Advanced Materials Research Vols. 139-141

Abstract: In order to meet the needs of the wide range of frequency and changeable voltage, and the combination of multi-frequency and multi-power in water process, a new frequency converting electromagnetic water treatment control system is developed. The frequency ranged from 1Hz to 1MHz is produced with the DDS pulse chip controlled by MCU, which guarantees that the range of frequency converting is wider. By using the switch circuit and MOSFET, the amplifier circuit is designed. The circuit and CNC power enlarge the output electromagnetic pulse power adjustable range. The software developed with LabVIEW makes frequency work under three kinds of frequency converting modes. And it also can make voltage run under the mode of voltage selecting and user-defined voltage converting. The designs improve the applicability of frequency converting electromagnetic water treatment (FCEWT) system.

Abstract: As most controllers of the carton samplemaker using Industrial Personal Computer (IPC) architecture, its price is relatively expensive. Aiming at the actual situation of the high cost, low openness and big demand of the carton samplemaker, through the analysis of the control characteristics of it, the embedded Numerical Control (NC) platform based on the Advanced RISC Machines (ARM) and Digital Signal Processor (DSP) hardware architecture for carton samplemaker is designed. The overall framework of the platform and steps of the design are given in this paper. Windows CE embedded real-time operating system is adopted in the software design, and on this basis, the carton samplemaker applications is developed, which is mainly in charge of the motion control of the equipment and tasks management. The platform not only achieves the goals on real-time control, good speed and accuracy, but also has friendly operability. Finally, the introduction of the new dual-core chips gives a revelation on the future development in carton samplemaker.

Abstract: In order to meet the fast on-site calibration of temperature sensor and temperature measuring instruments, A kind of intellectualized high-precision temperature calibration device based on Embedding System is developed. This device based on ARM and a proportional-fuzzy self-tuning PID optimal control algorithm is characterized by high accuracy and fast response. Its performance parameter is given as following: measuring range, 35oC-600 oC, accuracy, ± 0.50 oC (at 600 oC), resolution ,0.01 oC, stability time 40 minutes(at 600 oC). To ensure the portability of μC/OS-II, a set of data types is defined by authors. As same as all the real time cores, it is necessary for μC/OS-II to reject the interrupt before accessing the critical section of codes, and the interrupt is to be allowed again after the access. In this paper, the design of system , especially the porting of μC/OS-II operating system, is introduced.

Abstract: To meet the industry demands of the drive motor controller of the pure electric vehicles, this paper introduces a design of the high-power brushless DC motor controller at the core of dsPIC30F6010A. Through the establishment of permanent magnet brushless DC motor (PMBLDC) mathematical model and the analysis of the running principle of it, the control scheme of pure electric vehicles was presented and the drive circuits, protection circuits and software programming of PMBLDC controller were designed in this paper. The paralled IGBT module is adopted as the drive circuits to solve the heat dissipation issues under the high current, PID is chosen as the control algorithm and cascade control is designed as the speed regulation.The simulation by MATLAB/simulink shows that the control scheme is reasonable, the system has fast response and smooth running.

Abstract: Focused on the complexity and Time-consuming of judging the error wiring of the energy measurement device, It extracts a series of electric parameter tables including phase angle table, such as the voltage sequence table, the line voltage location table, phase angle transform table, and phase angle table. And proposes a simple method of judging the error wiring of Three-phase three-wire error wiring of two components energy measurement device. The method based only on the four tables, inspectors only need to look-up the tables in accordance with the measured dates and get the error wiring instead of drawing vector plots. Because these tables root from vector plots. It greatly simplifies inspectors to judge wiring mistake, improves the working efficiency and makes the test results more accurate.

Abstract: In order to monitor residential quarter security intelligently this paper designed a remote control system based on ZigBee wireless sensor network and Ethernet. According to monitor requirements about environment parameters and low energy consumption the system used 16 unit SPCE061A and 32 unit SPCE3200 separately as a key controller in sensor node and coordinator node. With the help of UZ2400 and Ethernet controller ENC28J60, it established a star network conforming to ZigBee standard and realized the functions of real-time acquisition collection, wireless remote transmission and communication on microcomputer. By collecting the information of temperature, water level, gas concentration and infrared warning the remote monitor center can know well the whole quarter safety conditions. It introduced the system structure and the designs of hardware and software. The experimental result shows that the system has high reliability, excellent real-time characteristic, extensibility and favorable apply foreground.

Abstract: This paper presents about the optimization design of Silicon resonant pressure sensor. The new idea is the Silicon circular resonator was used as the sensing resonator. This sensor is Lead-Zinconate-Titanate (PZT) driven and the resonant frequency shift also detected by PZT. This micro resonant pressure sensor works on the principle of resonant shift caused by the change of internal stress due to applied of the external pressure. First, we analyze the numerical relation of circular resonator. Then, Finite element analysis (FEA) has been examined for optimization for the size of Si circular diaphragm, size of the PZT patches and placement of the PZT was analyzed. And the fabrication process also presented in this paper. The pressure range is 0~0.1Mpa. The resonant frequency is about 102.29 kHz and the linearity of the output frequencies shift is so good under Silicon diaphragm small deflection limited.

Abstract: Coating with a calixarene derivative on gold surface of AT-cut quartz crystal, a piezoelectric quartz crystal (PQC) sensing device was successfully fabricated in this paper. Among four calixarene materials, the compound of MRCT was the most efficient actively coating material for recognizing ethanol molecule based on a host-guest recognition mechanism with C—H•••π interaction. In comparison with gas-chromatography (GC) method, the calixarene based PQC device can be well used for on-line detection of the ethanol vapor in the range of 0 ~ 3000 ppm around our environment with a recovery of 92.33~105.76 %. The detection limit can be evaluated to be 3.53 ppm. Furthermore, the proposed TSM sensor possessed good selectivity, reproducibility, reversibility and high stability for practical purpose.

Abstract: A fuzzy weighted attitude estimation algorithm is proposed to settle the problem of attitude determination for Optronics Mast Systems (OMS) by combining gyros and inclinometers. Firstly, Euler representation is employed to descript attitude kinematics, and then nonlinear continuum state space model is derived, based on analysis of mathematic model of gyros and inclinometer. Secondly, EKF is used to linear and discrete the models, and a weighted measurement update equation of attitude and gyro drifts is developed under kalman Filter framework. Lastly, according to the relations between the weighted value and body motion, a weighted value determination method is proposed based on fuzzy reasoning system. The experience results show that the accuracy of attitude estimation algorithm is 0.0380. The algorithm also solves the problem of vibration disturber of inclinometer and measure error of gyros in long term.

Abstract: To optimize the structure of posed direct-decoupling planar capacitive sensor (PCS), methods for capacitance and sensitivity computation are studied, and the structural optimization is established. Firstly, four methods are compared with to find a suitable analytical method for the calculation of posed PCS capacitance and sensitivity. Then, electrostatic field equation method are applied and under the condition of given sensitivity, PCS structural parameters, i.e. the length of side and the number of plates is optimized. Computation results indicate that electrostatic field equation method is available for the calculation of capacitance and sensitivity on one hand, and on the other hand, when the length of side of PCS plate is twice the gap of two parallel part (l≈2d )and the number of plates is seven (N=7), PCS can meet sensitivity requirement and take up the smallest dimension.