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首页> 外文会议>AIAA Dynamics Specialists Conference, Apr 21-22, 1994, Hilton Head, SC >PROBABILISTIC AND DETERMINISTIC RESPONSE OF SHORT SPACER TRUSS WITH DEFECTIVE JOINTS AND IMPERFECT MEMBERS
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PROBABILISTIC AND DETERMINISTIC RESPONSE OF SHORT SPACER TRUSS WITH DEFECTIVE JOINTS AND IMPERFECT MEMBERS

机译：带有缺陷节点和不完善成员的短间隔桁架的概率和确定性响应

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摘要

A preliminary configuration of the Short Spacer Truss is analyzed to predict its deterministic and probabilistic response. The structure is considered to have a special type of joint defect and member initial imperfection. The special member end connection defect is created by considering only the global translation degrees of freedom of some selected member ends to be connected to those of the corresponding joints at which the member ends meet. The initial member imperfection is considered in terms of some members being initially bent or crooked. The initial bent shape of members is considered to be sinusoidal. The NASA Lewis Research Center (LeRC) finite element computational code, "Numerical Evaluation of Stochastic Structures under Stresses" (NESSUS), is used for the response determination. Results from the study include deterministic vibration frequencies, static displacements, and buckling loads. Cumulative probability levels and sensitivity factors are obtained for vibration frequencies, displacement, and buckling eigenvalues to delineate the effects of several geometric, loading, and material design variables on the response of the structure having the two special construction conditions. Results from both the deterministic and probabilistic studies show that a single special member end connection defect is found to have significant effects on vibration frequencies, especially the first mode. However, the deterministic results indicate that effects on displacements and buckling loads are observed to be small due to one end connection defect. Larger number of the member end connection defects have appreciable influence on the displacement. Effects of the initial member imperfection is observed to have small effects on the response. Results from the probabilistic analysis indicate that although overall cumulative probabilities of displacements and buckling loads change very slightly due to initial member imperfection, different design variables show greater level of sensitivity.
机译：分析了短间隔桁架的初步配置，以预测其确定性和概率性响应。该结构被认为具有特殊类型的关节缺陷和构件初始缺陷。通过仅考虑一些选定的要连接到成员端相遇的相应接头的全局端自由度来创建特殊的成员端连接缺陷。考虑到一些初始弯曲或弯曲的构件是初始缺陷。构件的初始弯曲形状被认为是正弦曲线。美国宇航局刘易斯研究中心（LeRC）有限元计算代码“应力作用下的随机结构的数值评估”（NESSUS）用于确定响应。研究的结果包括确定性的振动频率，静态位移和屈曲载荷。获得了振动频率，位移和屈曲特征值的累积概率水平和敏感度因子，以描述几个几何，载荷和材料设计变量对具有两种特殊构造条件的结构的响应的影响。确定性和概率研究的结果均表明，单个特殊构件端部连接缺陷被发现对振动频率具有显着影响，尤其是第一模式。但是，确定性结果表明，由于一个端部连接缺陷，对位移和屈曲载荷的影响很小。大量的构件端部连接缺陷对位移有明显影响。观察到初始成员缺陷的影响对响应的影响很小。概率分析的结果表明，尽管位移和屈曲载荷的总体累积概率由于初始构件的缺陷而变化很小，但不同的设计变量显示出更高的灵敏度。

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