is a large-scale herringbone gate door shape monitoring system and a layout method, and the large-scale herringbone gate door shape monitoring system comprises a signal detection module, a data acquisition module, a data processing module, a data presentation module and a remote supervision module;
the instrument room is arranged in the ship lock opening and closing machine room, the cabinet and the fiber grating demodulation instrument are placed, and the sensing monitoring signals are collected among the instruments and then uploaded to the central control room through a network.
When the door shape monitoring acquisition data calculation processing is carried out, the method further comprises the following steps:
Dividing the herringbone gate into different layers according to the structure form of the herringbone gate, wherein each layer serves as a unit, and the change of wavelength is detected by an inclination sensor of a signal detection module (1) to obtain the structural displacement deformation quantity of the herringbone gate; each grating section is regarded as a calculation unit, the sum of the displacements of the measuring points of each layer of the herringbone gate forms the displacement of the measuring points of the herringbone gate, the original mass point moves from the position M to the position N after the herringbone gate is deformed under the assumption that the initial value of the distance between two points in the herringbone gate is L 0, the moving distance of the mass point in the calculation unit is L 2i, the distance between the points in the herringbone gate section is L 1, and the inclination angle The relation calculation formula is as follows:
（1）
according to the strain relation of the fiber bragg grating, the length change of the optical fiber caused by the deformation of the chevron gate is expressed as:
（2）
In the method, in the process of the invention, Is the strain of a point in the grating,/>，/>Is the rate of change of the grating wavelength, k is a constant related to the fiber grating material and strain;
The displacement of a particle on any layer of the chevron gate is the sum of the displacements of all the computing units below the chevron gate, and is calculated by the following formula:
（3）
Wherein L 2 is the displacement of the measuring point in the monitoring hole, and n is the number of fiber bragg grating calculation units from the bottom to the measuring point in the monitoring hole;
Substituting the formula (2) into the formula (1) to calculate L 2i, and substituting the formula (3) to obtain a displacement formula for calculating the strain of any mass point in the herringbone gate relative to the fiber bragg grating:
（4）
the displacement of the measuring point in the monitoring hole is calculated by the formula (4), wherein, Can be directly measured; l 0 is a default value used at the time of shipment; n is the number of grating points preset at equal distances in the monitoring hole; /(I)Is the strain of the grating point, can pass through/>And calculating, wherein the wavelength is determined by a ground fiber grating optical detection instrument.
The signal detection module consists of a fiber grating strain sensor, an inclination angle sensor, a signal transmitter and a multi-path data conversion device; the fiber bragg grating strain sensor and the inclination angle sensor acquire structural strain parameters of the herringbone gate body, the structural strain parameters are transmitted to corresponding modules through optical fibers through a multipath data conversion device, and the signal transmitter isolates, amplifies, compensates and converts detected gate body strain signals, so that anti-interference capacity and long-distance driving capacity are improved.
The data acquisition module is used for demodulating and acquiring the structural strain parameters of the herringbone gate body, converting the obtained analog quantity into digital quantity and using the digital quantity for subsequent analysis and processing.
The data processing module is a monitoring system core, and is communicated with each interface functional module to perform real-time data processing, refreshing, configuration and logic control functions.
The data presentation module is used for realizing external display and printing of data in the form of chart documents through related equipment.
The remote supervision module is used for realizing remote supervision of the sensors, the monitoring host and the monitoring software equipment on the herringbone gate body equipment.
The layout method of the large-scale herringbone gate door-shaped monitoring system comprises the following steps:
step 1, installation of an inclination angle sensor: adopting a mode of welding the mounting support, firstly welding the mounting support, then mounting the sensor on the support, and finally fastening the inclination sensor through a screw;
Step 2, optical cable protection: each layer of the series optical cable is laid along the top of the lambdoidal door grid; adopting stainless steel C-shaped steel to protect the inner and outer optical cables of the door lattice, adopting a mode of welding a mounting support to fix the C-shaped steel at the top of the door partition, laying the optical cables in a groove, adopting stainless steel binding wires to bind, ensuring that the optical cables are fastened in the C-shaped steel groove, adopting stainless steel pipes for protection of the transmission optical cables, and adopting a mode of welding a mounting support to fix the stainless steel pipes at the back of the inverted V-shaped gate ladder;
Step 3, optical cable networking: the optical cable networking is planned and arranged according to three stages, wherein the first stage is the total junction between the meters and the first layer of cabins, and 48-core optical cables are used; the first layer of the lambdoidal door is arranged from top to bottom, the second stage is the total joint of the first layer of cabins to the joint boxes, and the joint joints are 4 waterproof joint boxes of the inclinometer by using 12-core optical cables; the third stage is to connect the joint to each string of sensors, and use 2-core optical cables;
step 4, the installation process flow of the inclination angle sensor comprises the following steps: the method mainly comprises the steps of detection and screening before departure, installation flow during overhaul and system debugging operation;
Step 5, welding an inclination sensor, wherein the welding length is set to be 200mm according to the size of the inclination sensor and the length of the support, the welding length of the stainless steel C-shaped steel mounting support is set to be 40mm, the welding length of the stainless steel pipe mounting seat is set to be 100mm, and the height of a welding seam is not more than 6mm;
Step 6: the rust removal and corrosion prevention process adopts a double-component zinc-rich primer for priming, so that the adhesive force with a base material is enhanced; meanwhile, the thickness of a paint film is increased by using intermediate paint, so that a good connection effect is achieved, and a better coating effect is achieved; finally, the color of the gate body is reduced by using the finishing paint; the primer, the intermediate coat and the finish coat are matched for use, so that the anti-corrosion effect is better, and the service life is longer; the thickness of the paint film reaches at least 260 micrometers through 1 two times of primer, one time of intermediate paint and two times of finish paint.
Compared with the prior art, the invention has the beneficial effects that:
1. Through the monitoring analysis of large-scale miter gate door body deformation, for large-scale miter gate operation in-process door body deformation and characteristic frequency's calculation provide the reference, to a great extent provides the basis for miter gate structural fatigue life and structural stability analysis, has reduced the safety risk of large-scale miter gate operation.
2. The invention provides a large-scale herringbone gate door shape monitoring system utilizing fiber bragg gratings and an inclination angle sensor and a construction method thereof, wherein detection signals are analyzed, processed and transmitted to obtain deformation of a door body structure.
3. Through the arrangement of the large-scale herringbone gate door shape monitoring system and the design of the construction scheme thereof, a set of more complete large-scale herringbone gate door shape monitoring system and the layout method thereof are developed, the problems of high difficulty in herringbone gate door shape monitoring, poor applicability, lack of scientific guidance in structure failure judgment and the like are solved through the technical means, and a feasible technical scheme is provided for large-scale herringbone gate door shape monitoring and construction in the ship lock industry.
Drawings
The invention is further described below with reference to the drawings and examples.
FIG. 1 is a block diagram of a large-scale chevron gate door form monitoring system of the present invention.
Fig. 2 is a schematic diagram of the gate shape monitoring of the large-scale chevron gate of the present invention.
Fig. 3 is a signal conversion calculation schematic diagram of the large-scale herringbone gate door shape detection sensor.
Fig. 4 is a diagram of a layout and wiring scheme of a large-scale chevron gate door-shaped detection sensor of the present invention.
Fig. 5 is a flow chart of installation of the tilt sensor according to an embodiment of the present invention.
In the figure: the system comprises a signal detection module 1, a data acquisition module 2, a data processing module 3, a data presentation module 4 and a remote supervision module 5.
Detailed Description
Embodiments of the present invention will be further described with reference to the accompanying drawings.
Example 1:
referring to fig. 1-5, a large-scale herringbone gate door shape monitoring system and a construction method thereof are provided for monitoring a large-scale ship gate herringbone gate door body, diagnosing health, overhauling and managing and controlling analysis.
A large-scale herringbone gate door shape monitoring system comprises a signal detection module, a data acquisition module, a data processing module, a data presentation module and a remote supervision module. The cabinet and the fiber grating demodulation instrument are arranged between the instruments in the ship lock opening and closing machine room, sensing monitoring signals are collected between the instruments and uploaded to the central control room through a network.
Further, the signal detection module consists of a fiber grating strain sensor, an inclination angle sensor, a signal transmitter and a multi-path data conversion device, wherein the fiber grating strain sensor and the inclination angle sensor collect parameters of the strain value of the structure of the herringbone gate body, the parameters are sent to the corresponding modules through the multi-path data conversion device by the fiber, and the transmitter isolates, amplifies, compensates and converts weak signals such as detected gate body strain signals, and the like, so that the anti-interference capability and the long-distance driving capability are enhanced.
Furthermore, the data acquisition module is used for demodulating and acquiring the strain parameters of the herringbone gate body, and converting the obtained analog quantity into digital quantity for analysis and processing.
Furthermore, the data processing module is a monitoring system core, and is communicated with each interface functional module to perform real-time data processing, refreshing, configuration and logic control functions.
Furthermore, the data presentation module is used for realizing external display and printing of data in the form of chart documents through related equipment.
Furthermore, the remote supervision module realizes remote supervision of the devices such as the sensor, the monitoring host and the monitoring software deployed on the device of the herringbone gate body.
Example 2:
When the portal monitoring acquisition data calculation processing is carried out, the herringbone gate is divided into different layers according to the herringbone gate structural form, each layer serves as a unit, the change of the wavelength is detected through the inclination sensor, and the deformation quantity of the herringbone gate structural displacement can be obtained. Each grating section is regarded as a calculation unit, and the sum of the displacements of the measuring points of each layer of the herringbone gate forms the displacement of the measuring points of the herringbone gate. Assuming that the initial value of the interval between the grating midpoints is L 0, after the herringbone gate is deformed, the original mass point is moved from the position M to the position N. The moving distance of the particles in the calculation unit is L 2i, the distance between each point in the grating section is L 1, and the inclination angle The relation calculation formula is as follows:
（1）
According to the strain relation of the fiber bragg grating, the length of the optical fiber caused by the deformation of the chevron gate is expressed as:
（2）
In the method, in the process of the invention, Is the strain of a point in the grating,/>，/>Is the rate of change of the grating wavelength, k is a constant related to the fiber grating material and strain.
The displacement of the mass point on any layer of the chevron gate is the sum of the displacements of all the calculation units below the chevron gate, and is calculated by the following formula
（3）
Wherein L 2 is the displacement of the measuring point in the monitoring hole, and n is the number of fiber bragg grating calculation units from the bottom to the measuring point in the monitoring hole.
Substituting the formula (2) into the formula (1) to calculate L 2i, and substituting the formula (3) into the formula (3) to obtain a displacement formula for calculating the strain of any mass point in the herringbone gate relative to the fiber bragg grating
（4）
The displacement of the measuring point in the monitoring hole is calculated by the formula (4), wherein,Can be directly measured; l 0 is a default value used at the time of shipment; n is the number of grating points preset at equal distances in the monitoring hole; /(I)Is the strain of the grating point, can pass through/>And calculating, wherein the wavelength is determined by a ground fiber grating optical detection instrument.
Example 3:
The layout method of the herringbone gate door-shaped monitoring system comprises the following steps:
the preferred embodiments of the present invention will be described in detail below with reference to the attached drawings: it should be understood that the preferred embodiments are presented by way of illustration only and not by way of limitation. A construction method for large-scale lambdoidal door type monitoring is characterized in that: the method comprises the following steps:
As shown in FIG. 4, the X tilt sensors on each chevron door are uniformly distributed on the Y-layer measuring points, and each layer has X/Y measuring points. Y/2 splice boxes are arranged on each lambdoidal door, and each splice box gathers the signal optical cables of X/2 sensors. Each layer is from left to right, the second sensor and the third sensor are placed in the same cabin group string, the fourth sensor and the fifth sensor are placed in the same cabin group string, and the group string optical cable is welded before entering the field; the first sensor group string of the first sensor of the odd-numbered rows next to the first sensor group string requires field fusion of the optical fibers because the sensors cannot pass through the metal conduit. Purple is a 12-core main optical cable for networking, yellow and green are 2-core optical cables for sensor serial connection, the yellow needs to enter a field to implement connection, and the green finishes connection work before entering the field so as to reduce the field construction amount.
Step one, mounting an inclination angle sensor:
All sensors on the door body are mounted by adopting a mode of welding the mounting support, namely, the mounting support is welded firstly, then the sensors are mounted on the support, and finally, the sensors are fastened through screws. The mounting support material is Q345 steel. Because the sensor belongs to a precise device, any small mounting defect can cause testing errors of the sensor or damage of the sensor, and the sensor must be mounted according to a guiding process.
The installation steps are as follows:
step 1.1: sensor support mounting
The sensor bracket is installed and fixed at the measuring point, the bracket can be fastened or welded by using screws, and the underwater inclination sensor bracket is installed at the measuring point in a welding mode. The mounting bracket material is Q345 steel.
Step 1.2: sensor positioning and fastening
The sensor base is provided with a mounting fastening hole and a horizontal adjusting hole, the mounting fastening hole is used for fastening connection of the sensor and the bracket, and the horizontal adjusting hole is used for horizontal positioning adjustment of the sensor. When the sensor is installed and positioned, firstly, the sensor is preliminarily fixed on the bracket by utilizing a screw in the installation fastening hole (a certain adjustment gap is reserved in a notice manner); referring to the micro bubble horizontal beads, adjusting and positioning the sensor by utilizing screws in the horizontal adjusting holes; and finally, screwing the fastening screw.
Step two, optical cable protection:
Each layer of the series optical cable is laid along the top of the lambdoidal door grid; adopt stainless steel C shaped steel to protect the interior, the outer optical cable of door check, adopt the mode of welding the erection support to fix C shaped steel at the door and separate the top promptly, the optical cable lays at the inslot to adopt stainless steel wire tie to carry out the ligature, ensure that the optical cable fastening is at C shaped steel inslot, transmission optical cable adopts DN40 stainless steel pipe to protect, adopts the mode of welding the erection support to fix the stainless steel pipe at artifical cat ladder back promptly.
Step three, optical cable networking:
The optical cable networking is planned according to three stages:
First stage: the total junction between the instruments and the first layer of cabins is 1 by using 48-core optical cables; the Y-shaped door is from last
A first layer position down;
second stage: the total connection of the first layer of cabins is from the position of the tapping splice boxes, and the number of the tapping splice boxes is 4 waterproof splice boxes of the inclinometer by using 12-core optical cables;
Third stage: and (5) connecting the two wires to each sensor string respectively, and using a 2-core optical cable.
Step four, the installation process flow of the inclination angle sensor comprises the following steps:
the installation process flow of the inclination sensor mainly comprises three stages: detection and screening before departure, installation flow during overhaul and system debugging operation.
Welding the inclination angle sensor:
the welding length is set to be 200mm according to the size of the inclination sensor and the length of the support. The welding length of the stainless steel C-shaped steel mounting support is 40mm, the welding length of the stainless steel pipe mounting base is 100mm, and the height of the welding seam is not more than 6mm. The inclination sensor is installed because the support is large, corrosion protection is needed before delivery, and only the welded part is needed to be repaired during corrosion protection.
Firstly, a marking pen is used for drawing a rough outline at the position of a lambdoidal door where a sensor is arranged, namely, the sensor is lofted; secondly, polishing and derusting are carried out in the outline until the metal body is exposed; thirdly, as the steel plate material of the lock body is Q345, all the supports and the components welded on the lock body are consistent with the lock parent metal according to the process requirements, namely the steel plate material is Q345; the main purpose of the welding support is mainly to fix the sensor, the full welding can cause local stress increase, and in order to eliminate the hidden danger of stress concentration, the sensor support is welded by adopting a symmetrical plane welding mode; because the Q345 steel has a large tendency of cold cracking, a low-hydrogen E50 type welding material is selected; the components of the sensor support, the fixed bracket and the like are manually welded by arc welding, and the equipment adopts a small-sized direct current welding machine. After the welding is finished, the welding slag and the welding surface are cleaned, the welding quality is checked in an apparent mode, and the welding of the next sensor can be performed after the welding meets the requirements. Considering that the sensor support cannot be welded in a full-welded mode, the tiny space below the support cannot be subjected to corrosion prevention treatment normally, the gap which cannot be welded is sealed by adopting silica gel, and the defect that the tiny space cannot be subjected to corrosion prevention by adopting paint is overcome.
Step six, derusting and corrosion preventing process:
Because the requirements of the lambdoidal door structure on the corrosion prevention technology are high, in order to prevent corrosion of the welding surfaces of the base of the inclination sensor and the fittings, the corrosion prevention treatment is carried out by adopting the same technology as that of the ship lock. The double-component zinc-rich primer is adopted for priming, so that the adhesive force with a base material is enhanced; meanwhile, the thickness of a paint film is increased by using intermediate paint, so that a good connection effect is achieved, and a better coating effect is achieved; and finally, reducing the color of the gate body by using the finishing paint. The primer, the intermediate coat and the finish coat are matched for use, so that the anti-corrosion effect is better and the service life is longer. Namely, two times of priming paint, one time of intermediate paint and two times of finishing paint, and the thickness of a paint film reaches 260 micrometers.
Claims (6)
1. A large-scale miter gate door shape monitoring system which characterized in that: the system comprises a signal detection module (1), a data acquisition module (2), a data processing module (3), a data presentation module (4) and a remote supervision module (5);
The method comprises the steps that an instrument room is arranged in a lock opening and closing machine room, a cabinet and a fiber bragg grating demodulation instrument are arranged in the lock opening and closing machine room, sensing monitoring signals are collected among the instruments, and then the sensing monitoring signals are uploaded to a central control room through a network;
When the door shape monitoring acquisition data calculation processing is carried out, the method further comprises the following steps:
Dividing the herringbone gate into different layers according to the structure form of the herringbone gate, wherein each layer serves as a unit, and the change of wavelength is detected by an inclination sensor of a signal detection module (1) to obtain the structural displacement deformation quantity of the herringbone gate; each grating section is regarded as a calculation unit, the sum of the displacements of the measuring points of each layer of the herringbone gate forms the displacement of the measuring points of the herringbone gate, the original mass point moves from the position M to the position N after the herringbone gate is deformed under the assumption that the initial value of the distance between two points in the herringbone gate is L 0, the moving distance of the mass point in the calculation unit is L 2i, the distance between the points in the herringbone gate section is L 1, and the inclination angle The relation calculation formula is as follows:
（1）
according to the strain relation of the fiber bragg grating, the length change of the optical fiber caused by the deformation of the chevron gate is expressed as:
（2）
In the method, in the process of the invention, Is the strain of a point in the grating,/>，/>Is the rate of change of the grating wavelength, k is a constant related to the fiber grating material and strain;
The displacement of a particle on any layer of the chevron gate is the sum of the displacements of all the computing units below the chevron gate, and is calculated by the following formula:
（3）
Wherein L 2 is the displacement of the measuring point in the monitoring hole, and n is the number of fiber bragg grating calculation units from the bottom to the measuring point in the monitoring hole;
Substituting the formula (2) into the formula (1) to calculate L 2i, and substituting the formula (3) to obtain a displacement formula for calculating the strain of any mass point in the herringbone gate relative to the fiber bragg grating:
（4）
the displacement of the measuring point in the monitoring hole is calculated by the formula (4), wherein, Can be directly measured; l 0 is a default value used at the time of shipment; n is the number of grating points preset at equal distances in the monitoring hole; /(I)Is the strain of the grating point, can pass through/>Calculating, wherein the wavelength is determined by a ground fiber bragg grating optical detection instrument;
the method for arranging the monitoring system is characterized by comprising the following steps of:
step 1, installation of an inclination angle sensor: adopting a mode of welding the mounting support, firstly welding the mounting support, then mounting the sensor on the support, and finally fastening the inclination sensor through a screw;
Step 2, optical cable protection: each layer of the series optical cable is laid along the top of the lambdoidal door grid; adopting stainless steel C-shaped steel to protect the inner and outer optical cables of the door lattice, adopting a mode of welding a mounting support to fix the C-shaped steel at the top of the door partition, laying the optical cables in a groove, adopting stainless steel binding wires to bind, ensuring that the optical cables are fastened in the C-shaped steel groove, adopting stainless steel pipes for protection of the transmission optical cables, and adopting a mode of welding a mounting support to fix the stainless steel pipes at the back of the inverted V-shaped gate ladder;
Step 3, optical cable networking: the optical cable networking is planned and arranged according to three stages, wherein the first stage is the total junction between the meters and the first layer of cabins, and 48-core optical cables are used; the first layer of the lambdoidal door is arranged from top to bottom, the second stage is the total joint of the first layer of cabins to the joint boxes, and the joint joints are 4 waterproof joint boxes of the inclinometer by using 12-core optical cables; the third stage is to connect the joint to each string of sensors, and use 2-core optical cables;
step 4, the installation process flow of the inclination angle sensor comprises the following steps: the method comprises the steps of detection and screening before departure, installation flow during overhaul and system debugging operation;
Step 5, welding an inclination sensor, wherein the welding length is set to be 200mm according to the size of the inclination sensor and the length of the support, the welding length of the stainless steel C-shaped steel mounting support is set to be 40mm, the welding length of the stainless steel pipe mounting seat is set to be 100mm, and the height of a welding seam is not more than 6mm;
step 6: the rust removal and corrosion prevention process adopts a double-component zinc-rich primer for priming; meanwhile, the thickness of a paint film is increased by using intermediate paint; finally, the color of the gate body is reduced by using the finishing paint; primer, intermediate coat and finish coat are matched for use; the thickness of the paint film reaches at least 260 micrometers through the two-pass primer, the one-pass intermediate paint and the two-pass top paint.
2. The large-scale miter gate door-shaped monitoring system of claim 1, wherein: the signal detection module (1) consists of a fiber grating strain sensor, an inclination angle sensor, a signal transmitter and a multipath data conversion device; the fiber bragg grating strain sensor and the inclination angle sensor acquire structural strain parameters of the herringbone gate body, the structural strain parameters are transmitted to corresponding modules through optical fibers through a multipath data conversion device, and the signal transmitter isolates, amplifies, compensates and converts detected gate body strain signals, so that anti-interference capacity and long-distance driving capacity are improved.
3. The large-scale miter gate door-shaped monitoring system of claim 1, wherein: the data acquisition module (2) is used for demodulating and acquiring the structural strain parameters of the herringbone gate body, and converting the obtained analog quantity into digital quantity for subsequent analysis and processing.
4. The large-scale miter gate door-shaped monitoring system of claim 1, wherein: the data processing module (3) is a monitoring system core, and is communicated with each interface functional module to perform real-time data processing, refreshing, configuration and logic control functions.
5. The large-scale miter gate door-shaped monitoring system of claim 1, wherein: the data presentation module (4) is used for realizing external display and printing of data in the form of chart documents through related equipment.
6. The large-scale miter gate door-shaped monitoring system of claim 1, wherein: and the remote supervision module (5) is used for realizing remote supervision of the sensor, the monitoring host and the monitoring software equipment on the herringbone gate body equipment.
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