CN110045632B - Suspension tunnel flow-solid coupling hybrid simulation test method and device - Google Patents
Suspension tunnel flow-solid coupling hybrid simulation test method and device Download PDFInfo
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Abstract
The invention discloses a suspension tunnel flow-solid coupling hybrid simulation test method and device. The method is used for analyzing and researching the fatigue problem of the suspension tunnel system under the action of the fluid. The method comprises the following specific steps: dividing the overall structure into a physical substructure and a numerical substructure; establishing a numerical simulation model for the numerical substructure based on a finite element algorithm or related software; prefabricating and mounting the physical substructure according to a full-scale model or a reduced-scale model; the loading control of the physical substructure by the calculation information of the numerical substructure and the model update of the numerical substructure by the measurement information of the physical substructure are completed through a control system, a data interaction system and a data acquisition system; and finally, monitoring and extracting required information through a visual interface. The invention can accurately capture the dynamic response performance of the key structure and overcome the problems of field limitation, high maintenance cost and the like of the traditional test technology.
Description
Technical Field
The invention relates to the technical field of civil engineering structure simulation and test, in particular to a suspension tunnel flow-solid coupling hybrid simulation test method and device.
Background
The suspension tunnel system mainly comprises a pipe body, an anchor cable, a foundation, a revetment and the like, and the operation stage also comprises running vehicles and the like. As a novel large-span deepwater traffic structure, the suspended tunnel pipe is generally longer in structural form, and shows obvious nonlinearity in geometric characteristics under the actions of self gravity, buoyancy, wave flow and environment and possibly larger rigid displacement and rotation; under the action of ocean currents, wave forces and the like, coupled vibration may occur in a moving vehicle in a tunnel, the tunnel and an environmental system; in addition, due to factors such as fluid scouring and seawater salinity distribution, the problem of fatigue damage of the suspension tunnel system under the action of the environment cannot be ignored.
In the pure numerical simulation, due to the nonlinear characteristic and the flow-solid coupling effect of the suspension tunnel system, the structural simulation calculation is difficult to perform, and a highly simplified model is mostly adopted. Under the traditional vibration table test, although the dynamic characteristics of the structure can be captured, the research on the flow-solid coupling problem of the suspension tunnel system is difficult to carry out due to the influences of factors such as site limitation, high maintenance cost and the like. Therefore, the hybrid simulation test based on the substructure technology is an effective technical means, and can accurately capture the structure dynamic response.
Disclosure of Invention
The invention mainly aims to overcome the defects in the prior art and provide a suspension tunnel flow-solid coupling hybrid simulation test method and device, which can accurately capture the dynamic response performance of a key structure and solve the problems of field limitation, high maintenance cost and the like of the traditional test technology.
In order to achieve the purpose, the invention adopts the following technical scheme: a suspension tunnel flow-solid coupling hybrid simulation test method and a device are used for analyzing and researching the fatigue problem of a suspension tunnel system under the action of fluid. The method is characterized by comprising the following specific steps:
(a) dividing the overall structure into a physical substructure and a numerical substructure;
(b) establishing a numerical simulation model for the numerical substructure based on a finite element algorithm or related software;
(c) prefabricating and mounting the physical substructure;
(d) the loading control of the physical substructure by the calculation information of the numerical substructure and the model update of the numerical substructure by the measurement information of the physical substructure are completed through a control system, a data interaction system and a data acquisition system;
(e) and monitoring and extracting required information through a visual interface.
The suspension tunnel fluid-solid coupling hybrid simulation test method and device are characterized in that the suspension tunnel pipe body, the anchor cable and the vehicle are used as physical substructures, and the fluid is used as a numerical substructure to perform simulation.
The suspension tunnel flow-solid coupling hybrid simulation test method and device comprise the following specific steps of:
(i) establishing a numerical substructure model based on various finite element theories or finite element software according to the basic information of the structure;
(ii) and (4) selecting an integral method and integral step length, and solving the motion equation of the structure.
The suspension tunnel flow-solid coupling hybrid simulation test method and device are characterized in that the specific method for processing the physical substructure is as follows:
and according to the scale and the complexity of the physical substructure model, performing factory prefabrication processing and installation on the physical substructure by using a full-scale model or a reduced-scale model.
The suspension tunnel fluid-solid coupling hybrid simulation test method and device are characterized in that the specific method for controlling the loading of the physical substructure is as follows:
(i) displacement prediction, speed prediction, acceleration prediction and internal force solution of the numerical substructure model in each numerical integration step length are completed in the control system, and a control algorithm is adopted for correction;
(ii) and reading the corrected displacement or calculated force value at the joint of the numerical substructure and the physical substructure by a data interaction system and a control system, taking the calculated displacement or calculated force value as a target displacement or target force, and loading the target displacement or target force onto the corresponding degree of freedom of the physical substructure by a loading system and a device.
Further, the specific method for updating the numerical substructure model is as follows:
and measuring the feedback quantity after the actual loading of the physical substructure by the displacement sensor and the force sensor, and transmitting the feedback quantity to the numerical substructure model by the data acquisition system and the data interaction system to be used as a calculation basis for the next integral step length.
The suspension tunnel flow-solid coupling hybrid simulation test method and device comprise the following specific steps of:
(i) establishing a communication interface with a controller on a main control computer, and regulating and controlling initial parameters on the communication interface;
(ii) the required observation point is input on the main control computer, and the dynamic response of the point is directly read through the memory.
Furthermore, the numerical substructure model is established by adopting a variable memory to store variable parameters under each integral step length, so that information transmission and updating are completed.
Furthermore, the specific method for controlling the loading of the physical substructure is as follows:
(i) if the physical substructure is a full-scale model, a loading system and a device are adopted to directly load the target displacement or the target force on the physical substructure, and the loading device can be divided into an actuator, a vibration table and an actuator-vibration table coupling device according to actual conditions;
(ii) if the physical substructure is a reduced scale model, converting the target displacement or target force into the displacement or force of the physical substructure under the reduced scale model according to similar conditions, and loading the displacement or force onto the physical substructure by a loading system and a device.
Furthermore, the specific method for updating the numerical substructure model is as follows:
(i) if the physical substructure is a full scale model, extracting the displacement or force of the physical substructure model, and directly feeding the displacement or force back to the numerical substructure;
(ii) if the physical substructure is a reduced scale model, extracting the displacement or force of the physical substructure model, converting the displacement or force into the displacement or force of the numerical substructure under the full scale model according to the similar conditions, and feeding the displacement or force back to the numerical substructure.
Compared with the prior art, the invention has the beneficial effects that:
1. the numerical simulation of the invention is not limited by a certain numerical algorithm or software and has universality.
2. The invention can relieve the problem of overlarge numerical calculation pressure when solving the dynamic response of a complex structure and the like by means of a numerical algorithm capable of parallel calculation.
3. The invention adopts a substructure-based technology, takes a complex substructure as a physical substructure, avoids the defect that a pure numerical algorithm is difficult to simulate the complex structure, saves the test cost, and can more easily complete the related tests of the suspended tunnel and surrounding structures under different research targets.
In conclusion, the invention provides a powerful means for researching the structural response of the suspension tunnel under the flow-solid problem.
Drawings
Fig. 1 is a schematic overall flow chart of an embodiment of the present invention.
Fig. 2 is a schematic diagram of a suspension tunnel fluid-solid coupling system based on a hybrid simulation test according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments, but not all embodiments, of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a suspension tunnel flow-solid coupling hybrid simulation test method and a device, wherein the overall flow schematic diagram is shown in figure 1, and the method mainly comprises the following steps: (a) dividing the overall structure into a physical substructure and a numerical substructure; (b) establishing a numerical simulation model for the numerical substructure based on a finite element algorithm or related software; (c) prefabricating and mounting the physical substructure according to a full-scale model or a reduced-scale model; (d) according to the stress condition, carrying out numerical model solution to obtain the calculation information of boundary points at the connection of the numerical substructure and the physical substructure; (e) through the control system and the data interaction system, after the calculation information of the numerical value substructure is corrected, the loading control of the physical substructure is carried out; (f) feeding back the physical substructure measurement information acquired after loading to a numerical substructure through a data interaction system and a data acquisition system, and completing model updating of the next time step; (g) and monitoring and extracting required information through a visual interface. As shown in fig. 2, the entire flow will be described in detail below.
Step one, taking a suspended tunnel pipe body, an anchor cable and a vehicle as physical substructures, and taking fluid as a numerical substructure;
and secondly, connecting the main control computer with the controller to model the numerical substructure. Simulating the fluid action by using a Morison equation;
thirdly, completing displacement prediction, speed prediction, acceleration prediction and force solution of the fluid model in each numerical integration step length in a control system, and performing displacement correction by adopting a feedforward-feedback comprehensive control algorithm;
fourthly, storing the initial model parameters, the calculated force and the displacement in the control system, and storing the variable parameters under each integral step length by adopting a variable memory to complete information transmission and updating;
and fifthly, simplifying a group of wheel shafts for the vehicle and the weight mass blocks above the wheel shafts, and making full-scale or reduced-scale models for the rest according to laboratory conditions. The fluid acting on the outer wall of the tube is simplified by a set of actuators, the corrected calculated displacement x beingi+1Loading the target displacement to the tunnel pipe body;
sixthly, reading the data F of the force sensor arranged on the tunnel pipe body by the data acquisition systemi+1Feeding back the data to the fluid model by the data interaction system so as to update the next time step;
seventhly, establishing a communication interface with the controller on the main control computer, and regulating and controlling initial parameters on the communication interface;
and step eight, inputting a point to be checked on the main control computer, and directly reading the dynamic response of the point through a memory.
The drawings in the present specification are schematic views to assist in explaining the concept of the present invention, and schematically show the shapes of respective portions and their mutual relationships. Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention as claimed in the appended claims.
Claims (9)
1. A suspension tunnel flow-solid coupling hybrid simulation test method is used for analyzing and researching the fatigue problem of a suspension tunnel system under the action of fluid; the method is characterized by comprising the following specific steps:
(a) dividing the whole structure into a physical substructure and a numerical substructure, taking the suspended tunnel pipe body, the anchor cable and the vehicle as the physical substructure, and taking the fluid as the numerical substructure to perform simulation;
(b) establishing a numerical simulation model for the numerical substructure based on a finite element algorithm;
(c) prefabricating and installing a physical substructure: simplifying a group of wheel shafts for a vehicle and a weight mass block above the wheel shafts, and making full-scale or reduced-scale models for the rest of the wheel shafts according to laboratory conditions;
(d) the fluid acting on the outer wall of the tube is simplified by a set of actuators, the corrected calculated displacement x beingi+1Loading the target displacement to the tunnel pipe body; reading, by a data acquisition system, force sensor data F mounted on the tunnel tubei+1Feeding back the data to the fluid model by the data interaction system so as to update the next time step;
(e) the loading control of the physical substructure by the calculation information of the numerical substructure and the model update of the numerical substructure by the measurement information of the physical substructure are completed through a control system, a data interaction system and a data acquisition system;
(f) and monitoring and extracting required information through a visual interface.
2. The suspended tunnel flow-solid coupling hybrid simulation test method according to claim 1, wherein the specific method for establishing the numerical substructure model in the step (b) is as follows:
(i) establishing a numerical substructure model based on various finite element theories or finite element software according to the basic information of the structure;
(ii) and (4) selecting an integral method and integral step length, and solving the motion equation of the structure.
3. The suspended tunnel flow-solid coupling hybrid simulation test method according to claim 1, wherein the specific method for processing the physical substructure in the step (c) is as follows:
and according to the scale and the complexity of the physical substructure model, performing factory prefabrication processing and installation on the physical substructure by using a full-scale model or a reduced-scale model.
4. The suspended tunnel flow-solid coupling hybrid simulation test method according to claim 1, wherein the specific method for controlling the loading of the physical substructure in the step (e) is as follows:
(i) displacement prediction, speed prediction, acceleration prediction and internal force solution of the numerical substructure model in each numerical integration step length are completed in the control system, and a control algorithm is adopted for correction;
(ii) and reading the corrected displacement or calculated force value at the joint of the numerical substructure and the physical substructure by a data interaction system and a control system, taking the calculated displacement or calculated force value as a target displacement or target force, and loading the target displacement or target force onto the corresponding degree of freedom of the physical substructure by a loading system and a device.
5. The suspended tunnel flow-solid coupling hybrid simulation test method according to claim 1, wherein the specific method for updating the numerical substructure model in the step (e) is as follows:
and the feedback quantity after the actual loading of the physical substructure is measured by the force sensor and the displacement sensor and is transmitted to the numerical substructure model by the data acquisition system and the data interaction system to be used as the calculation basis of the next integral step length.
6. The suspended tunnel flow-solid coupling hybrid simulation test method according to claim 1, wherein the specific method for extracting the required information in the step (f) is as follows:
(i) establishing a communication interface with the controller on the main control computer, and regulating and controlling each initial parameter on the interface of the main control computer;
(ii) the required observation point is input on the main control computer, and the power response of the point is directly read through the memory.
7. The suspended tunnel flow-solid coupling hybrid simulation test method as claimed in claim 2, wherein a variable memory is used to store variable parameters at each integration step length to complete information transfer and update.
8. The suspended tunnel flow-solid coupling hybrid simulation test method according to claim 4, wherein:
(i) if the physical substructure is a full-scale model, a loading device is adopted to directly load the target displacement or target force on the physical substructure, and the loading device can be divided into an actuator, a vibration table and actuator-vibration table coupling according to actual conditions;
(ii) and if the physical substructure is the reduced scale model, converting the target displacement or the target force into the displacement or the force of the physical substructure under the reduced scale model according to similar conditions, and loading the displacement or the force to the physical substructure by a loading device.
9. The suspended tunnel flow-solid coupling hybrid simulation test method according to claim 5, wherein:
(i) if the physical substructure is a full scale model, extracting the displacement or force of the physical substructure model, and directly feeding the displacement or force back to the numerical substructure;
(ii) if the physical substructure is a reduced scale model, extracting the displacement or force of the physical substructure model, converting the displacement or force into the displacement or force of the numerical substructure under the full scale model according to the similar conditions, and feeding the displacement or force back to the numerical substructure.
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