| 1. | Wavelet numerical method for nonlinear random system
用于随机振动分析的小波数值方法 |
| 2. | Sensitivity of reliability in nonlinear random systems with independent failure modes
非线性随机系统的独立失效模式可靠性灵敏度 |
| 3. | A discrete non - linear random systems model and the self - turning regulator algorithm of non - linear structure
一种离散非线性随机系统模型及其自校正调节器 |
| 4. | The method we present here seems to be a new approach to dynamical response problems of non - linear random systems
应该说，西北一f业大学博}一学位论文这是研究随机非线性系统动力响应的一个新途径。 |
| 5. | This thesis is devoted to the evolutionary random response problems of linear random systems , and to the response problems of the random duffing system due to harmonic excitations
论文重点研究了线性随机系统在演变随机激励下的响应问题，和初步探索随机duffing方程在谐和激励下的一些非线性现象。 |
| 6. | By orthogonal polynomial approximation method , we first reduce the random system into its deterministic equivalent one , so the response problem of a random system can be transformed into that of a deterministic system
有关上述gegenbauer多项式方法在随机振动问题中的应用，现有文献中尚未见报道。上述三种方法都可以用于求解随机结构的演变随机均方响应问题。 |
| 7. | The numerical results show that the responses of the proposed approach are much close to the monte carlo solutions and that the time of calculation of equivalent random systems method is much less than that of the monte carlo
从计算结果可以看出本文解和monte - carlo模拟解十分吻合，而且计算时间相比monte - carlo法少很多。本文提出的等效随机系统分析法，原理清楚，方法简单，算例的精度较高，有望在处理非线性随机动力问题中得到较大发展。 |
| 8. | The work in this dissertation mainly consists of two parts . in the first part , the dynamic response of nonlinear structures with uncertain physical parameters is studied by means of subsection linearization method and equivalent random systems method , separately . in the second part , a method for analyzing the response of viscoelastic structures with uncertain physical parameters is proposed , with fem in space domain and discrete method in time domain
本文的研究工作主要由两个部分组成；第一部分是分别用分段线性化方法和等效随机系统方法对含随机参数非线性结构动态响应统计量的求解；第二部分是建立了用扩阶随机有限元方法求解含随机参数粘弹性问题的计算模型。 |
| 9. | Finally , the results are compared with periodic and random chains . then we studied acoustic wave propagation in 1d quasiperiodic and aperiodic systems by means of he transfer matrix . transmission rate , reflection rate , energy flow , logarithmic energy flow , energy density and lyapunov exponent are computed numerically , and compared with periodic and random system
其次研究了声波在几种一维准周期和非周期系统中的传播，通过转移矩阵的方法，数值地得到了系统的传播系数t _ n 、反射系数r _ n 、能流密度j _ n ，能量密度e _ n和lyapunov指数，给出了以上各量与传播长度n以及频率之间的关系，同时发现能流及能量密度都具有分形结构，并与周期和随机系统的结果作了比较。 |
| 10. | Many investigations show that randomicity of structures ? parameter will bring large value of stochastic dynamic response of structures . randomicity of structures ? mechanics parameter may be dominant factors . therefore , introduction of randomicity into system model of structure and using random system model are more reasonable than that of determinate system model
众多的研究工作表明，结构参数的随机变异性可以引起结构随机动力响应的大幅度涨落，结构力学参数的随机性还可能成为主导因素，在结构系统模型中引入随机性的概念，采用随机结构系统模型是较确定性结构系统模型更为合理的一种选择。 |
