bluuebunny/crossref_metadata_2025_split huggingface dataset:
Fault diagnosis for mechanical system using dynamic Bayesian network
Authors: Pang Tian Yang , Yu Tian Xiang , Song Bi Feng 
Published: February 2021

Abstract
The present study focuses on the fault diagnosis of mechanical systems. Mechanical systems are considered with interconnected components that work together to achieve a common function or purpose. On the one hand, the fault diagnosis result is affected by strong dependence between each component. One the other hand, diagnostic results may be different at different time slices because of the performance degradation of components when the same fault symptoms are given. To deal with these problems in diagnosis, a dynamic Bayesian network (DBN) model is proposed. First, series and parallel systems are converted to a Bayesian network. And the relationship between components and reliability of the system is expressed by the Bayesian network. Then, the dynamic Bayesian network is established to model the dynamic degradation of components in a system under additional information by using the wear data. The parameters of the model are estimated by historical data. Finally, a case is investigated to verify the proposed model in this study. Fault diagnosis is conducted through a backward analysis of the DBN model proposed, and the weakest component is identified. The dynamic probabilities of the mechanical system are obtained through forwarding analysis of the DBN model.
Damage localization in composite plates that exploits edge-reflected Lamb waves
Authors: Zhang Ying , Wang Jianguo , Zeng Liang 
Published: February 2021

Abstract
Lamb waves can travel a relatively long distance in the plate-like structures. Reflection and scattering may occur when they arrive at an obstacle, and the associated wave packets may contain the information about the obstacle and the whole path they travel through. Those extra reflections change the direction once they meet an obstacle, which enlarges the monitoring zone and enriches the inspecting directions. The motivation and objective of this paper is to exploit the information included in these reflections for damage identification. Firstly, dispersion compensation is applied to the residual between the measured signal and the pre-recorded baseline. Thus the propagation distance of each scattered wave packet could be estimated. On this basis, the sparse reconstruction algorithm is modified to adapt to both direct-scattered waves and indirect-scattered waves for damage identification. Two experimental examples are conducted on CFRP laminates, where damage is correctly identified with the minimum sensor array consisting of one transmitter and one receiver.
Influence of a local defect on the cage vibrations for a ball bearing
Authors: Li Shenlong , Jiang Yanhong , Xu Yajun , Liu Jing 
Published: February 2021

Abstract
Impacts will occur when the balls pass through the local defect. The cage vibrations can be affected by the impacts, which may influence the steady state of ball bearing system. Thus, the relationship between defect size and the cage vibrations can be helpful for ascertaining the mechanisms of the cage vibrations. In this paper, a multi-body dynamic model of a ball bearing with a local defect is proposed by using the multibody commercial software. Effects of the defect sizes and inner ring speed on the angular velocity of the cage are studied. The relationship of the contact forces between the balls and bearing components are discussed too. The results show that the multi-body dynamic model can be applied to study the cage vibrations for a defective ball bearing.
An Improved Detection Algorithm of Three-phase Unbalanced Voltage Sag Detection Method for Improving Power Supply Reliability
Authors: Peng C , Hu S L , Hao X H 
Published: February 2021

Abstract
With the popularization of high-power power electronic switching equipment and the technical update of electrical equipment, voltage sags have become a major problem affecting power quality, which seriously affects the reliability of power supply in power systems. In the case where the voltage sags failure cannot be avoided, rapid and accurate detection of the voltage sag has become a key technology for improving the reliability of the power supply of the power system. Based on the symmetrical component method, an improved detection algorithm for three-phase unbalanced voltage sag is proposed in this paper, which can significantly improve the detection speed and the reliability of power supply. The method firstly constructs the virtual orthogonal signal of the grid voltage and uses the symmetric component method to realize the fast and accurate extraction of the positive and negative sequence components of the grid voltage fundamental. In addition, an improved method for constructing virtual orthogonal signals is proposed in this paper, which effectively improves the accuracy of the constructed orthogonal signals. Finally, the feasibility and priority of the improved detection method have been verified by MATLAB/Simulink.
Truncated Sequential Sampling Plans of Electrical Products Having Two Failure Modes
Authors: Yang Xinyu , Chen Guangyu , Tang Ling , Wang Ruiqi , Wu Jie , He Fu , Liang Na 
Published: February 2021

Abstract
It is of great significance to design an economic sampling plan for the electrical products in mega engineering projects. The existing traditional plan normally considers single failure mode of the item being inspected. However, the major products in mega engineering projects usually have different failure modes. To overcome the drawbacks of traditional plans, a truncated sequential sampling plan of electrical products having two failure modes is proposed in this paper. The newly proposed sequential sampling plan takes two different failure modes of an electrical product into consideration, consisting of the sequential sampling scheme for soft-failure mode and the sequential sampling scheme for catastrophic-failure mode. The concept of cut-off line is introduced, limiting the sample size within a certain range. At last, a numerical example is provided. This newly proposed sequential sampling plan provides a reference for the design of economic acceptance sampling plans for expensive electrical products and the products with multi-failure modes.
The Epidemic Prediction of Coronavirus disease 2019 Based on a SEIR(Susceptible-Exposed-Infected-Removed) Model Considering Population Migration between Wuhan and other Provinces in China
Authors: Wang Anran , Zhan Ruobing , Yu Fen , Mi Jie , Gao Kaiye 
Published: February 2021

Abstract
As the first city detected the novel coronavirus in China, Wuhan was quarantined since Jan 23, 2020. The measure effectively prevented the epidemic spreading between provinces in China. This article proposes the SEIR infectious disease dynamics model introduced the inter-provincial migration factor, which is called the SEIRM model. The proposed model analyses the epidemic situation of 7 kinds of people when they can migrate freely between Wuhan and other provinces in China. Using the proposed model, we predict that until March 1st, 2020, the top five most severely epidemic-affected provinces are Hubei Province, Guangdong Province, Henan Province, Hunan Province, and Jiangxi Province; it is also predicted that more than 60.25 million people will be infected and approximately 837 thousand people will die due to this epidemic, which will exceed the medical resources load in China. According to our results, the population migration during the Spring Festival will quickly lead to a large-scale epidemic outbreak in China, which implies that locking down Wuhan and quarantine measures nationwide have a positive effect on China’s epidemic prevention. Epidemic prevention measures will effectively prevent the spread of the epidemic, quickly restore social and economic order, and protect the health of the people of the country.
Test-system design for hydraulic solenoid valve of a certain aircraft
Authors: Zai-Qing Ren , Jian-Hui Wang 
Published: February 2021

Abstract
Based on the test requirement of hydraulic solenoid valve (YDF-16) of a certain aircraft, the test-system of YDF-16 is designed. The test-system consists of a pneumatic unit, a control measure unit and a software unit. It can be used to test the performance parameter of the YDF-16. The test-system is fulfilled the needs of aircraft repair factories and achieves good results in application.
Evaluation of Aerospace Production Site Management and Control Capability based on F-AHP and BP Neural Network
Authors: Jia Fengsheng , Li Hui , Lai Rui , Yao Hongtao , Bao Zhiwen 
Published: February 2021

Abstract
The management and control level of aerospace production site directly affects the production quality of aerospace products. It is one of the important fields of aerospace quality management research to master the management and control ability of aerospace production site efficiently. Based on the analysis of the control scope of aerospace production site, the evaluation index system of space production site control ability is proposed. Through the establishment of Fuzzy-Analytic Hierarchy model, the sample data of process management and control ability evaluation on aerospace production site was collected. BP neural network model was constructed and trained, the output of BP neural network reached the expected accuracy, which meet the requirements of process management and control ability evaluation on aerospace production site. The result shows that the proposed evaluation index system and BP neural network model can not only fully absorb the tacit knowledge of experts, but also reduce the subjective arbitrary defects of artificial weights, which can be used to evaluate of the control ability of aerospace production site efficiently.
Extraction and utilization of satellite products life and reliability data on orbit
Authors: Lv Xinqi , Wang Jingyan , Du Nan 
Published: February 2021

Abstract
Based on the analysis and carding of the reliability and life parameters of satellites, the paper sorted out the on orbit reliability features of various types of satellite products according to the basic concept of reliability. Further, the paper put forward the basic method of reliability feature extraction based on satellite telemetry data. On this basis, the on orbit reliability database of satellite products is designed, which effectively realizes the classified storage and management application of on orbit reliability related information, and provides support for the following on orbit reliability data on orbit life prediction, reliability evaluation and other aspects of utilization.
The wheel-step planetary exploration vehicle with two-way stable obstacle-crossing function
Authors: Zhang Sijia , Yao Jie , Fu Lanting 
Published: February 2021

Abstract
Planetary exploration has always been an important topic in China’s aerospace field. On the rugged planet surface, having a good obstacle-crossing ability is crucial to the mission of the planetary exploration mobile system In this paper, after consulting the data of planetary vehicles at home and abroad, and analyzing the current suspension structure of wheeled planetary exploration vehicles at home and abroad, a six-wheel planetary exploration vehicle with a certain obstacle-crossing capability and capable of bidirectional driving is designed.
Prediction of Spindle Rotation Error through Vibration Signal based on Bi-LSTM Classification Network
Authors: Liang Jianhong , Wang Liping , Wu Jun , Liu Zhigui , Yu Guang 
Published: February 2021

Abstract
One of the important indexes for high-precision machine tools is spindle rotation error, which is closely related to mechanical processing product quality. However, it’s difficult to directly acquire rotation error in the actual machining process. This literature proposed a novel uncompressed approach to predict spindle rotation error through vibration signal based on Bi-LSTM classification network, and this approach mainly consists of three steps, namely, pretreating original data; training Bi-LSTM classification network; predicting spindle rotation error. This approach adopts an uncompressed vibration signal method, which retains the time characteristic information into the predicted network, to build the relationship between easily collected vibration signal and the spindle rotation error. Finally, the proposed approach is applied in a spindle test rig, which has accomplished over 1700 hours of simulated load abrasion, and collected 170 days’ vibration signal and corresponding rotation error at RPM=1000, 2000, 3000, and 4000 conditions. The results show the proposed approach can effectively predict the spindle rotation error.
Flight Reliability Assessment of Assisted Torpedo Based on Probabilistic Risk Assessment
Authors: Wang Xinpeng , Feng Tong , Meng Bo 
Published: February 2021

Abstract
In this paper, a reliability assessment method based on probabilistic risk assessment is proposed to solve the difficulty in the flight reliability evaluation of assisted torpedo. An event chain model is established through the analysis of missions and functions. The relationship between functional events and mission process reliability is described on the basis of event tree. The relationship between component reliability and functional event reliability is analyzed on the basis of fault tree. For the uncertainty of component failure probability, triangle fuzzy number is used to describe the interval representation of component failure probability, and fuzzy fault tree is used to represent the reliability of each functional event. The reliability of the entire flight process is comprehensively evaluated to obtain a realistic flight torpedo flight reliability assessment result.
Prediction model of aeronautics equipment spare parts considering spare part sharing
Authors: Yanluo Geng 
Published: February 2021

Abstract
A prediction method of aeronautics equipment spare parts requirement considering spare part sharing was proposed aimed at reducing high spare parts sharing proportion of similar types of aeronautics equipment. Firstly, according to the structural similarity, the spare parts were divided into special spare parts and shared spare parts. Then, the spare parts requirement under the condition of daily support and wartime support was further considered. With the constraint of spare parts support probability, the requirement prediction model of special spare parts and shared spare parts were constructed respectively on the basic assumption that the daily failure obeyed the exponential distribution and the battle damage-oriented obeyed the binomial distribution. Finally, based on a certain kind of avionics system, the validity and effectiveness of the proposed model were verified.
Research on the Early Warning Method of Water Delivery Pipeline Detonation Based on High-frequency Water Pressure Monitoring
Authors: Xinmin Zhu , Tianxiang Lin , Shaokong Feng , Feng Shang , Zhe Fan 
Published: February 2021

Abstract
In order to study a novel monitoring method suitable for pressure water conveyance project, the fiber grating pressure sensor was adopted for monitoring the water pressure of in-service glass fiber reinforced plastic mortar pipeline. An emptying valve was used in the prototype test to simulate the leakage process and the dynamic water pressure process was recorded effectively by the fiber grating pressure sensor with high frequency and high precision. According to prototype test results, a fluctuation analytical method was proposed, which uses random average pressure as the equilibrium standard value. Meanwhile, an early warning system against pipe failure was developed based on this method. The system was verified by the simulated leakage tests, and the results show that the system could alarm the leakage of more than 0.25% of pipeline design flow, and the positioning accuracy was 10 m–20 m.
An access control model based on matrix domain security label
Authors: Liqing Li , Hai Lu 
Published: February 2021

Abstract
The large complex organization that needs to strictly implement the ‘Need to Know’ secure principle should establish a multi-level security information identification and access control mechanism. In this paper, it proposes that a large-scale complex organization is a matrix structure; hence, a matrix security label that conforms to the characteristics of the matrix domain shall be established. On the basis of RBAC and MLS Model, this paper supplements the definitions of security label and necessary constraints, and thus forms an improved access control model.
Effect of temperature on natural frequencies of bridge structure of metallurgical crane
Authors: Zhao L , Jin H 
Published: February 2021

Abstract
It is an important prerequisite for structural design and structural health monitoring to accurately obtain the natural frequencies and modal shapes of the structures, however, which are not only related to the stiffness and mass of the system itself but also affected by temperature, humidity, load and other factors. Therefore, the effect of environmental factors on the dynamic parameters of the structures should not be ignored in the process of dynamic analysis, especially for the structures which run in the complex environment such as bridge structures of metallurgical cranes. In this paper, two physical fields of solid heat transfer and solid mechanics in COMSOL are used to analyse the dynamic parameters of the bridge structure of a double-beam bridge crane based on the consideration of temperature effect and neglect of temperature effect respectively. The results show that, without considering the influence of ambient temperature on the material of crane bridge structure, whether the temperature effect is taken into account or not has no obvious effect on the form of structural vibration modal shapes. In addition, it can be concluded that the natural frequencies of each stage of crane -bridge structure increase under the condition of considering the influence of service ambient temperature, and the increase of natural frequencies of each stage also increases with the increase of convection air temperature at the bottom of the lower cover plate of the main beam.
Analysis of Uneven Settlement of Large Oil Storage Tank
Authors: Yunxiu Ma , Jian Li , Keqin Ding , Jiwang Zhang 
Published: February 2021

Abstract
The uneven settlement of large oil storage tank will not only cause the tank wall to be elliptical and the upper floating plate to be blocked, but also cause the tank body to fall. In order to study the influence of uneven settlement on the tank structure, this paper takes 50000m3 oil storage tank as an example, uses the finite element simulation method to explore the influence of uneven settlement of different scales of large tank foundation on the overall stress characteristics of the tank, and obtains the storage. The influence of uneven settlement of tank foundation on the mechanics of tank body, tank bottom and large corner joint. It can provide some guidance for tank management and evaluation.
Research on comprehensive evaluation of quality performance of all employees in electronic equipment enterprises based on entropy method and ideal point method
Authors: Zhou Yong , Qin Jian 
Published: February 2021

Abstract
The overall quality evaluation of electronic equipment is helpful to improve product quality and has become an important focus of quality control. Based on the systematic analysis of job characteristics of all employees, sixteen index frames are constructed from four dimensions of knowledge quality, key quality performance, quality reward and punishment and quality innovation. Secondly, the fuzzy value conversion method is designed with the characteristics of the evaluation index value of electronic equipment, the objective weight is determined by the entropy method, and comprehensive evaluation model is also designed by ideal point method. Finally, a case is given to illustrate the implementation process and feasibility of the proposed method, which can provide theoretical and practical guidance for improving quality performance of all employees.
Research on comprehensive evaluation of six “properties” for equipment products incorporating correlate indexes
Authors: Qin Jian , Mei Wenhui , Zhou Yong 
Published: February 2021

Abstract
The six “properties” for equipment products are critical indexes to improve the quality of equipment development and batch production. In view of current difficulties of auditing six “properties” and putting qualitative or quantitative evaluation into practices, this paper analyses interactive characteristics of six “properties” and organically integrates them based on the VIKOR method. Firstly, the indexes and connotation of six “properties” for equipment products have been elaborated. Secondly, specific relationship among six “properties” is analysed and their interactive coefficients are depicted as two additive fuzzy measures. Thirdly, the effect of interactive coefficient among six “properties” is analysed on group utility and individual regret in the VIKOR method, and specific decision-making steps based on the VIKOR method are also proposed. Finally, two illustrative cases show the differences of multiple indexes decision results under two kinds of conditions and the feasibility and effectiveness of the proposed methods.
Study on the Reliability of Mechanical Components of Squib Valve in Passive Nuclear Power Plant
Authors: Qiang Liu , Lechang Zhan , Xiaowei Zhang , Liangming Chang , Jingxian Ma , Xihui Su 
Published: February 2021

Abstract
The action principle of squib valve employed in passive nuclear power plant was introduced and the main factors affecting the reliability of the mechanical components of the squib valve were analyzed, and the shear cover material of the squib valve was subjected to different strain rates at normal temperature, 155 °C and 350 °C, The parameter distribution of Johnson-Cook constitutive model was obtained by fitting the test data, and the impact velocity, material properties and failure strain of the squib valve piston were selected as random variables, and the reliability of the mechanical components of the squib valve was calculated by the joint simulation of ABAQUS+NESSUS. The results show that the reliability of the squib valve is high, and the mechanical performance of the shear cap material is the biggest impact on the mechanical reliability of the squib valve. The mechanical reliability of the squib valve is positively related to the impact speed of the piston. This study provides a reliable basis and reference for quantitative assessment of the overall reliability of the squib valve and the application in passive nuclear power plant.
Environmental Adaptability Assessment of FiberReinforced Composites based on Fuzzy Comprehensive Evaluation Method
Authors: Chen Y , Huang H Z , Qiao Z P , Yang W J , Chen X H , Luo D , Qin Y J , Wu S 
Published: February 2021

Abstract
The environmental adaptability of fiber reinforced composites is affected by different environmental factors. By recording the environmental factors parameters and performance parameters related to the test environment, the main parameters affecting the material properties are obtained by gray correlation analysis on the environmental factors parameters; the main environmental factors affecting the material performance are selected, and the weight of environmental factors is determined by AHP According to the characteristics of environmental factors, a membership function is constructed to evaluate the environmental adaptability of materials when the main parameters of environmental factors are known. At the end of this paper, the effectiveness of the environmental adaptability evaluation method is verified by the test results of similar fiber reinforced composite materials.