共查询到19条相似文献,搜索用时 250 毫秒
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为了有效降低某轻型货车油箱支架的重量,首先基于有限元方法建立油箱支架离散化模型,再采集搓板路面的时域信号,得到其激励端的频域振动加速度,并据此对其频率响应分析,分析结果表明其强度的最大应力值低于材料屈服。然后基于集成优化平台对支架的结构参数进行轻量化设计,得到其最优参数,优化结果表明其强度性能能够满足设计要求,并且其重量降低了17.1%,优化效果比较理想。最后对该油箱支架的优化方案进行实车道路耐久试验,试验结果表明其没有发生开裂失效,成功通过了整车试验验证,因此整个轻量化分析方法具有较高的可靠性,能够为同类结构的轻量化设计提供参考和借鉴。 相似文献
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主要介绍某款电动客车顶盖骨架总成轻量化方案:通过使用高强度抗屈服极限材料及优化力的传递结构两种方法进行优化顶盖骨架总成;并利用AltairHyperWorks有限元平台,对车身进行不同工况的强度分析。在满足整车强度的前提下,此车型顶盖骨架总成重量整体下降20%。 相似文献
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车架是多功能破障车非常重要的受力构件,其结构性能直接关系到整车的安全问题。建立破障车车架有限元模型,四点支撑和推土工况的静强度分析,完成样车车架应力测试试验。分析结果表明四点支撑和推土工况车架强度不足。试验结果表明各工况测点数据与有限元计算值相差较小,四点支撑工况测点1区域发生了塑性变形,推土工况测点1和测点12发生了塑性变形,验证了车架有限元分析的正确性。对车架进行优化设计,提供了三种车架改进方案,方案二为最佳方案,改进方案的车架满足工作要求,为相关车辆车架的分析研究提供了技术方法。 相似文献
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建立了某大型客车车身骨架FE模型,获取了自由模态参数以及静态弯曲和扭转工况下的刚度和强度特性。基于分析结果,对车身骨架结构形式进行了改进。利用优化设计方法,建立了以客车薄壁梁厚度为设计变量,车身总体积和表征车身刚度的状态量为响应的优化模型。通过对影响车身轻量化和力学性能指标构件的灵敏度分析,筛选了设计变量,重新建立了以车身骨架总体积最小为目标的优化模型,得到了轻量化效果明显的优化方案。最后对轻量化模型进行典型工况分析,与初始模型进行了对比,验证了优化方案的可行性。 相似文献
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基于弯曲刚度和扭转刚度的白车身优化分析 总被引:3,自引:1,他引:2
随着全球能源的日益紧缺和和制造成本增加,汽车轻量化设计已经成为汽车制造商的主流设计。为了降低白车身的重量,提出了基于刚度灵敏度的方法来实现减重。以处在开发的中后期的某款车为例,利用有限元软件Nastran进行了计算和分析。综合质量灵敏度、刚度灵敏度和优化板件的数量,提出了两种优化方案。并考虑到汽车处在的开发阶段、成本以及整车性能,选取了最佳的优化方案,在不降低汽车性能或者性能降低较小的情况下,实现了车辆的轻量化。最后对优化方案的选用原则和要求进行了总结。 相似文献
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为减少在山西中部引黄工程中应用的某翻转式闸门的制造成本,利用ANSYS软件对其进行结构轻量化设计。采用APDL建立该翻转式闸门的参数化有限元模型并对其进行静力分析,通过比较在不同开启角度下闸门所受应力和变形情况,确定出最危险的工况,并在该工况下对闸门模型进行优化分析。优化选择对闸门重量、应力和变形影响较大的参数作为设计变量,以闸门的最大应力和最大位移作为约束条件,闸门的总重量作为目标函数,通过采用几种不同的优化算法对其进行优化分析。优化结果显示:优化后闸门的总重量减轻13%,优化效果显著,且符合该闸门的强度和刚度要求,验证了该优化方法的可行性,为研究翻转式闸门的结构轻量化设计提供了有效参考。 相似文献
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Jeong Sam Han 《Journal of Mechanical Science and Technology》2013,27(9):2789-2800
Nowadays, transient dynamic responses of a large-size finite element (FE) model can be solved within a reasonable computation time owing to rapid improvement in both numerical schemes and computing resources. However, increasing demands for accurate simulation and complicated modeling have led to larger and more complex finite element models, which consequently result in considerably high computational cost. In addition, when structural optimizations include transient responses such as displacement, velocity, and acceleration, the optimizations often do not end within a reasonable process time because the large-size simulation must be repeated many times. In order to reduce the computational cost in this respect, model order reduction (MOR) for the original full-order model (FOM) can be used for the transient response simulation. In this paper, a transient dynamic response analysis using Krylov subspace-based MOR and its design sensitivity analysis with respect to sizing design variables is suggested as an approach to the handling of large-size finite element models. Large-size finite element models can incur the problem of a long computation time in gradient-based optimization iterations because of the need for repeated simulation of transient responses. In the suggested method, the reduced order models (ROMs) generated from the original FOMs using implicit moment-matching via the Arnoldi process are used to calculate the transient response and its design sensitivity. As a result, the speed of numerical computation for the transient response and its design sensitivity is maximized. Newmark’s time integration method is employed to calculate transient responses and their design sensitivities. In the case of the transient sensitivity analysis, we apply a temporal discretization scheme to the design sensitivity equation derived by directly differentiating the governing equation with respect to design variables. This methodology has been programmed on the MATLAB with the FE information extracted from the FE package ANSYS. Two application examples are provided to demonstrate the numerical accuracy and efficiency of the suggested approach. The relative errors of transient response and design sensitivity between the FOMs and ROMs are also compared according to the orders of the reduced model. Calculation of transient dynamic responses and their sensitivities using Krylov subspacebased MOR shows a sizeable reduction in computation time and a good agreement with those provided by the FOM. 相似文献
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Lightweight designs of new-energy vehicles can reduce energy consumption, thereby improving driving mileage. In this study, a lightweight design of a newly developed multi-material electric bus body structure is examined in combination with analytical target cascading (ATC). By proposing an ATC-based two-level optimization strategy, the original lightweight design problem is decomposed into the system level and three subsystem levels. The system-level optimization model is related to mass minimization with all the structural modal frequency constraints, while each subsystem-level optimization model is related to the sub-structural performance objective with sub-structure mass constraints. To enhance the interaction between two-level systems, each subsystem-level objective is reformulated as a penalty-based function coordinated with the system-level objective. To guarantee the accuracy of the model-based analysis, a finite element model is validated through experimental modal test. A sequential quadratic programming algorithm is used to address the defined optimization problem for effective convergence. Compared with the initial design, the total mass is reduced by 49 kg, and the torsional stiffness is increased by 17.5%. In addition, the obtained design is also validated through strength analysis. 相似文献
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胶接接头中总存在胶瘤,由于建模复杂,胶接接头有限元分析中胶瘤常被忽略.但胶瘤能减少峰值应力,提高结构强度和刚度.为此,提出一种简化的胶接有限元模型,即用壳单元代表胶瘤,体单元代表被粘体和胶层,并用弹性理论建立壳单元等效厚度公式.以体单元精细模型结果作为对比的真实解,考察五种载荷工况下,单搭接头简化有限元模型的胶层应力和刚度.分析表明,壳单元等效厚度公式正确,胶接简化有限元模型精度高,可用于诸如汽车等大型结构中;用壳单元简单模型可定量分析胶瘤大小和形状对接头应力和总体刚度性能的影响. 相似文献
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负重轮轮盘结构优化减重分析 总被引:1,自引:0,他引:1
建立了负重轮有限元结构优化模型,并进行了试验验证。在对优化算法进行分析的基础上,以计算结果中表示负重轮轮盘刚度和强度的应力值与变形量为约束条件,把负重轮轮盘重量设为目标函数,对负重轮进行了有效的结构优化,使负重轮的受力状况得到显著改善,且重量减轻10%以上,从而为工程中进行其他优化分析提供了理论与实践参考依据。 相似文献