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21. 发明公开

EP2323052A1 Creation of simulated rigid bodies in a finite element analysis 审中-公开
标题翻译： Erzeugung simulierter starrerKörper在einer有限元素分析
公开(公告)号：EP2323052A1
公开(公告)日：2011-05-18
申请号：EP10186506.1
申请日：2010-10-05
申请人： Livermore Software Technology Corporation
发明人： Hallquist, John O. , Wainscott, Brian
IPC分类号： G06F17/50
CPC分类号： G06F17/5018
摘要： Improved methods and systems for defining and creating simulated rigid bodies in finite element analysis are disclosed. One or more rigid finite elements in a finite element model arc designated for forming one or more simulated rigid bodies (RBs). Each simulated RB comprises an arbitrary number of rigid finite elements connecting to one another in an arbitrary shape. Each simulated RB is created by locating all of the elements embedded in the model through shared node or nodes. A procedure of using element definition as a guide to set up an array of node flags, each node flag for one node such that all RBs defined in the model can be located efficiently. Once all RBs have been located, each unique RB is defined as a unique list of connected rigid finite elements.
摘要翻译：公开了用于在有限元分析中定义和创建模拟刚体的改进的方法和系统。有限元模型中的一个或多个刚性有限元被指定用于形成一个或多个模拟刚体（RB）。每个模拟RB包括任意数量的以任意形状彼此连接的刚性有限元。通过共享节点或节点定位模型中嵌入的所有元素来创建每个模拟RB。使用元素定义作为建立节点标志数组的指南的过程，每个节点标志用于一个节点，使得模型中定义的所有RB可以被有效地定位。一旦所有的RB都被定位，每个独特的RB被定义为连接的刚性有限元的唯一列表。

22. 发明公开

EP2306373A1 Methods and systems for multi-objective evolutionary algorithm based engineering design optimization 审中-公开
标题翻译：方法和系统基础上，Baugestaltungsoptimierung与多个目的地进化算法
公开(公告)号：EP2306373A1
公开(公告)日：2011-04-06
申请号：EP10172879.8
申请日：2010-08-16
申请人： Livermore Software Technology Corporation
发明人： Goel, Tushar
IPC分类号： G06N3/12
CPC分类号： G06N3/126 , G06F17/5009 , G06F2217/08
摘要： The present invention discloses systems and methods of conducting multi-objective evolutionary algorithm (MOEA) based engineering design optimization of a product (e.g., automobile, cellular phone, etc.). Particularly, the present invention discloses an archive configured for monitoring the progress and characterizing the performance of the MOEA based optimization. Further, an optimization performance indicator is created using the archive's update history. The optimization performance indicator is used as a metric of the current state of the optimization. Finally, a stopping or termination criterion for the MOEA based optimization is determined using a measurement derived from the optimization performance indicators. For example, a confirmation of a "knee" formation has developed in the optimization performance indicators. The optimization performance indicators include, but are not limited to, consolidation ratio, improvement ratio, hypervolume.
摘要翻译：本发明的盘系统少并进行产品的多目标进化算法（MOEA）的工程设计优化（例如，汽车，蜂窝电话等）的方法。具体地，本发明盘松动配置用于监测进展和表征基于MOEA优化的性能的档案。此外，在优化性能指示器使用档案的更新历史创造。所述优化性能指示器被用作优化的当前状态的一个度量。最后，对于基于MOEA优化的停止或者终止标准确定性使用从优化性能指标推导出的测量开采。例如，一个“拐点”形态的确认在优化性能指标已经发展。优化性能指标包括，但不限于，固结比，改进比，超体积。

23. 发明公开

EP2249267A2 Neighborhood determination methods and systems in computer aided engineering analysis 审中-公开
标题翻译：在einer计算机技术分析中的Verfahren und Systeme zur Nachbarschaftsbestimmung
公开(公告)号：EP2249267A2
公开(公告)日：2010-11-10
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.
摘要翻译：公开了用于计算机辅助工程分析中邻域确定的改进方法和系统。根据一个方面，为表示结构或工程产品的网格模型的基座创建相邻元素的列表。使用基本元素的角节点计算基本元素的代表性节点的坐标。特征长度被分配给基本元素。特征长度可以由计算机辅助分析的用户确定，或者使用基本元素的几何结构来计算。特征长度和代表性节点共同定义了将网格模型中的元素分为两组的表面边界。第一组包含潜在的邻居，而第二组包含非邻居。仅使用传统程序进一步处理第一组中的元素，以根据邻域确定标准之一来确定它们中的每一个确实是相邻元素。

24. 发明公开

EP2219124A2 Thermal fluid-structure interaction simulation in finite element analysis 有权
标题翻译：使用有限元分析热流体结构相互作用的数值模拟
公开(公告)号：EP2219124A2
公开(公告)日：2010-08-18
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
摘要： Simulation of thermal fluid-structure interaction using bulk flow fluid elements (BFFEs) is described. Each BFFE is configured to include the following characteristics: 1) at least one surrounding layer of solid elements representing either the surrounding structure or the pipe wall; 2) a layer of shell elements or Bulk Node Segments representing the outer boundary of the fluid; 3) a Bulk Node at the center of the BFFE for defining fluid properties (e.g., density, specific heat) and volume (i.e., fluid volume is calculated as the enclosed volume between the Bulk Node and all of the Bulk Node Segments that surround it); 4) a fluid flow beam element or Bulk Node Element for defining fluid flow path to another BFFE; and 5) a contact interface between the solid elements and the shell elements for conducting fluid-structure thermal interaction.

25. 发明公开

EP2180416A2 Improved method of initializing bolt pretension in a finite element analysis 有权
标题翻译： Verbittenes Verfahren zur Initialisierung der Bolzenvorspannung in einer有限元素分析
公开(公告)号：EP2180416A2
公开(公告)日：2010-04-28
申请号：EP09008628.1
申请日：2009-07-01
申请人： Livermore Software Technology Corporation
发明人： Hallquist John Q.
IPC分类号： G06F17/50
CPC分类号： G06F17/5018
摘要： In one aspect of the invention, each bolt is modeled using a beam element in a FEA model. To apply desired pretension to one or more bolts, at least one pretension-versus-time curve is specified. Each pretension-versus-time curve includes ramp portion, desired pretension portion and optional unloading portion. Duration of the pretension-versus-time curve generally covers first 0.5-1% of total simulation time of a car crashworthiness analysis. Ramp portion starts from zero to desired pretension in a substantially linear manner, and hence being configured for applying desired pretension to a bolt gradually with smaller increments. Desired pretension portion is configured for ensuring the desired pretension can actually be applied to the beam element during an initialization process - a series of quasi-static analyses. Since the method is independent of the deformation of the beam, the method completely avoids the need to iteratively determine an axial strain or displacement that gives the desired pretension.
摘要翻译：在本发明的一个方面，使用FEA模型中的梁元件对每个螺栓进行建模。为了将所需的预张力施加到一个或多个螺栓上，指定至少一个预张力对时间曲线。每个预张力对时间曲线包括斜坡部分，期望的预紧部分和可选的卸载部分。预紧力与时间曲线的持续时间通常覆盖汽车碰撞分析总模拟时间的0.5-1％。斜坡部分从零开始到基本上线性的所需的预紧力，因此构造成以较小的增量逐渐地对螺栓施加期望的预紧力。预期的预紧部分被配置为确保在初始化过程中实际上可以将所需的预紧力施加到梁元件 - 一系列准静态分析。由于该方法与梁的变形无关，所以该方法完全避免了迭代确定给出所需预张力的轴向应变或位移的需要。

26. 发明公开

EP2393027A3 Curve matching for parameter identification 审中-公开
标题翻译：用于参数识别的曲线匹配
公开(公告)号：EP2393027A3
公开(公告)日：2017-06-28
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）进行匹配以实现逼真的工程模拟的方法和系统。通过调整模拟模型的参数输入来实现参数识别的优化，使得两条曲线（302,304）之间的差异最小化。因为要匹配的两条曲线（302,304）上的点（312,316）是成对的，所以可以处理任何两条开放曲线（包括滞后曲线）的匹配。在原始坐标中完全分开的曲线可以合并到通用坐标系中进行参数识别，而不会出现计算不稳定问题。部分匹配方案（410g）用于将定义两条曲线（302,304）中较短的一条的点（312）映射到较长的一条上的一组映射点（316）。来自较长曲线（304）的第一点的一个或多个偏移（320）被用于多次尝试（401g）以找到最佳拟合。

27. 发明公开

EP2587392A3 Methods and systems for numerically simulating muscle movements along bones and around joints 审中-公开
标题翻译：用于数值模拟沿着骨骼和关节周围的肌肉运动的方法和系统
公开(公告)号：EP2587392A3
公开(公告)日：2017-06-07
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：披露了用于数值模拟肌肉沿骨骼和关节周围运动的系统和方法。使用包含多个桁架元件以及一个或多个滚轮的计算机化模型。桁架元件被配置用于在每个滚筒被配置用于关节时为肌肉股线建模。每个桁架元件包括两个末端节点并且被配置或与肌肉生物力学属性模型相关联。每个滚筒固定在相应接头的位置。为了模拟关节周围的肌肉股线运动，在时间推进模拟（例如，汽车和一个或多个乘员的碰撞事件的计算机模拟）中动态调整跨骑在滚轮上的每对桁架元件。调整是在时间推进模拟的每个解决方案周期执行的。调整包括两种类型 - “滑动”和“交换”。

28. 发明公开

EP2196926A3 Solid finite elements suitable for simulating large deformations and/or rotations of a structure 审中-公开
标题翻译：用于模拟结构合适的有限元的大变形和/或旋转
公开(公告)号：EP2196926A3
公开(公告)日：2014-04-16
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.

29. 发明公开

EP2219124A3 Thermal fluid-structure interaction simulation in finite element analysis 有权
标题翻译：使用有限元分析热流体结构相互作用的数值模拟
公开(公告)号：EP2219124A3
公开(公告)日：2014-03-05
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
摘要： Simulation of thermal fluid-structure interaction using bulk flow fluid elements (BFFEs) is described. Each BFFE is configured to include the following characteristics: 1) at least one surrounding layer of solid elements representing either the surrounding structure or the pipe wall; 2) a layer of shell elements or Bulk Node Segments representing the outer boundary of the fluid; 3) a Bulk Node at the center of the BFFE for defining fluid properties (e.g., density, specific heat) and volume (i.e., fluid volume is calculated as the enclosed volume between the Bulk Node and all of the Bulk Node Segments that surround it); 4) a fluid flow beam element or Bulk Node Element for defining fluid flow path to another BFFE; and 5) a contact interface between the solid elements and the shell elements for conducting fluid-structure thermal interaction.

30. 发明公开

EP2393026A2 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：EP2393026A2
公开(公告)日：2011-12-07
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.).
摘要翻译：的方法和系统用于模拟声场由被盘游离缺失的结构进行振动 - 声学分析导致从特殊激励。。根据本发明的一个方面，一种结构的声振分析在两个阶段中进行。首先，稳态动态（SSD）的反应使用的是结构受到谐波激励（例如，外部节点载荷，压力，或执行动作（例如，地面运动）等）的有限元分析模型得到。稳态响应是结果（例如，在该结构的所希望的位置的节点速度）在频域中的有限元分析获得。第二，声学分析利用在作为边界条件在结构上的所需位置获得的节点速度被引导到gemäßHelmholtz方程。声学分析可以在多个程序（E. G.，边界元法，瑞利近似方法等）来进行。

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