Software implemented fault injection for distributed real time systems

Aiming at the problem of dependability validation in the distributed real time systems, the universal fault model is established, which is classified into four groups: memory fault, CPU fault, communication fault, and service fault. A software implemented fault injection architecture (SWIFIA) for the distributed real time systems is proposed, which is classified into three levels: target system, communication network, and software implemented fault injection system (SWIFIS). The SWIFIS is designed with three parts: software implemented fault injector, data collection module, and fault data analysis module. The process of software implemented fault injection based on the architecture is illustrated. SWIFIS is implemented and analyzed with experiments. The major faults detected in the experiments are communication faults, memory faults, and CPU faults while the coverage rates were 37.68%, 15.47%, and 15.17%, respectively. The experimental results demonstrate that this architecture is suitable for the applications under distributed real time environment. They offer theoretical base and evidence for further research of software dependability validation.     

Tool path planning and geometry simulation for multi axis CNC belt grinding

Belt grinding machine with multi axis computer number control(CNC) system can effectively process parts with complex moulding surfaces.In this paper,iso parametric and iso planar tool path planning strategies customized for this kind of machine are proposed.The tool path generation methods are designed based on the analysis of the belt grinding process.By using least square method,optimized cross section normal is computed in the iso planar method.To improve the design efficiency of path planning,reduce experiments and increase economical benefit,the geometric simulation program based on linear grinding model is developed.Experiment on a turbine blade profile shows that the proposed algorithms work satisfyingly.     

Analysis of Interpolate-compensation Component of Open CNC System Based COM

CNC system is gradually developing toward flexible, component modular and re-configurable of open CNC system's structure. It's beginning a research direction in open CNC system with the software reuse and re-configurable technology. Based on the expound of concepts and characteristics of component technology, open CNC system's characteristics are analyzed based on COM and open CNC system is divided into several components. With the characteristics of binary language irrelevant, thread transparent, re-configurable and normative interface of COM technology, open CNC system's interpolate-compensation component in interpolate-compensation component achieved, interface designed and object created are researched. Better effects are achieved by connecting the interpolate-compensation component with the other CNC components. At the same time, the CNC component's real-time control problem is analyzed.     

Development of Software Reuse Technology in Industrial Control Software Area

This paper briefly introduces the contents and characteristics of the software reuse technology and industrial control software. The development of the software reuse technology in industrial control software area is discussed emphatically. Then the article brings forward a kind of thought that establishes standard element class library and develops the application program frame adapts to industrial control area. Namely, they are the establishment of the reuse of standard element class library based on the level of class library, the design of the reuse of the program frame based on the level of design, the amelioration of the reuse of the designing method based on the level of analysis. This thought improves on design method of industrial control software and is applied in the real-time monitoring system for the high-press water pump station.     

Power transformer fault fusion diagnosis using FMADM theory

Large oil-immersed power transformer fault diagnosis is always directed at preventive test data, the preventive test data can not be got immediately, otherwise, it must be waited until power off and maintenance time. On the other hand, the accuracy and quantity for the field data collection is always limited. However, the symptoms phenomenon is a summary of a great deal experiences, to some extent, it can reflect the failure of transformer. Therefore, an idea that integrates both of the preventive test data and the symptom phenomenon in the transformer fault diagnosis is proposed. Through this method, all kinds of information can complement each other. First, the diagnosis to symptoms phenomenon is realized by introducing fuzzy multi-attribute decision making (FMADM) theory. Then, by adopting the fuzzy probability model, the failure probability of the preventive tests data is calculated. Finally, through D-S evidence theory, the results of the preventive test data and the symptom phenomenon can be integrated. The paper gives a novel diagnosis model which can be used as a kind of effective means through the given example.〖JP〗     

Quantitative modeling and application of CNC machine failure distribution curve

To quantitatively study the distribution curve of CNC machines, the Weibull linear regression using the failure data of CNC machines is analyzed. As the result of analyzing WPP(Weibull probability plot), the failure rate distribution curve which includes early failure period and random failure period is established by piecewise twofold Weibull model. The establish method of the model and the process of parameter estimated by maximum likelihood are explained. The correctness of the model is verified by comparing the lasting time of early failure period with the actual situation. The optimization warranty of CNC machines is obtained by an object function which is established by the model.     

采动影响下逆断层特征参数对断层活化的作用规律

笔者分析了采动影响下断层滑移的主要影响因素,以数值模拟为研究手段,利用FLAC 3D建立了逆断层简化模型,分析了不同断层倾角、不同落差及采掘工作面与断层不同距离的断层带附近煤岩体弹性能、断层面正应力与剪应力、断层滑移量的变化规律,从而揭示了采动影响下逆断层特征参数对断层活化的基本作用规律。研究结果表明：上盘或下盘开采,断层带附近煤岩体弹性能集中程度随工作面与断层距离的增大而降低,随断层倾角及落差的增加而增大,但下盘开采对断层带的能量集中程度较上盘高。下盘开采时剪应力较上盘显著增加,但正应力变化较小,易于断层活化。上盘或下盘开采,随工作面与断层距离的增加,断层滑移量减小。上盘开采,随断层倾角增大,断层滑移量增加;随断层落差增大,断层滑移量减小。下盘开采,随断层倾角增大,断层滑移量减小;随断层落差的增大,断层滑移量增加。     

The configuration location designation of variable message signs

This paper mainly focuses on the configuration location designation of variable message sign. The random error term of Probit traffic assignment model stands for the difference between roadway situation and traveler’s expectation and it has an effect on the assignment result. Different assignments result in different roadway network situations. In this paper,the BPR function and HCM2000 signalized intersection delay model are taken to evaluate the roadway network operations and variable message sign locating procedure is also set up. A4×4 roadway network is taken as the numeral sample and the best location of variable message signs are determined. Based on the method mentioned above,the influence of information coverage on the roadway network operations and the influence of information accuracy on the roadway network operations are discussed. The results show that the total expected roadway network travel time tends to decrease with the expansion of information coverage and improve of the information accuracy.     

High impedance fault identification method of distribution network

High impedance fault is always difficult to be identified due to its unobvious fault signature and difficult detection. This paper decomposes the transient signal in multi-scale by utilizing the good localization performance of the wavelet in both time domain and frequency domain,reconstructs the wavelet coefficients under each scale,takes the wavelet reconstruction coefficient under the scale of 3,calculates the size spectrum of each feeder line in timing floating window and identifies the circuits in which the faults lined according to the value of the size spectrum. A high impedance fault simulation system is built based upon the study of the various transient signals in power systems,and the high impedance fault simulation analysis of the distribution feeder is undertaken through PSCAD simulation platform using high impedance fault model. Simulation analysis shows that the method can effectively extract the feature of high impedance fault on high impedance fault identification.     

Novel method for fault line selection in arc suppression coils system using transient energy

In order to overcome low sensitivity of the protection based on transient components when the faulty voltage passes zero, regarding arc suppression coill branch as a healthy feeder line, using the relation of its transient energy and all feeders of transient energy amounting to zero, this paper presents an improved fault line selection method in arc suppression coils system using transient energy. This method has no requirements of detection fault close angle and pre setting, has a good anti interference ability and adaptability to various faults occurred in the systems with arc suppression coils. Large amount of digital simulation results show that the proposed method is effective and reliable.     

The Software System for Computation and Drawing of Ship Properties

The softwa re system suggested in this paper is applied to replace the traditionalhanded-computation forms. It uses the cubic sample interpolation and numerical integral,and is writ-ten with FORTRAN according to the accurate formula. With this software system,the nine sorts ofcomputation results of ship properties can be obtained. The system is con nected through SCR filewith AutoCAD,and ean draw automatically eleven sorts of pictures according to the computation re-sults.     

Chromosomal location of genes for supernumerary spikelet in bread wheat

The supernumerary spikelet (SS) character of bread wheat (Triticum aestivum L.) is an abnormal spike morphology expressing extra spikelets per spike. Chromosomal location of the genes for the SS character in the bread wheat line, Yupi Branching was determined by monosomic analysis. The normal-spiked bread wheat Chinese Spring monosomic series were used as testing lines. Data indicated that chromosomes 2D, 4A, 4B and 5A of bread wheat carry genes for SS character (bh genes). Among them, the gene on chromosome 2D has the strongest effect on the expression of the SS character. Comparison of disomic and monosomic plants in 2D, 4A, 4B and 5A F₂ populations revealed that the bh genes are hemizygous-effective and dosage-independent. The F₁ monosomic analysis showed that the bh genes of Yupi Branching are recessive. This revised version was published online in August 2006 with corrections to the Cover Date.     

The importance analysis of tool magazine fault and its reliability improved design

The reliability level of tool magazine is an important indicator to show how advanced a horizontal machining center is. To more effectively promote the reliability level of tool magazine,a new method combining importance and structure optimization is introduced. Taking tool magazine of a horizontal machinging as object, the fault tree of a tool magazine is established based on 35 failure data obtained from a horizontal machining center. Important levels of elementary events are calculated by fault tree analysis,and the order of importance is determined based on importance values. An improved design of structural reliability for elementary events with great importance is made according to failure principles and tool changing process. The feasibility of the improved design is verified by the designer of the tool magazine.     

design of an equipment condition monitoring and fault diagnosis network system for the main drive of a hot strip mill

A new distributed equipment condition monitoring and fault diagnosis network system based on an RS485 field bus and an industrial ethernet was designed for the main drive system of a hot strip mill. The system structure and composition were studied. The following problems were resolved: communication of an intelligence data acquisition module with RS485 interface; communication between a server, clients and a light emitting diode; and point to point communication between a programmable logic controller and server. Real time signals of 24 radial run out, 12 axial drifting can be synchronously acquisitioned and stored in a database. System operation is satisfactory and can be used to identify the causes of rolling mill halt and transmission slip brake, and to improve sheet metal quality.     

若干蓝莓品种适应性模糊综合评价

为了更好地利用浙江省临安地区的农业气候资源,进一步优化新农村种植业产业结构,达到趋利避害,适地适树的目的,以定植于浙江农林大学官塘基地10个蓝莓品种为试材,对各品种的存活率、树体性状（包括株高、冠幅、基部分枝数、根茎粗、叶片鲜重、干重、叶面积、花芽数、叶芽数、初花期等指标）进行测定,根据模糊数学基本原理,综合评价各品种适应性。研究结果表明,‘圆蓝’、‘粉蓝’在临安地区的适应性最好,可作为推广品种;‘夏普蓝’、‘精华’、‘顶峰’适应性稍差;‘芭尔德温’、‘杰兔’、‘密斯特’、‘灿烂’、‘奥尼尔’则表现不适应性。     

Comparison and Analysis of Resource Assigning in Project Management Software

The resource management modes of MS project,P3,Sware software and Morrow software have been compared and analyzed from some aspects such as resource system,resource distribution,calendar of resource,dominant resource,resource cooperation,human resource, risk of resource and resource optimization.In addition,applicable conditions of the project management software and some problems on application of the software have been discussed.     

The optimized Gabor window spectrum of gear fault diagnosis detection

There is a lot of non-stationary signals in gear vibration signals,which is analyzed by using Gabor spectrum. To resolve the problem of the choice of window,a method based on entropy is proposed to select the optimal Gabor window width,and the time-frequency resolution of Gabor transform is improved. Since the spectrum has its specific mechanism of crossing-item,the Gabor spectrum is calculated in the region of the key support area and the crossing-item is effectively removed,then the Gabor spectrum is used to analysis the time-frequency distribution of vibration signals of gear,and this method is compared with traditional analysis methods. The result shows that the Gabor spectrum can intuitively react abnormal gear and energy changes with time,and easily diagnose the gear fault.     

Chromosomal location of factors affecting content and composition of non-starch polysaccharides in wheat-rye addition lines

Summary Content of dietary fibre (DF) as well as content and composition of non-starch polysaccharides (NSP) were evaluated in disomic wheat-rye addition lines and octoploid triticale compared to their parental species — wheat (Grana) and rye (Dakowskie Zote). Large variation in the contents of NSP and DF were observed in the wheat-rye addition lines, especially in the soluble fractions. The double addition of rye chromosomes led to important transgression effects on content and composition of DF in wheat grain. Chromosomes 2R and 5R increased SDF content above the rye level, whereas the 3RS arm decreased SDF content below the wheat level. The octoploid triticale demonstrated the highest content of total arabinoxylan (AX), exceeding that of rye, while the double addition of chromosomes 4R, 6R and 6RL had an impact on high expression, comparable to that of rye content of total AX in wheat grain. Chromosomes 2R and 5R notably increased the proportion of soluble non-cellulosic glucose in the NSP fraction, in contrast to the rest of wheat-rye addition lines, octoploid triticale, wheat and rye, where AX was found to be predominant among NSP constituents. The effects of single chromosome pairs on content and composition of NSP proved to be higher than the effect of the whole rye genome in octoploid triticale. The most remarkable effect, especially considering the direction of changes, was of a 3R chromosome short arm addition. The obtained data might be of interest in breeding rye or triticale with lower viscous AX content as well as rich in soluble non-starch glucose polymers, regarded as a corrective factor in modern diseases.Abbreviations AX arabinoxylan - CV coefficient of variation - DF dietary fibre - IDF insoluble dietary fibre - NSP non-starch polysaccharides - SDF soluble dietary fibre - TDF total dietary fibre - TFA trifluoroacetic acid