CN113361038A - Converter lightweight method, system, server and computer readable storage medium - Google Patents
Converter lightweight method, system, server and computer readable storage medium Download PDFInfo
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- CN113361038A CN113361038A CN202110668795.3A CN202110668795A CN113361038A CN 113361038 A CN113361038 A CN 113361038A CN 202110668795 A CN202110668795 A CN 202110668795A CN 113361038 A CN113361038 A CN 113361038A
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- G06F30/00—Computer-aided design [CAD]
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- G06F30/15—Vehicle, aircraft or watercraft design
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- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- G06F2111/06—Multi-objective optimisation, e.g. Pareto optimisation using simulated annealing [SA], ant colony algorithms or genetic algorithms [GA]
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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Y02T10/10—Internal combustion engine [ICE] based vehicles
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Abstract
The application discloses a converter lightweight method, a converter lightweight system, a server and a computer readable storage medium, which are used for realizing lightweight design of a converter and promoting lightweight of a whole vehicle. The method comprises the following steps: obtaining an initial cabinet structure design scheme of the converter; carrying out finite element strength simulation analysis on the initial cabinet structure design scheme to obtain an initial simulation analysis result; determining a design variable combination based on a finite element model of an initial cabinet structure design scheme; performing local optimization and/or overall optimization on the initial cabinet structure design scheme according to the design variable combination to obtain an optimized cabinet structure design scheme; carrying out finite element strength simulation analysis on the structural design scheme of the optimized cabinet body to obtain an optimized simulation analysis result; and when the optimized simulation analysis result does not meet the preset design requirement, continuously optimizing the design scheme of the optimized cabinet structure until the final optimized simulation analysis result meets the preset design requirement and the weight of the final optimized cabinet structure is less than that of the initial cabinet structure.
Description
Technical Field
The invention relates to the field of rail transit, in particular to a method and a system for lightening a converter, a server and a computer readable storage medium.
Background
With the rapid development of the railway industry, the improvement of the operation speed is imperative, and higher requirements are put forward on the light weight degree of vehicles. The design of light weight is carried out to the vehicle, not only can practice thrift raw and other materials, more is favorable to the performance of traction power and the improvement of braking performance, has very big effect to improving train operating speed, and the weight of vehicle alleviates simultaneously, can reduce the effort between bogie pair wheel rail, and the suppression vibration and noise have good effect to the life of circuit and the application of vehicle condition.
At present, the light weight design becomes the future development direction and target of the rail transit industry, and the point becomes the consensus in the whole industry. However, how to design light weight becomes a problem of headache in the same general. Taking a converter structure design engineer as an example when the converter structure design work is carried out, the following problems exist:
the design is usually carried out by depending on experience and experimental data of previous products, the severe operation environment and complex working conditions of the rail transit vehicle-mounted converter are considered, the over-design condition generally exists in the structural design, and structural engineers cannot effectively evaluate the stress condition actually borne by a sheet metal part when the designed product is actually operated due to lack of quantitative strength data and a design method, so that the main stress parts such as lifting lugs and main beams are subjected to thickening design, namely over-design;
because most products are subjected to modification design based on previous products and product development work depending on inherent experience, the weight reduction potential of a structural part cannot be deeply excavated during new platform development, generally, the plate thickness is simply changed or materials are simply replaced, the structural form is not essentially different from the previous products, a new structural form cannot be created, and qualitative breakthrough cannot be realized;
the product development period is long, and because structural design and lightweight design are not carried out based on a finite element and optimization method, and product development is carried out by depending on experience and experiments, the problem is found after the prototype experiment of the product is completed, or the weight reduction index is found in the later stage of detailed design of the product and cannot be met, so that the whole product development falls into the cycle of structural design, experiment, optimization and experiment, the development period and time of the whole product are obviously increased, and the product experiment cost and the design cost are increased;
the product lightweight effect is uneven, can't guarantee to satisfy the target completely, because present product lightweight design relies on structural engineer's experience and structural design level completely, leads to some not experienced structural engineer or the engineer of newly going on duty to attenuate some key component after receiving the lightweight demand, leads to follow-up appearance cabinet body vibration not to close or the problem of structure inefficacy.
Therefore, the conventional means cannot solve the problem of light weight design of the traction converter and the like, and cannot promote light weight of the whole vehicle.
Disclosure of Invention
The invention aims to provide a converter lightweight method, a converter lightweight system, a server and a computer readable storage medium, which are used for realizing lightweight design of a converter and promoting lightweight of a whole vehicle.
The invention provides a method for lightening a converter, which comprises the following steps:
obtaining an initial cabinet structure design scheme of the converter;
carrying out finite element strength simulation analysis on the initial cabinet structure design scheme to obtain an initial simulation analysis result;
determining a design variable combination based on a finite element model of an initial cabinet structure design scheme;
performing local optimization and/or overall optimization on the initial cabinet structure design scheme according to the design variable combination to obtain an optimized cabinet structure design scheme;
carrying out finite element strength simulation analysis on the structural design scheme of the optimized cabinet body to obtain an optimized simulation analysis result;
and when the optimized simulation analysis result does not meet the preset design requirement, continuously optimizing the design scheme of the optimized cabinet structure until the final optimized simulation analysis result meets the preset design requirement and the weight of the final optimized cabinet structure is less than that of the initial cabinet structure.
Optionally, finite element strength simulation analysis is performed on the initial cabinet structure design scheme to obtain an initial simulation analysis result, including:
carrying out finite element strength simulation analysis on the static strength working condition, the modal working condition, the random vibration working condition and the transient impact working condition of the initial cabinet body structure design scheme to obtain a simulation analysis result, wherein the simulation analysis result comprises a static analysis result, a modal analysis result, a random vibration analysis result and a transient impact analysis result;
the method further comprises the following steps:
evaluating whether the static strength analysis result, the modal analysis result, the random vibration analysis result and the transient impact analysis result meet the preset design requirement;
if any one of the static strength analysis result, the modal analysis result, the random vibration analysis result and the transient impact analysis result does not meet the preset design requirement, determining that the initial cabinet structure design scheme does not meet the preset design requirement;
and if the static strength analysis result, the modal analysis result, the random vibration analysis result and the transient impact analysis result all meet the preset design requirement, determining that the initial cabinet structure design scheme meets the preset design requirement.
Optionally, determining a design variable combination based on a finite element model of the initial cabinet structure design scheme includes:
determining a finite element model of an initial cabinet structure established in the finite element strength simulation analysis process;
determining a design variable combination based on the finite element model, wherein the design variables in the design variable combination correspond to the design variables in the preset standard one by one, the design variable combination comprises at least two design variables, and each design variable corresponds to a geometric parameter of the structural member to be optimized.
Optionally, the initial cabinet structure design scheme is locally optimized and/or globally optimized according to the design variable combination, so as to obtain an optimized cabinet structure design scheme, including:
carrying out sensitivity analysis on the design variable combination to obtain a sensitivity value of each design variable, and selecting the optimal design parameter of each structural member to be optimized according to the sensitivity value to form an optimal design parameter subset;
local arrangement optimization is carried out on the initial cabinet structure design scheme by adopting a topology optimization technology to obtain an optimal local arrangement optimization result;
or the like, or, alternatively,
carrying out overall size optimization on the initial cabinet structure design scheme according to a size optimization principle to obtain an overall size optimization result;
or the like, or, alternatively,
local arrangement optimization is carried out on the initial cabinet structure design scheme by adopting a topology optimization technology to obtain an optimal local arrangement optimization result, and overall size optimization is carried out according to the optimal local arrangement optimization result to obtain an overall size optimization result;
and when the target component with insufficient rigidity exists in the optimal local arrangement optimization result or the overall size optimization result, performing local rigidity optimization on the target component to obtain an optimized cabinet structure design scheme.
Optionally, performing sensitivity analysis on the design variable combination to obtain a sensitivity value of each design variable, selecting the optimal design parameter of each structural member to be optimized according to the sensitivity value to form an optimal design parameter subset, including:
determining each design variable in the combination of design variables;
generating geometric parameters of the structural part to be optimized corresponding to each design variable into design variables to be optimized, wherein the geometric parameters comprise at least two parameters;
performing sensitivity analysis by combining the random vibration result and the variables to be optimized to obtain the sensitivity value of each variable to be optimized to the fatigue working condition;
and selecting the optimal design parameters of each structural member to be optimized according to the sensitivity value of the fatigue working condition to form an optimal design parameter subset.
Optionally, the local layout optimization is performed on the initial cabinet structure design scheme by using a topology optimization technology, so as to obtain an optimal local layout optimization result, including:
obtaining the optimal material distribution or the optimal force transmission path of a local structure by adopting a topology optimization technology;
performing local arrangement optimization on the local structure according to the optimal material distribution or the optimal force transmission path to obtain at least two local arrangement optimization results;
and carrying out local model simulation analysis comparison on at least two local arrangement optimization results to obtain an optimal local arrangement optimization result.
Optionally, overall dimension optimization is performed on the initial cabinet structure design scheme according to a dimension optimization principle, so as to obtain an overall dimension optimization result, including:
selecting a part to be subjected to size optimization from an initial cabinet structure design scheme according to a size optimization principle;
and performing size optimization on the part to be subjected to size optimization according to three size optimization factors to obtain an overall size optimization result, wherein the three size optimization factors comprise an optimization variable, an optimization constraint and an optimization target, the optimization variable is used for defining thickness data of the part to be subjected to size optimization, the optimization constraint represents that an optimization stress constraint is created according to the type of the material, and the optimization target is the minimum weight of the cabinet body structure.
Optionally, a topology optimization technology is adopted to perform local layout optimization on the initial cabinet structure design scheme to obtain an optimal local layout optimization result, and overall size optimization is performed according to the optimal local layout optimization result to obtain an overall size optimization result, including:
obtaining the optimal material distribution or the optimal force transmission path of a local structure by adopting a topology optimization technology;
performing local arrangement optimization on the local structure according to the optimal material distribution or the optimal force transmission path to obtain at least two local arrangement optimization results;
carrying out local model simulation analysis comparison on at least two local arrangement optimization results to obtain an optimal local arrangement optimization result;
modifying and arranging the local model according to the optimal local arrangement optimization result to obtain a locally optimized cabinet structure design scheme;
selecting a part to be subjected to size optimization from a cabinet body structure design scheme subjected to local optimization according to a size optimization principle;
and performing size optimization on the part to be subjected to size optimization according to three size optimization factors to obtain an overall size optimization result, wherein the three size optimization factors comprise an optimization variable, an optimization constraint and an optimization target, the optimization variable is used for defining thickness data of the part to be subjected to size optimization, the optimization constraint represents that an optimization stress constraint is created according to the type of the material, and the optimization target is the minimum weight of the cabinet body structure.
Optionally, local rigidity optimization is performed on the target component to obtain an optimized cabinet structure design scheme, including:
and when the target part with insufficient rigidity exists in the optimal local arrangement optimization result and/or the overall size optimization result, local rigidity optimization is carried out on the target part by adopting a morphology optimization technology and a section optimization technology to obtain an optimized cabinet structure design scheme.
A second aspect of the present invention provides a converter lightweight system, including:
the acquisition module is used for acquiring an initial cabinet structure design scheme of the converter;
the finite element strength simulation analysis module is used for carrying out finite element strength simulation analysis on the initial cabinet body structure design scheme to obtain an initial simulation analysis result;
the design variable module is used for determining a design variable combination based on a finite element model of an initial cabinet structure design scheme;
the optimization module is used for carrying out local optimization and/or overall optimization on the initial cabinet structure design scheme according to the design variable combination to obtain an optimized cabinet structure design scheme;
the finite element strength simulation analysis module is also used for carrying out finite element strength simulation analysis on the structural design scheme of the optimized cabinet body to obtain an optimized simulation analysis result;
and the optimization module is further used for continuously optimizing the design scheme of the optimized cabinet structure when the optimized simulation analysis result does not meet the preset design requirement until the final optimized simulation analysis result meets the preset design requirement and the weight of the final optimized cabinet structure is smaller than that of the initial cabinet structure.
A third aspect of the present invention provides a server comprising:
a memory, a processor, and a computer program stored in the memory and executable on the processor;
the processor implements the converter weight reduction method according to any one of the first aspect when executing the computer program.
A fourth aspect of the present invention provides a computer-readable storage medium comprising:
a computer program is stored which can be loaded by a processor and which performs the current transformer lightening method as defined in any one of the first aspects.
Therefore, the method for lightening the converter obtains the design scheme of the initial cabinet body structure of the converter, carrying out finite element strength simulation analysis on the initial cabinet structure design scheme to obtain an initial simulation analysis result, determining a design variable combination based on a finite element model of the initial cabinet structure design scheme, carrying out local optimization and/or overall optimization on the initial cabinet structure design scheme according to the design variable combination to obtain an optimized cabinet structure design scheme, carrying out finite element strength simulation analysis on the structural design scheme of the optimized cabinet body to obtain an optimized simulation analysis result, and when the optimized simulation analysis result does not meet the preset design requirement, and continuously optimizing the design scheme of the optimized cabinet body structure until the final optimized simulation analysis result meets the preset design requirement, and the weight of the final optimized cabinet body structure is smaller than that of the initial cabinet body structure. Through finite element strength simulation analysis, design variable combination, local optimization and/or overall optimization and cyclic optimization, the overall optimization process of the cabinet body structure design scheme of the converter is realized until the final optimization simulation analysis result of the optimized cabinet body structure design scheme meets the preset design requirement, and the weight of the final optimized cabinet body structure is smaller than that of the initial cabinet body structure, so that the light weight design of the converter is realized, and the light weight of the whole vehicle is promoted.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic flow chart of an embodiment of a method for reducing weight of a converter provided by the present invention;
fig. 2 is a schematic flow chart of another embodiment of a method for reducing weight of a converter provided by the present invention;
FIG. 3 is a bar graph of the sensitivity of the design variables of the present invention to weight;
FIG. 4 is a schematic view of embodiment 1 of the reinforcing bar of the present invention;
FIG. 5 is a schematic view of embodiment 2 of the reinforcing bar of the present invention;
fig. 6 is a schematic flow chart of a current transformer lightening method according to another embodiment of the present invention;
fig. 7 is a schematic flow chart of a method for lightening a converter according to still another embodiment of the present invention;
fig. 8 is a schematic structural diagram of an embodiment of a converter lightweight system according to the present invention.
Detailed Description
The application discloses a converter lightweight method, a converter lightweight system, a server and a computer readable storage medium, which are used for realizing lightweight design of a converter and promoting lightweight of a whole vehicle.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
Referring to fig. 1, an embodiment of the present invention provides a method for reducing weight of a converter, including:
101. obtaining an initial cabinet structure design scheme of the converter;
in this embodiment, in the field of rail transit, it is determined that the existing cabinet structure and the arrangement of electrical components of the converter cannot be substantially modified again to optimize the light weight, and the current initial cabinet structure design scheme can only be optimized, so that the initial cabinet structure design scheme for obtaining the converter is introduced by stored converter data or designers.
102. Carrying out finite element strength simulation analysis on the initial cabinet structure design scheme to obtain an initial simulation analysis result;
in this embodiment, the finite element strength simulation analysis mainly aims at each operating condition of the initial cabinet structure design scheme of the converter, and specifically includes:
carrying out finite element strength simulation analysis on the static strength working condition, the modal working condition, the random vibration working condition and the transient impact working condition to obtain a simulation analysis result, wherein the simulation analysis result comprises a static analysis result, a modal analysis result, a random vibration analysis result and a transient impact analysis result;
evaluating whether the static strength analysis result, the modal analysis result, the random vibration analysis result and the transient impact analysis result meet the preset design requirement;
if any one of the static strength analysis result, the modal analysis result, the random vibration analysis result and the transient impact analysis result does not meet the preset design requirement, determining that the initial cabinet structure design scheme does not meet the preset design requirement;
if the static strength analysis result, the modal analysis result, the random vibration analysis result and the transient impact analysis result all meet the preset design requirement, determining that the initial cabinet structure design scheme meets the preset design requirement;
the checking method for each working condition comprises the following steps:
the static strength working condition is a static strength simulation analysis working condition set according to standard EN 12663 structural requirements of railway application-rail car body;
the modal working condition is to analyze the real characteristic value by using a Lanczos method and extract the first 50-order modal frequency value;
the random vibration working condition is specified in standard IEC 61373 and 2010 railway application vehicle equipment impact and vibration test;
the transient impact working condition is specified according to the impact test condition in section 10 in standard IEC 61373 and 2010 railway application vehicle equipment impact and vibration test.
103. Determining a design variable combination based on a finite element model of an initial cabinet structure design scheme;
in this embodiment, when performing the finite element strength simulation analysis in step 102, a finite element model of the initial cabinet structure design scheme is pre-established, and a design variable combination is determined based on the finite element model, and design variables included in the design variable combination should be kept in one-to-one correspondence with design variables included in a preset standard (national standard or manufacturer standard), so as to ensure that the optimization result has strong engineering performance. The design variable combination comprises at least two design variables, and each design variable corresponds to a geometric parameter of the structural member to be optimized.
104. Performing local optimization and/or overall optimization on the initial cabinet structure design scheme according to the design variable combination to obtain an optimized cabinet structure design scheme;
in this embodiment, on the basis of the design variable combination, the geometric parameter optimization may be performed on the structure to be optimized corresponding to the design variable, and then the local optimization may be performed on the initial cabinet structure design scheme; or; integrally optimizing the structural design scheme of the initial cabinet body; or, the initial cabinet structure design scheme is optimized locally and then optimized integrally; in order to ensure the rigidity of partial components, local rigidity optimization is carried out, and finally an optimized cabinet structure design scheme is obtained.
105. Carrying out finite element strength simulation analysis on the structural design scheme of the optimized cabinet body to obtain an optimized simulation analysis result;
in this embodiment, after the design scheme of the optimized cabinet structure is obtained, verification is also required, that is, analysis of each working condition is performed through finite element strength simulation analysis in step 102, so as to obtain an optimized simulation result.
106. And when the optimized simulation analysis result does not meet the preset design requirement, continuously optimizing the design scheme of the optimized cabinet structure until the final optimized simulation analysis result meets the preset design requirement and the weight of the final optimized cabinet structure is less than that of the initial cabinet structure.
In the embodiment, if the optimized simulation analysis result meets the preset design requirement, the optimization is not needed; and when the optimized simulation analysis result does not meet the preset design requirement, the design scheme of the optimized cabinet structure needs to be repeatedly optimized until the final optimized simulation analysis result meets the preset design requirement, and the weight of the final optimized cabinet structure is smaller than that of the initial cabinet structure, so that the light weight target of the converter is completed.
In the embodiment of the invention, an initial cabinet structure design scheme of a converter is obtained, finite element strength simulation analysis is carried out on the initial cabinet structure design scheme to obtain an initial simulation analysis result, a design variable combination is determined based on a finite element model of the initial cabinet structure design scheme, local optimization and/or integral optimization are carried out on the initial cabinet structure design scheme according to the design variable combination to obtain an optimized cabinet structure design scheme, finite element strength simulation analysis is carried out on the optimized cabinet structure design scheme to obtain an optimized simulation analysis result, when the optimized simulation analysis result does not meet the preset design requirement, the optimized cabinet structure design scheme is continuously optimized until the final optimized simulation analysis result meets the preset design requirement, and the weight of the final optimized cabinet structure is less than that of the initial cabinet structure. Through finite element strength simulation analysis, design variable combination, local optimization and/or overall optimization and cyclic optimization, the overall optimization process of the cabinet body structure design scheme of the converter is realized until the final optimization simulation analysis result of the optimized cabinet body structure design scheme meets the preset design requirement, and the weight of the final optimized cabinet body structure is smaller than that of the initial cabinet body structure, so that the light weight design of the converter is realized, and the light weight of the whole vehicle is promoted.
In the embodiment shown in fig. 1, the optimization of the specific design scheme includes three cases, and the following description is made by using three embodiments.
Referring to fig. 2, an embodiment of the present invention provides a method for reducing weight of a converter, including:
201. obtaining an initial cabinet structure design scheme of the converter;
please refer to step 101 in the embodiment shown in fig. 1 for details.
202. Carrying out finite element strength simulation analysis on the initial cabinet structure design scheme to obtain an initial simulation analysis result;
please refer to step 102 in the embodiment shown in fig. 1 for details.
203. Determining a design variable combination based on a finite element model of an initial cabinet structure design scheme;
please refer to step 103 in the embodiment shown in fig. 1 for details.
204. Carrying out sensitivity analysis on the design variable combination to obtain a sensitivity value of each design variable, and selecting the optimal design parameter of each structural member to be optimized according to the sensitivity value to form an optimal design parameter subset;
in this embodiment, the specific steps are as follows:
(2041) determining each design variable in the design variable combination;
and a plurality of design variables are arranged in the design variable combination, and each design variable corresponds to a structural part to be optimized.
(2042) Generating geometric parameters of the structural part to be optimized corresponding to each design variable into design variables to be optimized, wherein the geometric parameters comprise at least two parameters;
and generating the geometric parameters of the structural part to be optimized corresponding to each design variable into the design variable to be optimized, wherein the geometric parameters can be parameters such as plate thickness and shape of the structural part to be optimized.
(2043) Performing sensitivity analysis by combining the random vibration result and the variables to be optimized to obtain the sensitivity value of each variable to be optimized to the fatigue working condition;
and loading a random vibration result obtained in the finite element strength simulation analysis, and performing sensitivity analysis on the variables to be optimized and designed by combining the random vibration result to obtain a sensitivity value of each variable to be optimized and designed to the fatigue working condition.
(2044) And selecting the optimal design parameters of each structural member to be optimized according to the sensitivity value of the fatigue working condition to form an optimal design parameter subset.
The sensitivity histogram of each design variable to be optimized for weight can be obtained by analysis, and the number of the first 40 bits of the sensitivity value and the sensitivity value are shown in a row in fig. 3. In fig. 3 it can be seen that the thickness change of number g11 is most sensitive to weight changes; by performing sensitivity analysis on the design variables, quantifying the importance degree of each design variable to each response, generating a high-quality sample space (for example, 40 bits before the sensitivity value in fig. 3), determining an optimal design parameter subset, wherein the optimal design parameter subset includes a plurality of optimal design parameters, improving the calculation efficiency and reducing the workload, and for optimizing weight reduction analysis, a part with high sensitivity should be selected as an optimized object.
205. Local arrangement optimization is carried out on the initial cabinet structure design scheme by adopting a topology optimization technology to obtain an optimal local arrangement optimization result;
in this embodiment, the specific process of local layout optimization is as follows:
(2051) obtaining the optimal material distribution or the optimal force transmission path of a local structure by adopting a topology optimization technology;
the topology optimization technology is a promising and innovative technology in the structural optimization technology, and means that the optimal material distribution or force transmission path is found in a given local structure, so that the design with the lightest weight is obtained under the condition of meeting various performances;
(2052) carrying out local arrangement optimization on the local structure according to the optimal material distribution or the optimal force transmission path to obtain at least two local arrangement optimization results;
taking the part number TE9974112505 dc-side connector mount plate as an example, the reinforcement bar position 401 in reinforcement bar solution 1 of fig. 4, and the reinforcement bar position 501 in reinforcement bar solution 2 of fig. 5;
(2053) and carrying out local model simulation analysis comparison on the at least two local arrangement optimization results to obtain an optimal local arrangement optimization result.
Comparing the partial model simulation analysis of the scheme 1 in the figure 4 with the scheme 2 in the figure 5, the reinforcing rib distribution form in the scheme 1 has better structural performance, and the thickness of the scheme 1 is 2.9mm, the weight of the scheme 1 is 0.312kg and the initial weight reduction proportion of the scheme 1 is 22% when the performance is close to that of the original scheme through linear conversion.
206. When the target component with insufficient rigidity exists in the optimal local arrangement optimization result, local rigidity optimization is carried out on the target component to obtain an optimized cabinet structure design scheme;
in this embodiment, when there is a target component with insufficient rigidity in the optimal local arrangement optimization result, local rigidity optimization is performed on the target component by using a morphology optimization technique and a profile section optimization technique, so as to obtain an optimized cabinet structure design scheme. The topography optimization technology is widely applied to improving the performance of various stamping plates, such as reducing deformation, improving modal frequency, reducing vibration and the like. The section optimization of the section is realized by using a shape optimization technology, and the technology is equivalent to changing the CAD design of part parts by moving or deforming grid nodes to a certain new position, so that the performance of the part parts is improved, such as the improvement of rigidity and mode, the reduction of stress concentration and the like;
the main U-shaped beam of bearing in the cabinet body is selected as a target component in the structural optimization based on the existing cabinet body, the technical key points of shape optimization and combined size optimization are studied, the applicability of the result is not considered at all, the optimization and the size optimization are carried out synchronously, and the change of the section is ensured on the premise of unchanged quality.
And (2) establishing a U-shaped beam local sub-model by adopting a Direct Matrix Input Grid (DMIG) method, wherein the DMIG inputs model information of structures except the part into a calculation file of the part in an equivalent Matrix form, so that the part obtains the same accurate boundary support in the overall finite element model.
207. Carrying out finite element strength simulation analysis on the structural design scheme of the optimized cabinet body to obtain an optimized simulation analysis result;
in this embodiment, after obtaining the optimized cabinet structure design scheme, verification is required, that is, analysis of each working condition is performed through finite element strength simulation analysis, so as to obtain an optimized simulation result.
208. And when the optimized simulation analysis result does not meet the preset design requirement, continuously optimizing the design scheme of the optimized cabinet structure until the final optimized simulation analysis result meets the preset design requirement and the weight of the final optimized cabinet structure is less than that of the initial cabinet structure.
In the embodiment of the invention, the optimization method is specifically explained to be that sensitivity analysis is firstly carried out, then local arrangement optimization is carried out, and when parts with insufficient rigidity exist, local rigidity optimization is carried out, so that the whole size optimization is not needed, and the complexity of optimization is reduced.
Referring to fig. 6, an embodiment of the present invention provides a method for reducing weight of a converter, including:
601. obtaining an initial cabinet structure design scheme of the converter;
please refer to step 101 in the embodiment shown in fig. 1 for details.
602. Carrying out finite element strength simulation analysis on the initial cabinet structure design scheme to obtain an initial simulation analysis result;
please refer to step 102 in the embodiment shown in fig. 1 for details.
603. Determining a design variable combination based on a finite element model of an initial cabinet structure design scheme;
please refer to step 103 in the embodiment shown in fig. 1 for details.
604. Carrying out sensitivity analysis on the design variable combination to obtain a sensitivity value of each design variable, and selecting the optimal design parameter of each structural member to be optimized according to the sensitivity value to form an optimal design parameter subset;
refer to step 204 in the embodiment shown in FIG. 2 for details.
605. Carrying out overall size optimization on the initial cabinet structure design scheme according to a size optimization principle to obtain an overall size optimization result;
in this embodiment, the overall size optimization process specifically includes:
(6051) selecting a part to be subjected to size optimization from an initial cabinet structure design scheme according to a size optimization principle;
in the design scheme of the initial cabinet body structure of the converter, certain devices and parts are fixed and cannot be optimized, so that electric devices and related installation components thereof need to be eliminated, binding rods existing in a cabinet body model are eliminated, components with unit types of solid units are eliminated, parts which are connected with suspension arms in the cabinet body and do not have direct load action are eliminated, and the rest parts are used as parts to be optimized in size; in addition, in order to improve optimization efficiency, the attributes of parts with the same material, the same thickness and similar cross sections need to be normalized, the attribute of the parts with the consistent thickness needs to be normalized by considering the reasons of symmetry, flatness and the like, so that design variables are reduced, a material SET SET is created according to the material type, and an exclusion unit SET SET is created according to the material type.
(6052) And optimizing the size of the part to be optimized according to the three size optimization factors to obtain an overall size optimization result, wherein the three size optimization factors comprise an optimization variable, an optimization constraint and an optimization target, the optimization variable is used for defining the thickness data of the part to be optimized corresponding to the size, the optimization constraint represents the establishment of an optimization stress constraint according to the type of the material, and the optimization target is the minimum weight of the cabinet body structure.
The size optimization has three elements: optimizing variables, optimizing constraints and optimizing targets; the optimization variables are thickness data for defining a part to be optimized corresponding to the size, and the thickness data specifically comprise an initial thickness, an optimized thickness lower limit and an optimized thickness upper limit; creating optimized stress constraint according to the material type; according to the yield strength of each material, taking the safety coefficient of 1.15 into consideration, rounding the value, associating the working conditions, and finally taking the minimum weight of the cabinet body structure as an optimization target;
and after multiple times of iteration optimization of the overall dimension of the static working condition, the dimension and the structure of each part of the optimized model are preliminarily determined, the performance of the model basically meets the mechanical requirements, and the conditions that the impact stress and the random stress exceed exist in a local detail place are followed by local rigidity check and local configuration adjustment.
606. When the target component with insufficient rigidity exists in the overall size optimization result, local rigidity optimization is carried out on the target component to obtain an optimized cabinet structure design scheme;
in this embodiment, when there is a target component with insufficient rigidity in the overall size optimization result, local rigidity optimization is performed on the target component by using a morphology optimization technique and a profile section optimization technique to obtain an optimized cabinet structure design scheme, please refer to step 206 in the embodiment shown in fig. 2 in detail.
607. Carrying out finite element strength simulation analysis on the structural design scheme of the optimized cabinet body to obtain an optimized simulation analysis result;
608. and when the optimized simulation analysis result does not meet the preset design requirement, continuously optimizing the design scheme of the optimized cabinet structure until the final optimized simulation analysis result meets the preset design requirement and the weight of the final optimized cabinet structure is less than that of the initial cabinet structure.
In the embodiment of the invention, the optimization method is specifically explained to be that sensitivity analysis is firstly carried out, then overall size optimization is carried out, and when parts with insufficient rigidity exist, local rigidity optimization is carried out, local arrangement optimization is not needed, and the complexity of optimization is reduced.
Referring to fig. 7, an embodiment of the present invention provides a method for reducing weight of a converter, including:
701. obtaining an initial cabinet structure design scheme of the converter;
please refer to step 101 in the embodiment shown in fig. 1 for details.
702. Carrying out finite element strength simulation analysis on the initial cabinet structure design scheme to obtain an initial simulation analysis result;
please refer to step 102 in the embodiment shown in fig. 1 for details.
703. Determining a design variable combination based on a finite element model of an initial cabinet structure design scheme;
please refer to step 103 in the embodiment shown in fig. 1 for details.
704. Carrying out sensitivity analysis on the design variable combination to obtain a sensitivity value of each design variable, and selecting the optimal design parameter of each structural member to be optimized according to the sensitivity value to form an optimal design parameter subset;
refer to step 204 in the embodiment shown in FIG. 2 for details.
705. Local arrangement optimization is carried out on the initial cabinet structure design scheme by adopting a topology optimization technology to obtain an optimal local arrangement optimization result, and overall size optimization is carried out according to the optimal local arrangement optimization result to obtain an overall size optimization result;
in this embodiment, the local placement optimization and the overall size optimization are optimized in combination according to (2051) to (2053) in step 205 in the embodiment shown in fig. 2 and (6051) and (6052) in step 605 in the embodiment shown in fig. 6.
706. When the target component with insufficient rigidity exists in the overall size optimization result, local rigidity optimization is carried out on the target component to obtain an optimized cabinet structure design scheme;
in this embodiment, when there is a target component with insufficient rigidity in the overall size optimization result, local rigidity optimization is performed on the target component by using a morphology optimization technique and a profile section optimization technique to obtain an optimized cabinet structure design scheme, please refer to step 206 in the embodiment shown in fig. 2 in detail.
707. Carrying out finite element strength simulation analysis on the structural design scheme of the optimized cabinet body to obtain an optimized simulation analysis result;
708. and when the optimized simulation analysis result does not meet the preset design requirement, continuously optimizing the design scheme of the optimized cabinet structure until the final optimized simulation analysis result meets the preset design requirement and the weight of the final optimized cabinet structure is less than that of the initial cabinet structure.
In the embodiment of the invention, the optimization method is specifically explained as that the sensitivity analysis is firstly carried out, then the local arrangement optimization is carried out, finally the overall size optimization is carried out, and when the part with insufficient rigidity exists, the local rigidity optimization is carried out, so that the optimization of the cabinet body structure design scheme of the converter is more perfect.
In the embodiments shown in fig. 1, 2, 6 and 7, the method for reducing the weight of the converter is described, and a system for reducing the weight of the converter using the method is described below.
Referring to fig. 8, an embodiment of the present invention provides a light-weight converter system, including:
the acquisition module 801 is used for acquiring an initial cabinet structure design scheme of the converter;
the finite element strength simulation analysis module 802 is used for performing finite element strength simulation analysis on the initial cabinet structure design scheme to obtain an initial simulation analysis result;
a design variable module 803, configured to determine a design variable combination based on a finite element model of an initial cabinet structure design scheme;
the optimization module 804 is used for carrying out local optimization and/or overall optimization on the initial cabinet structure design scheme according to the design variable combination to obtain an optimized cabinet structure design scheme;
the finite element strength simulation analysis module 802 is further configured to perform finite element strength simulation analysis on the structural design scheme of the optimized cabinet body to obtain an optimized simulation analysis result;
the optimizing module 804 is further configured to, when the optimized simulation analysis result does not meet the preset design requirement, continue optimizing the design scheme of the optimized cabinet structure until the final optimized simulation analysis result meets the preset design requirement, and the weight of the final optimized cabinet structure is smaller than the weight of the initial cabinet structure.
In the embodiment of the invention, an obtaining module 801 obtains an initial cabinet structure design scheme of a converter, a finite element strength simulation analysis module 802 performs finite element strength simulation analysis on the initial cabinet structure design scheme to obtain an initial simulation analysis result, a design variable module 803 determines a design variable combination based on a finite element model of the initial cabinet structure design scheme, an optimization module 804 performs local optimization and/or overall optimization on the initial cabinet structure design scheme according to the design variable combination to obtain an optimized cabinet structure design scheme, the finite element strength simulation analysis module 802 performs finite element strength simulation analysis on the optimized cabinet structure design scheme to obtain an optimized simulation analysis result, when the optimized simulation analysis result does not meet a preset design requirement, the optimization module 804 continuously optimizes the optimized cabinet structure design scheme until the final optimized simulation analysis result meets the preset design requirement, and the weight of the final optimized cabinet structure is less than the weight of the initial cabinet structure. Through finite element strength simulation analysis, design variable combination, local optimization and/or overall optimization and cyclic optimization, the overall optimization process of the cabinet body structure design scheme of the converter is realized until the final optimization simulation analysis result of the optimized cabinet body structure design scheme meets the preset design requirement, and the weight of the final optimized cabinet body structure is smaller than that of the initial cabinet body structure, so that the light weight design of the converter is realized, and the light weight of the whole vehicle is promoted.
In addition to the embodiment shown in fig. 8, the converter weight reduction system may also perform the steps and functions of the converter weight reduction method in the embodiments shown in fig. 1, fig. 2, fig. 6, and fig. 7.
It should be noted that the converter lightweight method and system provided by the invention are not only suitable for the lightweight of the high-power converter in the field of rail transit, but also can be applied to lightweight design work of electrical cubicles in other industries.
An embodiment of the present invention further provides a server, including:
a memory, a processor, and a computer program stored in the memory and executable on the processor;
and when the processor executes the computer program, the method for lightening the converter in any one of the above embodiments is realized.
An embodiment of the present invention further provides a computer-readable storage medium, including:
a computer program is stored which can be loaded by a processor and which performs the method of current transformer lightening in any of the above embodiments.
The computer-readable storage medium includes, for example: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (12)
1. A method for reducing the weight of a converter is characterized by comprising the following steps:
obtaining an initial cabinet structure design scheme of the converter;
carrying out finite element strength simulation analysis on the initial cabinet body structure design scheme to obtain an initial simulation analysis result;
determining a design variable combination based on a finite element model of the initial cabinet structure design scheme;
performing local optimization and/or overall optimization on the initial cabinet structure design scheme according to the design variable combination to obtain an optimized cabinet structure design scheme;
carrying out finite element strength simulation analysis on the optimized cabinet structure design scheme to obtain an optimized simulation analysis result;
and when the optimized simulation analysis result does not meet the preset design requirement, continuously optimizing the design scheme of the optimized cabinet structure until the final optimized simulation analysis result meets the preset design requirement and the weight of the final optimized cabinet structure is less than that of the initial cabinet structure.
2. The converter lightweight method according to claim 1, wherein the performing finite element strength simulation analysis on the initial cabinet structure design scheme to obtain an initial simulation analysis result comprises:
carrying out finite element strength simulation analysis on the static strength working condition, the modal working condition, the random vibration working condition and the transient impact working condition of the initial cabinet body structure design scheme to obtain a simulation analysis result, wherein the simulation analysis result comprises a static analysis result, a modal analysis result, a random vibration analysis result and a transient impact analysis result;
the method further comprises the following steps:
evaluating whether the static strength analysis result, the modal analysis result, the random vibration analysis result and the transient impact analysis result meet preset design requirements;
if any one of the static strength analysis result, the modal analysis result, the random vibration analysis result and the transient impact analysis result does not meet the preset design requirement, determining that the initial cabinet structure design scheme does not meet the preset design requirement;
and if the static strength analysis result, the modal analysis result, the random vibration analysis result and the transient impact analysis result all meet the preset design requirement, determining that the initial cabinet structure design scheme meets the preset design requirement.
3. The converter lightening method of claim 2, wherein the determining a design variable combination based on the finite element model of the initial cabinet structure design solution comprises:
determining a finite element model of the initial cabinet structure established in the finite element strength simulation analysis process;
and determining a design variable combination based on the finite element model, wherein the design variables in the design variable combination correspond to the design variables in the preset standard one by one, the design variable combination comprises at least two design variables, and each design variable corresponds to the geometric parameter of a structural member to be optimized.
4. The converter lightweight method according to claim 3, wherein the step of performing local optimization and/or global optimization on the initial cabinet structure design scheme according to the design variable combination to obtain an optimized cabinet structure design scheme comprises:
carrying out sensitivity analysis on the design variable combination to obtain a sensitivity value of each design variable, and selecting the optimal design parameter of each structural member to be optimized according to the sensitivity value to form an optimal design parameter subset;
local arrangement optimization is carried out on the initial cabinet body structure design scheme by adopting a topology optimization technology to obtain an optimal local arrangement optimization result;
or the like, or, alternatively,
carrying out overall size optimization on the initial cabinet structure design scheme according to a size optimization principle to obtain an overall size optimization result;
or the like, or, alternatively,
local arrangement optimization is carried out on the initial cabinet structure design scheme by adopting a topology optimization technology to obtain an optimal local arrangement optimization result, and overall size optimization is carried out according to the optimal local arrangement optimization result to obtain an overall size optimization result;
and when the target component with insufficient rigidity exists in the optimal local arrangement optimization result or the overall size optimization result, performing local rigidity optimization on the target component to obtain an optimized cabinet structure design scheme.
5. The converter lightweight method according to claim 4, wherein the sensitivity analysis is performed on the design variable combination to obtain a sensitivity value of each design variable, and the optimal design parameter of each structural member to be optimized is selected according to the sensitivity value to form an optimal design parameter subset, and the method comprises the following steps:
determining each of the design variables in the combination of design variables;
generating geometric parameters of the structural part to be optimized corresponding to each design variable into design variables to be optimized, wherein the geometric parameters comprise at least two parameters;
performing sensitivity analysis by combining the random vibration result and the design variables to be optimized to obtain a sensitivity value of each design variable to be optimized to the fatigue working condition;
and selecting the optimal design parameters of each structural member to be optimized according to the sensitivity value of the fatigue working condition to form an optimal design parameter subset.
6. The converter lightweight method according to claim 4, wherein the local arrangement optimization is performed on the initial cabinet structure design scheme by using a topology optimization technology to obtain an optimal local arrangement optimization result, and the method comprises the following steps:
obtaining the optimal material distribution or the optimal force transmission path of a local structure by adopting a topology optimization technology;
performing local arrangement optimization on the local structure according to the optimal material distribution or the optimal force transmission path to obtain at least two local arrangement optimization results;
and carrying out local model simulation analysis comparison on the at least two local arrangement optimization results to obtain an optimal local arrangement optimization result.
7. The method for reducing the weight of the converter according to claim 4, wherein the overall dimension optimization of the initial cabinet structure design scheme according to a dimension optimization principle is performed to obtain an overall dimension optimization result, and the method comprises the following steps:
selecting a part to be subjected to size optimization from the initial cabinet structure design scheme according to a size optimization principle;
and carrying out size optimization on the part to be subjected to size optimization according to three size optimization factors to obtain an overall size optimization result, wherein the three size optimization factors comprise optimization variables, optimization constraints and optimization targets, the optimization variables are used for defining thickness data of the part to be subjected to size optimization, the optimization constraints represent that optimization stress constraints are created according to material types, and the optimization targets are the minimum weight of the cabinet body structure.
8. The converter lightweight method according to claim 4, wherein the performing local layout optimization on the initial cabinet structure design scheme by using a topology optimization technology to obtain an optimal local layout optimization result, and performing overall size optimization according to the optimal local layout optimization result to obtain an overall size optimization result comprises:
obtaining the optimal material distribution or the optimal force transmission path of a local structure by adopting a topology optimization technology;
performing local arrangement optimization on the local structure according to the optimal material distribution or the optimal force transmission path to obtain at least two local arrangement optimization results;
carrying out local model simulation analysis comparison on the at least two local layout optimization results to obtain an optimal local layout optimization result;
modifying and arranging the local model according to the optimal local arrangement optimization result to obtain a locally optimized cabinet structure design scheme;
selecting a part to be subjected to size optimization from the cabinet body structure design scheme subjected to local optimization according to a size optimization principle;
and carrying out size optimization on the part to be subjected to size optimization according to three size optimization factors to obtain an overall size optimization result, wherein the three size optimization factors comprise optimization variables, optimization constraints and optimization targets, the optimization variables are used for defining thickness data of the part to be subjected to size optimization, the optimization constraints represent that optimization stress constraints are created according to material types, and the optimization targets are the minimum weight of the cabinet body structure.
9. The method for reducing the weight of the current transformer according to any one of claims 4 to 8, wherein the local rigidity optimization of the target component is performed to obtain an optimized cabinet structure design scheme, and the method comprises the following steps:
and when the target part with insufficient rigidity exists in the optimal local arrangement optimization result and/or the overall size optimization result, performing local rigidity optimization on the target part by adopting a morphology optimization technology and a section optimization technology to obtain an optimized cabinet structure design scheme.
10. A converter lightweight system, comprising:
the acquisition module is used for acquiring an initial cabinet structure design scheme of the converter;
the finite element strength simulation analysis module is used for carrying out finite element strength simulation analysis on the initial cabinet body structure design scheme to obtain an initial simulation analysis result;
the design variable module is used for determining a design variable combination based on a finite element model of the initial cabinet structure design scheme;
the optimization module is used for carrying out local optimization and/or overall optimization on the initial cabinet body structure design scheme according to the design variable combination to obtain an optimized cabinet body structure design scheme;
the finite element strength simulation analysis module is also used for carrying out finite element strength simulation analysis on the structural design scheme of the optimized cabinet body to obtain an optimized simulation analysis result;
the optimization module is further configured to, when the optimization simulation analysis result does not meet the preset design requirement, continue to optimize the design scheme of the optimized cabinet structure until the final optimization simulation analysis result meets the preset design requirement, and the weight of the final optimized cabinet structure is smaller than that of the initial cabinet structure.
11. A server, comprising:
a memory, a processor, and a computer program stored in the memory and executable on the processor;
the processor, when executing the computer program, implements the current transformer lightening method of any one of claims 1 to 9.
12. A computer-readable storage medium, comprising:
a computer program that can be loaded by a processor and that executes the current transformer lightening method according to any one of claims 1 to 9 is stored.
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