Advanced Materials Research Vols. 503-504

Abstract: A new type optic fiber pressure sensor is designed by using the mechanism of optical fiber macro-bend loss, which is used in the airplane fuel measurement system to obtain fuel level and density. The ratio method of pressure is adopted in the airplane fuel measurement system to reduce the influence factors, which include the vertical acceleration of a plane, fuel density, the pressure in the tank, etc. A pressure demodulation circuit of high precision and a data processing algorithm of high reliability are designed for measurement system. The experiment shows that the fuel measurement system has the characters of stability, reliability and high accuracy.

Abstract: The paper discusses the problem of quantifying the contribution of systematic errors on the overall measurement uncertainty. We promote the experimental evaluation of uncertainty due to systematic errors. The method is alternative to non-experimental approaches, including the GUM one. The uncertainty due to systematic errors in ADC-based instruments is addressed.We present a general scheme, and use it for the uncertainty due to ADC gain error. The GUM type B uncertainty seems quite poor, compared to the experimental uncertainty.

Abstract: Arterial stiffness is a very important physical parameter and the measurement to it is very important in clinic. This paper describes the principle and arithmetic of arterial stiffness index. The measuring algorithm based on oscillometric method is also discussed. The algorithm proves effective and reliable through the analysis of many cases and doing lots of clinical tests, it has been developed software under LabVIEW7.0 and applied in the hospital. Furthermore, it can give the information of the measurer’s arterial stiffness and provide reference to doctor to determine the measurer’s cirrhosis level.

Abstract: The vibration of completion tubing strings and mechanical analysis were not accurately verified by field experiment because of the limited downhole space and the difficulty of downhole measurement. So vibration measurement device for completion tubing strings was designed and fabricated. The device was fixed in thousands of meters downhole with tubing strings. The vibration data of the tubing strings was recorded in the well testing process and compared with the theoretical calculation result to perfect the theory research and analysis results. The device design referred to downhole electronic pressure gauge and other downhole tools and was proved to meet design requirements by laboratory experiments and field. Through the device of the built-in accelerometer measuring string vibration acceleration, the vibration state of completion tubing strings were known and vibration frequency of tubing strings were estimated. Vibration state was proved to exist in completion tubing string of high pressure gas well by field testing

Abstract: Aimed at the problems of that present fault detection system for Auto-Loader can’t adapt the need of maintenance and support under field conditions, a set of portable intelligent fault detection was developed. On the basis of deeply analyzing Auto-Loader’s sequence control circuit and operating principle, the system overall design plan was built up; circuit of the power, data acquisition circuit, mutual interface circuit and other hardware were designed, anti-interference technology was studied; Data analysis software of upper computer system was developed by Visual Basic, the interface was used and studied briefly, suitable for every level’s technical staff. The example of fault detection of Auto-Loader’s program control box has indicated that detecting instrument was practical.

Abstract: With an example of simply supported beam, it is presented a new volume displacement sensor and uniform force actuator design method to active control of structure-borne sound. An array of rectangular segments of PVDF film and PZT attached on the front and back surface of the beam are taken as sensor and actuator respectively. The output signals of the PVDF films are multiplied by appropriate weights so that the weighted combinations of the outputs directly lead to the volume displacement of the beam. The input control of each PZT actuator is driven by the same control input voltage but with different appropriate weights so that PZT array generates a uniform force over the beam. Finally, optimal control simulations are performed to validate this sensor/actuator strategy

Abstract: The mine safety monitoring system is a set of sensor technology, electronics technology, power electronics technology, computer technology, wireless communication and network technology in one of China's leading multi-functional computer network systems, including underground, Inoue environment and equipment the detection of network systems and the Inoue monitoring data processing system. Environment and equipment for testing network system to achieve underground, of Inoue environment physical monitoring and control; monitoring data processing system is a comprehensive treatment of the collected data in order to achieve the sub-station set up and control equipment or detection sensors, through LAN detection information sharing, may constitute the enterprise information system.

Abstract: We designed a subway intelligent environment monitoring system based on ZigBee. The system makes use of the wireless sensor networks to achieve real-time monitoring to the subway environment.

Abstract: In this paper the SOPC technology is applied to the power parameter measurement in a FPGA chip. The Fast Fourier Transform (FFT) algorithm implemented in the FPGA is the theory basis of the system, and the 32 bit NiosⅡ soft CPU nuclear is embedded in the FPGA, which can realize the functions of power signals samping, data processing, storage, display and so on. The experimental result shows that processing precision meets expectations, and achieving requirements of the real-time system, with advantages of high integration and flexible reconstruction.

Abstract: A digital control system of high-precision carving machine is presented in this paper. According to the requirements of high-precision caving machine, a servo motor controller based on the field orientated control (FOC) strategy is applied. Thus the high-precision control system base on DSP of electronic carving machine is realized. The results of system operation are shown that the control system and the servo motor controllers can run steadily and precisely. The system also represent that inter - connected controls parameters of this system were correct and valid, the control method was proper and effective