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。

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.

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.

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.