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1. 发明公开

EP2393026A3 Systems and methods of performing vibro-acoustic analysis of a structure 审中-公开
标题翻译：用于执行结构的振动声学分析的系统和方法
公开(公告)号：EP2393026A3
公开(公告)日：2014-03-05
申请号：EP11167599.7
申请日：2011-05-26
申请人： Livermore Software Technology Corporation
发明人： Huang, Yun , Souli, Mhamed , Cleveland Ashcraft, C.
IPC分类号： G06F17/50
CPC分类号： G06F17/5018
摘要： Methods and systems for simulating acoustic field resulted from particular excitations by performing vibro-acoustic analysis of a structure are disclosed. According to one aspect of the present invention, vibro-acoustic analysis of a structure is performed in two stages. First, steady state dynamic (SSD) responses are obtained using a finite element analysis model of a structure subject to harmonic excitations (e.g., external nodal loads, pressures, or enforced motions (e.g., ground motions), etc.). The steady state responses are the results (e.g., nodal velocities at desired locations of the structure) obtained in a finite element analysis in frequency-domain. Second, an acoustic analysis is conducted according to Helmholtz equation using the nodal velocities obtained at desired locations on the structure as a boundary condition. The acoustic analysis can be performed in a number of procedures (e.g., boundary element method, Rayleigh approximation method, etc.).

2. 发明公开

EP2669827A2 Numerical simulation of a structure having a heat-affected zone using a finite element analysis model 审中-公开
标题翻译：数值模拟einer Struktur mit区域Wärmeeinflussmittels eines Analysemodells finiter Elemente
公开(公告)号：EP2669827A2
公开(公告)日：2013-12-04
申请号：EP13157976.5
申请日：2013-03-06
申请人： Livermore Software Technology Corporation
发明人： Hallquist, John O.
IPC分类号： G06F17/50
CPC分类号： G06F17/5018
摘要： Methods and systems for conducting numerical simulation of a structure having heat affected zones (HAZ) using a finite element anaysis (FEA) model are disclosed. A FEA model that includes at least a group of finite elements representing a welded structural part that encompasses at least one HAZ is defined and received in a computer system. Each finite element in the group is configured with at least one integration point according to FEA. The group of finite elements is associated with a set of HAZ material properties representing structural behavior of the welded structural part inside and outside the HAZ. Corresponding material properties are then determined and assigned to each integration point by interpolating the associated set using the shortest heat-propagation distance between each integration point and the heat source locations (e.g., spotwelds' centroid) with an automated procedure that requires no additional input after the HAZ material properties have been defined.
摘要翻译：公开了使用有限元分析（FEA）模型对具有热影响区（HAZ）的结构进行数值模拟的方法和系统。在计算机系统中定义并接收至少包括一组表示包含至少一个HAZ的焊接结构部件的有限元素的FEA模型。根据FEA，组中的每个有限元配置有至少一个积分点。有限元组与一组HAZ材料属性相关联，表示HAZ内外焊接结构部件的结构特性。然后通过使用在每个积分点和热源位置之间的最短热传播距离（例如，点焊质心）通过内插相关联的集合来确定相应材料属性并将其分配给每个积分点，其中自动化过程不需要额外的输入已经定义了HAZ材料性质。

3. 发明公开

EP2669826A2 Trim line determination in a deep draw manufacturing of a sheet metal part 审中-公开
标题翻译：施泰因恩史密斯
公开(公告)号：EP2669826A2
公开(公告)日：2013-12-04
申请号：EP13157949.2
申请日：2013-03-06
申请人： Livermore Software Technology Corporation
发明人： Zhu, Xinhai , Zhang, Li
IPC分类号： G06F17/50
CPC分类号： G06F17/5018 , Y02T10/82
摘要： Methods and systems of determining a trim line in deep draw manufacturing of a sheet metal part are disclosed. A computerized model of a sheet metal part and the addendum surface geometry are defined. At least one flange portion in the computerized model is identified. A numerical simulation of unfolding of the flange towards the addendum surface by applying a first set of numerical loads to each pair of adjacent finite elements is performed. The first set of numerical loads is configured for flattening out a given pair of finite elements with a bending moment determined using relative orientations of the pair finite elements and material properties of the part. A second set of numerical loads is applied to close any remaining gap between the unfolded flange and the addendum thereafter. The outer edge of the flange portions in their final unfolded configuration is designated as a trim line.
摘要翻译：公开了一种确定钣金件的深拉制造中的修剪线的方法和系统。定义了钣金零件和附件表面几何的计算机化模型。识别计算机化模型中的至少一个凸缘部分。执行通过对每对相邻有限元件施加第一组数值载荷来将凸缘展开到齿顶表面的数值模拟。第一组数值载荷被配置成用给定的一对有限元平坦化，其弯曲力矩是使用该对有限元件的相对取向和零件的材料特性确定的。应用第二组数值载荷来封闭未折叠法兰和附件之间的剩余间隙。凸缘部分的最终展开构造的外边缘被指定为修剪线。

4. 发明公开

EP2608086A2 Systems and Methods of Designing Airbag 审中-公开
标题翻译：系统和Verfahren zum Entwerfen eines安全气囊
公开(公告)号：EP2608086A2
公开(公告)日：2013-06-26
申请号：EP12188465.4
申请日：2012-10-15
申请人： Livermore Software Technology Corporation
发明人： Bhalsod, Dilip Mulji
IPC分类号： G06F17/50 , H02J3/38 , B60R21/16
CPC分类号： G06F17/5018 , B60R21/16
摘要： Systems and methods for numerically creating corresponding 2-D mesh models for a plurality of airbag fabric panels from a 3-D computerized model of a fully-inflated airbag are disclosed. The 3-D computerized model comprises a plurality of nodes and a plurality of shell finite elements. Each shell element is categorized as to which one of a plurality of fabric panels that form the airbag it belongs. Each fabric panel occupies a continuous surface area of the airbag. Shell finite elements of a particular fabric panel are unfolded to a 2-D mesh one fabric panel at a time. The total surface area of a particular fabric panel is compared with the total area of the corresponding 2-D model. The 2-D mesh model is adjusted until the areas are within a predetermined tolerance. The final "total-area-matched" 2-D mesh model is further orientated to a fabric material coordinate system of warp and weft for determining manufacturability.
摘要翻译：公开了一种用于从完全充气的气囊的3-D计算机化模型数字地创建用于多个气囊织物面板的相应的2-D网格模型的系统和方法。 3-D计算机化模型包括多个节点和多个壳体有限元。每个外壳元件被分类为形成其所属气囊的多个织物面板中的哪一个。每个织物面板占据气囊的连续表面积。特定织物面板的壳体有限元素一次展开为2-D网格的一个织物面板。将特定织物面板的总表面积与相应的2-D模型的总面积进行比较。调整2-D网格模型，直到区域在预定的公差内。最终的“总面积匹配”2-D网格模型进一步定向为用于确定可制造性的经纱和纬纱的织物材料坐标系。

5. 发明公开

EP2393027A2 Curve matching for parameter identification 审中-公开
标题翻译： Kurvenanpassung zur Parameteridentifizierung
公开(公告)号：EP2393027A2
公开(公告)日：2011-12-07
申请号：EP11167629.2
申请日：2011-05-26
申请人： Livermore Software Technology Corporation
发明人： Witowski, Katharina , Stander, Nielen
IPC分类号： G06F17/50
CPC分类号： G06F17/5009
摘要： Methods and systems for matching a computed curve (304) to a target curve (302) to enable realistic engineering simulations are disclosed. Optimization of parameter identification is achieved by adjusting the parametric inputs of a simulation model such that the discrepancy between the two curves (302, 304) is minimized. Because the points (312, 316) on the two curves (302, 304) to be matched are paired, matching of any two open curves, including hysteretic curves, can be handled. Curves that are completely set apart in their original coordinates can be merged to a common coordinate system for parameter identification without the computational instability problems. A partial matching scheme (410g) is used for mapping points (312) defining the shorter one of the two curves (302, 304) to a set of mapped points (316) on the longer one. One or more offsets (320) from the first point of the longer curve (304) are used for multiple attempts (401g) to find a best fit.
摘要翻译：公开了用于将计算曲线（304）与目标曲线（302）匹配以实现实际工程仿真的方法和系统。通过调整模拟模型的参数输入使两个曲线（302,304）之间的差异最小化来实现参数识别的优化。因为要匹配的两条曲线（302,304）上的点（312,316）配对，所以可以处理任何两条开放曲线（包括滞后曲线）的匹配。在原始坐标下完全分开的曲线可以合并到一个公共的坐标系中进行参数识别，而不会造成计算不稳定性问题。部分匹配方案（410g）用于将两条曲线（302,304）中较短的一条曲线定义成较长的一组映射点（316）的映射点（312）。从较长曲线（304）的第一点起的一个或多个偏移（320）用于多次尝试（401g）以找到最佳拟合。

6. 发明公开

EP2249266A3 Methods and systems for simulating beam element to surface mesh contacts in finite element analysis 审中-公开
标题翻译：的方法和系统用于模拟杆元件和在有限元分析Flemente一个表面网格之间的接触
公开(公告)号：EP2249266A3
公开(公告)日：2011-07-06
申请号：EP10159103.0
申请日：2010-04-06
申请人： Livermore Software Technology Corporation
发明人： Hallquist, John O.
IPC分类号： G06F17/50
CPC分类号： G06F17/5018
摘要： Methods and systems for simulating beam-to-surface contacts in finite element analysis (FEA) are disclosed. A FEA model contains at least one beam element and at least one surface mesh. Surface mesh comprises a plurality of two-dimensional finite elements having arbitrary mesh density. A minimum characteristic length (CL) of the surface mesh is calculated. One or more interior points are defined for those beam elements with length longer than CL. For every nodal point (i.e., end nodes and interior points if any), a parametric coordinate between 0 and 1 inclusive is established and kept constant throughout the FEA analysis. Distributed nodal masses are used for calculating a stiffness value for calculating nodal force to resist penetration. Initial penetration with the surface mesh at each nodal point along the beam element is compensated with a set of displacements subtracting from the initial nodal displacements, such that the compensational forces remain at zero as the nodal point's initial interpenetration decreases.

7. 发明公开

EP2251805A2 Improved topology optimization for designing engineering product 审中-公开
标题翻译： Verbesserte Topologieoptimierung zum Gestalten eines industrietechnischen Produkts
公开(公告)号：EP2251805A2
公开(公告)日：2010-11-17
申请号：EP10155747.8
申请日：2010-03-08
申请人： Livermore Software Technology Corporation
发明人： Goel, Tushar , Roux, William J.
IPC分类号： G06F17/50
CPC分类号： G06F17/5095 , G06F17/5018
摘要： Improved topology optimization for engineering product design is disclosed. An engineering product including a design domain to be optimized is defined. Design domain can be a portion of or the entire engineering product. Design objective and optional constraint are also defined such that optimization goal can be achieved. Additionally, initial configuration of the design domain is represented by a finite element analysis (FEA) mesh. Each element or element group is associated with a design variable. A set of discrete material models is created from the baseline material used for the design domain. The set of discrete material models is configured to cover entire range of the design variable and each discrete material model represents a nonoverlapping portion. Each element representing the design domain is associated with an appropriate discrete material model according to the design variable. Structure response of entire engineering product is obtained via FEA to evaluate design objective and update design variable.
摘要翻译：公开了改进的工程产品设计拓扑优化。定义了包括要优化的设计域的工程产品。设计领域可以是整个工程产品的一部分。还定义了设计目标和可选约束，从而可以实现优化目标。另外，设计域的初始配置由有限元分析（FEA）网格表示。每个元素或元素组与设计变量相关联。从设计领域使用的基准材料创建一组离散材料模型。该组离散材料模型被配置为覆盖设计变量的整个范围，并且每个离散材料模型表示非重叠部分。表示设计域的每个元素都与根据设计变量的适当的离散材料模型相关联。通过FEA获得整个工程产品的结构响应，以评估设计目标和更新设计变量。

8. 发明公开

EP2191928A1 Method of, computer readable medium and system for determination of spot weld failure using finite element analysis with stress and location sensitivity scale factors 有权
标题翻译：一种方法，计算机程序和系统，用于使用具有电压和Ortskalafaktoren有限元分析确定点焊焊点故障
公开(公告)号：EP2191928A1
公开(公告)日：2010-06-02
申请号：EP09011220.2
申请日：2009-09-01
申请人： Livermore Software Technology Corporation
发明人： Hallquist, John Q.
IPC分类号： B23K31/12 , G01N3/00 , G06F17/50 , B23K11/34
CPC分类号： B23K31/12 , B23K11/34 , G01N3/00 , G01N2203/0296
摘要： Each spot weld (110a-n) in a structure (100) is represented by a cluster of at least one solid element in a finite element analysis model of the structure. Each spot weld (110a-n) is used for tying together two parts (122,124). Each of the two parts (122,124) are generally represented or modeled as a number of two-dimension shell elements. Since the tie-connection between the spot weld (110a-n) and the two parts (122,124) can be located arbitrarily within the respective part (122,124), the shell elements representing the two parts (122,124) do not have to be aligned in space. The only requirement is the two shell elements must be overlapped each other such that the spot weld (110a-n) can tie the two shell elements (i.e., one from each part) together. A spot weld failure criterion used for determining failure including shear and axial stresses acted on the spot weld (110a-n), shell element size and spot weld (110a-n) location sensitivity scale factors and strain rate effect.
摘要翻译：在结构（100），每个点焊焊点（110A-N）是通过至少一种固体元件在结构的有限元分析模型中的簇代表。每个点焊焊点（110A-N）用于两个部分（122,124）捆扎在一起。每两个部分（122,124）的被表示或建模成数二维壳单元的基因的反弹。由于点焊焊点（110A-N）和所述两个部件（122,124）之间的配合连接，可以任意的respectivement部分（122,124）内的位置，表示所述两个部分（122,124）的壳单元不必在对齐空间。唯一的要求是在两个壳单元必须重叠海誓山盟检查没有点焊（110A-N）可以配合在两个壳单元（即，一个从每一部分）一起使用。用于确定性采矿失败包括剪切力和轴向应力甲点焊焊点故障标准作用于点焊焊点（110A-N），壳单元的尺寸和点焊焊点（110A-N）的位置敏感比例因子和应变率效应。

9. 发明授权

EP2219124B1 Thermal fluid-structure interaction simulation in finite element analysis 有权
标题翻译：模拟einer thermischen流体 - Struktur-Kopplung durch有限元分析
公开(公告)号：EP2219124B1
公开(公告)日：2017-03-15
申请号：EP09016103.5
申请日：2009-12-29
申请人： Livermore Software Technology Corporation
发明人： Shapiro, Arthur B.
IPC分类号： G06F17/50
CPC分类号： G06F17/5018 , G06F2217/16 , G06F2217/80

10. 发明公开

EP2249267A3 Neighborhood determination methods and systems in computer aided engineering analysis 审中-公开
标题翻译：方法和系统近邻判断在计算机辅助工程分析
公开(公告)号：EP2249267A3
公开(公告)日：2014-01-08
申请号：EP10159116.2
申请日：2010-04-06
申请人： Livermore Software Technology Corporation
发明人： Goel, Tushar
IPC分类号： G06F17/50
CPC分类号： G06F17/5018
摘要： Improved methods and systems for a neighborhood determination in computer aided engineering analysis are disclosed. According to one aspect, a list of neighbor elements is created for a base clement of a grid model representing a structure or an engineering product. The representative node's coordinates of the base element are calculated using corner nodes of the base element. A characteristic length is assigned to the base element. The characteristic length can be determined by users of the computer aided analysis, or be calculated using geometry of the base element. The characteristic length and the representative node collectively define a surface boundary that divides elements in the grid model into two groups. The first group contains potential neighbors, while the second group contains non-neighbors. Only elements in the first group are further processed using traditional procedures to determine whether each of them is indeed a neighbor element according to one of the neighborhood determination criteria.

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