CN105718674A - Car torsion beam rear axle lightweight design method - Google Patents
Car torsion beam rear axle lightweight design method Download PDFInfo
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- CN105718674A CN105718674A CN201610044671.7A CN201610044671A CN105718674A CN 105718674 A CN105718674 A CN 105718674A CN 201610044671 A CN201610044671 A CN 201610044671A CN 105718674 A CN105718674 A CN 105718674A
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- G—PHYSICS
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/15—Vehicle, aircraft or watercraft design
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/13—Architectural design, e.g. computer-aided architectural design [CAAD] related to design of buildings, bridges, landscapes, production plants or roads
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Abstract
The invention discloses a car torsion beam rear axle lightweight design method. A conventional rear axle structure is optimized by using a topological optimization method; by optimizing design theories and taking boundary conditions of static load working conditions, load situations, various working conditions and constraint conditions such as strength, rigidity and inherent frequency which need to be met under various working conditions into account, a computer virtual analysis technique is adopted to analyze and optimize a rear axle structure, and optimal structures and properties can be achieved.
Description
Technical field
The invention belongs to automobile technical field, particularly relate to a kind of car torsion beam rear axle light-weight design method.
Background technology
Along with the development of automobile industry, auto industry faces the energy-conservation outstanding problem with environmental protection of sternness.Between Abgasgesetz and the automobile vendor of increasingly stringent, keen competition promotes automotive engineering constantly to develop to the direction of more energy efficient, environmental protection, safety.Improve fuel economy to reduce oil consumption, emissions-reducing become the two large problems that World Auto Industry circle is urgently to be resolved hurrily.Greatly develop automotive light weight technology technology, under ensureing the premise of vehicle safety and other key propertys, realize energy-saving and emission-reduction by alleviating automobile own wt.And engine technology immature in current new-energy automobile technology promotes under the background that difficulty strengthens day by day, no matter to conventional fuel oil automobile, or new-energy automobile, automotive light weight technology technology is all the Key technology of a general character.
Summary of the invention
The technical problem to be solved is to provide one and determines car torsion beam rear axle Rational structure, achieves part lightweight target, meet the boundary condition under static load operating mode, optimize rear axle structure, meet the car torsion beam rear axle light-weight design method that structure optimum, performance are best.
In order to solve above-mentioned technical problem, the technical solution adopted in the present invention is: a kind of car torsion beam rear axle light-weight design method, comprises the steps:
1) the back axle scheme modifying adopted according to vehicle body is simplified model, remains the position of wheel hub, hinge connection, spring base, damping；
2) utilize 3 d modeling software to import in finite element software by parameterized model, it is determined that the design space of back axle topological optimization, design space is divided into design domain and non-design domain, as initial designs territory；
3) building topology optimized mathematical model:
Model is carried out stress and strain model, design domain is analyzed；
The intensity that needs under the various operating modes that run into and each operating mode when determining the boundary condition under back axle static load operating mode, load condition and travel to meet, rigidity, natural frequency constraints；
4) iterative:
To reduce for the purpose of structural material, lightweight, after computed in software, obtain topological optimization the best lightweight structure.
What the reinforcing rib structure at wheel hub Yu hinged place disclosure satisfy that static load bears the rigidity of structure needed for static load load.
In above-mentioned 3rd step, static load operating mode force analysis: when being fully loaded with static, vertical force is maximum, and longitudinal force is 0, and side force is 0, and now vertical force maximum is:In formula, k is dynamic load factor, and car takes 1.75, and lorry takes 2.0；G2Refer to drive axle maximum static axle load
Calculate back axle axle load and take 6000N, i.e. G2=6000N；Then vertical force is 5100N.
A technical scheme in technique scheme has the advantage that or beneficial effect, the constraintss such as the intensity that needs under the various operating modes run into when considering the boundary condition under static load operating mode, load condition and travel and each operating mode to meet, rigidity, natural frequency, obtain topological optimization the best lightweight structure after computed in software.
Accompanying drawing explanation
Fig. 1 is the structural representation in the initial designs territory of the car torsion beam rear axle light-weight design method of offer in the embodiment of the present invention；
Fig. 2 is the structural representation of the initial designs territory of Fig. 1 in finite element software and stress and strain model；
Fig. 3 is the schematic diagram of the finite element software optimum results of Fig. 1；
Fig. 4 is the schematic diagram of the finite element software optimum results of Fig. 1；
Fig. 5 is the final three-dimensional model diagram after optimizing；
Fig. 6 is back axle stressing conditions figure；
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
The constraintss such as the intensity that needs under various operating modes that the present invention runs into when being and consider boundary condition under static load operating mode, load condition and travel and each operating mode to meet, rigidity, natural frequency, obtain topological optimization the best lightweight structure after computed in software.
Referring to Fig. 1, it is determined by the design space of back axle topological optimization, design space is divided into design domain and non-design domain, determine need under displacement boundary conditions when back axle is fully loaded with traveling, load condition and startup or damped condition to meet intensity, rigidity, the constraints such as natural frequency, after computed in software, obtain topological optimization the best lightweight structure.
This structure is the simplified model under static load operating mode after topological optimization, this structure is when meeting above-mentioned requirements as can be seen from Figure, achieving the purpose reducing structural material, what the reinforcing rib structure at wheel hub Yu hinged place disclosure satisfy that static load bears the rigidity of structure needed for static load load.
Specifically comprise the following steps that
1) the back axle scheme modifying adopted according to vehicle body is simplified model, remains the position of wheel hub, hinge connection, spring base, damping；
2) utilize 3 d modeling software to import in finite element software by parameterized model, it is determined that the design space of back axle topological optimization, design space is divided into design domain and non-design domain, as initial designs territory；As shown in Figure 1；
3) building topology optimized mathematical model:
Model is carried out stress and strain model, design domain is analyzed；As shown in Figure 2；
The intensity that needs under the various operating modes that run into and each operating mode when determining the boundary condition under back axle static load operating mode, load condition and travel to meet, rigidity, natural frequency constraints；
4) iterative:
To reduce for the purpose of structural material, lightweight, after computed in software, obtain topological optimization the best lightweight structure；As shown in Figures 3 and 4.Cad model is created, as shown in Figure 5 according to topological optimization result.
What the reinforcing rib structure at wheel hub Yu hinged place disclosure satisfy that static load bears the rigidity of structure needed for static load load.
The stressing conditions of rear axle structure is as shown in Figure 6；
Degree of freedom is constrained to both sides hub centre and the translation in constraint three directions of x, y, z, center, hinged place.
Static load operating mode force analysis: when fully loaded static or automobile pass through uneven road surface, vertical force Fz2Maximum, longitudinal force Fx2=0, side force Fy2=0, now vertical force maximum Fz2For:In formula, k is dynamic load factor, and car takes 1.75, and lorry takes 2.0；G2 refers to drive axle maximum static axle load, this time calculates back axle axle load and takes 6000N, i.e. G2=6000N.Then according to formula:
After adopting above-mentioned scheme, the constraintss such as the intensity that needs under the various operating modes run into when considering the boundary condition under static load operating mode, load condition and travel and each operating mode to meet, rigidity, natural frequency, obtain topological optimization the best lightweight structure after computed in software.
Above in conjunction with accompanying drawing, the present invention is exemplarily described; the obvious present invention implements and is not subject to the restrictions described above; as long as have employed the improvement of the various unsubstantialities that the design of the method for the present invention carries out with technical scheme; or the not improved design by the present invention and technical scheme directly apply to other occasion, all within protection scope of the present invention.
Claims (4)
1. a car torsion beam rear axle light-weight design method, it is characterised in that comprise the steps:
1) the back axle scheme modifying adopted according to vehicle body is simplified model, remains the position of wheel hub, hinge connection, spring base, damping；
2) utilize 3 d modeling software to import in finite element software by parameterized model, it is determined that the design space of back axle topological optimization, design space is divided into design domain and non-design domain, as initial designs territory；
3) building topology optimized mathematical model:
Model is carried out stress and strain model, design domain is analyzed；
The intensity that needs under the various operating modes that run into and each operating mode when determining the boundary condition under back axle static load operating mode, load condition and travel to meet, rigidity, natural frequency constraints；
4) iterative:
To reduce for the purpose of structural material, lightweight, after computed in software, obtain topological optimization the best lightweight structure.
2. car torsion beam rear axle light-weight design method as claimed in claim 1, it is characterised in that what the reinforcing rib structure at wheel hub Yu hinged place disclosure satisfy that static load bears the rigidity of structure needed for static load load.
3. car torsion beam rear axle light-weight design method as claimed in claim 2, it is characterised in that in above-mentioned 3rd step, static load operating mode force analysis: when being fully loaded with static, vertical force is maximum, and longitudinal force is 0, and side force is 0, and now vertical force maximum is:In formula, k is dynamic load factor, and car takes 1.75, and lorry takes 2.0；G2Refer to drive axle maximum static axle load.
4. car torsion beam rear axle light-weight design method as claimed in claim 3, it is characterised in that calculate back axle axle load and take 6000N, i.e. G2=6000N；Then vertical force is 5100N.
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| CN201610044671.7A CN105718674A (en) | 2016-01-22 | 2016-01-22 | Car torsion beam rear axle lightweight design method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109359372A (en) * | 2018-10-09 | 2019-02-19 | 苏州科技大学 | Consider structure-load-boundary coupling influence Structural Topology Optimization Design method |
| CN109409023A (en) * | 2018-12-24 | 2019-03-01 | 爱驰汽车有限公司 | The optimization method of torsion BOX Model, system and storage medium after automobile based on CAE |
| CN111204185A (en) * | 2018-11-22 | 2020-05-29 | 宝沃汽车（中国）有限公司 | Arrangement method of spring trays of torsion beam |
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| CN103399999A (en) * | 2013-07-30 | 2013-11-20 | 青岛理工大学 | Design method of formula car structure |
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| US20090319453A1 (en) * | 2008-06-24 | 2009-12-24 | Livermore Software Technology Corporation | Sampling Strategy Using Genetic Algorithms in Engineering Design Optimization |
| CN103399999A (en) * | 2013-07-30 | 2013-11-20 | 青岛理工大学 | Design method of formula car structure |
| CN104077434A (en) * | 2014-06-09 | 2014-10-01 | 国家超级计算深圳中心(深圳云计算中心) | CAE (Computer Aided Engineering) analysis based product structure optimization method and system |
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| 左曙光: "扭杆梁后桥结构轻量化分析", 《同济大学学报(自然科学版)》 * |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109359372A (en) * | 2018-10-09 | 2019-02-19 | 苏州科技大学 | Consider structure-load-boundary coupling influence Structural Topology Optimization Design method |
| CN111204185A (en) * | 2018-11-22 | 2020-05-29 | 宝沃汽车（中国）有限公司 | Arrangement method of spring trays of torsion beam |
| CN109409023A (en) * | 2018-12-24 | 2019-03-01 | 爱驰汽车有限公司 | The optimization method of torsion BOX Model, system and storage medium after automobile based on CAE |
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