A method for determining the position of a stress and vibration detection device for a vehicle rolling over an aviation fuel pipeline

Abstract

The present invention discloses a method for determining the position of a stress and vibration detection device for a vehicle-rolled aviation fuel pipeline, including establishing a vehicle-pavement simulation model; establishing a pipeline-soil interaction simulation model; loading the vehicle-pavement simulation model into the pipeline-soil interaction simulation model to obtain a dynamic response model, and setting the model boundary conditions and performing meshing; adding a vehicle rolling load; simulating the dynamic response model of the buried aviation fuel pipeline under the vehicle rolling load, analyzing the Mises stress and displacement changes of the pipeline, and thus determining the disturbance detection position of the aviation fuel pipeline under the condition of heavy vehicle rolling. The present invention simulates the dynamic response model of the buried aviation fuel pipeline under the vehicle rolling load, analyzes the Mises stress and displacement changes of the pipeline, and can achieve the determination and optimization of the disturbance detection position of the aviation fuel pipeline under the condition of heavy vehicle rolling, thereby achieving the purpose of further optimizing the pipeline third-party damage disturbance detection system.

Description

Technical Field

[0001] The invention relates to a method for determining the position of a stress and vibration detection device for a vehicle rolling over an aviation fuel pipeline, and belongs to the technical field of third-party disturbance detection. Background Art

[0002] At present, the aviation fuel pipelines laid in my country need to cross multiple levels of roads, including national highways, provincial highways and various rural roads. Therefore, ground activities around the pipelines are becoming more frequent, and the aviation fuel pipelines are facing increasing risks of third-party construction damage such as vehicle crushing and soil pile occupation. Once a damage accident occurs, it will cause great losses. Similarly, to a certain extent, it will greatly affect the safe, healthy, rapid and sustainable development of the pipeline logistics industry. Therefore, it is particularly important to ensure that the aviation fuel pipeline can operate safely under the crushing of various heavy vehicles.

[0003] The loads borne by the section where the aviation fuel pipeline intersects with the road mainly include dead loads such as the dead weight of the pipeline structure and soil pressure, and live loads such as vehicle rolling load, ground heap load, temperature load, and pipeline internal pressure. The most important live load is the vehicle load. When a vehicle passes through the pipeline, the maximum stress point of the pipeline is not directly below the wheel. The current common pipeline stress detection device is generally only set directly above the pipeline or at the three o'clock or nine o'clock position, and cannot effectively measure the maximum stress point of the pipeline. The area near the maximum stress point of the pipeline is most likely to be damaged or even fail. This puts forward requirements for the installation position of the pipeline stress and vibration device-focus on the area near the maximum stress point of the pipeline. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a method for determining the position of a stress and vibration detection device for an aviation fuel pipeline under vehicle crushing. The present invention targets the actual operation and production of the aviation fuel pipeline, collects field data of third-party disturbances caused by heavy vehicle crushing on the pipeline in real situations, and establishes a dynamic response model of the buried aviation fuel pipeline under vehicle crushing load: MSC.Adams software is used to establish a vehicle-pavement coupling model, and the process of the vehicle driving over the pavement is simulated; ABAQUS software is used to establish a finite element model of the aviation fuel pipeline-soil interaction, and the dynamic response model of the aviation fuel pipeline under vehicle crushing load is simulated, so as to determine the stress state and vibration condition of the pipeline, and finally determine the installation position of the stress and vibration detection device for the aviation fuel pipeline under vehicle crushing load.

[0005] The technical solution provided by the present invention to solve the above technical problems is: a method for determining the position of a stress and vibration detection device for a vehicle rolling over an aviation fuel pipeline, comprising the following steps:

[0006] Step S1, establishing a vehicle-road simulation model;

[0007] Step S2, establishing a pipeline-soil interaction simulation model;

[0008] Step S3, loading the vehicle-pavement simulation model into the pipeline-soil interaction simulation model to obtain a dynamic response model, and setting the model boundary conditions and performing meshing;

[0009] Step S4, adding a vehicle rolling load to obtain a dynamic response model of the buried aviation fuel pipeline under the vehicle rolling load;

[0010] Step S5, simulating the dynamic response model of the buried aviation fuel pipeline under vehicle rolling load, analyzing the Mises stress and displacement changes of the pipeline, so as to determine the disturbance detection position of the aviation fuel pipeline under heavy vehicle rolling and optimize it.

[0011] A further technical solution is that the specific process of step S1 is: establishing a whole vehicle model in MSC.Adams software, then assuming that the road elevation function conforms to a stationary random process to establish a random road surface, after coupling the vehicle-road model, extracting the dynamic load coefficient of each wheel, and calculating the pressure of the wheel on the road surface, thereby establishing a vehicle-road surface simulation model.

[0012] A further technical solution is that the specific process of step S2 is: the soil body uses the DP model in ABAQUS, the pipeline model uses the linear elastic model, the soil body and pipeline parameters are input into the model, and finally a pipeline-soil interaction simulation model is established based on actual data of vehicle rolling in real situations.

[0013] A further technical solution is that the pipeline parameters include density, elastic modulus, and Poisson's ratio.

[0014] A further technical solution is that the actual data includes tire contact area, road width, and pipeline buried depth.

[0015] A further technical solution is that the specific process of step S3 is: loading the vehicle-pavement simulation model into the pipeline-soil interaction simulation model to obtain a dynamic response model, wherein a fixed constraint is imposed on the bottom of the soil in the dynamic response model, a symmetric constraint is imposed on the symmetry surface, a surface-to-surface contact is adopted between the pipeline and the soil, and the mesh of the soil unit around the pipeline is encrypted, while the mesh of the unit far away from the pipeline is loosened to improve the calculation speed of the model.

[0016] A further technical solution is that the specific process of step S4 is: using the VDLOAD subroutine to load the vehicle crushing load in the dynamic response model, and using the pressure of each wheel of the vehicle on the road surface obtained by Adams multi-body dynamics simulation as an excitation source, thereby obtaining a dynamic response model of the buried aviation fuel pipeline under the vehicle crushing load.

[0017] A further technical solution is that the specific process of step S5 is as follows: simulating the dynamic response model of the buried aviation fuel pipeline under vehicle rolling load, analyzing its dynamic response characteristics, deriving the Mises stress cloud map at the moment of maximum stress of the pipeline, and finally obtaining the stress state and vibration characteristics of the pipeline under vehicle rolling, and setting stress and vibration detection devices every 15° at key detection positions, i.e., 70%-100% of the maximum stress of the pipeline and 70%-100% of the maximum cross-sectional deformation of the pipeline, so as to finally optimize the distribution of the installation positions of the detection devices.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] 1. A reasonable vehicle-road coupling model was established using MSC.Adams software to simulate the process of the vehicle driving over the road. The influence of the vehicle weight and driving speed were considered in the simulation, and the wheel force data of each wheel was extracted separately;

[0020] 2. A finite element model of pipeline-soil interaction was established using ABAQUS software. The calculation results of MSC.Adams software were imported, and the VLOAD subroutine was used to implement the loading of dynamic loads. At the same time, factors such as the dynamics, mobility and rectangular footprint of the vehicle crushing load were taken into account, which made up for the deficiency that the mobility and dynamics of the vehicle crushing load were not taken into account in existing studies. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the vehicle-road model of Adams software;

[0022] Figure 2 This is a schematic diagram of the finite element model of pipeline-soil interaction in ABAQUS software;

[0023] Figure 3 This is the maximum Mises stress cloud diagram of the pipeline under vehicle rolling condition;

[0024] Figure 4 This is a schematic diagram of the stress change of the maximum force cross section of the pipeline under vehicle rolling;

[0025] Figure 5 This is a schematic diagram of the maximum stress cross-sectional deformation of the pipeline under vehicle rolling conditions;

[0026] Figure 6 Schematic diagram of the location of the stress and vibration detection device of the pipeline under vehicle rolling condition. DETAILED DESCRIPTION

[0027] In order to make the purpose, 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 and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] A method for determining the position of a stress and vibration detection device for a vehicle rolling over an aviation fuel pipeline according to the present invention specifically comprises the following steps:

[0029] Step S1, establishing a vehicle-road simulation model;

[0030] First, a vehicle model is established in MSC.Adams software. Then, a random road surface is established by assuming that the road elevation function conforms to a stationary random process. After coupling the vehicle-road model, the dynamic load coefficient of each wheel is extracted, and the pressure of the wheel on the road surface is calculated. Finally, a vehicle-road simulation model is established.

[0031] Step S2, establishing a pipeline-soil interaction simulation model;

[0032] The soil body uses the DP model in ABAQUS, and the pipeline model uses the linear elastic model. The density, elastic modulus, Poisson's ratio and other parameters of the soil and pipeline are input into the model. Finally, the pipeline-soil interaction simulation model is established based on the actual data such as the tire contact area of ​​the vehicle rolling over, the road width, and the buried depth of the pipeline.

[0033] Step S3, loading the vehicle-pavement simulation model into the pipeline-soil interaction simulation model to obtain a dynamic response model, and setting the model boundary conditions and performing meshing;

[0034] The vehicle-road simulation model is loaded into the pipeline-soil interaction simulation model. A fixed constraint is applied to the bottom of the model soil, a symmetric constraint is applied to the symmetric surface, and a surface-to-surface contact is adopted between the pipeline and the soil. A "hard contact" is set in the normal direction of the contact surface. In order to improve the calculation accuracy of the model, the mesh of the soil unit around the pipeline is encrypted; at the same time, the unit mesh far away from the pipeline is loose to improve the calculation speed of the model.

[0035] Step S4, adding vehicle rolling load;

[0036] The vehicle rolling load is loaded using the VDLOAD subroutine, and the pressure of each wheel on the road surface obtained by Adams multi-body dynamics simulation is used as the excitation source;

[0037] Step S5, determining the installation position and optimization of the online detection device;

[0038] The dynamic response model of the buried aviation fuel pipeline under vehicle rolling load is simulated, its dynamic response characteristics are analyzed, and the Mises stress cloud map at the moment of maximum stress of the pipeline is derived. Finally, the stress state and vibration characteristics of the pipeline under vehicle rolling can be obtained. Stress and vibration detection devices are set every 15° at the key detection positions, i.e., 70%-100% of the maximum stress of the pipeline and 70%-100% of the maximum cross-sectional deformation of the pipeline, so as to finally optimize the installation position distribution of the detection device.

[0039] Example

[0040] (1) Establish a vehicle-road simulation model;

[0041] First, based on the actual working conditions, a multi-body dynamics model of vehicle-road coupling is established in the Adams module, and parameters such as wheelbase, track width, and body length are input. Then a random road model is established in the Adams software, and then it is assumed that the road elevation function conforms to a stationary random process. After assembly, the model diagram is as follows: Figure 1 After the vehicle-road model is coupled, the dynamic load coefficient of each wheel is extracted and the pressure of the wheel on the road is calculated.

[0042] (2) Establish a pipeline-soil interaction simulation model;

[0043] The soil body uses the DP model in ABAQUS, and the pipeline model uses the linear elastic model. The soil and pipeline density, elastic modulus, Poisson's ratio and other parameters are input into the model. The vehicle rolling load is evenly distributed on the contact surface. Finally, the pipeline-soil interaction simulation model is established based on the actual data such as the tire contact area, road width, pipeline buried depth and position of the vehicle rolling in the actual situation.

[0044] (3) Setting model boundary conditions and meshing;

[0045] The vehicle-road simulation model is loaded into the pipeline-soil simulation model. A fixed constraint is applied to the bottom of the model soil, a symmetric constraint is applied to the symmetric surface, and a surface-to-surface contact is adopted between the pipeline and the soil. A "hard contact" is set in the normal direction of the contact surface. In order to improve the calculation accuracy of the model, the mesh of the soil unit around the pipeline is encrypted; at the same time, the mesh of the unit far from the pipeline is loosened to improve the calculation speed of the model. The final mesh division is as follows: Figure 2 shown.

[0046] (4) Add vehicle rolling load;

[0047] The vehicle rolling load is loaded using the VDLOAD subroutine, and the pressure of each wheel on the road surface obtained by Adams multi-body dynamics simulation is used as the excitation source.

[0048] (5) Determine the installation location and optimization of the online detection device;

[0049] The dynamic response model of the buried aviation fuel pipeline under vehicle rolling load is simulated and its dynamic response characteristics are analyzed, such as Figure 3 As shown in the figure, the Mises stress cloud diagram of the pipeline at the moment of maximum stress is exported, and the pipeline at Figure 4 The stress state under vehicle rolling shown in the figure and Figure 5 The vibration characteristics of a vehicle under running over are shown.

[0050] From the stress state diagram, we can see that when a vehicle runs over the soil covering the pipeline, the upper part of the pipeline facing the direction of the vehicle, that is, Figure 4 The stress of the pipeline is the largest in the 330°~0° area, and this position is the most vulnerable point of the pipeline. The Mises stress in the 150°~180° area opposite to it is the smallest. Therefore, the pipeline stress measurement position can be optimized. For the maximum stress of the aviation fuel pipeline under this test condition, the stress and vibration detection devices are arranged every 15° at the position of 70%-100%. Regarding the cross-sectional deformation of the pipeline at the moment of maximum stress, when the vehicle passes over the pipeline from left to right, under the action of the vehicle rolling load, the position of the pipeline moves to the lower right as a whole, and the deformation of the lower right side of the pipeline is large. Therefore, the pipeline displacement measurement position can be optimized. For the maximum stress cross-sectional change of the aviation fuel pipeline under this test condition, the stress and vibration detection devices are arranged every 15° at the position of 70%-100%. The final optimization layout diagram of the detection position is shown in the figure below. Figure 6 shown.

[0051] This method simulates the dynamic response model of the buried aviation fuel pipeline under vehicle rolling load, analyzes the Mises stress and displacement changes of the pipeline, and can determine and optimize the disturbance detection position of the aviation fuel pipeline under heavy vehicle rolling, thereby achieving the purpose of further optimizing the pipeline third-party damage disturbance detection system.

[0052] Obviously, the above embodiments of the present invention are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A method for determining the position of a stress and vibration detection device for a vehicle rolling over an aviation fuel pipeline, characterized in that: The following steps are involved: Step S1, establishing a vehicle-road simulation model; The whole vehicle model is established in MSC.Adams software, and then the road elevation function is assumed to conform to a stationary random process to establish a random road surface. After coupling the vehicle-road model, the dynamic load coefficient of each wheel is extracted, and the pressure of the wheel on the road surface is calculated, thereby establishing a vehicle-road simulation model. Step S2, establishing a pipeline-soil interaction simulation model; The soil body uses the DP model in ABAQUS, and the pipeline model uses the linear elastic model. The soil and pipeline parameters are input into the model, and finally the pipeline-soil interaction simulation model is established based on the actual data of vehicle rolling in real situations. Step S3, loading the vehicle-pavement simulation model into the pipeline-soil interaction simulation model to obtain a dynamic response model, and setting the model boundary conditions and performing meshing; The vehicle-pavement simulation model is loaded into the pipeline-soil interaction simulation model to obtain a dynamic response model. In the dynamic response model, a fixed constraint is imposed on the bottom of the soil, a symmetric constraint is imposed on the symmetric surface, and a surface-to-surface contact is adopted between the pipeline and the soil. The mesh of the soil unit around the pipeline is encrypted, and the mesh of the unit far away from the pipeline is loosened to improve the calculation speed of the model. Step S4, adding a vehicle rolling load to obtain a dynamic response model of the buried aviation fuel pipeline under the vehicle rolling load; In the dynamic response model, the VDLOAD subroutine is used to load the vehicle rolling load, and the pressure of each wheel on the road surface obtained by Adams multi-body dynamics simulation is used as the excitation source to obtain the dynamic response model of the buried aviation fuel pipeline under the vehicle rolling load. Step S5, simulating the dynamic response model of the buried aviation fuel pipeline under vehicle rolling load, analyzing the Mises stress and displacement changes of the pipeline, so as to determine the disturbance detection position of the aviation fuel pipeline under heavy vehicle rolling and optimize it; The dynamic response model of the buried aviation fuel pipeline under vehicle rolling load is simulated, its dynamic response characteristics are analyzed, and the Mises stress cloud map at the moment of maximum stress of the pipeline is derived. Finally, the stress state and vibration characteristics of the pipeline under vehicle rolling are obtained. Stress and vibration detection devices are set every 15° at the key detection positions, i.e., 70%-100% of the maximum stress of the pipeline and 70%-100% of the maximum cross-sectional deformation of the pipeline, so as to finally optimize the installation position distribution of the detection device.

2. The method for determining the position of a stress and vibration detection device for a vehicle rolling over an aviation fuel pipeline according to claim 1, characterized in that: The pipeline parameters include density, elastic modulus, and Poisson's ratio.

3. The method for determining the position of a stress and vibration detection device for a vehicle rolling over an aviation fuel pipeline according to claim 1, characterized in that: The actual data include tire contact area, road width, and pipeline buried depth.

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