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Also only permanent observatories supply sufficient accurate data, and their distribution on the Earth is very irregular.


The provision of sufficient accurate information will allow managers to make important decisions that will affect the organisation as a whole.


For the reference sensitivity test case the demonstrated simple approximation gives a sufficient accurate result.


For this work the baseline was automatically derived, because the available DEM was not precise enough to give sufficient accurate elevation values.


Essays graded A to C will be clearly focused on the question but must also be accompanied by sufficient accurate, relevant, supporting material.




 The stiffness of the connection joint which connect different parts of a complex structure can be extracted by identification method.Using the modal synthesis technique,the structure is divided into many substructures and some connecting substructures with unknown stiffess parameters.The optimal method is thenused to identify these parameters.It is believed that sufficient accurate resultscan be cbtained with less amount of computation by the use of this method.  由若干部件经一定的连接部件组成的复杂结构系统,其连接部件的连接刚度可通过参数识别的方法来提取。本文根据连接子结构的概念,应用模态综合技术,以子结构方式来处理整个系统、应用优化方法进行连接刚度参数识别,以很少的运算量以足够的精度,建立完善的结构动力模型。  The cnoidal wave theory is applicable to shallow water area and can fairly descride the kinematic behaviours of waves in nearshore zone, such as water particle velocities, wave celerity and the wave profile. It is known that the solution of the cnoidal wave theory is given in terms of elliptic integrals and Jacobian elliptic functions Due to the complication of calculation of elliptic integrals and Jacobian elliptic functions,the cnoidal wave theory has only a restricted applications. By applying power series... The cnoidal wave theory is applicable to shallow water area and can fairly descride the kinematic behaviours of waves in nearshore zone, such as water particle velocities, wave celerity and the wave profile. It is known that the solution of the cnoidal wave theory is given in terms of elliptic integrals and Jacobian elliptic functions Due to the complication of calculation of elliptic integrals and Jacobian elliptic functions,the cnoidal wave theory has only a restricted applications. By applying power series to express these quantities a numerical calculation of the cnoidal wave theory is pressented in this paper. It shows that the numerical calculation is quite convenient for practical applications and provides sufficient accurate results.The comparison of numerical computation with the experimental data is shown in Fig. 5 and Figs. 7, 8. It is evident that the values calculated are in good agreement with the experimental data obtained by other researchers The various behaviours of cnoidal wave,including the relative heights of wave crest, the maximum velocity,wave energy flux, radiation stress and the variation of the mean water level after wave breaking, are discussed in this paper.  椭圆余弦波能很好地描述浅水区域波浪运动特性,尤其是波浪破碎后形成的击岸波水质点运动规律、波速及波面形态,但按以往的理论,因椭圆积分计算上的繁杂往往给应用带来不便。按本文的方法对椭圆余弦波进行数值求解具有方法简便、正确迅速、便于应用的优点;同时,文中探讨了椭圆余弦波的各种特性,包括相对波峰高度、底面最大流速、波速、波能流及辐射应力和波浪破碎后的平均水面变化值。计算表明,这一方法比较符合试验资料及实际情况。  By adhering the conventional strain gauges to a place sufficiently far from the crack tip, a method for determining the openmode StressIntensity Factor (SIF) K1 is developed in this paper. In fact, it is a combination method of the experimental results with the numerical way. The strain can be determined from experiments and expressed as the Williams series containing unknow coefficients, forming a series of algebraic linear equations. Solving those equations and with the relationship of unknow coefficiends... By adhering the conventional strain gauges to a place sufficiently far from the crack tip, a method for determining the openmode StressIntensity Factor (SIF) K1 is developed in this paper. In fact, it is a combination method of the experimental results with the numerical way. The strain can be determined from experiments and expressed as the Williams series containing unknow coefficients, forming a series of algebraic linear equations. Solving those equations and with the relationship of unknow coefficiends and the SIF, we can obtain K1. Because the strain gages are placed far from the plastic zone so as to avoid the high stress gradiant region at the vicinity of crack tips the determination is sufficient accurate. Inputting the strain values into the data processing equipment and computer, we can quickly obtain the K1 for a crack structure under loading condition. It is convenient to perform the destruction control to ensure the equipment running safely and reliably.  本文给出一种将常规电阻应变片贴在距裂纹尖端较远处测量Ⅰ型裂纹应力强度因子K_1的方法。此法实际上是一种实验法与数值法相结合的方法。用实验法测出应变,应变又可以用含待定系数的Williams级数表示,它们组成一组线性代数方程组。解此方程组,可获得待定系数,由待定系数与应力强度因子的已知关系,可求出K_1。 远场应变测量法,避开了裂纹尖端邻域应变梯度很大的区域和可能的塑性区,因而应变测量比较准确。 测出的应变输入数据处理设备及计算机就可以快速实时地知道含裂纹结构在承载情况的K_1,便于进行破坏控制,使设备安全而可靠的工作。   << 更多相关文摘 
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