For anisotropic materials in which this direction of coordinate z is an orthogonal direction of materials it is discovered that the orthogonality relationship of the system of dual vectors may be decomposed into two independent and symmetrical orthogonality subrelationships 对于z方向材料正交的各向异性材料，发现了对偶向量体系的正交关系可以分解为2个独立的、对称的子正交关系，新的正交关系包含对偶向量体系的正交关系。
The vibration signal is decomposed into several intrinsic mode functions ( imfs ) by emd , and the fault information is extracted from the imfs containing modulated signals , which then is effectively separated by emd , thereby the signal to noise ratio ( snr ) of diagnosis signal is improved obviously 首先，对复杂的振动信号进行经验模式分解，得到若干个基本模式分量，再对包含调制信号的基本式分量进行包络分析以提取故障信息。
Application of emd and wavelet transform to diagnosis machine fault in this paper a signal singularity detection method is introduced , with which the signal is decomposed into imfs ( intrinsic mode function ) by the emd ( empirical mode decomposition ) and the singularity of the imfs is extracted by the wavelet transform 利用emd方法和小波变换进行机械故障诊断本文采用经验模式分解( emd )与小波变换相结合的方法分析非平稳机械故障信号的奇异性，进行机械故障诊断。
In this approach , design tasks are decomposed into a system - level optimization and subsystem - level optimizations . the task of each subsystem optimization is to find the local variables to minimize or maximize objectives , subject to its local design constraints . the task of the system - level optimization is to find global ( or shared ) and auxiliary variables to optimize the system performances , and satisfy the consistency constraints 这种方法将优化流程分为系统级优化和单学科优化两个层次:系统级优化的任务是通过调整共享设计变量和辅助设计变量,在满足一致性约束条件下,使系统目标最优;子系统的任务是调整局部设计变量,在满足本学科的设计要求条件下,使子系统的目标最优。
The other is train communication network . based on the protocol of " iec 61375 - 1 " , published by iec in 1999 , the data to be transmitted is classified into urgent periodic variables and deferrable random messages . in this paper the whole net is decomposed into two layers : train bus and vehicle bus 文中参考iec组织1999年公布的“ iec61375 - 1 ”标准协议，将整个列车网络分为连接各个车厢主机的上层列车总线网和连接单个车厢内负责控制、检测等子设备的下层车厢总线网，同时将传输的数据类型区分为实时的周期性过程数据和可延迟的偶发性消息数据。
This article shows a new method to construct symmetric compacted orthogonal wavelet packet basis ： the original compacted orthogonal wavelet basis and scaling function are decomposed into symmetric and anti - symmetric parts respectively ， then we prove that three of four parts is also wavelet basis and another is scale function . we find it simple to process 1 - d signal . finally , by these results above , all the results above are applied to dsp 本文提出一种新的对称化方法，把一大类紧支集实值的非对称正交小波函数分解成对称和反对称两部分，并证明了其相应的两部分仍然构成对称和反对称的紧支正交小波基，而且我们发现尺度函数对称和反对称部分分别是某子空间的尺度函数和小波函数。
From the perspective of minimum transmission losses , an instantaneous reactive power theory for systems with any number of phases and with or without neutral line is developed . under the new definition , each quantity has its own physical meaning , and the zero sequence current can be decomposed into active and reactive components . furthermore , a generalized compensation method for zero sequence current is developed 从输电损耗最小的角度出发，提出了任意相无中性线或有中性线系统的瞬时无功功率理论，在新的理论下，每个量都有清晰的物理意义，且能分解出零序电流的有功分量和无功分量，并给出了通用的零序电流补偿方法，揭示了瞬时无功功率理论与传统平均意义下的无功功率理论的联系及本质区别，从而为研究hvdc - vsc及各种facts装置的无功功率控制奠定了理论基础。
In light of the limitation of fast fourier transform ( fft ) for the method of traditional spectrum analysis to analyze the unsteady signal , wavelet and wavelet analysis are made for the typical unsteady process signal of starting up and shut down with the good characteristic of simultaneous localization in both the time and the frequency domains based on the field test on the vibration of two - row placed units in lijiaxia hydropower station , in which the signal is decomposed into different frequency band , and then the weak signal is caught and the dominant frequency is picked up for the analysis of the vibration source 摘要基于李家峡水电站双排机组振动的现场试验研究，并且针对传统频谱分析方法傅立叶变换( fft )对于非平稳信号已力不从心这一缺陷，利用小波分析方法在时域和频域上同时具有良好的局部化性质，通过对开停机这一典型非平稳过程信号进行小波及小波包分析，将其分解到不同频带内，获取微弱信息和提取优势频率，并对其作振源分析，得出开停机初始时刻因水流不稳均出现强烈的振动现象，且低频段信号能量最大，开停机过程水流脉动压力和尾水涡带摆动是引起定子基础振动的主要原因。
Abstract : a new method , collaborative allocation ( ca ) , is proposed to solve the large - scale optimum allocation problem in aircraft conceptual design . according to the characteristics of optimum allocation in aircraft conceptual design . the principle and mathematical model of ca are established . the optimum allocation problem is decomposed into one main optimization problem and several sub - optimization problems . a group of design requirements for subsystems are provided by the main system respectively , and the subsystems execute their own optimizations or further provide the detailed design requirements to the bottom components of aircraft , such as spars , ribs and skins , etc . the subsystems minimize the discrepancy between their own local variables and the corresponding allocated values , and then return the optimization results to main optimization . the main optimization is performed to reallocate the design requirements for improving the integration performance and progressing toward the compatibilities among subsystems . ca provides the general optimum allocation architecture and is easy to be carried out . furthermore , the concurrent computation can also be realized . two examples of optimum reliability allocation are used to describe the implementation procedure of ca for two - level allocation and three - level allocation respectively , and to validate preliminarily its correctness and effectiveness . it is shown that the developed method can be successfully used in optimum allocation of design requirements . then taking weight requirement allocation as example , the mathematical model and solution procedure for collaborative allocation of design requirements in aircraft conceptual design are briefly depicted 文摘:探讨了一种新的设计指标最优分配方法- -协同分配法,用于处理飞机顶层设计中的大规模设计指标最优分配问题.分析了飞机顶层设计中的设计指标最优分配特征,据此给出了协同法的原理并建立了数学模型.协同法按设计指标分配关系将最优分配问题分解为主系统优化和子系统优化,主优化对子系统设计指标进行最优分配,子优化以最小化分配设计指标值与期望设计指标值之间的差异为目标,进行子系统最优设计,或对底层元件(如飞机翼梁、翼肋和翼盒等)进行设计指标最优分配,并把最优解信息反馈给主优化.主优化通过子优化最优解信息构成的一致性约束协调分配量,提高系统整体性能,并重新给出分配方案.主系统与子系统反复协调,直到得到设计指标最优分配方案.两层可靠度指标分配算例初步验证了本文方法的正确性与可行性,三层可靠度指标分配算例证明了本文方法的有效性.最后,以重量指标分配为例,简要叙述了针对飞机顶层设计中设计指标协同分配的数学模型和求解思路
And smooth and effective knowledge transfer and exchange are the prerequisite of interactive learning within enterprise cluster , and interactors ’ proximity - based coupling is the important guarantee in knowledge transferring and exchanging smoothly . actors ’ proximity may be decomposed into geographical , social and indus - trial aspects in network for cii within regional enterprise cluster 区域企业集群创新实质为耦合互动创新,这是因为区域企业集群创新的形成是集合主体交互学习合作竞争的结果,主体间交互学习的实现是以区域企业集群内顺畅而有效的知识转移和交流为前提的,而企业集群中主体间的接近性耦合是知识顺畅转移和交流的保证。
