Results indicate that although established program uses traditional vibration solution, from the point of view of dams " dynamic stability analysis during earthquakes, its solution and boundaries treatment are feasible and can meet needs of practical projects 计算结果表明,原有程序虽然采用的是结构分析中的振动解法,但从土坝地震稳定性分析角度而言,原来程序的算法及边界处理是可行的,可以满足实际工程的需要。
According to these situations, this dissertation brings forward an integrated analysis method and control strategy in oscillation research, which can be applied to prompt the level of dynamic stability analysis and provide the solution for real system 本文根据电力系统发展的特点和实际系统需要,提出了一整套针对低频振荡问题的综合分析方法和智能控制策略,对提高动态稳定分析水平、解决实际系统出现的问题,具有一定的参考价值。
Criteria for the nonlinear dynamic stability of rotative vehicles are derived by the liapunov's first method and the routh-hurwitz stability criterion, this criteria can be applied to the dynamic stability analysis of controlled rotative missiles, projectiles and rockets 应用李亚普诺夫第一近似理论和劳斯霍尔维茨方法导出了旋转飞行器的非线性运动稳定性判据,这个判据可应用于有控旋转导弹的运动稳定性分析,也可应用到炮弹和火箭弹上。
Applying the tool of the wavelet theory, the complex loading signal was composed to the simple loading signal and was used in dynamic stability analysis . it was shown that there were catastrophe skip phenomena and repetitive instability phenomena in the analysis of the dynamic stability of the gerdesker doom latticed shell 应用小波理论将复杂荷载信号变成简单荷载信号并应用于结构的动力稳定性分析,通过对歌德斯克穹顶网壳结构的动力稳定性分析表明,该结构发生动力失稳时具有突变的跳跃现象,并伴有多次动力失稳发生。
The main task of management center is to receive real time data of network from ems, to carry out dynamic stability analysis on forecasting faults, to determine stability control strategies, to modify and generate stability control strategy tables in every main station, and transmit the strategy tables to all sub-stations 管理中心的主要任务是接收ems电网实时数据,对电网预想事故进行动态安全分析,确定安全稳定控制策略,协调、修改并形成各区域主站及子站的安全稳定控制策略表,下发策略表到各主站。
According to the research development of flow-induced gate vibration in recent years, the paper presents a retrospect and a summary on the relationship between hydrodynamic loads and gate vibration characteristics, the hydrodynamic load characteristics and controlling means, the optimum design methods for gate anti-vibration, the dynamic stability analysis of the radial gate's arm, the methods to simulate the gate's hydro-elastic vibration, as well as the simulation analysis of flow-induced gate vibration 摘要从水动力荷载与闸门振动特性的关系、水动力荷载作用特点及其控制方法、闸门减振优化设计方法、弧形闸门支臂动力稳定性分析、闸门水弹性振动模拟方法以及闸门流激振动仿真分析等方面,对水工闸门流激振动的研究进行了回顾。
The fem program dsa ( dynamic stability analysis ) developed on the basis of the dynamic stability theory, the basic theory of spectrum analysis and the fast fourier transform ( fft ) algorithm is introduced . the spectral analyses of three earthquake waves are made using fft algorithm . all the process is realized by programming in matlab5.3 介绍了本人基于动力稳定理论编制的有限元程序dsa;然后阐述了频谱分析的基础理论和快速傅利叶变换(fft)算法,并以fft为基础,基于matlab5.3编制了对某地震波进行频谱分析的计算程序,并对三个地震波进行了频谱分析。
The dynamic stability analysis for parachute recovery system of manned spacecraft during recovery and landing process is carried out . two involved dynamic models and equations of motion are depicted, some valuable conclusions are obtained through numerical simulation calculations and analysis 对载人飞船回收系统在回收着陆过程中的动稳定性进行了分析,给出了在降落伞充气和全张满工作阶段两种不同动力学模型和运动方程,通过数值仿真计算和分析,得到了一些有价值的结论。
In a word, the works of this paper is as follows : 1, about the stability analysis of bridge foundation, the variational kp method is researched . at the same time, an improved method that not only keeps the merits of the former method, but also improves the precision and extends the range is putted forward . at the basis of pointing out the phenomena of sloping surface moving when the loading, structural boundary or hydrology and geology conditions changes, the dynamic stability analysis to considering the moving of sloping surface is putted forwarded 本文主要在以下几个方面开展研究工作:1、在大型桥梁地基基础的稳定性分析方面,对非线性有限元求解方法?变k_p法进行了研究,在保持原有方法优点的同时,提出了一种改进方法,可以提高该方法的求解精度与适用范围;在指出最不利滑动面会在荷载、结构边界、水文地质条件等发生变化时发生迁移现象的基础上,提出了基于最不利滑移面迁移的稳定性动态分析方法。
Recurring to pre-process program of ansys and drawing functions of winsurf, pre-process program serving to finite elements auto-division of dam bodies and basements models and post-process program capable of plotting various isolines of stress and dams " distortion are worked out . collecting program of data files necessary for dams " dynamic stability analysis is also finished 借助于ansys前处理程序和winsurf绘图功能,用vb6.0语言编制了用于进行坝体?坝基模型有限元网格自动划分的前处理程序和能够绘制各种应力等值线或坝体变形图的后处理程序;编制了进行土石坝地震稳定性分析所需要的数据文件集成程序。