查询词典 vibration-proof

This paper set out from the high order shear deformation theory at first, and utilize the spline finite point method to set up a new dynamic model of piezoelectric intellectual plate. Secondly ,a corresponding MATLAB program is written according to the theory, and has analysed the deformation of the piezoelectric intellectual plate. In the end , this paper has analysed the vibration control of the piezoelectric intellectual plate. Some results are compared with the analytic values, and have proved the rationality of the results of this paper.

本文首先从高阶剪切变形理论出发，利用样条有限点法，建立了压电智能层合板新的动力模型；其次，利用MATLAB语言编写了相应的计算机程序，对压电智能层合板的变形进行了分析；最后分析了压电智能层合板振动控制问题；其中一部分结果与相应的解析解作了详细的比较，证明了本文结果的合理性。

Equation (4-198) yields a first approximation for the change in the natural frequency of vibration.

方程（4－198）给出了一级近似下的固有振动频率的改变量。

Equation(4-198) yields a first approximation for the change in the natural frequency of vibration.

方程（－98）出了一级近似下的固有振动频率的改变量。

Based on deformation assumption and Mindlin first order shear deformation theory, a finite element method was proposed for free vibration analysis of the composite sandwich plates with debonded damage along the face/core interface.

基于Zig-Zag变形假定和Mindlin一阶剪切理论，提出了具有面板和芯体开裂损伤复合材料夹层板自由振动的有限元分析方法。

The comprehensive track state managing method to reduce the rail cracks around the bolt holes is proposed based on the vehicle/track nonstationary random vibration analysis and the track transfer characteristic, and is further modified through the comprehensive dynamics experiment in a railway worksite and the rail strains analysis due to the rail-fishplate interaction and the compression of fishbolt to rail bolt hole.

基于轮轨非平稳随机振动分析和轨道动态传递特性研究结果，本文提出综合整治钢轨螺栓孔裂损的措施，并分析了钢轨鱼尾板联结和螺栓杆挤压造成的钢轨螺孔应变，结合现场轨道动力学试验，完善这些措施。

Generally,the best efficiency is obtained in second order vibration mode of the fishtail,and the reverse Karman Vortex Street wake is observed with corresponding frequency.

在一般情况下当外磁场以系统的二阶固有频率工作时其工作效率最佳。在此情况下鱼尾摆动产生了推力型反卡门涡街形态的尾迹涡流。

The blades are modeled as cantilever beams fixed on the disk. The equations of motion of the system are derived. The eigenvectors are obtained by solving the eigenvalues of the system and the localized modes of vibration in mistuned systems are further gotten.

采用固定在轮盘上的悬臂梁模型来模拟叶片，推导了结构系统的运动方程表达式，求解特征值问题获得了结构系统的特征向量，进而得到了失谐结构的局部化的振动模态。

The modal tests of PCB and PCB assembly (free boundary condition and fixed boundary condition) were carried out. The equivalent elastic modulus and damping parameters of PCB can be gained, and the fixed boundary condition of finite element model was also determined. These will help to the following work. Second, drop impact tests of three different heights were carried out. Strains and acceleration responses of PCB were measured. Failed BGA packages of different test conditions were dyeing, and cross section analysis of failed solder joints was conducted. It was found in our drop tests that the root cause of lead-free solder joints under drop impact was the combined effect of mechanical shock and PCB bending vibration.

针对JEDEC标准试件的局限性，提出了设计便于统计学研究焊点可靠性的试验试件的构想，利用有限元模态分析方法确定并验证了用圆形PCB组件替代JEDEC标准试件的可行性；通过一系列模态试验和有限元模态分析，确定了圆形PCB组件的相关试验参数，这不仅为跌落碰撞下PCB组件有限元模拟确定了较为合理准确的有限元模型，而且为正确地评价跌落碰撞下PCB组件的可靠性问题奠定了基础。

Since the standard sample and the sample have fixed positions, the error caused by platform jitter or other vibration in the scanning process can be simultaneously represented by the profile signals of the standard sample and the sample.

标准样品和样品位置固定，所以在扫描过程中，由于平台抖动或其他震动引起的误差会同时体现在标准样品和样品的形貌信号上。

Presents a torsional vibration model during the flameout of a cylinder with the system matrix method.

利用系统矩阵法建立了车辆动力传动系在发动机一缸熄火时的扭振数学模型。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。