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Based on simple mechanical model, a concept of virtual bending stiffness and calculating method of critical stress of sheet's wrinkling are presented.

运用能量原理和有限元方法，从较简单的力学模型出发，提出了虚拟刚度的概念和板料起皱的临界应力的计算方法。

A clearance-typed nonlinear torsional vibration model with multiple degree of freedom of star gear transmission being excited by errors of transmission and time varying meshing stiffness was established.

建立了受传递误差和时变啮合刚度激励的星型齿轮传动的间隙型多自由度非线性扭转振动模型，并用自适应变步长Gill数值积分方法进行了求解。

Model of series spring truss elements is put forward according to square tubular joint's local stiffness in the paper, which meets the designing requirements and is testified by numerical examples.

方管节点的局部平动位移和局部平动刚度的分析。

Experimental results showed that a better test of the oscillator Harmonic Oscillator cycle and the quality is proportional to the square with, and spring stiffness coefficient is inversely proportional to the square root of the spring up within the limits of flexibility and oscillator unrelated to the amplitude, Guide and the tilting reading irrelevant; the amplitude does not exceed the elastic limit of spring, the rail mill Sassafras of small conditions, oscillator is a very good harmonic vibration model.

实验结果发现，较好的验证了弹簧振子的简谐振动周期与振子的质量的平方跟成正比，与弹簧的劲度系数的平方根成反比，在不超过弹簧的弹性限度内与振子的振幅无关，与导轨的倾斜读无关；在振幅不超过弹簧的弹性限度、导轨上的磨檫力很小的条件下，弹簧振子是一个很好的简谐振动模型。

Experimental results showed that a better test of the oscillator Harmonic Oscillator cycle and the quality is proportional to the square with, and spring stiffness coefficient is inversely proportional to the square root of the spring up within the limits of flexibility and oscillator unrelated to the amplitude, Guide and the tilting reading irrelevant; the amplitude does not exceed the elastic limit of spring, the rail mill Sassafras of small conditions, oscillator is a very good harmonic vibration model.

实验结果发现，较好的验证了弹簧振子的简谐振动周期与振子的质量的平方跟成正比，与弹簧的劲度系数的平方根成反比，在不超过弹簧的弹性限度内与振子的振幅无关，与导轨的倾斜读无关；在振幅不超过弹簧的弹性限度、导轨上的磨檫力很小的条件下，弹簧振子是1个很好的简谐振动模型。

Then the influence of flow, pipe length, setting pressure of relief valve and stiffness coefficient of main valve spring on the water hammer peak pressure at the instant of fuel pistol closing was studied according to the detected pressure signals. Finally, the relatively accurate gas-liquid separation value and critical cavitation pressure value of the system was obtained by frequency analysis and wavelet analysis.

根据测得的压力信号，对燃料枪关闭瞬间流量、管长、溢流阀调定压力以及主阀弹簧刚度对水击效应引起的峰值压力的影响进行研究，并通过频率分析方法和小波分析方法较精确地获得系统的气液分离值和临界汽蚀压力点。

Then the influence of flow,pipe length,setting pressure of relief valve and stiffness coefficient of main valve spring on the water hammer peak pressure at the instant of fuel pistol closing was studied according to the detected pressure signals.

该测试平台不仅能实时可靠地对系统压力进行定量诊断与识别，同时还可以为燃料泵送系统的性能优化提供依据。

It includes back, left spring, left sliding block, right sliding block, right spring and cylinder. They are formed stiffness changing mechanism in back. The left spring is set between the left vertical surface of the left sliding block and the left inner wall of the back. The right spring is right the opposite.

基座内的左弹簧、左滑块、圆柱、右滑块和右弹簧组成一个变刚度机构，左弹簧位于左滑块的左侧垂直面与基座的左侧内壁之间，右弹簧位于右滑块的右侧垂直面与基座的右侧内壁之间，圆柱居中地被左、右滑块的曲面所支撑。

Regarding the forming of thin long spline shaft, its stiffness and stability are the first consideration need to be solved besides common factors in extrusion must be considered.

关于细长花键轴的成型，它的刚性和稳定性是除了挤压必须要考虑的共同因素外，首先要解决的问题。

Regarding the forming of thin long spline shaft, its stiffness and stability are the first consideration need to be solved besides common factors in extrusion must be considered.

关于细长花键轴的成型，在考虑射出过程的常用因素之外，它的坚硬度和稳定性是需要首先考虑解决的，否则无法制作出合格的产品。

Lugalbanda was a god and shepherd king of Uruk where he was worshipped for over a thousand years.

Lugalbanda 是神和被崇拜了一千年多 Uruk古埃及喜克索王朝国王。

I am coming just now,' and went on perfuming himself with Hunut, then he came and sat.

我来只是现在，'歼灭战perfuming自己与胡努特，那麼，他来到和SAT 。