Health Condition Evaluation Method for Motorized Spindle Based on Rotation Error and Vibration

2018 ◽  
Author(s):  
Weizheng Chen ◽  
Zhaojun Yang ◽  
Chao Chen ◽  
Fei Chen
Keyword(s):  
Evaluation Method ◽  
Health Condition ◽  
Motorized Spindle ◽  
Rotation Error ◽  
Condition Evaluation

Theoretical Study on Bridge Structure Condition Evaluation Based on Health Monitoring Data

2014 ◽  
Vol 599-601 ◽  
pp. 751-754
Author(s):  
Zhao Lan Wei ◽  
Rui Yu ◽  
Chu Yun Cheng
Keyword(s):  
Evaluation Method ◽  
Monitoring Data ◽  
Evaluation Theory ◽  
Interval Numbers ◽  
Subjective Weight ◽  
Condition Evaluation ◽  
Interval Extension ◽  
Index Variation ◽  
Confidence Degree ◽  
Grade Division

After processed the signals obtained from monitoring system, one theory of condition evaluation was proposed on basis of a new evaluation parameter—index variation. One new condition grade division method was proposed from approximate statistic distribution of index variation, and as per the concept of confidence degree and confidence interval. Because the monitoring data and the standard of condition grade division were all interval numbers, interval extension evaluation theory was adopted to establish the model of condition evaluation. Set-Valued Statistics and gravity center based decision theory were introduced to divide weight into subjective weight and objective weight to make calculation. This evaluation method was found to be reasonable and had good project practicability.

Analysis of Performance Evaluation Index for bridge group networking monitoring and collaborative supervision

2021 ◽  
Author(s):  
Liye Zhang ◽  
Yong He ◽  
Shoushan Cheng ◽  
Guoliang Wang ◽  
Hongwei Ren ◽  
...  
Keyword(s):  
Performance Evaluation ◽  
Evaluation Method ◽  
Field Testing ◽  
Technical Condition ◽  
Evaluation Index ◽  
Technical Problems ◽  
Condition Evaluation ◽  
Bridge Group ◽  
Performance Evaluation Index ◽  
And Performance

<p>With the number of bridges increases, the bridge health monitoring (BHM) technique is developing from single bridge monitoring to collaborative supervision of bridge group. Therefore, there are many technical problems need to be solved especially the performance evaluation index for bridge group network. This paper analyses the performance evaluation index of the bridges and bridge group network, establishes the performance evaluation index for bridge group based on rating factor (RF) and technical condition evaluation index. Based on bridge field testing and monitoring data, bridge technical condition evaluation index and performance evaluation method for bridge group are proposed. A case study demonstrates that the research results provide support for bridge group networking monitoring and collaborative supervision.</p>

scholarly journals Research on Health Evaluation Method of Tank Diesel Engine

2019 ◽  
Vol 2019 ◽  
pp. 1-21
Author(s):  
X.-M. Zhang ◽  
D. X. Zhou ◽  
M. Chen
Keyword(s):  
Fractal Dimension ◽  
Diesel Engine ◽  
Evaluation Method ◽  
Working Condition ◽  
Health Condition ◽  
Health Evaluation ◽  
Quantitative Expression ◽  
Comprehensive Health ◽  
Real Vehicle ◽  
Deceleration Time

The idea of diesel engine health evaluation is put forward, and the calculation flow, fast algorithm, and influencing factors of wavelet fractal dimension are analyzed. Through the real vehicle experiment, the corresponding relationship between the fractal dimension of the wavelet and the health condition of the diesel engine is calculated and analyzed. Three quantitative expression parameters, age health degree, dimension health degree, and comprehensive health degree, are defined considering the age and working condition of diesel engine. Finally, the consistency of health degree with vibration intensity, acceleration time, deceleration time, and fuel consumption was confirmed. It has been proved that it is feasible to evaluate the health of diesel engine with health degree.

scholarly journals Research on Comprehensive Evaluation Method of Transformer Noise Based on AHP Matter Element Model

2021 ◽  
Vol 2137 (1) ◽  
pp. 012057
Author(s):  
Yong Li ◽  
Laibin Yin ◽  
Ping Heng
Keyword(s):  
Evaluation System ◽  
Evaluation Method ◽  
Comprehensive Evaluation ◽  
Element Model ◽  
Comprehensive Evaluation Method ◽  
Condition Evaluation ◽  
Noise Evaluation ◽  
Comprehensive Evaluation System ◽  
Matter Element Model ◽  
Element Theory

Abstract Aiming at the problem of transformer condition evaluation, a comprehensive evaluation system for transformer noise is constructed according to the mechanism of transformer noise generation and propagation. Using matter-element theory and AHP, a state analysis method for transformer noise evaluation based on AHP matter-element model is proposed. The case analysis proves that the method is feasible for non-contact evaluation of transformer faults, and can accurately evaluate the state of the transformer, providing guidance for the operation and maintenance of the transformer.

Long-term condition evaluation for stay cable systems using dead load–induced cable forces

2019 ◽  
Vol 22 (7) ◽  
pp. 1644-1656 ◽  
Author(s):  
Yuan Ren ◽  
Xiang Xu ◽  
Qiao Huang ◽  
Dan-Yang Zhao ◽  
Juan Yang
Keyword(s):  
Relative Error ◽  
Evaluation Method ◽  
Maximum Relative Error ◽  
Stay Cable ◽  
Dead Load ◽  
Term Condition ◽  
Condition Evaluation ◽  
Cable Systems ◽  
Cable Forces

To ensure the safety of cable-stayed bridges, a long-term condition evaluation method has been proposed based on dead load–induced cable forces. To extract dead load–induced cable forces under random vehicle loadings, a novel approach is first developed by integrating influence lines with monitoring data. Then, based on the extracted dead load–induced cable forces, the evaluation algorithm for stay cable systems is presented. In the assessment algorithm, uniform and non-uniform characteristics are taken into account. Finally, the Third Nanjing Yangtze River Bridge, a typical large span cable-stayed bridge, is used to illustrate the effectiveness of the proposed methodology. As a result, the maximum relative error in extraction of dead load–induced cable forces accounts for 4.78% within the studied five stay cables. The precision of the extraction method is acceptable for practical applications since the relative error is less than 5%. Moreover, the bridge is continuously assessed using the dead load–induced cable forces for 5 years. Eliminating the influence of vehicle loadings, the condition of the bridge gradually degrades with time but still remains in good condition. The study not only provides a long-term condition evaluation method for stay cable systems but a dead load–induced extraction approach under random vehicle loadings, which will help bridge owners know well the condition of bridges to make appropriate maintenance decisions.

Research on Condition Evaluation Method of Relay Protection Based on Reliability Indices

2013 ◽  
Vol 373-375 ◽  
pp. 1509-1513
Author(s):  
Huan Ren ◽  
Yan Xu ◽  
Qing Jie Zhou
Keyword(s):  
Failure Rate ◽  
Evaluation System ◽  
Evaluation Method ◽  
Relay Protection ◽  
Protective Device ◽  
Secondary Circuit ◽  
Repair Work ◽  
Reliability Indices ◽  
Condition Evaluation

A method for condition evaluation based on reliability indices is proposed in this paper. The paper defines the reliability indices: failure rate, MTBF and availability. The condition evaluation system is proposed based on the contents of repair work and the structures of both protective device and the secondary circuit. The reliability indices are applied to evaluating the protection condition.

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