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   过渡曲线 在 建筑科学与工程 分类中 的翻译结果: 查询用时:0.541秒
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  transition curve
The shape of the Fermi surface and phase transition curve are sensitive to the value and sign of the hopping interaction t' between diagonal neighboring sites.
      
It is found that the tricritical point on the phase-transition curve corresponds to a much lower pressure and a considerably higher temperature (Ptr ≈ 0.355 GPa and Ttr ≈ 25.2 K) than was reported earlier (Ptr ≈ 1.2 GPa and Ttr ≈ 12 K).
      
While the metal-insulator transition curve of the () phase diagram exhibits a first order character, a "spin-flop" transition line divides the insulating state when the magnetic field is applied along the easy axis of magnetization.
      
Current and field shift the transition curve to lower temperatures, except near the onset of superconductivity where the core of the wire influences the transition.
      
Penetration effects must be accounted for the width of the inductive transition curve if the interior of the sample is not completely shielded by current loops.
      
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This paper presents the conjugate corresponding-point formulations of interaxes involute helical, which is applicable to regular and irregular mesh states,and from which it derives the root-cutting determination condition formula of interaxes involute gears,interference determination condition formula of transition-curve, and calculation formula of overlapping coefficient and theoretical width of (helical) gears. All these formulas can be used for separation from coordinate.

本文论证推导了适用于规则状态及非规则状态啮合的渐开螺旋面交错轴共轭对应点方程。文章应用对应点方程导出了渐开线齿轮交错轴啮合的根切判断条件式、过渡曲线干涉判断条件式、(斜)齿轮理论齿宽计算公式以及重合度计算公式。这些方程、公式都可以脱离坐标系来使用。

Finite element method for dynamic stability of beams is presented in this paper.The mass,stiff-ness as well as geometrical stiffness matrixes and corresponding Hill equation of parametrically excitedvibration of beams are given. By ccordinate transformation methed,the normal Mathieu equation ofmultidegrees of freedom systems is obtained.The method of strained parameters and the method ofmultiple scales for analysis of parametric resonance and combinational parametric resonance are given.Finally, parametrically...

Finite element method for dynamic stability of beams is presented in this paper.The mass,stiff-ness as well as geometrical stiffness matrixes and corresponding Hill equation of parametrically excitedvibration of beams are given. By ccordinate transformation methed,the normal Mathieu equation ofmultidegrees of freedom systems is obtained.The method of strained parameters and the method ofmultiple scales for analysis of parametric resonance and combinational parametric resonance are given.Finally, parametrically excited vibration of a simple supporting beam is pressented as an example.

提出了对梁进行动力学稳定性分析的有限元方法──给出了单元质量矩阵,抗弯刚度矩阵,几何刚度矩阵及相应的Mathieu方程,通过坐标变换消除了方程的动力与静力耦合,然后说明了由这种具有参数激励耦合的多自由度系统的Mathieu方程求得系统一般参数共振及组合参数共振的过渡曲线的约束参数方法与多尺度方法。最后作为算例求出了均匀简支梁受简谐轴向力作用时的过渡曲线

The method of equivalent loads is used widely in the design of prestressed reinforced concrete structures. Considered construction technique, the transition curve for the shape of steel wire exists in middle support. So equivalent loads can not counterweigh the dead and live loads acting on beams. Applying the principle of structural mechanics, the formula for estimating the counterweigh loads acting on the beam is provided. The proposed practical method satisfies the requirement of design.

荷载平衡法已广泛地应用于预应力混凝土结构的设计。在超静定预应力混凝土结构中由于施工要求,预应力筋实际线形在中间支座处不可避免地存在一过渡的曲线,使得预应力等效荷载不能全部与梁上均布荷载相抵消。根据结构力学原理对荷载平衡法进行改进,能针对预应力筋线形的实际布置情况方便地估算出等效荷载的大小。

 
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