频率量输出型传感器的动态校准方法研究

研究了频率量输出型传感器的动态校准问题，探讨了满足动态校准要求的非等周期频率测量方法以及相应的测量精度、分辨率和采样周期之间的关系，提出了非等周期时间序列分析的虚拟采样预处理方法，进而实现用常规失支来分析频率量输出型传感器的动态性能和建立其动态模型。     

圆柱形黑体腔热辐射及其在光纤中的传输

分析了圆柱形黑体腔腔内视在发射率的分布及腔体发射率，讨论了斜光线在光纤中的耦合与传输，并导出了光纤中传输的辐射功率表达式和光电探测器输出电流表达式。探测器输出电流的表达式表明，光电流的大小除随黑体腔温度变化外，还与探测器的下限、上限截止波长有关。下限、上限截止波长的间隔愈大，则光电流愈大，故在接收辐射功率时，探测器前不加窄带滤波片。文中还给出了光电流随温度变化的理论曲线和实验曲线，两者基本吻合。     

压电薄板的建模和阻尼的准独立模态控制

导出压电薄板的传递函数模型,建立起压电结构与一般结构模态控制的类比关系。基于此,结合实验研究,提出“准独立模态控制”方法,能在尽可能简单的硬件条件下逼近独立模态控制目标。多模态阻尼控制实验进程和结果表明了它的有效性和实用性。     

压电类智能梁元的优化布局

分别对具有无限小长度驱动器的悬臂和简支智能梁的一阶模态和二阶模态进行了具体的分析和计算,确定了驱动器在梁元中的最优布局,总结了有关驱动器在梁元中布局的一些基本性质,并从解析的角度对驱动器的最优布局点给予解释.由于以上有关驱动器最优布局的分析是在忽略驱动器的长度的假设基础上进行的,所以又对有限长度的驱动器的布局问题进行了初步的探讨.     

Study on segmented distribution for reliability evaluation

In practice, the failure rate of most equipment exhibits different tendencies at different stages and even its failure rate curve behaves a multimodal trace during its life cycle. As a result, traditionally evaluating the reliability of equipment with a single model may lead to severer errors. However, if lifetime is divided into several different intervals according to the characteristics of its failure rate, piecewise fitting can more accurately approximate the failure rate of equipment. There-fore, in this paper, failure rate is regarded as a piecewise function, and two kinds of segmented dis-tribution are put forward to evaluate reliability. In order to estimate parameters in the segmented reliability function, Bayesian estimation and maximum likelihood estimation (MLE) of the seg-mented distribution are discussed in this paper. Since traditional information criterion is not suit-able for the segmented distribution, an improved information criterion is proposed to test and evaluate the segmented reliability model in this paper. After a great deal of testing and verification, the segmented reliability model and its estimation methods presented in this paper are proven more efficient and accurate than the traditional non-segmented single model, especially when the change of the failure rate is time-phased or multimodal. The significant performance of the segmented reli-ability model in evaluating reliability of proximity sensors of leading-edge flap in civil aircraft indi-cates that the segmented distribution and its estimation method in this paper could be useful and accurate.     

多路传感器系统的软件补偿和校准技术的研究

分析了多路传感器系统的软件补偿和校准技术的发展趋势,并根据国内测试校准压力传感器的要求,对自补偿和自校准技术加以研究,同时提出了适合应用的解决方案。     

防空导弹惯性技术综述及展望

从精确打击入手阐述了惯性技术对于防空导弹的重要性,提出惯性技术是防空导弹自主导航制导的核心之一。回顾了防空导弹惯性技术的发展历程,从快速反应、工作环境、测量精度等方面概述了防空导弹对惯性技术的需求,梳理了惯性传感器技术、动基座对准技术、高精度自主导航技术等几个关键技术。最后,从新型惯性传感器技术、新材料和新制造技术、新应用场景新需求等方面分析了防空导弹惯性技术的发展趋势,并从工程应用层面对防空导弹惯性技术的发展方向进行了展望。     

Fault processing policy based on dual-redundant control law for aero-engine control sensors

A fault processing policy was proposed for the circumstance under which all the dual-redundant closed-loop feedback control sensors went wrong. This policy was based on dual-redundant control law and may maintain the performance of turbofan engines. When pair of controlling sensors went wrong and the primary control law was unable to implement, control system performs the backup control law instead of the primary one so that the fault sensors were isolated from the closed control loop. This fault processing policy may not only avoid increasing engine weight and cost with the additional sensors hardware, but also avoid the error of analytical sensor signal. It can improve the engine mission reliability and control quality.     

Non-destructive Evaluation of Composite Pressure Vessel by Using FBG Sensors

In recent years, advanced composite structures are used extensively in many industries such as aerospace, aircraft, automobile, pipeline and civil engineering. Reliability and safety are crucial requirements posed by them to the advanced composite structures be- cause of their harsh working conditions. Therefore, as a very important measure, structural health monitoring (SHM) in-service is defi- nitely demanded for ensuring their safe working in-situ. In this paper, fiber Bragg grating (FBG) sensors are surface-mounted on the hoop and in the axial directions of a FRP pressure vessel to monitor the strain status during its pressurization. The experimental results show that the FBG sensors could be used to monitor the strain development and determine the ultimate failure strain of the composite pressure vessel.     

硅微谐振式加速度计技术现状及展望

硅微谐振式微加速度计是各种MEMS加速度计中被普遍看好并期待为将来的高精度微加速度计发展的一个重要方向,正在全世界范围内被广泛研究。本文对硅微谐振式微加速度计的发展现状进行了评述。根据国内外不同的技术实现,诸如工作原理、微加工工艺实现、应用范围等对其进行了分类阐述。最后,对硅微谐振式加速度计研究中一些关键技术进行了讨论,并提出了展望。