Advanced Materials Research Vols. 383-390

Abstract: Based on virtual instrument technology the detection device of solar photovoltaic lighting system charge-discharge performance is designed, which can test eight parameters of solar cells power amp hours, battery charging amp hours, battery discharge amp hours, instantaneous power of solar cells power generation, instantaneous power of battery charge and discharge etc. The LabVIEW program controls data acquisition card, which realizes real-time data acquisition, display and storage etc. The parameters of the solar cells terminal voltage, the solar cells output current, the battery terminal voltage, the battery charge current and battery discharge current are tested. It contributes to the research of best match for solar cells and LED electrical properties, and provides technical parameters for battery reasonable using and battery life extended, and maximizes the performance of solar photovoltaic lighting system.

Abstract: With the development of computer technology, the importance attached to the security of computer application systems is increasing day by day. Access control, as an important security technology, has been applied in the operating system, the database management system, security management and network operating system etc. This paper adopt the system ideology of high cohesion and low coupling in software engineering, achieve the design of login component by improving RBAC model under .NET platform, the model increases mechanism of direct authorize the users and shield part of users’ authority based on authorize main role, enriches the old RBAC mode of controlling authority, avoids the illegal operation of users, make sure the security of the system. Meanwhile, the component is well designed, and can be easily used as login component in large systems.

Abstract: A method for generating fabricating information of micro device from a feature-based design model is presented. With cooperative design mode, the process model derivation and optimization are accomplished simultaneously. This work provides designer a more intuitive way to design product by means of process verification to improve manufacturability. The key enabling technologies are introduced briefly.

Abstract: This paper presents a kind of single-wheeled robot (SWR, unicycle robot). Lagrange approach is used to formulate the dynamic model of the robot moving in 3 dimensions. The result of model simulation is consistent with the physical. The proposed dynamic model provides some theoretical basis for designing and controlling SWR.

Abstract: In order to get the YKK series motors to the ultimate purpose of achieving energy-efficient, and to meet the various request constraints set forth in the in the actual production, the paper introduces the niche genetic algorithm to the optimization of the motor design. For the forming structure of medium-sized high-voltage stator coils and the actual situation of three round relative fixed size, this article makes a corresponding improvements to the niche genetic algorithm, the proposed approach surmounts effectively the local convergence problem of standard genetic algorithm. The experimental results demonstrate that: compared with the initial program, the ultimate design results of the electrical motors meet the technical specifications of the proposed efficiency motor. Furthermore, the size of motor has been reduced, which saves the effective materials of the motor. It prove the feasibility and advantages of niche genetic algorithm’ improvement, and more important is, it verify the practical engineering value.

Abstract: Use of µc/os-II based real-time, multi-task operating system accomplished synchronized task management and communication. An operational simulation interface for real-time monitoring of elevator was designed by hybrid programming using C and assembly languages based on data collected real time in the shared resource taken by visiting of semaphores and message boxes with shared resource in the buffer zone. In the control room, PC monitor displays elevator’s moving direction, position, condition, and any malfunction situations. It was demonstrated that the µc/os-II real-time operating system-based elevator monitoring system could not only be used under DOS window for Windows but can also be easily transferred to micro processor modules with different structures.

Abstract: X-ray Pipe Crawler is the welding seam detection device that widely used in Oil pipeline construction of middle and far distance transmission. In this paper, a method of automatic positioning system used in pipe crawler weld by using DSP is introduced. And investigate the base method of seam image process. The design of an automatic positioning system used in pipe crawler weld based on TMS320DM642 is given. The image edge detection simulation system experiments are based on MATLAB.

Abstract: A radar signal processing system characterizing high instantaneous dynamic range and low system latency is designed based on a specifically developed signal processing platform. Instantaneous dynamic range loss is a critical problem when digital signal processing is performed on fixed-point FPGAs. In this paper, the problem is well resolved by increasing the wordlength according to signal-to-noise ratio (SNR) gain of the algorithms through the data path. The distinctive software structure featuring parallel pipelined processing and “data flow drive” reduces the system latency to one coherent processing interval (CPI), which significantly improves the maximum tracking angular velocity of the monopulse tracking radar. Additionally, some important electronic counter-countermeasures (ECCM) are incorporated into this signal processing system.

Abstract: According to the reduction for efficiency of high-speed permanent magnet brushless DC motor (High-speed PM BLDC motor) by core loss of stator in the design process, the accurate calculation for stator core loss is very important.2-D finite element method is used to analyze the alternating magnetic field and magnetic field of the stator core of which a rotational speed of 27000rpm high-speed BLDC motor. Harmonic analysis is used for the step magnetic field of high-speed BLDC motor, Based on the model of Bertotti iron loss calculation, superposition of various frequency loss will be calculated, the calculation accuracy was validate to increase.

Abstract: According to the current requirements of bending fatigue test for flexible electronics, a bending fatigue machine based on SCM (single chip Microcomputer) has been designed. using stepper motor driving screw nut body as loading mechanism, improve the accuracy of the structure effectively by gaps eliminator, and achieve the requirement of precision control by using fraction driving technology in the motor control. Photoelectric counter and electrical signals detection circuit have also been designed to achieve unattended function. This design plays an important role in the following testing process.