CN107562995B - Design method of ring beam of platform lifting system - Google Patents
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Abstract
The invention discloses a design method of a ring beam of a platform lifting system, and belongs to the field of lifting platform design. The design method comprises the steps of constructing an initial geometric model of the ring beam, setting material attributes, setting topological optimization design variables, topological optimization constraint conditions and topological optimization targets, carrying out topological optimization on the initial geometric model to obtain a topological optimization model, constructing an initial box body model of the ring beam according to the outline of the topological optimization model, setting the thickness of an initial material, carrying out static strength analysis and stability analysis on the initial box body model to obtain the stress distribution, rigidity and stability of the initial box body model, and carrying out structural optimization on the initial box body model according to the stress distribution, rigidity and stability to obtain an optimal model, so that the ring beam can be processed according to the optimal model, the processes of repeated design and check in the traditional design method are avoided, the design period is shortened, and the design efficiency is improved.
Description
Technical Field
The invention relates to the field of lifting platform design, in particular to a design method of a ring beam of a platform lifting system.
Background
The ring beam is an important supporting part of the lifting platform and plays a role of a bearing platform lifting system. In designing a platform hoist system, the design for the ring beam is an important part.
The conventional design method includes obtaining an initialized geometric model of the ring beam according to an empirical analogy configuration, determining the size of the ring beam according to previous design experience, or performing analogy according to the structure of the existing ring beam to determine the size of the ring beam, performing checking after determining each size of the ring beam, and if the checking is not qualified, re-determining the size of the ring beam, for example, increasing or decreasing the size through experience, and performing the checking again until the size is qualified.
Due to the lack of directionality, the design process can only obtain the final design through repeated design and check, so that the whole design period is very long, and the designed ring beam also has the defects of heavy weight and heavy structure, and the performance of the lifting platform is influenced.
Disclosure of Invention
In order to solve the problem that the existing ring beam design method is long in design period, the embodiment of the invention provides a design method of a ring beam of a platform lifting system. The technical scheme is as follows:
a method of designing a ring beam for a platform hoist system, the method comprising:
constructing an initial geometric model of the ring beam;
setting material properties;
setting a topological optimization design variable, a topological optimization constraint condition and a topological optimization target, and carrying out topological optimization on the initial geometric model to obtain a topological optimization model;
constructing an initial box body model of the ring beam according to the contour of the topological optimization model;
setting the thickness of an initial material;
performing static strength analysis and stability analysis on the initial box body model to obtain the stress distribution, rigidity and stability of the initial box body model;
and carrying out structural optimization on the initial box body model according to the stress distribution, the rigidity and the stability so as to obtain an optimal model.
Preferably, the constructing an initial geometric model of the ring beam comprises:
setting structural appearance and dimension parameters of the ring beam;
and generating an initial geometric model of the ring beam according to the structural shape and the dimension parameters.
Further, the static strength analysis and stability analysis of the initial box model includes:
setting load parameters of the ring beam in a storm environment;
and carrying out static strength analysis and stability analysis on the initial box body model according to the load data.
Preferably, the design method further comprises:
and checking the structural performance of the optimal model under all working conditions, wherein the all working conditions comprise a windless working condition and a storm working condition, and the structural performance comprises at least one of strength, rigidity and stability.
Preferably, the topological optimization design variable is material distribution, the topological optimization constraint condition is allowable stress of the material, and the topological optimization target is the lightest total weight.
Optionally, the structural optimization includes at least one of material thickness optimization, rib shape optimization, and rib position optimization.
Preferably, the optimization constraint of the structural optimization is a structural property, and the optimization goal of the structural optimization is that the total weight is lightest, wherein the structural property comprises at least one of strength, rigidity and stability.
Further, the structural optimization further comprises weld optimization, wherein the optimization constraint condition of the weld optimization is structural performance, the optimization target of the weld optimization is that the total length of the weld is minimum, and the optimization design variable is the position of the weld, wherein the structural performance comprises at least one of strength, rigidity and stability.
Optionally, the initial geometric model is a quarter model, and the ring beam comprises the same four quarter models arranged circumferentially.
Optionally, the material property comprises at least one of density, modulus of elasticity, and poisson's ratio.
The technical scheme provided by the embodiment of the invention has the following beneficial effects: the method comprises the steps of firstly establishing an initial geometric model, setting material attributes, topological optimization design variables, topological optimization constraint conditions and topological optimization targets, so that topological optimization can be performed on the initial geometric model to obtain a topological optimization model, obtaining the appearance outline of the ring beam through the topological optimization model, avoiding the defect of heavy structure easily caused by design according to empirical analogy, establishing an initial box body model according to the topological optimization model, performing static strength analysis and stability analysis on the initial box body model through setting the initial material thickness of the initial box body model, performing structural optimization on the initial box body model according to the static strength analysis and stability analysis results to obtain an optimal model, machining the ring beam according to the optimal model, ensuring that the designed ring beam meets the design requirements, and avoiding repeated design, repeated design and the like in the traditional design method, And in the checking process, the design period is shortened, and the design efficiency is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of a method for designing a ring beam of a platform lifting system according to an embodiment of the present invention;
FIG. 2 is a flow chart of another method for designing a ring beam of a platform lift system according to an embodiment of the present invention;
FIG. 3 is a diagram of a quarter model according to an embodiment of the present invention;
FIG. 4 is a front view of a topology optimization model provided by an embodiment of the present invention;
FIG. 5 is a top view of a topology optimization model provided by an embodiment of the present invention;
FIG. 6 is a schematic diagram of an initial tank model provided by an embodiment of the present invention;
FIG. 7 is a schematic diagram of an optimization model provided by an embodiment of the invention;
fig. 8 is a schematic diagram of a ring beam model according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 is a flowchart of a method for designing a ring beam of a platform lifting system according to an embodiment of the present invention, where as shown in fig. 1, the method includes:
s11: an initial geometric model of the ring beam is constructed.
S12: the material properties are set.
S13: setting a topological optimization design variable, a topological optimization constraint condition and a topological optimization target, and carrying out topological optimization on the initial geometric model to obtain a topological optimization model.
S14: and constructing an initial box body model of the ring beam according to the contour of the topological optimization model.
S15: the initial material thickness is set.
S16: and carrying out static strength analysis and stability analysis on the initial box model to obtain the stress distribution, rigidity and stability of the initial box model.
S17: and carrying out structural optimization on the initial box body model according to the stress distribution, the rigidity and the stability so as to obtain an optimal model.
According to the embodiment of the invention, an initial geometric model is established first, and material attributes, topological optimization design variables, topological optimization constraint conditions and topological optimization targets are set, so that a topological optimization model can be obtained by carrying out topological optimization on the initial geometric model, the appearance outline of the ring beam can be obtained by the topological optimization model, the defect of heavy structure easily caused by design according to empirical analogy is avoided, an initial box body model is established according to the topological optimization model, the static strength analysis and stability analysis can be carried out on the initial box body model by setting the initial material thickness of the initial box body model, the initial box body model is structurally optimized according to the static strength analysis and stability analysis results to obtain an optimal model, the ring beam can be processed according to the optimal model, the designed ring beam is ensured to meet the design requirement, and repeated design, topological optimization and the like in the traditional design method are avoided, And in the checking process, the design period is shortened, and the design efficiency is improved.
Fig. 2 is a flowchart of another design method for a ring beam of a platform lifting system according to an embodiment of the present invention, as shown in fig. 2, the design method includes:
s21: and setting the structural appearance and dimension parameters of the ring beam.
S22: and generating an initial geometric model of the ring beam according to the structural shape and the size parameters.
Preferably, the initial geometric model is a quarter model, the ring beam comprising four identical quarter models arranged circumferentially. Fig. 3 is a schematic diagram of a quarter model provided by an embodiment of the present invention, where the ring beam is symmetrical about two orthogonal vertical planes, so that the ring beam can be divided into four identical parts, and only the quarter model in the ring beam can be designed for simplifying the model and improving the design efficiency.
Specifically, the structure and the size parameters of the ring beam may also be different for different ocean platforms, wherein the structure of the ring beam may include the spatial position relationship of the pin hole 11 and the lifting cylinder seat 12 on the ring beam.
In implementation, the initial geometric model may be a solid model.
S23: the material properties are set.
Specifically, the material property may include at least one of density, elastic modulus, and poisson's ratio, and the material property may be manually input according to actual needs.
S24: setting a topological optimization design variable, a topological optimization constraint condition and a topological optimization target.
Specifically, the topology optimization design variable may be material distribution, the topology optimization constraint may be allowable stress of the material, and the topology optimization objective may be the lightest total weight.
S25: and carrying out topology optimization on the initial geometric model to obtain a topology optimization model.
Fig. 4 is a front view of a topology optimization model provided by an embodiment of the present invention, and fig. 5 is a top view of the topology optimization model provided by the embodiment of the present invention, through which an outline of a ring beam can be determined, which is convenient for subsequent design of the ring beam.
Specifically, when topology optimization is performed, the region outside the bolt hole and the lifting cylinder base is used as a topology optimization region to perform topology optimization, so that the shape, size and position of the bolt hole and the position of the lifting cylinder base are prevented from changing in the topology optimization process.
S26: the method comprises the steps of constructing an initial box body model of a ring beam according to the outline of a topological optimization model, surveying and mapping the size of the topological optimization model, selecting a ship-level steel plate for the ring beam, designing the ship-level steel plate into a welded initial box body model, enabling the shape and the size of the initial box body model to be consistent with those of the topological optimization model, and reserving holes for installing bolts and lifting oil cylinder seats on the initial box body model.
Fig. 6 is a schematic view of an initial tank model according to an embodiment of the present invention, and as shown in fig. 6, the ring beam is generally designed as a tank structure since the tank structure is light in weight and has excellent bending and torsion resistance.
S27: the initial material thickness is set.
Specifically, the initial material thickness may be obtained from empirical or similarly structured ring beam analogy. The initial material thickness comprises the thickness of each steel plate in the initial box body model, and the steel plates in the initial box body model comprise steel plates which are enclosed into a box body structure and steel plates which are connected inside the box body structure and used as rib plates.
S28: and setting load parameters of the ring beam in a storm environment.
When the forecast storm exceeds the designed working environment, the platform stops working and enters the storm self-storage working condition, at the moment, the platform is subjected to extremely large vertical load and horizontal load, and the working condition is the worst working condition of the ring beam.
The storm environment is the worst environment in the working process of the ocean platform, the load borne by the ring beam is the largest in the storm environment, and the ring beam can adapt to the worst working environment in the actual working process by selecting the load parameters in the storm environment for design, so that the reliability of the ring beam is improved.
During implementation, the load parameters of the ring beam in the storm environment can be manually input, and the setting can be specifically carried out according to the load parameters of the ring beam collected when the existing ocean platform works in the storm environment.
S29: and carrying out static strength analysis and stability analysis on the initial box model to obtain the stress distribution, rigidity and stability of the initial box model.
Specifically, the initial box model may be analyzed by a finite element analysis method to obtain stress distribution on the initial box model and rigidity and stability of the initial box model, so as to facilitate subsequent further optimization.
S30: and performing structural optimization on the initial box body model according to the stress distribution, the rigidity and the stability to obtain an optimal model (as shown in figure 7).
Note that, in fig. 7, a part of the structure is removed in order to show the internal structure.
Specifically, the structural optimization may include at least one of material thickness optimization, rib shape optimization, and rib position optimization.
When the structure optimization is realized, the optimization constraint condition of the structure optimization is the structural performance, and the optimization goal of the structure optimization is that the total weight is the lightest, wherein the structural performance comprises at least one of strength, rigidity and stability.
Specifically, the method takes strength, rigidity and stability as optimization constraint conditions, takes the lightest total weight as an optimization target, and takes material thickness as an optimization variable to optimize the material thickness, wherein the material thickness comprises the thickness of each steel plate in an initial box model, and the thickness comprises the steel plates which surround a box structure and the steel plates which are connected inside the box structure and used as rib plates.
And (3) optimizing the shape of the rib plate by taking the strength, the rigidity and the stability as optimization constraint conditions, taking the lightest total weight as an optimization target and taking the shape of the rib plate as an optimization variable.
And (3) optimizing the position of the rib plate by taking the strength, the rigidity and the stability as optimization constraint conditions, taking the lightest total weight as an optimization target and taking the position of the rib plate as an optimization variable.
The light weight of the ring beam can be realized through structural optimization, and the total weight of the ring beam is reduced on the premise of meeting design requirements.
Further, the structural optimization may further include weld optimization, where the optimization constraint condition of the weld optimization is structural performance, the optimization goal of the weld optimization is that the total length of the weld is minimum, and the optimization design variable is a weld position, where the structural performance includes at least one of strength, rigidity, and stability. The total length of the weld can be reduced through weld optimization, so that the welding workload is reduced, and meanwhile, the welding deformation can be favorably reduced due to the reduction of the welding length, so that the changes of structural strength, rigidity and stability caused by the welding deformation are reduced.
S31: and carrying out structural performance checking on the optimal model under all working conditions.
Wherein, the full operating mode includes no wind operating mode and storm operating mode, and structural performance includes at least one of intensity, rigidity and stability.
Specifically, the windless working conditions comprise a towing working condition, a lifting pile leg working condition, a pre-loading working condition, a lifting platform working condition and a standing working condition, the storm working conditions comprise a storm self-storage working condition, and the reliability of the designed ring beam structure is improved by checking the structural performance of the optimal model under each working condition.
The optimal model can be ensured to meet the design requirements by checking the structural performance of the optimal model under all working conditions. If the optimal model is unqualified in the structural performance check, a rib plate can be added in the optimal model, and the step S30 is returned to for rib plate shape optimization or rib plate position optimization.
Fig. 8 is a schematic diagram of a ring beam model according to an embodiment of the present invention, and after the optimal model is checked to be qualified, a complete ring beam model can be constructed according to the optimal model, and the ring beam model is used for design and production.
In the one-pass ring beam design using the method shown in fig. 2, the weight of the ring beam model after setting the initial material thickness (step S27) reaches 8.11 tons (the sum of the weights of the 4 initial tank models), which is reduced by 0.62 tons compared with the empirically designed ring beam model, and after the design is completed (step S31 is completed), the weight of the ring beam model is reduced to 7.64 tons, the weight reduction rate reaches 5.8%, and the weight reduction rate reaches 12.5% compared with the empirically designed ring beam model, which greatly reduces the total weight of the ring beam.
It should be noted that all or part of the steps of the above embodiments can be implemented by commonly used design software, such as ANSYS, ABAQUS, and the like.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. A method of designing a ring beam for a platform hoist system, the method comprising:
constructing an initial geometric model of a ring beam, wherein the initial geometric model is a quarter model, and the ring beam comprises four identical quarter models which are circumferentially arranged;
setting material properties;
setting a topological optimization design variable, a topological optimization constraint condition and a topological optimization target, and carrying out topological optimization on the initial geometric model to obtain a topological optimization model;
constructing an initial box body model of a ring beam according to the outline of the topological optimization model, mapping the size of the topological optimization model, selecting a ship-level steel plate for the ring beam, designing the ship-level steel plate into the welded initial box body model, enabling the shape and the size of the initial box body model to be consistent with those of the topological optimization model, and reserving holes for installing bolts and lifting oil cylinder seats on the initial box body model;
setting the thickness of an initial material;
performing static strength analysis and stability analysis on the initial box body model to obtain the stress distribution, rigidity and stability of the initial box body model;
performing structural optimization on the initial box body model according to the stress distribution, the rigidity and the stability to obtain an optimal model, wherein the structural optimization at least comprises weld optimization, material thickness optimization, rib plate shape optimization and rib plate position optimization, the optimization constraint condition of the weld optimization is structural performance, the optimization target of the weld optimization is the minimum total length of the weld, and the optimization design variable is the position of the weld, wherein the structural performance comprises at least one of strength, rigidity and stability,
the material thickness optimization takes strength, rigidity and stability as optimization constraint conditions, takes the lightest total weight as an optimization target, and takes the material thickness as an optimization variable, wherein the material thickness comprises the thickness of each steel plate in an initial box model, and the thickness comprises the steel plates which surround a box structure and the steel plates which are connected inside the box structure and used as rib plates;
the shape optimization of the rib plates takes strength, rigidity and stability as optimization constraint conditions, takes the lightest total weight as an optimization target, and takes the shape of the rib plates as an optimization variable;
the rib plate position optimization takes strength, rigidity and stability as optimization constraint conditions, takes the lightest total weight as an optimization target, and takes the rib plate position as an optimization variable.
2. The design method of claim 1, wherein said constructing an initial geometric model of a ring beam comprises:
setting structural appearance and dimension parameters of the ring beam;
and generating an initial geometric model of the ring beam according to the structural shape and the dimension parameters.
3. The design method of claim 1, wherein the performing the static strength analysis and the stability analysis on the initial tank model comprises:
setting load parameters of the ring beam in a storm environment;
and carrying out static strength analysis and stability analysis on the initial box body model according to the load data.
4. The design method of claim 1, further comprising:
and checking the structural performance of the optimal model under all working conditions, wherein the all working conditions comprise a windless working condition and a storm working condition, and the structural performance comprises at least one of strength, rigidity and stability.
5. The design method according to any one of claims 1 to 4, wherein the topological optimization design variable is material distribution, the topological optimization constraint condition is allowable stress of the material, and the topological optimization goal is lightest total weight.
6. The design method of claim 1, wherein the optimization constraint of the structural optimization is structural performance, and the optimization goal of the structural optimization is that the total weight is the lightest, wherein the structural performance comprises at least one of strength, rigidity and stability.
7. A design method according to any one of claims 1 to 4, wherein the material properties comprise at least one of density, modulus of elasticity and Poisson's ratio.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105243240A (en) * | 2015-11-10 | 2016-01-13 | 上海理工大学 | Optimization design method for high-steel light machine tool large part structure |
| CN106021797A (en) * | 2016-06-02 | 2016-10-12 | 武汉船用机械有限责任公司 | Design method for crane ring beam |
| CN106326573A (en) * | 2016-08-26 | 2017-01-11 | 武汉船用机械有限责任公司 | Design method of suspension arm of crane |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105243240A (en) * | 2015-11-10 | 2016-01-13 | 上海理工大学 | Optimization design method for high-steel light machine tool large part structure |
| CN106021797A (en) * | 2016-06-02 | 2016-10-12 | 武汉船用机械有限责任公司 | Design method for crane ring beam |
| CN106326573A (en) * | 2016-08-26 | 2017-01-11 | 武汉船用机械有限责任公司 | Design method of suspension arm of crane |
Non-Patent Citations (1)
| Title |
|---|
| 起重机箱型量的预应力研究;黄旻舒;《中国优秀硕士学位论文全文数据库工程科技II辑》;20040415;第C029-187页 * |
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