A method for visualizing the simulated oil film thickness of sliding bearings for turbines

Abstract

The present invention provides a method for visualizing the simulated oil film thickness of a sliding bearing for a turbine. The method of the present invention comprises the following steps: according to the theoretical working principle of the sliding bearing and the results of finite element analysis, the maximum and minimum oil film thickness single-tile distribution states are calculated; according to the calculated maximum and minimum oil film thickness single-tile distribution states, the construction of a wedge-shaped oil film simulation model between the thrust pad and the mirror plate is realized through a SolidWorks three-dimensional model; the dynamic data of the inlet and outlet oil film thickness during operation is collected and stored in a database; based on PC-side development, the oil film thickness simulation model is imported through Untiy3D technology to realize the three-dimensional display and interaction of the 3D information of the oil film thickness and the data of the oil film. The present invention monitors the real-time operation state of the thrust pad through the oil film thickness, and scientifically and reliably observes the operation trajectory of the thrust pad oil film thickness with a three-dimensional model, filling the gap in the visualization of the thrust pad oil film thickness and providing a more effective means of observation for the operation state of the thrust pad.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic turbine simulation, and in particular to a method for visualizing the simulated oil film thickness of a hydraulic turbine sliding bearing. Background Art

[0002] The operating status of the thrust bearing is one of the most concerned factors in the operation of the unit. With the development of smart hydropower and smart operation and maintenance in recent years, the visualization study of the oil film thickness in the operating status of the thrust bearing has important reference significance for the health diagnosis of the bearing and the unit.

[0003] Digital twin is a simulation process that integrates multiple physical quantities, multiple scales, and multiple probabilities. It uses historical data and real-time sensor updated data to depict and reflect the entire life cycle of physical objects. The virtual oil film thickness operating state is established through three-dimensional modeling methods, and data technology is used to achieve two-way real mapping and real-time interaction between real oil film thickness and virtual oil film thickness, thereby achieving real-time monitoring of oil film thickness. Data acquisition refers to the process of automatically collecting information from analog and digital test units such as sensors and other monitored equipment. By combining digital twin technology with data acquisition technology, the operating oil film thickness can be displayed in real time in a visual way. Summary of the invention

[0004] Based on the technical problems raised above, this patent provides a method for visualizing the simulated oil film thickness of sliding bearings for turbines.

[0005] To achieve the purpose of the invention, the technical solution adopted by the present invention is as follows:

[0006] A method for visualizing the simulated oil film thickness of a sliding bearing for a hydraulic turbine comprises the following steps:

[0007] Step 1: According to the theoretical working principle of the sliding bearing and the results of finite element analysis, calculate the maximum and minimum oil film thickness single bearing distribution state;

[0008] Step 2: Based on the calculated maximum and minimum oil film thickness distribution states of a single pad, a simulation model of a wedge-shaped oil film between the thrust pad and the mirror plate is constructed through a SolidWorks 3D model;

[0009] Step 3, collecting the dynamic data of the inlet and outlet oil film thickness during operation and storing them in the database;

[0010] Step 4: Based on PC development, use Untiy3D technology to import the oil film thickness simulation model to achieve three-dimensional display and interaction of oil film thickness 3D information and oil film data.

[0011] Furthermore, the maximum and minimum activity ranges of the oil film thickness of the simulation model are determined through finite element analysis, thereby determining the motion range value of the oil film thickness model; a 1:1 three-dimensional scene fine modeling is performed along the actual size of the thrust pad surface plane through Solidworks, which serves as the base surface of the oil film thickness model; and the oil film thickness simulation model is established through SolidWorks using the model plane area and motion range value.

[0012] Furthermore, the oil film thickness data stored in real time in the database is extracted and imported into the oil film thickness simulation model established in SolidWorks through Untiy3D technology. The movement range of the model is determined by the read data, and the real-time changes of the oil film thickness can be visualized.

[0013] The present invention aims to provide a method for visualizing the oil film thickness of a sliding bearing, monitor the real-time operating status of the thrust bearing through the oil film thickness, and scientifically, reliably and intuitively observe the operating trajectory of the thrust bearing oil film thickness with a three-dimensional model, thereby filling the gap in the visualization of the thrust bearing oil film thickness and providing a more effective means of observing the operating status of the thrust bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0015] Figure 1 It is a flow chart of the present invention.

[0016] Figure 2 It is a three-dimensional display diagram of oil film data in an embodiment of the present invention. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] like Figure 1 As shown, the embodiment of the present invention discloses a method for visualizing the simulated oil film thickness of a sliding bearing for a turbine, comprising the following steps:

[0019] Step 1: According to the theoretical working principle of sliding bearings and the results of finite element analysis, the maximum and minimum oil film thickness single bearing distribution states are calculated by Reynolds formula;

[0020] Step 2: Based on the calculated maximum and minimum oil film thickness distribution states of a single pad, a simulation model of a wedge-shaped oil film between the thrust pad and the mirror plate is constructed through a SolidWorks 3D model;

[0021] Step 3, collecting the dynamic data of the inlet and outlet oil film thickness during operation according to the oil film thickness sensor at the oil inlet and outlet of the single tile, and storing it in the database;

[0022] Step 4: Based on PC development, use Untiy3D technology to import the oil film thickness simulation model to achieve three-dimensional display and interaction of oil film thickness 3D information and oil film data.

[0023] Furthermore, the maximum and minimum activity ranges of the oil film thickness of the simulation model are determined through finite element analysis, thereby determining the motion range value of the oil film thickness model; a 1:1 three-dimensional scene fine modeling is performed along the actual size of the thrust pad surface plane through Solidworks, which serves as the base surface of the oil film thickness model; and the oil film thickness simulation model is established through SolidWorks using the model plane area and motion range value.

[0024] Furthermore, the oil film thickness data stored in the database in real time is extracted and imported into the oil film thickness simulation model established by SolidWorks through Untiy3D technology. The model movement range is determined by the read data, and the real-time change of oil film thickness is visualized. The final result is as follows Figure 2 shown.

[0025] The oil film thickness sensor uses a commonly used eddy current sensor to indirectly measure the gap change between the thrust bearing and the mirror plate when the sliding bearing is running. Combined with finite element analysis, the oil film morphology model is established, and the three-dimensional morphology change of the oil film is displayed through liquid filling between components. The operating environment platform is mainly for the PC side, and can be displayed and controlled through touch screen, mouse, and keyboard.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for visualizing the simulated oil film thickness of a sliding bearing for a hydraulic turbine, characterized in that: The steps include: Step 1: According to the theoretical working principle of the sliding bearing and the results of finite element analysis, calculate the maximum and minimum oil film thickness single bearing distribution state; Step 2: Based on the calculated maximum and minimum oil film thickness distribution states of a single pad, a simulation model of a wedge-shaped oil film between the thrust pad and the mirror plate is constructed through a SolidWorks 3D model; Step 3, collecting the dynamic data of the inlet and outlet oil film thickness during operation and storing them in the database; Step 4: Based on PC development, the oil film thickness simulation model is imported through Untiy3D technology to realize the three-dimensional display and interaction of oil film thickness 3D information and oil film data; Finite element analysis is used to determine the maximum and minimum ranges of the oil film thickness of the simulation model, thereby determining the range of motion of the oil film thickness model. Solidworks is used to perform 1:1 three-dimensional scene fine modeling along the actual size of the thrust pad surface plane, which serves as the base surface of the oil film thickness model. The oil film thickness simulation model is established through SolidWorks using the model plane area and range of motion. The oil film thickness data stored in real time in the database is extracted and imported into the oil film thickness simulation model established in SolidWorks through Untiy3D technology. The model movement range is determined by the read data to realize the visualization display of the real-time changes of oil film thickness.

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