http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Linfeng Deng (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
-
Linfeng Deng,Rongzhen Zhao 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.4
Feature extraction is the most important step for machine fault diagnosis, but useful features are very difficult to extract from the vibrationsignals, especially for intelligent fault diagnosis based on data-driven technique. An integral method for fault feature extraction basedon local mean decomposition (LMD) and Teager energy kurtosis (TEK) is proposed in this paper. The raw vibration signals are firstprocessed via LMD to produce a group of product functions (PFs). Then, the Teager energies are computed using the derived PFs. Subsequently,each Teager energy data set is directly used to calculate the corresponding TEK. A vibration experiment was performed on arotor-bearing rig with rub-impact fault to validate the proposed method. The experimental results show that the proposed method canextract different TEKs from the mechanical vibration signals under two different operating conditions. These TEKs can be employed toidentify the normal and rub-impact fault conditions and construct a numerical-valued machine fault decision table, which proves that thismethod is suitable for fault feature extraction of the rotor-bearing system.
-
Deng Jianyu,Shen Zhijie,Wang Fumin,Liu Tao,Hong Wenying,Fang Minghua,Wo Linfeng,Chu Sijie 한국응용곤충학회 2022 Journal of Asia-Pacific Entomology Vol.25 No.1
Grapholita molesta (Busck) (the oriental fruit moth; OFM) and Conogethes punctiferalis (Guenée) are both fruit and stem borers with overlapping habitats, occurrences, and outbreak cycles. These two species are in different families and they have completely different sex pheromone components. Here, the effects of the sex pheromone components of C. punctiferalis, (E)-10-hexadecenal (E10-16:Ald) and (Z)-10-hexadecenal (Z10-16:Ald) and their mixture, were evaluated on the sexual communication of OFM by examining electrophysiological (EAG) and behavioral responses. We found that a considerably large amount of E10-16:Ald or Z10-16:Ald and a tiny amount of OFM pheromone elicited comparable EAG responses in OFM males, indicating the low antennal olfactory sensitivity of OFM males to the heterospecific pheromone compounds. In two different peach orchard parcels, captures of OFM by their pheromone lures baited in delta traps were increased by at least 1.5 times when OFM pheromone lures were combined with lures that contained 1000 μg of either E10-16:Ald, Z10-16:Ald or their mixture. In two other pear orchard parcels, both E10-16:Ald and Z10-16:Ald increased captures of OFM in Unitraps in a dose-dependent manner with more than a four-fold increase. Therefore, the enhanced attractiveness of OFM lures by the two interspecific pheromones suggests their potential application to improve mass trapping, population monitoring and mating disruption of OFM.
-
High-power and high-speed semiconductor switch RSD applied in pulsed power system
Lin Liang,Yuehui Yu,Linfeng Deng,Yabin Peng 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
Based on the controllable plasma layer conversion principle, the new-type semiconductor pulsed power switch reversely switched dynistor (RSD) turns on uniformly and simultaneously over the whole chip area. It has the advantages of high power and high speed at the same time. The blocking, turn-on and turn-off characteristics of RSD are investigated in this paper systematically. The off-state and on-state characteristics get a trade-off by an optimal design method. The equations during turn-on and turn-off process are obtained by analyzing the carrier motion on different conditions. Then two important parameters, the turn-on voltage and reverse recovery time, are calculated. In the single pulse experiment, peak currents of 21.6㎄ and 42.0㎄ (pulse widths of 30㎲ and 200㎲) are acquired on 20㎜ and 40㎜ diameter stacks respectively, which have reached the utmost value. In the repetitive frequency experiment, output waveform of 20㎐ is acquired at 4㎸ with a resonant triggering way.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
