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This paper attempts to construct a new theory on urban consumptive spatial structures.

本文主要目的在於尝试一个新的都市消费空间结构理论。

This approach was to replace the derivative operator in the continuous time model by an approximation and estimation of the physical parameters of structures by the least-squares method.

讨论了导数近似值的选择方法，并分析了算法的收敛性。

The results show that the frequency characteristic corresponds with vortex structures; the detail and approximate characteristics of signal are reflected by wavelet coefficient at different scales; the coefficient map of continuous wavelet transformation reveals the self-similarity of the signal.

采用傅里叶变换和小波变换技术，实现了混合层密度脉动信号的频谱与多分辨率分析，结果表明：信号的频域特性与流场的涡结构相对应，不同层面的离散小波系数反映了不同尺度下信号与图像的细节和平滑近似特征，连续小波变换系数图定性的反映了信号的自相似特征。

Firstly, this paper investigated roundly the basic theory of the ambient vibration method, analyzed systematically the main methods of ambient vibration identification, and discussed their advantages and disadvantages. Then we established the finite element model of structural dynamics and test model and analyzed their mutual relation, improved MUSIC method and correlation function method in the harmonic identification, and gave the subspace method and correlation function method based on continuous model, which is multi-harmonic retrieve technique. And then, this paper also puts forward least-squares method to estimate directly structural physical and modal parameters; this approach replaced the derivative operator in the continuous time model with an equivalent approximation, and estimated the physical parameters of structures by the least-squares method. And then, we discussed the approximation methods of derivative and their convergence. Finally, this paper researched the modal parameters of a frame structure by the simulation and test. The results demonstrated that subspace method, correlation function method and the least-squares method are effective and stable respectively.

全面地研究环境振动识别方法的基本理论，系统地分析环境振动识别方法的主要方法，讨论它们的优点和不足；建立结(来源：6666AB44C论文网www.abclunwen.com)构动力学的有限元模型和试验模型，分析有限元模型与试验模型之间的相互关系；改进谐波识别中的MUSIC识别方法和相关函数识别方法，给出大型结构模态识别的连续型的子空间分解识别方法和相关函数识别方法，这个方法是多元谐波识别方法；提出直接识别结构的物理参数和模态参数的最小二乘方法，这个方法利用导数的近似值代替导数值，并运用最小二乘方法识别结构的物理参数，讨论导数近似值的选择方法，分析算法的收敛性；通过仿真计算和模型实验，研究高层框架结构的模态参数识别，验证子空间分解识别方法、相关函数识别方法和最小二乘识别方法的有效性，算法的稳定性；从理论和试验两个方面分析和研究噪声对识别精度的影响，影响识别精度的因素，以及部分模态成分的模态参数不能够被识别的原因。

Modern project structures are proceeding at the direction of maximization, complication, automation and continuousness.

摘要现代工程结构正在向大型化、复杂化、自动化、连续化方向发展，复杂的服役环境使结构的运行安全受到威胁。

The ICM method based on this thesis, the topology optimization problem of continuum structures is solved.

本文主要工作内容是：(1)利用高阶缩并方法对广义几何规划问题求解。

You can now anchor structures that only require power while the control tower is in reinforced mode.

现在，只要有足够的能量栅格，你甚至可以在控制塔处于增强模式下锚定建筑。

In order to meet the market requirement, the company has paid much more attention to technical innovation and investment in recent years, so that our products have developed from original eight types (0, 2, 3, 4, 6, 7, 8, 9) in early times when the company was established, into multiple series, nearly 100 types of structures and more than 2000 specifications with exterior dimension ranging from 100mm to 1800mm, as well as the self-lubricating joints, inch-size conus, slewing rings and split bearing, etc.

为了满足市场需求，公司加大了技术改造力度和资金投入，一年一大步，一年一个新台阶，由建厂初期生产 0 、 2 、 3 、 4 、 6 、 7 、 8 、 9 八大类型发展到多系列近百种结构外径尺寸为 100mm-1800mm 的 2000 多个规格及自润滑关节、英制圆锥、回转支承、剖分轴承等等。

Focusing on practical application, finite element simulation technology was discussed for engineering structures applied with combined temperature and vibration environment, including solution of temperature field with convectional boundary condition, thermal stress computation, forming of prestress stiffness matrix, analysis of response power spectrum et al.

从工程应用的角度，探讨温度与随机振动载荷作用下结构动态响应的有限元分析技术，包括对流边界条件下温度场的求解、热应力计算、预应力刚度矩阵的建立、响应功率谱分析等。

This renewal has led to a diversity of life-styles and structures in the concept of convents and convent living.

这延续已经导致了不同的生活方式和结构的概念，修道院和修道院的生活。

"The operators will suffer a temporary decrease in the number of consumers and short message services as people may not like having to provide their ID cards for a phone number," Xu Junqi, vice-dean with the Policy-Making Institute of the Telecommunications Research Centre under MII, said yesterday.

信息产业部下属的通信决策研究院副主任徐俊其昨天说：&实行手机实名制后，人们可能不太情愿用身份证注册手机号，所以通信运营商会暂时面临用户减少和短信用户减少的问题。&

I don't believe in make-believe!

我不相信这些虚构的故事。