STATE VARIABLE METHOD FOR DYNAMIC SIMULATION OF HVDC SYSTEMS     

Zhang Wei Ren Zhen Qin Yihong Liao Qing 《保鲜与加工》1990,(1):56-62

A flexible mathematical model used for dynamic simulation studies of HVDC systems which is based on the stale variable method is presented, and the correspongding computer program has been implemented. Generality, easy to use, and suitable to run on microcomputers are the main features of the model and the computer program. Therefore the model is easy to be extended for application. An example is given in the paper to verily the coneclness of the model and the program.  相似文献   

A NEWFANGLED NORMATIVE FORM FOR SINGLE EIGENVALUE SYSTEMS     

Wang Jifeng Dept.of Mechanical  Electrical Engineering 《保鲜与加工》1992,(1)

  相似文献   

A CALCULATION OF THE ECCENTRICALLY LOADED BRICKWORK WITH BIAXIAL BENDING IN TERMS OF ULTIMATE STRENGTH DESIGN METHOD     

Zhang Deshan 《保鲜与加工》1988,(2)

This paper suggests a calculation formula for eccentrically loaded brickwork or column with biaxial bending in terms of ultimate strength design method. The coefficients of the formula, are compiled as design charts so that the formula can be directly used for design of this kind of structural members.  相似文献   

The Control Strategy for the Excitation System of Asynchronized Turbogenerators     

He Yaosan Lin Jingdong Tang Zhuoyao Tong Mingru 《保鲜与加工》1995,(5):7-12

In this paper, the excitation principle and operating characteristics ofasynchronized turbogenerators are analyzed,and adaptive tracing iterative control strategy based on state identification is proposed. In order to apply this control scheme to practice engineering, some primary elements are analyzed and presented for constituting dual-channel automatic excitation control system of asynchronized turbogenerators. Finally, the paper presents the principle structure charts about excitation control system of asynchroized turbogenerators.  相似文献   

An EOQ Model at Random when Average Demand Is a Linear Increasing Function     

LUO Bing  YANG Xiu Tai  XIONG Zhong Kai 《保鲜与加工》2002,(5):131-135

For certain types of inventory, the ordering cycle and demand may be random variants, which satisfy certain types distribution. The classical EOQ model usually neglects the fact. Based on the constant demand, under the hypothesis that the ordering cycle is a random variant which satisfies exponent distribution, average demand is a linear increasing function, this paper considers the effects of the time-value of capital and inflation on replenishment strategy of inventory system. Loosening the condition of basic economic order quantity model under deterministic state, the total cost function of the model is provided. The optimum order quantity and cycle are obtained. The application range of EOQ model under the constant demand is widened. The theoretical evidence is provided for the inventory system to make management decision.  相似文献   

车用永磁式缓速器研究现状与展望     

赵小波  周俊  姬长英  黄亦其 《拖拉机与农用运输车》2007,34(5):6-8,10

概述了车用永磁式缓速器的研究意义、工作原理及特点,着重阐述了车用永磁式缓速器的国内外研究现状;分析了永磁式缓速器研究过程中存在的问题,并针对问题提出了未来研究重点和发展趋势。  相似文献   

活塞组机械疲劳试验的有限元仿真     

刘永启  王延遐  门秀花  林风华  张运泰 《拖拉机与农用运输车》2006,33(4):20-22

对某铝合金活塞在机械疲劳试验机上做的疲劳试验进行有限元分析,为活塞的改进设计提供依据。采用装有活塞销的三维整体活塞有限元模型,应用接触单元模拟实际情况,对活塞在交变机械载荷作用下的应力和应变进行了计算,找出了危险点部位,计算结果与试验吻合。  相似文献   

半固定管道式喷灌系统移管机行走轮平衡状态的研究   总被引：2，自引：0，他引：2  

王玉昆  关志刚  荀杰 《排灌机械》2003,21(1):29-32

对半固定管道式喷灌系统移管机运行过程中的平衡问题进行了分析研究，建立了运动时行走轮稳定状态的数学模型，论证了研制移管机的可行性。  相似文献   

高效产氢发酵细菌在不同气相条件下产氢   总被引：12，自引：0，他引：12  

林明  任南琪  王爱杰  马放 《中国沼气》2002,20(2):3-7,23

气相条件是影响高效产氢细菌产氢能力的重要生态因子之。间歇实验结果表明，空气中的氧分子是抑制高效产氢细菌－B49生长发酵的直接原因，二氧化碳也对B49的发酵产氢产生很大的抑制作用，而以氮气和氩气为气相能使B49发挥较高的产氢能力，氮气很可能对B49的发酵产氢有一定的促进作用。  相似文献   

有机废水产酸发酵的生理生态学分析   总被引：9，自引：0，他引：9  

任南琪  王宝贞 《中国沼气》1995,13(1):1-6

通过对产酸发酵细菌细胞内生物物理化学及发酵途径分析表明，控制生物产酸发酵类型的主要因素有ＮＡＤＨ／ＮＡＤ＋平衡和发酵产物酸性末端数量。根据微生物的生理生态学原理及试验结果分析，证实所发现的乙醇型发酵优于丁酸型发酵和丙酸型发酵。此外，还对氢分压与丙酸积累的相关性提出新的见解。  相似文献