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Acoustic Noise of Brushless DC Motors Induced by Electromagnetic Torque Ripple
Xia, Kun,Li, Zhengrong,Lu, Jing,Dong, Bin,Bi, Chao The Korean Institute of Power Electronics 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.4
Torque ripple is one of the major sources inducing vibration and noise in brushless DC motors. This is especially true in applications such as the spindle motors used in hard disk drives. However, the relationship between torque ripple and acoustic noise/vibration is quite complicated. This paper presents a way to investigate this relationship with acoustic noise measurement and analysis. Results obtained with three different drive modes are used in the analysis. The results show that the acoustic noise analysis is very helpful in designing a high-performance drive strategy for BLDC motors.
Acoustic Noise of Brushless DC Motors Induced by Electromagnetic Torque Ripple
Kun Xia,Zhengrong Li,Jing Lu,Bin Dong,Chao Bi 전력전자학회 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.4
Torque ripple is one of the major sources inducing vibration and noise in brushless DC motors. This is especially true in applications such as the spindle motors used in hard disk drives. However, the relationship between torque ripple and acoustic noise/vibration is quite complicated. This paper presents a way to investigate this relationship with acoustic noise measurement and analysis. Results obtained with three different drive modes are used in the analysis. The results show that the acoustic noise analysis is very helpful in designing a high-performance drive strategy for BLDC motors.
Gao, Jian-Kun,Wang, Li-Xia,Long, Bo,Ye, Xian-Tao,Su, Jing-Na,Yin, Xu-Yuan,Zhou, Xiu-Xia,Wang, Zhi-Wei Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.9
Arsenic trioxide (ATO) has been found to exert anti-cancer activity in various human malignancies. However, the molecular mechanisms by which ATO inhibits tumorigenesis are not fully elucidated. In the current study, we explored the molecular basis of ATO-mediated tumor growth inhibition in pancreatic cancer cells. We used multiple approaches such as MTT assay, wound healing assay, Transwell invasion assay, annexin V-FITC, cell cycle analysis, RT-PCR and Western blotting to achieve our goal. We found that ATO treatment effectively caused cell growth inhibition, suppressed clonogenic potential and induced G2-M cell cycle arrest and apoptosis in pancreatic cancer cells. Moreover, we observed a significant down-regulation of Skp2 after treatment with ATO. Furthermore, we revealed that ATO regulated Skp2 downstream genes such as FOXO1 and p53. These findings demonstrate that inhibition of Skp2 could be a novel strategy for the treatment of pancreatic cancer by ATO.
A Weibo Topic Tracking System based on K-means
Yun Liu,Kun-Peng Xia,Jian-Xun Zhao 보안공학연구지원센터 2014 International Journal of Database Theory and Appli Vol.7 No.6
This article studied weibo text representation. For the weibo features such as short, real-time, colloquialism and originality, in the original vector space model, we propose a suitable method for weibo text representation. Make all the content words as feature words after participation. And we proposed T-TFIDF weight calculation method according to the features of weibo. According to the vector space model, we proposed a weibo adaptive topic tracking methods based on K-means clustering. Simulation analysis shows that, the method can by comparing the similarity micro-blog and sub topic vector set, determine whether weibo belonging to the topic.
The game strategy of the enterprise reliability development
Kun Tian,Chang"an Zhu,Xia Ge,Zhicheng Yao,Lei Li 인하대학교 정석물류통상연구원 2009 인하대학교 정석물류통상연구원 학술대회 Vol.2009 No.10
Due to the increasing importance of equipment reliability and asymmetric information between the military and military enterprises, it is of great practical significance to study equipment reliability. This paper first reviews the current prevalent game model of both entities, and points out its insufficiency. Then, to resolve the problem, the paper constructs a game model based on penalty mechanism and obtains an optimum equilibrium. Finally, this paper makes a detailed analysis on the game strategies of both participants, which provides useful suggestions to the equipment reliability improvement.
A SINGLE-CHIP-COMPUTER-BASED SEISMIC RECORDER
Kun, Liu Gua,Bing, Pang,Qi, Jiang Fa,Hong, Xia 대한전자공학회 1992 HICEC:Harbin International Conference on Electroni Vol.1 No.1
A cost-effective seismic recorder used to record the maximum acceleration and maximum velocity of earthquake strong-motion sequences together with the time of origin is developed. Taking advantages of the single-chip-computer-based design, it provides not only more information storage but also a low-power-comsumption capability and an easy method of data-collecting afterwards.
Benefits Assessment of Large Scale High-speed Rail Network in China
Kun Wang,Wenyi Xia,Anming Zhang 인하대학교 정석물류통상연구원 2017 인하대학교 정석물류통상연구원 학술대회 Vol.2017 No.1
This paper examines the impact of China’s large-scale high-speed rail (HSR) expansion, announced in June 2016, on low-cost carriers (LCCs) and the associated benefits assessment of the expansion program. Our analysis suggests that HSR imposes a greater threat to LCCs than to full service carriers, and the HSR expansion that is intended to reach a great number of small cities has left Chinese LCCs with little survival room, even with full airline market liberalization and sufficient airport capacity. By conducting a “propensity score matching” to pair HSR-linked city pairs in China to the counterfactual US airline routes, we find that most of these Chinese routes would be viable markets for LCCs to operate. The benefits of HSR expansion may thus be overestimated if not recognizing the LCCs’ role as an alternative mode to serve these markets. In particular, for the routes to the central and western China with very small travel demand and high HSR construction cost, LCC service could be more cost efficient and operationally flexible than HSR. Our analysis calls for a more careful evaluation of the program and, more generally, a balanced and coordinated HSR and LCC development in China.
Kun Ma,Guangming Zhuang,Jianwei Xia,Guoliang Chen,Huasheng Zhang 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.9
This paper considers the topic of the observer-based non-fragile mixed passivity and H∞ state feedback control for time-varying delay and norm-bounded parameter uncertainties fuzzy stochastic Markovian jump system subject to quantized measurements. The aim of this paper is to provide a suitable observer-based non-fragile state feedback controller to enhance stochastic stabilization of the closed-loop system and satisfy mixed passivity and H∞ performance. By constructing mode-dependent Lyapunov-Krasovskii functional, novel conditions are achieved in virtue of linear matrix inequalities. Two examples including truck-trailer model are given to illustrate the effectiveness of the developed method.
Oil film deposition characteristics and judgment of lubrication effect of splash lubricated gears
Feng-xia Lu,Kun Wei,Meng Wang,Mou Li,He-yun Bao 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.5
To study the oil film deposition characteristics of splash lubricated gears and determine whether their meshing area is completely lubricated, this study proposes the concept of judging the splash lubrication-deposition characteristics-inlet oil film thickness-lubrication effect. The critical oil film thickness that characterizes the full lubrication of the gear meshing area was obtained as 14.5428 μm by using elastohydrodynamic lubrication (EHL) theory. Based on computational fluid dynamics (CFD) method, based on the renormalization group (RNG) k-ɛ two-equation turbulence model, dynamic mesh model and volume of fluid (VOF) model, the numerical calculation of the intermediate gearbox in splash lubrication is carried out. The oil film deposition thickness of the gear tooth that was about to enter the meshing area was calculated to be 95.6207 μm. It was found that the meshing area is fully lubricated under the rated operating conditions.
Two New α-Pyrones and Other Components from the Cladodes of Opuntia dillenii
Ying Kun Qiu,Yan Yan Zhao,De Qiang Dou,Bi Xia Xu,Ke Liu 대한약학회 2007 Archives of Pharmacal Research Vol.30 No.6
The aqueous ethanolic extract from the fresh cladodes of Opuntia dillenii HAW. was found to show anti-inflammatory activity. Two new α-pyrones, named opuntioside II (1) and opuntioside III (2), were isolated from the extract together with six known compounds. The structures of the new compounds were determined on the basis of chemical and physicochemical evidence.