基于ADAMS二次开发的双前桥转向机构优化设计     

李德光 《大众科技》2013,(6):137-138,345

随着市场需求的发展,用户对双前桥商用车的需求越来越大。文中介绍了双前轴转向汽丰的转向原理,以及以动力学仿真分析软件ADAMS为二次开发平台,建立针对重型双前桥商用车转向系统设计及优化的专用软件系统,对转向机构进行了优化设计。  相似文献   

基于Simulink/VR的智能小车运动控制仿真     

王君 《科技广场》2013,(7):75-77

本文基于Simulink和MATLAB的虚拟现实工具箱,构建了智能小车运动控制系统的仿真模型:利用Simulink优化设计模块确定PID控制器的最优参数;根据Simulink模型计算产生的数据信号来控制和驱动虚拟现实场景中智能小车的行进和转弯。通过仿真演示,能实时观测三维虚拟场景中的小车速度和位置的变化。  相似文献   

粒子群优化算法及其应用   总被引：1，自引：0，他引：1  

李丙春 《喀什师范学院学报》2006,27(3):66-68

介绍了粒子群优化算法及该算法的优越性,并与遗传优化算法进行了比较;针对经典粒子群算法存在的不足,介绍了一个改进的动态改变惯性权的自适应粒子群算法;最后,以神经网络为例给出了粒子群优化算法的应用.  相似文献   

Simple PSF based method for pupil phase mask’s optimization in wavefront coding system     

ZHANG Wen-zi  CHEN Yan-ping  ZHAO Ting-yu  YE Zi  YU Fei-hong 《浙江大学学报(A卷英文版)》2007,(2)

INTRODUCTION Wavefront coding was introduced to increase the depth of focus for optical system in 1995 by Dowski and Cathey (1995). A cubic phase mask was placed in pupil plane to encode the wavefront of the optical system by which the intermediate image formed could almost be invariant in a large depth of focus, and the intermediate image could be digitally restored into clear one. This technique shows wonderful re- sults in extending the depth of focus (Cathey and Dowski, 2002; Gómez-…  相似文献   

Ant colony system algorithm for the optimization of beer fermentation control     

肖杰  周泽魁  张光新 《浙江大学学报(A卷英文版)》2004,5(12):1597-1603

Beer fermentation is a dynamic process that must be guided along a temperature profile to obtain the desired results. Ant colony system algorithm was applied to optimize the kinetic model of this process. During a fixed period of fermentation time, a series of different temperature profiles of the mixture were constructed. An optimal one was chosen at last. Optimal temperature profile maximized the final ethanol production and minimized the byproducts concentration and spoilage risk. The satisfactory results obtained did not require much computation effort.  相似文献   

关于我国研究生教育层次结构优化的若干思考   总被引：5，自引：0，他引：5  

王根顺  包水梅 《教育科学》2006,22(4):70-73

文章以阐述研究生教育层次结构优化的标准为基础,对我国研究生教育层次结构的发展现状与问题进行了定量分析,并指出了优化我国研究生教育层次结构全过程中必须注意的问题,提出从总体上控制一个合理的比例关系、实行研究生培养单位的任务分工、实施研究生教育形式的多样化、分别不同科类不同专业调整研究生教育层次等是优化我国研究生教育层次结构的基本对策。  相似文献   

Optimization of conditions for supercritical fluid extraction of flavonoids from hops (Humulus lupulus L.)     

He GQ  Xiong HP  Chen QH  Ruan H  Wang ZY  Traoré L 《Journal of Zhejiang University. Science. B》2005,6(10):999-1004

Waste hops are good sources of flavonoids. Extraction of flavonoids from waste hops (SC-CO₂ extracted hops) using supercritical fluids technology was investigated. Various temperatures, pressures and concentrations of ethanol (modifier) and the ratio (w/w) of solvent to material were tested in this study. The results of single factor and orthogonal experiments showed that at 50°C, 25 MPa, the ratio of solvent to material (50%), ethanol concentration (80%) resulted in maximum extraction yield flavonoids (7.8 mg/g). HPLC-MS analysis of the extracts indicated that flavonoids obtained were xanthohumol, the principal prenylflavonoid in hops. Project (No. Y304203) supported by the Natural Science Foundation of Zhejiang Province, China  相似文献   

网络日志中查询串语义关系挖掘及其应用研究     

段建勇  徐骥超  张梅 《现代图书情报技术》2012,(1):58-62

通过挖掘网络日志中的查询词语义关系,将《知网》的语义知识加入到聚类算法中实现搜索引擎优化。该方法通过机器学习算法深入挖掘查询日志,对其中的查询串进行概念相似度、语义聚类等计算,使返回网页更加合理,将更准确的网页结果呈现在用户面前,能够更好地满足用户需求。  相似文献   

Optimization of succinic acid fermentation with Actinobacillus succinogenes by response surface methodology (RSM)     

Yun-jian Zhang  Qiang Li  Yu-xiu Zhang  Dan Wang  Jian-min Xing 《Journal of Zhejiang University. Science. B》2012,13(2):103-110

Succinic acid is considered as an important platform chemical. Succinic acid fermentation with Actinobacillus succinogenes strain BE-1 was optimized by central composite design (CCD) using a response surface methodology (RSM). The optimized production of succinic acid was predicted and the interactive effects between glucose, yeast extract, and magnesium carbonate were investigated. As a result, a model for predicting the concentration of succinic acid production was developed. The accuracy of the model was confirmed by the analysis of variance (ANOVA), and the validity was further proved by verification experiments showing that percentage errors between actual and predicted values varied from 3.02% to 6.38%. In addition, it was observed that the interactive effect between yeast extract and magnesium carbonate was statistically significant. In conclusion, RSM is an effective and useful method for optimizing the medium components and investigating the interactive effects, and can provide valuable information for succinic acid scale-up fermentation using A. succinogenes strain BE-1.  相似文献   

香港教育评核的方法、特点及其对优化内地基础教育质量监测与督导制度的启示     

何穆彬 《考试研究》2012,(2):77-86

香港是中西文化交融之地,不仅拥有高水平的教育体系,而且建立了科学系统的教育评估方法。本文重点介绍香港目前中小学主要的教育评核制度,包括全港性系统评估、学生评估和中小学校表现评估等,评论其对香港学校教育教学质量的影响。借鉴香港教育评核的经验,实施科学的教育评价对于深化内地基础教育改革,建立、优化符合内地实际的教育质量的评估与督导制度具有重要的参考意义。  相似文献