我国村镇银行的声誉风险形成及防范研究     

敬志红  周晓燕 《梧州学院学报》2014,(1):6-9

村镇银行作为新型农村微小金融机构,经营业务的主要范围是商业银行的传统存贷业务。村镇银行产生声誉风险的主要原因在于资经营时间短,资本规模小、公司治理水平较低和显性存款保险制度缺失等。必须从增加资本规模、完善公司治理水平、尽快建立显性存款保险制度等方面入手,提高村镇银行的盈利能力和服务水平,增加客户对村镇银行的认可度,以促进村镇银行的可持续发展。  相似文献   

数控教学中的产教结合研究     

张猛 《天津职业院校联合学报》2014,(12):77-79

数控课程发展的特点和数控在机械制造业中的广泛应用,需要数控教师的能力有新的提升。结合数控教学的培养目标和市场的需求,提出教师在进行数控教学时要采取适当激励手段,提高数控教学的教学效果,激发学生的操作兴趣。  相似文献   

基于多重调谐质量阻尼器的苏通大桥抖振位移最优控制的数值模拟     

Hao WANG Tian-you TAO Huai-yu CHENG Ai-qun LI 《浙江大学学报(A卷英文版)》2014,(10):798-812

研究目的：为超大跨度斜拉桥抗风设计与抖振控制提供参考。研究方法：基于ANSYS建立了苏通大桥三维有限元模型,并在MATLAB平台模拟了苏通大桥三维脉动风场。考虑主梁断面气动自激力,进行了苏通大桥抖振时域分析。根据苏通大桥动力特性和抖振时域分析结果,重点分析了多重调谐质量阻尼器（MTMD）用于抖振控制的参数敏感性。考虑MTMD的控制效果、建造费用、施工难度及鲁棒性等因素建立了关于MTMD设计参数的目标函数,并基于一阶优化算法进行目标函数最优解的非线性搜索,据此获得了MTMD在约束条件下的最优设计参数。重要结论：1.苏通大桥侧向抖振位移主要由第一阶侧弯振型控制,竖向抖振位移主要由第一阶竖弯振型控制;2.MTMD的控制效果对设计参数的变化十分敏感,其中质量比和频带宽敏感性更强;3.MTMD的最优设计参数可以通过一阶优化算法获得,并可通过零阶优化算法对优化结果进行验证;4.采用优化后的MTMD设计参数,苏通大桥的抖振响应可以得到明显抑制,且侧向抖振控制效果更加明显。  相似文献   

加强内部控制,提高办学效率     

李凤荣 《天津职业院校联合学报》2014,(12):43-46

高校科学发展,就要把勤俭办学作为一种精神内核、一种创业动力、一种基本品格和永恒追求。加强内部管理,建立健全内控制度是建设节约型校园的关键所在。主要从货币资金的管理与控制、实物资产的管理与控制、采购环节的管理与控制、工程项目的管理与控制、科研课题项目控制等五个方面就高校内控制制度的建设进行探讨与研究。  相似文献   

NLMS算法在有源降噪系统中的应用     

刘姜涛  徐辉 《培训与研究》2014,(2):25-27

本文分析了自适应算法的原理,研究了最小均方（LMS）算法和归一化最小均方（NLMS）算法的区别,给出了有源噪声控制的仿真系统,并进行了仿真实验,在输入信号变化较大时,NLMS算法也能够维持稳定,并比LMS的收敛速度快.  相似文献   

自动控制原理课程中工程对象教学法的应用     

谭永丽 《培训与研究》2014,(2):47-49

自动控制原理课程由于其涉及知识面广、理论性强、思维抽象等特点,一直都是难教、难学的课程.传统的教学方式偏重理论讲解,缺乏与实际问题结合的创新实践环节.本文提出工程对象教学法,按任务驱动的模式分解课程的知识点,采用讲练结合、分组讨论的创新模式学习,能有效地激发学生的学习热情、提高学生的综合分析能力、增强学生运用自动控制原理解决实际工程问题的能力.  相似文献   

Real-time temperature control for high arch dam based on decision support system   总被引：1，自引：0，他引：1  

井向阳  刘杏红  周伟  常晓林 《天津大学学报(英文版)》2014,20(2):118-125

It is important and difficult to control the temperature of mass concrete structure during high arch dam construction.A new method with decision support system is presented for temperature control and crack prevention.It is a database system with functions of data storage,information inquiry,data analysis,early warning and resource sharing.Monitoring information during construction can be digitized via this system,and the intelligent analysis and dynamic control of concrete temperature can be conducted.This method has been applied in the construction of the Dagangshan Arch Dam in China and has proven to be very convenient.Based on the decision support of this system and the dynamic adjustment of construction measures,the concrete temperature of this project is well-controlled.  相似文献   

Robust Adaptive Control Design for Rotorcraft Unmanned Aerial Vehicles Based on Sliding Mode Approach     

郭建川  鲜斌 《天津大学学报(英文版)》2014,(6):393-401

This paper presents a nonlinear robust control design method for a generic rotorcraft unmanned aerial vehicle（RUAV）. The control objective is to let the RUAV track some pre-defined time-varying position and headingtrajectories. The proposed controller employs feedback linearization process to realize the dynamic decoupling controland applies adaptive sliding mode control to compensate for the parametric uncertainties and external disturbances.The global asymptotical stability is proved via stability analysis. Compared with the cascaded controller, the proposedcontroller demonstrates a superior tracking performance and robustness through numerical simulation in the presenceof parametric uncertainties and unknown disturbances.  相似文献   

Energy Performance and Condensation Risk of DCDV System in Subtropical Hong Kong简     

贾捷  李慧玲 《天津大学学报(英文版)》2014,20(1):42-47

The combined use of dry cooling （DC） system and dedicated ventilation （DV） system to decouple cool-ing and dehumidification process for energy efficiency was proposed for subtropical climates like Hong Kong. In this study, the energy performance and condensation risk of the use of DCDV system were examined by analyzing its ap-plication in a typical office building in Hong Kong. Through hour-by-hour simulation using actual equipment per-formance data and realistic building and system characteristics, it was found that with the use of DCDV system, the annual energy consumption could be reduced by 54%in comparison with the conventional system （constant air vol-ume with reheat system）. In respect of condensation risk, it was found that the annual frequency of occurrence of con-densation on DC coil was 35 h. Additional simulations were conducted to examine the influence of different parame-ters on the condensation risk of DCDV system. Measures to ensure condensate-free on DC coil were also discussed.  相似文献   

Life extending control of helicopter based on dynamic inversion     

刘晶  吴爱国 《天津大学学报(英文版)》2014,20(3):215-222

The purpose of using life extending control for Black Hawk UH-60 helicopter is to make a trade-off between the handling qualities and the service life of critical components. An increase in service life span results in enhanced safety and the reduction in maintenance costs. This paper presents a design methodology of life extending control for structural durability and high performance of mechanical system, which is based on an explicit dynamic inversion control scheme. A real-time nonlinear fatigue crack growth model is built to predict fatigue damage resulting from the impact of cyclic bending stress on rotor shaft, which serves as an indicator of service life. The 4-axis gain- scheduled flight controller, whose gains are adjusted as a function of damage and flight velocity, is designed to regu- late roll attitude, pitch attitude, vertical velocity and yaw rate. The nonlinear system simulation results show that the responses can meet the requirements on ADS-33 Level 1 handling qualities and that the 4-axis decoupling control is realized. As the damage increases, the tracking performance is slightly degraded, which results in smaller transients in bending moment response.  相似文献