固有频率

The paper establishes the 3D finite element model of a lathe-bed and calculates the result of vibration mode l analysis of it in ANSYS.

本文建立了某型立铣床床身的三维有限元模型，并利用大型有限元分析软件ANSYS进行了模态分析，得出了床身前十阶固有频率和振型。

The dynamic performances of the machine-body crossbeam are analyzed in theory. Previous five steps nature frequency and the mode shape of vibration of the machine-body can be solved.

对床身大梁的动态特性在理论上进行了分析，求出了床身大梁的前五阶固有频率和振型。

Secondly,a comparison is made between the results of three-dimension and one-dimension model of four full scale ships, based on which the modifiability of shear lag was put forward and it is proved that the modified coefficient is valid for 110,000t tanker.

然后通过用一维梁有限元方法对四条实船进行计算，和已有的三维有限元方法固有频率计算结果进行统计分析，提出了对一维梁有限元计算方法中剪切影响的修正，并用110000t油轮进行了验证。

The testing and research can provide reference for the design and optimization of woodworking mortise milling cutters.

对木工榫槽铣刀固有频率的测试研究可为木工榫槽铣刀设计与优化提供借鉴。

The equation to calculate natural frequency and the expression of dynamic response have been built, and the digit characteristics of natural frequency random variable and dynamic response are derived.

推导出了求解随机参数链式结构动力特性的方程式和随机参数链式结构动力响应的计算表达式，并推导了结构固有频率和动力响应随机变量的数字特征计算表达式。

Mode analysis ,Shaking types , Natural frequencies , Dynamics equation

模态分析；振动模型；固有频率；动力学方程

The relationship of the natural frequency and design parameters of the parallel mechanism were studied.

分析了柔性并联机构系统的固有频率与设计参数的关系。

Finally, a floating raft system model is presented, and the natural frequency is computed and analyzed.

最后，以浮筏系统模型为实例，进行系统建模和整个系统的固有频率计算和分析。

The natural frequency of water varies with temperature, pressure, minerals present, pH and other factors.

水的固有频率要受到温度、气压、含有的矿物、pH值等因素的影响。

It is shown that the method is convenient and feasible for the natural frequency estimation of frame structures in series.

结论表明，该方法对于框架串联结构的固有频率估算是方便且可行的。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐