Advanced Materials Research Vols. 756-759

Abstract: Electromagnetic flow meters are widely used in two-phase or multi-phase flow measurements in recent years. In this paper, simulation model is established to study the flow meter response characteristics which exist a non-conductive body (oil bubble) in the fluid by use finite element software ANSYS. We analyze different electrode size impact on the response characteristics of electromagnetic flow meter in the measurement of two-phase or multi-phase flow which includes non-conductive material in the fluid, which provides reference for design of the sensor electrode sizes, and provides a theoretical basis for error analysis measuring two-phase or multi-phase flow under different electrode sizes of electromagnetic flowmeter.

Abstract: In this design, AT89C51 microcontroller is as the core ; KEIL is as the system development platform; The C51 language is used to design program. Multi-point temperature measurement system is designed with the DS18B20 intelligent temperature sensor. Under the Proteus platform simulation, the data results of the system actual operation is analyzed.This design did not use DS18B20's usual 1-wire bus structure, but use the parallel port of 51 single-chip computer. At the same time the temperature of 4 DS18B20 sensors are fast read. Therefore,it realized rapid accurate recognition and processingin in multi-point temperature measurement system of multiple sensors,and this kind of distributed temperature measurement system interface is simple, high precision, strong anti-jamming ability , stable work etc..

Abstract: Cutting-force error is the main portion of errors in the NC process, and the analysis of the cutting-force error is based on the measurement of cutting force. Introduced the detection method of cutting force, and analyzed the principle of cutting-force detection by detecting the current of servo motor.

Abstract: According to the analysis of control structures of the two typical control modes-pitch control and height control, the simplified control rules for the two special control systems are presented. Under the condition of enduring the real-time property and fidelity, the classical control theory is applied to study the control parameters selecting of the flight control system (FCS) based on PC modeling traits. The selecting process of control parameters of longitudinal control channel is analyzed and the simulation resources are simplified. The simulation model is achieved. The steps are summarized for the simulation modeling of longitudinal control channel of the flight control system, and the corresponding flow chart based on PC is also given.

Abstract: The article, three-phase squirrel cage induction motor as the research object, introduces the design of a new dual-PWM VVVF system based on ARM. The rectifier link design control strategies based on the power of the inner power loop and outer voltage square loop control system. The inverter link design a double infinite loop vector control speed regulation system of torque, flux linkage to the inner ring, rotational speed to the outer ring a double infinite loop vector control . And then, to combine rectifier link and inverter link to build dual-PWM VVVF system. Focuses on realization of the control system software and hardware-based LPC2132 and μ C/OS-II. Gives the hardware design of the overall program, as well as software realization based on the hardware μC/OS-IIoperating system . Introduce some of the specific features of the program as well as hardware and software anti-jamming technology . Conduct simulation verification to the dual-PWM VVVF system. The results show that: The dual-PWM control system can realize better control effect.

Abstract: The gas sealing performance of electronic sphygmomanometer is an important index of its quality control. At present, the gas leak detection of sphygmomanometer is mainly by manual, which has disadvantages of low efficiency and precision, huge impact of human factors and so on. An automatic and high precision gas sealing performance inspection module is proposed in the paper, which solves the problems of pressure calibration and gas leak detection of sphygmomanometer products. The paper also introduces the principle and implementation of system project. The module is designed by STC12C5A single-chip, KPM DC air pump and the pressure sensor of E8CC, which has advantages of high precision, high efficiency, low cost, and flexible operation etc.

Abstract: In the light of the shortcomings of traditional wireless data acquisition structure, the thesis analyzes the advantages of data transmission by GPRS, and then a remote monitoring system based on GPRS technology is proposed. The thesis focuses on overall structure of the system, the circuit design and work process of the remote terminal. It describes the realization method of using Socket multithreading technology to achieve network communication in data center.

Abstract: At present, there are some problems in teaching building monitoring, such as the hidden danger and waste of electricity. In view of these problems, I design an intelligent lighting and monitoring system based on virtual instrument technology. This system consists of light intensity, human body, infrared and mobile sensors. They compose the the Internet of things in this system. By using these sensors and the fuzzy intelligent dimming, the system has a very intelligent and clever lighting. Human body sensors and infrared sensors can help the system monitor the important classrooms and computer rooms. Based on LabVIEW, the system has a excellent interactive operation interface and powerful data acquisition and network functions. With the functions and communication medium such as the Internet and ZigBee, the system can achieve monitoring the real-time illumination and the number of people in monitoring area. This system can also be operated by the remote client computers which equip LabVIEW. It is convenient to extend this system to the remote monitoring system.

Abstract: Based on the new time series analysis and the theory of dam safety, this paper proposed a new forecasting model in dam safety monitoring. First the paper introduced basic method of flat forecast and described its algorithm routine, and explained what is time series. Second the model structure of monitoring system based on time series analysis was given through the analysis of the method. The system can provide the comparison chart of the measured data, forecast data and trends. At last the model was realized based on VB and tested by the actual data. Experimental results show that this forecasting model has better prediction results in dam safety monitoring.

Abstract: Vast amounts of data accumulated by the remote monitoring system for new energy vehicles makes data processing necessary. Among all the data processing steps, evaluating the significance of acquisition parameters is an important one. In this paper, some basic concepts in rough set theory are reviewed, and a method of evaluating the significance of parameters based on rough sets is put forward. This method is applied to the analysis of electric vehicle motor parameters, obtaining good results.