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variable sections
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  变截面
     The trestle bridge of Yantai-Dalian Railway Ferry is designed as two-span through steel plate girders of fully-welded variable sections with span arrangement 52.645 m+29.855 m.
     烟大轮渡铁路栈桥采用两跨式全焊变截面下承式钢板梁,跨度为52.645 m+29.855m。
短句来源
     Finite Element Analysis on the Rigid-frame with Variable Sections
     变截面刚架的有限元分析
短句来源
     A differential quadrature element method (DQEM) was presented for the analysis of portal frames with variable sections.
     本文采用一种精确、简便的数值计算方法———微分求积单元法(DQEM)对变截面门式刚架结构进行了力学分析。
短句来源
     Control of a moving flexible robot arm with variable sections
     柔性变截面滑移式机械手的控制
短句来源
     STUDY ON VERTICAL VIBRATION OF VISCOELASTIC PILE WITH VARIABLE SECTIONS IN LAYERED SOILS
     成层土中粘弹性变截面桩纵向振动分析及应用
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  “variable sections”译为未确定词的双语例句
     Analysis of the Bearing Performance of Reinforced Concrete Variable Sections Piles
     钢筋混凝土旋扩变径桩受力性能分析
短句来源
     A SUGGESTED THEORY OF APPLIED ELASTIC SHELL-STRUCTURE FOR SPACE THIN-WALLED SYSTEM OF VARIABLE SECTIONS
     变断面空间薄壁体系一种实用弹性壳体理论的建议
短句来源
     Programming design of prestressed concrete in double slope and double T-shape board of variable sections
     预应力混凝土双坡双T型变截面板程序设计
短句来源
     The Initial Parameter Method for Static and Dynamic Analysis of Frame Shear-Wall Structures with Variable Sections
     变刚度框架—剪力墙结构静动力分析的初参数法
短句来源
     Based on mathematical model with continuous technique in this paper, the frame shear-wall structures with variable sections is simplified as a cantilever beam with variable stiffness, and each floor's shear-wall equivalent bending and frame equivalent shearing stiffness are derived.
     本文基于连续化的数学模型,把变刚度框架—剪力墙结构简化为分段变刚度的悬臂梁,推导了变刚度框架—剪力墙结构各层的剪力墙等效抗弯刚度及框架等效抗剪刚度。
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  相似匹配句对
     Analysis of Portal Frames with Variable Sections by DQEM
     变截面门式刚架结构分析的微分求积单元法
短句来源
     The Analytical Solution of Conical Clamp Ring with Variable Sections
     锥形变截面弹性环问题的解析解
短句来源
     It has two sections.
     本章分为两节。
短句来源
     Sections and Conveners
     专题论坛与召集人
     On Selection of the Variable
     关于自变量的选择
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  variable sections
We determine the theoretical and experimental values of the critical follower loads for rods with constant and stepwise-variable sections.
      
Stability computation of steel posts of constant and stepwise-variable sections in the elastoplastic region under an arbitrary l
      
Weightingconsists of excluding variable sections anddifferential weighting of substitutions.
      
Different pairings of variable sections are given to each subsample of subjects.
      
All subjects are given testX plus two variable sections from either testY orZ.
      


This paper deals with the deflection of the Liberty ship resting on keel blocks during drydocking, which is regarded as a continuous beam of variable section and rigidity resting on an elastic foundation. By means of energy method we can adopt deflection curve of the vessel in the form of harmonically vibrating function. Thus the following basic differential equation [EI(x)y"-]" +k(x) y=q(x) may be expressed as linear simultaneous equations where S~(i)_n denotes the function of the moment of inertia, η~(i)_n...

This paper deals with the deflection of the Liberty ship resting on keel blocks during drydocking, which is regarded as a continuous beam of variable section and rigidity resting on an elastic foundation. By means of energy method we can adopt deflection curve of the vessel in the form of harmonically vibrating function. Thus the following basic differential equation [EI(x)y"-]" +k(x) y=q(x) may be expressed as linear simultaneous equations where S~(i)_n denotes the function of the moment of inertia, η~(i)_n denotes the function of the elastic foundation modulus of the keel blocks, Q_i denotes the function of load intensity of the vessel. Some features in ship-repairing have been taken into consideration, the original deflection exists such as before dry-docking and the effect of shear deflection occurs when large shell plates are removed from the side of hull. A simple and approximate formula is derived to evaluate them. Calculations applied to the Liberty ship also illustrate the effects of some technological factors in the process of ship-repairing such as (1) shifting the blocks, (2) removing shell plates at the side of hull, (3) the water test. This paper contains a series of interesting data obtained from the Liberty ship during drydocking, together with theoretical analysis the following conclusions may be drawn. Ⅰ. The results of theoretical calculations differ from those obtained by measurement, the main reason of which is that the calculations neglect the existence of the original deflection of the vessel and the gaps in the wooden structure of keel block. Ⅱ. Among the factors effecting on delection, the shifting of keel blocks has greater effect than the water test and the removal of shell plates has the least. Ⅲ. As required in ship-repairing, any removal of large shell plates at the side of hull should take into account at the same time the effect of shear deflection. Ⅳ. The deflection of the vessel during dry-docking mainly depeds upon the original deflection, the load intensity of the vessel, and the arrangement of the keel blocks. For the Liberty ship it is nsnally found to bend upwards amidships or to hog.

本文把安置在干塢中龙骨墩上修理的自由輪的变形,视为彈性基础上的变断面、变剛性連續梁来計算,应用能量法选择主振动形式函数来表示船身撓曲曲线。这样基本微分方程 [EI(x)y″]″+k(x)y=q(x) 可以用绕性联立方程組来表示: sum from i=1 to n[I_0/L~4S_n~((i))+k_0η_n~((i))]A_n=q_0Q_i式中S_n~((i))、η_n~((i))、Q_i分别表示慣性矩、彈性基础剛性系数和船身重量的分布函数。进而考虑了修船生产的特点,論述了(1)船体修理前的初始撓度;(2)拆落大面积船側外板时剪切变形的影响。也给出了近似計算公式。通过对自由輪的实例計算討論了修理过程中的下列工艺因素:(1)移动龙骨墩;(2)拆落船体外板;(3)装水試驗对船体变形的影响。并作了定性上的分析。本文还統計了一系列自由輪变形測量资料,进行整理并繪成图表。在理論分析和实际测量基础上,可以得到下列主要結論: 1.理論計算值和实际测量值相差較大,其主要原因是計算中沒有考虑墩木的間隙和船身的初始撓曲的影响。 2.在影响塢修变形的諸因素中,以移动龙骨墩的影响最大,装水次之,拆落外板影响較小。 3.在修理过程...

本文把安置在干塢中龙骨墩上修理的自由輪的变形,视为彈性基础上的变断面、变剛性連續梁来計算,应用能量法选择主振动形式函数来表示船身撓曲曲线。这样基本微分方程 [EI(x)y″]″+k(x)y=q(x) 可以用绕性联立方程組来表示: sum from i=1 to n[I_0/L~4S_n~((i))+k_0η_n~((i))]A_n=q_0Q_i式中S_n~((i))、η_n~((i))、Q_i分别表示慣性矩、彈性基础剛性系数和船身重量的分布函数。进而考虑了修船生产的特点,論述了(1)船体修理前的初始撓度;(2)拆落大面积船側外板时剪切变形的影响。也给出了近似計算公式。通过对自由輪的实例計算討論了修理过程中的下列工艺因素:(1)移动龙骨墩;(2)拆落船体外板;(3)装水試驗对船体变形的影响。并作了定性上的分析。本文还統計了一系列自由輪变形測量资料,进行整理并繪成图表。在理論分析和实际测量基础上,可以得到下列主要結論: 1.理論計算值和实际测量值相差較大,其主要原因是計算中沒有考虑墩木的間隙和船身的初始撓曲的影响。 2.在影响塢修变形的諸因素中,以移动龙骨墩的影响最大,装水次之,拆落外板影响較小。 3.在修理过程中,如大面积拆落船侧外板(尤其在1/4L处)时、必須計入剪切对于船体变形的影响。 4.船舶修理过程中的变形,主要是取决于船舶的初始撓曲和船身重量及墩木的分布。以自由輪而言,通常以呈中拱变形较为普遍。

It is known that when calculating the bending parameter of a stepped beam with variable section, it is desirable to reduce the beam into an equivalent one with equivalent section. Then the bending parameter can be directly obtained by the general formula derived from initial parameter. This method makes it possible to solve the statically determinate as well as statically indeterminate problems of the stepped beam with variable section.

计算阶梯状变截面梁的弯曲参数时,可先将阶梯状变截面梁化为等载面的等价梁,然后根据等载面的等价梁的初参数法通用公式迳直求得阶梯状变截面梁的弯曲参数.利用这一方法,能够解决阶梯状变截面梁的静定问题以及静不定问题.

A calculation of the critical speed of a rotating disk and shaft system is obtained by F.E.M. The portions of disk and shaft of variable sections are described approximately by conical portions respectively. The displacement in the element is interpolated by a three-order polynomial fanetion. ln the calculation, the gyroscopic moment of the disk and shaft is taken into consideration. As for the vanes(straight and torsional), a suitable simplificafion is made. The influences of shaft shear and the oil fire...

A calculation of the critical speed of a rotating disk and shaft system is obtained by F.E.M. The portions of disk and shaft of variable sections are described approximately by conical portions respectively. The displacement in the element is interpolated by a three-order polynomial fanetion. ln the calculation, the gyroscopic moment of the disk and shaft is taken into consideration. As for the vanes(straight and torsional), a suitable simplificafion is made. The influences of shaft shear and the oil fire rigidity of the bearing are neglected, and the bearing surface is considered rigid. This paper discusses a suitable method by which to calculate the critical speed of complex and multi-span rotating shafts. The computer program input only requires the information of constants of the material properties, the dimensions of elements, the number of elements and nodal points. Therefore, it is convenient to use. This method enables us to calculate the lowest critical speeds and modes.

本文对变截面的轮或轴分段用锥面的轮或轴来近似,单元内的位移用轴段端部位移作三次函数插值。考虑了轮和轴的回转仪力矩,对叶片(直叶片和扭曲叶片)也作了适当的处理。没有考虑轴的剪切及轴承油膜刚度的影响,轴承只作为刚性支座来考虑。本方法适合于计算结构复杂、多跨的转轴的临界转速。所编程序只需输入转轴的材料性质的有关常数、单元的尺寸及单元、结点编号等信息,使用方便。可计算前数阶临界转速和振型。

 
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