CN112287453A - Body-in-white lightweight optimal design method - Google Patents
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- CN112287453A CN112287453A CN202011112071.2A CN202011112071A CN112287453A CN 112287453 A CN112287453 A CN 112287453A CN 202011112071 A CN202011112071 A CN 202011112071A CN 112287453 A CN112287453 A CN 112287453A
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- 238000000034 method Methods 0.000 title claims abstract description 58
- 239000000463 material Substances 0.000 claims abstract description 43
- 238000006073 displacement reaction Methods 0.000 claims abstract description 31
- 238000005452 bending Methods 0.000 claims abstract description 17
- 238000004364 calculation method Methods 0.000 claims abstract description 13
- 238000010276 construction Methods 0.000 claims abstract description 7
- 238000005457 optimization Methods 0.000 claims abstract description 7
- 238000003466 welding Methods 0.000 claims description 24
- 238000013016 damping Methods 0.000 claims description 18
- 102100040287 GTP cyclohydrolase 1 feedback regulatory protein Human genes 0.000 claims description 12
- 101710185324 GTP cyclohydrolase 1 feedback regulatory protein Proteins 0.000 claims description 12
- 239000004918 carbon fiber reinforced polymer Substances 0.000 claims description 11
- 229910000838 Al alloy Inorganic materials 0.000 claims description 6
- 238000004458 analytical method Methods 0.000 claims description 6
- 150000001875 compounds Chemical class 0.000 claims description 6
- 239000004033 plastic Substances 0.000 claims description 6
- 239000011347 resin Substances 0.000 claims description 6
- 229920005989 resin Polymers 0.000 claims description 6
- 238000001721 transfer moulding Methods 0.000 claims description 6
- 239000003365 glass fiber Substances 0.000 claims description 5
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- 239000003677 Sheet moulding compound Substances 0.000 description 13
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- G—PHYSICS
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
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Abstract
The invention discloses a white vehicle body lightweight optimization design method, and particularly relates to the field of white vehicle body lightweight, wherein the optimization design method comprises the following steps: s1: determining a single-degree-of-freedom system model, determining displacement curves of the system and the structure during vibration based on a structure dynamics generalized coordinate method, S2: establishing a system motion equation, firstly establishing a calculation model by adopting a rigidity method of a direct balance method, and S3: equation data versus body-in-white construction, inertial force FIRepresenting braking performance data of a body-in-white structure, elastic force FSRepresentative of bending, cornering and torsion performance data for a body-in-white structure. The invention can reduce the number of parts of the car body by about 20-30 percent by changing materials, optimizing the design method and improving the manufacturing processThe weight is reduced by 15-25%, the torsional rigidity is improved by 60-70%, the vibration characteristic is improved by 30-40%, the bending rigidity and the impact load are enhanced, the method has the advantages of direct process, more visual design data and better light weight effect.
Description
Technical Field
The invention relates to the field of body-in-white light weight, in particular to a body-in-white light weight optimization design method.
Background
With the increasing of the automobile keeping quantity and the production and sale quantity year by year, the oil dependence degree of China is forced to increase year by year, the energy saving and consumption reduction are not moderate, the traditional design method is difficult to improve the fuel economy of the automobile, and the light weight of the automobile body is an effective method at present.
The existing white vehicle body lightweight optimization design method has the defects that the number of vehicle body parts is reduced, the vehicle body mass is reduced, the torsional rigidity is improved, the bending rigidity and the impact load are enhanced by changing materials, optimizing the design method and improving the manufacturing process, the method process is not direct enough, and the design data is not visual enough.
The above information disclosed in this background section is only for enhancement of understanding of the background of the disclosure and therefore it may contain information that does not constitute prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
In order to overcome the above defects in the prior art, an embodiment of the present invention provides a body-in-white light weight optimization design method, and the technical problems to be solved by the present invention are: how to change materials, optimize a design method and improve a manufacturing process enables the optimization process to be direct, design data to be more visual, and the light-weight effect to be better.
In order to achieve the purpose, the invention provides the following technical scheme: a body-in-white lightweight optimal design method comprises the following steps:
s1: determining a single-degree-of-freedom system model, determining a displacement curve of the system and the structure during vibration based on a structure dynamics generalized coordinate method, wherein the displacement curve is y (x, t), and determining the displacement curve according to a displacement function phik(x) Is expressed as:
coefficient of combination Ak(t) is the generalized coordinates of the system;
s2: establishing a system motion equation, firstly establishing a calculation model by adopting a rigidity method of a direct balance method, and then establishing a balance equation F (t) ═ FI+FD+FSIn which the inertia force
Spring force FSKy, damping force
m is a white body structure model, the horizontal displacement y (t), k is the rigidity of an external weightless spring, c is the damping coefficient of a weightless damper, F (t) is a load which changes along with time, and the motion equation of the system is obtained thereby
S3: equation data versus body-in-white construction, inertial force FIRepresenting braking performance data of a body-in-white structure, elastic force FSRepresenting bending, cornering and torsion performance data of a body-in-white structure, damping force FDRepresenting impact load performance data for a body-in-white structure.
The implementation mode is that a single-degree-of-freedom system model is established, a displacement curve of the system and the structure during vibration is determined based on a structure dynamics generalized coordinate method, the displacement curve is y (x, t), and the displacement curve is determined according to a displacement function phik(x) Is expressed as:
coefficient of combination Ak(t) is the generalized coordinate of the system, the system motion equation is established, firstly, the stiffness method of the direct balance method is adopted to establish a calculation model, and then the balance equation F (t) ═ F is establishedI+FD+FSIn which the inertia force
Spring force FSKy, damping force
m is a white body structure model, the horizontal displacement y (t), k is the rigidity of an external weightless spring, c is the damping coefficient of a weightless damper, F (t) is a load which changes along with time, and the motion equation of the system is obtained thereby
Equation data versus body-in-white construction, inertial force FIRepresenting braking performance data of a body-in-white structure, elastic force FSRepresenting bending, cornering and torsion performance data of a body-in-white structure, damping force FDRepresenting the impact load performance data of a body-in-white structure, the GFRP mixed material mainly comprises sheet molding compound plastic (SMC), glass fiber mat reinforced thermoplastic material (GMT) and resin transfer molding compound material (RTM), and the material proportion SMC is as follows: GMT: RTM ranges from 0.2 to 0.35:0.3 to 0.4:0.2 to 0.5, the state of the GFRP mixed material is adjusted under the proportion, a white body bracket structure adopts CFRP materials, the proportion ranges from 0.8 to 0.95, the state of the CFRP materials is adjusted under the proportion, the forming process adopts hydraulic forming, internal high pressure forming, thermal forming and aluminum alloy semisolid forming, the welding mode adopts medium frequency welding, laser welding and special welding, the material proportion is adjusted according to the calculation result of a system motion equation, the body quality begins to be reduced on the premise that various performance indexes are qualified, finite element analysis is carried out on the white body structure by adopting finite element software, and the stress of the white body structure under the working conditions of braking, bending, turning, torsion and impact load is calculated.
In a preferred embodiment, the body-in-white structure includes a carrier structure and a component structure, and the body-in-white component structure is a GFRP hybrid material.
In a preferred embodiment, the GFRP mixture consists essentially of sheet molded composite plastic (SMC), glass mat reinforced thermoplastic (GMT), and resin transfer molding compound material (RTM) in the proportions SMC: GMT: RTM ranges from 0.2-0.35:0.3-0.4: 0.2-0.5.
In a preferred embodiment, the body-in-white bracket structure is made of CFRP material in a ratio in the range of 0.8-0.95.
In a preferred embodiment, the body-in-white structure is formed by hydroforming, internal high pressure forming, thermoforming, and semi-solid aluminum alloy forming.
In a preferred embodiment, the welding mode of the body-in-white structure adopts medium frequency welding, laser welding and special welding.
In a preferred embodiment, the material ratio is adjusted according to the calculation result of the system motion equation, and the vehicle body mass starts to be reduced on the premise that various performance indexes are qualified.
In a preferred embodiment, the body-in-white structure is subjected to finite element analysis using finite element software to calculate the stresses of the body-in-white structure under braking, bending, cornering, torsion and impact loading conditions.
The invention has the technical effects and advantages that:
by changing materials, optimizing a design method and improving a manufacturing process, the number of parts of the vehicle body can be reduced by about 20-30%, the mass of the vehicle body is reduced by 15-25%, the torsional rigidity is improved by 60-70%, the vibration characteristic is improved by 30-40%, and the bending rigidity and the impact load are enhanced at the same time.
Detailed Description
Example embodiments will now be described more fully hereinafter with reference to examples of the invention. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more example embodiments. In the following description, numerous specific details are provided to give a thorough understanding of example embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the subject matter of the present disclosure can be practiced without one or more of the specific details, or with other methods, components, steps, and so forth. In other instances, well-known structures, methods, implementations, or operations are not shown or described in detail to avoid obscuring aspects of the disclosure.
The invention provides a body-in-white lightweight optimal design method, which comprises the following steps:
s1: determining a single-degree-of-freedom system model, determining a displacement curve of the system and the structure during vibration based on a structure dynamics generalized coordinate method, wherein the displacement curve is y (x, t), and determining the displacement curve according to a displacement function phik(x) Is expressed as:
coefficient of combination Ak(t) is the generalized coordinates of the system;
s2: establishing a system motion equation, firstly establishing a calculation model by adopting a rigidity method of a direct balance method, and then establishing a balance equation F (t) ═ FI+FD+FSIn which the inertia force
Spring force FSKy, damping force
m is a white body structure model, the horizontal displacement y (t), k is the rigidity of an external weightless spring, c is the damping coefficient of a weightless damper, F (t) is a load which changes along with time, and the motion equation of the system is obtained thereby
S3: equation data versus body-in-white construction, inertial force FIRepresenting braking performance data of a body-in-white structure, elastic force FSRepresenting bending, cornering and torsion performance data of a body-in-white structure, damping force FDRepresenting impact load performance data for a body-in-white structure.
The body-in-white structure includes a bracket structure and a component structure, and the body-in-white component structure adopts GFRP mixed material.
The GFRP mixed material mainly comprises sheet mould pressing composite plastic (SMC), glass fiber felt reinforced thermoplastic material (GMT) and resin transfer molding compound material (RTM), wherein the material proportion SMC is as follows: GMT: RTM ranges from 0.2-0.35:0.3-0.4: 0.2-0.5.
The body-in-white bracket structure is made of CFRP materials, and the proportion range of the CFRP materials is 0.8-0.95.
The body-in-white structure is formed by hydraulic forming, internal high pressure forming, thermal forming and aluminum alloy semi-solid forming.
The welding mode of the body-in-white structure adopts medium frequency welding, laser welding and special welding.
And adjusting the material ratio according to the calculation result of the system motion equation, and starting to reduce the vehicle body quality on the premise of various qualified performance indexes.
Finite element analysis is carried out on the body-in-white structure by adopting finite element software, and the stress of the body-in-white structure under the working conditions of braking, bending, turning, twisting and impact load is calculated.
The implementation mode is specifically as follows: determining a single-degree-of-freedom system model, determining a displacement curve of the system and the structure during vibration based on a structure dynamics generalized coordinate method, wherein the displacement curve is y (x, t), and determining the displacement curve according to a displacement function phik(x) Is expressed as:
coefficient of combination Ak(t) is the generalized coordinate of the system, the system motion equation is established, firstly, the stiffness method of the direct balance method is adopted to establish a calculation model, and then the balance equation F (t) ═ F is establishedI+FD+FSIn which the inertia force
Spring force FSKy, damping force
m is a white body structure model, the horizontal displacement y (t), k is the rigidity of an external weightless spring, c is the damping coefficient of a weightless damper, F (t) is a load which changes along with time, and the motion equation of the system is obtained thereby
Equation data versus body-in-white construction, inertial force FIRepresentative white vehicleBraking performance data of body structure, elastic force FSRepresenting bending, cornering and torsion performance data of a body-in-white structure, damping force FDRepresenting the impact load performance data of a body-in-white structure, the GFRP mixed material mainly comprises sheet molding compound plastic (SMC), glass fiber mat reinforced thermoplastic material (GMT) and resin transfer molding compound material (RTM), and the material proportion SMC is as follows: GMT: RTM range is 0.2-0.35:0.3-0.4:0.2-0.5, the state of GFRP mixed material is adjusted under the proportion, CFRP material is adopted for a white body bracket structure, the proportion range is 0.8-0.95, the state of the CFRP material is adjusted under the proportion, the forming process adopts hydraulic forming, internal high pressure forming, thermal forming and aluminum alloy semisolid forming, the welding mode adopts medium frequency welding, laser welding and special welding, the material proportion is adjusted according to the calculation result of a system motion equation, the body mass is reduced under the premise that various performance indexes are qualified, finite element analysis is carried out on the white body structure by adopting finite element software, the stress of the white body structure under the working conditions of braking, bending, turning, torsion and impact load is calculated, the body part number is reduced by about 20-30%, the body mass is reduced by 15-25%, the torsional rigidity is improved by 60-70%, the vibration characteristic is improved by 30-40%, and the bending rigidity and the impact load are enhanced at the same time, the method has the advantages of direct process, more visual design data and better lightweight effect.
The working principle of the invention is as follows:
determining a single-degree-of-freedom system model, determining a displacement curve of the system and the structure during vibration based on a structure dynamics generalized coordinate method, wherein the displacement curve is y (x, t), and determining the displacement curve according to a displacement function phik(x) Is expressed as:
coefficient of combination Ak(t) is the generalized coordinate of the system, the system motion equation is established, firstly, the stiffness method of the direct balance method is adopted to establish a calculation model, and then the balance equation F (t) ═ F is establishedI+FD+FSIn which the inertia force
Spring force FSKy, damping force
m is a white body structure model, the horizontal displacement y (t), k is the rigidity of an external weightless spring, c is the damping coefficient of a weightless damper, F (t) is a load which changes along with time, and the motion equation of the system is obtained thereby
Equation data versus body-in-white construction, inertial force FIRepresenting braking performance data of a body-in-white structure, elastic force FSRepresenting bending, cornering and torsion performance data of a body-in-white structure, damping force FDRepresenting the impact load performance data of a body-in-white structure, the GFRP mixed material mainly comprises sheet molding compound plastic (SMC), glass fiber mat reinforced thermoplastic material (GMT) and resin transfer molding compound material (RTM), and the material proportion SMC is as follows: GMT: RTM ranges from 0.2 to 0.35:0.3 to 0.4:0.2 to 0.5, the state of the GFRP mixed material is adjusted under the proportion, a white body bracket structure adopts CFRP materials, the proportion ranges from 0.8 to 0.95, the state of the CFRP materials is adjusted under the proportion, the forming process adopts hydraulic forming, internal high pressure forming, thermal forming and aluminum alloy semisolid forming, the welding mode adopts medium frequency welding, laser welding and special welding, the material proportion is adjusted according to the calculation result of a system motion equation, the body quality begins to be reduced on the premise that various performance indexes are qualified, finite element analysis is carried out on the white body structure by adopting finite element software, and the stress of the white body structure under the working conditions of braking, bending, turning, torsion and impact load is calculated.
Finally, it should be noted that: first, the present invention has been described in detail by the general description and the specific embodiments, but on the basis of the present invention, the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention;
secondly, the method comprises the following steps: 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 are within the spirit and principle of the present invention are intended to be included in the scope of the present invention.
Claims (8)
1. A body-in-white lightweight optimal design method is characterized by comprising the following steps: the optimization design method comprises the following steps:
s1: determining a single-degree-of-freedom system model, determining a displacement curve of the system and the structure during vibration based on a structure dynamics generalized coordinate method, wherein the displacement curve is y (x, t), and determining the displacement curve according to a displacement function phik(x) Is expressed as:
coefficient of combination Ak(t) is the generalized coordinates of the system;
s2: establishing a system motion equation, firstly establishing a calculation model by adopting a rigidity method of a direct balance method, and then establishing a balance equation F (t) ═ FI+FD+FSIn which the inertia force
Spring force FSKy, damping force
m is a white body structure model, the horizontal displacement y (t), k is the rigidity of an external weightless spring, c is the damping coefficient of a weightless damper, F (t) is a load which changes along with time, and the motion equation of the system is obtained thereby
S3: equation data versus body-in-white construction, inertial force FIRepresentative of body-in-white structureBraking performance data of, elastic force FSRepresenting bending, cornering and torsion performance data of a body-in-white structure, damping force FDRepresenting impact load performance data for a body-in-white structure.
2. The body-in-white lightweight optimal design method according to claim 1, characterized in that: the body-in-white structure includes a bracket structure and a component structure, and the body-in-white component structure adopts GFRP mixed material.
3. The body-in-white lightweight optimal design method according to claim 2, characterized in that: the GFRP mixed material mainly comprises sheet mould pressing composite plastic (SMC), glass fiber felt reinforced thermoplastic material (GMT) and resin transfer molding compound material (RTM), wherein the material proportion SMC is as follows: GMT: RTM ranges from 0.2-0.35:0.3-0.4: 0.2-0.5.
4. The body-in-white lightweight optimal design method according to claim 2, characterized in that: the body-in-white bracket structure is made of CFRP materials, and the proportion range of the CFRP materials is 0.8-0.95.
5. The body-in-white lightweight optimal design method according to claim 2, characterized in that: the body-in-white structure is formed by hydraulic forming, internal high pressure forming, thermal forming and aluminum alloy semi-solid forming.
6. The body-in-white lightweight optimal design method according to claim 2, characterized in that: the welding mode of the body-in-white structure adopts medium frequency welding, laser welding and special welding.
7. The body-in-white lightweight optimal design method according to claim 1, characterized in that: and adjusting the material ratio according to the calculation result of the system motion equation, and starting to reduce the vehicle body quality on the premise of various qualified performance indexes.
8. The body-in-white lightweight optimal design method according to claim 1, characterized in that: finite element analysis is carried out on the body-in-white structure by adopting finite element software, and the stress of the body-in-white structure under the working conditions of braking, bending, turning, twisting and impact load is calculated.
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| CN115158510A (en) * | 2022-04-27 | 2022-10-11 | 扬州新瑞车业发展有限公司 | Design method and system for lightweight frame of automobile |
| CN115238387A (en) * | 2022-07-27 | 2022-10-25 | 中车成型科技(青岛)有限公司 | Topological lightweight method and system for mixed material of rail transit vehicle |
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| CN115158510A (en) * | 2022-04-27 | 2022-10-11 | 扬州新瑞车业发展有限公司 | Design method and system for lightweight frame of automobile |
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| CN115238387A (en) * | 2022-07-27 | 2022-10-25 | 中车成型科技(青岛)有限公司 | Topological lightweight method and system for mixed material of rail transit vehicle |
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