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Search Results: 1 - 10 of 288176 matches for " 李遇春 "
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移动容器中液体晃动的二种速度势描述及其等价性证明
Two Velocity Potential Descriptions for Fluid Sloshing in Moving Tanks and Their Equivalence Proof
 [PDF]

胡奇,
International Journal of Fluid Dynamics (IJFD) , 2016, DOI: 10.12677/IJFD.2016.42003
Abstract: 不同的工程学科采用二种不同的速度势函数来描述运动容器中理想流体的晃动,所得到的运动方程不尽相同,然而这二个速度势不加区分地都称为“速度势函数”,这会给跨学科的研究带来理论上的混乱,这一问题在现有文献中似乎并未得到澄清。本文采用“相对速度势”与“绝对速度势”分别建立了运动容器中液体的晃动方程,证明了二种速度势方程的等价性,对于地震工程而言,“绝对速度势”与“相对速度势”分别适用于容器的地震激励为速度与加速度的情形。
In the existing literature, there were two different velocity potential functions being used in the different engineering disciplines for describing the motions of ideal fluid in the moving tanks. The resulting equations of motion were not identical. However, the two different velocity potentials were both called “velocity potential function” in the different engineering disciplines. It might result in a theoretical confusion in the interdisciplinary researches. This issue seemed not being clarified in the existing literatures. This paper will respectively propose the “absolute velocity potential” and the “relative velocity potential” to establish the motion equations of fluid, and prove the equivalence of the two descriptions. For the earthquake engineering, the “absolute velocity poten-tial” and “relative velocity potential” are respectively suitable for describing the motions of fluids subjected to velocity and acceleration (seismic) excitations.
任意转动激励下液体对矩形容器作用的精确解
An Exact Solution of Fluid Action on Rectangular Tank Subjected to Arbitrary Pitching Excitation
 [PDF]

,
International Journal of Fluid Dynamics (IJFD) , 2019, DOI: 10.12677/IJFD.2019.74011
Abstract:
矩形贮液容器承受转动运动激励时,液体会产生晃动,从而对容器及相关的结构产生附加的动力效应,对相关结构安全性、稳定性以及动力学行为产生重要影响。基于晃动动力学的一般方程,在小晃动假设下,本文采用线性势流理论,给出了矩形贮液容器在纯转动激励下的液体晃动线性化控制方程,通过求解液体运动方程得到液体速度势函数,由Bernoulli方程得到矩形容器内液体压力分布的精确解,通过压力积分进而得到液体对矩形容器的动态力与翻转力矩精确解,进行了液体共振激励的响应计算。精确解的适用范围为转动激励下的线性晃动问题,研究结果可为液体晃动计算及相关工程设计提供参考。
When a rectangular liquid-storage tank is subjected to a pitching excitation, a slosh of the contained liquid is excited. The additional dynamic effects of sloshing will be exerted on the tank and the associated structure, which will lead to an important influence on the safety, stability and dynamic behavior of the associated structure. Based on the general equations of sloshing dynamics, under the assumption of small sloshing, this paper uses the linear potential flow theory to derive the linearized governing equations of liquid sloshing subjected to a pure rotating excitation. The velocity potential function is obtained through solving the governing equations of liquid motion. The exact solution of the liquid pressure distribution in the rectangular container is solved by using Bernoulli equation. The exact dynamic force and the overturning moment that act on the tank are further obtained through a pressure integral. A numerical example of liquid resonance response of is calculated. The application cope of present exact solution is limited to the linear sloshing problem subjected to a pitching excitation. The present result can be used as a reference for sloshing computation and the related engineering designs.
矩形容器中流体晃动等效模型的建议公式
,来明
地震工程与工程振动 , 2013,
Abstract: 根据矩形容器中流体晃动等效模型的精确解,采用非线性拟合算法,给出了等效模型中脉冲质量及其位置的拟合公式,本文给出的拟合公式比精确解简单、且计算精度远高于Housner公式,可以作为精确解良好的替代公式。建议采用本文公式(3)~(8)作为矩形容器内流体晃动等效模型的计算表达式。
在旧体诗词与新体小说之间――论王统照的文体选择
,,
- , 2018,
Abstract: 王统照虽以新文学家著称,但其旧体诗词造诣极深。王统照的旧体诗词与新体小说在题材与意蕴、意象与意境等方面有契合之处,这就构成了新旧两种文体的互渗与交集。在文体功能上,王统照的旧体诗词多为抒怀之作,直呈作者的内心世界,体现出“言志”特征;新体小说则成为王统照关注社会、描摹人生的启蒙工具,承担着“载道”职责。在宗教意识上,王统照的旧体诗词与东方佛教文化相契合,新体小说则传递西方基督教的文化思想。正是通过新旧两种文体的间离与分途,王统照文学世界的丰富性与立体性才得以凸显。在王统照不同的人生阶段中,他对新旧两种文体的选择呈现出一种错位关系,这构成了另一种艺术间离效果。当他主攻旧体诗词创作之时,新体小说几乎被搁置,而当他沉醉于新体小说创作之时,旧体诗词同样被弃置。相对而言,旧体诗词更多面向自我,主内主情,而新体小说则更贴近时代,主外主理,而文体选择则取决于作家的内在精神与外部语境的关系
Wang Tongzhao is known for his achievement in new literary writings ( in particular novelwriting ), but he was also very good at old literary genres especially ancient Chinese poems. However, Wang’sold-style poems and new-style novels share great commonality in such aspects as the theme, implication,imagery and artistic conception, which constitutes the interaction and intersection of the two new and oldgenres. In the stylistic function, his old-style poems are mostly the works directly showing the author’s innerworld and embodies the characteristic of the traditional Chinese poems which were intended to yanzhi 言志 (literallyexpress the poets’ aspirations ); his new-style novels became his tool to do enlightenment by paying attention tothe society and people’s life, thus fulfilling the long-pursued function of zaidao 载道 ( literally to carry the principle )in Chinese literary tradition. In terms of the religious issues, Wang’s old-style poems are in accordance with theEastern Buddhist culture, while his new-style novels convey the cultural thought of Western Christianity. It issuch differences and divisions that fully display the richness of Wang Tongzhao’s literary world. At differentstages of his life, Wang had different focuses in his literary creation: while he concentrated on old-style poems,he almost did nothing in new-style novel creation or vice versa. This kind of choice between the two literarygenres constitutes a unique artistic feature ( i.e. separation and dislocation in genres ) of Wang’s literary works.This is closely related to the writer’s self-cognition. Comparatively speaking, the old-style poems is more selforiented,mainly expressing the inner mind, while the new-style novel is closer to the times, mainly expressingthe general reason and principle. Therefore, it is safe to say that the choice of genre and style depends on thewriter’s internal world and his external environment
“名士风姿战士骨”——陶军旧体诗词创作流变论
The Evolution of Tao Jun’s Old Poetry Creation

 王 彪
- , 2018,
Abstract: 摘要 陶军一生的旧体诗词创作可用“名士风姿战士骨”这句诗概其全貌。“战士风骨”指其以现代革命集体意志书写为内核所形成的激昂、质朴、通俗的显在诗艺取向,而“名士风姿”指其深受古典名士风度影响所形成的个人化情志流露以及幽婉、清丽、含蓄的深层诗艺取向,二者互为表里、彼此契合。在时代语境、个人心境、艺术取境的共同作用下,陶军的旧体诗词创作形成了不同的阶段性:在革命战争时期(1937-1949),陶军由爱国知识青年跃变为革命战士,其诗作远承陆游悲愤激昂余绪,近受延安诗风熏陶,多属激昂质朴的军旅诗词。“十七年”时期(1949-1966),陶军由革命战士转为教育家和学者,所作或陶怡山水,或重检江山,或讴歌新气象,因受陶、谢影响,多为自然清丽的纪游诗词。十年浩劫时期(1966-1976),陶军虽境遇惨淡,但其风骨屹立不移,以偏于沉郁内敛的咏怀诗词创作为主。“新时期”(1977-1987)以降,陶军老骥伏枥,桑榆未晚,所作多为平易畅达的赠答悼挽诗。纵观陶军的诗词人生,其诗学选择与现代民族国家的命运休戚相关。
Abstract:Tao Jun’s old poetry creation has the characteristics of “the warrior spirit” and “the charm of learned celebrity”. “The warrior spirit” refers to the passionate, simple and popular poetic art orientation formed by the modern revolutionary collective will, and “the charm of learned celebrity” refers to the personal emotions formed by the influence of classical celebrity style and the quiet,clear and subtle deep poetic orientation as well. The two characteristics are in line with each other and fit each other. Throughout Tao Jun’s poetry life,it is showed that his choice of poetics is closely related to the destiny of the modern nation.
悬臂梁-流体-悬臂梁耦联系统的湿模态相互作用
,朱暾,白冰
工程力学 , 1998,
Abstract: 应用流体的势流理论及悬臂梁振动方程,本文分析了悬臂梁流体悬臂梁耦联系统的自由振动问题。分析表明,悬臂梁除与流体发生相互作用外,两悬臂梁湿模态通过流体的耦合也发生相互作用,后者的作用使流固耦联系统的湿模态呈现新的振动特性,同一阶两个子结构(梁1,2)各自的干模态分别对应耦联系统同一阶的两个湿模态,一个以较低的湿频率出现,两梁呈反相位振型,另一个以较高的湿频率出现,两梁呈同相位振型。
多悬臂梁–流体的模态耦合与拍振研究
Research on Modal Coupling and Slap Phenomenon of Multi-Cantilever Beam-Fluid Structure
 [PDF]

陆艺, 南生,
International Journal of Mechanics Research (IJM) , 2019, DOI: 10.12677/IJM.2019.83020
Abstract: 本文采用ANSYS软件对多悬臂梁–液体耦合系统进行了模态分析,得到了结构系统湿频率随液体宽度的变化规律,其结果与理论解答一致;研究了多悬臂梁–液体体系的拍振现象,在多梁–液体体系中,不仅存在梁与液体的相互作用,同时也存在梁与梁的相互作用,梁间相互作用随着梁间液体宽度的增加而减弱;系统拍振现象是由梁间相互作用产生的模态频率差导致,由于不同振型对不同梁位移函数贡献不同,不同梁的拍现象频率及振幅一般不同。
In this paper, the modal analysis of multi-cantilever beam and fluid system is carried out by ANSYS code. The variations of wet frequencies of coupling system with the fluid width are obtained. The results agree well with the theoretical solutions. The beat vibration of multi-cantilever and fluid system is studied. In multi-cantilever beam and fluid system, not only there is interaction between beam and fluid, but also the interaction between the beams. The interaction effect between beams decreases with the increase of fluid width between beams. The difference of modal frequency caused by the interaction between beams results in beat vibration of multi-cantilever and fluid system. Because the different contributions of mode shapes are given to the displacement functions of different beams, the frequency and amplitude of beat vibration are generally different for the different beams.
LB方法应用实例——水电站水锤计算
程永光,张慧,
力学与实践 , 1998, DOI: 10.6052/1000-0992-1999-276
Abstract: 建立了模拟水电站水锤的一维LB模型.通过实例计算与特征线法进行了比较,结果表明LB方法效果很好,将之引入水电站流场模拟是可行的,值得进一步探讨.
大型渡槽的竖向地震效应分析
,楼梦麟,周成
地震工程与工程振动 , 2008,
Abstract: 基于流体的位移有限元模式,借助于Ansys程序,考虑流体与结构之间的相互作用(作滑动边界处理),对3种型式的渡槽结构竖向地震效应进行了时程与反应谱分析。计算结果具有较好的精度,满足工程要求。本文的方法也可直接用于大型渡槽的水平地震效应分析。对于不同结构型式的渡槽,在七度抗震设防时,建议适当考虑竖向地震效应。
圆管渡槽抗震计算流体等效简化模型
,余燕清,王庄
南水北调与水利科技 , 2015,
Abstract: 提出了一个圆管渡槽内流体晃动分析的等效简化模型。将圆管渡槽内的水体假定为无黏性、无旋、可压缩及小幅晃动的流体,横向晃动的流体可等效为一个固定质量m0与一个质量2弹簧系统(m1,k1),根据等效原则,即实际的流体系统(采用有限元模拟)与等效模型具有相同的一阶自然晃动(振动)频率,以及对槽身具有相同的作用效应。采用最小二乘算法,通过数值拟合可得到等效模型中固定质量m0、弹簧振子(m1,k1)及其位置的近似计算公式。应用流体等效简化模型和有限元模型分别对某一管线桥流体2结构耦合系统的自振频率与地震反应进行了计算分析,数值算例表明两个模型的计算结果非常吻合,验证了流体等效模型的有效性与适用性,为圆管渡槽支撑结构地震反应分析提供一个简化的流体计算模型,可为渡槽抗震研究者与结构工程师提供参考。
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