地基中防空洞的荷载验算

论述了不同覆土条件下防空洞的荷载计算公式     

Uphillshift decision strategy of an AMT off-road vehicle based on generalized road resistance coefficient

In order to improve the shift decision strategy for an off-road vehicle with automated manual transmission (AMT), the generalized road resistance coefficient is defined based on the longitudinal dynamics analysis. Vehicle mass and generalized road resistance coefficient are estimated using the recursive least square (RLS) method with multiple forgetting factors. The improved shift schedule is designed based on the generalized road resistance coefficient under uphill road condition. The simulation and real vehicle test verify the effectiveness of improved shift strategy and the improvement of vehicle dynamic performance.     

动力传动一体化控制对提高车辆加速性能的研究

基于大功率柴油机和机械式自动变速器的动力传动一体化控制系统，是我国车辆行业的一个崭新课题。本文在介绍动力传动一体化控制系统组成及工作原理的基础上，重点讨论了一体化控制对提高车辆加速性能的影响。实车试验结果表明，与分立的柴油机电子控制系统和自动变速系统相比，动力传动一体化控制系统发挥了控制系统的优势，提高了车辆的加速性能。     

Self-adaptive correction of clutch control with proportional valve

A new method for self-adaptive correction of the clutch proportional valve by Lyapunov stability function is proposed. Compared with displacement curve of hydraulic control cylinder under standard load, pulse width modulation (PWM) voltage imposed on clutch proportional valve is corrected according to the error to improve the consistency of the clutch control system in the process of clutch engagement. Computer simulations are conducted with this self-adaptive correction method by establishing the clutch control system model and results indicate that the principle of the method is correct. The flow rate variation obtains effective restraint which is caused by clutch control system characteristic of different vehicle under constant PWM voltage.     

槲皮素及其两种配合物清除亚硝酸钠的活性研究

采用对氨基苯磺酸-盐酸萘乙二胺法测定了槲皮素、槲皮素-Al及槲皮素-B三种物质对亚硝酸钠的清除率。结果表明,槲皮素及其配合物对亚硝酸钠具有一定的清除作用,且槲皮素-Al及槲皮素-B配合物对亚硝酸钠的清除率明显高于槲皮素。在最佳反应条件下,即质量浓度为0.4 mg/mL的清除剂用量1.2 mL,反应温度50 ℃,反应时间30 min,槲皮素对亚硝酸钠的清除率为25.8%,而槲皮素-Al和槲皮素-B对亚硝酸钠的清除率分别达到了80.2%和84.1%,且槲皮素-B的清除率稍高于槲皮素-Al。     

沸石晶种层形成的影响因素及其对Silicalite-1型沸石膜生长的影响

研究了晶种二次成膜法中提拉法晶种涂层形成的主要影响因素,如载体性质、晶种大小和涂层溶剂及晶种层质量对Silicalite-1沸石水热生长成膜的影响.SEM和XRD分析表明,载体的性质、晶种大小及涂层溶剂对晶种层的形成均有很大影响.晶种在平整的小孔径陶瓷载体上易沉积形成连续晶种层,不平整的大孔载体上难以形成连续晶种层.弱极性的乙醇晶种悬浮液有利于晶种粒子的沉积;疏水性的炭载体不宜采用强极性的水作为溶剂进行晶种涂层,而宜在乙醇悬浮液中进行晶种涂层;纳米级小晶粒晶种易形成连续、均匀的晶种层,大晶粒(600 nm和2.2μm)晶种不易在大孔载体上沉积.用小晶粒晶种形成的连续晶种层,沸石生长形成的膜质量好.结果表明,沸石膜的质量取决于晶种层的质量.     

某发动机复杂油路流场分析及优化设计

以某航空发动机附件齿轮箱“连通折弯式”的复杂油路为研究对象,对油路内部的三维流场进行仿真分析并建立压力-流量模型。基于流场的计算结果,分析齿轮箱进口润滑油流量不足的原因并提出优化方案。结果表明：该发动机因喷嘴结构设计不当,导致齿轮箱油路中局部流通面积较小,局部阻力损失较大,使得油路进口处的润滑油流量偏小。通过对喷嘴结构局部优化,提高了油路中局部流通面积,有效增加了进口的润滑油流量,满足了设计要求。优化后的齿轮箱油路中,压力损失最大的区域在每个喷嘴的喷孔段,但各个管流段压力变化不大,整个油路的压力分布更加合理。建立齿轮箱工作压力范围内的压力-流量的数学模型,为不同进口压力下的润滑油体积流量选择提供了数据支撑     

生物转化应用于中药活性成分研究中的进展

作为中药研究的新思路,推动中药现代化、产业化的核心技术之一的生物转化,目前在中药活性成分研究领域的应用已经获得广泛开展。作者在此主要从转化体系和转化目的方面综述了近年来生物转化应用于中药活性成分的研究概况。     

Fault diagnosis of AMT gear shifting process based on semi-quantitative SDG model

In order to diagnose gear shifting process in automated manual transmission (AMT), a semi-quantitative signed directed graph (SDG) model is applied. Mathematical models are built by analysis of the power train dynamic and the gear shifting control process. The SDG model is built based on related priori knowledge. By calculating the fuzzy membership degree of each compatible passway and its possible fault source, we get the possibilities of failure for each possible fault source. We begin with the nodes with the maximum possibility of failure in order to find the failed part. The diagnosis example shows that it is feasible to use the semi-quantitative SDG model for fault diagnosis of the gear shifting process in AMT.     

Strategy to control crawling vehicles with automated mechanical transmission

In order to move vehicles with automated mechanical transmission (AMT) a little bit of distance, such as reversing into or moving in a garage, a control strategy for crawling vehicles was proposed. Based on the dynamic analysis of vehicle starting process and requirements of crawl driving for the vehicle,a control strategy of the clutch was designed. The strategy increased the slipping friction torque first and then decreased it, in order to realize the crawl driving. The speed increased by the engagement of the clutch, and then the clutch turned to disengage to the half disengage point, when the speed met the requirements. Based on the control strategy, a control software was designed. In the end, the software was tested on a vehicle with AMT. The lowest steady vehicle speed was reduced to 40% of the original value, which was set in the control strategy.