Study and Analysis of Bus Arbitration Mechanism in PI-MPS Multiprocessor System

This paper presents the mechanism of the bus arbitration in PI-MPS multiprocessor sys-tem,describes encode approach,arbiter timing states and uniqueness of master modular ininterconnection bus,and measures and analyses latency of bus arbitration as well.     

Analysis of Control Characteristic for the Drive System of Electric Transit Bus

The drive control system of the permanent magnetic direct current motor with the enhanced mag-netism windings used in the electric transit bus is developed. The mathematics model of the drive control sys-tem for this motor is established. The new mode that the added-exiting magnetism field could be weakened and the speed of the motor could be controlled automatically is proposed and realized. The method of root locus design is applied to analyze the acceleration control characteristic. The results of simulation show that the new drive motor control system has extraordinary response characteristic and adjustable performance. Experiments of vehicle running show that the drive control system‘s antijamming ability is strong and the adjustable perfor-mance is fast and smooth, it can meet the demand of power characteristic very well.     

Application of CAN Bus in Hotel Guest Room Service and Management System

Technical features about CAN bus are described. One kind of scheme in Hotel Guest RoomService and Management System based on CAN bus is presented. The system's structure and mainfunction are expounded. The work principle and design of the system's hardware and software areexplained. The realization of the system's hardware and software is detailed from aspects of     

Statistical Analysis for the Driving Cycle of Beijing''''s Bus

According to the test data of the driving model for Beijing's bus routes, 9 parameters and the actual values of Beijing bus are confirmed to evaluate the driving cycle, 2 ways of establishing driving cycle model are analyzed, the formula of calculating driving cycle is acquired, and the calculating driving cycle model and the statistical driving cycle model for the buses in Beijing urban areas are set up. This study provides scientific basis for selecting the bus type and confirming the design parameters and the running method in Beijing.     

Utility and Weight of Factors of Bus Transit’s Service Quality Analysis in Nanjing

Service quality is a major factor that affects how public transport users evaluate bus service. In order to evaluate how bus users make trade?offs across travel cost, time, reliability, etc., and to in...     

Logical Design and Control of Network in Local Mine Air-Reversing System

:This paper sets up a mathematical model of switching network and switching function by utilizing graph theory to describe the logical function of different paths. The function varies with open and closed states of air doors in a complex mine air sub-network, and the computer program for solving the switching function of complex networks are offered. It gives the method for discriminating a reversible branch in a complex network by means of the switching function, and the method of counter-inverted logical control of airflow inversion by means of open and short circuit conversion of key branches. The research has solved the problem of the stablization of air flow for normal ventination and reversing ventination in a diagonal network.     

Study on Ultracapacitors Parameter Design and Control Strategy of Electric Bus

Based on the analysis of ultracapacitors efficiency and vehicle driving character, three conditions restricting the ultracapacitors charge/discharge time are derived. The study focuses on ultracapacitors specific design rules decided by charge/discharge time and how to integrate with battery packs and converter through ultracapacitors＇voltage and current double regulators. Through BFC6100-EV electric bus test, it is shown that the proposed method and control strategy are feasible and the system can effectively improve the bus dynamic performance and ability to receive braking energy effectively.     

Design and Realization of Mineral Feeding SCADA System

1 Introduction In the grinding process of the metallurgical industry, the mineral feeding quantity is required to be regulated in time according to the disposal capacity of the grinding machine, the granularity and concentration of the product. At present, manual min- eral feeding is widely used in concentration plants [1] where workers observe the granularity, concentra- tion of the product and the current of the grinding machines, then regulate the mineral feeding on the basis of the observe…     

The Analysis of the Dynamic Equilibrium State in Linear Control System

This paper discusses not a point of equilibrium to free system,but a certain family of equilibrium state of dynami- cal system with inputs.This equilibrium state depends on the input,so it is called the dynamic equilibrium state.The expression of the dynamic equilibrium state can be given under some certain condition.With deductions and proofs in linear control system,es- tablish the expression of the dynamic equilibrium state in two cases,where the linear systems are nonsingular or singular.Also pre- sent the concept and the condition of the controllability of the dynamic equilibrium state.The controllability of the dynamic equilib- rium state is different from the controllability of the state to system,but these two are closely related.     

Statistical Analysis for the Driving Cycle of Beijing＇s Bus

According to the test data of the driving model for Beijing‘s bus routes, 9 parameters and the actual values of Beijing bus are confirmed to evaluate the driving cycle, 2 ways of establishing driving cycle model are analyzed, the formula of calculating driving cycle is acquired, and the calculating driving cycle model and the statistical driving cycle model for the buses in Beijing urban areas are set up. This study provides scientific basis for selecting the bus type and confirming the design parameters and the running method in Beijing.     

Research on Integration of Coal Mine Monitoring and Control System with Field Bus Control System

1 Coal Mine Monitoring and Control Sys- tem and Field Bus Technology As one of the most important methods to im- prove modern management and production efficiency in coal mines, monitoring and control technology have been widely adopted to maintain safety in coal production. Taking advantage of foreign technologies from the 1980’s, coal mine monitoring and control systems have expanded rapidly in China. At present, automatic control has come into use in most large- scale coal mines, which …     

Optimization Design and Finite Element Analysis of Core Cutter

The hydro-hammer sampler is a new type of sampler compared with traditional ones. An important part of this new offshore sampler is that the structure of the core cutter has a significant effect on penetration and core recovery. In our experiments, a commercial finite element code with a capability of simulating large-strain frictional contact between two or more solid bodies is used to simulate the core cutter-soil interaction. The effects of the cutting edge shape, the diameter and the edge angle on penetration are analyzed by non-liner transient dynamic analysis using a finite element method （FEM）. Simulation results show that the cutter shape clearly has an effect on the penetration and core recovery. In addition, the penetration of the sampler increases with an increase in the inside diameter of the cutter, but decreases with an increase in the cutting angle. Based on these analyses, an optimum structure of the core cutter is designed and tested in the north margin of the Dalian gulf. Experiment results show that the penetration rate is about 16.5 m/h in silty clay and 15.4 m/h in cohesive clay, while the recovery is 68% and 83.3% resoectively.     

The Microstructure and Gelling Mechanism of Thermo-responsive Chitosan Hydrogel System

Thermo-respansive chitosan hydrogel system （TRCHS） was prepared and its mierostructure was investigated by scaning electron microscope （SEM） and mercury intrusion poremaster （MIP）. Based on analyzing the data, a special porosity property was reported at the first time. Its gelling mechanism was studied by a group of contrast experiments. Results may provide experimental and theoretical supports for how to apply it on tissue engineering scaffold and how to influeuee or control its essential properties.     

Design and Develop Online Monitoring and Early-warning System of Crane Structural Stress

This paper proposed an online monitoring and early-warning system of dynamic stress of crane metal structure, and designed this system's hardware, including sensor unit, data gathering unit, and controlling & processing unit of this system, and discussed the waterproof protection for resistance strain wafer and scheme of data gathering and transmission of dynamic strain gauge, moreover developed system software of real-time and online monitoring dynamic stress, including data gathering by DLL and data display & processing based on Visual C++. The system applies the dynamic strain gauge to gather the data of the stress, and communicates between PLC control system of crane and upper industrial computer, so that realize the real-time online monitoring and early-warning for crane's metal structure stress. The test results show this system carry on real time and online monitoring to dynamic stress of load-bearing metal structure longly and stability, and can give an alarm and overload protection on time. So the system has good practice value.     

Research and Development of Growth Design System for Mechanical Products

1 Introduction Product designis aniterative ,complex,decision-making engineering process .In Refs .[1], Gu P.indicatethat as much as 75 %of the cost of a product is being committed duringthe design process . Now,with develop-ment and wide application of computer technology, more and more researchers have focused their attention andeffort in developingtools andtechniques that are able to support various phases of design. Naturally,design au-tomation tools that can support the whole design pha…     

The Mechanism of the Formation and Transformation of Ettringite

The formation and transformation of ettringite were studied by measuring the ion concentration in liquid phase and analyzing the composition in solid phase. The effects of C3A, gypsum lime and C-S-H gel on ettringite formation and transformation were also investigated. The experimental results shuw, that, when gypsum was presented in solid phase, the composition of liquid phase was in favor of ettringite formation. Ettringite formation consisted of three reactions including the formation of [ Al （OH）6 ]^3- octahedral, formation of Ca-Al polyhedra prism in which Ca and Al polyhedra arranged alternately, as well as entrance of SO4^2- into the channel of polyhedra. [ Al （OH）6 ]^3- formation, which was the slowest reaction, controlled ettringite formation. The concentration of AlO2^- was a main factor that influenced ettringite formation. After gypsum in solid phase was consumed, [ SO4^2- ] decreased quickly and [ AlO2^- ] increased, and it was possible that ettringite transformed into hydrated monsulfate calcium aluminate （ be called M in short） in thermodymanics. The rate of transformation was controlled by diffusion of AlO2^- .     

Design and Implimentation of the Object-Oriented User Interface Supervisory System for Garment CAD/C

ＤｅｓｉｇｎａｎｄＩｍｐｌｉｍｅｎｔａｔｉｏｎｏｆｔｈｅＯｂｊｅｃｔ－ＯｒｉｅｎｔｅｄＵｓｅｒＩｎｔｅｒｆａｃｅＳｕｐｅｒｖｉｓｏｒｙＳｙｓｔｅｍｆｏｒＧａｒｍｅｎｔＣＡＤ／ＣＡＭＢＡＯＱｉｎｇｓｈａｎＺＨＡｏＣｈｕｎｘｉａＷＡＮＧＳｈｕｇｕｏＣＡＩ...     

The Technology of Individual and Digital Pattern-making in the MTM System

The Garment MTM enables to realize the individual and quick manufacture to meet the development of the per- fectly popular and various garment industry,whose core technology is to produce the individual and digital pattern,that is,get- ting the individual pattern-making according to the body information.It is relatively correct and wise to get the individual pattern by modifying the basic pattern and the experts in this field do their researches on this way.One vital and unsolved problem is that how to find the very pattern which is the closest to the customers in the pattern-database which determines the validity of the final pattern.We conclude a technology methods from body information to digital pattern,design the rule of seeking yards and pattern- modification,build the B-P system (the system of the quick manufacture technology of body information-digital pattern),set up the style database,yarn database,pattern database,the rule databases of seeking yards and pattern-modification.It is confirmed that the B-P system is available,the setting-up of all the databases in the system is reasonable and the final pattern is correct.     

Web-Based Synthetic Optimization Design System of Micro-Components

In order to meet the requirement of network synthesis optimization design for a micro component, a three-level information frame and functional module based on web was proposed. Firstly, the finite element method （FEM） was used to analyze the dynamic property of coupled-energy-domain of virtual prototype instances and to obtain some optimal information data. Secondly, the rough set theory （RST） and the genetic algorithm （GA） were used to work out the reduction of attributes and the acquisition of principle of optimality and to confirm key variable and restriction condition in the synthesis optimization design. Finally, the regression analysis （RA） and GA were used to establish the synthesis optimization design model and carry on the optimization design. A corresponding prototype system was also developed and the synthesis optimization design of a thermal actuated micro-pump was carded out as a demonstration in this paper.     

Ecolifter Conceptual Configuration Design and Parameter Analysis

In the phase of conceptually designing, the Ecolifter with three-lift-surface configuration, the influ-ences of aircraft geometric parameters and configuration such as wing geometric parameters, canard parameters,aircraft center of gravity and engine positions and so on, on flight dynamic stability are discussed with the inte-grated analysis method. On the basis of the analysis of flight dynamic stability, the suitable wing geometric pa-rameters are given and the improved aircraft configuration is proposed.