CN109325256B - Design method of primary and secondary connection section structure with uniform bias load boosting stress - Google Patents
Design method of primary and secondary connection section structure with uniform bias load boosting stress Download PDFInfo
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Abstract
The design method of the secondary connection section structure with uniform bias load boosting stress comprises the steps of firstly, fully filling an internal energy optimization design area of a structure envelope by adopting entity units to obtain a basic force transmission path of the structure, then establishing an initial model for topological optimization of a shell model by combining the material distribution characteristics of an entity model optimization result, a manufacturing process, installation spacing and other requirements, and applying uniform boosting stress constraint in the optimization process of the shell model; then, establishing a frame truss structure model by referring to an optimization result of the shell model and carrying out further size optimization; and then establishing a reinforced shell model according to the size optimization result, the manufacturing process and other requirements, further optimizing the size, finally analyzing the optimization result under other working conditions, and determining that the structural simulation analysis result can meet the structural design requirement.
Description
Technical Field
The invention relates to a structural design of a secondary connecting section of a bound carrier rocket, in particular to a structural design method of a secondary connecting section with uniform bias load boosting stress.
Background
The booster is one of important means for improving the carrying capacity of the rocket, and is widely applied to modern carrier rockets. Because the booster is bound with the core stage, a structure for bearing the offset load is inevitably available. If the structural design of the nose cone is not optimized enough, the action of the offset load can be transferred to the booster, so that the stress on the inner side and the outer side of the booster is uneven, and the inconvenience is caused to the modular design of the booster. Therefore, a secondary connection section needs to be optimally designed.
In the design method of the secondary connection section structure in the current stage, the structure configuration and the size are directly determined by adopting an engineering algorithm according to the requirements of load, strength and rigidity, and finally simulation analysis is carried out, and the design parameters are adjusted according to the analysis result to realize iterative optimization. The design process has a good implementation effect on a rocket structure with uniform force transmission of the cabin section, but the structural optimization design of the structural cabin under the action of the offset load cannot be achieved.
Disclosure of Invention
The invention aims to provide a design method of a secondary connecting section structure with uniform boosting stress of a bias load, which is used for obtaining the secondary connecting section structure which can ensure that the boosting keeps uniform stress under the action of the bias load.
In order to achieve the above object, the present invention provides a method for designing a secondary connection section structure with uniform bias load boosting stress, comprising: 1) Determining the inner envelope and the outer envelope of a secondary connection section structure and the working condition according to the input conditions; 2) Determining an optimal design area in the structural envelope, filling the optimal design area with entity units to obtain an entity model, and performing maximum stiffness topological optimization on the entity model by using a variable density optimization method; 3) Determining a basic force transmission path of the structure according to the entity model topology optimization result, and abstracting a shell model by referring to the material distribution characteristics of the entity model topology optimization result; 4) Filling an optimal design area in a shell model by adopting shell units, then performing maximum rigidity topological optimization on the shell model by using a variable density optimization method, and considering the constraint of applying boosting force and uniform stress in the optimization; 5) Determining a detailed force transmission path of the structure according to the shell model topology optimization result, and abstracting a frame truss structure by referring to the material distribution characteristics of the shell model topology optimization result; 6) Carrying out size optimization on the frame truss structure to obtain an optimal size model of the frame truss structure, and applying constraints of boosting stress uniformity and displacement constraints in the optimization; 7) Determining the space between the structural frames and establishing a reinforced shell model by combining an engineering algorithm and structural simulation according to the requirements of the process and manufacturing tooling equipment on the basis of the optimal size model of the frame truss structure; 8) And (4) carrying out size optimization on the reinforced shell model to obtain an optimized secondary connection section structure model, and applying constraint and displacement constraint for boosting stress uniformity in optimization.
In the step 2), if the material distribution characteristics of the entity model topology optimization result are not obvious, the optimization model is adjusted, and the step 2) is repeated until the material distribution characteristics of the obtained entity model topology optimization result are obvious.
The design method of the structure of the secondary connection section with uniform bias load boosting stress is characterized in that the step 3) further comprises the step of adjusting the abstracted shell model according to the separation scheme and the installation distance requirement of the structure.
In the step 4), if the material distribution characteristics of the topology optimization result of the shell model are not obvious, the optimization model is adjusted, and the step 4) is repeated until the material distribution characteristics of the topology optimization result of the shell model are obvious.
According to the design method of the two-stage connection section structure with uniform bias load boosting stress, in the topological optimization of the shell model, the connection structure between the core stage and the nose cone only keeps transverse connection and does not transmit axial force.
The design method of the secondary connection section structure with uniform bias load boosting stress is characterized in that in the step 6) and the step 8), the size optimization target is the minimization of the model weight.
In the above design method for the secondary connection section structure with uniform bias load boosting stress, in the step 4), the step 6) and the step 8), the design requirement for uniform boosting stress is realized by keeping the Mises stress of the circle of unit on the front end face of the storage box within a reasonable deviation range.
The design method of the structure of the secondary connection section with uniform bias load boosting stress further comprises the following steps:
9) And (3) carrying out multi-working-condition analysis on the secondary connection section structure model obtained in the step 8), and determining that the structure simulation analysis result can meet the structure design requirement.
Compared with the prior art, the invention has the beneficial technical effects that:
through the designed secondary connection section structure, the axial stress of other sections of the booster except the secondary connection section is uniform, the quality of structural design of other parts of the booster can be reduced, and meanwhile, the module exchange of the structure between boosting can be realized.
Drawings
The design method of the structure of the secondary connection section with uniform bias load boosting stress is provided by the following embodiments and attached drawings.
FIG. 1 is a schematic diagram of the inner and outer envelopes of a two-stage connection structure according to the preferred embodiment of the present invention.
FIG. 2 is a diagram illustrating the result of the topology optimization of the solid model according to the preferred embodiment of the present invention.
FIG. 3 is a schematic view of a shell model in a preferred embodiment of the present invention.
FIG. 4 is a schematic view of a frame truss structure in accordance with a preferred embodiment of the present invention.
FIG. 5 is a schematic diagram of a two-stage connection segment structure model optimized according to the preferred embodiment of the present invention.
Detailed Description
The design method of the present invention for a secondary connection section structure with uniform bias load boosting force will be described in further detail with reference to fig. 1 to 5.
The design method of the secondary connection section structure with uniform bias load boosting stress applies a topology optimization technology to the conceptual design and the dimensional design of the structure, and obtains the secondary connection section structure which can also ensure that the boosting keeps uniform stress under the action of the bias load by applying uniform stress constraint on the boosting in the optimization process.
The design method of the structure of the secondary connection section with uniform bias load boosting stress of the preferred embodiment of the invention comprises the following steps:
1) Determining the inner envelope and the outer envelope of a secondary connection section structure and the most severe design working condition according to input conditions;
the input conditions comprise arrow body installation space requirement conditions and engine thrust load conditions;
FIG. 1 is a schematic diagram of the inner and outer envelopes of a secondary connection segment structure in a preferred embodiment of the present invention, wherein (a) is the overall envelope and (b) is the 1/4 envelope; referring to fig. 1, the envelope includes an optimized design region envelope 1, a transition section envelope 2 and a partial booster envelope 3, and in consideration of structural symmetry, in order to simplify calculation amount and save calculation time, the implementation takes 1/4 of the envelope for optimized design, as (b);
in this embodiment, the determined working conditions are: the top end of the transition section is fixed, the bottom of each booster is applied with an axial load of 1000T, and the load borne by the outer booster under the working condition is a bias load;
2) Determining an optimal design area in the structural envelope, filling the optimal design area with entity units to obtain an entity model, and performing maximum stiffness topological optimization on the entity model by using a variable density optimization method;
in this embodiment, an envelope 1 of an optimal design area in fig. 1 is an optimal design area, and the optimal design area is fully filled with entity units to obtain an entity model;
if the material distribution characteristics of the entity model topology optimization result are not obvious, adjusting the entity model, and repeating the step 2) until the material distribution characteristics of the obtained entity model topology optimization result are obvious, namely obtaining an ideal entity model topology optimization result through iterative optimization;
FIG. 2 is a diagram illustrating the result of the topology optimization of the solid model according to the preferred embodiment of the present invention;
the maximum stiffness topology optimization of the solid model by applying the variable density optimization method can adopt the prior art, the optimization process is not described in detail in the embodiment, but the implementation of the embodiment is not influenced;
3) Determining a basic force transmission path of the structure according to the entity model topology optimization result, and abstracting a shell model by referring to the material distribution characteristics of the entity model topology optimization result; adjusting the shell model according to the requirements of a separation scheme, installation spacing and the like of the structure;
FIG. 3 is a schematic diagram of a shell model according to a preferred embodiment of the present invention, which includes a transition section shell model 2', an oblique nose cone shell model 4, a core-stage shell model 5, a core-stage and nose cone connection structure design space 6, a circle of units (i.e. a row of units for restraining Mises stress) 7 on the front end face of a storage tank, and a partial booster shell model 3'; as can be seen from fig. 3, in the present embodiment, the connection structure between the core stage and the nose cone only retains the transverse connection, and does not transmit the axial force;
4) Filling an optimal design area in a shell model by adopting shell units, then performing maximum rigidity topological optimization on the shell model by using a variable density optimization method, and considering the constraint of applying boosting force and uniform stress in the optimization;
filling the optimized design area (an oblique head conical shell model 4, a core-level shell model 5, a connection structure design space 6 between a core level and a head cone, and a circle of units 7 on the front end surface of the storage tank in the figure 3) of the shell model obtained in the step 3) by adopting shell units, and then applying a variable density optimization method to carry out maximum rigidity topological optimization on the shell model after the shell units are filled;
in the embodiment, the boosting stress uniform constraint application mode is to constrain the Mises stress of a circle of units 7 (see figure 3) on the front end face of the storage box to be 100-110 MPa;
if the material distribution characteristics of the shell model topology optimization result are not obvious, adjusting the optimized shell model, and repeating the step 4) until the material distribution characteristics of the obtained shell model topology optimization result are obvious, namely obtaining an ideal shell model topology optimization result through iterative optimization;
5) Determining a detailed force transmission path of the structure according to the shell model topology optimization result, and abstracting a frame truss structure by referring to the material distribution characteristics of the shell model topology optimization result;
compared with the entity model topology optimization result, the shell model topology optimization result can obtain a more detailed force transmission path; the basic force transmission path and the detailed force transmission path are compared with each other;
FIG. 4 is a schematic view of the frame truss structure in the preferred embodiment of the present invention, and as shown in FIG. 4, the connecting rod design space 6 (see FIG. 3) is optimized to obtain the connecting rod 8, and the connecting rod 8 can balance the bending moment caused by the biasing force;
6) Carrying out size optimization on the frame and truss structure, wherein the optimization target is the minimization of the weight of the model to obtain an optimal size model of the frame and truss structure, and applying the uniform constraint and displacement constraint of boosting stress in the optimization;
the boosting stress uniform constraint application mode is to constrain the stress of one circle of unit Mises on the front end surface of the storage box to be 100-110 MPa;
7) Determining the space between the structural frames and establishing a reinforced shell model according to the requirements of the process, manufacturing tooling equipment and the like and by combining engineering algorithm and structural simulation on the basis of the optimal size model of the frame truss structure;
8) Optimizing the size of the reinforced shell model, wherein the optimization target is the minimization of the weight of the model, finally obtaining an optimized secondary connection section structure model, and applying the restraint of boosting stress uniformity and displacement restraint in the optimization;
the boosting stress uniform constraint application mode is to constrain the stress of one circle of unit Mises at 100-110 MPa on the front end face of the storage box;
FIG. 5 is a schematic diagram of a second-level connection segment structure model optimized in the preferred embodiment of the present invention;
9) And (5) analyzing the primary and secondary connection section structure model obtained in the step 8) under multiple working conditions, and determining that the structure simulation analysis result can meet the structural design requirement.
The invention relates to a design and optimization method for a secondary connection section structure with uniform boosting stress under the action of a bias load. Firstly, fully filling an internal energy optimization design area of a structure envelope by adopting an entity unit to obtain a basic force transmission path of the structure, then establishing an initial model for topological optimization of a shell model by combining the material distribution characteristics of an entity model optimization result, the manufacturing process, the installation interval and other requirements, and applying the restraint of uniform boosting stress in the optimization process of the shell model; then, establishing a frame truss structure model by referring to an optimization result of the shell model and carrying out further size optimization; and then establishing a reinforced shell model according to the size optimization result, the manufacturing process and other requirements, further optimizing the size, finally analyzing the optimization result under other working conditions, and determining that the structural simulation analysis result can meet the structural design requirement.
Aiming at the verification of the embodiment of the invention, the force transmission path of the secondary connection section structure obtained by the design optimization of the method is reasonable, and the requirement of uniform boosting stress can be realized. The method of the invention is a necessary supplement and improvement for the structural design and optimization method of the existing carrier rocket bearing offset load, and the implementation mode of the boosting stress uniform constraint in the invention is a simple and effective mode, and provides reference for realizing similar uniformity requirements in the structural design.
The design method of the two-stage connection section structure with uniform bias load boosting stress can provide guidance for the structural design of a cabin bearing the bias load, and can be widely applied to a spacecraft structure bearing the bias load.
Claims (8)
1. The design method of the structure of the primary and secondary connection sections with uniform bias load boosting stress is characterized by comprising the following steps:
1) Determining the inner envelope and the outer envelope of a secondary connection section structure and the working condition according to the input conditions;
2) Determining an optimal design area in the structural envelope, filling the optimal design area with entity units to obtain an entity model, and performing maximum stiffness topological optimization on the entity model by using a variable density optimization method;
3) Determining a basic force transmission path of the structure according to the entity model topology optimization result, and abstracting a shell model by referring to the material distribution characteristics of the entity model topology optimization result;
4) Filling an optimal design area in a shell model by adopting shell units, then performing maximum rigidity topological optimization on the shell model by using a variable density optimization method, and considering the constraint of applying boosting force and uniform stress in the optimization;
5) Determining a detailed force transmission path of the structure according to the shell model topology optimization result, and abstracting a frame truss structure by referring to the material distribution characteristics of the shell model topology optimization result;
6) Carrying out size optimization on the frame and truss structure to obtain an optimal size model of the frame and truss structure, and applying constraints of boosting stress uniformity and displacement constraints in the optimization;
7) Determining the space between the structural frames and establishing a reinforced shell model by combining an engineering algorithm and structural simulation according to the requirements of the process and manufacturing tooling equipment on the basis of the optimal size model of the frame truss structure;
8) And (4) carrying out size optimization on the reinforced shell model to obtain an optimized secondary connection section structure model, and applying the restraint of uniform boosting stress and displacement restraint in the optimization.
2. The method for designing a secondary connection section structure with uniform bias load boosting stress according to claim 1, wherein in the step 2), if the material distribution characteristics of the entity model topology optimization result are not obvious, the optimization model is adjusted, and the step 2) is repeated until the material distribution characteristics of the obtained entity model topology optimization result are obvious.
3. The design method of a secondary connection section structure with uniform bias load boosting stress according to claim 1, wherein the step 3) further comprises adjusting the abstracted shell model according to the separation scheme and installation spacing requirements of the structure.
4. The method for designing a secondary connection section structure with uniform bias load boosting stress according to claim 1, wherein in the step 4), if the material distribution characteristics of the topology optimization result of the shell model are not obvious, the optimization model is adjusted, and the step 4) is repeated until the material distribution characteristics of the topology optimization result of the obtained shell model are obvious.
5. The method for designing a two-stage connection section structure with uniform bias load boosting stress according to claim 1, wherein in the topology optimization of a shell model, only transverse connection of the connection structure between the core stage and the nose cone is reserved, and no axial force is transmitted.
6. The design method of a secondary connection section structure with uniform bias load boosting force according to claim 1, wherein in the step 6) and the step 8), the size optimization goal is to minimize the model weight.
7. The design method of the secondary connection section structure with uniform bias load boosting stress as claimed in claim 1, wherein in the step 4), the step 6) and the step 8), the design requirement of uniform boosting stress is realized by keeping the Mises stress of a circle of units on the front end face of the storage tank within the deviation range of the technical requirement.
8. The design method of a secondary connection section structure with uniform bias load boosting force according to claim 1, characterized by further comprising:
9) And (3) carrying out multi-working-condition analysis on the secondary connection section structure model obtained in the step 8), and determining that the structure simulation analysis result can meet the structure design requirement.
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| CN115408780B (en) * | 2022-11-01 | 2023-03-28 | 北京宇航系统工程研究所 | Core-level arrow body structure design method for directional decoupling of force and moment and core-level arrow body |
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| CN106650045A (en) * | 2016-12-05 | 2017-05-10 | 大连理工大学 | Optimized design and strength analysis method of secondary box section structure |
| CN106777617A (en) * | 2016-12-05 | 2017-05-31 | 大连理工大学 | A kind of two grades of inter-tank section optimum structure design methods |
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