Method, device, equipment, storage medium and product for determining blade dynamic strain measurement points

Abstract

The present application discloses a method, apparatus, device, storage medium, and product for determining blade dynamic strain measurement points. The method comprises the following steps: S1, calculating blade modes using finite element software, and calculating the dynamic strain sensitivities of different blade nodes in different directions based on information of all finite element nodes at each order derived from the finite element calculation results; S2, screening and searching for the maximum dynamic strain sensitivity from the dynamic strain sensitivities of different nodes in different directions to obtain the optimal blade dynamic strain measurement point location and measurement direction of the strain gauge, as well as the minimum sensitivity of the modal group; S3, similarly calculating the group sensitivity, optimal measurement point location, and group optimal measurement direction of all modal groupings to obtain the optimal blade dynamic strain measurement point location and measurement direction of all strain gauges, as well as the minimum sensitivity of the modal group. The present application avoids missing optimal measurement points, is economical, fast, and has high test sensitivity, and can determine more reasonable dynamic strain measurement points and measurement directions.

Description

Technical Field

[0001] The present invention relates to the technical field of turbine machinery blade dynamic strain measurement, and in particular to a blade dynamic strain measurement point determination method, device, equipment, storage medium and product. Background Art

[0002] Turbine equipment is widely used in industries such as power, chemical engineering, aviation, and aerospace. It is critical for national defense and industrial production, and blades are core components of turbine equipment. Multimodal dynamic strain monitoring of turbine blades plays a key role in equipment safety and life assessment. Because blades are susceptible to multimodal vibrations under complex aerodynamic and thermomechanical coupling loads, monitoring only a single mode can easily overlook the potential risk of high-order resonances, leading to structural failures such as fatigue cracks. Therefore, when using strain gauges (strain gauges) to implement multimodal blade vibration monitoring, it is necessary to more accurately and comprehensively capture the multimodal dynamic strain vibration signals.

[0003] Currently, the primary approach to strain monitoring on rotating turbine blades is to attach strain gauges to the blades and connect them to slip rings via leads. The slip rings transmit the blade's dynamic strain signals to a data acquisition device, ultimately enabling dynamic strain acquisition of the blades. Due to factors such as limited space on the blade surface, strain gauge costs, and the limited number of slip ring channels, the number of strain gauge measurement locations is limited. Each test can only utilize a very limited number of measurement points, while monitoring multiple blades and multiple (even dozens) modes. Consequently, practical testing presents the challenge of using a relatively small number of strain gauges to monitor multiple blade modes and ensure that the dynamic strain sensitivity of each monitored mode (including critical and critical modes) meets certain standard values.

[0004] The traditional method of determining dynamic strain measurement points cannot select the optimal measurement point position from all the "finite element nodes" on the blade surface, but only selects the best point from a limited number of alternative points. This will miss the best measurement point and thus reduce the sensitivity of measuring strain. Summary of the Invention

[0005] On one hand, the present application provides a method for determining blade dynamic strain measurement points, which is used to solve the technical problem that the existing traditional method for determining dynamic strain measurement points may miss the best measurement points, thereby reducing the sensitivity of measuring strain.

[0006] This application is implemented through the following scheme:

[0007] A method for determining blade dynamic strain measurement points, comprising the steps of:

[0008] S1. Calculate the blade modes using finite element software, and calculate the dynamic strain sensitivity of different blade nodes in different directions based on the information of all finite element nodes at each order derived from the finite element calculation results;

[0009] S2. After screening and searching for the maximum value of the dynamic strain sensitivity from the dynamic strain sensitivities of different nodes and directions, the optimal measuring point position and measuring direction of the blade dynamic strain of the corresponding strain gauge and the minimum sensitivity of the modal group are obtained;

[0010] S3. Calculate the group sensitivity, optimal measurement point position, and group optimal measurement direction of all modal groups, that is, obtain the optimal measurement point position and measurement direction of the blade dynamic strain of all strain gauges and the minimum sensitivity of the modal group.

[0011] Furthermore, the step S1 specifically includes the steps of:

[0012] S11. Calculate the blade mode using finite element software, derive the first and third principal strains, equivalent strains, and strain tensors of all finite element nodes at each order from the finite element calculation results, obtain the strain tensor of the pasteable surface nodes, and the largest first principal strain in the blade node results.

[0013] Furthermore, the step S2 specifically includes the steps of:

[0014] S21. For modal group G k , calculate all the pasteable surface nodes in the modal group G k The maximum sensitivity of each order, the maximum sensitivity value set is A, and the elements in A are: the maximum sensitivity of node i at order j;

[0015] S22. Screen the nodes that can be pasted in step S21. The nodes meet the following conditions: their sensitivity of each order is greater than or equal to a%, where the value of a% is set according to the actual situation. The remaining nodes are represented by set B.

[0016] S23, calculating the point sensitivity and the optimal measurement direction of all nodes in set B according to the normal strains of each order of each node in set B at different angles;

[0017] S24. Take the maximum value from the point sensitivity of all nodes as the modal group G k The group sensitivity of the maximum value is the position of the point corresponding to the best measurement point, and the best measurement direction of the corresponding point is the modal group G. k The optimal measurement direction of the group, thus obtaining the strain gauge SG k The optimal measurement point position, minimum sensitivity of the modal group and the optimal measurement direction.

[0018] Furthermore, the step S23 specifically includes the following steps:

[0019] S231. For a node in set B, traverse and calculate the normal strains of each order of the node in different angle directions, calculate the minimum sensitivity of all modes at each angle as the angle sensitivity, and obtain the angle sensitivity of all angles;

[0020] S232. Search for the maximum value of the sensitivity of a node in the set B at all angles as the point sensitivity of the node, and the angle corresponding to the point sensitivity is the optimal measurement direction of the node;

[0021] S233 , according to step S231 to step S232 , calculate and obtain the point sensitivity and the optimal measurement direction of all nodes in set B.

[0022] Furthermore, in step S21, the calculated i Node No. j The maximum sensitivity method of order is:

[0023] ;

[0024] in: is the coordinate position of the measuring point, The strain gauge patch test direction is For strain gauges Sensitivity under the first mode; For strain gauges Coordinate position, in The strain values ​​monitored in the direction are obtained through finite element calculation; For the The maximum modal strain value under the order mode, where the maximum modal strain value is the maximum value of the first principal strain, third principal strain (absolute value) or equivalent strain of all nodes on the blade surface.

[0025] Furthermore, in step S22, a% is set to 30%.

[0026] On the other hand, the present application also provides a device for determining blade dynamic strain measurement points, comprising:

[0027] The finite element calculation module is used to calculate the blade mode using finite element software. The dynamic strain sensitivity of different nodes and directions of the blade is calculated based on the information of all finite element nodes at each order derived from the finite element calculation results.

[0028] The screening and searching module is used to screen and search the maximum value of the dynamic strain sensitivity from the dynamic strain sensitivities of different nodes and directions, and then obtain the optimal measurement point position and measurement direction of the blade dynamic strain and the minimum sensitivity of the modal group;

[0029] The cyclic calculation module is used to calculate the group sensitivity, optimal measurement point position and group optimal measurement direction of all modal groups, that is, to obtain the optimal measurement point position and measurement direction of all strain gauges and the minimum sensitivity of the modal group.

[0030] On the other hand, the present application also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the blade dynamic strain measurement point determination method when executing the computer program.

[0031] On the other hand, the present application further provides a storage medium, which includes a stored program. When the program is executed, the device where the storage medium is located is controlled to execute the steps of the method for determining blade dynamic strain measurement points.

[0032] On the other hand, the present application also provides a computer program product, including a computer program or computer executable instructions, which, when executed by a processor, implements the steps of the method for determining blade dynamic strain measurement points.

[0033] Compared with the existing technology, this application has the following beneficial effects:

[0034] The present application provides a method for determining blade dynamic strain measurement points. This method calculates the dynamic strain sensitivity of different nodes in different directions based on information such as the strain tensor of a finite element node. After screening and searching for the point with the maximum dynamic strain sensitivity, the optimal blade dynamic strain measurement point location and measurement direction are obtained. Compared with traditional methods, the present application can be automatically executed through a program. After calculating and obtaining the required information file in the finite element software, the optimal measurement point location of the strain gauge, the minimum sensitivity of the modal group, and the optimal measurement direction can be directly calculated by the compiled computer program, which is quick and convenient. In addition, because the present application uses all finite element nodes as candidate points for calculation, it avoids missing the optimal measurement point, maximizes the minimum value of the dynamic strain sensitivity in all measured modes, and thus improves the sensitivity of the strain gauge. The present application's method for determining blade dynamic strain measurement points is economical, fast, and highly sensitive. It can be applied to the design of dynamic strain measurement tests for turbine machinery blades, thereby determining more reasonable dynamic strain measurement points and measurement directions.

[0035] In addition to the above-described purposes, features and advantages, the present application also has other purposes, features and advantages. The present application will be further described in detail below with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings, which constitute part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation of this application.

[0037] Figure 1 1 is a flow chart of a method for determining blade dynamic strain measurement points according to a preferred embodiment of the present application;

[0038] Figure 2 The figure shows a sensitivity curve diagram of a certain node in a certain modal group within the angle range of -90 degrees to +90 degrees in the embodiment;

[0039] Figure 3 A schematic diagram showing the relationship between the blade surface and the surface where the strain gauge can be attached;

[0040] Figure 4 This is a schematic diagram of a module of a device for determining blade dynamic strain measurement points according to a preferred embodiment of the present application;

[0041] Figure 5 This is a schematic block diagram of an electronic device according to a preferred embodiment of the present application;

[0042] Figure 6 It is a diagram of the internal structure of a computer device according to a preferred embodiment of the present application. DETAILED DESCRIPTION

[0043] The embodiments of the present application are described in detail below with reference to the accompanying drawings, but the present application can be implemented in a variety of different ways defined and covered below.

[0044] The concept of "strain gauge attachable surface" is involved in determining strain gauge placement. Because blade surfaces have relatively flat surfaces (i.e., surfaces with minimal curvature) at the base and back of the blade, as well as surfaces with greater curvature at the top and edges, strain gauges are generally attached to relatively flat surfaces to ensure they remain attached during high-speed rotation and maintain signal quality. Therefore, this "relatively flat surface" where strain gauges can be attached is referred to as the "attachable surface" (hereinafter referred to as the "attachable surface").

[0045] Finite element calculations directly obtain the strain tensors (and stress tensors) at the blade nodes, while strain gage monitoring experiments typically obtain the normal strain in a specific direction at a point on the blade surface. Before conducting the experiment, finite element calculations are required to determine the point of maximum normal strain and its direction on the blade surface. Correlating the blade dynamic strain (and stress) obtained by finite element calculations with the strain measured by strain gages is a crucial step in strain monitoring experiments. The following describes a method for determining the direction of the normal strain at a point on the blade surface using finite element methods.

[0046] The engineering strain array of a blade point can be calculated by the finite element calculation program , Expressed as:

[0047] ;

[0048] Where: 、 、 are engineering line strains, respectively; 、 、 are the engineering shear strains respectively. The Cauchy strain tensor of a point on the blade is for:

[0049] ;

[0050] Where: 、 、 are the positive strain components respectively; 、 、 etc. are the shear strain components. The Cauchy strain tensor is obtained from the strain matrix:

[0051] ;

[0052] The Cauchy strain tensor is a symmetric tensor that can fully express the stress state at a point. The maximum principal strain at a point on the blade is calculated from the strain tensor. , that is, to find the maximum value of the eigenvalue of the determinant of the strain tensor. For any direction vector , the linear strain in this direction is expressed as:

[0053] ;

[0054] For the maximum principal strain , and its direction cosine is recorded as , according to the relationship between the strain tensor and the principal strain, we have the following formula:

[0055] ;

[0056] The maximum principal strain can be obtained based on the relationship between the strain tensor and the principal strain Direction cosines This direction cosine determines the direction of the maximum principal strain at a point on the blade under a specific mode. This direction can be used to determine the blade's critical state and provide a basis for calculating its fatigue life. It can also determine the optimal orientation of strain gauges when monitoring dynamic strain on the blade. At a point on the blade surface, the direction of the maximum principal strain should be tangent to the blade's curved surface.

[0057] Before performing the calculation, the known conditions include: the number of strain gauge patches on each blade P , all modal orders H (H = 1, 2, 3, ..., m ), the number of finite element nodes on the blade surface n b, the number of finite element nodes on the blade surface that can be attached n g The modal grouping numbers are G1, G2, G3, ..., G k ,…, the corresponding measuring point strain gauges are denoted as SG1, SG2, SG3,…, SG k 、…。

[0058] like Figure 1 As shown, a preferred embodiment of the present application provides a method for determining blade dynamic strain measurement points, comprising the steps of:

[0059] S1. Calculate the blade mode using finite element software, and calculate the dynamic strain sensitivity of different nodes and directions of the blade based on the information of all finite element nodes at each order derived from the finite element calculation results. When calculating the blade mode using the finite element software, derive the first and third principal strains, equivalent strains, and strain tensors of all finite element nodes at each order from the finite element calculation results, obtain the strain tensor of the pasteable surface node, and the largest first principal strain in the blade node results;

[0060] S2. After screening and searching for the maximum value of the dynamic strain sensitivity from the dynamic strain sensitivities of different nodes and directions, the optimal measuring point position and measuring direction of the blade dynamic strain of the corresponding strain gauge and the minimum sensitivity of the modal group are obtained;

[0061] S3. Calculate the group sensitivity, optimal measurement point position, and group optimal measurement direction of all modal groups, that is, obtain the optimal measurement point position and measurement direction of the blade dynamic strain of all strain gauges and the minimum sensitivity of the modal group.

[0062] The present application provides a method for determining blade dynamic strain measurement points. This method calculates the dynamic strain sensitivity of different nodes in different directions based on information such as the strain tensor of a finite element node. After screening and searching for the point with the maximum dynamic strain sensitivity, the optimal blade dynamic strain measurement point location and measurement direction are obtained. Compared with traditional methods, the present application can be automatically executed through a program. After calculating and obtaining the required information file in the finite element software, the optimal measurement point location of the strain gauge, the minimum sensitivity of the modal group, and the optimal measurement direction can be directly calculated by the compiled computer program, which is quick and convenient. In addition, because the present application uses all finite element nodes as candidate points for calculation, it avoids missing the optimal measurement point, maximizes the minimum value of the dynamic strain sensitivity in all measured modes, and thus improves the sensitivity of the strain gauge. The present application's method for determining blade dynamic strain measurement points is economical, fast, and highly sensitive. It can be applied to the design of dynamic strain measurement tests for turbine machinery blades, thereby determining more reasonable dynamic strain measurement points and measurement directions.

[0063] Preferably, the step S2 specifically includes the steps of:

[0064] S21. For modal group Gk , calculate all the pasteable surface nodes in the modal group G k The maximum sensitivity of each order, the maximum sensitivity value set is A, and the elements in A are: the maximum sensitivity of node i at order j;

[0065] S22. Screen the nodes that can be pasted in step S21. The nodes meet the following conditions: their sensitivity of each order is greater than or equal to a%, where the value of a% is set according to the actual situation. The remaining nodes are represented by set B.

[0066] S23, calculating the point sensitivity and the optimal measurement direction of all nodes in set B according to the normal strains of each order of each node in set B at different angles;

[0067] S24. Take the maximum value from the point sensitivity of all nodes as the modal group G k The group sensitivity of the maximum value is the position of the point corresponding to the best measurement point, and the best measurement direction of the corresponding point is the modal group G. k The optimal measurement direction of the group, thus obtaining the strain gauge SG k The optimal measurement point position, minimum sensitivity of the modal group and the optimal measurement direction.

[0068] Preferably, the step S23 specifically includes the steps of:

[0069] S231. For a node in set B, traverse and calculate the normal strains of each order of the node in different angle directions, calculate the minimum sensitivity of all modes at each angle as the angle sensitivity, and obtain the angle sensitivity of all angles;

[0070] S232. Search for the maximum value of the sensitivity of a node in the set B at all angles as the point sensitivity of the node, and the angle corresponding to the point sensitivity is the optimal measurement direction of the node;

[0071] S233 , according to step S231 to step S232 , calculate and obtain the point sensitivity and the optimal measurement direction of all nodes in set B.

[0072] Preferably, in step S21, the calculated i Node No. j The maximum sensitivity method of order is:

[0073] ;

[0074] in: is the coordinate position of the measuring point, The strain gauge patch test direction is For strain gauges Sensitivity under the first mode; For strain gauges Coordinate position, in The strain values ​​monitored in the direction are obtained through finite element calculation; For the The maximum modal strain value under the order mode, where the maximum modal strain value is the maximum value of the first principal strain, third principal strain (absolute value) or equivalent strain of all nodes on the blade surface.

[0075] Preferably, in step S22, a% is set to 30%, which has the following advantages and purposes: ensuring that the vibration stress at the patch position is of sufficient magnitude (the maximum stress of many orders of blades is not high), having a sufficient signal-to-noise ratio, ensuring that the strain gauge at the patch position can effectively identify the actual vibration stress, and ensuring a small measurement error.

[0076] The application is further described below through another embodiment.

[0077] First, the applicable application scenarios of this embodiment are introduced. This embodiment can be applied to the test design of turbine blades. Before measuring the dynamic strain of turbine blades, more reasonable dynamic strain measurement points and measurement directions can be determined according to this method. Figure 2 The figure shows the sensitivity curve of a certain node in a certain modal group within the angle range of -90 degrees to +90 degrees in the embodiment; Figure 3 The relationship between the blade surface and the surface where the strain gauge can be attached is shown.

[0078] A method for determining blade dynamic strain measurement points, comprising the steps of:

[0079] Step S101: Calculate the blade mode using finite element method to obtain the first and third principal strains, equivalent strains and strain tensors of all finite element nodes at each order, obtain the strain tensors of the pasteable surface nodes, and the largest first principal strain in the blade node results.

[0080] Known modal group G k In this embodiment, one modal group is G1, which specifically includes: mode 5, mode 6, mode 7, mode 8, mode 9, mode 12, mode 14, and mode 15; the other modal group is G2, which specifically includes mode 1, mode 2, mode 3, mode 4, mode 10, mode 11, mode 13, and mode 16. There are two modal groups in total, that is, it is expected to implement two measurement points (on each blade). It should be noted that the two measurement points in this embodiment are implemented at different positions on the same blade. In other embodiments, two strain measurement points can also be implemented on the two blades respectively.

[0081] Step S102: Calculate the maximum sensitivity of all the pasteable surface nodes in the modal group G1 , the maximum sensitivity value set is A, the elements in A are:i Node No. j The maximum sensitivity of the order is recorded as .

[0082] Step S103: Screen the nodes that can be pasted to the surface, and those that meet the condition that their sensitivity of each order is greater than or equal to a%, where a% in this embodiment is 40%, and the remaining nodes are represented by set B.

[0083] Step S104: For a node in set B (finite element node number 6711), traverse and calculate the normal strains of each order of this node in different angle directions; obtain the sensitivity of this node at all angles, such as Figure 2 As shown, it shows that the modal group G of a certain node is within the angle range of -90 degrees to +90 degrees. k For a certain angle on the horizontal axis, the sensitivity curve under the angle is calculated, and the minimum sensitivity of all modes under this angle is the sensitivity under the angle.

[0084] Step S105: Search for the maximum sensitivity at all angles for this node (finite element node number 6711). The angles corresponding to this maximum and second-maximum values ​​are the point sensitivity and optimal measurement direction. For node 6711, the point sensitivity and optimal measurement direction are graphically shown. The point sensitivity is 19.2%, and the optimal measurement direction is (0.2100, 0.1770, 0.9615).

[0085] Step S106: Execute the calculations of step S104 and step S105 for all nodes in set B; obtain the point sensitivity and point optimal measurement direction of all nodes.

[0086] Step S107: Search for the maximum value among the point sensitivities of all nodes. The maximum value among the point sensitivities is the minimum sensitivity of the modal group. The corresponding point is the optimal measurement point of strain gauge SG1. The optimal measurement direction corresponding to this point sensitivity is the optimal measurement direction of strain gauge SG1. The optimal measurement point of strain gauge SG1 is obtained as node 6711, the minimum sensitivity of the modal group is 19.2%, and the optimal measurement direction is (0.2100, 0.1770, 0.9615).

[0087] Step S108: Perform the calculations of steps S102 to S107 for all modal groups; that is, obtain the optimal measurement point positions, minimum sensitivity of the modal group, and optimal measurement directions of all strain gauges (see Table 1).

[0088] Table 1: Strain gauge measurement point results

[0089]

[0090] The above is the optimal measurement point position of the strain gauge, the minimum sensitivity of the modal group, and the optimal measurement direction obtained from the finite element calculation information; the minimum sensitivity of this modal group refers to the maximum sensitivity that can be obtained from the minimum value of the dynamic strain sensitivity of each order corresponding to the modal group tested by this strain gauge.

[0091] like Figure 4 As shown, another embodiment of the present application further provides a device for determining blade dynamic strain measurement points, comprising:

[0092] The finite element calculation module is used to calculate the blade mode using finite element software. The dynamic strain sensitivity of different nodes and directions of the blade is calculated based on the information of all finite element nodes at each order derived from the finite element calculation results.

[0093] The screening and searching module is used to screen and search the maximum value of the dynamic strain sensitivity from the dynamic strain sensitivities of different nodes and directions, and then obtain the optimal measurement point position and measurement direction of the blade dynamic strain and the minimum sensitivity of the modal group;

[0094] The cyclic calculation module is used to calculate the group sensitivity, optimal measurement point position and group optimal measurement direction of all modal groups, that is, to obtain the optimal measurement point position and measurement direction of all strain gauges and the minimum sensitivity of the modal group.

[0095] like Figure 5 As shown, a preferred embodiment of the present application also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the blade dynamic strain measurement point determination method in the above embodiment when executing the computer program.

[0096] like Figure 6 As shown, the preferred embodiment of the present application further provides a computer device, which can be a terminal or a liveness detection server, and its internal structure diagram can be as shown in FIG. Figure 6 As shown. The computer device includes a processor, a memory, and a network interface connected via a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer program in the non-volatile storage medium. The network interface of the computer device is used to communicate with other external computer devices via a network connection. When the computer program is executed by the processor, the steps of the above-mentioned blade dynamic strain measurement point determination method are implemented.

[0097] Those skilled in the art will understand that Figure 6The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0098] A preferred embodiment of the present application further provides a storage medium, which includes a stored program. When the program is executed, the device where the storage medium is located is controlled to execute the steps of the blade dynamic strain measurement point determination method in the above embodiment.

[0099] The method for determining blade dynamic strain measurement points provided in this application calculates the optimal blade dynamic strain measurement points, so that the dynamic strains of all key modes can be measured using a smaller number of strain gauge patches. The most important effect is to maximize the minimum value of the dynamic strain sensitivity in all modes measured.

[0100] The main application purpose of the blade dynamic strain measurement point determination method of the present invention is to use the strain gauge method to monitor the multi-modal dynamic strain state of the blade in the rotating state for the rotating machinery blade. The multi-modal dynamic strain to be monitored means that the blade has multiple modes of vibration during the rotating operation, and each mode of vibration corresponds to a different dynamic strain state.

[0101] This application can obtain preliminary modal order combinations (i.e., modal groupings) based on existing technologies, or it can list a variety of different modal combinations based on actual experience, and then use the method in this article for subsequent calculations.

[0102] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0103] If the functions described in the method of this embodiment are implemented in the form of a software functional unit and sold or used as an independent product, they can be stored in a storage medium readable by one or more computing devices. Based on this understanding, the part of the embodiment of this application that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes a number of instructions for enabling a computing device (which can be a personal computer, server, mobile computing device or network device, etc.) to execute all or part of the steps of the method described in each embodiment of this application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, and other media that can store program code.

[0104] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of a fully hardware embodiment, a fully software embodiment, or an embodiment combining software and hardware. Furthermore, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The solutions in the embodiments of the present application may be implemented in various computer languages, such as the object-oriented programming language Java and the interpreted scripting language JavaScript.

[0105] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0106] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0107] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0108] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0109] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A method for determining blade dynamic strain measurement points, characterized in that: Including steps: S1. Calculating blade modes using finite element software, and calculating dynamic strain sensitivities of different blade nodes at different angles based on information of all finite element nodes at each order derived from the finite element calculation results, specifically comprising the steps of: S11. Calculating blade modes using finite element software, deriving first and third principal strains, equivalent strains, and strain tensors of all finite element nodes at each order from the finite element calculation results, obtaining the strain tensor of the pasteable surface nodes and the largest first principal strain in the blade node results; S2, after screening and searching the maximum value of the dynamic strain sensitivity from the dynamic strain sensitivities of different nodes and different angles, obtain the optimal measuring point position and measuring direction of the blade dynamic strain of the corresponding strain gauge and the minimum sensitivity of the modal group, specifically including the steps of: S21, for the modal group G k , calculate all the pasteable surface nodes in the modal group G k The maximum sensitivity of each order, the maximum sensitivity value set is A, and the elements in A are: the calculated maximum sensitivity of node i at order j; S22, filter the pasteable surface nodes in step S21, and the nodes meet the conditions: their sensitivity of each order is greater than or equal to a%, where the value of a% is set according to the actual situation, and the remaining nodes are represented by set B; S23, according to the normal strain of each order of each node in set B at different angles, the point sensitivity and the optimal measurement direction of all nodes in set B are calculated; S24, the maximum value of the point sensitivity of all nodes is taken as the mode group G k The group sensitivity of the maximum value is the position of the point corresponding to the best measurement point, and the best measurement direction of the corresponding point is the modal group G. k The optimal measurement direction of the group, thus obtaining the strain gauge SG k The best measurement point location, minimum sensitivity of the modal group and the best measurement direction; S3. Calculate the group sensitivity, optimal measurement point position, and group optimal measurement direction of all modal groups, that is, obtain the optimal measurement point position and measurement direction of the blade dynamic strain of all strain gauges and the minimum sensitivity of the modal group.

2. The method for determining blade dynamic strain measurement points according to claim 1, characterized in that: The step S23 specifically includes the following steps: S231. For a node in set B, traverse and calculate the normal strains of each order of the node in different angle directions, calculate the minimum sensitivity of all modes at each angle as the angle sensitivity, and obtain the angle sensitivity of all angles; S232. Search for the maximum value of the sensitivity of a node in the set B at all angles as the point sensitivity of the node, and the angle corresponding to the point sensitivity is the optimal measurement direction of the node; S233 , according to step S231 to step S232 , calculate and obtain the point sensitivity and the point optimal measurement direction of all nodes in set B.

3. The method for determining blade dynamic strain measurement points according to claim 1, characterized in that: In step S21, the maximum sensitivity of the i-th node at order j is calculated as follows: Where: (x, y, z) is the coordinate position of the measuring point, (l, m, n) is the test direction of the strain gauge patch, η j is the sensitivity of the strain gauge in the jth mode; is the strain value monitored by the strain gauge at the (x, y, z) coordinate position in the (l, m, n) direction, obtained by finite element calculation; is the maximum modal strain value under the j-th mode, where the maximum modal strain value is the maximum value of the first principal strain, third principal strain or equivalent strain of all nodes on the blade surface.

4. The method for determining blade dynamic strain measurement points according to claim 1, characterized in that: In step S22, a% is set to 30%.

5. A device for determining blade dynamic strain measurement points, characterized in that: include: The finite element calculation module is used to calculate the blade mode using the finite element software, and calculate the dynamic strain sensitivity of different nodes of the blade in different angular directions based on the information of all finite element nodes at each order derived from the finite element calculation results. Specifically, it is used to: calculate the blade mode using the finite element software, derive the first and third principal strains, equivalent strains and strain tensors of all finite element nodes at each order from the finite element calculation results, obtain the strain tensor of the pasteable surface nodes, and the largest first principal strain in the blade node results; The screening and searching module is used to screen and search the maximum value of dynamic strain sensitivity from the dynamic strain sensitivity of different nodes and different angles to obtain the optimal measuring point position and measurement direction of blade dynamic strain and the minimum sensitivity of the modal group. It is specifically used for: k , calculate all the pasteable surface nodes in the modal group G k The maximum sensitivity of each order is the maximum sensitivity of the maximum sensitivity value set A, and the elements in A are: the maximum sensitivity of the calculated node i at order j; the nodes that can be pasted are screened, and the nodes meet the conditions: their sensitivity of each order is greater than or equal to a%, where the value of a% is set according to the actual situation, and the remaining nodes are represented by set B; the point sensitivity and the optimal measurement direction of all nodes in set B are calculated according to the normal strain of each order of each node in set B at different angles; the maximum value of the point sensitivity of all nodes is taken as the mode group G k The group sensitivity of the maximum value is the position of the point corresponding to the best measurement point, and the best measurement direction of the corresponding point is the modal group G. k The optimal measurement direction of the group, thus obtaining the strain gauge SG k The best measurement point location, minimum sensitivity of the modal group and the best measurement direction; The cyclic calculation module is used to calculate the group sensitivity, optimal measurement point position and group optimal measurement direction of all modal groups, that is, to obtain the optimal measurement point position and measurement direction of all strain gauges and the minimum sensitivity of the modal group.

6. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the steps of the method for determining blade dynamic strain measurement points according to any one of claims 1 to 4 are implemented.

7. A storage medium comprising a stored program, which controls a device where the storage medium is located to execute the steps of the method for determining blade dynamic strain measurement points according to any one of claims 1 to 4 when the program is executed.

8. A computer program product comprising a computer program or computer executable instructions, characterized in that When the computer program or computer executable instructions are executed by a processor, the steps of the method for determining blade dynamic strain measurement points according to any one of claims 1 to 4 are implemented.

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