Advanced Materials Research Vols. 791-793

Abstract: The change of the reflectivity signal is modeled by taking into account of the spin dependent band filling and band gap renormalization effects with the carriers density from 5×10¹⁶ /cm³ to 2×10¹⁷ /cm³. The calculated results show the reflectivity signal is a very sensitive function of the carrier density. The most interesting feature is that the reflectivity change from photo-bleaching into photo-absorption enhancement is observed with increasing pump photon energy. The theoretical predictions obtained in this work are consistent with the corresponding experiments.

Abstract: Mathematical analysis, computer simulation and test knitting are used to investigate pattern formation of segment color yarn weft knitted fabric. Vertical stripe, regular argyle and disorganization cross striation are separately formed when yarn length of a course and one color segment cycle conform to certain ratio. The width, height and numbers of regular argyle pattern are deeply studied. Results of three methods match well.

Abstract: For tackling job scheduling problems encountered with discrete manufacturing system for 380km/h motor bogie, Object-oriented Petri Net based Job-Shop Cell Controller System (OPNCC) was brought forward identifying categories of all objects within cell control model, describing relationship between categories, analyzing and recognizing cell control logic through the dynamic behavior of physical objects and introducing control decision and strategy into the control logic of as designed OPN model, thereby constituting a complete object-oriented cell control model. With improved genetic algorithm, it can offer dynamic optimization to balanced production of multiple work pieces on several machine tools so that the machine tools can be utilized to a maximum extent.

Abstract: The force of tower crane is extremely complex when climbing, and climbing frame is the key to structure loaded by forces of climbing working condition, which supports all loads of the upper part of the tower crane when climbing. The guide wheels are arranged on climbing frame, and play the guiding role between climbing frame and tower body. The guide wheel pressure can reflect the upper horizontal loads and unbalanced moment, and climbing press reflects the upper vertical loads. This article is based on the climbing press and guide wheel pressure to analyze loads state of the upper part of the tower crane when climbing, ensure the upper load values in a safe range when the tower crane climbing.

Abstract: The strapping machine for Paper Bills typically was designed to reduce labor intensity and enhance production automation level. The machines structure and working principle were described. There are three work posts in this equipment, they work continuously. This approach makes it very easy to split up a complex transformation into a series of simple transformations arranged in a loop line. The machine includes currency count/counterfeit distinguishing system, conveying system and strapping system. In the same time, the machine control system that adopts the PLC programmable controller can simplify the control system, and its reliability strengthens further. Practices show that the strapping machine has the advantages of simple structure, high efficiency, low cost and small vibrating noise.

Abstract: This paper proposes a kind of on-line control system for operation mode in substations, which can read data on-line from EMS, and then calculate total loss of substations in parallel operation, split operation or individual operation mode. According to the result, the system can select the most optimized way and feed the conclusion back to EMS, which can make substations operate in the most optimized way. The system is suitable for optimization of substation in rural power grid.

Abstract: Complexity control theory based on the model depict the complexity of the controlled object more accurately through research model and data-driven control theory of Internet of things is more urgent to be explored through the data to find out the system of internal control mechanism. Look from the appearance, the complexity of data including a lot of sample, high dimension, strong time-varying factors. The representation of implicit information is huge amounts of data redundancy, high-dimensional data clustering features, the time-frequency characteristics of time-varying data, etc. At present, the data-driven control theory research is just beginning [1-3], the scientific problem is the lack of unified definition and theoretical framework. This paper will analyze the sewage treatment system of some sewage treatment plant, making the internal scientific questions are more specifically.

Abstract: Building a dynamic coordinated shifting control model of hybrid electric bus, analyzing of dynamic coordinated shifting process to achieve good perfomance by coordinated control of main motor and engine, clutch control, active synchronous motor, automatic transmission and so on. This article provides motor torque compensation algorithm to achieve no torque interrupted and motor active synchronization algorithm to reduce the shift time. From the results show that the control strategy realizes no torque interrupted and greatly reduces the jerking to achieve the smooth operation in the shifting process.

Abstract: A new decision algorithm for ACC systems is proposed. Feasible driving set is defined based on state and control constraints, which represent driver behavior features. And based on the analysis of collected driving data, a second-order range policy is selected to approach real driver behavior. Under dynamic output feedback control framework, the decision algorithm has been developed based on quadratic boundedness theory and given in terms of linear matrix inequalities. Performance of the proposed algorithm is verified by Simulink and Carsim co-simulation.

Abstract: Several typical failures of external gear pump are presented. The reasons of the pump failure are analyzed in detail. Solutions of the failure are proposed. In order to improve the efficiency of pumps maintenance and reparation, a new kind of tool is mentioned which could predict the life of gear pump before failure occurred.