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1. 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

2. 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.

3. 发明公开

EP2587392A2 Methods and systems for numerically simulating muscle movements along bones and around joints 审中-公开
标题翻译：方法和系统的肌肉运动的数值模拟沿着骨骼和周围关节周围
公开(公告)号：EP2587392A2
公开(公告)日：2013-05-01
申请号：EP12188464.7
申请日：2012-10-15
申请人： Livermore Software Technology Corporation
发明人： Erhart, Tobias
IPC分类号： G06F17/50
CPC分类号： G06F17/5018
摘要： Systems and methods for numerically simulating muscle's movements along bones and around joints are disclosed. A computerized model containing a plurality of truss elements along with one or more rollers is used. The truss elements are configured for modeling a muscle strand while each roller is configured for a joint. Each truss element includes two end nodes and is configured or associated with a muscle biomechanical property model. Each roller is fixed at the location of a corresponding joint. To simulate the muscle strand movements around the joint, each pair of truss elements straddling a roller is adjusted dynamically in a time-marching simulation (e.g., computer simulation of an impact event of an automobile and one or more occupants). Adjustments are performed at each solution cycle of the time-marching simulation. Adjustments include two types - "slipping" and "swapping".
摘要翻译：对于数字模拟肌肉的运动沿着骨骼及关节周围的系统和方法是游离缺失盘。一种计算机化模型含桁架元件地连同一个或多个辊的多元性被使用。桁架元件被配置成用于当每个辊子被配置用于联合建模肌肉海滩。每个桁架元件包括两个端节点，并且被配置或与肌肉生物力学性能模型相关联。每个滚子被固定在接头处对应的位置。为了模拟关节周围的肌肉海滩的运动，每对桁架元件横跨辊的是在时间推进模拟动态地调整（例如，汽车和一个或多个乘员的冲击事件的计算机模拟）。调整在时间推进模拟的每个解法周期进行。调整包括两种类型 - “打滑”和“交换”。

4. 发明授权

EP2191928B1 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：EP2191928B1
公开(公告)日：2013-03-20
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

5. 发明公开

EP2390801A1 Hybrid element enabling finite element/smoothed particle hydrodynamics coupling 审中-公开
标题翻译： Hybridelement zur Kopplung von finiten Elementen undgeglätteterTeilchenhydrodynamik
公开(公告)号：EP2390801A1
公开(公告)日：2011-11-30
申请号：EP11166650.9
申请日：2011-05-19
申请人： Livermore Software Technology Corporation
发明人： Chen, Hao , Xu, Jingxiao , Wang, Chi-Hsien
IPC分类号： G06F17/50
CPC分类号： G06F17/5018 , G06F2217/16
摘要： Hybrid elements (110, 120, 130, 140, 150, 160) that enable coupling effects (510) between SPH particles and FEM solid elements are disclosed. According to one aspect of the present invention, hybrid elements (110, 120, 130, 140, 150, 160) are configured to facilitate coupling effect (510) of solid element based on finite element method, FEM, and one or more corresponding particles based on smoothed particle hydrodynamics, SPH. Hybrid elements (110, 120, 130, 140, 150, 160) are defined in a computer aided engineering grid model (220) as a buffer or interface between the SPH particles and FEM solid elements. For example, a portion of the grid model (220) comprises SPH particles because the likelihood of enduring large deformation, while the rest of the model comprises FEM solid elements. Hybrid elements are placed between the solid elements and the particles. Each hybrid element further comprises two layers: solid layer and particle layer.
摘要翻译：公开了使SPH颗粒和FEM固体元件之间的耦合效应（510）的混合元件（110,120,130,140,150,160）。根据本发明的一个方面，混合元件（110,120,130,140,150,160）被配置为便于基于有限元法，FEM和一个或多个相应颗粒的固体元件的耦合效应（510）基于平滑的粒子流体动力学SPH。在计算机辅助工程网格模型（220）中将混合元件（110,120,130,140,150,160）定义为SPH粒子和FEM固体元件之间的缓冲器或接口。例如，网格模型（220）的一部分包括SPH粒子，因为持续大的变形的可能性，而模型的其余部分包括FEM实体元素。混合元件放置在固体元素和颗粒之间。每个混合元件还包括两层：固体层和颗粒层。

6. 发明公开

EP2357578A1 Multiscale substructures in finite element analysis 审中-公开
标题翻译：有限元分析中的多尺度分析
公开(公告)号：EP2357578A1
公开(公告)日：2011-08-17
申请号：EP10195341.2
申请日：2010-12-16
申请人： Livermore Software Technology Corporation
发明人： Wainscott, Brian , Hallquist, John O.
IPC分类号： G06F17/50
CPC分类号： G06F17/5018
摘要： Methods and systems for conducting a time-marching simulation of a product using a finite element analysis model including at least one multiscale substructure are disclosed. According to one aspect, a FEA model of a product is defined for a time-marching simulation. The FEA model comprises an overall structure, and at least one multiscale substructure. Each substructure corresponds to some of the master representative segments defined in the overall structure. Time-marching simulation of the product is conducted with first and second sets of timescale due to significantly different characteristic dimension of the FEA model. The first set is configured for the overall structure or master group, while the second set for the substructures or slave group. The first set is run at a time step significantly larger than the second set. Synchronization of the responses is at the end of each solution cycle corresponds to the first set of timescale.
摘要翻译：公开了使用包括至少一个多尺度子结构的有限元分析模型进行产品的时间行进模拟的方法和系统。根据一个方面，产品的FEA模型被定义用于时间行进模拟。 FEA模型包括整体结构和至少一个多尺度子结构。每个子结构对应于在整个结构中定义的一些主代表段。由于FEA模型的特征尺寸显着不同，产品的时间模拟由第一和第二组时间尺度进行。第一组配置为整体结构或主组，而第二组为子结构或从组。第一组在比第二组显着大的时间段运行。响应的同步在每个解决周期结束时对应于第一组时间尺度。

7. 发明公开

EP2237175A1 Explosion simulation in finite element analysis 审中-公开
标题翻译：爆炸性有丝分裂有限元分析
公开(公告)号：EP2237175A1
公开(公告)日：2010-10-06
申请号：EP10151946.0
申请日：2010-01-28
申请人： Livermore Software Technology Corporation
发明人： Slavik, Todd Patrick
IPC分类号： G06F17/50 , F42B10/00
CPC分类号： G06F17/5018 , G06F2217/16
摘要： Systems and methods of simulating an explosion in time-marching finite element analysis are disclosed in the present invention. According to one aspect, a method is configured for increasing user (e.g., engineer or scientist) productivity by reducing computation time of simulating fluid-structure interaction due to an explosion. The method comprises a creation of a finite element analysis model that includes structure, surrounding fluid, a blast source of the explosion and a single layer of ambient elements each having a segment representing a boundary of the fluid facing the blast source. Each ambient element is associated with a particular finite element representing the fluid at the boundary. The ambient elements are configured to be situated between the blast source and the structure such that the simulation can be carried on a set of boundary conditions specified thereon. The boundary conditions comprise a set of nodal velocities that are determined from the empirical formula (e.g., Friedlander equation).
摘要翻译：在本发明中公开了在时间有限元分析中模拟爆炸的系统和方法。根据一个方面，一种方法被配置为通过减少由于爆炸而模拟流体 - 结构相互作用的计算时间来增加用户（例如工程师或科学家）的生产率。该方法包括创建有限元分析模型，该模型包括结构，周围流体，爆炸源和单个环境元素层，每个环境元素具有表示面向爆炸源的流体边界的段。每个环境元素与表示边界处流体的特定有限元相关联。环境元件被配置为位于鼓风源和结构之间，使得模拟可以在其上指定的一组边界条件上承载。边界条件包括从经验公式确定的一组节点速度（例如，Friedlander方程式）。

8. 发明公开

EP2196926A2 Solid finite elements suitable for simulating large deformations and/or rotations of a structure 审中-公开
标题翻译： Zur SimulierunggroßerDeformationen und / oder Rotationen einer Struktur geeignete有限元素
公开(公告)号：EP2196926A2
公开(公告)日：2010-06-16
申请号：EP09013299.4
申请日：2009-10-21
申请人： Livermore Software Technology Corporation
发明人： Teng, Hailong , Hallquist, John
IPC分类号： G06F17/50
CPC分类号： G06F17/5018
摘要： System and method of simulating large deformation and rotation of a structure in a finite element analysis used for improving structural design is disclosed. According to one aspect, a special purpose solid finite element is configured for simulating large deformations and/or rotations of a structure. The special purpose solid finite element comprises only corner nodes with each node having six degrees-of-freedom (DOF), three translational and three rotational. In other words, each node is configured to include translational deformation and rotation deformation, each of the translational and rotational deformation has three components corresponding to one of the six DOFs. According to another aspect, the special purpose solid element has a plurality of external edges. Each external edge has two ends, each end is located at one of the adjacent corner nodes. Additionally, translational deformation at mid-edge point of each external edge is implicitly embedded in the translational and rotational deformations of two adjacent corner nodes.
摘要翻译：公开了用于改进结构设计的有限元分析中模拟结构的大变形和旋转的系统和方法。根据一个方面，一种特殊用途的固体有限元被配置用于模拟结构的大变形和/或旋转。专用固体有限元仅包括具有六个自由度（DOF），三个平移和三个旋转的节点的角节点。换句话说，每个节点被配置为包括平移变形和旋转变形，每个平移和旋转变形具有对应于六个自由度之一的三个分量。根据另一方面，专用固体元件具有多个外部边缘。每个外部边缘都有两个端部，每个端部都位于相邻的拐角节点之一。另外，每个外边缘中边缘点的平移变形隐含地嵌入两个相邻角节点的平移和旋转变形。

9. 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.).

10. 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。

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