结构-设备体系动力相互作用研究

通过结构－设备等价体系频域传递函数的比较分析，讨论了结构－设备动力相互作用对结构绝对动力反应与相对动力反应的影响。着重指出，这种影响是增大还是减小结构的动力反应取决于地震动频谱特性与结构、设备固有频率及质量比的关系。提出了利用场地土卓越周期判定上述影响的简便方法。     

EPSW在等高线绘制中的应用

本文主要论述大比例尺数字测图中等高线测绘的外业数据采集、内业编辑成图方法和值得注意问题进行探讨。供大家作业时参考。     

随机结构动力可靠度分析的极值概率密度方法

提出了随机结构动力可靠度分析的极值概率密度方法。基于概率密度演化的基本思想,构造一个虚拟随机过程,使得随机结构动力反应的极值为该虚拟随机过程的截口随机变量。进而．采用概率密度演化方法,建立概率密度演化方程并求解给出随机结构动力反应的极值分布。在安全域内积分即可给出结构动力可靠度,当安全界限为随机变量时,采用这一方法几乎不增加额外的工作量,与随机模拟结果的比较表明,本文建议方法具有良好的精度和效率。     

An Inverse Analysis of the Comprehensive Medium Parameters and a Simulation of the Crustal Deformation of the Qinghai-Tibet Plateau

sedonthetheoryoffiniteelementanalysis,aninverseanalysismodelforthecomprehensivemediumparametersoftheQinghai-TibetPlateauissetup.WiththehelpofGPSvelocityfield,thecomprehensivecrustalmediumparametersoftheplateauareinverselyanalyzedandthecharacteristicsoftherelatedmovementmacroscopicallysimulated.ItisthenconcludedthatthetectonicdeformationoftheplateauismainlyintheformofaN-ScompressionaccompaniedbyanE-Wstretching,andthepresenttectonicsettingoftheplateaushouldbetheresultofthecollisionbetweentheIndianandtheEurasiancontinentsduringtheCenozoic.     

青藏公路多年冻土区预警系统研究

在全球气候转暖和人类活动影响下,使多年冻土地区公路工程地质产生了新的变化。为了研究这些变化对公路路基稳定性的影响,展开长期的预警观测研究,本文引入模糊数学理论,从影响多年冻土区公路路基病害的因素中选择冻土年平均地温、冻土类型（冻土含冰量）、人为上限的变化、路基排水状况、特殊措施调控效果等关键因子,建立其语言变量及模糊隶属度函数,并综合历年来病害调查研究成果,总结病害的形成机理和专家经验,形成37条由语言变量描述的路基病害影响因子与病害严重程度之间关系的逻辑规则。运用Matlab模糊逻辑工具箱建立青藏公路多年冻土区预警系统。     

Extreme value distribution and reliability of nonlinear stochastic structures

A new approach to evaluate the extreme value distribution （EVD） of the response and reliability of general multi-DOF nonlinear stochastic structures is proposed. The approach is based on the recently developed probability density evolution method, which enables the instantaneous probability density functions of the stochastic responses to be captured. In the proposed method, a virtual stochastic process is first constructed to satisfy the condition that the extreme value of the response equals the value of the constructed process at a certain instant of time. The probability density evolution method is then applied to evaluate the instantaneous probability density function of the response, yielding the EVD. The reliability is therefore available through a simple integration over the safe domain. A numerical algorithm is developed using the Number Theoretical Method to select the discretized representative points. Further, a hyper-ball is imposed to sieve the points from the preceding point set in the hypercube. In the numerical examples, the EVD of random variables is evaluated and compared with the analytical solution. A frame structure is analyzed to capture the EVD of the response and the dynamic reliability. The investigations indicate that the proposed approach provides reasonable accuracy and efficiency.     

基于国产ARM架构CPU的导航卫星精密定轨解算效率优化方法

以国产飞腾CPU为例,讨论在国产ARM架构CPU基础上的导航卫星精密定轨解算效率优化方法。基于导航卫星精密定轨解算流程中钟差约化和法方程求逆耗时较多,分别利用多线程和OpenBlas对上述2个过程进行优化。结果表明,优化后解算效率大幅提升。钟差约化方面,采用100个测站32颗导航卫星进行解算时,原始单历元平均耗时1.105 s,优化后为0.188 s;法方程求逆方面,原始求逆平均耗时2 264 s,优化后仅需78 s。