固有频率

The study demonstrates that there are four ways to expand the bandwidth of servo control system of the electro-optical theodolite: 1 Improving the free vibrancy natural frequency of optical-electronic theodolite; 2 To compensate the structural syntony ; 3 Using electric current feedback; 4 Using acceleration and velocity feedback.

研究表明，提高光电经纬仪伺服控制系统带寛有4个途径：1）增大光电经纬仪固有频率；2）对结构谐振进行补偿；3）使用电流反馈；4）使用加速度和速度反馈等。

Mechanical model of the drill carriage with rotation and vibrating hammer for the new type taphole drill is established.

建立了新型开铁口机电动钻冲机构的力学模型，计算了它的固有频率和主振型。

In this method, the sensitivity is performed to find the design parameter. The approximation of natural frequencies is given by the Taylor expansion with respect to the design parameter.

该方法通过对结构进行敏感度分析，确定结构中最为敏感的参数，由泰勒展式给出结构的固有频率变化与敏感参数变化之间的近似对应关系。

New concept of active strain energy tuning is employed in order to tune the natural frequencies of the plate.

基于主动应变能调节的概念，可实现对板的固有频率的调整。

Through the model analysis on the structure of torpedo cars body with Block Lanczos method, the first fifteen natural frequency and vibration modes are calculated. Moreover, it also looks for the idiographic measures to boost up torpedo car against vibration by analyzing the reason for that.

运用分块Lanczos法对混铁车罐体结构进行了模态分析，得出了罐体的前15阶固有频率和振型；分析了引起混铁车罐体振动的原因，以寻求增强混铁车罐体抗振性能的具体措施。

Though establishing kinetic differential equation system and solving, the natural frequency, the angle displacement and torsional vibration force moment can be known.

烧结机驱动装置属半悬挂非对称型柔性传动，为利用动力学的观点分析解决设备故障问题，将系统简化为四质量系统力学模型，通过建立运动微分方程组并求解，可得到系统的固有频率、扭振的角位移和扭振力矩。

All assumptions for the method are come from the classical theory of the differential equations of motion of any studied element of a structure. Its dynamic stiffness matrix is the transcendental function of frequency. This transcendental eigenproblem can be solved efficiently by applying the well-known Williams-Wittrick algorithm.

该方法的所有假设仅来自于建立该单元运动微分方程的经典理论，所形成的动态刚度阵是固有频率的超越函数，解决这类超越特征值问题的有效方法是Williams-Wittrick算法。

The formulas for calculating natural frequency and vibration transmission ratio are given.

给出了钻柱轴向振动的固有频率和振动传输公式。

In many practice problems such as to know the resonnance frequency of a structure and to know the critical value for the stability of a dynamical system,often need to compute the eigenvalues of a symmetric matrix. The chief method to compute the eigenvalues of a symmetric matrix is first to transformate the matrix to a symmetric tridiagonal matrix similarly and orthogonally, then to use the QR method with shift to the symmetric tridiagonal matrix.

很多实际问题，如求结构振动的固有频率，动力系统稳定性的临界值等常常归结为计算对称矩阵的特征值，而首选的计算方法是先把该矩阵正交相似变换成一个对称三对角矩阵，再对这个对称三对角矩阵用带位移的QR方法。1968年J.H。

Then, a formula for calculating the frequencies is derived by variational method.

用变分法推导出该结构的固有频率计算公式。

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