汽车油箱检漏系统的研制

采用气体压差原理研制了一种用于汽车生产中油箱密封性的智能检漏系统。在系统结构设计的基础上,又设计了其硬件电路、编写了软件,并采取了抗干扰措施。     

高强度铁道车辆用钢的焊接研究

研究了宝钢高强度铁道车辆用钢的焊接性。针对焊接材料熔敷金属、焊接接头塑韧性不能满足新型铁道车辆焊接中梁制造要求的现状，开发了新的配套气体保护焊耐候焊丝。结果表明，新开发焊丝的熔敷金属及其焊接接头，不但强度高，抗焊接冷裂能力强，塑性好，-40℃的低温冲击性能Axv≥60J，而且具有高耐候性。该钢种与焊丝已用于铁道车辆新车型的试制。     

Solving large multiple-depot multiple-vehicle-type bus scheduling problems in practice

We consider the multiple-depot multiple-vehicle-type scheduling problem (MDVSP) which arises in public transport bus companies and aims to assign buses to cover a given set of timetabled trips with consideration of practical requirements, such as multiple depots and vehicle types as well as depot capacities. An optimal schedule is characterized by minimal fleet size and minimal operational costs including costs for empty movements and waiting time. It is well-known that the MDVSP is NP-hard.Although progress has recently been made in solving large practical MDVSP to optimality with time-space network models, current optimization technology sets limits to the model size that can be solved. In order to approach very large practical instances we propose a two-phase method which produces close to optimal solutions. This modeling approach enables us to solve real-world problem instances with thousands of scheduled trips by direct application of standard optimization software. Furthermore, we introduce the concept of depot groups for the case that a bus may return in the evening into another depot than where it started in the morning.     

Fuzzy logic control of vehicle suspensions with dry friction nonlinearity

We design and investigate the performance of fuzzy logic-controlled (FLC) active suspensions on a nonlinear vehicle model with four degrees of freedom, without causing any degeneration in suspension working limits. Force actuators were mounted parallel to the suspensions. In this new approach, linear combinations of the vertical velocities of the suspension ends and accelerations of the points of connection of the suspension to the body have been used as input variables. The study clearly demonstrates the effectiveness of the fuzzy logic controller for active suspension systems. Suspension working space degeneration is the most important problem in various applications. Decreasing the amplitudes of vehicle body vibrations improves ride comfort. Body bounce and pitch motion of the vehicle are presented both in time domain when travelling over a ramp-step road profile and in frequency domain. The results are compared with those of uncontrolled systems. At the end of this study, the performance and the advantage of the suggested approach and the improvement in ride comfort are discussed.     

Development of a Position Sensitive Neutron Detector with High Efficiency and Energy Resolution for Use at High-Flux Beam Sources

We are developing a high-efficiency neutron detector with 1 cm position resolution and coarse energy resolution for use at high-flux neutron source facilities currently proposed or under construction. The detector concept integrates a segmented ³He ionization chamber with the position sensitive, charged particle collection methods of a MicroMegas detector. Neutron absorption on the helium produces protons and tritons that ionize the fill gas. The charge is amplified in the field region around a wire mesh and subsequently detected in current mode by wire strips mounted on a substrate. One module consisting of a high-voltage plate, a field-shaping high-voltage plate, a grid and wire strips defines a detection region. For 100 % efficiency, detector modules are consecutively placed along the beam axis. Analysis over several regions with alternating wire strip orientation provides a two-dimensional beam profile. By using ³He, a 1/v absorption gas, each axial region captures neutrons of a different energy range, providing an energy-sensitive detection scheme especially useful at continuous beam sources.     

基于MEMS加速度传感器的双轴倾角计及其应用

利用MEMS加速度传感器设计了双轴倾角计,并采用单片机进行了线性化和温度补偿,倾斜角以模拟量和数字量2种形式输出。该倾角计体积小、重量轻、精度高,能够很好地满足MAV姿态控制及其他应用的倾角测量。     

常规控制和模糊PID控制在全垫升气垫船航向控制中的应用

本文详细的介绍了常规控制和模糊PID控制在全垫升气垫船的航向控制中的应用。气垫船是一种高性能船,其航向较常规船舶更难于控制。本文设计了常规PID控制和模糊PID控制器两种控制方法,并对气垫船的航向控制进行了仿真,从仿真结果可以看出,在气垫船受风力的作用下,模糊PID控制器在克服干扰方面具有比常规PID控制更好的效果。     

无人机飞控设备检测系统

介绍了一种无人机飞控设备检测系统,给出了系统的组成和硬件配置,讨论了系统软件设计和测试原理。该系统可以自动检测和校准无人机各种传感器、机载计算机及舵机的输出参数,具有一定的可靠性和准确性。     

一种数字化总线式火灾探测器

介绍以微型单片机PIC16C54/56、串行A/D芯片LTC1297和离子烟雾传感器为基本部件,利用LTC1297的自动断电功能,组成数字化总线式火灾探测器的基本原理,结合实际应用,分析了串行A/D芯片可供选择的几种工作方式,并给出了试验结果,该探测器具有结构简单、耗电量小、测量精确和控制灵活等特点,适合远距离总线式数据采集系统的要求,大大地提高了火灾报警系统的可靠性,对设计各种类型的数字化总线式探测器具有实用参考价值。     

大体积阱式NaI(Tl)探测器的效率计算与测量

使用蒙特卡罗方法模拟计算了一个用于4πγ计数的大体积阱式NaI(Tl)探测器的效率和能谱。采用一系列单能γ源标定探测器,对计算结果进行检验,其结果基本一致,两者间的最大偏差不超过±8%,证明计算结果是可靠的。