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Chaos is a dynamic and species-random and nonlinear system, and it has sensitive initial conditions, continuous power spectrum and traversal, so it is often used to generate pseudo-random sequence.
由于混沌是一种动态的、类随机的非线性系统,且具有对初始条件敏感、连续的功率谱、各态遍历等特性,因此可产生伪随机序列。
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Based on the modem FEM with the dynamic substructure method, itd dynamic equation is established with almost no limits to DOFs of the system, in which the left side is the first approach of the nonlinear system and the right side is the excitation and coupling nonlinear pseudo forces. The modal analysis method is used to get the eigen solution to the reduced linear homogeneous dynamic differential equation. When the system is excited by the harmonic excitation at the right side of the equation, the nonlinear dynamic response can be calculated by the numerical method to give quantitative analysis.
基于近代有限元和子结构模态综合法的动力学建模方法,获得非线性系统动力学微分方程,其自由度几乎没有限制,对左端首次近似齐次方程进行模态分析,选取对响应有贡献的部分本征对,同样对右端激励和非线性伪力作模态变换,得到减缩后非线性系统耦合动力学微分方程。
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Also the response amplitude will be changed with the initial conditions due to the nonlinear properties of the cables.Taking the bending stiffness, cable sag and cable inclination into consideration, the space vibration control of the cables using the visco-elastic dampers in cable-stayed bridges is investigated by joining the center difference method and the state space strategy. Both the maximum modal damping ration and the optimal damper size are obtained, then the practical suggestions are proposed for the design of the dampers. The space nonlinear vibration equations of the cable-damper system are derived, and anew hybrid method for solving the cable-damper system is presented by combing the Newmark method and Pseudo-force technology. According to the known properties of the cable-damper system, the nonlinear transient responses are analyzed under all kinds of excitations. Based on the transient response, the control effectiveness of the visco-elastic dampers is further demonstrated.
综合考虑了拉索抗弯刚度、垂度的影响,研究了粘弹性阻尼器对斜拉桥拉索的空间振动控制,联合中心差分方法及状态空间法,得出了拉索面内、外振动各阶模态可能达到的最大阻尼比及相应的最优阻尼器系数,并对斜拉桥拉索的阻尼器设计提出了参考建议:考虑拉索抗弯刚度、垂度及几何非线性,导出了索-阻尼器系统的空间振动非线性方程组,结合Newmark方法及伪力(Pseudo-Force)方法,创新地提出了求解非线性方程组的杂交方法,根据拉索-阻尼器系统的阻尼特性,在各种荷载作用下,对索-阻尼器系统的非线性瞬态振动响应进行了研究,从系统响应的角度更加直接地验证了阻尼器的控制效果。
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Firstly, the random walk problem is introduced and the solution is schemed out theoretically. And then, the equivalent RC circuit for thermal analysis is discussed as the IC package is divided into many small blocks at the desired level of granularity. The techniques of analyzing the equivalent RC network by random walk algorithm are then discussed. At the same time, an equivalent model for thermal analysis is set up according to an IC chip. The proposed method is then applied to this model for both steady and transient analysis. Two speedup strategies, pseudo parallel walking and walk results reuse, are proposed sequentially to improve the algorithm performance.
首先简述随机行走问题的基本概念,给出问题的理论解法;然后讨论基于三维网格划分的IC芯片热等效阻容网络模型,着重分析随机行走算法在热等效模型中的应用,并建立一个实际芯片的热等效模型,采用随机行走算法模拟计算模型的稳态温度分布和瞬态温度变化;最后针对随机行走算法应用中的不足,提出了伪并行行走和结果重用2种加速技术。
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The research work presented in this dissertation cover the characteristics of Time Domain Transient Electromagnetic Field analysis method ,the particular analysis of Pseudospectral time-domain algorithm, the improved or hybrid algorithms of PSTD and it\'s application in high power ultra wide-band technology and photonic crystals design.
本文主要研究了时域瞬态电磁场计算方法的基本特性,对近年来出现的时域伪谱算法进行了详细地分析,提出了多种改进及混合算法,并研究了其在超宽带电磁脉冲技术、光子晶体结构分析等工程问题中的应用。
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And works created to be hypes like "Wu Guanzhong walking into 798","what is Li xianting evading?", etc. being confronted with these, we can hardly find any reflection or criticism of contemporary art, on the contrary, what we experience is the corrupted and self abandoned art.
面对这些行为或作品,我们丝毫未能感受当代艺术对于当代社会、人的精神的反思或批判,我们只能感到利益化的商业机制对于艺术的腐蚀以及艺术自甘堕落的&伪态化&。
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The numerical results of stationary and transient Green'sfunction for high-velocity surface-head wave on some selected crystals are comparedThrough the above analyse,it is indicate that the first arrival wave mode is thelongitudinal-wave head-wave,and its propagate velocity is equal to the groupvelocity of the longitudinal bulk wave alone the surface.Furthermore,this modedoes not have the Δv/v effect,i.e.,its velocity is the same no matter the surface isfree or metalized.
通过对表面激发的瞬态和稳态Green理论分析和数值计算,表明在压电晶体表面上实际上看到的最高速的最先到达的波动模式是纵波头波,它具有沿表面纵波的群速度,而且对压电晶体,它不具有Δv/v效应,即在自由表面和金属化表面其传播速度是一样的,而压电晶体表面波及伪表面波均存在Δv/v效应。
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The HHT is applied to array acoustic logging signal processing, and EMD is used to decompose the signal into several IMF, and then the smooth pseudo Wigner-Ville distribution is obtained.
将该方法应用于阵列声波测井信号处理上,对声波测井信号进行经验模态分解并得到各阶IMF,对IMF分量作平滑伪Wigner-Ville时频分布,通过分析得到干层与水层之间的差异。
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primitive type:(原生类型)
比如,原生类型(primitive type),定为瞬态(Transient)的类型,不可访问的类型(!Field#isAccessible()),没实现Cloneable接口的类型等等,都不具备clone条件. String等java定义的类型就不需要再深入clone了,这些属于没必要进行clone的情况. 但List类型等"容器"类是有必要clone的成员类型/此处为伪代码:将clone好的值(