振动型

With a model ZJ15 rig substructure as antetype, and according to similarity theory, the design of a substructure model is accomplished on the basis of detailed analysis of vibration data of ZJ15 rig substructures and fully consideration of test purposes.

在详细分析现役 ZJ15型钻机底座振动测试数据及充分考虑试验目的的基础上，以一种 ZJ15型钻机底座为原型，按照相似理论求出各个相似常数并设计出钻机底座模型，以便进行多种模态试验和振动模拟试验。

The results show that as the wind is along one leg of the model, the vibrations which are mainly caused by turbulence of oncoming flow are weak, and as the wind is along the angular bisector of two legs, the vibrations induced by vortex are strong.

实验结果表明：当风向顺Y型柱体某一肢时主要是来流脉动引起柱体较弱横向振动；当风向顺Y型柱体两肢分角线时则由涡脱落而引起柱体强烈的横向振动。

Because any reports on the active control of rotating disk haven't be seen in China up to now, and this experiment research is important, so the complete set of active control system of rotating disk are built independently. The push-pull type electromagnet is applied to control the vibration of the circular disk. The power amplifier circuit that can respond to wide scope in frequency from DC to AC is designed by improving the existing circuit. The sensor signal is first low-pass filtered, then the proportional control plus the differential control circuit easy used in practice are applied to finish the more effective control. The electromagnetism shield is used as possible to decrease the signal disturbance from the electromagnet to eddy sensor.

考虑到目前国内尚未见到有关旋转圆盘振动主动控制的相关报导以及实验的重要性，自行设计制作了一整套旋转圆盘振动主动控制系统：提出并采用推拉型电磁作动器来控制圆盘的振动；在改进现有电路的基础上，自行设计了具有较理想特性的驱动电磁作动器的功率放大器；根据实际控制环境的特点，设计了先进行低通滤波，再采用比例和实用的近似微分电路构成的控制器，并采用了电磁屏蔽来减小电磁铁对传感器的干扰，以实现更有效的控制。

The modal test results about empty electrodynamic vibration shaker is used in the finite element model of frequency and vibration mode amendment.

对某型电动振动台进行了有限元建模，详细阐述了建模方法，并利用振动台空台的模态试验结果对有限元模型进行了频率、振型修正。

Firstly, the function sinx that appears in the simple pendulum equation is replaced with a polynomial of degree 3 using Maclaurin series expansion and Chebyshev polynomial approximation. Subsequently, the resulting equation which is a Duffing type equation is approximately solved with combing Newton's method and the harmonic balance method.

首先，利用Maclaurin展开和Chebyshev多项式加速技术将单摆振动方程中的正弦型恢复力用三次多项式近似代替，得到一个Duffing型方程；然后，将牛顿法与谐波平衡法结合起来建立Duffing方程的解析逼近周期及周期解，从而给出单摆振动的解析逼近解。

Aimed at the mathematic problem in the model of the pendulum oscillation,the paper introduces the study on the existence of odd-harmonic solutions to second order semi-linear differential equation which describes the model of the pendulum oscillation by using upper and lower solution method monotone iterative technique and the Schauder fixed point theorem respectively.

针对摆型振动模型中的数学问题，分别采用上下解方法、单调迭代法及Schauder不动点定理研究了摆型振动模型的二阶半线性微分方程奇调和解的存在性。

Research shows turning round vibration is the main vibration shape of system of direct empty cold construction, should consider fan of; of vibration shape coupling many a little bit the structural vibration that syntonic drive causes is answered lesser, movement of fan low frequency is more than the influence of high frequency movement to the structure to structural influence.

探究表明扭转振动是直接空冷结构体系的主要振型，应该考虑振型耦合；风机多点谐振激励引起的结构振动响应较小，风机低频运转对结构的影响大于高频运转对结构的影响。

AWG, DIAMETER 12,34mm Tension joints Repair sleeves Vibration dampers, Stockbridge type Vibration dampers, loop type Complete Suspension Assemblies, including electrical connection to tower body, dwg Complete Dead End Assemblies, including electrical connection to tower body, dwg.

6特设工作组，直径12，34毫米张力关节修复袖子振动阻尼器，斯托克型振动阻尼器，环型全部中止大会，包括电气连接，以塔体， DWG格式完成死胡同大会，包括电气连接，以塔体， DWG格式。

It was established in 1980, registered capital RMB 3.6 million yuan, occupying more than 5,800 square meter, the production capacity is RMB 15 million yuan, has the ability of engineering, product develop and manufacture mine crusher, the main product: PC series crusher, jaw crusher, roll crusher, line vibrate sieve, SH convert sieve,TD75、TDII fixed belt conveyer, QD80 light belt conveyer, Y45 moving conveyer, DY mobile conveyer, elevator series, screw conveyer and vibrate feeder etc.

太原市北方机械厂创建于1980年，现有资产360万元，占地面积5800多平方米，年生产能力1500万元，是一家集研究设计、产品开发、加工制造为一体的矿山破碎机械厂，主要产品有PC系列破碎机、鄂式破碎机、辊式破碎机、系列直线振动筛、SH型回转筛，TD75、TDII型固定带式输送机、QD80轻型带式输送机、Y45移动式输送机、DY移动式输送机、系列提升机、螺旋输送机、振动给料机等。

This thesis presents the studies of U-shape gantry structure of container gantry crane, and dynamic simulation and fatigue life estimation of its rigid anti-sway. The main contends are as follows: Supposed that trolley frame is composed of spring structure, due to larger trolley gauge of U-shape gantry structure. For the gantry crane, a series spring dynamic vibrating model with three masses, three freedoms of degrees is built in this thesis and vibrating calculus equations are precisely resolved by mode analyses rule.

本文研究集装箱门式起重机U型门架结构及其刚性减摇系统的动态仿真和疲劳寿命估算，主要内容如下：由于U型门架结构小车轨距较大，本文建立了考虑小车架为弹性结构时门式起重机的三质量三自由度串联弹性动力学振动模型，用模态分析法求解振动系统微分方程组的数值精确解。

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。