阻尼振动

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。

This essay will remark on auto air-condition noise problems through studying expansion valve. The main reasons incurred noise are two, one is vibration, which is from big air bubble caused by the refrigerant flows through expansion valve. Another is resonance, which is from engineering working itself. So, the two methods for eliminating noise are found. On one hand, through increasing damp to weaken resonance. On another hand, through taking off air bubble to eliminate vibration. The essay presents method of solving noise through improving expansion valve and elaborate the disadvantages caused by these solvement.

本文从膨胀阀的角度去考虑解决汽车空调异响问题，认为产生异响的主要原因是制冷剂流经膨胀阀节流部时有大气泡存在引起振动与汽车发动机共振造成，从增加阻尼块来减振和分解大气泡来消除震动等两方面提出解决方法，并对此方法造成的不利方面也进行了阐述。

The results indicate that superelastic TiNi shape memory alloy bars have the characteristics of high energy dissipation and damping property, so they are suitable for engineering vibration control.

结果表明：超弹性TiNi形状记忆合金棒材具有良好的耗能能力及阻尼性能，可满足工程结构振动控制的需要。

Under the condition of knowing trolly"s relation datas, the wire rop-load modle taking its load as the study object, using D"Alembert"s Principle and Hybrid method, solves out the mathematical expression of wire rop"s traction while settig the hiost speed; The elctronic motor-drum modle"s build up is attracted to the elctronic motor"s torque, and combines with the wire rop traction"s role on drum, only pay attation to the coupling"s flexibility and damping, which is between the elctronic motor and the reducer. The theory of transmission equations establishment is in Project Vibration.

钢丝绳—吊重模型是在小车运行机构的相关数据均已知的情况下，以吊重为研究对象，利用达朗伯原理和动静法，在假定起升速度已知后求解出钢丝绳牵引力的表达式；电动机到卷筒部分的模型则是建立在电动机输入转矩形式已知的基础上，结合钢丝绳牵引力作用在卷筒上的工作阻力矩，只考虑电动机与减速箱之间的联轴器的弹性阻尼，利用工程振动原理建立传动方程。

A turnable damping was designed , and based on these, the road tests were done, analytical study on vibration performances of passenger seat were carried out, and the results were accordant.

在可调减振器的设计基础上，分别对车辆阻尼优化前后进行了试验，分析了车身与驾驶员座椅处的振动特性，计算与试验基本吻合。

The rear bogie suspension system is treated as a 3—DOF linear model in which the tyre stiffness and its damping and unsprung masses are considered.

将平衡悬挂系统当作三自由度线性振动模型来处理，并考虑了非簧载质量和轮胎刚性与阻尼的影响。

The isolation spring and polymer damper are very effective in reducing the overall level of vibration under both unweighted and weighted conditions.

隔离弹簧和聚合物阻尼器，不管是在未加重量情况下还是在加重量的情况下，在降低总的振动水平上是非常有效的。

The calculated results show that adopting damping apparatus is a feasible measure for solving aseismic safety of a aqueduct, and that appropriately prolongating period of a vibration-isolationg structure and regulating damping are an effective way of controllong aqueduct vibration.

控振计算表明，采用减隔震装置是解决渡槽抗震安全的可行措施，适度延长隔震结构周期与调整阻尼是控制渡槽振动的有效途径。

In order to reduce timely and effectively the vibration under the condition of different frequency, the paper describes an ER isolator, whose stiffness is invariable and damp is adjustable, prosecutes semi-active control.

为了适时、有效减少其在各种频率下的振动，本文采用了一种刚度不变、阻尼可调的电流变隔振器进行半主动控制。

The cable-stayed bridge ; stay cables ; vibration control ; the adjustable permanent magnet magnetorheological dampers

斜拉桥；拉索；振动控制；永磁调节式MR阻尼器

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。