检索结果-南通市图书馆

Research on Auto-detection for Remainder Particles of aerospace relay Based on Wavelet Analysis

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2007年第1期20卷 75-80页

作者： GAO Hong-liang ZHANG Hui WANG Shu-juan Department of Electrical Engineering Harbin Institute of Technology Harbin 150001 China

aerospace relay is one kind of electronic components which is used widely in national defense system and aerospace system. The existence of remainder particles induces the reliability declining, which has become a severe problem in the development of aerospace relay. Traditional particle impact noise detection （PIND） method for remainder detection is ineffective for small particles, due to its low precision and involvement of subjective factors. An auto-detection method for PIND output signals is proposed in this paper, which is based on direct wavelet de-noising （DWD）, cross-correlation analysis （CCA） and homo-filtering （HF）, the method enhances the affectivity of PIND test about the small particles. In the end, some practical PIND output signals are analysed, and the validity of this new method is proved.

关键词： aerospace relay remainder particles PIND wavelet analysis

Position Optimum Analysis of aerospace relay's Pushing Rod

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2003年第1期16卷 29-35页

作者：翟国富梁慧敏刘茂恺 Department of Electrical Engineering Harbin Institute of Technology Harbin 150001 China

The reliability of aerospace relay directly influences the reliability of thewhole system. The analysis and research on the optimum position of aerospace relay's pushing rodare an important process of aerospace relay reliability design. In the past, most researches weredone for electromagnetic systems and spring systems of aerospace relays. However, there was not anyresearch on the position of the pushing rod. An analytical method for the optimum position ofaerospace relay's pushing rod is presented in this paper. From four aspects, including theelectromagnetic force and torque, work done by the electromagnetic force and displacement, theoptimum position of a pushing rod is investigated based on the analysis of a straight spring *** conclusions can be used to direct the optimum design and assembling of aerospace relays.

关键词： aerospace relay pushing rod reliability spring optimum design

The foundation and analysis of polarized magnetic system’s unified mathematical model in aerospace electromagnetic relay

在线全文

学校读者我要写书评

暂无评论

Journal of Harbin Institute of Technology(New Series) 2007年第4期14卷 561-565页

作者：梁慧敏叶雪荣翟国富郝燕玲刘茂恺 College of Automation Harbin Engineering University School of Electrical Engineering and Automation Harbin Institute of Technology

Polarized magnetic system has a series of features, such as small volume, light weight, low power consumption, high sensitivity, quick movement and so on, widely used in the products of the military aerospace electromagnetic relay. The typical polarized magnetic system has mainly four structures and its simplified equivalent magnetic circuits model is the base of the design of the electromagnetic relay with permanent magnet. In the past, the analysis method that people used was difficult to build the unified mathematical models, which divided the work gap magnetic flux into "permanent magnet flux" and "electromagnetic flux". Based on the analysis method of the work gap magnetic voltage, this paper founds the unified mathematical model of the polarized magnetic system and divides the attractive torque into permanent magnet torque, polarized torque and electromagnetic torque through the energy balance formula. It analyses the influence of permanent magnet sizes on permanent magnet torque, polarized torque and electromagnetic torque through the energy balance formula and the conclusions can direct the design of aerospace electromagnetic relay with permanent magnet.

关键词： aerospace relay polarized magnetic system unified mathematical model attractive torque

A new interpretable fault diagnosis method based on belief rule base and probability table

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2023年第3期36卷 184-201页

作者： Zhichao MING Zhijie ZHOU You CAO Shuaiwen TANG Yuan CHEN Xiaoxia HAN Wei HE High-Tech Institute of Xi’an Xi’an 710025China School of Computer Science and Information Engineering Harbin Normal UniversityHarbin 150025China

It is vital to establish an interpretable fault diagnosis model for critical *** Rule Base(BRB)is an interpretable expert system gradually applied in fault ***,the expert knowledge cannot be utilized to establish the initial BRB accurately if there are multiple referential grades in different fault *** addition,the interpretability of BRB-based fault diagnosis is destroyed in the optimization process,which reflects in two aspects:deviation from the initial expert judgment and over-optimization of *** solve these problems,a new interpretable fault diagnosis model based on BRB and probability table,called the BRB-P,is proposed in this *** with the traditional BRB,the BRB-P constructed by the probability table is more ***,the interpretability constraints,i.e.,the credibility of expert knowledge,the penalty factor and the rule-activation factor,are inserted into the projection covariance matrix adaption evolution strategy to maintain the interpretability of BRB-P.A case study of the aerospace relay is conducted to verify the effectiveness of the proposed method.

关键词： aerospace relay Belief rule base Expert knowledge Fault diagnosis Interpretability constraints