新型分布式振动阻尼器的理论和实验研究

研究了分布式振动阻尼器，在理论分析的基础上，对其宽带阻尼放大作用进行了理论计算和多 方案的实验验证，理论计算和模型试验的结果进一步说明了分布式振动阻尼器相对于传统的集中式阻 尼器而言，能大大增加振动能量的耗散，具有进一步减振的优点。     

机车柴油机轴系扭振的减振特性分析

分析了减振器和弹性联轴节在机车柴油机轴系扭振中的减振特性。减振器能显地减小振振幅和附加剪应力，弹性联轴节可以明显地改变低频固有频率和临界转速，对减小振幅和应力有效果，但会使某些节点的振幅和某些轴段的应力增大。     

磁流变阻尼器动力学特性研究

从材料流变特性和动力学、机械学、电磁学的角度出发，建立了磁流阻尼器的动力学模型。应用该模型可由磁流变阻尼器设计参数得到其动力学特性，如力—速度曲线，并与试验结果相吻合，为磁流阻尼器设计和性能预测提供了参考。     

粘滞阻尼器被动消能体系基于位移设计方法

针对新建粘滞阻尼器被动消能体系和已建结构采用粘滞阻尼器进行加固,其现有设计方法需要多次试算、十分繁琐的情况,将结构等效为SDOF体系,基于目标位移可以很方便地求出所需粘滞阻尼器的附加阻尼比,选择合理的分布模式即可计算出结构各层安装阻尼器的数量。采用1栋5层的新建结构和1栋10层已建结构验证该方法。时程分析和振型Pushover分析结果表明,采用该方法在Pushover适用范围内可以取得较高的精度。     

Passive control of jacket–type offshore wind turbine vibrations by single and multiple tuned mass dampers

Vibration control is gaining focuses in the field of offshore wind turbines (OWTs) in recent years as the turbine tower becomes taller and more slender. Although a number of research works have been carried out to control the OWT vibrations, using tuned mass damper (TMD) and multiple tuned mass dampers (MTMDs) to control the jacket–type OWT vibrations is rarely reported, especially for the MTMDs, of which the application in the field of OWTs is still in the initial stage. This study focuses on the performance of TMD and MTMDs in controlling the tower vibrations of the jacket–type OWT subjected to the combined wind, wave and current loads, which are the most common external vibration resources for OWTs. The control effectiveness is numerically investigated and evaluated by the reductions of the standard deviation displacement (σ(d)) and the standard deviation acceleration (σ(a)) of the tower top. After the installation of TMD, σ(d) and σ(a) are reduced by 32% and 29% respectively. Larger TMD mass ratios lead to better control effectiveness, but the improvement becomes less obvious as the mass ratios constantly increase. The control effectiveness of the MTMD system is slightly decreased compared with a single large TMD. However, the robustness of MTMDs is superior since the OWT vibrations can still be controlled effectively even if some TMDs do not function. The control effectiveness of the MTMD system can also be affected by the change in the positions of malfunctioned TMDs.     

摩托车用无刷起动磁电机

针对早期的起动磁电机起动及发电均通过碳刷－整流子装置，存在维护困难、使用寿命等总是，介绍了一种摩托车用无刷起动磁电机，它集起动，发电与点火功能于一体，并采用电子换向器替代机械换向装置，从而克服了由电和整流子所带来的一系列问题，详细介绍了其电机结构、电子换向器结构及点系统的特点。     

Experimental and numerical study on tuned liquid dampers for controlling earthquake response of jacket offshore platform

Earthquake loading has to be considered when the offshore platform is constructed in active fault zone. Tuned liquid dampers (TLD) have been proposed to control the dynamic response of structures. Liquid sloshing experiments on cylinder tank show the sloshing happens more seriously when the frequency of external excitation is close to the fundamental sloshing frequency of liquid. Lumped mass method is employed to numerically analyze the controlling earthquake effect on TLD. Based on TLDs the feasibility to control earthquake response of jacket platform is studied and applied to CB32A oil tank platform. Using extra TLDs in CB32A to control the seismic response of the platform is researched by the model test and numerical simulation. Lumped mass method can simulate the behavior of TLD during earthquake very well and gives close numerical results compared with those from model experiments. It has been found that the ratio of the fundamental sloshing frequency of liquid to the natural frequency of platform is the key factor to control earthquake response. The larger ratio of water-mass to platform-mass is also useful to reduce vibration as well.     

弧形耗能器加固震损木构架抗震性能研究

基于榫卯节点木构架具有优良的抗震性能,开展参数化弧形耗能器加固榫卯节点木构架抗震性能试验研究。对震损后的榫卯节点木构架试件用不同厚度、半径的弧形耗能器进行加固,并研究其加固后的抗震性能,对比加固前后试件的抗震性能指标,确定相同尺寸弧形耗能器对不同尺寸木构架的加固效果,不同尺寸弧形耗能器对相同尺寸木构架的加固效果。     

海洋平台磁流变模糊半主动振动控制研究

为更有效地减小海洋平台动力响应,采用基于模糊控制算法的磁流变阻尼器对海洋平台的振动进行控制.以海洋平台位移响应误差和误差变化为输入变量、以最优控制力为输出变量,优化设计出模糊控制器,根据磁流变半主动控制算法提供接近于最优控制力的半主动控制力.数值仿真结果表明:在模糊磁流变控制中,无论是对于位移反应、速度反应还是加速度反应都可以实现非常有效的控制.     

结构MTMD振动控制参数优化研究

研究了结构ＳＤＯＦ－ＭＴＭＤ系统在随机激励下的响应,应用谱分析方法优化了ＭＴ－ＭＤ参数,从工程应用实际出给出了其设计方法,数值分析表明,在相同质量比下ＭＴＭＤ的减效果优于单个ＴＭＤ。