公开(公告)号：US10467359B2

公开(公告)日：2019-11-05

申请号：US15673655

申请日：2017-08-10

Applicant: Livermore Software Technology Corporation

Inventor： Xinhai Zhu ,  Houfu Fan

IPC: G06F17/50

Abstract: Numerically-simulated physical behaviors of workpiece sheet metal during a metal forming process having a predefined load path is obtained based on received FEA mesh model and mesh adjustment criteria as follows: initializing current simulation time; determining current simulation period from current simulation time and next mesh adjustment time; using characteristic length to establish a 3-D mesh refinement zone that contains a space encompassing a corresponding section of the predefined load path for the current simulation period; updating the FEA mesh model by refining those finite elements located within the 3-D mesh refinement zone to a desired level and by coarsening certain finite elements outside of the zone according to mesh coarsening criterion; conducting corresponding portion of the time-marching simulation using the updated FEA mesh model for current simulation period until current simulation time reaches next mesh adjustment time; and repeating until current simulation time passes the total simulation time period.

公开(公告)号：US10423737B2

公开(公告)日：2019-09-24

申请号：US15651419

申请日：2017-07-17

Applicant: Livermore Software Technology Corporation

Inventor： Boning Zhang

IPC: G06F17/50

Abstract: Numerical simulation method includes receiving a manufacturing process configuration specification for moving various types of arbitrarily-shaped objects from an egress area onto a lower surface with desired mass flow rate in a predefined time period; creating a FEA model representing the lower surface; creating respective bonded discrete element models (BDEMs) representing the various types of the objects, each BDEM containing discrete elements connected by connection bonds; generating a list of BDEMs each with randomly-chosen types and orientation, such that total mass of the list of BDEMs exceeds a target total mass; and obtaining numerically-simulated physical behaviors of the objects in a time-marching simulation. At each solution cycle of the simulation, placing respective objects into randomly-selected ‘open’ sub-regions by activating next relevant portion of the BDEMs based on the mass flow rate and time-step size; releasing activated BDEMs from the egress area onto the lower surface.

公开(公告)号：US10303822B2

公开(公告)日：2019-05-28

申请号：US15475069

申请日：2017-03-30

Applicant: Livermore Software Technology Corporation

Inventor： Xinhai Zhu ,  Li Zhang

IPC: G06F17/50 ,  B21D22/22 ,  B21D37/10

Abstract: Systems and methods of designing geometry of a tool set in a numerical simulation of sheet metal forming operations including springback compensation are disclosed. Computerized die face model representing an initial geometry of a tool set is generated for forming a sheet metal work-piece to a part's desired geometry. Numerically-simulated deep drawing operation, optional trimming operation and a springback effect are conducted to obtained a trial geometry of the part. A deviation between the trial geometry and the desired geometry is obtained. When the deviation is outside of tolerance, computerized die face model is regenerated according to a modified geometry of the tool set that includes an estimated amount of springback compensation derived from the deviation due to springback together with a node adjustment scheme for ensuring model conformity along the boundary line. Final modified geometry of the tool set is iteratively obtained.

公开(公告)号：US09798841B2

公开(公告)日：2017-10-24

申请号：US14854309

申请日：2015-09-15

Applicant: Livermore Software Technology Corporation

Inventor： Hao Chen

IPC: G06F17/50

CPC classification number: G06F17/5018 ,  G06F2217/16

Abstract: Characteristics of a blast source and a FEA model representing a surrounding fluid domain are defined. One layer of new border nodes and elements are created outside of the fluid domain's original outer boundary formed by the original border elements. Each new border element/node is associated with one of the original border elements/nodes as corresponding master element/node. At each time step of a time-marching simulation of an underwater explosion, simulated fluid behaviors are computed for all but the new border elements. The computed fluid behaviors of each original border element are saved into a corresponding lookup table configured to store the computed fluid behaviors for a predefined number of time steps in a first-in-first-out manner. Simulated fluid behaviors of each new border element are determined by interpolating, with the calculated blast wave propagation time from the master element, the stored fluid behaviors in the corresponding master element's lookup table.

公开(公告)号：US08744825B2

公开(公告)日：2014-06-03

申请号：US13371804

申请日：2012-02-13

Applicant: Nicolas Aquelet

Inventor： Nicolas Aquelet

IPC: G06G7/50 ,  G06F7/60 ,  G06F17/10 ,  G06G7/48

CPC classification number: G06G7/50 ,  G06F7/60 ,  G06F17/10 ,  G06F17/5018 ,  G06F2217/16 ,  G06G7/48

Abstract: Systems and methods for refining ALE elements in a time-marching simulation are disclosed. A FEA model representing a physical domain is defined and used in a time-marching simulation that simulates physical phenomena of the physical domain. Certain ones of the ALE elements are refined upon detecting a user-defined triggering condition. Each of said certain ones of the ALE elements is refined into a number of child elements. When an ALE element contains more than one material, volume fractions representing respective materials are calculated in each of the child elements right after each refinement. At each advection phase, each donor maps its flux to one or more receptors. When a donor maps its flux to multiple receptors, each receptor calculates its own share of the flux from the donor. When the donor contains more than one material, each receptor must account for such situation.

Abstract translation: 公开了用于在时间推进模拟中改进ALE元素的系统和方法。 代表物理域的FEA模型在模拟物理域的物理现象的时间模拟中被定义和使用。 在检测到用户定义的触发条件时，ALE元素中的某些被改进。 每个所述某些ALE元素被精炼成许多子元素。 当ALE元素包含多于一种材料时，在每个细化之后的每个子元素中计算代表相应材料的体积分数。 在每个平流阶段，每个供体将其通量映射到一个或多个受体。 当供体将其通量映射到多个受体时，每个受体计算其自身与来自供体的通量的份额。 当供体含有多种材料时，每种受体必须考虑到这种情况。

公开(公告)号：US08666719B2

公开(公告)日：2014-03-04

申请号：US13280506

申请日：2011-10-25

Applicant: Tobias Erhart

Inventor： Tobias Erhart

IPC: G06G7/58

CPC classification number: G06F17/5018

Abstract: 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 bio-mechanical 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”.

Abstract translation: 公开了用于数字模拟沿着骨骼和关节周围的肌肉运动的系统和方法。 使用包含多个桁架元件以及一个或多个辊的计算机化模型。 桁架元件构造成用于对肌肉线进行建模，而每个辊被配置用于关节。 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质模型相关联。 每个辊子固定在相应接头的位置。 为了模拟围绕关节的肌肉束运动，跨越滚子的每对桁架元件在时间行进模拟（例如，汽车和一个或多个乘客的冲击事件的计算机模拟）中被动态调节。 在时间推进模拟的每个解决周期执行调整。 调整包括两种类型 - “滑倒”和“交换”。

公开(公告)号：US20130325423A1

公开(公告)日：2013-12-05

申请号：US13482703

申请日：2012-05-29

Applicant: Xinhai Zhu ,  Li Zhang

Inventor： Xinhai Zhu ,  Li Zhang

IPC: G06G7/48

CPC classification number: G06F17/5018

Abstract: 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. Perform 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. The first set of numerical loads is configured for flattening out the 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.

Abstract translation: 公开了一种在钣金零件的深冲制造中确定修剪线的方法和系统。 定义了钣金件和附件表面几何形状的计算机化模型。 识别计算机化模型中的至少一个凸缘部分。 通过对每对相邻的有限元施加第一组数值载荷来执行法兰朝向齿顶表面展开的数值模拟。 第一组数值载荷被配置为使用一对有限元素的相对取向和部件的材料特性确定的弯曲力矩平坦化一对有限元。 应用第二组数值载荷来封闭展开的法兰和附件之间的剩余间隙。 凸缘部分的最终展开构型的外边缘被指定为修剪线。

公开(公告)号：US08577656B1

公开(公告)日：2013-11-05

申请号：US13237607

申请日：2011-09-20

Applicant: Hailong Teng ,  Chi-Hsien Wang

Inventor： Hailong Teng ,  Chi-Hsien Wang

IPC: G06G7/48

CPC classification number: G06F17/5018

Abstract: Systems and methods for numerically simulating inflation of an airbag configured with more than one connected flexible-boundary volumes (i.e., primary and secondary pouches) are disclosed. A finite element analysis model of such airbag is defined in the airbag's folded configuration. Numerical simulation of inflating the primary pouch is based on corpuscular particle theory by interacting simulated corpuscular or gas particles with one another and with the shell elements representing the primary pouch. The simulated corpuscular particles are created by flow characteristics generated by an explosive blast. Numerical simulation of inflating the secondary pouch is based on control volume theory by converting kinetic energy of those of the simulated corpuscular particles having flowed through the interconnected opening from the primary to the secondary pouch to a uniform pressure. The uniform pressure is then applied onto the shell elements representing the secondary pouch.

Abstract translation: 公开了用于数值模拟构造有多于一个连接的柔性边界体积（即，初级和次级袋）的气囊的膨胀的系统和方法。 这种气囊的有限元分析模型被定义在气囊的折叠结构中。 充气初级袋的数值模拟是基于粒子微粒理论，通过相互作用的模拟粒子或气体颗粒，并且壳体元素代表主要袋。 模拟的粒子是由爆炸产生的流动特征产生的。 充气二次袋的数值模拟是基于控制体积理论，将通过相互连接的开口的模拟颗粒物质的动能从主要的小袋转换成均匀的压力。 然后将均匀的压力施加到表示二次袋的壳单元上。

公开(公告)号：US08489372B2

公开(公告)日：2013-07-16

申请号：US12910632

申请日：2010-10-22

Applicant: Pierre L'Eplattenier

Inventor： Pierre L'Eplattenier

IPC: G06F7/60 ,  G06F17/00 ,  G06G7/48

CPC classification number: G06F7/60 ,  G06F17/10 ,  G06F17/11 ,  G06F17/13 ,  G06F17/50

Abstract: Systems and methods of numerically simulating physical phenomena of firing an electromagnetic rail-gun using a coupled FEM-BEM procedure are disclosed. Electromagnetic rail-gun includes a pair of parallel rails and a projectile located therebetween. Rails and projectile are represented by a FEM model, while the ambient air surrounding the rail-gun is represented by a BEM mesh for simulating the electromagnetic fields. The BEM mesh is generated from the FEM model as a surface encasing the projectile and rails. A sliding contact interface between each of the rails and the projectile causes the BEM faces in contact to be removed and thus resulting into a hole/gap in the BEM mesh. The hole/gap is patched up with new triangular BEM faces without adding new nodes in accordance with a predefined set of rules, such that the resulting BEM mesh is suitable for carrying out the coupled FEM-BEM procedure.

Abstract translation: 公开了使用耦合FEM-BEM程序对电磁轨道枪进行数字模拟物理现象的系统和方法。 电磁轨道枪包括一对平行轨道和位于其间的射弹。 轨道和射弹由FEM模型表示，而围绕轨道枪的环境空气由用于模拟电磁场的BEM网格表示。 BEM网格是从FEM模型生成的，作为包围射弹和轨道的表面。 每个轨道和抛射体之间的滑动接触界面导致接触的BEM面被去除，从而在BEM网格中形成孔/间隙。 孔/间隙用新的三角形BEM面修补，而不会根据预定义的一组规则添加新的节点，使得所得的BEM网格适合于执行耦合的FEM-BEM过程。

公开(公告)号：US07386428B1

公开(公告)日：2008-06-10

申请号：US11025198

申请日：2004-12-29

Applicant: John O. Hallquist ,  Mu Lu

Inventor： John O. Hallquist ,  Mu Lu

IPC: G06F17/50 ,  B25J9/10

CPC classification number: G06F17/5018 ,  G06F2217/36

Abstract: A system, method and software product to simulate guided cable contacts is disclosed. The guided cable contact includes a slave node and an associated beam. A normal vector is established between the slave node's projection point and the slave node. Each of the slave node and two end nodes of the beam has three translational degrees-of-freedom. A spring is placed between the slave node's projection point and the slave node. The spring constant is assigned such that the spring is substantially stiffer than that of the beam. The guided cable contact stiffness matrix is then calculated using the spring constant, the normal vector, the length of the beam, and the distance between the first end node of the beam and the projection point. According to one aspect, the guided cable contact may be used for modeling human spinal column.

Abstract translation: 公开了一种用于模拟导向电缆触点的系统，方法和软件产品。 被引导的电缆触点包括从节点和相关联的光束。 在从节点的投影点和从节点之间建立法向量。 梁的每个从节点和两个端节点具有三个平移自由度。 弹簧位于从节点的投影点和从节点之间。 弹簧常数被赋予使得弹簧基本上比梁的刚度更硬。 然后使用弹簧常数，法向量，梁的长度以及梁的第一端节点与投影点之间的距离来计算引导的电缆接触刚度矩阵。 根据一个方面，所引导的电缆接触可用于建模人脊柱。