Jaw and design method thereof
Through spline curve design and finite element optimization, the problem that the jaw mating end surface cannot adapt to warping and deformation is solved, the good contact between the jaw and the blade tenon and the tight seal of the cooling air is achieved, and the reliability and performance of the engine are improved.
Patent Information
- Application Number
- CN202311606275.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-28
- Publication Date
- 2025-05-30
AI Technical Summary
The existing jaw fit end surface design cannot adapt to the warping deformation caused by the grating disc or baffle in the working state, resulting in the inability to maintain good contact with the target surface in the working state of the engine, which in turn causes axial loosening of the blade tenon and cooling air leakage.
The spline curve design method is adopted to optimize the axial coordinates of the end face of the jaw mating end face through the finite element model and genetic algorithm to ensure that the end face of the blade tenon is in an overall basic contact state under the engine working state.
The good contact state of the jaw mating end surface in the engine working state is achieved, which more reliably limits the axial movement of the blade tenon and prevents the leakage of cooling gas.
Smart Images
Figure CN120061929A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a chuck and a design method thereof, and particularly to a mating end face of a chuck for an aeroengine and a design method of the mating end face of the chuck. Background Art
[0002] In components such as labyrinth disks and baffles of aeroengines, a chuck structure is generally included, such as Figure 1 the chuck 02 on the labyrinth disk 01 in Figure 1 and the chuck 04 on the baffle 03 in
[0003] At present, the existing mating end face of the chuck is generally designed in a regular and flat shape. For example, Figure 2 the shape of the axial mating end face 06 of the chuck 02 located on the labyrinth disk 01 shown in Figure 1 is a regular ring and is located in a plane perpendicular to the engine rotation axis. In the two-dimensional view of the radial section shown in the projection of the axial mating end face 06 of the chuck 02 is a straight line segment perpendicular to the engine rotation axis.
[0004] Under the action of bolt pre-tightening force, thermal stress, surface static pressure and centrifugal load, rotor components with a small thickness such as labyrinth disks and baffles will undergo obvious warping deformation. As a result, the traditional flat-shaped mating end face of the chuck cannot maintain a good contact state with the tenon head under actual working conditions, as shown in Figure 3A and Figure 3B shown. In the finite element analysis results shown in Figure 3A and Figure 3B only individual nodes near the inner edge of the axial mating end face 06 of the chuck 02 are in contact with the front end face of the tenon head 05, while most of the other nodes are separated from the front end face of the tenon head 05 due to the warping deformation of the labyrinth disk 01 in the working state. Obviously, in this case, the axial mating end face 06 of the chuck 02 and the target surface (the front end face of the tenon head 05) do not reach a reliable contact state, and the originally expected surface contact degenerates into line contact. Considering transient factors such as maneuvering loads and engine acceleration and deceleration, the mating end face of the chuck may even be completely separated from the target surface, resulting in faults such as axial loosening of the blade tenon head and leakage of cooling air for cooling the turbine moving blade.
[0005] The fundamental reason for the above problems is that the existing claw mating end faces with regular flat shapes cannot adapt to the warping deformation of the labyrinth disc (or baffle) under the working state. The only solution is to break through the existing design, implement a claw mating end face design different from the regular flat shape, improve the contact state of the claw mating surface under the engine working state, and thus more reliably restrict the axial movement of the blade tenon and prevent the leakage of cooling air. That is, the two design objectives of more reliably restricting the axial movement of the blade tenon and preventing the leakage of cooling air are both achieved by keeping the axial mating end faces of claws 02 and 04 in contact with the front and rear end faces of the tenon 05 under the working state. The success or failure of the claw structure design depends on whether the claw mating end face can maintain a good contact state with the target faces (the front end face and the rear end face of the tenon 05) under the engine working state.
[0006] Regarding the problem that the existing claw mating end faces with regular flat shapes cannot adapt to the warping deformation of the labyrinth disc (or baffle) under the working state, resulting in the inability to maintain an ideal contact state with the target faces under the engine working state, and further leading to problems such as axial loosening of the blade tenon and leakage of the cooling air for cooling the turbine rotor blades, the present invention proposes a design method for claws. The claws are used to restrict the axial movement of the blade tenon under the working state where the claws and the blade tenon rotate, and the mating end faces of the claws are designed to be in an overall basic contact state with the end faces of the blade tenon under the working state where the claws and the blade tenon rotate.
[0007] Technical solutions for solving technical problems
[0008] To solve the above problems, the first aspect of the present invention relates to a design method for claws. The claws are used to restrict the axial movement of the blade tenon under the working state where the claws and the blade tenon rotate, and the mating end faces of the claws are designed to be in an overall basic contact state with the end faces of the blade tenon under the working state where the claws and the blade tenon rotate.
[0009] Further, the claws are arranged on the labyrinth disc included in the aeroengine, and the blade tenon is a component included in the aeroengine.
[0010] Further, the claws are arranged on the baffle included in the aeroengine, and the blade tenon is a component included in the aeroengine.
[0011] Further, an objective function is established to characterize the contact sealing effect between the new mating end face shape formed after axially adjusting the coordinates of each node on the mating end face of the claw and the end face of the blade tenon under the working state.
[0012] Using a genetic algorithm, search for the axial coordinate adjustment amounts applied to each node on the mating end face of the chuck that can maximize the objective function, and
[0013] Design the mating end face of the chuck based on the axial coordinate adjustment amounts applied to each node on the mating end face of the chuck.
[0014] Further, after designing the mating end face of the chuck based on the axial coordinate adjustment amounts applied to each node on the mating end face of the chuck, perform a smoothing process on the spline curve of the mating end face of the chuck.
[0015] In addition, a second aspect of the present invention relates to a chuck that is used to limit the axial movement of a blade tenon in a working state where the chuck and the blade tenon rotate, and the mating end face of the chuck is designed to be in an overall substantially contacting state with the end face of the blade tenon in a working state where the chuck and the blade tenon rotate.
[0016] In addition, a third aspect of the present invention relates to a computer device, including: a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein when the processor executes the computer program, the above-mentioned design method of the chuck is implemented.
[0017] In addition, a fourth aspect of the present invention relates to a computer-readable medium on which a computer program is stored, and when the computer program is executed by a processor, the above-mentioned design method of the chuck is implemented.
[0018] Advantages of the Invention
[0019] According to the chuck and the design method of the chuck involved in the present invention, the following technical effects can be achieved:
[0020] (1) Break through the traditional design idea of the existing regular flat shape of the chuck mating end face, design a chuck mating end face with a spline curve shape, so that the curved surface of the chuck mating end face can exactly offset and compensate for the warping deformation generated by the labyrinth disc (or baffle) in the working state, ensure that the chuck mating end face can maintain a good contact state with the target surface in the engine working state, more reliably limit the axial movement of the blade tenon, and seal and prevent leakage of the cooling air;
[0021] (2) Taking the nodes on the jaw mating end face in the finite element model as the control points of the spline curve, and taking the coordinates of the nodes on the jaw mating end face as the design variables, a design method of the spline curve of the jaw mating end face based on finite element contact calculation is established, and an objective function that quantitatively reflects the contact sealing effect is established. Taking the extremum of this objective function as the goal, the control points of the spline curve of the jaw mating end face are optimized to ensure that the optimized shape of the jaw mating end face curve can exactly offset and compensate for the warping deformation generated by the labyrinth disc (or baffle) under the working condition, so as to achieve the best contact sealing effect when the engine is working;
[0022] (3) Based on the discrete optimization results of the control points of the spline curve based on finite element contact calculation, a smoothing method for the spline curve of the jaw mating end face is proposed. The Hermit interpolation curve is used to realize the smoothing treatment of the spline curve of the jaw mating end face with little modification of the control point coordinates, which is convenient for subsequent processing and manufacturing. Description of the Drawings
[0023] Figure 1 is a cross-sectional schematic view showing the traditional jaw structure on the labyrinth disc and baffle of the high-pressure turbine rotor of an aeroengine.
[0024] Figure 2 is a three-dimensional schematic view showing the axial mating end face of the jaw with a regular straight shape on the traditional labyrinth disc.
[0025] Figure 3A and Figure 3B is a cross-sectional schematic view showing the actual sealing effect of the axial mating end face of the jaw on the traditional labyrinth disc under the working condition of the engine.
[0026] Figure 4 is a cross-sectional schematic view showing the axial mating end face of the jaw with a regular straight shape designed for the labyrinth disc of the high-pressure turbine rotor according to the existing method.
[0027] Figure 5 is a cross-sectional schematic view showing the mesh near the axial mating end face of the jaw in the two-dimensional finite element model of the high-pressure turbine rotor in an embodiment of the design method of the jaw involved in the present invention.
[0028] Figure 6 is a cross-sectional schematic view showing the nodes on the axial mating end face of the jaw in the two-dimensional finite element model of the high-pressure turbine rotor in an embodiment of the design method of the jaw involved in the present invention.
[0029] Figure 7 is a cross-sectional schematic view showing the nine design variables required to optimize the shape of the axial mating end face of the jaw in an embodiment of the design method of the jaw involved in the present invention.
[0030] Figure 8AIt is a cross-sectional schematic view showing the contact sealing effect of the axial mating end face of the chuck before optimization. Figure 8B It is a cross-sectional schematic view showing the contact sealing effect of the optimized axial mating end face of the chuck in an embodiment of the design method of the chuck involved in the present invention.
[0031] Label description
[0032] 01 Labyrinth disc
[0033] 02, 04 Chucks
[0034] 03 Baffle
[0035] 05 Blade tenon
[0036] 06 Mating end face of the chuck
[0037] 001 Labyrinth disc
[0038] 002 Chuck
[0039] 003 Mating end face of the chuck
[0040] 004 Blade tenon Detailed implementation manner
[0041] The present invention will be described in detail below with reference to the accompanying drawings and specific implementation manners. This implementation manner is carried out on the premise of the technical solution of the present invention, and detailed implementation manners and specific operation processes are given, but the protection scope of the present invention is not limited to the following implementation manners.
[0042] For the sake of convenience of description, spatial relative terms such as "beneath", "below", "lower", "above", "upper", etc. may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure. It should be understood that the spatial relative terms are intended to include different orientations of the device in addition to the orientation shown in the figure. For example, if the device in the figure is flipped, an element described as "beneath" or "below" other elements or features will be oriented "above" other elements or features.
[0043] Unless otherwise defined, the terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention pertains. The terms should be understood to have a meaning consistent with the context of the related art and should not be understood in an idealized or overly formalized manner unless clearly defined as such herein.
[0044] <Design method of the chuck>
[0045] Next, with reference to Figure 48, an embodiment of the design method of the jaws according to the present invention will be described in detail. Here, the same reference numerals are used for the same parts.
[0046] Furthermore, before describing the design method of the clamping jaws according to the present invention, various terms used in the present application will be described first.
[0047] (1) Spline curve
[0048] A spline curve is a curve whose shape is controlled by a series of given points and is connected by polynomial curve segments, satisfying specific continuity conditions at the boundaries of each segment.
[0049] (2) Counterface
[0050] The mating end face refers to the mating surface of the claw that is designed to contact other structures when in working condition and is used for sealing or limiting.
[0051] (3) Optimal design
[0052] Optimization design refers to the establishment of an objective function based on the optimization theory according to the performance pursued in the design, and the search for a design solution that maximizes (or minimizes) the objective function while satisfying given constraints.
[0053] (4) Finite element analysis
[0054] Finite element analysis refers to a numerical technique for finding approximate solutions to boundary value problems of partial differential equations. When solving, the entire problem area is decomposed into several small interconnected subdomains, and then the simple equations on these small areas, called units, are combined to obtain approximate solutions to complex equations on larger areas.
[0055] As an embodiment, the design method of the clamping claw involved in the present invention is as follows:
[0056] First, a grate disc 001 of a high-pressure turbine is designed for a certain type of aircraft engine according to an existing method. The claw structure 002 on the grate disc 001 of the high-pressure turbine has a mating end surface 003 of a regular straight shape, such as Figure 4 shown.
[0057] Then, a two-dimensional finite element model of the high-pressure turbine rotor of a certain type of aircraft engine, including the turbine disk, mortise and tenon, tenon, blade equivalent mass point, sealing disk, baffle, bolt connection, rear shaft, air duct and other auxiliary structures, is established with mm as the length unit, and contact units and target units are set on both sides of all contact pairs including the claw mating end face 003;Figure 5 As shown, the target surface of the jaw mating end face 003 is the front end face of the tenon 004.
[0058] Then, extract the node numbers and node coordinates of the nodes located on the jaw mating end face 003. As an example, the number of nodes K on the jaw mating end face is 9. Sort the K = 9 mating end face nodes in ascending order of radial coordinates to obtain the mating end face node numbers N 1 = 825780, N 2 = 825782, N 3 = 825784, N 4 = 825786, N 5 = 825788, N 6 = 825790, N 7 = 825792, N 8 = 825794, N 9 = 825796, as Figure 6 shown.
[0059] Then, extract the axial components of the coordinates of the N 1 , N 2 ,..., N 9 a total of 9 mating end face node coordinates. As an example, in the current regular flat mating end face modeling, there are
[0060] Then, treat the change amount of the axial coordinate component of each of the N 1 , N 2 ,..., N 9 a total of 9 mating end face nodes on the jaw mating end face as independent design variables to obtain 9 design variables required to optimize the shape of the jaw mating end face, that is As Figure 7 shown; the axial coordinate components of the jaw mating end face nodes after considering the axial coordinate change amount are
[0061] Then, establish the objective function to characterize the contact sealing effect between the jaw mating end face and the front end face of the tenon under the engine working condition after implementing axial coordinate adjustment on each node on it and forming a new mating end face shape;
[0062] Then, as an example, set the change amount 1 of the axial coordinate component of each of the N 2 ,..., N 9 a total of K = 9 mating end face nodes on the jaw mating end face The allowable variation range is [-0.5, 0.5], that is Use the genetic algorithm to search for the maximum of the objective function As an example, the population size is set to 30, and each individual in the initial population is randomly generated using a uniform distribution within [-0.5, 0.5], and it is ensured that the number of local sawteeth included in the jaw mating end face 003 defined by each individual in the initial population is less than N tooth = 2; if the number of local sawteeth of the jaw mating end face corresponding to a randomly generated individual in the initial population is greater than or equal to N tooth , then delete this individual and continue to randomly generate a new individual using a uniform distribution within [-0.5, 0.5], and then identify the number of local sawteeth included in the jaw mating end face defined by the new individual until the population size reaches the preset value of 30;
[0063] Then, calculate the objective function of each individual in the population The steps are ① Modify the axial coordinate components of the jaw mating end face nodes N in the overall two-dimensional finite element model of the high-pressure turbine rotor according to the 1 , N 2 ,..., N 9 values of each individual. The modified axial coordinate components are ② Perform contact finite element analysis on the basis of the overall two-dimensional finite element model of the high-pressure turbine rotor with the modified jaw mating end face node coordinates; ③ Read the contact status scores of the N 1 , N 2 ,..., N 9 a total of K = 9 mating end face nodes on the jaw mating end face from the contact finite element analysis results (separation takes 0, separation but close to contact takes 1, sliding contact takes 2, non-sliding contact takes 3), and then calculate the sum of the status scores of the K = 9 mating end face nodes and return it as the objective function value of the individual;
[0064] Then, the sorting method is used to convert the objective function values of each individual in the population into fitness values to eliminate the influence of the objective function value range on the selection operation. As an example, the roulette wheel method is used to select parents for the next-generation population according to the fitness values of the current population individuals: it is agreed that the two individuals with the highest fitness values in the population (elite offspring) directly enter the next-generation population, and 22 of the remaining 28 next-generation population individuals are generated by crossover, and the remaining 6 are generated by mutation; 22 crossover offspring individuals are generated by the random weighted average method, 6 mutation offspring individuals are generated by the Gaussian random method, and together with the 2 best elite offspring individuals in the current population, a total of 30 offspring individuals constitute the next-generation population;
[0065] Then, as an example, set the maximum population iteration number to 100, and the optimal individual is obtained after the genetic algorithm runs to completion According to The optimized axial coordinates of each of the K = 9 mating end-face nodes on the jaw mating end-face 003 are obtained. Corresponding to 1 , N 2 ,..., N 9 A total of K = 9 mating end-face nodes The corresponding jaw mating end-face, at the engine operating state, N 7 = 825792, N 8 = 825794, N 9 = 825796, the three nodes are in a separated but nearly contacting state, that is, Stat N7 = Stat N8 = Stat N9 = 1; N 1 = 825780, N 2 = 825782, N 3 = 825784, N 4 = 825786, N 5 = 825788, N 6 = 825790, the six nodes are in a sliding contact state, that is Therefore, the objective function of the optimal individual is significantly higher than the objective function value corresponding to the initial regular flat jaw mating end-face design. The initial regular flat jaw mating end-face design, that is, the mating end-face node coordinates When, at the engine operating state, N 3 = 825784, N 4 = 825786, N 5 = 825788, the three nodes are in a separated but nearly contacting state; N 6 = 825790, N 7 = 825792, N 8 = 825794, N9 = 825796 Four nodes are in a separated state; only N 1 = 825780, N 2 = 825782 Two nodes are in a sliding contact state. Therefore, the objective function corresponding to the initial regular flat jaw mating end face design is only 1×3 + 2×2 = 7; from Figure 8A and Figure 8B 's comparison, it can also be clearly seen that the number of mating end face nodes in the sliding contact state during the engine working state increases from 2 in the initial design to 6 in the optimized design. After the optimized design, the sealing effect of the jaw mating end face has been significantly improved.
[0066] In addition, the spline curve of the mating end face can be further smoothed on the basis of . After, for example, 3 iterations, a jaw mating end face with uniform curvature change is obtained. Compared with the maximum coordinate adjustment amount of , it does not exceed 0.001 mm. The smoothing of the spline curve of the jaw mating end face is completed on the premise of making very small modifications to the control points.
[0067] Above, an example with 9 nodes on the jaw mating end face is shown, but the present invention is not limited thereto. Below, a more general case with K nodes on the jaw mating end face is shown.
[0068] (S1) Design a jaw structure with a regular flat mating end face on the contact sealing parts (labyrinth disc or baffle) according to the existing method. The so-called regular flat mating end face means that ① the mating end face is annular and located in a plane perpendicular to the engine rotation axis, and ② the projection of the mating end face on the two-dimensional axisymmetric view of the engine is a straight line segment perpendicular to the engine axis;
[0069] (S2) Establish a two-dimensional finite element model of the high-pressure turbine rotor as a whole, including the turbine disc, dovetail groove, dovetail, equivalent mass points of the blades, sealing disc, baffle, bolt connection, rear shaft, air duct and other accessory structures, and set contact elements and target elements on both sides of all contact pairs including the jaw mating end face;
[0070] (S3) Extract the node numbers and node coordinates of the nodes located on the jaw mating end face. Without loss of generality, assume that the number of nodes on the jaw mating end face is K. Sort the K mating end face nodes in ascending order of radial coordinates to obtain the mating end face node numbers N 1 , N 2 ,..., N K ;
[0071] (S4) Extract N 1 , N 2 ,..., NK The axial components of the coordinates of a total of K mating end face nodes. When modeling, the y-axis is selected as the rotation axis, and the x-axis is the radial direction. The axial components of the coordinates of the K mating end face nodes are respectively Since the current jaw mating end face has a regular and flat shape, the K mating end face nodes also have the same coordinate axial component y init , that is
[0072] (S5) In order to be able to adjust the shape of the jaw mating end face to offset the warping deformation generated by the labyrinth disc (or baffle) in the working state, it is necessary to redesign the axial coordinate components of each node on the jaw mating end face; the change amounts of the axial coordinates of each of the N 1 , N 2 , …, N K A total of K mating end face nodes are treated as independent design variables, that is, K design variables required to optimize the shape of the jaw mating end face are obtained, that is Considering the axial coordinate change amount The axial coordinate components of the jaw mating end face nodes after that are
[0073] (S6) In order to be able to quantitatively reflect the contact and sealing effect of the jaw mating end face in the engine working state, the following objective function is established where is used to characterize the contact state of N 1 , N 2 , …, N K A total of K mating end face nodes with the target surface in the engine working state: ① If the mating end face node N i is separated from the target surface in the engine working state, then ② If the mating end face node N i is in a separated state from the target surface in the engine working state but the distance is extremely close, ③ If the mating end face node N i keeps in contact with the target surface in the engine working state but slides between the two during the loading process, then ④ If the mating end face node N i keeps in contact with the target surface in the engine working state and does not slide between the two during the loading process, then Obviously, the larger the value of, the better the contact and sealing effect of the jaw mating end face in the engine working state; The value of depends on the shape of the jaw mating end face, that is, it depends on the value combination of a total of K design variables, and It can only be determined after finite element contact calculation, so the objective function is an implicit function that depends on finite element contact calculation;
[0074] (S7) Determine the change amount of the axial coordinate component of each of the N 1 , N 2 ,..., N K a total of K mating end face nodes on the chuck mating end face, and use this as a constraint condition to search using a genetic algorithm for the one that can make the objective function reach the maximum value. The specific steps are as follows: ① Generate an initial population using a random uniform distribution within the allowed variation range; ② According to the values of each individual in the population, modify the axial coordinate component of the chuck mating end face nodes N in the overall two-dimensional finite element model of the high-pressure turbine rotor. The modified axial coordinate component is ③ Based on the overall two-dimensional finite element model of the high-pressure turbine rotor with the axial coordinate component of the chuck mating end face nodes modified, calculate the corresponding 1 , N 2 ,..., N K for each individual in the population through finite element contact analysis. In order to improve the optimization efficiency and avoid wasting computing resources due to meaningless finite element contact analysis in the case of multiple local sawteeth on the chuck mating end face, before calling the finite element solver, first calculate the sequence formed by the differences between the pairwise axial coordinate adjustment amounts of the individuals Then calculate the product of two adjacent elements in this sequence to obtain and judge the positive and negative signs of each Sign (i = 1, 2,..., K - 2). The number of negative numbers in Sign (i = 1, 2,..., K - 2) represents the number of local sawteeth on the chuck mating end face. It is agreed that when the number of negative numbers in Sign (i = 1, 2,…, K - 2) is greater than or equal to N i (preferably set N i = 2, that is, at most only 1 local sawtooth is allowed to appear on the chuck mating end face), directly set the objective function of the individual i to zero without performing finite element contact analysis; in addition, for the objective function of individuals outside the tooth (preferably set N tooth = 2, that is, at most only 1 local sawtooth is allowed to appear on the chuck mating end face), directly set the objective function of the individual to zero without performing finite element contact analysis; in addition, for the objective function of individuals outside the allowed variation range It is also directly set to zero without performing finite element contact analysis; ④ Calculate the fitness value of each individual in the population according to the objective function value of the individual; ⑤ Compare the fitness values of each individual in the population and save the best individual; ⑥ Determine whether the termination condition is met. If so, obtain the K knot values of the optimal jaw mating end face shape. If not, perform selection, crossover, and mutation operations to generate a new generation of population; ⑦ Execute steps ②, ③, ④, ⑤, and ⑥ for the new generation of population until the genetic algorithm termination condition is met, and obtain the optimal individual There are two choices for the termination condition. One is that the optimal individual makes the objective function reach the preset threshold (the contact sealing effect of the jaw mating end face reaches the design expectation), and the other is to limit the maximum number of population iterations.
[0075] (S8) The optimal individual obtained in (S7) is the discrete optimization result of the jaw mating end face shape based on the finite element model. In the finite element model, the jaw mating end face shape is a broken line formed by (K - 1) straight line segments connected end to end, which does not meet the processing and manufacturing requirements. To meet the processing and manufacturing requirements, a smooth curve can be further generated according to the K optimized mating end face nodes.
[0076] Optimal individual The truncation error and numerical noise in are very likely to cause the spline curve generated based on the optimal individual to have problems such as large fluctuations in curvature change and many curvature mutation points, which are not convenient for processing and manufacturing; therefore, it is necessary to smooth the spline curve of the mating end face based on the optimized axial coordinates of the mating end face nodes On this basis, perform smoothing processing on the spline curve of the mating end face. Preferably, referring to the Kjellander method, the following steps are used to obtain the smooth spline curve representing the jaw mating end face:
[0077] ① Based on Construct a cubic spline curve L using the interpolation method (instead of the fitting method) 0 , L 0 exactly passes through That is, it exactly passes through K mating end face nodes; ② According to the "bad point" selection criterion with the largest jump in the third derivative, identify the mating end face node that has the greatest impact on the smoothness of the spline curve from the K mating end face nodes. Let its node number be N j , and the node coordinate be P j , and the parameter corresponding to P 0 on L j be t j ; ③ Let the node coordinates of the mating end face nodes N j adjacent to N j-1 and N j+1 be P j-1 and Pj+1 , the parameters on L 0 are \(t\) j-1 and \(t\) j+1 , and using the tangent vectors \(P'\) 0 at \(P\) j-1 and \(P\) j+1 to construct a cubic Hermite interpolation curve \(C\) j-1 (t) (\(t\) j+1 < \(t < t\) 0 ), and making \(C\) j-1 (t j+1 ) = \(P\) 0 , \(C\) j-1 (t j-1 ) = \(P\) 0 , \(C'\) j+1 (t j+1 ) = \(P'\) 0 , \(C'\) j-1 (t j-1 ) = \(P'\) 0 , \(C'\) j+1 (t j+1 ) = \(P'\) j ; ④ Modify the coordinates of node \(N\) j so that \(P\) 0 = \(C\) j (t j ). After completing the modification of the node coordinates of \(N\) j , according to the current \(K\) mating end face nodes (the \(N\) 0 in the current mating end face nodes uses the modified node coordinates, that is, \(C\) j )(t 1 ) to construct a cubic spline curve \(L\) 1 by interpolation. Then, select the next mating end face node to be adjusted according to the "bad point" selection criterion with the largest jump in the third derivative from \(L\) 1 , and locally construct a cubic Hermite interpolation curve \(C\) 1 at it. Modify the "bad point" coordinates according to \(C\) 2 ; Then, construct a cubic spline curve \(L\)
[0078] by interpolation according to the \(K\) mating end face nodes with the modified "bad point" coordinates, and so on, continuously iterate until a uniformly changing curvature jaw mating end face is obtained.
[0079] In addition, the present invention also provides a jaw, which is obtained by using the above jaw design method.
[0080] In addition, the present invention also provides a computer-readable medium, on which a computer program is stored. When the computer program is executed by a processor, the above-mentioned design method of the jaw is implemented.
[0081] Thus, according to the design method of the jaw involved in the present invention and the jaw obtained by using this design method, the following technical effects can be achieved:
[0082] (1) Break through the traditional design idea of the flat and straight shape of the existing jaw mating end face, and design a jaw mating end face with a spline curve shape, so that the curved surface of the jaw mating end face can exactly offset and compensate for the warping deformation generated by the labyrinth disc (or baffle) in the working state, ensuring that the jaw mating end face can maintain a good contact state with the target surface under the working state of the engine, more reliably restricting the axial movement of the blade tenon, and sealing the cooling air to prevent leakage;
[0083] (2) Take the nodes of the jaw mating end face in the finite element model as the control points of the spline curve, and take the coordinates of the nodes of the jaw mating end face as the design variables, establish a design method of the spline curve of the jaw mating end face based on the finite element contact calculation, and establish an objective function that quantitatively reflects the contact sealing effect. Optimize the control points of the spline curve of the jaw mating end face with the aim of making the objective function reach the extreme value, ensuring that the optimized curved surface shape of the jaw mating end face can exactly offset and compensate for the warping deformation generated by the labyrinth disc (or baffle) in the working state, and achieving the best contact sealing effect when the engine is working;
[0084] (3) On the basis of the discrete optimization results of the control points based on the finite element contact calculation, propose a smoothing method for the spline curve of the jaw mating end face, and use the Hermit interpolation curve to achieve the smoothing treatment of the spline curve of the jaw mating end face with little modification of the control point coordinates, which is convenient for subsequent processing and manufacturing.
[0085] It should be understood that the above description is illustrative rather than restrictive. For example, the above embodiments (and / or aspects thereof) can be used in combination with each other. In addition, many modifications can be made without departing from the scope of the present invention to adapt a specific situation or material to the teachings of the various embodiments of the present invention. Although the size and type of the materials described herein are used to define the parameters of the various embodiments of the present invention, each embodiment is not meant to be restrictive, but rather an exemplary embodiment. Many other embodiments will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the various embodiments of the present invention should be determined with reference to the appended claims and the full scope of the equivalent forms claimed thereby.
[0086] Industrial Applicability
[0087] The chuck and the design method of the chuck involved in the present invention can be widely applied to the chuck structures arranged in parts such as the labyrinth disc and the baffle plate of an aeroengine.
Claims
1. A design method for a chuck, the chuck being used to restrict the axial movement of a blade tenon in the working state where the chuck and the blade tenon rotate, design the mating end face of the chuck such that in the working state where the chuck and the blade tenon rotate, it is in an overall substantially contacting state with the end face of the blade tenon.
2. The design method for a chuck according to claim 1, characterized in that, the chuck is arranged on a labyrinth disc included in an aeroengine, the blade tenon is a component included in the aeroengine.
3. The design method for a chuck according to claim 1, characterized in that, the chuck is arranged on a baffle plate included in an aeroengine, the blade tenon is a component included in the aeroengine.
4. The design method for a chuck according to any one of claims 1 to 3, characterized in that, establish an objective function to characterize the contact sealing effect between the end face of the chuck and the end face of the blade tenon in the working state after implementing axial coordinate adjustment on each node on the mating end face of the chuck to form a new mating end face shape, use a genetic algorithm to search for the axial coordinate adjustment amounts implemented on each node on the mating end face of the chuck that can make the objective function reach the maximum value, and design the mating end face of the chuck based on the axial coordinate adjustment amounts implemented on each node on the mating end face of the chuck.
5. The design method for a chuck according to any one of claims 1 to 3, characterized in that, after designing the mating end face of the chuck based on the axial coordinate adjustment amounts implemented on each node on the mating end face of the chuck, perform a smoothing process on the spline curve of the mating end face of the chuck.
6. A chuck, the chuck being used to restrict the axial movement of a blade tenon in the working state where the chuck and the blade tenon rotate, the mating end face of the chuck is designed such that in the working state where the chuck and the blade tenon rotate, it is in an overall substantially contacting state with the end face of the blade tenon.
7. The chuck according to claim 6, characterized in that, the chuck is arranged on a labyrinth disc included in an aeroengine, the blade tenon is a component included in the aeroengine.
8. The chuck according to claim 6, characterized in that, the chuck is arranged on a baffle plate included in an aeroengine, the blade tenon is a component included in the aeroengine.
9. The chuck according to any one of claims 6 to 8, characterized in that, establish an objective function to characterize the contact sealing effect between the end face of the chuck and the end face of the blade tenon in the working state after implementing axial coordinate adjustment on each node on the mating end face of the chuck to form a new mating end face shape, use a genetic algorithm to search for the axial coordinate adjustment amounts implemented on each node on the mating end face of the chuck that can make the objective function reach the maximum value, and design the mating end face of the chuck based on the axial coordinate adjustment amounts implemented on each node on the mating end face of the chuck.
10. The chuck according to any one of claims 6 to 8, characterized in that, After designing the mating end face of the jaw based on the axial coordinate adjustment amounts implemented for each node on the mating end face of the jaw, a smoothing process is performed on the spline curve of the mating end face of the jaw.
11. A computer device, comprising: a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein when the processor executes the computer program, the design method of the jaw according to any one of claims 1 to 5 is implemented.
12. A computer-readable medium having stored thereon a computer program, which when executed by a processor implements the design method of the jaw according to any one of claims 1 to 5.