共查询到18条相似文献,搜索用时 156 毫秒
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为解决大兆瓦风电机组主机架研发难度大、周期长的问题,采用贯穿主机架全生命周期的多阶段多目标优化方法进行研发设计.在概念设计阶段侧重于获得主机架初始构型,以机架材料分布为设计变量,以材料体积为约束条件,以各工况极限强度为目标进行拓扑优化;在详细设计阶段侧重于机架的轻量化,以主机架结构尺寸为设计变量,以疲劳性能为约束条件,以各工况极限强度和机架质量最小为目标进行参数优化.分析结果表明:通过该方法得到的主机架不仅能满足设计要求,而且可以大大缩短研发周期、提高研发效率. 相似文献
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基于Hyperworks的平衡轴支架拓扑优化设计 总被引:2,自引:0,他引:2
拓扑优化是一种根据载荷、约束及优化目标寻求结构材料最佳分配的优化方法,既可用于全新产品的概念设计,又可用于已有产品的改进设计;基于Hyperworks平台采用变密度法进行重卡平衡轴支架的拓扑优化设计,对优化后的重卡平衡轴支架进行有限元分析,将其应力分布、质量与原设计做比较;研究表明,经拓扑优化后的重卡平衡轴悬轴支架,应力大小大幅度减少,应力分布更加均匀,质量大幅度减少,实现了轻量化,为平衡轴支架结构的改进设计提供了重要的技术信息。 相似文献
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本文主要介绍Optistruct软件优化方法在结构设计改进中的应用。通过使用拓扑优化和形貌优化方法对一款摩托车后挡泥板进行结构优化。使用自由形状优化方法对发动机减震衬套的截面进行优化。 相似文献
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针对T形结构传统设计周期长、材料利用率低、设计成本高等问题,使用SolidWorks建立数字模型,将其转换成ANSYS Workbench可读的格式文件,进行拓扑优化设计。对T形结构在载荷作用下进行最优化设计,建立以单元材料密度为设计变量,以结构最小柔顺度为目标函数,以质量减少百分比为约束函数的数学模型。采用ANSYS Workbench的Topology Optimization模块进行拓扑优化设计,对比优化前、后结构的应力和变形,可知运用拓扑优化技术实现T形结构的轻量化设计合理有效。 相似文献
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为实现地铁车辆转向架的轻量化设计,参照国际标准UIC 615-4,计算某地铁车辆转向架构架的主要载荷.将垂向载荷、横向载荷和纵向载荷等6种载荷组合成5种超常载荷工况,经有限元强度分析,找出应力薄弱点.通过优化模型的建立和OptiStruct的优化,实现转向架构架的轻量化设计,总质量减轻约12%. 相似文献
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Ji-Hong Zhu Jie Hou Wei-Hong Zhang Yu Li 《Structural and Multidisciplinary Optimization》2014,50(4):561-571
This paper addresses an important problem of design constraints on fastener joint loads that are well recognized in the design of assembled aircraft structures. To avoid the failure of fastener joints, standard topology optimization is extended not only to minimize the structural compliance but also to control shear loads intensities over fasteners. It is shown that the underlying design scheme is to ameliorate the stiffness distribution over the structure in accordance with the control of load distributions over fastener joints. Typical examples are studied by means of topology optimization with joint load constraints and the standard compliance design. The effects of joint load constraints are highlighted by comparing numerical optimization results obtained by both methods. Meanwhile, resin models of optimized designs are fabricated by rapid prototyping process for loading test experiments to make sure the effectiveness of the proposed method. 相似文献
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A practical optimization method is applied to design nonlinear truss-like structures subjected to seismic excitation. To achieve minimum weight design, inefficient material is gradually shifted from strong parts to weak parts of a structure until a state of uniform deformation prevails. By considering different truss structures, effects of seismic excitation, target ductility and buckling of the compression members on optimum topology are investigated. It is shown that the proposed method could lead to 60% less structural weight compared to optimization methods based on elastic behavior and equivalent static loads, and is efficient at controlling performance parameters under a design earthquake. 相似文献
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Optimal topology design of structures under dynamic loads 总被引:1,自引:1,他引:0
S. Min N. Kikuchi Y. C. Park S. Kim S. Chang 《Structural and Multidisciplinary Optimization》1999,17(2-3):208-218
When elastic structures are subjected to dynamic loads, a propagation problem is considered to predict structural transient response. To achieve better dynamic performance, it is important to establish an optimum structural design method. Previous work focused on minimizing the structural weight subject to dynamic constraints on displacement, stress, frequency, and member size. Even though these methods made it possible to obtain the optimal size and shape of a structure, it is necessary to obtain an optimal topology for a truly optimal design. In this paper, the homogenization design method is utilized to generate the optimal topology for structures and an explicit direct integration scheme is employed to solve the linear transient problems. The optimization problem is formulated to find the best configuration of structures that minimizes the dynamic compliance within a specified time interval. Examples demonstrate that the homogenization design method can be extended to the optimal topology design method of structures under impact loads.Presented at WCSMO-2, held in Zakopane, Poland, 1997 相似文献
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In this paper, a sequential coupling of two-dimensional (2D) optimal topology and shape design is proposed so that a coarsely
discretized and optimized topology is the initial guess for the following shape optimization. In between, we approximate the
optimized topology by piecewise Bézier shapes via least square fitting. For the topology optimization, we use the steepest
descent method. The state problem is a nonlinear Poisson equation discretized by the finite element method and eliminated
within Newton iterations, while the particular linear systems are solved using a multigrid preconditioned conjugate gradients
method. The shape optimization is also solved in a multilevel fashion, where at each level the sequential quadratic programming
is employed. We further propose an adjoint sensitivity analysis method for the nested nonlinear state system. At the end,
the machinery is applied to optimal design of a direct electric current electromagnet. The results correspond to physical
experiments.
This research has been supported by the Austrian Science Fund FWF within the SFB “Numerical and Symbolic Scientific Computing”
under the grant SFB F013, subprojects F1309 and F1315, by the Czech Ministry of Education under the grant AVČR 1ET400300415,
by the Czech Grant Agency under the grant GAČR 201/05/P008 and by the Slovak Grant Agency under the project VEGA 1/0262/03. 相似文献
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柔性变形机翼后缘拓扑优化设计 总被引:2,自引:0,他引:2
为了实现机翼表面的自适应变形和结构轻量化,将柔件机构引入到机翼后缘形状变化结构设计中.应用连续体拓扑优化技术,以实际位移与目标位移之间的偏差为目标函数,材料用量为约束,建立SIMP(solid isotropic material with penalization)密度刚度插值模型.采用Matlab编程对柔性机构进行了优化设计,并对不同参数下的优化结果进行了讨论,最后进行机构的仿真分析.研究结果显示该柔性机构能够实现预期的形状变化,证明了方法的正确性,为柔性机翼设计提供理论基础. 相似文献
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A performance index for topology and shape optimization of plate bending problems with displacement constraints 总被引:1,自引:0,他引:1
This paper presents a performance index for topology and shape optimization of plate bending problems with displacement constraints.
The performance index is developed based on the scaling design approach. This performance index is used in the Performance-Based
Optimization (PBO) method for plates in bending to keep track of the performance history when inefficient material is gradually
removed from the design and to identify optimal topologies and shapes from the optimization process. Several examples are
provided to illustrate the validity and effectiveness of the proposed performance index for topology and shape optimization
of bending plates with single and multiple displacement constraints under various loading conditions. The topology optimization
and shape optimization are undertaken for the same plate in bending, and the results are evaluated by using the performance
index. The proposed performance index is also employed to compare the efficiency of topologies and shapes produced by different
optimization methods. It is demonstrated that the performance index developed is an effective indicator of material efficiency
for bending plates. From the manufacturing and efficient point of view, the shape optimization technique is recommended for
the optimization of plates in bending.
Received November 27, 1998?Revised version received June 6, 1999 相似文献
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Jiadong Deng Jun Yan Gengdong Cheng 《Structural and Multidisciplinary Optimization》2013,47(4):583-597
The present paper studies multi-objective design of lightweight thermoelastic structure composed of homogeneous porous material. The concurrent optimization model is applied to design the topologies of light weight structures and of the material microstructure. The multi-objective optimization formulation attempts to find minimum structural compliance under only mechanical loads and minimum thermal expansion of the surfaces we are interested in under only thermo loads. The proposed optimization model is applied to a sandwich elliptically curved shell structure, an axisymmetric structure and a 3D structure. The advantage of the concurrent optimization model to single scale topology optimization model in improving the multi-objective performances of the thermoelastic structures is investigated. The influences of available material volume fraction and weighting coefficients are also discussed. Numerical examples demonstrate that the porous material is conducive to enhance the multi-objective performance of the thermoelastic structures in some cases, especially when lightweight structure is emphasized. An “optimal” material volume fraction is observed in some numerical examples. 相似文献