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Currently, the wireless sensor networks QoS is confronted with many challenges. Wireless sensor networks has many characteristics, such as basing on the data, and facing application and dynamic characteristics. This paper emphatically analyzes the description of wireless sensor networks QoS and its QoS evaluation method. Then quantize the QoS index and Computes QoS indexes weights. Finally, based...
A compression approach of power quality monitoring data based on two-dimension Discrete Cosine Transform (DCT) is presented to deal with huge data about power quality event detection. The monitoring data was truncated and recomposed in multiple cycles to transform the one-dimension data into the two-dimension data, which was a matrix in essence. The matrix was divided into some sub-blocks all of which...
The flame flicker is an important physical phenomenon associated with the characteristics of a combustion process. The flame flicker frequency is a parameter to evaluate the existence of the flame in the boiler. This paper presents a new method to calculate the flame flicker frequency with the empirical mode decomposition to the time-series of the detected flame signal. A flame monitoring system including...
We introduce a new monitoring system using the time-off flight (TOF) technology. The system employs a quad tree-like structure in data processing and can be applied in rigid object detection and tracking.
The QRS complex detection technique for intelligent ECG monitor was presented. Firstly, the pretreatment of ECG data including the rejection of 50Hz power-line interference and the removal of baseline wander was focused on. Afterwards, the method combining the differential threshold method and the amplitude detection method was introduced for localization of R-waves. The improved Tompkins differential...
This paper presents the design and implementation of an Embedded Laboratory Security Monitoring System (ELSMS). The system includes a web server which acquires video information through camera, and Wireless Sensor Network (WSN) which gets environmental parameters through sensors and sends them to the web server. Users can access the Monitoring Server (MS) through PCs or Wireless Mobile Terminals(WMT)...
With the background of practical automatic control project of stage mechanical equipment in Qujing, Yunnan, P.R.China, high levels configuration software of Schneider Electric named Monitor Pro7 is introduced to accomplish the task of monitoring and controlling on site. Related structure diagram of the control system is shown and the function of Monitor Pro7 is emphasized. The characteristic of the...
In petrochemical process, the kernel task of avoiding abnormal situation is fault diagnosis of the process. As signed directed graph (SDG) can reflect the path of fault propagation clearly, it is a hot spot in fault diagnosis of petrochemical process currently. However, basic SDG is poor in resolution and insensitive to early fault, so it is needed to introduce other algorithms to solve the shortcomings...
Aiming at the hot topic of automatic control of excavator, a hydraulic excavator is retrofitted in this paper. Electro-hydraulic proportional valves are installed. The feedback control and intelligent monitoring system is designed based on CAN bus. The motion control model of excavator's working unit is deduced. According to the characteristics such as nonlinearity, parameter uncertainties and external...
Aiming at the need of detecting the residual current fire monitoring detector, an intelligent test system based on virtual instrument technology was designed. This system was composed of industrial computer, data acquisition card, signal conditioning circuit, three-phase great current generator and pneumatic fixture, etc. Using Lab VIEW virtual instrument technology platform, the related test and...
The pilotless fruit-transportation gyrocar works in the economic forest, avoiding the obstacle on the rail is the prerequisite of its safe working. An ultrasonic obstacle avoidance system of fruit-transportation gyrocar based on ARM embedded system is introduced in this article. The functions of the system are implemented. It could make the gyrocar stop when detect an obstacle and sends the information...
In recent years, the exploration activity of oil and gas industry in ultra deepwater is numerous. The main offshore industries around the world are busy building drilling systems for deeper and deeper water, progressively using all kinds of new technologies. At the same time, the technology of deepwater risers, which are the main tools connecting sea surface and seabed, are more and more important...
Develops a gas leak detection and location system for the production safety in Petrochemical Industry. The system is based on Wireless Sensor Networks (WSN), it can collect the data of monitoring sites wirelessly and sent to the computer to update values in the location software. Consequently, it can give a real-time detective of the potential risk area, collect the data of a leak accident and locate...
A design of smart sensor system based on digital signal processor, acceleration sensor, magnetoelectricity speed sensor, Acoustic press sensor, gripper piezo-electricity sensor, A/D converter and CAN bus was introduced to establish a embeded system which can monitor the vehicle's online working condition. The software and hardware of the system was introduced. The order spectrum of the acoustic signal...
The work environment of control unit is not very well for intelligent circuit breaker, such as electromagnetic interference is one important factor. In this paper, hardware and software were applied as anti-Interference measures to ensure the Electromagnetic Compatibility (EMC), so the reliability of circuit breaker system was advanced. The external and internal interference was defined depressed...
Experimental investigations on cavitation in Kaplan turbines are to achieve: (1) Characteristics of sound waves emitted by cavitation, (2) The laws of cavitation intensity varying with operating states donated by water head and power output, (3) The relationship of cavitation intensity to cavitation erosion level, In this sense, a series of tests have been proposed and carried out in laboratory and...
G-R scaling relations are commonly used on seism prediction. It's mainly used to estimate seism activities for different spaces and time windows and also to predict the probability of seism occurrence. The variance of b-values can reflect the seism active degree of the area. The paper uses this curve to describe the relationships of failure grades and failure rates of CNC lathes which makes an attempt...
Element bearing is one of the widely used universal parts in machine. Its running condition and failure rate influence the performance, service life and efficiency of the equipment directly. So it is significant to research on bearing condition monitoring and fault diagnosis techniques. The paper describes the use of vibration measurements by a periodic monitoring system for monitoring the condition...
Identification of water quality conditions in a river system based on limited observations is an essential task for meeting the goals of environmental management. Various classification methods have been used for water quality estimation. However, a discrepancy frequently arises from the lack of a clear distinction between each water utilization mode, the uncertainty in the quality criteria employed...
In order to solve the problems of hydrographic measurement, a new river flow velocity monitoring system is presented in this paper. The system hardware design is discussed in detail. Data acquisition module based on accelerator MMA7260Q, wireless communication module based on wireless chip and MCU peripheral circuit module are mainly discussed. Communication quality of hardware system is improved...
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