Membrane disc coupling simulation piece and design method thereof

Abstract

The invention relates to the technical field of fatigue strength tests of moving parts, and discloses a membrane disc coupling simulation piece and a design method thereof, and the membrane disc coupling simulation piece comprises a membrane disc which comprises a central part and an edge part which are connected with each other; the center part is in a circular ring shape, the edge part extends around the whole circumference of the center part, and a plurality of connecting holes are formed in the circumferential direction of the edge part at intervals; the connecting shaft comprises a connecting part and a clamping part which are connected with each other; the connecting part is connected to the middle of the center part, and the clamping part is located on one axial side of the center part. According to the membrane disc coupling simulation piece and the design method thereof, the test cost is reduced, the test process is simplified, the operation is simple, the test scheme is mature and reliable, and the economical efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of fatigue strength testing of moving parts, and in particular to a diaphragm disc coupling simulation component and a design method thereof. Background Art

[0002] The diaphragm coupling structure is a mechanical component used to connect shafts and rotate with the shaft during the transmission process. Its main function is to realize the transmission of motion and power between different shafts or parts. It is a high-performance flexible coupling. The main form of diaphragm coupling structure is fatigue failure. Therefore, fatigue strength testing of diaphragm coupling structure is crucial to the practical application of diaphragm coupling structure. However, fatigue testing using real diaphragm coupling structural parts is costly, and the test method is complicated and difficult to operate. Summary of the invention

[0003] In view of this, the present invention provides a diaphragm coupling simulation component and a design method thereof to solve the problems of high cost, complex test method and difficult operation of fatigue strength test of diaphragm coupling structure.

[0004] In the first aspect, the present invention provides a diaphragm disk coupling simulation component, comprising: a diaphragm disk, comprising a central portion and an edge portion connected to each other; the central portion is in a circular ring shape, the edge portion extends around the entire circumference of the central portion, and the edge portion is provided with a plurality of connecting holes at circumferential intervals; a connecting shaft, comprising a connecting portion and a clamping portion connected to each other; the connecting portion is connected to the middle portion of the central portion, and the clamping portion is located on one axial side of the central portion.

[0005] In an optional embodiment, both axial sides of the central portion are recessed in the edge portion; along the axial direction of the central portion, at least a portion of the structure of the connecting portion protrudes from a side of the central portion away from the clamping portion.

[0006] In an optional embodiment, the membrane disk also includes a first transition portion and a second transition portion; the first transition portion is connected between the center portion and the edge portion, and the second transition portion is connected between the center portion and the connecting portion; the second transition portion is provided with an annular protrusion extending around the axis, and the annular protrusion is located on the side of the second transition portion away from the clamping portion.

[0007] In an optional embodiment, the diaphragm coupling simulation component further includes a first fastener, a threaded section is provided on the clamping portion, and the first fastener is threadedly connected to the threaded section.

[0008] In an optional embodiment, the diaphragm disc coupling simulation component further includes a plurality of second fasteners, and the plurality of second fasteners are respectively inserted into the plurality of connecting holes, and the second fasteners are used to fix the diaphragm disc coupling simulation component to the external structure.

[0009] In the second aspect, the present invention also provides a design method for a diaphragm disc coupling simulation component, which is used to obtain a diaphragm disc coupling simulation component as described above, comprising the following steps: Step 1: Determine the structural characteristics of the test component, and determine the load conditions of the test component under actual working conditions; Step 2: According to the structural characteristics of the test component and the load conditions under actual working conditions, establish a three-dimensional model and a finite element model of an initial diaphragm disc coupling simulation component including the structural characteristics of the test component, and use a linear elastic constitutive model to calculate and obtain the stress field of the initial diaphragm disc coupling simulation component under the actual working load; Step 3: Compare the stress field of the initial diaphragm disc coupling simulation component under the actual working load with the stress state of the test component under the actual working condition, and judge whether the initial diaphragm disc coupling simulation component is Whether it meets the design requirements; if not, optimize the characteristic structure of the initial diaphragm coupling simulation until it meets the requirements; Step 4: After completing step 3, design the clamping structure based on the final initial diaphragm coupling simulation to obtain the three-dimensional model of the diaphragm coupling simulation; Step 5: Establish a finite element model based on the three-dimensional model of the diaphragm coupling simulation, obtain the stress field of the diaphragm coupling simulation under the actual working load, and compare it with the stress state of the test piece under the actual working condition to ensure that all parts of the diaphragm coupling simulation can meet the test requirements; Step 6: After completing step 5, obtain the diaphragm coupling simulation based on the final three-dimensional model of the diaphragm coupling simulation and the structural characteristics of the test piece.

[0010] In an optional embodiment, in step 1, the structural characteristics of the test piece include the geometric shape, size, material parameters, cold and hot processing technology, heat treatment status and surface roughness of the test piece; the load conditions of the test piece under actual working conditions include the environmental conditions, load size and load type of the test piece under actual service conditions.

[0011] In an optional embodiment, in step 2, based on the stress field identification of the initial diaphragm disc coupling simulation under the actual working load: the deformation mode of the initial diaphragm disc coupling simulation including the structural feature part of the test piece; the dangerous parts of the initial diaphragm disc coupling simulation, the dangerous parts refer to the maximum principal stress position; the geometric characteristics of the dangerous parts; the maximum principal stress distribution of the dangerous parts; the stress distribution condition at the diaphragm of the initial diaphragm disc coupling simulation.

[0012] In an optional embodiment, in step 3, it also includes: determining the working load type and basic mechanical model of the initial diaphragm disk coupling simulation component, and optimizing the initial diaphragm disk coupling simulation component according to the determined working load type and basic mechanical model.

[0013] In an optional embodiment, before step 6, the step is also included: determining the test load of the diaphragm disc coupling simulation, the test load includes determining the maximum test load and the minimum test load; wherein, the loading load is determined by finite element calculation, and the local maximum principal stress of the diaphragm disc coupling simulation is made equal to the maximum principal stress of the dangerous part by adjusting the load size in the finite element to obtain the test maximum load of the diaphragm disc coupling simulation; and the local minimum stress of the diaphragm disc coupling simulation is calculated according to the local stress ratio of the test piece, and the test minimum load of the diaphragm disc coupling simulation is determined in combination with the finite element calculation method.

[0014] By using the technical solution of the present invention, the diaphragm coupling simulation includes a diaphragm and a connecting shaft, which includes the real structural features of the diaphragm coupling structure. By using the diaphragm coupling simulation to replace the real diaphragm coupling structure for fatigue strength testing, the test cost is reduced and the economic efficiency is improved. In addition, this solution uses the connection hole on the diaphragm and the clamping part on the connecting shaft to clamp to the test equipment, converting the torsion and angular offset loads of the diaphragm coupling structure during service into uniaxial tensile loads, simplifying the test process, making the operation simple, and the test scheme mature and reliable, further improving the economic efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a front view of a membrane disc coupling simulation component according to an embodiment of the present invention;

[0017] Figure 2 for Figure 1 Section view of AA in the middle;

[0018] Figure 3 for Figure 2 A partial enlarged view of middle I;

[0019] Figure 4 A top view of a membrane disc coupling simulation component according to an embodiment of the present invention;

[0020] Figure 5 A process flow chart of a design method of a diaphragm coupling simulation component according to an embodiment of the present invention;

[0021] Figure 6 A three-dimensional model diagram of a membrane disc coupling simulation component according to an embodiment of the present invention;

[0022] Figure 7 A stress distribution cloud diagram of a diaphragm disk coupling simulation component according to an embodiment of the present invention.

[0023] Description of reference numerals:

[0024] 1. membrane disc; 11. center portion; 12. edge portion; 13. connection hole; 14. first transition portion; 15. second transition portion; 151. annular convex portion;

[0025] 2. Connecting shaft; 21. Connecting portion; 22. Clamping portion; 221. Threaded section. DETAILED DESCRIPTION

[0026] 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 those skilled in the art without creative work are within the scope of protection of the present invention.

[0027] The diaphragm coupling structure is a mechanical component used to connect shafts and rotate with the shaft during the transmission process. Its main function is to realize the transmission of motion and power between different shafts or parts. The diaphragm coupling structure can not only enhance the flexibility of the machine, allowing a small axial deviation and angular deviation of the connecting shaft to a certain extent, but also improve the vibration characteristics of the rotating element, play a role in buffering and vibration isolation, and is a high-performance flexible coupling. The diaphragm coupling structure has the advantages of no need for lubrication, no maintenance, strong ability to withstand offset, simple structure, light weight, and long service life. At the same time, it also combines the characteristics of high speed, high power, and large deflection. It is widely used in aviation, shipbuilding and other fields.

[0028] As a flexible coupling, the diaphragm in the diaphragm coupling structure bears periodic loads, and the main form of its structural failure is fatigue failure. Therefore, fatigue strength research is the main part of the diaphragm coupling structural strength research. However, the cost of fatigue testing using real diaphragm coupling structural parts is high, and the test method is complex and difficult to operate.

[0029] Based on this, the present invention provides a diaphragm disc coupling simulation component and a design method thereof to solve the problems of high cost, complex test method and difficult operation of fatigue strength test of diaphragm disc coupling structure.

[0030] Combine the following Figures 1 to 7 , describing an embodiment of the present invention.

[0031] According to an embodiment of the present invention, on the one hand, a membrane disc coupling simulation member is provided, such as Figure 1-Figure 4 As shown, the membrane disc coupling simulation part includes a membrane disc 1 and a connecting shaft 2. The membrane disc 1 includes a central portion 11 and an edge portion 12 connected to each other, the central portion 11 is annular, the edge portion 12 extends around the entire circumference of the central portion 11, and a plurality of connecting holes 13 are arranged at intervals in the circumferential direction of the edge portion 12. The connecting shaft 2 includes a connecting portion 21 and a clamping portion 22 connected to each other, the connecting portion 21 is connected to the middle of the central portion 11, and the clamping portion 22 is located on one side of the axial direction of the central portion 11.

[0032] In this embodiment, the diaphragm coupling simulation includes a diaphragm 1 and a connecting shaft 2, which includes the real structural features of the diaphragm coupling structure. By using the diaphragm coupling simulation to replace the real diaphragm coupling structure for fatigue strength test, the test cost is reduced and the economy is improved. In addition, by using the connection hole 13 on the diaphragm 1 and the clamping part 22 on the connecting shaft 2 to clamp to the test equipment, the torsion and angular offset loads of the diaphragm coupling structure in the service process are converted into uniaxial tensile loads, which simplifies the test process, is simple to operate, and the test plan is mature and reliable, which further improves the economy.

[0033] It can be understood that the present invention does not specifically limit the number of connection holes 13 , and the connection holes 13 can be set to two, three, four, five, six or other numbers; preferably, the plurality of connection holes 13 are evenly spaced around the circumference of the edge portion 12 .

[0034] The present invention does not specifically limit the molding method of the diaphragm disc 1 and the connecting shaft 2, as long as the stress state can be close to or the same as the stress state of the real diaphragm disc coupling structure. For example, the diaphragm disc 1 and the connecting shaft 2 can be integrally molded.

[0035] In some embodiments, the axial sides of the center portion 11 are recessed in the edge portion 12, that is, the thickness of the center portion 11 is less than the thickness of the edge portion 12, so that the stress of the center portion 11 of the diaphragm 1 is the largest, and gradually decreases in the direction away from the connecting shaft 2. It can be understood that the thickness of the center portion 11 and the edge portion 12 refers to the setting dimensions of the two in the axial direction. In addition, along the axial direction of the center portion 11, at least part of the structure of the connecting portion 21 protrudes from the side of the center portion 11 away from the clamping portion 22, so that the stress state of the diaphragm coupling simulation is closer to the actual diaphragm coupling structure, thereby improving the reliability of the test.

[0036] Exemplarily, the connecting portion 21 and the clamping portion 22 are coaxially arranged, and both are coaxially arranged with the central portion 11 and the edge portion 12. That is, the central portion 11, the edge portion 12, the connecting portion 21, and the clamping portion 22 are on the same axis.

[0037] Exemplarily, the clamping portion 22 can be configured as a column, preferably a cylindrical shape. Exemplarily, the clamping portion 22 includes a columnar segment and a frustum segment connected to each other. Exemplarily, the cross-sectional dimension of the connecting portion 21 along the axial direction is greater than the cross-sectional dimension of the clamping portion 22. Exemplarily, the connecting portion 21 and the clamping portion 22 can be integrally formed.

[0038] In some embodiments, the diaphragm disc 1 further includes a first transition portion 14 and a second transition portion 15. The first transition portion 14 is connected between the central portion 11 and the edge portion 12, and the second transition portion 15 is connected between the central portion 11 and the connecting portion 21. The second transition portion 15 is provided with an annular protrusion 151 extending around the axis, and the annular protrusion 151 is located on the side of the second transition portion 15 away from the clamping portion 22. The provision of the annular protrusion 151 can further optimize the stress state of the diaphragm disc coupling simulation, so that its dangerous part is formed on the central portion 11 to match the real diaphragm disc coupling structure.

[0039] It can be understood that both the first transition portion 14 and the second transition portion 15 are arcuate structures, which can be formed by rounding. The thickness of the first transition portion 14 gradually decreases from the edge portion 12 to the center portion 11; the thickness of the second transition portion 15 gradually decreases from the connection portion 21 to the center portion 11, so as to further ensure that the stress of the center portion 11 of the diaphragm disc 1 is the maximum, and gradually decreases in the direction away from the connection axis 2.

[0040] It is understandable that the location of the annular protrusion 151 can be adaptively adjusted according to the actual stress state of the diaphragm coupling simulation component to match the stress state of the actual diaphragm coupling structure. In some embodiments not shown, the annular protrusion 151 can also be arranged on one side of the second transition portion 15 close to the clamping portion 22.

[0041] Further, in some embodiments, the diaphragm coupling simulation also includes a first fastener, a threaded section 221 is provided on the clamping portion 22, and the first fastener is threadedly connected to the threaded section 221. Exemplarily, the nominal size of the threaded section 221 can be M12, and the length range of the threaded section 221, that is, the axial size can be 20-40mm, preferably 30mm, to prevent later transmission failure. Exemplarily, the first fastener can be a butt nut, the nominal size of the first fastener can be M12, and the thickness of the first fastener, that is, the axial size can be 3-10mm, preferably 5mm, to ensure the accuracy of load transfer. It can be understood that the threaded section 221 and the butt nut can also be set to other sizes, and the specific sizes of the two depend on the actual size of the diaphragm coupling simulation.

[0042] In some embodiments, the diaphragm coupling simulation also includes a plurality of second fasteners, which are respectively inserted into a plurality of connection holes 13, and the second fasteners are used to fix the diaphragm coupling simulation to the external structure. Exemplarily, the above-mentioned connection holes 13 can be evenly spaced around the circumference of the edge portion 12, and six second fasteners are correspondingly arranged. Exemplarily, the second fasteners can be matching bolts and nuts, and the nominal size of the bolts and nuts can be M8, and the nuts can be self-locking nuts to ensure the reliability of the bolt connection, so that the maximum principal stress of the dangerous parts of the diaphragm coupling simulation and the real diaphragm coupling structure are equal, the stress state is close, and the maximum principal stress distribution is similar. It can be understood that the connection holes 13 and the second fasteners can also be set to other numbers, and the bolts and nuts can also adopt other nominal sizes, as long as the maximum principal stress of the dangerous parts of the diaphragm coupling simulation and the real diaphragm coupling structure can be equal, the stress state is close, and the maximum principal stress distribution is similar.

[0043] According to an embodiment of the present invention, on the other hand, a design method for a membrane disc coupling simulation component is also provided, for obtaining the membrane disc coupling simulation component as described above. Specifically, Figure 5 As shown, the design method of the diaphragm disc coupling simulation part specifically includes the following steps:

[0044] Step 1: Determine the structural characteristics of the test piece and the load conditions of the test piece under actual working conditions. The test piece specifically refers to the actual diaphragm coupling structure that needs to be subjected to fatigue strength test.

[0045] Step 2: According to the structural characteristics of the test piece and the load conditions under the actual working conditions, a three-dimensional model and a finite element model of the initial diaphragm coupling simulation part including the structural characteristics of the test piece are established, and the stress field of the initial diaphragm coupling simulation part under the actual working load is calculated and obtained using the linear elastic constitutive model. Among them, the initial diaphragm coupling simulation part at least includes the structural characteristics of the root of the diaphragm profile of the test piece, that is, the structural characteristics of the central part 11 of the diaphragm 1 and the connection between the central part 11 and the connecting shaft 2.

[0046] Step 3: Compare the stress field of the initial diaphragm coupling simulation under the actual working load with the stress state of the test piece under the actual working condition to determine whether the initial diaphragm coupling simulation meets the design requirements; if not, optimize the characteristic structure of the initial diaphragm coupling simulation until it meets the design requirements; if it meets the requirements, proceed directly to the next step.

[0047] Step 4: After completing step 3, based on the initial diaphragm coupling simulation finally obtained, design a clamping structure to obtain a three-dimensional model of the diaphragm coupling simulation; wherein the clamping structure can be the above-mentioned connecting hole 13, threaded segment 221, first fastener and second fastener.

[0048] Step 5: Establish a finite element model based on the three-dimensional model of the diaphragm coupling simulation component, obtain the stress field of the diaphragm coupling simulation component under the actual working load, and compare it with the stress state of the test piece under the actual working condition to ensure that all parts of the diaphragm coupling simulation component can meet the test requirements and avoid local optimization results.

[0049] Step 6: After completing step 5, a diaphragm coupling simulation part is obtained based on the three-dimensional model of the diaphragm coupling simulation part finally obtained and the structural characteristics of the test piece.

[0050] The diaphragm coupling simulation obtained by using the design method of the diaphragm coupling simulation of the present invention reduces the test cost, simplifies the test process, and is simple and reliable to operate. The design method of the present invention retains the local characteristics of the real diaphragm coupling structure (i.e., the root of the diaphragm profile). The local geometric shape not only reflects the machining process and technology, but also determines the local stress distribution characteristics and stress state. By retaining the local geometric shape, the stress distribution and stress state of the dangerous parts of the real structural parts can be reflected more directly and conveniently, so that the working state of the diaphragm coupling simulation is consistent with the real diaphragm coupling structure, the number of optimizations is reduced, and the design efficiency is improved.

[0051] Furthermore, in some embodiments, in step 1, the structural characteristics of the test piece include the geometric shape, size, material parameters, hot and cold processing technology, heat treatment status and surface roughness of the test piece; the load conditions of the test piece under actual working conditions include the environmental conditions, load size and load type of the test piece under actual service conditions.

[0052] Among them, material parameters at least include material grade, elastic modulus, Poisson's ratio, tensile strength and yield strength. These material parameters can be obtained through material performance testing or through material manual inquiries. Since this test is a room temperature test, it is only necessary to obtain the performance parameters of the material at room temperature. Hot and cold processing technology refers to the hot and cold forming processing technology of materials. Hot forming technology specifically refers to the processing technology performed above the recrystallization temperature of the material, such as casting, hot forging, rolling, and welding; cold forming technology specifically refers to the processing technology performed below the recrystallization temperature of the material, such as cold rolling, machining, and electrochemical processing.

[0053] In step 6, a diaphragm coupling simulation is manufactured using the actual material grade, hot and cold processing technology, heat treatment state, and surface roughness of the test piece obtained in step 1. The surface state of the structural part is also a major factor in controlling fatigue behavior. In this embodiment, by considering the surface state of the real structural part, the material, hot processing technology, and surface roughness of the diaphragm coupling simulation are consistent with those of the real diaphragm coupling structure, so that the fatigue life, strength behavior, and control factors of the real diaphragm coupling structure can be fully reflected during the test, thereby improving the reliability of the test.

[0054] In some embodiments, in step 2, a three-dimensional model of the initial membrane disc coupling simulation can be established using three-dimensional modeling software such as UG, and then the three-dimensional model can be divided into hexahedral meshes using software such as Hypermesh. When dividing the meshes, attention should be paid to the mesh quality of the key parts of the simulation to ensure the accuracy of subsequent calculations. Then, based on this mesh model, software such as Abaqus is used to apply loads to obtain the stress field of the initial membrane disc coupling simulation under actual working conditions, that is, the stress distribution cloud map, and obtain the force conditions and the location of the maximum principal stress.

[0055] Specifically, based on the stress field of the initial diaphragm coupling simulation under actual working load, at least the following parts can be identified:

[0056] 1) The deformation mode of the initial membrane disc coupling simulation part including the structural feature part of the test piece;

[0057] 2) Dangerous parts of the initial membrane disc coupling simulation, where the dangerous parts refer to the location of the maximum principal stress;

[0058] 3) Geometric characteristics of hazardous areas;

[0059] 4) Maximum principal stress distribution in dangerous areas;

[0060] 5) Stress distribution at the diaphragm of the initial diaphragm coupling simulation.

[0061] In this embodiment, by identifying the deformation mode, dangerous parts, geometric characteristics of dangerous parts, maximum principal stress distribution and stress distribution of the diaphragm disc surface of the initial diaphragm disc coupling simulation, it is possible to make an actual comparison with the relevant characteristics of the test piece to ensure the reliability of the design of the diaphragm disc coupling simulation.

[0062] In step 3, according to the identification result of step 2, if the position of the maximum principal stress distribution of the initial diaphragm coupling simulation is not located at the dangerous part or on the diaphragm 1, there is an excessive stress condition, or there is a large difference between the stress distribution of the test piece under the actual service condition, it does not meet the design requirements and the characteristic structure of the initial diaphragm coupling simulation needs to be re-optimized. After iterative optimization calculation, an optimal diaphragm coupling simulation is determined.

[0063] Specifically, according to the finite element calculation results in step 2, observe the stress distribution cloud map, judge whether the position of the maximum principal stress is in the key position of the initial diaphragm disc coupling simulation, and the stress distribution on the diaphragm disc 1 of the initial diaphragm disc coupling simulation. If the maximum principal stress is distributed at a position far away from the dangerous part, it is necessary to reconsider the structural design of the simulation. Secondly, if the stress distribution on the diaphragm disc is too large, it is also necessary to reconsider the size and appearance characteristics of the diaphragm disc. The three-dimensional model of the initial diaphragm disc coupling simulation is adjusted and optimized, and the optimization includes adjusting the size of the diaphragm disc 1 and the position of the characteristic structure, and adding excessive fillets (that is, the first transition part 14 and the second transition part 15) to alleviate the stress concentration phenomenon at the places where stress concentration is prone to occur. Finally, the optimized three-dimensional model is meshed and finite element calculated, and the stress distribution cloud map is re-observed to finally confirm an optimal three-dimensional model of the initial diaphragm disc coupling simulation.

[0064] In some embodiments, in step 3, it further includes: determining the working load type and basic mechanical model of the initial membrane disc coupling simulation component, and optimizing the initial membrane disc coupling simulation component according to the determined working load type and basic mechanical model. Exemplarily, the working load type of the initial membrane disc coupling simulation component is the bending load caused by axial and angular offset; and the basic mechanical model of the initial membrane disc coupling simulation component is a cantilever beam.

[0065] In step 4, the clamping method of the initial membrane disc coupling simulation part and the design of the size of the clamping part are specifically included to finally obtain a membrane disc coupling simulation part with a clamping structure. The key factors to be considered in the clamping structure are the length of the clamping end and the clamping method. The length of the clamping end is first determined based on the clamping length range of the fatigue testing machine, and then appropriately adjusted according to the required fixing method for clamping. Based on the test experience, a set of clamping methods with threaded connection as the main load transmission is preliminarily designed, with 2 / 3 of the length of the clamping part 22 as the length of the thread, and a second fastener is set in the connecting hole 13, and a preliminary clamping scheme is obtained.

[0066] In some embodiments, after step 4, the following step is also included: determine whether the clamping structure of the membrane disc coupling simulation component meets the requirements of the test equipment. If it does, execute the next step; if it does not, optimize the clamping structure. In this step, a set of clamping schemes preliminarily designed in step 4 is analyzed. The analysis includes determining the clamping length, requiring it to meet the clamping length of the fatigue testing machine, and applying boundary conditions as close to the actual clamping as possible in the finite element calculation, and performing calculation analysis. The result obtained is required to be basically consistent with the final result in step 3. In addition, considering that the upper thread will loosen when transmitting the load during cyclic loading, it is necessary to lengthen the length of the threaded section 221 and add the top nut to prevent the loosening of the thread when transmitting the load, which may cause inaccurate experimental results. However, it may not be enough for the second fastener in the connecting hole 13 to meet the test requirements only by applying a preload, so it is considered to use a bolt plus a self-locking nut to fix it, so as to improve the reliability of the bolt connection and ensure the accuracy of the test results.

[0067] In step 5, the final finite element calculation is performed on the finalized diaphragm disc coupling simulation. This calculation applies boundary conditions according to the actual clamping method, observes the final stress distribution state, and confirms again that the stress state of each part of the simulation component meets the requirements of the simulation component design. Finally, a diaphragm disc coupling simulation component that meets the project requirements is obtained.

[0068] In some embodiments, before step 6, the step of: determining the test load of the diaphragm coupling simulation part, the test load includes the test maximum load and the test minimum load. The loading load is determined by finite element calculation, and the local maximum principal stress of the diaphragm coupling simulation part is equal to the maximum principal stress of the dangerous part by adjusting the load size in the finite element to obtain the test maximum load of the diaphragm coupling simulation part; and the local minimum stress of the diaphragm coupling simulation part is calculated according to the local stress ratio of the test piece, and the test minimum load of the diaphragm coupling simulation part is determined by combining the finite element calculation method.

[0069] In some embodiments, in step 6, the process specifically includes drawing an engineering drawing of the diaphragm coupling simulation component based on the finally obtained three-dimensional model of the diaphragm coupling simulation component and the structural features of the test component, and annotating and explaining the drawing based on the actual material grade, hot and cold processing technology, heat treatment state and surface roughness of the test component. The actual structural components of the diaphragm coupling simulation component are manufactured using the obtained engineering drawing.

[0070] The design process of the present invention is specifically described below by taking the design of a diaphragm coupling simulation component in a helicopter transmission system as an example.

[0071] Step 1: Determine the load conditions of the test piece, that is, the actual diaphragm coupling structure during service, which are angular displacement of 1.5° (0.02618 radians), torque of 510 N·m, and speed of 6000 r / min (628.3 rad / s). Determine that the actual diaphragm coupling structure material is TC4 titanium alloy, and the implementation standard is "GJB 2218A-2008 Specification for Titanium and Titanium Alloy Bars and Forgings for Aviation", and the material hot processing process is annealing after hot forging, annealing temperature is 750℃, 2h; the geometric shape is a disc-like thin-walled component, and the transition fillet radius at the first transition part 14 and the second transition part 15 of the diaphragm 1 is R5 and R6; the cold processing process is milling plane, rough turning, rough milling, ball head fine milling; because the material has been heat treated, its mechanical processing does not require heat treatment process, only attention needs to be paid to cooling during processing, and the surface roughness is guaranteed to be Ra1.6.

[0072] Step 2: According to the conditions determined in step 1, a 3D model and finite element model containing the real diaphragm coupling structural feature simulation are established using 3D modeling software, and the stress field of the diaphragm coupling structural simulation under the load of the actual working condition is calculated using the linear elastic constitutive model (elastic modulus E = 120Gpa, Poisson's ratio ν = 0.34). And identify 1) the deformation mode of the initial diaphragm coupling simulation is torsion and angular displacement; 2) the dangerous part of the initial diaphragm coupling simulation, that is, the maximum principal stress position is the center 11; 3) the geometric characteristics of the dangerous part; 4) the specific location and size of the maximum principal stress distribution in the dangerous part, the maximum principal stress size is 320MPa; 5) the stress distribution condition at the diaphragm 1 is that the stress in the center 11 is the largest, and the stress gradually decreases in the radial direction.

[0073] Step 3: Analyze the stress distribution state according to the finite element calculation results of step 2, and find that the maximum principal stress does not appear in the center part 11, so this simulation does not meet the simulation design requirements. Therefore, through structural optimization, an annular protrusion 151 is set on the side of the second transition part 15 away from the clamping part 22, so that the dangerous part of the membrane disc coupling simulation is located on the side away from the clamping part 22. After calculation and confirmation, it is found that this design idea is feasible, so after optimization, the following is obtained Figure 6 The three-dimensional model shown in the figure is obtained through linear elastic analysis. Figure 7 The stress distribution cloud diagram is shown.

[0074] Step 4: Based on the final result of step 3, design the clamping structure. Bolt connection is adopted at the clamping part 22, and a threaded section 221 is set at the clamping part 22, with a nominal size of M12 and a length of 30mm to prevent transmission failure in the later stage; and a top nut with a nominal size of M12 and a thickness of 5mm is added to ensure the accuracy of load transfer. Six connecting holes 13 and six second fasteners respectively arranged in the six connecting holes 13 are set. The second fasteners include matching bolts and nuts, both of which have a nominal size of M8, and the nuts are self-locking nuts to ensure the reliability of the bolt connection.

[0075] Step 5: Using the finite element model and calculation, the stress field of the diaphragm coupling simulation under the actual working load is obtained by applying the load condition close to the actual service scenario (axial displacement is 0.14mm). And compared with the test piece, if the maximum stress of the diaphragm coupling simulation is equal to the maximum principal stress of the dangerous part of the test piece, the stress state is close, and the maximum principal stress distribution is similar, then proceed to the next step; otherwise, the characteristic structure of the diaphragm coupling simulation needs to be further optimized.

[0076] Step 6: The engineering drawing of the diaphragm coupling simulation part is obtained according to the diaphragm coupling simulation part obtained after step 5. The material parameters, hot and cold processing technology and surface condition of the diaphragm coupling simulation part are specified according to the structural characteristics of the test piece. The real structural part of the diaphragm coupling simulation part is processed according to the engineering drawing.

[0077] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A membrane disc coupling simulation component, characterized in that: include: The membrane disc (1) comprises a central portion (11) and an edge portion (12) connected to each other; the central portion (11) is in a circular ring shape, the edge portion (12) extends around the entire circumference of the central portion (11), and a plurality of connection holes (13) are arranged at intervals in the circumferential direction of the edge portion (12); The connecting shaft (2) comprises a connecting portion (21) and a clamping portion (22) connected to each other; the connecting portion (21) is connected to the middle of the central portion (11), and the clamping portion (22) is located on one axial side of the central portion (11).

2. The membrane disk coupling simulation component according to claim 1, characterized in that: Both axial sides of the central portion (11) are recessed into the edge portion (12); Along the axial direction of the central portion (11), at least a portion of the structure of the connecting portion (21) protrudes from a side of the central portion (11) away from the clamping portion (22).

3. The membrane disk coupling simulation component according to claim 2, characterized in that: The membrane disk (1) also includes a first transition portion (14) and a second transition portion (15); the first transition portion (14) is connected between the central portion (11) and the edge portion (12), and the second transition portion (15) is connected between the central portion (11) and the connecting portion (21); the second transition portion (15) is provided with an annular protrusion (151) extending around the axis, and the annular protrusion (151) is located on the side of the second transition portion (15) away from the clamping portion (22).

4. The membrane disk coupling simulation component according to claim 1 or 2, characterized in that: The diaphragm coupling simulation component also includes a first fastener, and a threaded section (221) is provided on the clamping portion (22), and the first fastener is threadedly connected to the threaded section (221).

5. The membrane disk coupling simulation component according to claim 4, characterized in that: The diaphragm coupling simulation component also includes a plurality of second fasteners, which are respectively inserted into the plurality of connection holes (13), and the second fasteners are used to fix the diaphragm coupling simulation component to an external structure.

6. A method for designing a membrane disc coupling simulation component, for obtaining a membrane disc coupling simulation component as claimed in any one of claims 1 to 5, characterized in that: Includes steps: Step 1: Determine the structural characteristics of the test piece and determine the load conditions of the test piece under actual working conditions; Step 2: According to the structural characteristics of the test piece and the load conditions under actual working conditions, a three-dimensional model and a finite element model of the initial diaphragm coupling simulation piece including the structural characteristics of the test piece are established, and the stress field of the initial diaphragm coupling simulation piece under the actual working load is calculated and obtained by using a linear elastic constitutive model; Step 3: Compare the stress field of the initial diaphragm coupling simulation under the actual working load with the stress state of the test piece under the actual working condition to determine whether the initial diaphragm coupling simulation meets the design requirements; if not, optimize the characteristic structure of the initial diaphragm coupling simulation until it meets the requirements; Step 4: After completing step 3, based on the initial membrane disc coupling simulation component finally obtained, a clamping structure is designed to obtain a three-dimensional model of the membrane disc coupling simulation component; Step 5: Establish a finite element model based on the three-dimensional model of the diaphragm coupling simulation component, obtain the stress field of the diaphragm coupling simulation component under the actual working condition load, and compare it with the stress state of the test piece under the actual working condition to ensure that each part of the diaphragm coupling simulation component can meet the test requirements; Step 6: After completing step 5, the diaphragm coupling simulation component is obtained according to the finally obtained three-dimensional model of the diaphragm coupling simulation component and the structural characteristics of the test component.

7. The design method of the membrane disk coupling simulation component according to claim 6 is characterized in that: In step 1, the structural characteristics of the test piece include the geometric shape, size, material parameters, hot and cold processing technology, heat treatment state and surface roughness of the test piece; The load conditions of the test piece under actual working conditions include the environmental conditions, load magnitude and load type of the test piece under actual service conditions.

8. The design method of the membrane disk coupling simulation component according to claim 6 or 7, characterized in that: In step 2, according to the stress field identification of the initial diaphragm coupling simulation under the actual working load: The deformation mode of the initial membrane disc coupling simulation piece including the structural feature portion of the test piece; The dangerous part of the initial membrane disc coupling simulation part, the dangerous part refers to the maximum principal stress position; The geometrical characteristics of the dangerous part; The maximum principal stress distribution of the dangerous part; The stress distribution condition at the diaphragm of the initial diaphragm coupling simulation component.

9. The design method of the membrane disk coupling simulation component according to claim 8, characterized in that: In step 3, it also includes: determining the working load type and basic mechanical model of the initial diaphragm disc coupling simulation component, and optimizing the initial diaphragm disc coupling simulation component according to the determined working load type and basic mechanical model.

10. The design method of the membrane disk coupling simulation component according to claim 9, characterized in that: Before step 6, the method further includes the steps of: determining a test load of the diaphragm coupling simulation component, the test load including a maximum test load and a minimum test load; Among them, finite element calculation is used to determine the loading load, and the local maximum principal stress of the diaphragm disc coupling simulation is made equal to the maximum principal stress of the dangerous part by adjusting the load size in the finite element, so as to obtain the test maximum load of the diaphragm disc coupling simulation; and the local minimum stress of the diaphragm disc coupling simulation is calculated according to the local stress ratio of the test piece, and the test minimum load of the diaphragm disc coupling simulation is determined in combination with the finite element calculation method.

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