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Inverse problem of elastica of a variable-arc-length beam subjected to a concentrated load 被引量:5
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作者 Xiaowei Zhang Jialing Yang 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2005年第5期444-450,共7页
An inverse problem of elastica of a variable-arclength beam subjected to a concentrated load is investigated. The beam is fixed at one end, and can slide freely over a hinge support at the other end. The inverse probl... An inverse problem of elastica of a variable-arclength beam subjected to a concentrated load is investigated. The beam is fixed at one end, and can slide freely over a hinge support at the other end. The inverse problem is to determine the value of the load when the deflection of the action point of the load is given. Based on the elasitca equations and the elliptic integrals, a set of nonlinear equations for the inverse problem are derived, and an analytical solution by means of iterations and Quasi-Newton method is presented. From the results, the relationship between the loads and deflections of the loading point is obtained. 展开更多
关键词 Inverse problem. elastica. Variable-arc-length beam-. Quasi-Newton method
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颅骨点云曲面重建的Euler’s Elastica模型
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作者 牛慧勤 潘振宽 +1 位作者 赵俊莉 周明全 《计算机辅助设计与图形学学报》 EI CSCD 北大核心 2022年第10期1515-1523,共9页
为从具有复杂拓扑关系的颅骨点云数据中重建精确、光滑的隐式曲面,提出了基于Euler’s Elastica的变分水平集方法.首先,将Euler’s Elastica作为正则化约束引入变分能量泛函,采用增广拉格朗日方法将变分能量泛函最小化问题转化为一系列... 为从具有复杂拓扑关系的颅骨点云数据中重建精确、光滑的隐式曲面,提出了基于Euler’s Elastica的变分水平集方法.首先,将Euler’s Elastica作为正则化约束引入变分能量泛函,采用增广拉格朗日方法将变分能量泛函最小化问题转化为一系列子问题;其次,分别采用广义软阈值公式、解析公式和快速傅里叶变换求解;最后,在计算过程中采用投影算法,有效地避免了水平集函数的重新初始化过程.实验结果表明,相较于现有方法,所提基于Euler’s Elastica的变分水平集方法具有更好的收敛性和有效性,能够提高重建的精确性,避免曲面边缘的缺失. 展开更多
关键词 曲面重建 水平集方法 Euler’s elastica 增广拉格朗日方法
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Bending of a Tapered Rod: Modern Application and Experimental Test of Elastica Theory 被引量:2
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作者 M. P. Silverman Joseph Farrah 《World Journal of Mechanics》 2018年第7期272-300,共29页
A tapered rod mounted at one end (base) and subject to a normal force at the other end (tip) is a fundamental structure of continuum mechanics that occurs widely at all size scales from radio towers to fishing rods to... A tapered rod mounted at one end (base) and subject to a normal force at the other end (tip) is a fundamental structure of continuum mechanics that occurs widely at all size scales from radio towers to fishing rods to micro-electromechanical sensors. Although the bending of a uniform rod is well studied and gives rise to mathematical shapes described by elliptic integrals, no exact closed form solution to the nonlinear differential equations of static equilibrium is known for the deflection of a tapered rod. We report in this paper a comprehensive numerical analysis and experimental test of the exact theory of bending deformation of a tapered rod. Given the rod geometry and elastic modulus, the theory yields virtually all the geometric and physical features that an analyst, experimenter, or instrument designer might want as a function of impressed load, such as the exact curve of deformation (termed the elastica), maximum tip displacement, maximum tip deflection angle, distribution of curvature, and distribution of bending moment. Applied experimentally, the theory permits rapid estimation of the elastic modulus of a rod, which is not easily obtainable by other means. We have tested the theory by photographing the shapes of a set of flexible rods of different lengths and tapers subject to a range of impressed loads and using digital image analysis to extract the coordinates of the elastica curves. The extent of flexure in these experiments far exceeded the range of applicability of approximations that linearize the equations of equilibrium or neglect tapering of the rod. Agreement between the measured deflection curves and the exact theoretical predictions was excellent in all but several cases. In these exceptional cases, the nature of the anomalies provided important information regarding the deviation of the rods from an ideal Euler-Bernoulli cantilever, which thereby permitted us to model the deformation of the rods more accurately. 展开更多
关键词 elastica DEFLECTION of Tapered CANTILEVER Euler-Bernoulli Beam Elastic MODULUS Flexure FORMULA
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Generalized Elastica in Anti-de Sitter Space H_1~3
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作者 HUANG Rong-pei LIAO Cai-sheng SHANG Dong-hu 《Chinese Quarterly Journal of Mathematics》 CSCD 2011年第2期311-316,共6页
In this paper,the extremals of curvature energy actions on non-null Frenet curves in 3-dimensional Anti-de Sitter space are studied.We completely solve the Euler-Lagrange equation by quadratures.By using the Killing f... In this paper,the extremals of curvature energy actions on non-null Frenet curves in 3-dimensional Anti-de Sitter space are studied.We completely solve the Euler-Lagrange equation by quadratures.By using the Killing fields,we obtain existence for closed general-ized elastica fully immersed in Anti-de Sitter space H_1~3. 展开更多
关键词 generalized elastica Killing field Anti-de Sitter space
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柔壁风洞设计中的Elastica反问题 被引量:2
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作者 张晓伟 杨嘉陵 《航空学报》 EI CAS CSCD 北大核心 2005年第6期696-700,共5页
提出了计算柔壁风洞设计中大挠度反问题的分段线性化方法。将风洞的柔性壁简化为一端固支、一端可自由滑动的梁,其受到气压分布力、自重以及作动筒集中力的作用,需要通过离散分布的作动筒控制柔壁形状。柔壁在多种马赫数条件下的形状和... 提出了计算柔壁风洞设计中大挠度反问题的分段线性化方法。将风洞的柔性壁简化为一端固支、一端可自由滑动的梁,其受到气压分布力、自重以及作动筒集中力的作用,需要通过离散分布的作动筒控制柔壁形状。柔壁在多种马赫数条件下的形状和气压沿长度方向变化规律已知,而要求解所需作动筒集中力的大小。通过对简单梁理论的修正,提出了分段线性化方法计算方法,得到了梁的变形方程组,并求得问题的近似解。然后采用非线性迭代方法得到在近似解作用下变形曲线,与气动设计曲线进行比较。 展开更多
关键词 柔壁风洞 弹性大挠度 反问题 分段线性化
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A Fast Augmented Lagrangian Method for Euler’s Elastica Models 被引量:2
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作者 Yuping Duan Yu Wang Jooyoung Hahn 《Numerical Mathematics(Theory,Methods and Applications)》 SCIE 2013年第1期47-71,共25页
In this paper,a fast algorithm for Euler’s elastica functional is proposed,in which the Euler’s elastica functional is reformulated as a constrained minimization problem.Combining the augmented Lagrangian method and... In this paper,a fast algorithm for Euler’s elastica functional is proposed,in which the Euler’s elastica functional is reformulated as a constrained minimization problem.Combining the augmented Lagrangian method and operator splitting techniques,the resulting saddle-point problem is solved by a serial of subproblems.To tackle the nonlinear constraints arising in the model,a novel fixed-point-based approach is proposed so that all the subproblems either is a linear problem or has a closed-form solution.We show the good performance of our approach in terms of speed and reliability using numerous numerical examples on synthetic,real-world and medical images for image denoising,image inpainting and image zooming problems. 展开更多
关键词 Euler’s elastica augmented Lagrangian method image denoising image inpainting image zooming
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Snap-through of an elastica under bilateral displacement control at a material point 被引量:1
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作者 Q.Wang H.L.Zou Z.C.Deng 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2020年第3期727-734,共8页
Snap-through phenomenon widely occurs for elastic systems,where the systems lose stability at critical points.Here snapthrough of an elastica under bilateral displacement control at a material point is studied,by rega... Snap-through phenomenon widely occurs for elastic systems,where the systems lose stability at critical points.Here snapthrough of an elastica under bilateral displacement control at a material point is studied,by regarding the whole elastica as two components,i.e.,pinned-clamped elasticas.Specifically,stiffness-curvature curves of two pinned-clamped elasticas are firstly efficiently located based on the second-order mode,which are used to determine the shapes of two components.Similar transformations are used to assemble two components together to form the whole elastica,which reveals four kinds of shapes.One advantage of this way compared with other methods such as the shooting method is that multiple coexisting solutions can be located accurately.O n the load-deflection curves,four branches correspond to four kinds of shapes and first two branches are symmetrical to the last two branches relative to the original point.For the bilateral displacement control,the critical points can only appear at saddle-node bifurcations,which is different to that for the unilateral displacement control.Specifically,one critical point is found on the first branch and two critical points are found on the secondary branch.In addition,the snap-through among different branches can be well explained with these critical points. 展开更多
关键词 elastica SNAP-THROUGH Critical points BUCKLING Displacement control
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Fast Linearized Augmented Lagrangian Method for Euler’s Elastica Model 被引量:1
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作者 Jun Zhang Rongliang Chen +1 位作者 Chengzhi Deng Shengqian Wang 《Numerical Mathematics(Theory,Methods and Applications)》 SCIE CSCD 2017年第1期98-115,共18页
Recently,many variational models involving high order derivatives have been widely used in image processing,because they can reduce staircase effects during noise elimination.However,it is very challenging to construc... Recently,many variational models involving high order derivatives have been widely used in image processing,because they can reduce staircase effects during noise elimination.However,it is very challenging to construct efficient algo-rithms to obtain the minimizers of original high order functionals.In this paper,we propose a new linearized augmented Lagrangian method for Euler’s elastica image denoising model.We detail the procedures of finding the saddle-points of the aug-mented Lagrangian functional.Instead of solving associated linear systems by FFTor linear iterative methods(e.g.,the Gauss-Seidel method),we adopt a linearized strat-egy to get an iteration sequence so as to reduce computational cost.In addition,we give some simple complexity analysis for the proposed method.Experimental results with comparison to the previous method are supplied to demonstrate the efficiency of the proposed method,and indicate that such a linearized augmented Lagrangian method is more suitable to deal with large-sized images. 展开更多
关键词 Image denoising Euler’s elastica model linearized augmented Lagrangian method shrink operator closed form solution
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Segmentation by Elastica Energy with L^(1) and L^(2) Curvatures: a Performance Comparison
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作者 Xuan He Wei Zhu Xue-Cheng Tai 《Numerical Mathematics(Theory,Methods and Applications)》 SCIE CSCD 2019年第1期285-311,共27页
In this paper,we propose an algorithm based on augmented Lagrangian method and give a performance comparison for two segmentation models that use the L^(1)-and L^(2)-Euler’s elastica energy respectively as the regula... In this paper,we propose an algorithm based on augmented Lagrangian method and give a performance comparison for two segmentation models that use the L^(1)-and L^(2)-Euler’s elastica energy respectively as the regularization for image seg-mentation.To capture contour curvature more reliably,we develop novel augmented Lagrangian functionals that ensure the segmentation level set function to be signed dis-tance functions,which avoids the reinitialization of segmentation function during the iterative process.With the proposed algorithm and with the same initial contours,we compare the performance of these two high-order segmentation models and numerically verify the different properties of the two models. 展开更多
关键词 Augmented Lagrangian method Euler’s elastica image segmentation
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基于螺栓间弹性线曲率变化的螺栓松动视觉检测 被引量:2
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作者 曾飞 刘欣 +2 位作者 王涛 邓少华 余伟 《传感器与微系统》 CSCD 北大核心 2023年第11期131-134,共4页
为监测大型建筑等结构中众多螺栓的早期松动情况,提出了一种基于螺栓间弹性线曲率变化的螺栓松动视觉检测方法。通过在螺栓组间引入细弹性线来放大螺栓松动角度变化,以监测螺栓间弹性线上固定点的曲率来判断螺栓松动情况。首先,对螺栓... 为监测大型建筑等结构中众多螺栓的早期松动情况,提出了一种基于螺栓间弹性线曲率变化的螺栓松动视觉检测方法。通过在螺栓组间引入细弹性线来放大螺栓松动角度变化,以监测螺栓间弹性线上固定点的曲率来判断螺栓松动情况。首先,对螺栓间的弹性线进行图像采集并预处理;之后,使用Steger算法提取弹性线中心点亚像素坐标以提高检测精度;然后,建立弹性线拟合方程,计算弹性线的曲率;最后,监测弹性线上固定点的曲率变化,并根据该点的曲率值来判断螺栓松动角度。实验结果表明:该方法检测精度较高,能够有效对早期微小的螺栓松动角度进行检测。 展开更多
关键词 螺栓松动 弹性线 曲率 机器视觉 亚像素
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Poisson Noise Removal Based on Nonlocal Total Variation with Euler's Elastica Pre-processing
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作者 刘红毅 张峥嵘 +1 位作者 肖亮 韦志辉 《Journal of Shanghai Jiaotong university(Science)》 EI 2017年第5期609-614,共6页
An enhancement-based Poisson denoising method for photon-limited images is presented. The noisy image is firstly pre-processed for enhancing incomplete object information, and then it is denoised while preserving the ... An enhancement-based Poisson denoising method for photon-limited images is presented. The noisy image is firstly pre-processed for enhancing incomplete object information, and then it is denoised while preserving the restored structural details. A variational regularization model based on Euler’s elastica (EE) is proposed for image enhancement pre-processing. A nonlocal total variation (NLTV) regularization model is then employed in the second stage of image denoising. The above two optimization problems are solved by the alternating direction method of multipliers (ADMM). For Poissonian images with low image peak values, experiments demonstrate the validity and efficiency of the proposed method for both restoring geometric structure and removing noise. © 2017, Shanghai Jiaotong University and Springer-Verlag GmbH Germany. 展开更多
关键词 Image processing Optimization
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野生马鞍菌不同土层土壤养分分析
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作者 李云霞 柴美清 +4 位作者 李青 孙瑶 韩鹏远 张锁峰 陈金泉 《黑龙江农业科学》 2023年第12期64-67,74,共5页
为了明确野生马鞍菌的发生与生态环境、土壤环境的关系,便于驯化栽培,对山西岢岚地区野生马鞍菌发生处的生态环境和土壤环境进行了调查,测定并分析了该地野生马鞍菌发生处不同土层(0,5和10 cm)不同距离(0,50和100 cm)的土壤pH和土壤养... 为了明确野生马鞍菌的发生与生态环境、土壤环境的关系,便于驯化栽培,对山西岢岚地区野生马鞍菌发生处的生态环境和土壤环境进行了调查,测定并分析了该地野生马鞍菌发生处不同土层(0,5和10 cm)不同距离(0,50和100 cm)的土壤pH和土壤养分含量(包括有机质、碱解氮、有效磷、速效钾、有效铜、有效锌、有效铁、有效猛)。结果表明,野生马鞍菌发生地土壤pH在7.89~8.23之间,呈碱性,土壤中有机质26.37 g·kg^(-1),碱解氮、有效磷、速效钾、有效铜、有效锌、有效铁、有效猛含量分别为129.61,9.16,157.8,0.82,6.12,4.86和15.25 mg·kg^(-1)。马鞍菌发生处表层土壤中养分含量高于深层土壤,且随着土层深度的增加,土壤有机质、碱解氮、有效磷、速效钾、有效锰含量在逐渐降低;同时,马鞍菌发生处土壤中有机质、碱解氮、有效铜、有效锌、有效铁含量高于未发生处土壤,有效磷、速效钾、有效锰含量低于未发生处土壤。根据全国第二次土壤普查分级标准可知,在有机质含量中等、缺磷、富钾的碱性土壤中更容易发生野生马鞍菌。 展开更多
关键词 马鞍菌 土壤PH 土壤养分 不同土层
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不同浓度NaCl对巴西榕组培苗生理生化的影响
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作者 兰建彬 袁海英 陈泽雄 《湖北农业科学》 北大核心 2014年第2期362-365,共4页
试验研究了离体培养条件下,不同浓度NaCl对巴西榕(Ficus elastica‘Variegata’)组培苗生长的影响,以找出最适宜巴西榕茎段组织增殖的NaCl浓度。结果表明,巴西榕经0.02%NaCl处理后长势最好,生长指标测量值均高于对照组,达到最大;其丙二... 试验研究了离体培养条件下,不同浓度NaCl对巴西榕(Ficus elastica‘Variegata’)组培苗生长的影响,以找出最适宜巴西榕茎段组织增殖的NaCl浓度。结果表明,巴西榕经0.02%NaCl处理后长势最好,生长指标测量值均高于对照组,达到最大;其丙二醛(MDA)、可溶性糖和游离脯氨酸(Pro)含量均随NaCl浓度升高而上升,增殖芽数、茎高、茎围、鲜重、干重、叶绿素含量和过氧化氢酶(CAT)、过氧化物酶(POD)、超氧化物歧化酶(SOD)活性均随着NaCl浓度的升高呈先上升后下降的趋势。总体上NaCl浓度高于0.40%时,巴西榕的生长会受到抑制;高于0.80%时,巴西榕无法正常生长。 展开更多
关键词 巴西榕(Ficus elastica'Variegata’) NACL 组培苗 生理 生化
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基于模板的图像修复算法优先权的改进 被引量:4
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作者 王远敏 朱晓明 +1 位作者 孙雁飞 胡剑凌 《信息技术》 2008年第5期64-67,71,共5页
研究了基于块填充的图像修复算法,修复图像的质量容易受到待修复区域边界像素修复顺序的影响,通过分析待修复区域像素点所在模块的图像特征,改进了填充算法的优先权,分别是基于P-Laplace算子和Euler’s elastica模型的优先权计算方法的... 研究了基于块填充的图像修复算法,修复图像的质量容易受到待修复区域边界像素修复顺序的影响,通过分析待修复区域像素点所在模块的图像特征,改进了填充算法的优先权,分别是基于P-Laplace算子和Euler’s elastica模型的优先权计算方法的改进。实验结果证实了文中所介绍算法能有效提高重建图像的感知质量。 展开更多
关键词 图像修复 优先权 P_Laplace算子 Euler’s elastica模型
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马鞍菌子实体化学成分研究 被引量:9
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作者 麻兵继 申进文 +2 位作者 余海尤 李文 阮元 《西北植物学报》 CAS CSCD 北大核心 2009年第10期2115-2117,共3页
利用现代色谱技术和光谱技术从高等真菌马鞍菌(Helvella elastica)干燥子实体的甲醇提取物中分离并鉴定了6个化合物,它们分别是软脂酸(1)、麦角甾-5,22-二烯-3β-醇(2)、5α,8α-过氧化麦角甾-6,22-二烯-3β-醇(3)、尿嘧啶(4)、L-焦谷氨... 利用现代色谱技术和光谱技术从高等真菌马鞍菌(Helvella elastica)干燥子实体的甲醇提取物中分离并鉴定了6个化合物,它们分别是软脂酸(1)、麦角甾-5,22-二烯-3β-醇(2)、5α,8α-过氧化麦角甾-6,22-二烯-3β-醇(3)、尿嘧啶(4)、L-焦谷氨酸(5)和D-阿洛醇(6)。以上化合物均为首次从马鞍菌子实体中获得。 展开更多
关键词 马鞍菌 甾体 8α-过氧化麦角甾-6 22-二烯-3β-醇
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无溶剂聚氨酯弹性舰船地板材料的制备及性能研究 被引量:5
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作者 唐功庆 张梅 +2 位作者 罗玉媛 杨光付 姜志国 《化工新型材料》 CAS CSCD 北大核心 2011年第6期130-132,共3页
以组合聚醚多元醇、4,4′-二苯基甲烷二异氰酸酯(MDI)和3,3′-二氯-4,4′-二氨基二苯甲烷(MOCA)为原料制备了舱室用无溶剂聚氨酯弹性地板材料,研究了R值、扩链剂、填料等因素对其力学性能、阻燃性能等的影响规律。结果表明,该弹性地板... 以组合聚醚多元醇、4,4′-二苯基甲烷二异氰酸酯(MDI)和3,3′-二氯-4,4′-二氨基二苯甲烷(MOCA)为原料制备了舱室用无溶剂聚氨酯弹性地板材料,研究了R值、扩链剂、填料等因素对其力学性能、阻燃性能等的影响规律。结果表明,该弹性地板材料具有优良的弹性、强度、环保和施工工艺性,可以满足现代舰船舱室地板的性能要求。 展开更多
关键词 舰船 地板 弹性 无溶剂 聚氨酯
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欧拉弹性正则化的图像泊松去噪 被引量:6
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作者 张峥嵘 刘红毅 韦志辉 《电子学报》 EI CAS CSCD 北大核心 2017年第1期181-191,共11页
利用泊松噪声分布与图像灰度值相关这一特性,结合图像的水平集曲线对图像灰度值的刻画能力,在Bayesian-MAP框架下,提出了欧拉弹性正则与泊松似然保真的图像泊松去噪变分正则化模型.利用交替方向乘子法,将原问题转化为几个不同低阶子问... 利用泊松噪声分布与图像灰度值相关这一特性,结合图像的水平集曲线对图像灰度值的刻画能力,在Bayesian-MAP框架下,提出了欧拉弹性正则与泊松似然保真的图像泊松去噪变分正则化模型.利用交替方向乘子法,将原问题转化为几个不同低阶子问题的求解.对于子问题中出现的高阶非线性项,利用滞后扩散不动点迭代进行线性化,从而得到模型的快速迭代求解算法.通过数值模拟实验,证明了当图像受不同强度泊松噪声影响时,所提出的泊松去噪方法都能够有效的抑制泊松噪声,同时具有良好的结构保持性能. 展开更多
关键词 泊松去噪 欧拉弹性 水平集 变分正则化
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花叶富贵榕组培快繁技术研究 被引量:4
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作者 林加根 陈石 +2 位作者 吴松海 林霜霜 林一心 《江西农业学报》 CAS 2011年第12期55-56,共2页
研究了花叶富贵榕的组培快繁技术。结果表明:最佳外植体为一年生的茎尖或茎段;继代增殖最佳培养基为MS+BA 2.00 mg/L+NAA 0.05 mg/L;最佳生根培养基为1/2 MS+NAA 0.5 mg/L;2000~2500 lx的光照强度有利于芽苗的生长;泥炭土基质有利于试... 研究了花叶富贵榕的组培快繁技术。结果表明:最佳外植体为一年生的茎尖或茎段;继代增殖最佳培养基为MS+BA 2.00 mg/L+NAA 0.05 mg/L;最佳生根培养基为1/2 MS+NAA 0.5 mg/L;2000~2500 lx的光照强度有利于芽苗的生长;泥炭土基质有利于试管苗的移栽成活。 展开更多
关键词 富贵榕 激素 组织培养 快速繁殖
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橡皮树的快速繁殖及试管苗温室移栽管理 被引量:2
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作者 王富兰 周晓龙 谢新民 《新疆农业科学》 CAS CSCD 2004年第4期213-215,共3页
以橡皮树(Ficuselastica)顶芽或带腋芽茎段做为外植体。实验表明橡皮树快速繁殖的适宜培养基为MS+6-BA1.0~2.0mg/l+NAA0.01~1.0mg/l。生根培养基为1/2MS+NAA0.1mg/l+IBA0.5mg/l的沙基培养基。橡皮树最适的培养温度为26~31℃。移栽采... 以橡皮树(Ficuselastica)顶芽或带腋芽茎段做为外植体。实验表明橡皮树快速繁殖的适宜培养基为MS+6-BA1.0~2.0mg/l+NAA0.01~1.0mg/l。生根培养基为1/2MS+NAA0.1mg/l+IBA0.5mg/l的沙基培养基。橡皮树最适的培养温度为26~31℃。移栽采用蛭石作为苗床基质。通过合理的环境控制提高成活率。 展开更多
关键词 橡皮树 快速繁殖 试管苗 温室 移栽 外植体 培养基 观叶植物
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营养液的组成及理化性质对红榕生长的影响 被引量:3
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作者 刘奕清 王大平 杨勇 《西南农业大学学报(自然科学版)》 CSCD 北大核心 2006年第4期595-597,共3页
试验研究了无土栽培营养液的组成、电导率和pH对红熔幼苗生长的影响,结果表明:3种配方营养液都可用于红榕幼苗无土栽培,但C配方最节省成本。电导率为1.5 mS/cm时,植株生长优于电导率为0.5 mS/cm和1.0 mS/cm处理,但对根的影响不大... 试验研究了无土栽培营养液的组成、电导率和pH对红熔幼苗生长的影响,结果表明:3种配方营养液都可用于红榕幼苗无土栽培,但C配方最节省成本。电导率为1.5 mS/cm时,植株生长优于电导率为0.5 mS/cm和1.0 mS/cm处理,但对根的影响不大。营养液的pH为5.5时有利于植株生长。 展开更多
关键词 红榕 水培 营养液 电导率 PH
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