A General Monitoring Method for the State of Spandex Based on Fuzzy Evaluation and Its Application

2020 ◽  
pp. 271-282
Author(s):  
Limiao Gu ◽  
Yan Wen ◽  
Yu Zhang ◽  
Weijie Chu ◽  
Yunde Shi ◽  
...  
Keyword(s):  
The State ◽  
Fuzzy Evaluation ◽  
Monitoring Method

scholarly journals Research on monitoring method for thinning spinning process of the ultra-thin-walled cylinder based on the drum shape

2019 ◽  
Vol 103 (1) ◽  
pp. 003685041987772
Author(s):  
Xue Wen ◽  
Jian-ping Tan ◽  
Su-qi Liu ◽  
Xin-he Li
Keyword(s):  
Least Squares Method ◽  
The State ◽  
Experimental Results ◽  
Displacement Sensor ◽  
Thin Wall ◽  
Outer Contour ◽  
Monitoring Method ◽  
Spinning Process ◽  
Thin Walled ◽  
Walled Cylinder

In order to perceive the state of the process of reverse thinning spinning of the ultra-thin wall tube, a monitoring method based on drum shape is proposed. The method uses the non-uniform rational basis spline curve fitting method based on the moving least squares method to reconstruct the outer contour data of the spinning zone collected by the line laser displacement sensor and extracts the outer contour curve of the drum zone according to the spinning characteristics. Then, the dynamic time warping algorithm is used to analyze the similarity between the current and previous drum curves in order to judge whether the current spinning state is abrupt or not. At the same time, the current spinning state is judged by combining the curvature comb of the drum curve, the number of convex areas of the drum curve, the drum ratio, and the drum change trend. Finally, the drum shape detection and the spinning condition monitoring experiments are carried out. The experimental results show that this method can obtain the outer contour shape of the drum section at one time, and the accuracy is 0.05 mm with respect to the measured value of the three coordinates. The method can realize the visual monitoring of the abrupt change of the spinning process by judging the similarity of the drum curve at the adjacent time under different spinning states. In the state of instability, the curvature comb of the drum curve is discontinuous, the curve is G0 continuous, the drum ratio exceeds the critical drum ratio 2.0, and there is more than one convex region, which realizes the monitoring of spinning state more accurately. The experimental results verify the correctness of the proposed method and prove that the method can be used as a new method to judge the stability of the ultra-thin-walled cylinder spinning process.

The State Monitoring Method of Electronic Voltage Transformer Based on L-M Algorithm

2019 ◽  
Vol 23 (3) ◽  
pp. 385-389
Author(s):  
Han Lian ◽  
Keyword(s):  
Transfer Function ◽  
Pressure Ratio ◽  
The State ◽  
Transfer Function Model ◽  
State Monitoring ◽  
Voltage Transformer ◽  
Function Model ◽  
Frequency Condition ◽  
Monitoring Method ◽  
The Relationship

In the traditional method of monitoring the state of electronic voltage transformer, there are problems of large monitoring error and weak robustness. Therefore, a new state monitoring method of electronic voltage transformer based on L-M algorithm is proposed. The relationship between input voltage and output voltage of capacitor voltage divider in electronic voltage transformer is obtained by using Laplasse transform. The transfer function model of electronic voltage transformer is constructed based on the relationship result and L-M algorithm. The transfer function model is used to analyze the frequency characteristics of the electronic voltage transformer and the range of normal measurement frequency, and then the partial pressure ratio of the electronic voltage transformer under the high frequency condition is derived. On this basis, by calculating the over voltage amplitude on the two sides of acquisition card in the electronic voltage transformer, the capacitance value between the two adjacent coaxial cylindrical cylinders of the capacitance divider in the electronic voltage transformer is obtained, thus the monitoring of the state of the electronic voltage transformer is completed. The experimental results show that the proposed method has low detection error and strong robustness, and can effectively improve the reliability of electronic voltage transformer.

scholarly journals Dynamic Monitoring of Low Voltage Distribution Network Leakage Detection Device Based on Internet of Things Technology

2021 ◽  
Vol 252 ◽  
pp. 01006
Author(s):  
Yang Wang ◽  
Shiqing Wang
Keyword(s):  
Internet Of Things ◽  
Low Voltage ◽  
Distribution Network ◽  
The State ◽  
Dynamic Monitoring ◽  
Leakage Detection ◽  
Voltage Distribution ◽  
Monitoring Methods ◽  
Monitoring Method ◽  
Internet Of Things Technology

The existing dynamic monitoring methods of low-voltage distribution network leakage detection device have been unable to meet the needs of the distribution network in China. Therefore, a dynamic monitoring method of low-voltage distribution network leakage detection device based on Internet of Things technology is proposed. Based on the introduction of the Internet of Things technology sensor sensing technology, the sensor is installed on the leakage detection device to obtain the operation data of the leakage detection device and preprocess it with noise reduction and normalization. At the same time, the statistical analysis of partial discharge signal is carried out to extract the characteristics of fast waveform signal (energy parameters, sample entropy and modal components). Based on the operation data features of the leakage detection device extracted above, the state diagnosis framework of the leakage detection device is built to diagnose the state of the leakage detection device, and the dynamic monitoring of the leakage detection device in low-voltage distribution network is realized. The experimental results show that: compared with the existing methods, the proposed method has stronger anti-interference ability and smaller monitoring error, which fully proves that the proposed method has better application effect.

Practical Picture Processing

1974 ◽  
Vol 32 ◽  
pp. 338-339
Author(s):  
T. A. Welton
Keyword(s):  
Radiation Damage ◽  
Coherence Length ◽  
Spatial Information ◽  
State Of The Art ◽  
Coherent Radiation ◽  
The State ◽  
Energy Spread ◽  
Electron Micrograph ◽  
Picture Processing ◽  
Molecular Skeleton

Various authors have emphasized the spatial information resident in an electron micrograph taken with adequately coherent radiation. In view of the completion of at least one such instrument, this opportunity is taken to summarize the state of the art of processing such micrographs. We use the usual symbols for the aberration coefficients, and supplement these with £ and 6 for the transverse coherence length and the fractional energy spread respectively. He also assume a weak, biologically interesting sample, with principal interest lying in the molecular skeleton remaining after obvious hydrogen loss and other radiation damage has occurred.

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