高校《大学计算机基础》教学的思考与建议

《大学计算机基础》课程是高校非计算机专业学生必修的一门公共基础课。文章针对高校《大学计算机基础》课程的教学现状,分析了目前存在的一些问题并提出了对该课程教学的几点建议

CAPP Design of Cylindric Gear of Involute

现代化工业对产品的功能结构及更新换代周期提出了越来越高的要求.因而只有采用先进的产品设计手段和方法,不断提高对产品的创新,才能满足社会发展的要求.通过对CAPP技术的研究,根据渐开线圆柱齿轮设计的基本理论,开发了齿轮CAPP系统,同时也一并介绍了系统的总体架构以及主要模块的设计方法.With the development of industry modernization at top speed,the function and structure of products are becoming better and the periods for their renewing and replacing are forced to become shorter.Therefore,we must accept the modernized method of design,spread and apply the CAPP technology and improve the ability of innovation on products to accord with the requirement of the development of society.This thesis is about the research on the CAPP technology.Based on the design theory of cylindric gear of involute,the CAPP system is developed and at the same time,the author introduces the design method for the main functional modulars

Design and verification on air inflow correction system of FSAE engine

针对限制器引起的进气管内压力损失会增加赛车实际油耗的问题,该文以单缸四冲程赛车发动机为研究对象,从混合气体空燃比控制、喷油量的控制和进气量测量3个方面分析了电喷系统,结合电喷系统的特点建立了进气量修正方案,在此基础进行了控制单元的硬件和软件设计。通过对发动机喷油脉宽的检测验证了进气量修正控制单元满足设计要求,达到了降低油耗、提高赛车竞争力的目的。In view of that the pressure loss in the air inflow pipe caused by the resrtictor makes the actual fuel consumption relatively increaseing,the four-stroke engine of the formula SAE car is investigated here.The electronic fuel injection(EFI) system is analyzed from three aspects of the air-fuel ratio control of the mixed gas,the control of fuel injection quantity,and the measurement of air inflow.According to the characteristics of the EFI system,the air inflow correction scheme is designed, and the hardware and software of the control unit are accomplished.The test of pulse-width of EFI system shows that the control unit of air inflow correction can meet the design requirements,reduce the fuel consumption,and improve the competitiveness of the FSAE.国家自然科学基金(51305372

Study on Highway Road Detection Based on Computer Vision

根据高速公路路面的基本特征,通过分道线特征点投影位置的计算,提取出了比较完整的当前车道分道线特征点。建立道路边缘灰度模型,采用gAbOr变换多分辨率的特点,对图像按方向进行滤波处理,实现道路边缘线检测和拟合。实验结果表明,所讨论的方法在工程实践中有实际应用价值。According to the basic characteristics of the road and through marginal extraction,the location of current lane line can be acquired.After calculating projection location of the lane feature points,feature points of a relatively complete current lane dividers can be distilled.Establishing the model of road edge grey scale and adopting the multi-resolution characteristics of Gabor transform,they can filter the image so that they can realize the detection and fitting of the road edge line.Experimental results show us that the method discussed in this text has a certain value in practice.福建省青年科技人才创新项目(2006F3121

Semi-active Suspension Anti Rollover Control for Bus Using Fuzzy Sliding Mode Theory

为了提高客车的防侧翻能力,建立了4自由度的客车整车动力学模型,并以此为基础设计了半主动悬架防侧翻控制器,提出了一种基于半主动悬架的模糊滑模控制策略.在MATlAb/SIMulInk环境下进行了仿真计算,仿真结果表明:采用所提出的模糊滑模控制策略,可以有效地降低汽车非直线行驶时的侧倾角以及侧倾角速度,提高汽车的侧翻稳定性,降低汽车侧翻事故发生可能性.For purposes of improving the ability of anti rollover for buses,a 4degree of freedom bus rollover dynamics model is established,and a fuzzy sliding mode control strategy is proposed based on semi-active suspensions for buses.Under MATLAB/SIMULINK,simulations are conducted.Results show that the proposed control scheme not only can reduce roll angles and roll angular velocities,but also can improve the roll stability of buses and reduce the possibility of bus rollover accidents.国家自然科学基金(51305372

Research on Anti-collision Safe Running of Vehicle on Highway

为了提高在高速行驶状态下的车辆主动安全性能,并针对高速公路上汽车追尾事故发生的特点,以汽车制动过程为分析基础,得到3种不同的安全车距计算方法.利用MATlAb对干燥路面状况下的车速与安全车距的关系进行仿真.仿真结果表明,其符合国家对机动车运行安全的要求.在此基础上,研究了汽车防追尾安全行驶的控制与执行,最后提出了基于不同影响因子的安全车距等级预警方法.To improve initiative security of vehicle at high speed,according to the characteristics of the accident of highway vehicle,three different safe vehicle gap can be obtained on the basis of the analysis of a vehicle braking process.It can be emulated by using matlab so as to understand fully the relationship between vehicle speed and safe gap at dry road conditions.The simulation results show that the safe running requirement of the vehicle can be acquired.And then the process of the control and implementation of safe running was investigated.Finally the method of warning of safe vehicle gap was advanced based on the level of security of the proposed factor

Simulation and Experiment Research on Improving Fuel Economy of Engine for FSAE

fSAE比赛要求赛车发动机气缸的进气都必须安装限制器,但进气量限制器降低了发动机最大的进气量和燃料的燃烧速率,造成了进气管内的压力损失,从而导致赛车的实际油耗相对增加.以单缸四冲程赛车发动机为研究对象,利用AVl bOOST分析软件对所建立的fSAE赛车发动机模型进行仿真,分析限制器造成的进气管内的压力损失以及对发动机功率、充气效率和燃油消耗的影响,根据分析结果结合电喷系统的特点建立了进气量修正方案.最后通过对发动机喷油脉宽的检测,验证了进气量修正控制单元满足设计要求,从而达到了降低油耗、提高赛车的竞争力的目的.In order to limit the maximum output power of formula society of automotive engineers(FSAE)car′s engine,a single circular restrictor is required to be installed at the engine.But the restrictor lowers the air flow speed and fuel burning rate,and the pressure of intake pipe declines.In this paper,the four-stroke engine of the FSAE car was investigated.We analyze the influence of intake restrictor on engine power,intake pipe′s pressure,volumetric efficiency and fuel consumption.One-dimensional engine cycle will be simulated by using AVL BOOST.Intake quantity correction was designed based on the characteristics of electronic fuel injection(EFI)system and analysis results.According to pulse width of driving signal for injecting fuel,the performance of FSAE car′s engine was improved by intake quantity correction of the control unit.Fuel consumption decreases,and fuel economical efficiency is improved.This research has provided an alternative method in order to improve the competitiveness of FSAE car with practical significance.国家自然科学基金(51305372); 国家公派出国留学项目(201306315012

H∞ Anti-rollover Control of Active Suspension in Vehicle Based on LMI Theory

提出了一种基于主动悬架的H∞控制策略。在MATlAb/SIMulInk环境下进行了仿真计算,仿真结果表明:采用所提出的H∞控制策略,可以有效地降低汽车非直线行驶时的侧倾角以及侧倾角速度,提高汽车的侧翻稳定性,降低汽车侧翻事故发生可能性。H control strategy is proposed based on active suspensions for vehicle.Under the Matlab/Simulink,the simulation is done and the results show that the presented control scheme not only can reduce the roll angle and roll angular velocity,but also can improve the rollover stability of the vehicle and reduce the possibility of vehicle rollover accident.国家自然科学基金资助项目(51305372

Research on Vehicle Rollover and Control

Conference Name:2nd IEEE International Conference on Advanced Computer Control. Conference Address: Shenyang, PEOPLES R CHINA. Time:MAR 27-29, 2010.Rollover is one of the main traffic accident forms for vehicle. According to the datas recently, rollover has become the second most serious accident. However, the study on rollover in China is at the beginning. The study on vehicle rollover is based on the theories of rollover. In order to optimize vehicle configuration, and enhance vehicle rollover stability, and ensure the road safety, rollover model is proposed and simulated in computer. Besides, the reasons that have effect on rollover are analyzed in detail. The final result can provide a scientific basis for the optimization of the vehicle's structure and improve the stability of vehicle rollover. Furthermore, some active control systems with rollover prevention are analysized and proposed. At last, the effective control system and the project how to achieve it are provided

Psychological flexibility training for career adaptability improvement among second-year middle-school students

目的检验基于接纳承诺疗法青少年心理灵活性模型(DNA-V)的心理课程训练对中学生心理灵活性和提高生涯适应力的效果,为服务中学生心理健康提供参考方案。方法与北京某中学合作招募初二学生110名,以班级为单位随机分为DNA-V面授组(线下组,33名)、DNA-V网络组(线上组,40名)、学校常规心理组(对照组,37名),将DNA-V的干预方案本土化为6个学时的中学DNA-V心理课程。采用青少年回避与融合问卷和生涯适应力量表在干预前、干预后1周、干预后2个月测评被试的心理灵活性、生涯适应力变化。结果采用线性混合模型进行分析,并控制了人口学变量后,线下组的心理灵活性和生涯适应力在干预后1周和干预后2个月的水平均高于干预前(心理灵活性t值分别为4.22,3.11;生涯适应力t值分别为3.05,4.16,P值均&lt;0.01),而干预后1周与干预后2个月之间差异无统计学意义。线上组的心理灵活性和生涯适应力在干预前、干预后1周、干预后2个月的水平差异均无统计学意义。对照组的心理灵活性和生涯适应力从干预前到干预后1周均有提升(t值分别为4.64,2.47,P值均&lt;0.05),但干预后2个月又降回与干预前接近的水平。结论DNA-V面授心理课程对心理灵活性和生涯适应力的提升作用都具有至少2个月的长时程保持效果。</p