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    3-D dynamic finite element method analysis confirms that the rise time and stress level of the stress impulse as well as the specimen diameter have a significant effect on the testing result of CCCD-SHPB(central cracked circular disk-split Hopkinson pressure bar)dynamic fracture test system,and the dynamic fracture toughness under different loading rates can be achieved by changing the rise time and stress level of the stress impulse.
    3维动态有限元分析结果表明,脉冲上升沿时间、幅值及试件直径对CCCD-SHPB(central cracked circular disk-split Hopkinson pressure bar)动态断裂试验系统的试验结果有较大影响,改变脉冲上升沿时间或脉冲幅值可以得到不同加载速率下材料的动态断裂韧度。
    Spectral-element direct numerical simulation was conducted for the wake flow with Re below 175 and the result agreed well with experimental data.
    运用直接数值模拟方法(谱元)对圆柱尾流(Re≤175)进行计算,计算结果与实验结果吻合良好。
    NUMERICAL ANALYSIS OF EFFECT OF STRESS IMPULSE ON TESTING RESULT FOR CCCD-SHPB DYNAMIC FRACTURE TEST SYSTEM
    应力脉冲对CCCD-SHPB试验系统测试结果影响的数值分析
    Numerical Analysis of Effect of Specimen's Geometric Size and Bar's Material on Testing Result for CCCD-SHPB Dynamic Fracture Test System
    试件几何尺寸和杆材对CCCD-SHPB试验系统测试结果影响的数值分析
    In 1996, S. Klainerman and T. C. Sideris [23] showed the same result by applying energy estimates and Klainerman-Sobolev inequalities.
    1996年,S.Klainerman和T.C.Sideris利用能量估计和Klainerman-Sobolev不等式证明了相同的结果
    The critical energy as the equivalence ratio (j)=2 was much more than that as =1. This result was consistent with the experimental one in gas detonation.
    当量比φ=2时所需的点火能量比φ=1时所需的点火能量大得多。 这一点,两相爆轰与气体中的爆轰点火能量的实验结果是一致的。
    The simulation result shows that the low-order model obtained by using mode norms, which keeps relatively important modes, is the better approximation of the original system than that of direct mode truncation, and is helpful to suppress the vibration of structures better.
    仿真结果表明,随着压电作动器的配置不同,结构的降阶模型中应保留的模态也应随之发生变化,利用所提出的方法获得的降阶模型保留了相对较重要的模态,它比直接模态截断方法更逼近原系统,是一种适用于结构全局振动控制的模型降阶方法;
    Two examples are tested successfully, the optimizing result tally better with the theory.
    对两个实例成功地进行了形状优化,所得优化结果与理论有很好的吻合。
    Then the influence of different characteristic of structure and earthquake on pushover evaluating result was analyzed. It was demonstrated that different structural and earthquake characteristic had different influence on the results of pushover analysis method.
    分析结果表明,不同结构特性、地震动特性对pushover法的计算结果具有不同的影响,其中结构自振周期对pushover法的应用准确性具有重要影响,结构形式和单元恢复力滞回模型对pushover法计算结果的影响较小,地震加速度峰值和场地特征周期具有一定的影响,而竖向地震动的影响则较小。
    Based on the result of FEM, dynamic stress intensity factor of three-point bending specimen is computed by approximate formulas. When specimen is loaded by regular impact loading, for example linear and sine loading, the results are consistent with that by FEM.
    结合有限元计算,比较分析了近似公式计算冲击载荷下三点弯曲试样的动态应力强度因子,结果表明对于规则函数形式(线性和正弦)的冲击载荷,不同方法得到的动态应力强度因子曲线吻合得比较好。
    In recent years, with the development of CFD(Computational Fluid Dynamics) it has become an important research direction to use CFD to study the mechanism of the flow in the pump and then optimize the design with the simulation result.
    近年来,随着计算流体力学(CFD)的发展,从研究离心泵流体流动机理出发,使用数值仿真研究离心泵内部流动,利用数值仿真结果来指导泵的设计已经成为重要的研究方向。
    This proves result of finite element simulation is credible;
    这证明用有限元模拟压痕实验的结果是非常可靠的;
    First, experimental result validated the hard-sphere model and soft- sphere model.
    在对球形粒子沉降的研究中,首先采用硬球碰撞模型和软球解析模型进行模拟,得到的结果与实验非常吻合,从而验证了两种模型的可行性。
    In this paper, it is a attempt that the dynamic analysis of structures is carried out against this low frequency part with lesser sampling points of wavelet decomposition, then data, and the results are compared with dynamic computation using the original earthquake record and result to multiple time-step length directly.
    所以本文尝试把由小波分解得到的采样点较少的低频部分用于结构的动力学计算,然后对所得数据进行不同重构处理,并把结果与使用原始地震纪录的动力学计算,以及直接成倍扩大时间步长的计算结果进行比较。 试图找到在各种情况下,既能根据需要尽可能多地减少计算量,精度又符合要求的数据处理方法。
    The result is satisfactory.
    结果是满意的。
    result is similar to that given by Grady.
    这个结果和Grady所给出的相似。
    When the shear rigidity C→∞, the result in this paper is coincided with the result of [5].
    当板的剪切刚度C→∞时,本文结果结果相一致。
    The result shows that the frequency of the beam is effected by the different combination of initial deflection and initial pressure.
    结果表明:初压力和初偏移的不同组合,能够影响梁非线性振动的频率.
    The result shows that this influence can be ignored under certain conditions.
    结果表明,在某些条件下这种影响可以忽略。
    The result shows that there is singularity of ln(A/r) for the strain field.
    结果表明,应变场具有ln(A/r)的奇异性。
 

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