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The following topics are dealt with: analog to digital conversion; wireless sensor networks; power system monitoring; control systems; image processing and recognition; sensors and measurement technologies; and mechatronics automation.
This paper introduces the machining principles and characteristics of form grinding cylinder gear as well as the composition of the profile shape of a form disc grinding wheel. By using the non -instantaneous section envelope machining principle, a mathematical model of form grinding the in volute surface of the helical cylinder gear is established. And also a calculating formula used to dress the...
This paper introduces the machining principles and characteristics of form grinding cylinder gear as well as the solution process of circular arc and continuous least squares circular arc. after the profile shape of grinding wheel is dispersed into n discrete points using a mathematical model, discrete points are fitted with continuous arc instead of least square circle arc, which solves the smoothing...
GRBF neural network and frequency spectrum analysis are applied to fault diagnosis for component of power electronic equipment in certain facility. By collecting the voltage signals of key points and proceeding Fourier analysis, the structural parameters of GRBF network are determined. Fault determination mode is established. Both experimental and simulation results show that the proposed method is...
The paper introduced a high speed measurement system called virtual dynamic signal test system for the yarn tension of weaving, winding and warping based on Direct Memory Access (DMA) and which was applied on loom and winding machine to test the performance of the system. The working mode of DMA in the process of signal acquisition was analyzed. Moreover, according to the measurement of the yarn tension,...
A new hybrid active power filter, composed of passive power filters and active power filter, is proposed for harmonic suppression and high capacity reactive power compensation. A kind of configuration of the hybrid power filter has been presented and its basic principle is addressed, furthermore, the design of passive power filters and the analysis of harmonic current injected by active power filter...
For the poor thermal-wet comfort property of present cotton/lycra elastic knitted fabrics, a kind of three-layer elastic knitted fabric with cotton yarn outside, superfine or special-shaped section filament inside and lycra in the middle was developed. This special structure made the fabric with good thermal-wet comfort property. The cotton yarn outside could absorb the sweat transmitted by the filament...
The pyrolysis characteristics of low quality mixing coal are investigated by thermal analyses, in which the coal is mixed by coal gangue and washed middling coal. The sample is five kinds of mixing materials which their proportion is 1:4, 2:3, 1:1, 3:2, 4:1. The experiment showed that 2:3 coal sample is to achieve best result to the pyrolysis: The pyrolytic characteristic temperatures and the best...
With the changing acoustic sensitivity and requirements for thermal comfort in developing China, the acoustic evaluation of external windows becomes more important. This is particularly interesting in severe cold areas in China since there is a wide range of window types to keep warm. In this research, a series of field studies have been carried out, measuring the sound insulation and thermal insulation...
This article gives the general flow of a simple description on rough set theory and computer aided concurrent tolerance design, through the application of rough set theory to expert system database got reduction for computer assisted, the tolerance design provides valuable to further perfect the basic design theory.
The wall sequence images acquired by lateral multi-lens video logging method had some peculiarities that the overlap region of adjacent images can be estimated. This paper proposed an image mosaic algorithm which first estimated the overlap areas of adjacent images, and then matched for the areas with SIFT feature matching algorithm. To achieve seamless image stitching, the gradated in-and-out linear...
Fountain codes are erasure channels in superior performance of sparse matrix code. Files are transmitted into multiple small packets, each of which is either received without error or not received. Fountain codes are based on the packets communication. The decoder can start to transmit packets without any knowledge of which packets are received. In the paper, introduce the fountain code, LT code,...
The anti-backlash double-roller-enveloping hourglass worm gearing is multi-tooth meshing transmission and it has complex tooth profile. It is difficult to obtain the load distribution among the meshing tooth pairs and the stress distribution along contact line with analytical model. So, based on the geometrical model of the anti-backlash double-roller-enveloping hourglass worm gearing, the Finite...
The establishment of driving system used the centrodes equation of eccentric gear is proposed based on the operational principle of differential velocity vane pump driving systems. The effective laws of the curvature of eccentric gear with meshing driven gear is studied, the centrodes Design method of driving systems used transmission of the eccentric gear is carried out, so that to lay the basis...
Auxiliary swing test-bed is a test device which can complete performance tests of the ship auxiliary equipment by simulating the motion of ships in the water in the laboratory environment. This paper presented a swing test-bed with high torque and dynamic load of three-degree of freedom (3-DOF) in the use of performance tests of the ship auxiliary equipment. It mainly simulated the motion of rolling,...
Aiming at the high-frequency tuned amplifier circuit difficultly designed by traditional methods, Multisim 10 easily compared the simulation data and real data. The suitable components of the amplification were selected by parametric scanning analysis. Measuring the max output voltage got tuning capacitor of the frequency-selection. Emulation analysis was conducted for frequency, voltage gain and...
An orbit-holding traveling mechanism which is used in Automatic Ultrasonic Testing (AUT) equipment is designed in this paper. It is composed of an elastic orbit and an orbit traveler. The AUT equipment is used to inspect the defects of girth weld. The orbit is attached to a pipe near the girth weld. The traveler travels along the orbit with an angle adjusting mechanism used to make the scanner adapt...
As we all know, brush less DC motor, which has been widely used in industrial control fields, has the characteristic of simple, reliable and easy to maintain, as well as high efficiency without mechanical change, and easy-to-be high-capacity, high speed, etc. TMS320F28335, which is the newest 32-bit float point DSP produced by TI company, is the best DSP chip in the domain of motion control. On the...
In recent years, the frequent occurrence of landslide disasters, caused great harm to people's lives and properties. This paper designs some wireless sensor monitoring nodes distributed on the hillside, they construct a wireless data collection network based on the ZigBee protocol. This design combines GSM wireless communication technology and wireless sensor network, it have completed the work from...
The main function of STATCOM is to compensate reactive power on-line, making the power system have ideal power factor. According to the instantaneous power theory, a novel control method is proposed in this paper that power is detected to be the reference compensation power direct. Basing on the relationship between power and switching of IGBTs, the method of double switch tables is used to control...
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