基于主元分析的传感器故障检测与诊断

介绍主元分析方法在温度传感器故障检测与诊断中的应用。通过计算实际测量值和故障重构值及它们值的统计特性来识别故障类型；通过改进故障判别指数SPE及SVI，提高了故障检测与诊断的准确率。     

Transmission of dynamic biochemical signals in the shallow microfluidic channel: nonlinear modulation of the pulsatile flow

A controlled quantitative loading of dynamic biochemical signals on cells in vitro is essential for cell dynamic analysis. Microfluidics provides the potential for reproducing and controlling spatio-temporal biochemical signals through the various microfluidic channels. Herein we investigate the transmission characteristics of dynamic biochemical signals in pulsatile flows by analytically solving the convection–diffusion equation for the time-dependent Taylor–Aris dispersion with perturbation method. We prove that the transmission of dynamic biochemical signals in pulsatile flows is subject to the two correlate effects: low-pass filtering and nonlinear amplitude–frequency modulation. These two effects are systematically characterized and the influence factors are studied, including the biochemical signal frequency, the pulsatile flow frequency, the transmission distance and the average pulsatile flow rate. We concluded that the balance of multiple factors should be taken into account for better loading biochemical signals on cells cultured in the microfluidic channel.     

高盐分餐厨垃圾湿式单级厌氧消化的试验研究

对高盐分餐厨垃圾湿式厌氧发酵进行了研究,试验结果表明:发酵液盐分浓度不断累积,由最初的0.084%增长至0.69%,并且还在继续增加;进料有机负荷控制在3 kgVS/(m3·d)时,反应器运行良好,发酵液COD稳定在2 620 mg/L左右,VFA浓度保持在880 mg/L以下,产气量81 L/d,甲烷含量60%左右.     

结构在水平与竖向地震同时作用的非平稳响应

本文对单自由度结构在水平与竖向地震同时作用下的随机地震响应问题进行了系统研究。首先用简明的推导方法,建立了结构参激随机振动方程;其次利用Stratonovich随机微分方程、It随机微分方程、FokkerPlanck方程和矩微分方程的相互转换关系,用统一的公式法,建立了结构响应矩方程;然后根据Hurwitz随机稳定准则,获得了结构一阶和二阶响应矩渐近稳定条件的解析判断式;最后针对非平稳水平地震激励的最典型四种强度包络函数,综合应用复模态法,获得了结构非平稳响应二阶矩的解析解,给出了算例,并综合分析了各种参数对结构响应和稳定性的影响。     

受弯构件纵向受力钢筋最小配筋百分率质疑与改进建议

分析了现行混凝土结构设计规范中对纵向受力钢筋所作最小配筋百分率ρｍｉｎ规定和相应设计计算方法的不足，建议用截面最小纵向受力钢筋面积Ａｓｍｉｎ取而代之，并提出相就的设计计算方法供参考。     

Estimating Displacement of Periodic Motion With Inertial Sensors

Inertial sensors, like accelerometers and gyroscopes, are rarely used by themselves to measure displacement. Accuracy of inertial sensors is greatly handicapped by the notorious integration drift, which arises due to numerical integration of the sensors zero bias error. A solution is proposed in this paper to provide drift free estimation of displacement from inertial sensors.     

智能神经网络程序设计语言的研究与实现

将神经网络与逻辑推理统一到面向对象理论中,建立了同时具备神经网络和专家系统特性、融合连接机制和符号机制的智能神经元模型。提出了一种新的程序设计语言——智能神经网络程序语言(NIPL),实现了神经计算、逻辑推理和数值计算的统一。定义了NIPL的语法,设计并实现了智能神经网络程序设计语言NIPL编译器,从而为开发智能神经网络应用系统提供了有效的手段。     

大尺寸电磁振镜的RDLS-DE算法辨识

针对大尺寸电磁振镜系统,提出"递推阻尼最小二乘-差分进化"算法进行系统辨识.首先通过递推阻尼最小二乘法对该系统进行初步模型辨识后,得到相对准确的种群范围,在此辨识基础上选择小范围的种群作为差分进化算法的初始化种群,经过反复变异、交叉和选择,最终辨识出待辨识参数的最优值.通过对该方法进行仿真辨识和实验验证,结果表明,在收...     

On the optimum design of rotating two-layered composite tubes subject to internal heating or pressure

Subject of this analytical investigation is a rotating two-layered hollow cylinder under generalized plane strain subject to an elevated temperature at the inner surface or to internal pressure. It is presupposed that the inner cylindrical layer consists of the heavier material, whereas the outer layer is made of a material with lower density, like for example in a steel/aluminum tube. Criterion for the maximum permissible stress is the yield criterion by von Mises, and the device is optimized with respect to its weight. It is found that plasticization may start at different radii, and the study provides not only a comprehensive overview of the elastic limits of composite tubes of the above type but also a straightforward procedure for determining the optimum composition.     

RTL级模拟矢量自动生成设计化简方法研究

提出一种Verilog程序切片算法,给出了该算法的正确性证明的理论框架;并利用提出的Verilog程序切片算法对Verilog RTL级设计进行化简,实现模拟矢量自动生成状态化简目的,实验结果表明：该算法对状态化简效果非常明显,可以有效地解决状态空间爆炸问题。