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With the development of the high-speed rotating machine, the rotor is becoming very sensitive for the mass unbalance caused by the asymmetry design, machining error, assembly error and operational fault. In order to actively reduce the rotor unbalance, a new electromagnetic balancing mechanism is proposed. This balancer is driven by the ring coil and keep the balanced condition by the permanent magnet...
The key mechanical components of belt conveyor is lack of effective monitoring at present. The traditional monitoring methods such as visual inspection, temperature measurement have shortcoming, the huge workload, blind spots and other issues are difficult to solve. This paper proposes an inspection robot program with infrared thermometer for belt conveyor. Along the inspection track, the motor drive...
Site and dimension controllable nanocone arrays have been fabricated by a combination of inkjet-printing and nanosphere lithography. Each printed array is of well-formed circular geometry with diameters of about 20 μm. The nanocones with base diameters of 500 nanometers and sharp tips are formed due to etch isotropy. Photoluminescence has been carried out to study the optical properties of the Gallium...
According to the IEC and national standards, the powerful data-processing capability of DSP and the high precision A/D data acquisition chip are used for data synchronous acquisition and analysis, monitoring values are computed in the DSP which communicates with ARM via serial port and FIFO. Making full use of some characteristics of ARM module, such as its high performance and ample periphery interfaces...
In order to improve the accuracy and speed of the system measuring crossing-link polyethylene (XLPE) cable materials contaminants, a method of processing defect information is provided based on Field Programmable Gate Array (FPGA). Firstly, the signals exported by CCD, in which materials information is contained, are converted into digital signals by A/D converter. Then the digital signals are input...
Because of wire rope conveyer belt with high load operating and complex conditions of coal mine, it is prone to cause conveyer belt horizontal rupture. It will bring tremendous hazards for coal mine safe production. Defects of wire rope and joints displacement are monitored by weak magnetic detection system. The algorithm of integration with wavelet transform and improved LMS adaptive filtering algorithm...
Methane detecting and alarm miners lamp has proved very effective on methane monitoring in recent decades. The functions of those lamps are limited for its size, caused high maintenance costs and performance instability. Aimed at computer technology, modern signal analysis and processing technology, a mini intelligent methane detecting and alarm system is developed. Firstly, the status of domestic...
As fuzzy ontologies for fuzzy knowledge representation are increasingly constructed, how to store fuzzy ontologies is becoming a more pertinent issue. In this paper, we make use of the advantage of fuzzy relational database as an efficient solution to store fuzzy ontologies. Considering the characteristics of structure and individuals of fuzzy ontology we propose corresponding storage means, respectively...
Networked CNC (computer numerical control) system is the foundation for realizing automation, intelligent and globalization of manufacturing. The transparent model, real-time and deterministic communication of industrial Ethernet is urgently needed. The communication platform based on Manufacturing Message Specification (MMS), TCP/IP and Ethernet is the trend of the next industrial automation communication...
Area monitoring is a common application of wireless sensor network (WSN). Mining area Monitoring System for Methane is very important because it guarantees the coal mine production safety. Automatic calibration technologies were useful for reduce the impacts of methane sensor's stability that led to shortcomings of traditional gas detector, such as frequent recalibration, high maintenance cost, and...
The conventional CNC lacks of flexibility for network and integration in manufacturing, because of its close architecture and network shortage etc., one of the effective measures to solve the problems is ONC (open numerical control). But the ONC based PC cannot carry out open architecture from core, results in resource wasted seriously and needs to study its reliability further. This paper proposed...
Automatic calibration technologies were useful at reducing the impacts of methane sensorpsilas stability that led to shortcomings of traditional gas detector, such as frequent recalibration, high maintenance cost, and high false alarm rate. This paper described a mini intelligent methane sensor to be used as a sensing node to form a real-time methane monitoring network based on nRF240. Moreover, a...
In electric vehicle (EV) drive voltage source inverter (VSI), DC-link capacitor can be primarily designed on RMS current value and its capacitance can be selected small values cause of bulky equivalent capacitor in battery. An advanced film capacitor is adopted to replace the conventional electrolytic bulk capacitors. This paper describes the PSpice model of VSI with major parasitic parameters and...
Steady follow-up control and high overprint precision, that puzzled designer long ago, are the key technology for RSP (rotary screen printing). This paper puts forward and realizes the high speed follow-up control of RSP based on PMAC. The system makes up of PMAC (programmable multi-axis controller), Panasonic's AC servo motor, a photoelectric encoder and atc. The encoder is mounted on principal axis...
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