Multi-agent and driving behavior based rear-end collision alarm modeling and simulating

Distance-between-vehicle-measurement is the only factor in traditional car rear-end alarm system. To address the above problem, this paper proposes an alarming model based on multi-agent systems (MAS) and driving behavior. It consists of four different types of agents that can either work alone or collaborate through a communications protocol on the basis of the extended KQML. The rear-end alarming algorithm applies the Bayes decision theory to calculate the probability of collision and prevent its occurrence real-time. The learning algorithm of driving behavior based on ensemble artificial neural network (ANN) and the decision procedure based on Bayes’ theory are also described in this paper. Both autonomy and reliability are enhanced in the proposed system. The effectiveness and robustness of the model have been confirmed by the simulated experiments.     

A hybrid immune simulated annealing algorithm for the job shop scheduling problem

A hybrid simulated annealing algorithm based on a novel immune mechanism is proposed for the job shop scheduling problem with the objective of minimizing total weighted tardiness. The proposed immune procedure is built on the following fundamental idea: the bottleneck jobs existing in each scheduling instance generally constitute the key factors in the attempt to improve the quality of final schedules, and thus, the sequencing of these jobs needs more intensive optimization. To quantitatively describe the bottleneck job distribution, we design a fuzzy inference system for evaluating the bottleneck level (i.e. the criticality) of each job. By combining the immune procedure with a simulated annealing algorithm, we design a hybrid optimization algorithm which is subsequently tested on a number of job shop instances. Computational results for different-sized instances show that the proposed hybrid algorithm performs effectively and converges fast to satisfactory solutions.     

Improved image interpreting and modeling technique for automated structural optimization system

The automated structural optimization system (ASOS) proposed in the previous work incorporates the image-preprocessing techniques, the image-interpreting technique, and the automated shape-optimization modeling techniques to successfully obtain an autonomously integrated topology and shape optimization. However, the characteristic value-based image-interpreting technique used in ASOS is unable to accurately interpret complicated hole shapes, necessitating the use of the hole shape-adjusting strategy in addition to the hole-expanding strategy and the interference analysis in the automated shape-optimization modeling techniques to obtain a viable initial design and side constraints of design variables. In order to solve the above-mentioned problem in ASOS, this paper proposes the improved automated structural optimization system (IASOS) and uses the polygonal image-interpreting technique to replace the characteristic value-based image-interpreting technique used in ASOS. This alteration significantly increases the accuracy of image interpretation. Moreover, it can simplify the process of automated shape-optimization modeling techniques, reduce the design duration, and produce better results.     

Modified BVD model of PZT actuator using high-voltage square pulse method for micropumps

The field of micro–electro–mechanical systems and microfabrication has produced micro-total-analysis systems, which are widely used in medicine, diagnostics, and biological and chemical research. For the development of high precision drug delivery systems, micropumps with a lead zirconate titanate (PZT) actuator, which has a fast response time and high resolution, are most likely to be applied in implementations. To improve the performance of PZT micropumps utilized in the microfluidics field, suitable models are required to enable the optimization of the PZT actuator driving circuits. This study proposes a modified Butterworth–Van Dyke (BVD) model which consists of a BVD model in series with an electrical resistance that describes a PZT actuator driven by a square pulse with a relatively high voltage and low frequency for micropump applications. Experiments were conducted to assess parameters of the model at various voltages; they indicate that the electrical resistance is essential for modeling the PZT actuator of the micropump. The electrical model was verified using a SPICE simulation, whose numerical results were compared with the experimental data for the current response of the PZT actuator. The results show a close correlation between the simulation of the electrical model and the measurements of the PZT actuator under real operating conditions.     

超前瓦斯排放钻孔有效排放半径的测定

介绍了煤层超前钻孔的防突机理,比较和分析了超前瓦斯排放钻孔有效排放半径的3种测定方法,选择钻屑量与钻屑瓦斯解吸指标法进行了现场应用。应用结果表明,使用钻屑量与钻屑瓦斯解吸指标法测定排放钻孔的有效排放半径简便易行,准确可靠。     

基于μC/OS-Ⅱ实现PC机与1553B总线接口的数据通讯

MIL-STD-1553B数据总线协议是在航空电子综合化技术发展过程中形成的现代航空机载系统通讯设备的接口标准,为了提高与计算机之间通信的可靠性.提出了基于μC/OS-Ⅱ的实时操作系统,通过采用TMS320F2812型DSP与FPGA相结合的设计思想来实现1553B总线接口与计算机之间的数据接收与发送;同时给出了主要的硬件接口电路和软件设计流程及相荚程序代码;最后针对接口通讯模块进行相关测试,初步测试证明能够完成通讯任务;设计增强了总线通讯的可靠性和实时性,同时提高了系统的整体性能.     

复杂噪声下自行高炮通信系统语音信号检测方法研究

研究了在噪声环境下自行高炮通信系统语音信号的检测方法,提出了在高信噪比环境下采用短时平均幅度(AM)算法与短时平均幅度差(AMDF)算法检测相结合的二级判断法,在低信噪比的情况下采用短时高低频能量比的算法,实现语音信号在不同噪声环境下的检测;实验结果表明,高信噪比情况下二级判别法具有良好的语音识别效果,低信噪比情况下短时高低频能量比算法可以有效地检测出语音端点,避免切音现象;与传统语音检测算法相比,此方法不同信噪比状态下都具有较好的检测效果,体现出算法一定的优越性.     

一种航空直流固态功率控制器的设计

提出了一种基于嵌入式实时操作系统μC/OS-Ⅱ和CPLD的SSPC设计方案.对整个系统的结构进行了分析,结合分析给出了系统硬件和软件设计方案.硬件设计部分给出了系统的硬件结构原理图,分析了系统性能和各部分功能,并绘出了子系统的设计;软件部分根据μC/OS-Ⅱ系统建立了任务结构框图和系统流程,给出了I2T反时限保护的一种算法,并通过对CPLD的编程实现SSPC的短路保护功能;实验证明这种设计方案具有硬件电路设计简单、实时性好、可靠性高和智能化水平高的优点,符合航空直流固态功率控制器的设计要求.     

智能引爆机器人的研究与制作

为了代替人类完成危险情况下的工作任务,例如,进行危桥、危楼的爆破,危险环境下重要物品的拾取等;研究与制作了基于单片机技术和RS232串口通信技术的远程遥控引爆机器人;重点解决智能引爆机器人上位机控制软件的开发、RS232串口通信技术、单片机及传感器电路设计、无线摄像头的数据采集、多自由度机械手的设计等技术模块,利用Pro/E对机械结构仿真设计及Protel99se进行硬件电路仿真设计;通过机械结构和电子电路仿真,设计并制作了机器人实体结构和控制系统硬件电路,经过多次实物实验,设计制作的机器人能圆满地实现预期功能,控制系统运行状态良好.     

2HL055恒流二极管参数测试

2HL055是贵州博越公司生产的恒流二极管,该类器件恒定电流大,极限电压低,可以直接驱动负载,但器件形成实验室成品后,没有进行过参数测试,其基本参数范围不能确定。文章拟通过试验,进一步测试2HL055器件的基本参数,并确定部分参数的测试方法。