模态系统

A sufficient condition is proposed for robust asymptotic stability of the autonomic system in terms of linear matrix inequality.

基于线性矩阵不等式的方法推导了该系统鲁棒渐近稳定的充分条件，并给出了系统状态反馈镇定器和理想滑动模态存在的充分条件。

Modal analysis of an acoustic system can determine its natural frequency and show the distribution of the acoustic quantities in space, give the knowledge about the way that the acoustic system responses are affected when changes are made in the excitation sources or in the domain geometry, and provide valuable information for the noise control of closed three-dimension domain.

通过对声学系统的模态分析，可以得到其固有频率以及在此频率下声学量在声场空间上的分布，了解到声源及声场空间几何参数的变化对声学系统的相应的影响，为三维封闭空间的噪声控制提供了依据。

By transforming the nonlinear saturation constraint into the special linear constraint, the problem of solving the feedback controller with saturated actuator is converted to the design of controller with linear constraint. The stochastic stability is ensured by using the intersection of ellipsoid invariant set of different modes existing in the attraction domain of the closed loop system. In this case, solving controllers can be equivalent to a solvability problem of linear matrix inequalities.

通过将非线性饱和约束转化为特殊的线性约束，使具有饱和执行器的控制器求解问题转化为线性约束控制器的求解问题，利用位于闭环系统吸引域内的不同模态下椭圆不变集的交集来保证系统的随机稳定性，此时控制器的求解可等效为线性矩阵不等式的可解性问题。

of the mistuning effects on thedynamics of the bladed disk are summarized. The bladed disk assemblies are cyclic symmetry structures.

谐调叶盘系统为循环对称结构，而失谐的存在破坏了这种循环对称性，并造成叶盘系统模态的局部化现象。

The guidance system is built according to the relative relationship in three dimensions. For longitudinal plane, by introducing the subsidiary smooth function, the attraction domain of sliding mode are analyzed and determined, and the stability of the guidance system is proven, considering from the coupling relations of two planes in three dimensions.

根据末端三维弹目相对运动学关系，建立了三维制导系统的数学模型，并以纵向平面模型和变结构控制中到达条件为基础，引入分段光滑连续函数，以三维平面间的耦合关系为出发点，从两个方面分析并确定了过载受限变结构制导律的滑动模态吸引区，证明其制导系统的稳定性。

Therefore, the in-depth research on the process of dynamic loads when braking ,the analysis about the causation and influence factor of the dynamic loads" emergence is necessary to the design of the circumgyrate machinery Aim at above problems, this text treats the portal crane"s boom system as a research object ,using finite element analysis and mechanism kinetics as theories foundation and analysis means ,utilizing ANSYS8.1 to research the dynamic effect of the crane boom under the circumstance of braking.

针对以上问题，本文以MQ4033门座起重机臂架系统为研究对象，以有限元和机械动力学为理论基础，运用ANSYS8.1对臂架系统在回转制动时的工况进行动力学分析，获得了臂架系统的模态特征以及在回转制动时的动力响应。

In general, the major results are:(1) Established the geometrical model for the enwinding of the wire rope in the roller, such as the inclination of the wire rope and the climbing equation of roller in the commutation process;(2) Established the tensile force kinetic model for the enwinding wire rope used the Lagrange kinetic equation and the continual kinetic theory in the start up and retard moment. Solved the equations by the method of modal analysis and separation of variables(3) Based on the analysis on the enwinding mechanism of the wire rope, we did the research on the mechanics behavior of the wire ropes enwinding process.(4) According to the research above, we made the computer program to solve the mechanics models. And after parametric analysis, we made the suggestion for the improving of the current wire rope enwinding system.

主要研究工作有：(1)建立了钢丝绳在滚筒缠绕几何模型，研究了钢丝绳缠绕过程极限偏角及换向过程在滚筒爬坡机理及几何模型；(2)依据LAGRANGE系统广义动力学方程、连续体动力学理论分别建立起升系统启动及制动过程钢丝绳缠绕快绳拉力的动力学模型，并分别采用模态分析法及分离变量法求解；(3)结合对钢丝绳在钻机滚筒缠绕机理分析的基础上，研究了钢丝绳在滚筒缠绕过程力学行为；(4)编制计算机仿真程序对上述模型进行求解，在参数分析的基础上提出对目前钢丝绳缠绕系统结构改进建议。

The I/O linearization method is applied to solve the mismatching problem of nonlinear perturbations in the system.

根据电堆温度机理模型，我们提出了变结构控制系统设计方案，快速平滑趋近律和快速收敛滑动模态被设计用来削弱抖振对系统的影响，并采用输入/输出线性化方法来解决系统中的摄动非匹配问题。

The dynamics equation is established using Lagrange method, and the formula of free frequency is deduced according to modality analysis of general viscous damp. Instantaneous wallops are applied to X, Z dimension respectively, observing the movement of the moving platform, and use ADAMS software to validate the free frequency of the system.

采用Lagrange方程建立了系统动力学方程，根据一般粘性阻尼系统的模态分析法，推导了求解固有振型的公式；分别在X、Z方向上施加一定的瞬时冲击力，观察动平台的运动情况，并采用ADAMS软件验证系统的固有频率。

In the present study, the effect of centrifugal force was investigated by three dimensional finite element analyses; the vibration characters of random mistuned blade-disc were also being investigated by probability methods and the Young's modulus of material of all blades are regarded as random parameters.

结果表明，离心力对失调叶片轮盘系统局部化振动有减弱作用；所有叶片弹性模量在5%误差范围的随机失调系统，其固有频率与非失调相差很小，即失调叶片—轮盘系统可以按照循环对称结构进行模态分析。

They weren't aggressive, but I yelled and threw a rock in their direction to get them off the trail and away from me, just in case.

他们没有侵略性，但我大喊，并在他们的方向扔石头让他们过的线索，远离我，以防万一。

In slot 2 in your bag put wrapping paper, quantity does not matter in this case.

在你的书包里槽2把包装纸、数量无关紧要。