Design method and system for dynamic stress measurement patch of thin-walled stator structure with lobe integral ring

Abstract

The invention relates to the technical field of structural dynamic stress measurement, and discloses a dynamic stress measurement patch design method and system for a thin-walled stator structure with a lobe integral ring. According to structural geometric features, modal characteristics, excitation sources and crack positions of the thin-walled stator structure with a lobe integral ring, the equivalent vibration stress of all surface nodes of the thin-walled stator structure with a lobe integral ring is fully considered, and the node with the largest equivalent vibration stress is determined as the patch point of the strain gauge. The pasting position of the strain gauge can be quickly determined, and the influence law of the wake area and non-wake area of ​​the support plate on the dynamic stress of the stator structure can be obtained, which not only improves the test efficiency, but also ensures the effectiveness of the test. The designed strain gauge can be used to obtain the dynamic stress characteristics of the thin-walled stator structure with a lobe integral ring, and data support is provided for the high-cycle fatigue resistance design of the thin-walled stator structure with a lobe integral ring.

Description

Technical Field

[0001] The invention relates to the technical field of structural dynamic stress measurement, and discloses a design method and a system for a dynamic stress measurement patch of a thin-walled stator structure with a complete ring of lobes. Background Art

[0002] In order to improve the thrust-to-weight ratio, aircraft engines often use a thin-walled stator structure with a complete ring of lobes (such as Figure 2 As shown in the figure, the structure is exposed to high temperature, high pressure and high speed airflow. On the one hand, the arc lobe structure is used to absorb thermal deformation and reduce thermal stress; on the other hand, the arc lobe structure has low rigidity and is easily stimulated by airflow to cause abnormal vibration and high cycle fatigue cracks. In order to find out the vibration frequency and dynamic stress level of these thin-walled stator structures with lobe rings, it is necessary to paste strain gauges to conduct dynamic stress measurement tests.

[0003] At present, dynamic stress measurement technology is mainly used in blades. Its patch design method is very mature and has relatively high measurement accuracy. It plays an important role in the high-cycle fatigue design of blades. As the vibration problem of the whole-ring thin-walled stator structure becomes increasingly prominent, the demand for applying dynamic stress measurement technology to the whole-ring thin-walled stator structure with lobes is becoming more and more urgent. However, the excitation source of the vibration of the whole-ring thin-walled stator structure is different from that of the blade. In addition, its structural geometric characteristics are far from those of the blade, and the vibration mode is more complex. Therefore, the patch design method of the whole-ring thin-walled stator structure with lobes cannot completely copy the design method of the blade. Summary of the invention

[0004] The purpose of the present invention is to provide a design method and system for a dynamic stress measurement patch for a thin-walled stator structure with a complete lobe ring, which can quickly determine the strain gauge pasting position and obtain the influence of the support plate wake area and non-wake area on the dynamic stress of the stator structure, thereby improving the test efficiency and ensuring the effectiveness of the test. The designed strain gauge can be used to obtain the dynamic stress characteristics of the thin-walled stator structure with a complete lobe ring.

[0005] In order to achieve the above technical effects, the technical solution adopted by the present invention is:

[0006] A method for designing a dynamic stress measurement patch for a thin-walled stator structure with a lobe integral ring, wherein the thin-walled stator structure with a lobe integral ring comprises a plurality of arc-shaped lobes protruding toward the inner side of a stator casing, wherein the plurality of arc-shaped lobes are uniformly distributed in an annular direction, and two adjacent arc-shaped lobes are connected by an arc segment to form the thin-walled stator structure with a lobe integral ring; the method for designing a dynamic stress measurement patch comprises:

[0007] According to the number of arc lobes in the thin-walled stator structure with a complete ring of lobes, the thin-walled stator structure with a complete ring of lobes is divided into a plurality of structural units with central symmetry distribution, and a finite element simulation analysis method is used to obtain the relative vibration equivalent stress of each node on the structural unit at different orders under the assessment condition;

[0008] The equivalent vibration stress of the surface nodes of the structural unit is obtained according to the relative vibration equivalent stress analysis of each node at different orders, and the node with the largest equivalent vibration stress is determined as the patch point of the strain gauge on the structural unit;

[0009] The number of strain gauges is determined according to the number of arc-shaped lobes in the thin-walled stator structure with lobes and the number of support plates at the front end of the stator casing; and the circumferential distribution positions of the strain gauges are determined according to the number of strain gauges, wherein the circumferential distribution positions of the strain gauges include patch points directly behind the support plates and patch points between adjacent support plates;

[0010] The intersection of the engine axis and the engine intake edge is taken as the origin, the engine axis along the airflow direction is the positive direction of the Y axis, and the straight line passing through the origin O on the engine symmetry plane and perpendicular to the Y axis is the X-axis plane rectangular coordinate system; the angle between the maximum vibration principal stress direction vector of the patch point and the X axis is determined as the sticking angle of the strain gauge in the XOY plane.

[0011] Furthermore, the method for determining the number and circumferential distribution positions of strain gauges includes:

[0012] Calculate the characteristic value of the number of strain gauges based on the number of arc lobes and the number of support plates ,in is the characteristic value of the number of strain gauges, is the number of arc lobes in the thin-walled stator structure with a complete ring of lobes, is the number of support plates, is the floor rounding function;

[0013] Determine the number of strain gauges based on the relationship between the quantity characteristic value and the number of support plates ; When the number of strain gauges is When A strain gauge is set at the patch point directly behind the support plate. strain gauges are set at the patch points between adjacent support plates; the number of strain gauges is When the back of the support plate and between the adjacent support plates are patch points; the number of strain gauges is When a strain gauge is set at a patch point position on each of the structural units.

[0014] Furthermore, the method for obtaining the equivalent vibration stress of all surface nodes of the structural unit according to the relative vibration equivalent stress analysis of each node at different orders includes:

[0015] According to the formula Calculate the equivalent vibration stresses at all surface nodes ,in For the corresponding node Level Relative vibration equivalent stress of pitch diameter vibration, is the number of test orders.

[0016] Furthermore, the pasting angle of the strain gauge at the corresponding patch point ,in is the direction vector of the maximum vibration principal stress at the corresponding patch point, is the unit vector of the X axis.

[0017] In order to achieve the above technical effects, the present invention also provides a patch design system for measuring dynamic stress of a thin-walled stator structure with a complete ring of lobes, which is used to implement the patch design method for measuring dynamic stress of a thin-walled stator structure with a complete ring of lobes; comprising:

[0018] A simulation analysis module is used to divide the thin-walled stator structure with a lobe integral ring into a plurality of structural units with central symmetry distribution according to the number of arc lobes in the thin-walled stator structure with a lobe integral ring, and to obtain the relative vibration equivalent stress of each node on the structural unit at different orders under the assessment working condition by using a finite element simulation analysis method;

[0019] A patch point determination module is used to obtain the equivalent vibration stress of the surface nodes of the structural unit according to the relative vibration equivalent stress analysis of each node at different orders, and determine the node with the largest equivalent vibration stress as the patch point of the strain gauge on the structural unit;

[0020] A quantity analysis module is used to determine the number of strain gauges according to the number of arc-shaped lobes in the thin-walled stator structure with lobes and the number of support plates at the front end of the stator casing; and to determine the circumferential distribution positions of the strain gauges according to the number of strain gauges, wherein the circumferential distribution positions of the strain gauges include patch points directly behind the support plates and patch points between adjacent support plates;

[0021] The patch angle determination module is used to take the intersection of the engine axis and the engine intake edge as the origin, the engine axis along the airflow direction as the positive direction of the Y axis, and the straight line passing through the origin O on the engine symmetry plane and perpendicular to the Y axis as the X-axis plane rectangular coordinate system; determine the angle between the maximum vibration principal stress direction vector of the patch point and the X axis as the pasting angle of the strain gauge in the XOY plane.

[0022] Furthermore, in the quantity analysis module, the method for determining the number and circumferential distribution positions of strain gauges includes:

[0023] Calculate the characteristic value of the number of strain gauges based on the number of arc lobes and the number of support plates ,in is the characteristic value of the number of strain gauges, is the number of arc lobes in the thin-walled stator structure with a complete ring of lobes, is the number of support plates, is the floor rounding function;

[0024] Determine the number of strain gauges based on the relationship between the quantity characteristic value and the number of support plates ; When the number of strain gauges is When A strain gauge is set at the patch point directly behind the support plate. strain gauges are set at the patch points between adjacent support plates; the number of strain gauges is When the back of the support plate and between the adjacent support plates are patch points; the number of strain gauges is When a strain gauge is set at a patch point position on each of the structural units.

[0025] Furthermore, in the patch point determination module, according to the formula Calculate the equivalent vibration stresses at all surface nodes ,in For the corresponding node Level Relative vibration equivalent stress of pitch diameter vibration, is the number of test orders.

[0026] Furthermore, in the patch angle determination module, according to The pasting angle of the strain gauge at the patch point is obtained by analysis, where is the direction vector of the maximum vibration principal stress at the corresponding patch point, is the unit vector of the X axis.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention fully considers the equivalent vibration stress of all surface nodes of the thin-walled stator structure with a lobe integral ring according to the structural geometric characteristics, modal characteristics, excitation sources and crack locations, and determines the nodes with the largest equivalent vibration stress as the patching points of the strain gauges. The strain gauge pasting positions can be quickly determined, and the influence of the support plate wake area and non-wake area on the dynamic stress of the stator structure can be obtained, which not only improves the test efficiency, but also ensures the effectiveness of the test. The designed strain gauges can be used to obtain the dynamic stress characteristics of the thin-walled stator structure with a lobe integral ring, providing data support for the high-cycle fatigue resistance design of the thin-walled stator structure with a lobe integral ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A flow chart of a method for designing a dynamic stress measurement patch for a thin-walled stator structure with a complete ring of lobes in Example 1 or 2;

[0029] Figure 2 It is a schematic cross-sectional view of a thin-walled stator structure with a complete ring of lobes in Embodiment 1 or 2;

[0030] Figure 3 This is a schematic diagram of the projection structure of the thin-walled stator structure with a complete ring of lobes on the symmetric plane of the engine in Example 2;

[0031] Figure 4 This is a structural block diagram of the system design of a dynamic stress measurement patch for a thin-walled stator structure with a complete ring of lobes in Example 1;

[0032] Among them, 1. arc lobe; 2. arc segment; 3. support plate; 4. simulation analysis module; 5. patch point determination module; 6. quantity analysis module; 7. patch angle determination module; 8. air intake edge; 9. strain gauge. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the embodiments and drawings. However, it should not be understood that the scope of the above subject matter of the present invention is limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0034] Example 1

[0035] See also Figure 1 , Figure 2 and Figure 4 , a design method for a dynamic stress measurement patch of a thin-walled stator structure with a lobe ring, wherein the thin-walled stator structure with a lobe ring includes a plurality of arc lobes 1 protruding toward the inner side of the stator casing, the plurality of arc lobes 1 are evenly distributed in the circumferential direction, and two adjacent arc lobes 1 are connected by an arc segment 2 to form the thin-walled stator structure with a lobe ring; the design method for the dynamic stress measurement patch includes:

[0036] According to the number of arc lobes 1 in the thin-walled stator structure with a lobe full ring, the thin-walled stator structure with a lobe full ring is divided into a plurality of structural units with central symmetry distribution, and a finite element simulation analysis method is used to obtain the relative vibration equivalent stress of each node on the structural unit at different orders under the assessment working condition;

[0037] The equivalent vibration stress of the surface nodes of the structural unit is obtained according to the relative vibration equivalent stress analysis of each node at different orders, and the node with the largest equivalent vibration stress is determined as the patch point of the strain gauge 9 on the structural unit;

[0038] The number of strain gauges 9 is determined according to the number of arc-shaped lobes 1 in the thin-walled stator structure with lobes and the number of support plates 3 at the front end of the stator casing; and the circumferential distribution positions of the strain gauges 9 are determined according to the number of strain gauges 9, and the circumferential distribution positions of the strain gauges 9 include patch points directly behind the support plates 3 and patch points between adjacent support plates 3;

[0039] The intersection of the engine axis and the engine intake edge 8 is taken as the origin, the engine axis along the airflow direction is the positive direction of the Y axis, and the straight line passing through the origin O on the engine symmetry plane and perpendicular to the Y axis is the X-axis plane rectangular coordinate system; the angle between the maximum vibration principal stress direction vector of the patch point and the X axis is determined as the pasting angle of the strain gauge 9 in the XOY plane.

[0040] In this embodiment, according to the structural geometric characteristics, modal characteristics, excitation sources and crack locations of the thin-walled stator structure with a lobe integral ring, the equivalent vibration stress of all surface nodes of the thin-walled stator structure with a lobe integral ring is fully considered, and the node with the largest equivalent vibration stress is determined as the patch point of the strain gauge 9. The pasting position of the strain gauge 9 can be quickly determined, and the influence of the wake area and non-wake area of ​​the support plate 3 on the dynamic stress of the stator structure can be obtained, which not only improves the test efficiency, but also ensures the effectiveness of the test. The designed strain gauge 9 can be used to obtain the dynamic stress characteristics of the thin-walled stator structure with a lobe integral ring, providing data support for the high-cycle fatigue design of the thin-walled stator structure with a lobe integral ring.

[0041] Based on the same inventive concept, this embodiment also provides a dynamic stress measurement patch design system for a thin-walled stator structure with a lobe integral ring, including:

[0042] A simulation analysis module 4 is used to divide the thin-walled stator structure with a lobe full ring into a plurality of structural units with central symmetry distribution according to the number of arc lobes 1 in the thin-walled stator structure with a lobe full ring, and to obtain the relative vibration equivalent stress of each node on the structural unit at different orders under the assessment working condition by using a finite element simulation analysis method;

[0043] The patch point determination module 5 is used to obtain the equivalent vibration stress of the surface nodes of the structural unit according to the relative vibration equivalent stress analysis of each node at different orders, and determine the node with the largest equivalent vibration stress as the patch point of the strain gauge 9 on the structural unit;

[0044] The quantity analysis module 6 is used to determine the number of strain gauges 9 according to the number of arc-shaped lobes 1 in the thin-walled stator structure with lobes and the number of support plates 3 at the front end of the stator casing; and determine the circumferential distribution position of the strain gauges 9 according to the number of strain gauges 9, wherein the circumferential distribution position of the strain gauges 9 includes the patch points directly behind the support plates 3 and the patch points between adjacent support plates 3;

[0045] The patch angle determination module 7 is used to take the intersection of the engine axis and the engine intake edge 8 as the origin, the engine axis along the airflow direction as the positive direction of the Y axis, and the straight line passing through the origin O and perpendicular to the Y axis on the engine symmetry plane as the X-axis plane rectangular coordinate system; determine the angle between the maximum vibration principal stress direction vector of the patch point and the X axis as the pasting angle of the strain gauge 9 in the XOY plane.

[0046] Example 2

[0047] See also Figure 1-Figure 3 , a method for designing a dynamic stress measurement patch for a thin-walled stator structure with a lobe ring, wherein the thin-walled stator structure with a lobe ring includes a plurality of arc lobes 1 protruding toward the inner side of the stator casing, wherein the plurality of arc lobes 1 are evenly distributed in the circumferential direction, and two adjacent arc lobes 1 are connected by an arc segment 2 to form the thin-walled stator structure with a lobe ring; the operation steps are as follows:

[0048] Step 1: according to the number of arc lobes 1 in the thin-walled stator structure with a lobe integral ring, the thin-walled stator structure with a lobe integral ring is divided into a plurality of structural units with central symmetry distribution, and a finite element simulation analysis method is used to obtain the relative vibration equivalent stress of each node on the structural unit at different orders under the assessment working condition;

[0049] In this embodiment, modal calculations under test conditions are performed based on finite elements to obtain relative vibration equivalent stresses of nodal diameter vibrations of structural units at different orders.

[0050] Step 2: Obtain the equivalent vibration stress of the surface nodes of the structural unit according to the relative vibration equivalent stress analysis of each node at different orders, and determine the node with the largest equivalent vibration stress as the patch point of the strain gauge 9 on the structural unit;

[0051] In this embodiment, according to the formula Calculate the equivalent vibration stresses at all surface nodes ,in For the corresponding node Level Relative vibration equivalent stress of pitch diameter vibration, is the number of test orders. In the actual application of this embodiment, the equivalent stress is not calculated at the nodes within 5mm of the hole edge and the chamfered surface. Find the node with the largest stress among the nodes, and this point is the patch point.

[0052] Step 3: Determine the number of strain gauges 9 according to the number of arc-shaped lobes 1 in the thin-walled stator structure with lobes and the number of support plates 3 at the front end of the stator casing; and determine the circumferential distribution positions of the strain gauges 9 according to the number of strain gauges 9, wherein the circumferential distribution positions of the strain gauges 9 include the patch points directly behind the support plates 3 and the patch points between the adjacent support plates 3.

[0053] In this embodiment, the number characteristic value of the strain gauge 9 is first calculated according to the number of arc-shaped lobes 1 and the number of support plates 3. , ,in is the quantitative characteristic value of strain gauge 9, is the number of arc lobes 1 in the thin-walled stator structure with a complete ring of lobes, is the number of support plates 3, is the floor function.

[0054] Then, the number of strain gauges 9 is determined based on the relationship between the number characteristic value and the number of support plates 3. ; When the number of strain gauges 9 is When A strain gauge 9 is set at the patch point directly behind the support plate 3. The strain gauges 9 are arranged at the patch points between the adjacent support plates 3; the number of the strain gauges 9 is When the back of the support plate 3 and the adjacent support plates 3 are patch points; the number of strain gauges 9 is When the patch point position on each structural unit is set with a strain gauge 9. The position design of the strain gauge 9 can make the position of the strain gauge 9 cover the position directly behind and not directly behind the support plate 3, meet the dynamic stress measurement requirements of the thin-walled stator structure with a complete ring of lobes, and ensure that the data can reflect the influence of the support plate on the dynamic stress.

[0055] As in this embodiment, the lobes of the thin-walled stator casing with a complete ring of lobes can be numbered first, such as Figure 2 As shown, starting from 12 o'clock, the lobes are numbered in a clockwise direction, with a total of 10 arc lobes 1, support plate 3, and is 3, then the number characteristic value of strain gauge 9 is is 3; because , so the total number of strain gauges 9 is , that is, 9 strain gauges 9. In this embodiment, 6 of the strain gauges 9 are installed on the patch points directly behind the support plate 3, and the corresponding numbers are: 01#, 04#, 05#, 07#, 08#, 10#; the remaining 3 strain gauges 9 are set on the patch points between adjacent support plates 3, and the corresponding numbers are: 03#, 06#, 09#.

[0056] Step 4: Take the intersection of the engine axis and the engine intake edge 8 as the origin, the engine axis along the airflow direction as the positive direction of the Y axis, and the straight line passing through the origin O and perpendicular to the Y axis on the engine symmetry plane as the X-axis plane rectangular coordinate system; determine the angle between the maximum vibration principal stress direction vector of the patch point and the X axis as the pasting angle of the strain gauge 9 in the XOY plane. In this embodiment, according to The pasting angle of the strain gauge 9 at the patch point is obtained by analysis, where is the direction vector of the maximum vibration principal stress at the corresponding patch point, is the unit vector of the X axis.

[0057] In this embodiment, based on the XOY plane coordinate system, the right-hand rule is used to establish the spatial rectangular coordinate system O-XYZ, and the node A with the largest vibration principal stress is selected. As the patch point. The method for determining the specific position of patch point A is: the distance between patch point A and the air inlet edge 8 is , the distance between patch point A and the engine axis is Method for determining the pasting direction of strain gauge 9: Calculate the vibration principal stress direction vector of the pasting point A , projecting the vector onto the engine symmetry plane to form a direction vector ,make , then according to Calculate the patch angle at patch point A.

[0058] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. 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 present invention.

Claims

1. A method for designing a dynamic stress measurement patch for a thin-walled stator structure with a complete ring of lobes, wherein the thin-walled stator structure with a complete ring of lobes comprises a plurality of arc-shaped lobes protruding toward the inner side of a stator casing, wherein the plurality of arc-shaped lobes are evenly distributed in an annular direction, and two adjacent arc-shaped lobes are connected by an arc segment to form the thin-walled stator structure with a complete ring of lobes; characterized in that: The dynamic stress measurement patch design method comprises: According to the number of arc lobes in the thin-walled stator structure with a complete ring of lobes, the thin-walled stator structure with a complete ring of lobes is divided into a plurality of structural units with central symmetry distribution, and a finite element simulation analysis method is used to obtain the relative vibration equivalent stress of each node on the structural unit at different orders under the assessment condition; The equivalent vibration stress of the surface nodes of the structural unit is obtained according to the relative vibration equivalent stress analysis of each node at different orders, and the node with the largest equivalent vibration stress is determined as the patch point of the strain gauge on the structural unit; The number of strain gauges is determined according to the number of arc-shaped lobes in the thin-walled stator structure with lobes and the number of support plates at the front end of the stator casing; and the circumferential distribution position of the strain gauge is determined according to the number of strain gauges, and the circumferential distribution position of the strain gauge includes the patch point directly behind the support plate and the patch point between adjacent support plates; wherein, the method for determining the number and circumferential distribution position of the strain gauge includes: Calculate the characteristic value of the number of strain gauges based on the number of arc lobes and the number of support plates , is the characteristic value of the number of strain gauges, is the number of arc lobes in the thin-walled stator structure with a complete ring of lobes, is the number of support plates, is the floor rounding function; Determine the number of strain gauges based on the relationship between the quantity characteristic value and the number of support plates ; When the number of strain gauges is When A strain gauge is set at the patch point directly behind the support plate. strain gauges are set at the patch points between adjacent support plates; the number of strain gauges is When the back of the support plate and between the adjacent support plates are patch points; the number of strain gauges is When , a strain gauge is set at each patch point position on the structural unit; The intersection of the engine axis and the engine intake edge is taken as the origin, the engine axis along the airflow direction is the positive direction of the Y axis, and the straight line passing through the origin O on the engine symmetry plane and perpendicular to the Y axis is the X-axis plane rectangular coordinate system; the angle between the maximum vibration principal stress direction vector of the patch point and the X axis is determined as the sticking angle of the strain gauge in the XOY plane.

2. The design method of the dynamic stress measurement patch of the thin-walled stator structure with a lobe integral ring according to claim 1 is characterized in that: The method for obtaining the equivalent vibration stress of all surface nodes of the structural unit according to the relative vibration equivalent stress analysis of each node at different orders includes: According to the formula Calculate the equivalent vibration stresses at all surface nodes ,in For the corresponding node Level Relative vibration equivalent stress of pitch diameter vibration, is the number of test orders.

3. The design method of the dynamic stress measurement patch of the thin-walled stator structure with a lobe integral ring according to claim 2 is characterized in that: Corresponding to the pasting angle of the strain gauge on the patch point ,in is the direction vector of the maximum vibration principal stress at the corresponding patch point, is the unit vector of the X axis.

4. A system for designing dynamic stress measurement patches for thin-walled stator structures with complete lobes, used to implement the method for designing dynamic stress measurement patches for thin-walled stator structures with complete lobes as claimed in claim 1; characterized in that: include: A simulation analysis module is used to divide the thin-walled stator structure with a lobe integral ring into a plurality of structural units with central symmetry distribution according to the number of arc lobes in the thin-walled stator structure with a lobe integral ring, and to obtain the relative vibration equivalent stress of each node on the structural unit at different orders under the assessment working condition by using a finite element simulation analysis method; A patch point determination module is used to obtain the equivalent vibration stress of the surface nodes of the structural unit according to the relative vibration equivalent stress analysis of each node at different orders, and determine the node with the largest equivalent vibration stress as the patch point of the strain gauge on the structural unit; The quantity analysis module is used to determine the number of strain gauges according to the number of arc lobes in the thin-walled stator structure with lobes and the number of support plates at the front end of the stator casing; and determine the circumferential distribution position of the strain gauge according to the number of strain gauges, wherein the circumferential distribution position of the strain gauge includes the patch point directly behind the support plate and the patch point between adjacent support plates; wherein the method for determining the number and circumferential distribution position of the strain gauges includes: Calculate the characteristic value of the number of strain gauges based on the number of arc lobes and the number of support plates , is the characteristic value of the number of strain gauges, is the number of arc lobes in the thin-walled stator structure with a complete ring of lobes, is the number of support plates, is the floor rounding function; Determine the number of strain gauges based on the relationship between the quantity characteristic value and the number of support plates ; When the number of strain gauges is When A strain gauge is set at the patch point directly behind the support plate. strain gauges are set at the patch points between adjacent support plates; the number of strain gauges is When the back of the support plate and between the adjacent support plates are patch points; the number of strain gauges is When , a strain gauge is set at each patch point position on the structural unit; The patch angle determination module is used to take the intersection of the engine axis and the engine intake edge as the origin, the engine axis along the airflow direction as the positive direction of the Y axis, and the straight line passing through the origin O on the engine symmetry plane and perpendicular to the Y axis as the X-axis plane rectangular coordinate system; determine the angle between the maximum vibration principal stress direction vector of the patch point and the X axis as the pasting angle of the strain gauge in the XOY plane.

5. The dynamic stress measurement patch design system for thin-walled stator structure with lobe integral ring according to claim 4 is characterized in that: In the patch point determination module, according to the formula Calculate the equivalent vibration stresses at all surface nodes ,in For the corresponding node Level Relative vibration equivalent stress of pitch diameter vibration, is the number of test orders.

6. The dynamic stress measurement patch design system for thin-walled stator structure with lobe integral ring according to claim 5 is characterized in that: In the patch angle determination module, according to The pasting angle of the strain gauge at the patch point is obtained by analysis, where is the direction vector of the maximum vibration principal stress at the corresponding patch point, is the unit vector of the X axis.

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