Search results for: Guofu Zhai

Items from 1 to 20 out of 87 results

article

Life prediction of lithium thionyl chloride batteries based on the pulse load test and accelerated degradation test

Xuerong Ye, Qisen Sun, Wenwen Li, Guofu Zhai

Quality and Reliability Engineering International > 39 > 8 > 3335 - 3349

The lithium thionyl chloride (Li/SOCl₂) battery is widely used as an important long‐life backup power source. Accurate battery life prediction is essential to ensure the reliability of equipment and systems. In this paper, a novel method was proposed for the life prediction of Li/SOCl₂ batteries based on the pulse load test and accelerated degradation test (ADT). The proposed pulse load test method...

article

Model‐based quality consistency analysis of permanent magnet synchronous motor cogging torque in wide temperature range

Cen Chen, Chengzhi Sun, Liqin Wu, Xuerong Ye, more

Quality and Reliability Engineering International > 39 > 8 > 3502 - 3517

Permanent magnet synchronous motors (PMSMs) have a scale of applications linking to the industrial machines. As these machines often work in a wide temperature range, the PMSM quality consistency is threatened by the temperature fluctuate. In fact, at the start of the production of the PMSMs, the quality consistency distribution already exist due to the manufacturing dispersion. However, traditional...

article

A failure mechanism consistency test method for accelerated degradation test

Guofu Zhai, Bokai Zheng, Xuerong Ye, Shuang Si, more

Quality and Reliability Engineering International > 37 > 2 > 464 - 483

Accelerated degradation test (ADT) is generally used to accelerate degradation processes in products to estimate their lifespan and to assess their reliability in a short period of time. How to perform the failure mechanism consistency test is crucial in the application of the ADT method. Existing failure mechanism consistency test methods assume that degradation rates among individual products are...

article

Study on electron beam cross‐linked ethylene‐tetrafluoroethylene copolymer‐insulated cables for aerospace applications: Mechanical performance, crystallization kinetics, and fluoride precipitation

Jun Min, Zhaozeng Tao, Xupeng Song, Jin Zhang, more

Polymers for Advanced Technologies > 29 > 5 > 1497 - 1506

The cross‐linking effects of cross‐linked ethylene‐tetrafluoroethylene copolymer (XETFE)‐insulated cables at different electron beam radiation doses were analyzed in this paper. Evaluation of the mechanical performance of the cables revealed that the highest tensile and breaking elongation was achieved at a radiation dose of 8 × 10⁴ Gy and that XETFE had a good resistance to extreme electron beam...

chapter

Measuring arc temperature distribution and its time-evolution based on relative intensity method

Xue Zhou, Yong Zhang, Guofu Zhai

2017 IEEE Holm Conference on Electrical Contacts > 80 - 85

2017 IEEE Holm Conference on Electrical Contacts

Temperature distribution and its time evolution are fundamental physics of arcs occurring during breaking process in electro-mechanic devices, which largely determine contact erosion. Aimed to the highly fluctuating switching arc, we implemented an optical system based on relatively strength of two individual spectrum emitted by the same excited atoms inside the plasma. Light emitted from arc is firstly...

chapter

The failure mechanism of electromagnetic relay in accelerated storage degradation testing

Zhaobin Wang, Zhoulin Huang, Jiawei Wang, Shang Shang, more

2017 IEEE Holm Conference on Electrical Contacts > 164 - 168

2017 IEEE Holm Conference on Electrical Contacts

The most past research on storage reliability of electromagnetic relay (EMR) only focuses on the measurement of contact resistance. The relay time parameters which reflect main performance function were not monitored. So, in this study the relay time parameters and relay contact resistance were detected simultaneously. The method of prognostics and health management (PHM) was used. According to the...

chapter

Testability design based on relevance of circuit nodes and fault diagnosis

Liying Chen, Guofu Zhai, Xuerong Ye, Kaixin Zhang, more

2017 Prognostics and System Health Management Conference (PHM-Harbin) > 1 - 5

2017 Prognostics and System Health Management Conference (PHM-Harbin)

As an important part of electronic products and systems, the fault prediction and health management of board-level circuits has attracted wide attention and the testability design is the basis of the related studies. In this paper, a new method of testability design based on the correlation of circuit nodes is proposed and used to realize the selection of test points in a high-voltage power supply...

chapter

Simulation and diagnosis of degradation failure on electromagnetic relay

Xuerong Ye, Rao Fu, Yang Wu, Yigang Lin, more

2017 Prognostics and System Health Management Conference (PHM-Harbin) > 1 - 9

2017 Prognostics and System Health Management Conference (PHM-Harbin)

Electromagnetic relay has a high failure rate, which is the severely afflicted area where components and parts easily lose efficacy in the electronic system. Monitoring and evaluation of relay status in key positions are a crucial method to improve operational reliability. Degradation is the significant cause for failure of electromagnetic relay. However, owing to few researches concerning degradation...

chapter

Influence of element parameters on SV-wave EMAT phased arrays directivity

Bao Liang, Guofu Zhai, Kaican Wang, Jinxu Yang

2017 Prognostics and System Health Management Conference (PHM-Harbin) > 1 - 5

2017 Prognostics and System Health Management Conference (PHM-Harbin)

Electromagnetic ultrasonic transducers (EMATs) phased arrays technology is helpful to improve the sensitivity and efficiency of defect detection, and the performance can be evaluated by the directivity of steering beam. The directivity is affected by transducer parameters such as number of elements, element width, and inter-element spacing. Therefore, the effects of element parameters on the directivity...

chapter

In-situ prognostic method of power MOSFET based on miller effect

Cen Chen, Xuerong Ye, Han Wang, Guofu Zhai, more

2017 Prognostics and System Health Management Conference (PHM-Harbin) > 1 - 5

2017 Prognostics and System Health Management Conference (PHM-Harbin)

Power MOSFET plays an important role in power electronic systems, the failure of which will lead to system losing functions. Thus the degradation failure process and mechanism of MOSFET attract wide attention of scholars. However current research works cannot solve the real time degradation monitoring problem of MOSFET. Normally, MOSFET should be removed from the system for testing or monitoring....

article

Online Condition Monitoring of Power MOSFET Gate Oxide Degradation Based on Miller Platform Voltage

Xuerong Ye, Cen Chen, Yixing Wang, Guofu Zhai, more

IEEE Transactions on Power Electronics > 2017 > 32 > 6 > 4776 - 4784

The condition monitoring problem of power devices is significant for diagnostics and prognostics of a switched-mode power supply (SMPS) system. For power <sc>mosfet</sc>, the gate oxide degradation often occurs in various applications. However, there is no online condition monitoring method for gate oxide degradation so far. In this paper, a new precursor that can be used for online condition...

article

Investigation on Arc Dwell and Restriking Characteristics in DC High-Power Relay

Kai Bo, Xue Zhou, Guofu Zhai

IEEE Transactions on Plasma Science > 2017 > 45 > 6 > 1032 - 1042

DC power relay is a key electromechanical component widely used in electrical vehicles, photovoltaics, as well as more-electric aircrafts for energy managing, power conversion, and distribution. As the voltage and current increase due to relay switches, arc discharge becomes an unavoidable and significant issue during the operation of the dc high-power relay. Bridge-type contact and external permanent...

chapter

Evaluation methods of storage reliability for relay based subsystems under the conditions of small samples

Xuerong Ye, Yigang Lin, Rao Fu, Baoxu Dong, more

2017 Annual Reliability and Maintainability Symposium (RAMS) > 1 - 8

2017 Annual Reliability and Maintainability Symposium (RAMS)

Component performance degradation due to the effects of storage environmental conditions causes the degradation of system's performance. Thus, a new evaluation method is proposed in this paper to assess the storage reliability of relay based subsystems (RBSs) under the conditions of small samples. And a practical implementation of the method is carried out to manifest the effectiveness. In which,...

chapter

Over-current performance of movable springs of a latched-type relay used in Watt-hour meters

Xue Zhou, Qingnan Li, Guofu Zhai, Liwen Chen

2016 IEEE 62nd Holm Conference on Electrical Contacts (Holm) > 222 - 227

2016 IEEE 62nd IEEE Holm Conference on Electrical Contacts (Holm)

Latched-type relays used in smart Watt-hour meters need to carry a current some ten times higher than its rated value when a short circuit happens in its testing region. The Holm's repelling force and the static welding are two major challenges faced to the contact system leading by the short circuit current. Movable springs of those relays are usually metal stacks in “V” shape for providing not only...

chapter

Study on thermal characteristics of RF coaxial switch based on finite element method

Le Xu, Sanqiang Ling, Rao Fu, Guofu Zhai

2016 IEEE 62nd Holm Conference on Electrical Contacts (Holm) > 173 - 178

2016 IEEE 62nd IEEE Holm Conference on Electrical Contacts (Holm)

RF (Radio Frequency) coaxial switches have the advantages of high transmission frequency and high power capacity, and are widely used in aerospace, communications, military, science and medical fields. In this paper, a three-dimensional finite element model of a RF coaxial switch was first proposed. The power loss in the contact system when the switch transmits high frequency and power signals was...

chapter

Simulation on dwell stage of arcs in bridge type contacts for high-voltage DC relay

Kai Bo, Xue Zhou, Guofu Zhai, Xinlei Qiao

2016 IEEE 62nd Holm Conference on Electrical Contacts (Holm) > 163 - 166

2016 IEEE 62nd IEEE Holm Conference on Electrical Contacts (Holm)

Bridge-type contacts co-operated with permanent magnet are widely used in 270V/200A DC power relays. The permanent magnet helps to drive the arc out of contact gaps as soon as possible, and also helps to bend and quench the arc rapidly. Arc dwell stage is the first stage between arc ignition and the arc root moves out of the gap. This paper is focused on numerical investigation of dwell stage behaviors...

chapter

Storage reliability assessment for electromechanical components with small sampling based on prior information prediction

Xuerong Ye, Yigang Lin, Rao Fu, Bokai Zheng, more

2016 11th International Conference on Reliability, Maintainability and Safety (ICRMS) > 1 - 8

2016 11th International Conference on Reliability, Maintainability and Safety (ICRMS)

The storage reliability of electromechanical products such as relays and contactors, which are widely used in the aerospace and military fields, will directly affect the performance of the systems in which they are used. For the existing problem of storage reliability assessment for small samples of aerospace relays and other electromechanical products produced on a small scale, a particle filter...

chapter

Parameter design of magnetic latching relays

Huimin Liang, Hao Yu, Guofu Zhai

2016 11th International Conference on Reliability, Maintainability and Safety (ICRMS) > 1 - 9

2016 11th International Conference on Reliability, Maintainability and Safety (ICRMS)

Based on the magnetic circuit method for each component, consider the influence of leakage flux between coils and armatures, establish the equivalent magnetic circuit model of a certain type of magnetic latching relay and get the static attractive force curve. Pick targets for the parameter design by matching the attraction and reaction forces. Use robustness as the parameter design method to optimize...

article

Carbon footprint evaluation of coal-to-methanol chain with the hierarchical attribution management and life cycle assessment

Zhen Qin, Guofu Zhai, Xiaomei Wu, Yunsong Yu, more

Energy Conversion and Management > 2016 > 124 > C > 168-179

Coal is considered as an abundant energy source in China and coal-to-methanol chain is an essential routing on account of methanol’s irreplaceable status in chemical industries. However, coal-based methanol production aroused controversy due to its intensive energy consumption and high greenhouse gas emission, compared with other processes by oil or natural gas. Carbon footprint is an improved indicator...

chapter

Development of a Testing System for Springs Used in Brake Valves for Trains

Xue Zhou, Qingnan Li, Guofu Zhai

2016 Sixth International Conference on Instrumentation & Measurement, Computer, Communication and Control (IMCCC) > 426 - 429

2016 Sixth International Conference on Instrumentation & Measurement, Computer, Communication and Control (IMCCC)

Brake valve springs, such as 104 and F8 valve springs, are essential components in a braking system of a passenger train. Their maintenance quality has a direct impact on the vehicle operation security. In this paper, a new kind of testing system was developed for springs used in brake valves. This system overcame several shortcomings of existing ones and could meet the requirements of new standard...

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RELAYS (20)
ELECTROMAGNETICS (13)
COILS (9)
DEGRADATION (9)
FORCE (9)
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FINITE ELEMENT ANALYSIS (8)
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STRESS (5)
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RELIABILITY (4)
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MEANDER-LINE COIL (3)
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MOSFET (3)
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SOLID STATE RELAY (3)
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THRESHOLD VOLTAGE (3)
TOLERANCE DESIGN (3)
ACCELERATED DEGRADATION TEST (2)
ACOUSTIC EMISSION (2)
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ARC (2)
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LED DRIVER (2)
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MAGNETIC FIELD (2)
MAGNETIC FLUX DENSITY (2)
MAGNETOACOUSTIC EFFECTS (2)
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NONDESTRUCTIVE TESTING (2)
PARTICLE IMPACT NOISE DETECTION (2)
PHM (2)
POLARIZED MAGNETIC SYSTEM (2)
POWER MOSFET (2)
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Search results for: Guofu Zhai

Life prediction of lithium thionyl chloride batteries based on the pulse load test and accelerated degradation test

Model‐based quality consistency analysis of permanent magnet synchronous motor cogging torque in wide temperature range

A failure mechanism consistency test method for accelerated degradation test

Study on electron beam cross‐linked ethylene‐tetrafluoroethylene copolymer‐insulated cables for aerospace applications: Mechanical performance, crystallization kinetics, and fluoride precipitation

Measuring arc temperature distribution and its time-evolution based on relative intensity method

The failure mechanism of electromagnetic relay in accelerated storage degradation testing

Testability design based on relevance of circuit nodes and fault diagnosis

Simulation and diagnosis of degradation failure on electromagnetic relay

Influence of element parameters on SV-wave EMAT phased arrays directivity

In-situ prognostic method of power MOSFET based on miller effect

Online Condition Monitoring of Power MOSFET Gate Oxide Degradation Based on Miller Platform Voltage

Investigation on Arc Dwell and Restriking Characteristics in DC High-Power Relay

Evaluation methods of storage reliability for relay based subsystems under the conditions of small samples

Over-current performance of movable springs of a latched-type relay used in Watt-hour meters

Study on thermal characteristics of RF coaxial switch based on finite element method

Simulation on dwell stage of arcs in bridge type contacts for high-voltage DC relay

Storage reliability assessment for electromechanical components with small sampling based on prior information prediction

Parameter design of magnetic latching relays

Carbon footprint evaluation of coal-to-methanol chain with the hierarchical attribution management and life cycle assessment

Development of a Testing System for Springs Used in Brake Valves for Trains

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