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1. 发明授权

US08756037B2 Curved fiber paths for composite laminates 有权
标题翻译：复合层压板的弯曲纤维路径
公开(公告)号：US08756037B2
公开(公告)日：2014-06-17
申请号：US13164701
申请日：2011-06-20
申请人： Mostafa Rassaian , Matthew Todd Grimshaw , Thomas A. Grandine , Matthew Steven Patterson , Adriana Willempje Blom
发明人： Mostafa Rassaian , Matthew Todd Grimshaw , Thomas A. Grandine , Matthew Steven Patterson , Adriana Willempje Blom
IPC分类号： G06F17/50
CPC分类号： G06F17/50 , G06F17/5018 , G06F17/5095
摘要： A computational optimization process uses the variable stiffness performance of composite laminates attributed to steered fiber to guide the design of stream functions describing the fibers to build it. This design process combines a finite element-based analysis tool, failure criteria and geometry optimization to determine steered angles associated with stream functions by an optimization program to meet target performance requirements, e.g., load condition(s), and failure criteria for quasi-static or dynamic events. The fiber angle distribution and thickness buildup are computed based on the stream function. The simulated structure is analyzed using finite element analysis. The disclosed process allows the designer to impose manufacturing constraints such as fiber steering radius.
摘要翻译：计算优化过程使用归因于转向光纤的复合层压板的可变刚度性能来引导描述纤维的流功能的设计来构建它。该设计过程结合了基于有限元的分析工具，故障标准和几何优化，以通过优化程序确定与流功能相关的转向角度，以满足目标性能要求，例如负载条件和准静态故障标准或动态事件。基于流函数计算光纤角度分布和厚度累积。使用有限元分析对模拟结构进行分析。所公开的过程允许设计者施加诸如纤维转向半径的制造约束。

2. 发明申请

US20120323538A1 Design of Curved Fiber Paths for Composite Laminates 有权
标题翻译：复合层压板弯曲纤维路径设计
公开(公告)号：US20120323538A1
公开(公告)日：2012-12-20
申请号：US13164701
申请日：2011-06-20
申请人： Mostafa Rassaian , Matthew Todd Grimshaw , Thomas A. Grandine , Matthew Steven Patterson
发明人： Mostafa Rassaian , Matthew Todd Grimshaw , Thomas A. Grandine , Matthew Steven Patterson
IPC分类号： G06F17/50 , G06F7/60
CPC分类号： G06F17/50 , G06F17/5018 , G06F17/5095
摘要： A computational optimization process uses the variable stiffness performance of composite laminates attributed to steered fiber to guide the design of stream functions describing the fibers to build it. This design process combines a finite element-based analysis tool, failure criteria and geometry optimization to determine steered angles associated with stream functions by an optimization program to meet target performance requirements, e.g., load condition(s), and failure criteria for quasi-static or dynamic events. The fiber angle distribution and thickness buildup are computed based on the stream function. The simulated structure is analyzed using finite element analysis. The disclosed process allows the designer to impose manufacturing constraints such as fiber steering radius.
摘要翻译：计算优化过程使用归因于转向光纤的复合层压板的可变刚度性能来引导描述纤维的流功能的设计来构建它。该设计过程结合了基于有限元的分析工具，故障标准和几何优化，以通过优化程序确定与流功能相关的转向角度，以满足目标性能要求，例如负载条件和准静态故障标准或动态事件。基于流函数计算光纤角度分布和厚度累积。使用有限元分析对模拟结构进行分析。所公开的过程允许设计者施加诸如纤维转向半径的制造约束。

3. 发明申请

US20080104553A1 METHOD AND APPARATUS FOR INTEGRATED HIERARCHICAL ELECTRONICS ANALYSIS 有权
标题翻译：综合分层电子分析方法与装置
公开(公告)号：US20080104553A1
公开(公告)日：2008-05-01
申请号：US11549819
申请日：2006-10-16
申请人： Mostafa Rassaian , David W. Twigg , Jung-Chuan Lee
发明人： Mostafa Rassaian , David W. Twigg , Jung-Chuan Lee
IPC分类号： G06F17/50
CPC分类号： G06F17/50 , G06F17/5018 , G06F17/5095 , G06F2217/80 , H05K3/341
摘要： A computer implemented method, apparatus, and computer usable program code for analyzing durability of electronic components. A finite element model for the chassis is created. A set of finite element models for a set of printed wiring assemblies are created, wherein the printed wiring assemblies are for use with chassis and include the electronic components. The finite element model for the chassis is combined with the set of finite element models to form a combined finite element model. A finite element analysis of the combined finite element model is performed to form results. The combined model results are transferred to the printed wiring board models. Using the transferred results, stresses and strains are calculated for individual solder joints/leads. A fatigue analysis is performed for the electronic components in the set of printed wiring assemblies based on these stresses and strains, using the results to identify the durability of the electronic components.
摘要翻译：一种用于分析电子部件的耐久性的计算机实现的方法，装置和计算机可用程序代码。创建了底盘的有限元模型。创建了一组用于一组印刷线路组件的有限元模型，其中印刷线路组件用于底盘并且包括电子部件。底盘的有限元模型与有限元模型组合形成一个组合有限元模型。进行组合有限元模型的有限元分析，形成结果。组合的模型结果转移到印刷线路板型号。使用转移的结果，计算各个焊点/引线的应力和应变。基于这些应力和应变，对印刷布线组件中的电子部件进行疲劳分析，结果确定电子部件的耐久性。

4. 发明申请

US20070069079A1 Optimal aircraft window shape for noise control 有权
标题翻译：最佳飞机窗口形状用于噪声控制
公开(公告)号：US20070069079A1
公开(公告)日：2007-03-29
申请号：US11223297
申请日：2005-09-09
申请人： Mostafa Rassaian , Jung-Chuan Lee , Josh Montgomery , Peter Guard , Mark Stadum , Paul Mikulencak , Richard Brigman
发明人： Mostafa Rassaian , Jung-Chuan Lee , Josh Montgomery , Peter Guard , Mark Stadum , Paul Mikulencak , Richard Brigman
IPC分类号： B64C1/14
CPC分类号： B64C1/1484
摘要： A window for a subsonic passenger aircraft that provide maximum optical visibility while minimizing the amount of exterior acoustic noise transmitted through the windows to the passenger cabin during flight of the aircraft includes at least one substantially transparent window pane having the shape of an ellipse. The ellipse has a major axis and a minor axis, and the major axis is about twice as long as the minor axis and is disposed generally perpendicular to the direction of flight of the aircraft. In one exemplary embodiment, the window has a height of about 20 inches and a transparent area of about 141 square inches, and includes a pair of substantially similar window panes disposed in a parallel, spaced-apart relationship circumscribed by a mounting bezel. A plurality of the windows are each mounted with the bezels in spaced-apart rows in each of the opposite sidewalls of the aircraft fuselage.
摘要翻译：一种亚音速客机的窗口，其提供最大的光学可视性，同时使在飞机飞行期间通过窗户传输到客舱的外部声学噪声的数量最小化包括至少一个具有椭圆形状的基本上透明的窗格。椭圆具有长轴和短轴，并且长轴为短轴的大约两倍，并且大致垂直于飞行器的飞行方向设置。在一个示例性实施例中，窗口具有约20英寸的高度和约141平方英寸的透明面积，并且包括一对基本相似的窗玻璃，其以由安装表圈限定的平行，间隔的关系设置。在飞行器机身的每个相对侧壁中的每一个中，多个窗口分别安装有间隔开的行。

5. 发明授权

US09665976B2 Reducing finite element simulation time by reducing cross-correlation terms 有权
公开(公告)号：US09665976B2
公开(公告)日：2017-05-30
申请号：US12137389
申请日：2008-06-11
申请人： Mostafa Rassaian , Thomas T. Arakawa , Jeffery S. Knowlton
发明人： Mostafa Rassaian , Thomas T. Arakawa , Jeffery S. Knowlton
IPC分类号： G06F7/60 , G06F17/10 , G06T17/20 , G06F17/50
CPC分类号： G06T17/20 , G06F17/5018
摘要： Methods and systems for reducing finite element simulation time for acoustic response analysis are disclosed. In one embodiment, a method includes analytically creating a finite element model, the finite element model including a plurality of subdivisions. A plurality of cross-correlations between respective pairings of the subdivisions is then specified. A portion of the cross-correlations are then eliminated to provide a reduced set of cross-correlations between respective pairings of the subdivisions. The elimination includes determining a spatial distance value between at least two subdivisions, and discarding at least one of the cross-correlations for which the spatial distance value is greater than a specified threshold value. The finite element simulation is then performed using the reduced set of cross-correlations.

6. 发明申请

US20130220521A1 AUTOMATED FIBER PLACEMENT INCLUDING LAYUP MANDREL TOOL 有权
标题翻译：自动光纤放置，包括LAYUP MANDREL工具
公开(公告)号：US20130220521A1
公开(公告)日：2013-08-29
申请号：US13406522
申请日：2012-02-27
申请人： Simon D. Senibi , Mostafa Rassaian , Richard N. Huizenga , Gilbert L. Lewis , Jeffery L. Waugh , Leo E. Dondlinger
发明人： Simon D. Senibi , Mostafa Rassaian , Richard N. Huizenga , Gilbert L. Lewis , Jeffery L. Waugh , Leo E. Dondlinger
IPC分类号： B65H81/02
CPC分类号： B29C70/32 , B29C33/485 , B29C70/382 , B29L2031/3082 , Y02T50/43
摘要： A system comprises an automated fiber placement (AFP) machine and a layup mandrel tool supported by the AFP machine. The mandrel tool includes a truss core and a plurality of mandrel panels attached to the truss core to form a layup surface.
摘要翻译：一种系统包括自动光纤放置（AFP）机器和由AFP机器支撑的叠层心轴工具。心轴工具包括桁架芯和连接到桁架芯的多个心轴板，以形成叠层表面。

7. 发明授权

US07623994B2 Object oriented acoustic modeling tools and methods 有权
标题翻译：面向对象的声学建模工具和方法
公开(公告)号：US07623994B2
公开(公告)日：2009-11-24
申请号：US10898235
申请日：2004-07-26
申请人： Mostafa Rassaian , David W. Twigg
发明人： Mostafa Rassaian , David W. Twigg
IPC分类号： G06F7/60 , G06F17/10
CPC分类号： G10L25/48 , G06F17/5018 , G06T17/20 , G10L25/03
摘要： Techniques for creating an acoustic model from a finite element mode include strategically partitioning elements of the finite element model into sets, forming composite centroids from the partitioned elements and then calculating the spatial distances between the composite centroids so that an acoustic model can be created using a tiny portion of the computational power otherwise required. By further constraining the composite model to conform to an M-by-N array, object-oriented code can be used.
摘要翻译：用于从有限元模式创建声学模型的技术包括将有限元模型的元素策略性地划分成组，从分割元素形成复合质心，然后计算复合质心之间的空间距离，使得可以使用否则需要计算能力的微小部分。通过进一步约束复合模型以符合M-by-N阵列，可以使用面向对象的代码。

8. 发明授权

US07558639B2 Method and apparatus for integrated hierarchical electronics analysis 有权
标题翻译：集成分层电子分析的方法和装置
公开(公告)号：US07558639B2
公开(公告)日：2009-07-07
申请号：US11549819
申请日：2006-10-16
申请人： Mostafa Rassaian , David W. Twigg , Jung-Chuan Lee
发明人： Mostafa Rassaian , David W. Twigg , Jung-Chuan Lee
IPC分类号： G06F17/50 , G06F19/00
CPC分类号： G06F17/50 , G06F17/5018 , G06F17/5095 , G06F2217/80 , H05K3/341
摘要： A computer implemented method, apparatus, and computer usable program code for analyzing durability of electronic components. A finite element model for the chassis is created. A set of finite element models for a set of printed wiring assemblies are created, wherein the printed wiring assemblies are for use with chassis and include the electronic components. The finite element model for the chassis is combined with the set of finite element models to form a combined finite element model. A finite element analysis of the combined finite element model is performed to form results. The combined model results are transferred to the printed wiring board models. Using the transferred results, stresses and strains are calculated for individual solder joints/leads. A fatigue analysis is performed for the electronic components in the set of printed wiring assemblies based on these stresses and strains, using the results to identify the durability of the electronic components.
摘要翻译：一种用于分析电子部件的耐久性的计算机实现的方法，装置和计算机可用程序代码。创建了底盘的有限元模型。创建了一组用于一组印刷线路组件的有限元模型，其中印刷线路组件用于底盘并且包括电子部件。底盘的有限元模型与有限元模型组合形成一个组合有限元模型。进行组合有限元模型的有限元分析，形成结果。组合的模型结果转移到印刷线路板型号。使用转移的结果，计算各个焊点/引线的应力和应变。基于这些应力和应变，对印刷布线组件中的电子部件进行疲劳分析，结果确定电子部件的耐久性。

9. 发明申请

US20060217943A1 Methods and systems for reducing finite element simulation time for acoustic response analysis 有权
标题翻译：用于声学响应分析的减少有限元模拟时间的方法和系统
公开(公告)号：US20060217943A1
公开(公告)日：2006-09-28
申请号：US11089182
申请日：2005-03-23
申请人： Mostafa Rassaian , Thomas Arakawa , Jeffrey Knowlton
发明人： Mostafa Rassaian , Thomas Arakawa , Jeffrey Knowlton
IPC分类号： G06F17/10
CPC分类号： G06T17/20 , G06F17/5018
摘要： Methods and systems for reducing finite element simulation time for acoustic response analysis are disclosed. In one embodiment, a method includes analytically creating a finite element model, the finite element model including a plurality of subdivisions. A plurality of cross-correlations between respective pairings of the subdivisions is then specified. A portion of the cross-correlations are then eliminated to provide a reduced set of cross-correlations between respective pairings of the subdivisions. The elimination includes determining a spatial distance value between at least two subdivisions, and discarding at least one of the cross-correlations for which the spatial distance value is greater than a specified threshold value. The finite element simulation is then performed using the reduced set of cross-correlations.
摘要翻译：公开了用于降低声响应分析的有限元模拟时间的方法和系统。在一个实施例中，一种方法包括分析地创建有限元模型，所述有限元模型包括多个细分。然后指定子部分的各个配对之间的多个互相关。然后消除一部分交叉相关，以便在分组的相应配对之间提供一组减少的互相关。消除包括确定至少两个细分之间的空间距离值，并且丢弃空间距离值大于指定阈值的交叉相关性中的至少一个。然后使用减少的交叉相关集来执行有限元模拟。

10. 发明授权

US06363789B1 Acoustic pressure load conversion method to vibration spectra 有权
标题翻译：声压负荷转换法振动谱
公开(公告)号：US06363789B1
公开(公告)日：2002-04-02
申请号：US09584646
申请日：2000-05-31
申请人： Mostafa Rassaian , Jung-Chaun Lee , Gerould K. Young , Alan Edqar Landmann
发明人： Mostafa Rassaian , Jung-Chaun Lee , Gerould K. Young , Alan Edqar Landmann
IPC分类号： G06F1750
CPC分类号： G01M7/00 , G01N2203/0073
摘要： A method is provided for testing structural-acoustic systems using a shaker table. The method includes subjecting a panel structure design to a computational acoustic load and a computational vibration load. The method then computes the ratio of the panel structure maximum response to the acoustic load to the panel structure maximum response to the vibration load. The ratio of these two maximum responses provides a conversion factor for linking an acoustic environment to a vibration environment. Using the conversion factor, the method converts a sonic pressure load for the panel structure to a vibration load. The vibration load is then applied to a panel structure using a shaker table.
摘要翻译：提供了一种使用振动台测试结构声学系统的方法。该方法包括对面板结构设计进行计算声学载荷和计算振动载荷。该方法然后计算面板结构最大响应与声学负载与面板结构对振动载荷的最大响应的比率。这两个最大响应的比率提供了将声学环境连接到振动环境的转换因子。使用转换因子，该方法将面板结构的声压负载转换为振动载荷。然后使用振动台将振动载荷施加到面板结构。

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