模态

In this paper, an effective and practical procedure in time domain,the real mode-superposition method,is proposed.

本文给出一种有效而实用的时域解法———实模态叠加法，此外还介绍了复模态叠加法。

Sampling points were obtained by using optimal Latin hypercube design of experimental method,meantime,in order to improve computing efficiency,application of stepwise regression response surface approximate method in the MDO system of the vehicle crashworthiness and free mode of Body-In-White,the approximate model was optimized by using sequential quadratic programming method.

采用最优拉丁方试验设计方法进行样本数据设计，同时，为了提高计算效率，采用了一种新型的响应面构建方法——逐步回归响应面方法构建了整车耐撞性与白车身自由模态多学科系统的近似模型，利用序列二次规划优化方法对此近似模型进行优化，避免了整车碰撞传统优化设计方法计算量大，在碰撞非线性系统优化中常常易导致收敛缓慢甚至不收敛的缺点，在满足了CMVDR294安全法规的同时，使得白车身的扭转模态值得到提高，汽车重量得到较大程度的减轻。

Its improved form of three terms series including Rubin second-order approximate terms and their exact residual term is then obtained.

采用叠加法和删除保留模态法导出了自由界面精确剩余模态三项和公式，它在Rubin二级近似项上增加了精确余项，导出非线性精确综合方程，构造了具有超收敛性质的迭代求解方程。

The principle of piezoelectric modal sensor is introduced and the formulas of calculating modal respondence by measured piezoelectric outputs are gained.

介绍了压电模态传感器的实现原理，并给出了由实测压电单元输出得到结构模态响应的计算公式。

Inherent frequency characteristics of X2105C-1 diesel crankshaft are carried out by using ANSYS finite element method. The modal analysis includes retortion vibration, bending vibration and lognitudinal vibration.

对x2105C-l型柴油机曲轴在自由模态下的固有频率特性进行了有限元分析，所计算的模态包含了扭转振动、弯曲振动和纵向振动。

In this paper as an example of a typical large-span dome roof, the direct superposition method of Ritz vectors are used in the solution of the eigenvalue problem and the calculation of wind-induced response of the roofs.

大跨屋盖特徵值问题的求解是结构动力响应分析中最繁琐的一个环节，而且一些对结构响应贡献较大的高阶模态容易在传统的模态叠加法中被忽略。

Compared by the response obtained by the traditional mode superposition method, the direct superposition method of Ritz vectors yields more accurate results with fewer vectors and the contributions of higher modes are not overlooked.

与传统模态叠加法算得的结果相比，里兹向量直接叠加法只用很少数目的向量就可以得到较精确的结果，而且高阶模态的贡献不会被忽略。

In the analysis, a nonlinear wave vibration equation of the thin cylindrical shell including damping and items due to geometric nonlinearities was established and then transformed by Galerkin's method. With different combinations of modes different nonlinear differential equations in modal coordinates were obtained. The Runge Kutta method was used to solve the equations numerically and some features of nonlinear wave vibration were discussed.

在研究过程中，首先，考虑阻尼并引入几何非线性项，建立薄壁圆柱壳的非线性波动方程，然后，采用Galerkin方法对波动方程进行转换，选取不同的模态组合，得到相应模态坐标下的非线性微分方程，最后用Runge-Kutta法进行数值计算并对圆柱壳的非线性波动振动特性进行了分析。

Dual-Mode combustion chamber ,as the key component of the Scramjet, is the most difficult to design.

双模态燃烧室是双模态超燃冲压发动机中最关键的部件和设计难点。

Dynamic balancing; Vibration system; Flexure hinge; Instantaneous motion center; Plane separation; Force relation; Modal analysis; Empirical modal decomposition; Adaptive lattice notch filter; Phase difference correction

工程科技II，工业通用技术及设备，声学工程动平衡；振动系统；柔性铰链；瞬时运动中心；平面分离；关联效应；模态分析；经验模态分解；自适应陷波；相位差校正

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷