Platform for testing optical fiber vibration sensing efficiency of hydraulic structure in complex service environment

Abstract

The invention discloses an optical fiber vibration sensing efficiency test platform for a hydraulic structure in a complex service environment. The optical fiber vibration sensing efficiency test platform comprises a detachable model base module, a complex service environment simulation module, an excitation transmission module, a water circulation module and a sensing control module. The test model is borne by the detachable model base module, and vibration excitation is carried out in a complex service environment. The complex service environment simulation module simulates an underwater environment, sunshine radiation, rainfall and wave impact working conditions. The excitation transmission module provides vibration through a vibration exciter, the water circulation module adjusts water flow and acid radical ion concentration, and the sensing control module collects and controls environmental parameters and vibration data. Vibration response simulation and optical fiber sensing performance testing of a hydraulic structure model under the conditions of earthquakes, waves, illumination and complex water bodies can be achieved, the device has the advantages of being modularized, detachable and convenient to replace, the testing efficiency is improved, and the application effect of distributed optical fiber vibration sensing equipment in actual engineering can be improved.

Description

Technical Field

[0001] The invention relates to the field of optical fiber vibration sensing performance testing of hydraulic structures, and in particular to an optical fiber vibration sensing performance testing platform for hydraulic structures under complex service environments. Background Art

[0002] Thanks to favorable conditions such as the leap in computer performance, the reduction in optical component costs, and the improvement in manufacturing precision, distributed fiber optic vibration sensing technology has developed rapidly in the past decade, especially in the fields of security alarm, trajectory tracking, wave field transmission, etc., realizing full-range, high-dynamic, and wide-frequency target monitoring, and achieving analytical effects that traditional monitoring technologies cannot achieve, promoting and even leading a new round of technological revolution in the above-mentioned fields.

[0003] Fiber optic sensing technology has also received high attention and research in the field of structural health monitoring. Technologies such as fiber grating crack measurement, distributed fiber optic permeability measurement, and distributed fiber optic settlement measurement have been experimentally demonstrated, applied in engineering, and adopted in specifications. However, it is worth noting that with the increase in the scope of fiber optic monitoring, how to ensure the accuracy and effectiveness of measurement information at each point in the spatial scale has become a difficult problem facing engineering and technical personnel. The solution involves many aspects such as fiber optic sensor element packaging and layout, optical signal demodulation and calibration, instrument system packaging and testing, etc., so when structural health monitoring puts forward large-scale and high-precision requirements, if fiber optic sensing technology is to be successfully applied, the relevant research and development work still has a long way to go.

[0004] Distributed fiber optic vibration sensing technology has further increased the measurement function of the time scale, resulting in an exponential increase in the amount of monitoring data, and has put forward higher requirements for technology research and development. At present, optical signal demodulation, optical sensor element design, optical cable laying methods, optical digital signal system research and development, etc. have made great progress, but when it comes to coupling with specific structures, there are insufficient research results on optical signal calibration. Especially when the environment in which the engineering structure is located is complex, there are few reference results on the impact of environmental characteristics on the components of each measurement signal, and the effectiveness of distributed fiber optic vibration sensing is unknown.

[0005] Dams, sluice gates, water towers and other hydraulic structures are representative of this type of engineering structures. When fiber optic sensor elements are laid out in the structure, they will be simultaneously affected by wave loads, water environment corrosion, solar radiation, dry-wet changes, vibration excitation and their own structural properties. The aforementioned optical signal demodulation method, optical sensor element design, optical cable laying method, system error and other factors also bring more interference. Carrying out precise distributed fiber optic vibration sensor performance testing indoors is a necessary prerequisite for the technology to be put into practical application.

[0006] How to simulate as many service environment conditions of hydraulic structures as possible in a limited space is a key issue to improve the economy, feasibility and ease of use of the test. The simulation devices of these environmental conditions should be precisely controlled, the layout should be efficient and reasonable, the operation should be orderly, and they can be freely and flexibly matched with each other. In order to achieve the above goals and better serve the performance test of fiber optic vibration sensors, it is urgent to design a highly modular and integrated test platform. Summary of the invention

[0007] Purpose of the invention: In view of the shortcomings of the prior art, the present invention discloses a fiber optic vibration sensing performance test platform for hydraulic structures under complex service environments. It can quickly arrange and simulate complex service environments according to the characteristics of specific hydraulic structures, and carry out convenient, high-precision, and multi-condition distributed fiber optic vibration test performance evaluation. According to the performance test results of the test platform, the performance of the fiber optic sensing equipment can be further improved, and the accuracy and reliability of actual engineering applications can be improved.

[0008] Technical solution: The present invention discloses a test platform for the optical fiber vibration sensing performance of hydraulic structures under complex service environments, comprising a detachable model base module, a complex service environment simulation module, an excitation transmission module, a water circulation module and a sensing control module, wherein the detachable model base module is arranged in the complex service environment simulation module, the detachable model base module is in transmission connection with the excitation transmission module, and the water circulation module is connected with the complex service environment simulation module; The detachable model base module is fixedly supported with a test model, the test model is provided with a hydraulic structure model vibration response optical fiber sensing element, the excitation transmission module applies necessary vibration excitation to the test model, and the water circulation module and the complex service environment simulation module provide the test model with preset water environment parameters and air environment parameter conditions; The sensing control module includes an air environment parameter sensor and a water environment parameter sensor arranged in the complex service environment simulation module and the water circulation module, and is used to detect the air environment parameters and the water environment parameters in the complex service environment simulation module and the water circulation module; the air environment parameter sensor includes a temperature sensor, a humidity sensor, and an ultraviolet intensity sensor, and the water environment parameter sensor includes a water level sensor and an acid ion concentration sensor; The sensing control module also includes a controller and an optical fiber demodulator. The controller is respectively connected to the control ends of the complex service environment simulation module, the excitation transmission module, and the water circulation module, and is used to perform intelligent control according to air environment parameters, water environment parameters, and excitation transmission requirements; the optical fiber demodulator is connected to the vibration response optical fiber sensing element of the hydraulic structure model.

[0009] Furthermore, the detachable model base module includes a fixed base, a vibration platform, a waterproof rubber cloth, a rolling shaft and a model casting platform; the fixed base is fixed to the ground, and its inner surface is provided with a plurality of rolling shafts at intervals in a direction perpendicular to the excitation transmission direction, the vibration platform is placed on the rolling shaft, and the two sides of the vibration platform are connected to the fixed base by limit springs; the vibration platform and the fixed base are sealed by a waterproof rubber cloth, and a model casting platform is detachably provided on the surface of the vibration platform, and the test model is cast on the model casting platform; the vibration platform is transmission-connected to the excitation transmission module through open grooves on both sides of the fixed base; the fixed base, the vibration platform and the model casting platform are connected to the complex service environment simulation module, so that the test model is located in the complex service environment simulation module.

[0010] Furthermore, a pair of cylindrical protrusions are provided on the surface of the vibration platform, and the model casting platform is provided with grooves corresponding to and matching the cylindrical protrusions; a number of fixing through holes are correspondingly provided on the vibration platform and the model casting platform, and a detachable connection between the vibration platform and the model casting platform is achieved through the fixing through holes and bolts.

[0011] Furthermore, the complex service environment simulation module includes an underwater environment simulation water tank connected to the detachable model base module, and the underwater environment simulation water tank is fixed by a plurality of supporting legs; a water level sensor and an acid radical ion concentration sensor are arranged in the underwater environment simulation water tank; the complex service environment simulation module also includes a sunlight radiation environment simulation component, a rainfall environment simulation component, and a wave slamming environment simulation component arranged above the underwater environment simulation water tank; The underwater environment simulation water tank is used to simulate the properties of wading structures underwater and in the air-water transition zone, and is connected to the water circulation module to control the water level and the acid ion concentration of the water body. The sunlight radiation environment simulation component is used to simulate real sunlight conditions, including the influence of temperature, humidity, and ultraviolet rays. The rainfall environment simulation component is used to simulate the properties of hydraulic structures under rainfall of different intensities. The wave slamming environment simulation component is used to simulate the influence of waves on hydraulic structures.

[0012] Furthermore, a plurality of guide rail pillars are arranged around the underwater environment simulation water tank, guide rails are arranged on the guide rail pillars parallel to the two sides of the underwater environment simulation water tank, a composite functional frame is slidably connected between a pair of the guide rails, and the composite functional frame is connected to a sunlight radiation environment simulation component and a rainfall environment simulation component through a composite functional frame transverse groove; the sunlight radiation environment simulation component includes an incandescent lamp and an ultraviolet lamp, and the rainfall environment simulation component includes a rainfall water pipe connected to the transverse groove of the composite functional frame, and the rainfall water pipe is connected to the water circulation module through a compression pump.

[0013] Furthermore, the wave slamming environment simulation component includes a top fixed hanging platform slidably connected to the guide rail, a wave-making board is arranged under the top fixed hanging platform, the wave-making board is a hollow structure with a wide top and a narrow bottom, and the top fixed hanging platform is also transmission-connected to the excitation transmission module.

[0014] Furthermore, the excitation transmission module includes an exciter, an exciter platform and a vibration conduction frame, the exciter platform is placed on the guide rail, the exciter is arranged on the exciter platform, the exciter is connected to the vibration conduction frame through an excitation rod, and the vibration conduction frame is connected to the vibration platform through a vibration platform wing plate; when the exciter is working, the exciter platform is fixed to the guide rail by a limit clamp.

[0015] Furthermore, the exciter is also connected to a wave slamming environment simulation component via an excitation rod.

[0016] Furthermore, the vibration conduction frame is a special-shaped structure, including a horizontal vibration conduction component and a vertical vibration conduction component along the guide rail direction. The horizontal vibration conduction component is inserted through the guide rail on one side, and its top end is provided with densely arranged slots, in which a vibration transmission displacement component is inserted, and the other end of the vibration transmission displacement component is fixedly connected to the end of the exciting rod, the horizontal vibration conduction component is fixedly connected to the vertical vibration conduction component, and the two sides of the vertical vibration conduction component are fixedly connected to the vibration platform wing plate.

[0017] Furthermore, the water circulation module includes a clean water tank, an acid ion-containing water tank and a connecting pipe. The clean water tank and the acid ion-containing water tank are placed side by side on one side of the complex service environment simulation module. The clean water tank is provided with a water inlet, and a polypropylene membrane is arranged between it and the acid ion-containing water tank. The clean water tank and the acid ion-containing water tank are respectively led out by a connecting pipe, arranged along the underwater environment simulation water tank, and then connected to the complex service environment simulation module.

[0018] Beneficial Effects

[0019] 1. The present invention takes into account the diversity and expansibility of test conditions through modular design. The detachable model base module is characterized by precise positioning and rapid disassembly, which greatly improves the test efficiency and supports the flexible replacement of different test object models. The complex service environment simulation module and the water circulation module realize the full-scale simulation of the service environment, covering various working conditions such as underwater environment, wave impact, solar radiation and rainfall intensity. The precise control function of the water circulation module can realize the precise control of the acid ion concentration and water level of the water body, and provide real and dynamic test conditions for the study of the optical fiber vibration sensing performance of hydraulic structures under complex environments. In addition, through the computer precise adjustment function of the sensor control module, the platform can dynamically adjust the light intensity, rainfall conditions and water flow parameters to meet the test requirements of complex environmental variables acting simultaneously. The design of the excitation transmission module has both high-precision excitation and multi-functional simulation capabilities. Through the combined application of special-shaped vibration conduction components and guide rail supports, the module can flexibly simulate actual working conditions under seismic excitation, wave action or the combined action of the two. The modular combination ensures the diversity of excitation modes and supports the rapid adjustment of the position of the exciter platform, realizing a comprehensive analysis of the vibration response of hydraulic structures under different working conditions. With its precise testing capabilities, flexible environmental simulation, diverse excitation modes and efficient model replacement process, the platform provides strong technical support for the research on the effectiveness of optical fiber vibration sensing of hydraulic structures in complex service environments, and has significant application value and promotion potential.

[0020] 2. The rolling axis between the fixed base and the vibration platform of the detachable model base module designed by the present invention can make the rolling axis roll without lateral movement or rotation. The rolling axis can reduce the friction between the fixed base and the vibration platform, and the vibration platform does not undergo a large displacement. The vibration platform is connected to the fixed base on both sides by limit springs, which can buffer the excitation vibration of the vibration platform. The detachable connection between the vibration platform and the model casting platform can facilitate the replacement of the test model on the vibration platform. When replacing, it is only necessary to remove the model casting platform and the test model on the model casting platform. When replacing the test model, a new model casting platform can be replaced.

[0021] 3. The cylindrical protrusion designed in the present invention plays a limiting role between the vibration platform and the model casting platform. When the vibration platform and the model casting platform are connected and fixed, the cylindrical protrusion is used for limiting. After the model casting platform is installed in place, the vibration platform and the model casting platform can be relatively fixed by bolts.

[0022] 4. The present invention sets a sunlight radiation environment simulation component, a rainfall environment simulation component, and a wave slamming environment simulation component in an underwater environment simulation tank, which can simulate sunlight environment, rainfall environment, and wave environment, and form a variety of different environments to test the vibration response optical fiber sensing element of the hydraulic structure model. It can simulate comprehensive air environment parameters and water environment parameters, and the test is more comprehensive.

[0023] 5. In order to achieve the authenticity of the simulation effect, the present invention directly sets the sunlight radiation environment simulation component, the rainfall environment simulation component, and the wave impact environment simulation component on a guide rail. By sliding left and right on the guide rail, it can realize multi-angle and multi-position air parameter adjustment, multi-position rainfall environment adjustment and multi-position wave environment simulation.

[0024] 6. The vibrator designed in the present invention can transmit the lateral excitation to the vibration platform through a vibration transmission frame. In addition, the lateral excitation can also be transmitted to the wave slamming environment simulation component. By transmitting the lateral excitation to the wave-making board, wave-making excitation is achieved. The optical fiber vibration sensing data at this time is collected and analyzed, and the optical fiber vibration sensing performance of the hydraulic structure under the action of wave slamming can be studied.

[0025] 7. The surface of the horizontal vibration conduction component designed in the present invention is provided with multiple notches, which can conveniently adjust the position of the vibration transmission displacement component, and then adjust the position of the excitation transmission module and the wave-making board, so as to meet the fiber optic vibration sensing efficiency under multi-angle and multi-position wave-making and excitation.

[0026] 8. The water circulation module designed by the present invention is provided with a polypropylene membrane between two water tanks. Clean water is injected from the clean water tank, and the clean water can pass back and forth through the membrane to keep water in the water tanks on both sides. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is the overall structure diagram of the optical fiber vibration sensing performance test platform of the present invention; Figure 2 It is a schematic diagram of the overall structure of the detachable model base module; Figure 3 Detailed structure of the detachable model base module Figure 1 ; Figure 4 Detailed structure of the detachable model base module Figure 2 ; Figure 5 This is a schematic diagram of a water tank for underwater environment simulation; Figure 6 This is a schematic diagram of adjustable height support feet; Figure 7 It is a schematic diagram of the overall structure of the excitation transmission module and the complex service environment simulation module; Figure 8 It is a detailed structural diagram of the excitation transmission module; Fig. 9 It is a schematic diagram of the structure of the sunshine and rainfall environment simulation components and the water circulation module; Fig.10 Schematic diagram of the guide rail structure.

[0028] Among them: 1-detachable model base module; 101-fixed base; 102-vibration platform wing plate; 103-vibration platform; 104-long cylindrical groove; 105-rolling shaft; 106-vibration platform screw hole; 107-limit spring; 108-cylindrical protrusion; 109-model casting platform screw hole; 110-model casting platform; 111-waterproof rubber cloth; 2-complex service environment simulation module, 201-underwater environment simulation water tank; 202-incandescent lamp; 203-rainwater pipe; 204-top fixed hanging platform; 205-wave-making board; 206-waterproof bottom plate; 207-glass baffle; 208-support rod; 209-ultraviolet lamp; 210-composite function frame cross groove; 211-composite function frame; 213-support foot; 214-hexagonal nut; 215-threaded adjustment rod; 3-excitation transmission module, 301-vibrator; 302-vibrator platform; 303-guide rail; 304-vibration transmission frame ; 305-guide rail support; 306-excitation rod; 307-limit clamp; 308-limit clamp bolt; 309-first connecting rod, 310-second connecting rod, 311-strip jack, 312-horizontal vibration conduction component; 313-vertical vibration conduction component; 4-water circulation module, 401-purified water tank; 402-acid ion water tank; 403-connecting pipe; 404-polypropylene membrane; 405-water inlet. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below in conjunction with the accompanying drawings: The present invention discloses an optical fiber vibration sensing performance testing platform for hydraulic structures under complex service environments, comprising a detachable model base module 1, a complex service environment simulation module 2, an excitation transmission module 3, a water circulation module 4, and a sensing control module. The detachable model base module 1 is used to carry a test model and is placed in the complex service environment simulation module 2. Necessary vibration excitation is applied to the test model through the excitation transmission module 3. The water circulation module 4 is connected to the complex service environment simulation module 2 to provide water flow and environmental conditions that can be adjusted by the sensing control module.

[0030] In this embodiment, the sensor control module includes an air environment parameter sensor and a water environment parameter sensor arranged in the complex service environment simulation module 2 and the water circulation module 3, which are used to detect the air environment parameters and water environment parameters in the complex service environment simulation module 2 and the water circulation module 4. The air environment parameter sensor includes a temperature sensor, a humidity sensor, and an ultraviolet intensity sensor. The water environment parameter sensor includes a water level sensor and an acid radical ion concentration sensor. The water level sensor and the acid radical ion concentration sensor are arranged in the water circulation module 4 to detect the water level and the acid radical ion concentration. The temperature sensor, the humidity sensor, the ultraviolet intensity sensor, the water level sensor, and the acid radical ion concentration sensor are arranged in the complex service environment simulation module 2 to detect the temperature, humidity, ultraviolet intensity, water level, and acid radical ion concentration.

[0031] The sensing control module also includes a controller and an optical fiber demodulator. The controller is respectively connected to the control ends of the complex service environment simulation module 2, the excitation transmission module 3, and the water circulation module 4, and is used to perform intelligent control according to air environment parameters, water environment parameters, and excitation transmission requirements. The optical fiber demodulator is connected to the vibration response optical fiber sensing element of the hydraulic structure model.

[0032] Removable model base module Figure 2 , including a fixed base 101, a vibration platform 103, a limit spring 107, a waterproof rubber cloth 111, a rolling shaft 105, and a model casting platform 110. The fixed base 101 is fixed to a solid and flat ground at the beginning of the platform installation, and a plurality of rolling shafts 105 are arranged on its inner surface in a rolling manner in a direction perpendicular to the excitation transmission direction (a long cylindrical groove 104 is provided at the bottom of the inner side of the fixed base 101 to embed the rolling shaft 105, so that the rolling shaft 105 does not move horizontally or rotate while rolling), and the vibration platform 103 is placed on the rolling shaft 105. The vibration platform 103 and the fixed base 101 are spaced apart in the vertical direction through a plurality of rolling shafts 105 to reduce the friction resistance of the vibration platform 103 when it moves forward and backward. Limit springs 107 are placed between the two sides of the vibration platform 103 and the fixed base 101 to prevent the vibration platform 103 from hitting the fixed base 101 and to simulate the dynamic characteristics of the structural foundation at the same time. In this embodiment, four small holes are opened on the inner front and rear walls of the fixed base 101 and the front and rear walls of the vibration platform 103 to embed the limit springs 107 .

[0033] The vibration platform 103 and the fixed base 101 are sealed by a waterproof rubber cloth 111 to prevent water from invading the inside of the base module and affecting the excitation efficiency. The surface of the vibration platform 103 is detachably provided with a model casting platform 110, and the test model is cast on the model casting platform 110; the vibration platform 103 is connected to the excitation transmission module 3 through the opening grooves on both sides of the fixed base 101. The fixed base 101, the vibration platform 103 and the model casting platform 110 are connected to the complex service environment simulation module 2, so that the test model is located in the complex service environment simulation module 2.

[0034] In order to realize that the model casting platform 110 is detachably provided on the surface of the vibration platform 103, a plurality of fixed through holes are correspondingly provided on the vibration platform 103 and the model casting platform 110, and the detachable connection between the vibration platform 103 and the model casting platform 110 is realized through the fixed through holes and bolts. That is, a plurality of vibration platform screw holes 106 are provided on the surface of the vibration platform 103, and a plurality of model casting platform screw holes 109 are provided through the surface of the model casting platform 110. The vibration platform screw holes 106 correspond to the model casting platform screw holes 109 one by one. After the model casting platform 110 is placed on the surface of the vibration platform 103, the two are directly fixed by bolts. In order to make the vibration platform screw holes 106 correspond to the model casting platform screw holes 109 one by one, a pair of cylindrical protrusions 108 are also provided on the surface of the vibration platform 103, and the model casting platform 110 is provided with grooves corresponding to the cylindrical protrusions 108. The cylindrical protrusion 108 is used to limit the vibration platform 103 and the model casting platform 110 so as to be arranged correspondingly.

[0035] The complex service environment simulation module 2 includes an underwater environment simulation tank 201, a sunlight radiation environment simulation component, a rainfall environment simulation component, and a wave slamming environment simulation component. The underwater environment simulation tank 201 is used to simulate the properties of wading structures underwater and in the air-water transition zone. It is connected to the water circulation module 3 to control the water level and the acid ion concentration of the water body. The sunlight radiation environment simulation component is used to simulate real sunlight conditions, including the influence of heat, dryness, and ultraviolet rays. The rainfall environment simulation component is used to simulate the properties of hydraulic structures under rainfall of different intensities. The wave slamming environment simulation component is used to simulate the influence of waves on hydraulic structures.

[0036] A plurality of guide rail pillars 305 are arranged around the underwater environment simulation water tank 201, and guide rails 303 are arranged on the guide rail pillars 305 parallel to the two sides of the underwater environment simulation water tank 201, and a composite functional frame 211 is slidably connected between a pair of guide rails 303, and the composite functional frame 211 is connected to a sunlight radiation environment simulation component and a rainfall environment simulation component through a composite functional frame transverse groove 210; the sunlight radiation environment simulation component includes an incandescent lamp 202 and an ultraviolet lamp 208, and the rainfall environment simulation component includes a rainfall water pipe 203 connected to the composite functional frame transverse groove 210, and the rainfall water pipe 203 is connected to the water circulation module 4 through a compression pump.

[0037] In this embodiment, the composite functional frame 211 is arranged on the guide rail 303 and can slide on the guide rail 303. The composite functional frame 211 can be controlled to slide on the guide rail 303 by a first stepper motor (not shown in the figure). The composite functional frame 211 can be connected to the first stepper motor through a first lead screw, and the first stepper motor drives the composite functional frame 211 to slide on the guide rail 303. The control end of the first stepper motor is connected to the controller of the sensor control module.

[0038] In this embodiment, the incandescent lamp 202 and the ultraviolet lamp 208 of the sunlight radiation environment simulation component are directly fixed on the composite function frame transverse groove 210 through the lamp holder, and move with the composite function frame 211. The rainwater pipe 203 is connected to the connecting pipe 403 and is connected through a compression pump (not shown in the figure). The compression pump, the incandescent lamp 202 and the ultraviolet lamp 208 are all connected to the controller of the sensor control module, and the operation of the compression pump, the incandescent lamp 202 and the ultraviolet lamp 208 is controlled by the controller.

[0039] The wave slamming environment simulation component includes a wave-making board 205 slidably connected to the guide rail 303 , and a top fixed hanging platform 204 is arranged on the top of the wave-making board 205 . The wave-making board 205 is a hollow structure with a wide top and a narrow bottom. The top fixed hanging platform 204 is also connected to the excitation transmission module 3 in transmission.

[0040] In order to facilitate the replacement of the test model, the underwater environment simulation tank 201 is designed to be detachable, and is composed of a glass baffle 207, a support rod 208, a support leg 213, and a waterproof bottom plate 206. The glass baffle 207 and the support rod 208 are waterproofly bonded using epoxy resin glue. The middle glass baffle 207 can be disassembled using an epoxy glue solvent to facilitate the replacement of the model casting platform 110. The waterproof bottom plate 206 is located on the surface of the fixed base 101, and is waterproofly bonded to the surface of the fixed base 101 using epoxy resin glue, so that the fixed base 101 and the test model on its surface are completely located in the underwater environment simulation tank 201.

[0041] In addition, in order to ensure that the bottom of the underwater environment simulation tank 201 is level, a support foot 213 is provided on the lower surface of the underwater environment simulation tank 201. The support foot 213 is composed of a cast iron round base, a threaded adjustment rod 215, and a hexagonal nut 214. The height of the support foot 213 is adjusted by the threaded adjustment rod 215. When replacing the test model, the glass water retaining plate 207 in the middle of the underwater environment simulation tank 201 of the complex service environment simulation module 2 can be removed, and the model casting platform 110 can be disassembled and replaced to increase the test efficiency.

[0042] The excitation transmission module 3 includes a vibrator 301, a vibrator platform 302, a guide rail 303, a vibration transmission frame 304, and a guide rail support 305. The guide rail support 305 is arranged in a surrounding shape outside the complex service environment simulation module 2. The guide rails 303 on both sides are respectively fixed to the top of the guide rail support 305. The vibrator platform 302 is placed on the guide rails 303 and fixed to the vibrator 301 by bolts. The exciting force provided by the vibrator 301 is respectively transmitted to the vibration platform 103 of the detachable model base module 1 and the wave-making board 205 of the wave slamming environment simulation component of the complex service environment simulation module 2 through the vibration transmission frame 304. In this embodiment, the vibrator platform 302 spans across the two guide rails 303 and can slide on the guide rails 303. A semicircular depression is set in the middle to place the vibrator 301. The back plate of the vibrator 301 is fixed to the vibrator platform 302 by screws.

[0043] The exciter 301 is connected to a vibration transmission frame 304 through an excitation rod 306, and the vibration transmission frame 304 is connected to the vibration platform 103 through the vibration platform wing plate 102. When the exciter 301 is working, the exciter platform 302 is fixed to the guide rail 303 by a limit clamp 307, and the limit frame 307 is relatively fixed by a limit frame bolt 308. In this embodiment, grooves are opened on both sides of the fixed base 101, and the vibration platform 103 extends out of the vibration platform wing plate 102 through the grooves to connect with the vibration transmission module 3.

[0044] The exciter 301 is also connected to a wave slamming environment simulation component through an excitation rod 306. In this embodiment, a strip-shaped socket and a fixing bolt are provided on the top fixed hanging platform 204. The end of the excitation rod 306 is connected to a first connecting rod 309, and the end of the first connecting rod 309 is connected to a second connecting rod 310. The first connecting rod 309 can be inserted into the strip-shaped socket 311, and the first connecting rod 309 is fixedly connected to the top fixed hanging platform 204 through a fixing bolt on one side. The second connecting rod 310 extends to the vibration conduction frame 304 through the excitation rod 306 and the first connecting rod 309.

[0045] The vibration conduction frame 304 is a special-shaped structure, including a horizontal vibration conduction component 312 along the guide rail 303 and a vertical vibration conduction component 313 perpendicular to the guide rail 303. The vertical vibration conduction component 313 and the horizontal vibration conduction component 312 are both inserted by one side of the guide rail 303. The top of the horizontal vibration conduction component 312 is provided with densely arranged slots, and one end of the second connecting rod 310 is inserted into the slot. The other end of the second connecting rod 310 is fixedly connected to the end of the exciting rod 306. The second connecting rod 310 allows the exciter platform 302 to change its position along the guide rail 303. The horizontal vibration conduction component 312 is fixedly connected to the vertical vibration conduction component 313, and the two sides of the vertical vibration conduction component 313 are fixedly connected to the vibration platform wing plate 102.

[0046] The water circulation module 4 includes a clean water tank 401, an acid ion water tank 402, and a connecting pipe 403. The clean water tank 401 and the acid ion water tank 402 are placed side by side on one side of the complex service environment simulation module 2. The clean water tank 401 is provided with a water inlet 405, and a polypropylene membrane 404 is provided between the clean water tank 401 and the acid ion water tank 402, so that only clean water can pass through the connecting port. The clean water tank 401 and the acid ion water tank 402 are respectively led out by connecting pipes 403, which are arranged along the underwater environment simulation water tank 201 and connected to the complex service environment simulation module 2.

[0047] In this embodiment, the guide rail 303 is designed to be a multifunctional guide rail. Figure 8 , there are three guide rail paths, the cross section of which is an I-shaped structure, a vibration conduction frame 304 is sleeved on the sliding path at the upper end of the I-shaped structure, and a composite function frame 211, a wave-making board 205, and an exciter platform 302 are respectively arranged on the sliding paths on both sides of the lower end of the I-shaped structure, and the wave-making board 205 and the exciter platform 302 are located on the sliding path on the same side, so that the composite function frame 211, the vibration conduction frame 304, the wave-making board 205 and the exciter platform 302 do not affect each other when sliding on the guide rail 303. A protrusion-shaped structure is arranged on the guide rail 303 of the sliding paths on both sides of the lower end of the I-shaped structure to limit the movement of the vibration conduction frame 304, the composite function frame 211, the wave-making board 205 and the exciter platform 302 along the guide rail 303.

[0048] Meanwhile, the second screw rod and the second stepping motor can be designed with reference to the driving design of the composite functional frame 211 to drive the wave-making board 205 to slide on the guide rail 303 . The second stepping motor is connected to the controller, and the controller controls the operation of the second stepping motor.

[0049] The test platform test process is as follows: Step 1: Find a test site with appropriate space, make sure the site is flat and the ground is stable, make a hole in the ground, fix the fixed base 101 through the bottom screw hole, put the rolling shaft 105 in the fixed base 101, put the vibration platform 103 and install the vibration platform wing plate 102, put the limit spring 107, and use the waterproof rubber cloth 111 to seal the inside of the fixed base 101, cast and make the model on the model casting platform 110, and at the same time arrange the hydraulic structure model vibration response optical fiber sensor element (not shown in the figure, conventionally set inside the test model), move the model casting platform 110 along the top of the vibration platform 103, and connect and fix the model casting platform 110 to the vibration platform 103.

[0050] Step 2: Arrange the underwater environment simulation water tank 201 along the installed detachable model base module 1, first determine the position of the support rod 208, then insert the glass baffle 207 and the waterproof bottom plate 206, adjust the position of the support rod 208 and the height of the supporting feet 213 to make the glass baffle 207, the waterproof bottom plate 206, and the support rod 208 in close contact, use epoxy resin glue for sealing and bonding, and check whether there is any leakage at the bottom of the underwater environment simulation water tank 201 through water.

[0051] Step 3: Determine the position of the guide rail support 305 and fix it, install the guide rail 303, and apply engine oil on the surface of the guide rail 303 to ensure smooth movement of various components.

[0052] Step 4: Insert the vertical vibration conducting component 313 and the horizontal vibration conducting component 312 in sequence and fix the two together, fix both sides of the vertical vibration conducting component 313 to the vibration platform wing plate 102, insert the wave-making board 205 on the guide rail 303, continue to insert the exciter platform 302, install and fix the exciter 301, fix the top fixed hanging platform 204 and the first connecting rod 309 at the top of the excitation rod 306 according to the position of the wave-making board 205 set in the test, and use the limit clamp 307 to fix the exciter platform 302 on the guide rail 303.

[0053] Step 5: When the first connecting rod 309 and the second connecting rod 310 are not used to connect the horizontal vibration transmission component 312 and the vertical vibration transmission component 313, the excitation provided by the exciter 301 is not transmitted to the vibration platform 103. At this time, the exciter 301 only performs wave-making excitation. The optical fiber vibration sensing data at this time is collected and analyzed to study the optical fiber vibration sensing performance of the hydraulic structure under the action of wave impact.

[0054] Step 6: Loosen the fixing bolts of the first connecting rod 309 and the top fixed hanger 204, and use the second connecting rod 310 to connect the horizontal vibration transmission member 312. At this time, the excitation provided by the exciter 301 can be transmitted to the vibration platform 103, but no wave-making excitation occurs. The optical fiber vibration sensing data at this time is collected and analyzed to study the optical fiber vibration sensing performance of hydraulic structures under earthquakes. The position of the mobile exciter platform 302 can simulate the vibration characteristics of hydraulic structure water retaining buildings at different positions, and conduct relevant optical fiber vibration sensing performance tests.

[0055] Step 7: Simultaneously fix the fixing bolts of the top fixing bracket 204 and the first connecting rod 309, the second connecting rod 310 and the horizontal vibration transmission member 312, so that the excitation provided by the exciter 301 can be transmitted to the vibration platform 103 and the wave-making board 205 at the same time, which can simulate the combined effect of earthquake excitation on the reservoir water-dam body, and conduct a research test on the optical fiber vibration sensing performance of the hydraulic structure under this working condition.

[0056] Step 8: Based on the temperature sensor, humidity sensor, and ultraviolet intensity sensor, the various environmental condition parameters of the model surface are sensed in real time. According to the computer's built-in environmental setting requirements, instructions are issued to adjust the intensity and position of the incandescent lamp 202 and the ultraviolet lamp 208 through the controller to conduct research experiments on the optical fiber vibration sensing performance of hydraulic structures under complex lighting conditions.

[0057] Step 9: Based on the various water condition parameters sensed in real time by the acid ion concentration sensor and water level sensor built into the underwater environment simulation tank 201, according to the computer's built-in environment setting requirements, a command is issued to adjust the operation of the compression pump through the controller to conduct a research test on the optical fiber vibration sensing performance of hydraulic structures under complex water conditions.

[0058] Step 10: Based on the acid radical concentration sensor built into the rainwater pipe 203, according to the computer built-in environment setting requirements, a command is issued to adjust the operation of the compression pump through the controller to conduct a research test on the optical fiber vibration sensing performance of hydraulic structures under different acid radical ion concentrations.

[0059] Step 11: Remove the complex service environment simulation module 2, the excitation transmission module 3 and the glass baffle 207 in the middle of the underwater environment simulation tank 201, disassemble and replace the model casting platform 110 and the test model, and repeat steps 5 to 10 to achieve the purpose of quickly replacing the test model to test the optical fiber vibration sensing performance of the hydraulic structure under a complex service environment.

[0060] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent transformation or modification made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A test platform for the optical fiber vibration sensing performance of hydraulic structures under complex service environments, characterized in that: The invention comprises a detachable model base module (1), a complex service environment simulation module (2), an excitation transmission module (3), a water circulation module (4) and a sensor control module, wherein the detachable model base module (1) is arranged in the complex service environment simulation module (2), the detachable model base module (1) is in transmission connection with the excitation transmission module (3), and the water circulation module (4) is connected with the complex service environment simulation module (2); The detachable model base module (1) is fixedly supported with a test model, the test model is provided with a hydraulic structure model vibration response optical fiber sensing element, necessary vibration excitation is applied to the test model through the excitation transmission module (3), and the water circulation module (4) and the complex service environment simulation module (2) provide the test model with preset water environment parameter and air environment parameter conditions; The sensing control module comprises an air environment parameter sensor and a water environment parameter sensor which are arranged in the complex service environment simulation module (2) and the water circulation module (3), and are used to detect the air environment parameters and the water environment parameters in the complex service environment simulation module (2) and the water circulation module (4); the air environment parameter sensor comprises a temperature sensor, a humidity sensor, and an ultraviolet intensity sensor; and the water environment parameter sensor comprises a water level sensor and an acid ion concentration sensor; The sensing control module also includes a controller and an optical fiber demodulator. The controller is respectively connected to the control ends of the complex service environment simulation module (2), the excitation transmission module (3), and the water circulation module (4), and is used to perform intelligent control according to air environment parameters, water environment parameters, and excitation transmission requirements; the optical fiber demodulator is connected to the vibration response optical fiber sensing element of the hydraulic structure model.

2. According to the test platform for optical fiber vibration sensing performance of hydraulic structures under complex service environment in claim 1, it is characterized in that: The detachable model base module (1) comprises a fixed base (101), a vibration platform (103), a waterproof rubber cloth (111), a rolling shaft (105) and a model casting platform (110); the fixed base (101) is fixed to the ground, and a plurality of rolling shafts (105) are arranged on its inner surface in a rolling manner in a direction perpendicular to the excitation transmission direction; the vibration platform (103) is placed on the rolling shaft (105), and both sides of the vibration platform (103) are connected to the fixed base (101) via limit springs (107); the vibration platform (103) ) is sealed with a waterproof rubber cloth (111) between the vibration platform (103) and the fixed base (101); a model casting platform (110) is detachably provided on the surface of the vibration platform (103), and the test model is cast on the model casting platform (110); the vibration platform (103) is transmission-connected to the excitation transmission module through opening grooves on both sides of the fixed base (101); the fixed base (101), the vibration platform (103) and the model casting platform (110) are connected to the complex service environment simulation module, so that the test model is located in the complex service environment simulation module.

3. According to claim 2, a test platform for optical fiber vibration sensing performance of hydraulic structures under complex service environments, characterized in that: The surface of the vibration platform (103) is also provided with a pair of cylindrical protrusions (108), and the model casting platform (110) is provided with grooves corresponding to and matching the cylindrical protrusions (108); a plurality of fixing through holes are correspondingly provided on the vibration platform (103) and the model casting platform (110), and a detachable connection between the vibration platform (103) and the model casting platform (110) is achieved through the fixing through holes and bolts.

4. According to the test platform for optical fiber vibration sensing performance of hydraulic structures under complex service environment in claim 1, it is characterized in that: The complex service environment simulation module (2) comprises an underwater environment simulation water tank (201) connected to the detachable model base module, and the underwater environment simulation water tank (201) is fixed by a plurality of supporting legs; a water level sensor and an acid radical ion concentration sensor are arranged in the underwater environment simulation water tank (201); the complex service environment simulation module (2) further comprises a sunlight radiation environment simulation component, a rainfall environment simulation component, and a wave slamming environment simulation component arranged above the underwater environment simulation water tank (201); The underwater environment simulation water tank (201) is used to simulate the properties of underwater and air-water transition zone wading structures, and is connected to the water circulation module to control the water level and the acid ion concentration of the water body. The sunlight radiation environment simulation component is used to simulate real sunlight conditions, including the influence of temperature, humidity and ultraviolet rays. The rainfall environment simulation component is used to simulate the performance of hydraulic structures under rainfall of different intensities. The wave slamming environment simulation component is used to simulate the influence of waves on hydraulic structures.

5. According to claim 4, a test platform for optical fiber vibration sensing performance of hydraulic structures under complex service environments, characterized in that: A plurality of guide rail pillars (305) are arranged around the underwater environment simulation water tank (201); guide rails (303) are arranged on the guide rail pillars (305) parallel to the two sides of the underwater environment simulation water tank (201); a composite functional frame (211) is slidably connected between a pair of the guide rails (303); the composite functional frame (211) is connected to a sunlight radiation environment simulation component and a rainfall environment simulation component via a composite functional frame transverse groove (210); the sunlight radiation environment simulation component comprises an incandescent lamp (202) and an ultraviolet lamp (208); the rainfall environment simulation component comprises a rainfall water pipe (203) connected to the composite functional frame transverse groove (210); the rainfall water pipe (203) is connected to the water circulation module (4) via a compression pump.

6. The optical fiber vibration sensing performance testing platform for hydraulic structures under complex service environments according to claim 5 is characterized in that: The wave slamming environment simulation component comprises a wave-making board (205) slidably connected to a guide rail (303), a top fixed hanging platform (204) being arranged on the top of the wave-making board (205), the wave-making board (205) being a hollow structure with a wide top and a narrow bottom, and the top fixed hanging platform (204) being also transmission-connected to the excitation transmission module (3).

7. The optical fiber vibration sensing performance testing platform for hydraulic structures under complex service environments according to claim 6 is characterized in that: The excitation transmission module (3) comprises an exciter (301), an exciter platform (302) and a vibration transmission frame (304); the exciter platform (302) is slidably arranged on the guide rail (303); the exciter (301) is arranged on the exciter platform (302); the exciter (301) is connected to the vibration transmission frame (304) via an excitation rod (306); the vibration transmission frame (304) and the vibration platform (103) are connected via a vibration platform wing plate (102); when the exciter (301) is working, the exciter platform (302) is fixed to the guide rail (303) by a limit clamp (307).

8. The optical fiber vibration sensing performance testing platform for hydraulic structures under complex service environments according to claim 7 is characterized in that: The vibration exciter (301) is also connected to a wave slamming environment simulation component via a vibration excitation rod (306).

9. The optical fiber vibration sensing performance testing platform for hydraulic structures under complex service environments according to claim 7 is characterized in that: The vibration conduction frame (304) is a special-shaped structure, comprising a horizontal vibration conduction component (312) along the guide rail (303) and a vertical vibration conduction component (313) perpendicular to the guide rail (303); the vertical vibration conduction component (313) and the horizontal vibration conduction component (312) are both inserted through the guide rail (303) on one side; the top of the horizontal vibration conduction component (312) is provided with densely arranged notches, a vibration transmission displacement component (311) is inserted into the notch; the other end of the vibration transmission displacement component (311) is fixedly connected to the end of the excitation rod; the horizontal vibration conduction component (312) is fixedly connected to the vertical vibration conduction component (313); and both sides of the vertical vibration conduction component (313) are fixedly connected to the vibration platform wing plate (102).

10. The optical fiber vibration sensing performance testing platform for hydraulic structures under complex service environments according to claim 1 is characterized in that: The water circulation module (4) comprises a clean water tank (401), an acid ion-containing water tank (402) and a connecting pipe (403); the clean water tank (401) and the acid ion-containing water tank (402) are arranged side by side on one side of the complex service environment simulation module (2); the clean water tank (401) is provided with a water inlet (405), and a polypropylene film (404) is arranged between the clean water tank (401) and the acid ion-containing water tank (402); the clean water tank (401) and the acid ion-containing water tank (402) are respectively led out by the connecting pipe (403), and are connected to the complex service environment simulation module (2) after being arranged along the underwater environment simulation water tank (201).

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