For cable-stayed bridges, cable tension and its variation are two of the most important factors for judging whether the bridges are functional or not. Therefore, the in-situ monitoring of the stayed cables' tension of the cable-stayed bridge is very important and necessary, from which we can determine the health of the bridge. However, how to acquire and retrieve the signal is the key problem to determine whether the method is suitable for in-situ monitoring of the cable tension of cable-stayed bridges. In this paper, polyvinylidene fluoride (PVDF) piezoelectric films are used as the sensors to acquire the dynamic responses of the stayed cables, from which the tension of the stayed cables can be determined. Signal retrieval from the PVDF film sensors via wireless transmission technology is developed, which could be used for the wireless in-situ monitoring of the cable tension. The principles, feasibility, and configuration of the wireless system for monitoring the stayed cable tension of cable-stayed bridges are investigated. Also the validating experiment is performed on a smallscale stayed cable model in the laboratory. Results show that the proposed wireless monitoring system is feasible for the in-situ monitoring of the stayed cable tension. The method and transmission system can be applied to wireless health monitoring of civil infrastructures with various sensors.

本文概述了基于光纤中拉曼后向散射的分布式光纤温度传感器原理，及立足于国内技术的分布式拉曼光纤温度传感器系统。

The stayed cables of cable-stayed bridges are the main load-bearing components. The cable tension and its variation are two of the most important criteria for judging if a cable-stayed bridge is in order. Through monitoring the cable tension and its variation, the overall technical condition of a cable-stayed bridge can be estimated and whether the cable socket system and protecting system are functional and whether the steel wires in the stayed cables are rusted can be checked. In this paper the frequency analysis method for in situ measuring of cable tension with polyvinylidene fluoride (PVDF) piezoelectric films is put forward. The relationship between the cable sag and the cable tension is explored and the disadvantages of the traditional measuring method of cable tension with frequency analysis are also represented, as are the explicit error equation and its compensation methods. The simultaneous experimental results on a stayed-cable model and the comparison results measured with the accelerometer are presented.

介绍了智能结构系统的内涵、国内外发展现状与发展前景，并对"十五"我国发展智能结构系统提出了具体建议。

根据牛顿流体模型和滨汉塑性流体模型，分别对混合工作模式的汽车磁流变减振器进行了理论分析研究。按照长安微型汽车的技术要求，设计和制作了汽车磁流变减振器，并对此进行了试验测试。试验结果表明，应用所提出的理论分析模型是可行的，对设计特殊阻尼特性的磁流变减振器有一定的指导意义。

从多光束干涉的基本原理出发，分析了光源光谱对光纤法布里珀罗应变传感系统的影响。通过分析发现光源光谱的高斯分布会使光纤法布里珀罗应变传感系统产生测量误差，并从理论上推导出了这种误差的计算公式；通过计算机仿真发现光源的影响使应变测量结果出现了连续周期性的跳变，并通过实验验证了这种变化规律。

Shape memory alloys (SMAs) are composed of austenite and martensite and the volume fraction of each phase evolves during thermomechanical loading histories. The constitutive behavior of a SMA is substantially the combination of the individual behavior of each of the two phases. Based on mixture theory, a two-phase mixture constitutive model is proposed, in which the behavior of the austenite is assumed to be linearly elastic while that of the martensite is elastoplastic. The pseudoelastic behavior of a Cu-Al-Zn-Mn polycrystal subjected to proportional and complex stress or strain histories is analysed, and the main features are well replicated. The proposed model is physically distinct, simple and can easily be applied in practical engineering problems.

在光电圆刻机上，为了获得高精度刻划指令，设计了切向圆光栅全接收系统。本文首先推导了低频圆光栅组件，非相干光入射时的理想莫尔场方程，然后在频域内详细讨论了分度误差与均匀性误差同时存在时实际莫尔场频谱。研究指出，全接收实质上是光阑空间频率等于误差基本空间频率的一种空间滤波器，提高精度作用集中表现在能够滤去大量误差谐波成分。在全接收窄带近似条件下： 1. 只有动（或静）栅存在误差时，莫尔信号既不产生相位误差，也不产生幅值误差。 2. 动栅与静栅同性质误差（即均匀-均匀、分度-分度）交互组合，只引起莫尔信号幅值变化，不产生相位误差。 3. 只有动栅与静栅不同性质误差同时存在与交互组合，才导致莫尔信号产生相位误差。 4. 由于各误差频谱成分幅值大大小于1，所以残留相位误差及幅值误差已在为减小。 5. 为了提高本全接收系统精度，主要应减少动栅的分度误差与光源、静栅、全接收器等的均匀性误差。 最后列出了精度测试结果，测试结果表明，全兿收是提高光栅测角系统精度的重要手段之一。

Piezoelectric ceramics are good candidate materials for sensor and aetuator applications, because of its ability to convert mechanical energy to electrical energy and vice versa. The response speed of Electro-mechanical converting signal in piezoelectric transducers is up to a few hundreds kilohertz, Therefore. they are widely used in vibration and acoustic system. In these applications, the nonlinearity of the materials is a main factor to consider when one designs the control system. In this paper, the nonlinearity of electro-mechanival conpling of PbZrxTi(1-x) O3 was investigated. Experimental results showed that the piezoelectric properties of PZT are greatly affected by the sequence and the amplitude of the applied voltage.

具有仿人智能功能与生命特征的土建结构是人类长期的梦想，由于信息、材料与工程科技的进步，这一梦想可能变为现实。本文提出了智能结构系统的概念和定义，强调了它在减灾防灾中的重大意义与作用。概述了土建结构健康监测与结构响应控制的研究动向。简要介绍了重庆大学在这一领域中的研究工作，并提出了"十五"期间应当研究的主要课题。