自振

The parameters included drag-span ratio of cable,the value of prestressing force,the thickness of reinforced concrete floor,the cross area of tightwire and the number of prestressed tig.

利用ANSYS有限元分析软件建立了钢筋混凝土楼板模型和预应力空间组合结构模型，对楼板模型和预应力空间组合结构模型分别进行了模态分析，同时分析了垂跨比、预应力度、拉索截面面积、纵向连接索数和楼板厚度对预应力空间组合结构自振特性的影响

Firstly, based on the structure of the vibration characteristics, the response spectrum analysis method is used to study the seismic response of the structure with the two-dimensional and three-dimensional seismic input and vertical seismic analysis of the bridge structure are investigated.

首先，基于结构的自振特性，分别在二维和三维地震动输入下，采用反应谱分析方法，研究结构的地震响应特性，分析竖向地震力对桥梁结构反应的影响。

Finite element method with consideration of gyroscopic effect is used.

本文研究水轮发电机组的横向振动的自振特性，采用考虑连续点的陀螺效应的有限元法进行计算分析。

The liquefiable site was simplified as a double-degree-freedom model and the formula for calculating the reduction of horizontal natural frequency induced by liquefaction was attained.

将可液化场地简化为双质点模型，给出了液化导致场地水平自振频率下降的计算公式，推导出了频率下降率的下限值。

At last, natural frequencies of practical pre-stressed composite space truss are tested with pulsatory method on construction site and its damping ratio is calculated, which gives another important data for engineering design. In addition, through the model experiment of pre-stressed rectangular square pyramid composite space truss, the correctness of characteristics of internal force and the feasibility of tension recovery method are proved.

最后，在工程施工现场用脉动法测试自振频率，并借助于振动衰减曲线和半功率点法计算出预应力组合网架——钢与混凝土的混合结构体系——的阻尼比，此又为工程设计提供了一理论依据；另外，通过正放四角锥预应力组合网架的模型试验，验证了结构内力分布特点的正确性以及张力松弛法的可行性。

They are effective in reducing noises of solid transaudient,are applicable for different types of large and small suspending equipment and pipelines.

该产品具有阻尼比大、自振频率低、安装方便、对固体传声有明显的降噪效果，对于各种大小设备及管道的吊装普遍适用。

In this paper, firstly the influence of the delamination upon the natural frequencies of a laminated beam is studied in detail. By partitioning the delaminated beam, its natural frequencies are obtained.

本文首先详细分析了层合梁的脱层现象对其振动频率的影响，通过对脱层梁进行分区处理，得到了脱层梁自振频率变化的规律。

This websteel system have passed result evaluation masterminded by the science and technology developmental promotion center of ministry of construction.

本课题是通过对这种轻钢结构房屋做地震模拟振动台试验来研究它的动力特性与抗震能力，如自振频率等。

The basic frequences of the two types of bridges are heightened by increasing vertical curve curvature of stiffening girder, setting vertical supporting members and stiffing connection.

增大加劲梁竖曲线曲率，桥塔处设置竖向支撑和缆梁跨中固结均能提高悬索桥的自振基频。

The shape forming processing and loading experiment of a full scale tensioned membrane structure model was carried out with the model frequency measured.

本文对一较大的足尺张拉膜结构模型进行了张拉成型和荷载试验，并进行了模型的自振频率测量试验。

Plunder melds and run with this jewel!

掠夺melds和运行与此宝石！

My dream is to be a crazy growing tree and extend at the edge between the city and the forest.

此刻，也许正是在通往天国的路上，我体验着这白色的晕旋。