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    • 1. 发明授权
    • Algorithm and a method for characterizing surfaces with fractal nature
    • 用于表征分形特征的算法和方法
    • US08884954B2
    • 2014-11-11
    • US13507968
    • 2012-08-10
    • John G. MichopoulosAthanasios Iliopoulos
    • John G. MichopoulosAthanasios Iliopoulos
    • G06T17/00G06T17/05
    • G06T17/05G06F17/10
    • A computer implemented method for directly determining parameters defining a Weierstrass-Mandelbrot (W-M) analytical representation of a rough surface scalar field with fractal character, embedded in a three dimensional space, utilizing pre-existing measured elevation data of a rough surface in the form of a discrete collection of data describing a scalar field at distinct spatial coordinates, is carried out by applying an inverse algorithm to the elevation data to thereby determine the parameters that define the analytical and continuous W-M representation of the rough surface. The invention provides a comprehensive approach for identifying all parameters of the W-M function including the phases and the density of the frequencies that must greater than 1. This enables the infinite-resolution analytical representation of any surface or density array through the W-M fractal function.
    • 一种计算机实现的方法,用于直接确定嵌入在三维空间中的用分形特征的粗糙表面标量场的Weierstrass-Mandelbrot(WM)分析表示的参数,利用预先存在的粗糙表面的测量高程数据以 通过对高程数据应用逆算法来执行描述不同空间坐标的标量场的数据的离散集合,从而确定定义粗糙表面的分析和连续WM表示的参数。 本发明提供了一种用于识别W-M功能的所有参数的综合方法,包括必须大于1的频率的相位和密度。这使得能够通过W-M分形函数对任何表面或密度阵列的无限分辨率分析表示。
    • 5. 发明申请
    • Recursive Hexapod System and Method for Multiaxial Mechanical Testing
    • 递归六足体系和多轴机械测试方法
    • US20130055825A1
    • 2013-03-07
    • US13564794
    • 2012-08-02
    • John G. MichopoulosJohn C. HermansonAthanasios Iliopoulos
    • John G. MichopoulosJohn C. HermansonAthanasios Iliopoulos
    • G01N3/02
    • G01N3/08G01N2203/0042G01N2203/0208G01N2203/0258G01N2203/0617
    • A recursive hexapod testing machine for mechanical testing of deformable material specimens under six degrees of freedom multiaxial loading. The machine includes a fixed base, a movable base connected to the fixed base at by a hexapod arrangement of six linearly extendable actuator linkages, with an end of each linkages attached to the movable base and the other end of the linkage attached to the fixed base. Each actuator linkage includes a hydraulic cylinder and piston, a digitally-controlled electro-hydraulic servo-valve for actuating the hydraulic cylinder in response to a digital command string, a load cell in line between the piston and the universal joint attached to the movable base, a linear variable displacement transducer for measuring extension of the piston, and a magneto-resistive position transducer for measuring a position of the piston. The servo-valves extend each hydraulic cylinder a predetermined amount to effect a desired motion of the material specimen.
    • 一种用于六轴自由度多轴加载下可变形材料试样的机械测试的递归六脚架试验机。 该机器包括一固定底座,一可移动底座,通过六个可直线延伸的致动器联动装置的六脚架构连接到固定底座上,每个连杆的端部连接到可移动底座上,另一端连接到固定底座 。 每个致动器联动装置包括液压缸和活塞,用于响应于数字命令串致动液压缸的数字控制电动液压伺服阀,活塞和连接到可移动底座的万向接头之间的一个称重传感器 ,用于测量活塞延伸的线性可变位移传感器,以及用于测量活塞位置的磁阻位置传感器。 伺服阀将每个液压缸延伸预定量以实现材料试样的期望运动。
    • 6. 发明申请
    • System and Method for Remote Measurement of Displacement and Strain Fields
    • 远程测量位移和应变场的系统和方法
    • US20100310128A1
    • 2010-12-09
    • US12793594
    • 2010-06-03
    • Athanasios IliopoulosJohn G. MichopoulosNikos Andrianopoulos
    • Athanasios IliopoulosJohn G. MichopoulosNikos Andrianopoulos
    • G06K9/62
    • G01B11/165G01M5/005G01M11/081G06T7/246G06T2207/30208
    • A computer-implemented method for measuring full field deformation characteristics of a deformable body. The method includes determining optical setup design parameters for measuring displacement and strain fields, and generating and applying a dot pattern on a planar side of a deformable body. A sequence of images of the dot pattern is acquired before and after deformation of the body. Irregular objects are eliminated from the images based on dot light intensity threshold and the object area or another geometrical cutoff criterion. The characteristic points of the dots are determined, and the characteristic points are matched between two or more of the sequential images. The displacement vector of the characteristic points is found, and mesh free or other techniques are used to estimate the full field displacement based on the displacement vector of the characteristic points. Strain tensor or other displacement-derived quantities can also be estimated using mesh-free or other analysis techniques.
    • 一种用于测量变形体的全场变形特性的计算机实现的方法。 该方法包括确定用于测量位移和应变场的光学设置设计参数,以及在可变形体的平面侧上生成和应用点图案。 在身体变形之前和之后获取点图案的一系列图像。 基于点光强度阈值和对象区域或其他几何截止标准,从图像中消除不规则对象。 确定点的特征点,并且特征点在两个或更多个顺序图像之间匹配。 找到特征点的位移矢量,并且使用无网格或其他技术基于特征点的位移矢量来估计全场位移。 应变张量或其他位移衍生量也可以使用无网格或其他分析技术来估计。
    • 7. 发明授权
    • Recursive hexapod system and method for multiaxial mechanical testing
    • 递归六足系统和多轴机械测试方法
    • US08978480B2
    • 2015-03-17
    • US13564794
    • 2012-08-02
    • John G. MichopoulosJohn C. HermansonAthanasios Iliopoulos
    • John G. MichopoulosJohn C. HermansonAthanasios Iliopoulos
    • G01N3/02G01N3/08
    • G01N3/08G01N2203/0042G01N2203/0208G01N2203/0258G01N2203/0617
    • A recursive hexapod testing machine for mechanical testing of deformable material specimens under six degrees of freedom multiaxial loading. The machine includes a fixed base, a movable base connected to the fixed base at by a hexapod arrangement of six linearly extendable actuator linkages, with an end of each linkages attached to the movable base and the other end of the linkage attached to the fixed base. Each actuator linkage includes a hydraulic cylinder and piston, a digitally-controlled electro-hydraulic servo-valve for actuating the hydraulic cylinder in response to a digital command string, a load cell in line between the piston and the universal joint attached to the movable base, a linear variable displacement transducer for measuring extension of the piston, and a magneto-resistive position transducer for measuring a position of the piston. The servo-valves extend each hydraulic cylinder a predetermined amount to effect a desired motion of the material specimen.
    • 一种用于六轴自由度多轴加载下可变形材料试样的机械测试的递归六脚架试验机。 该机器包括一固定底座,一可移动底座,通过六个可直线延伸的致动器联动装置的六脚架构连接到固定底座上,每个连杆的端部连接到可移动底座上,另一端连接到固定底座 。 每个致动器联动装置包括液压缸和活塞,用于响应于数字命令串致动液压缸的数字控制电动液压伺服阀,活塞和连接到可移动底座的万向接头之间的一个称重传感器 ,用于测量活塞延伸的线性可变位移传感器,以及用于测量活塞位置的磁阻位置传感器。 伺服阀将每个液压缸延伸预定量以实现材料试样的期望运动。