[Wang, Gang] Hunan Univ, State Key Lab Adv Design & Mfg Vehicle Body, Changsha 410082, Hunan, Peoples R China.
Metamaterial provides a promising way to control low-frequency noise, but its narrow bandgap limits its applications. To end this, a membrane-type smart metamaterial with multi-modal sound insulation property is studied. The proposed metamaterial consists of an aluminum membrane bonded with multi-modal resonant piezoelectric resonators. Both simulated and experimental results show that the proposed metamaterial can broaden the locally resonant bandgaps because of the effect of the multi-modal resonance (the percent bandwidths are 0.19 and 0.22 for the lowest mode and higher two modes, respectively). Large multi-modal sound insulations (over 37 dB) are obtained around the designed resonant frequencies in low frequency regime (<2000 Hz) with an ultra-thin thickness (over 1000 times thinner than the acoustic wavelength). It is also demonstrated that the excellent sound insulation property can be tuned by simply adjusting the external circuits instead of modifying the structure itself. The underlying mechanism of the unusual sound insulation of the proposed metamaterial is attributed to the negative effective bending stiffness D-eq derived by the effective medium method. In addition, the parametric study shows that the circuital parameters (capacitances) are inversely related to the sound transmission loss of the proposed multi-resonant metamaterial, which benefits the optimization of insulation effect. (C) 2018 Acoustical Society of America.
[秦斌; 王欣] School of Electrical Engineering, Hunan University of Technology, Zhuzhou 412008, China;[王欣; 秦斌; 阳春华] School of Information Science and Engineering, Central South University, Changsha 410083, China
Journal of Control Science and Engineering,2017年2017 ISSN：1687-5249
[He, Jing; Zhang, Changfan; Chu, Houguang; Mi, Lin] College of Electrical and Information Engineering, Hunan University of Technology, Zhuzhou, Hunan, 412007, China;[Mao, Songan] School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN, 47907, United States
Co-ordinate transformation - Equivalence principles - Fault tolerant control - On-line adjustment - Original systems - Sliding mode observers - Sliding mode variable structure - Unknown input disturbances
[何静; 张昌凡] School of Electrics Engineering, Hunan University of Technology, Zhuzhou 412001, China;[姜斌; 胡志坤] College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;[胡志坤; 孙岩] School of Physics and Electronics, Central South University, Changsha 410083, China
[Luo, L. E.; Zhong, C. L.] Dept. Electronics Science and Information Engineering, Hunan University of Technology, Zhuzhou, China;[Wei, P. A.] Dept. Information Technology, Lhasa Teacher school, Tibet, China
2nd International Conference on Material Science, Environmental Science and Computer Science (MSESCS 2012)
AUG 25-26, 2012
Wuhan, PEOPLES R CHINA
[Zhong, C. L.;Luo, L. E.] Hunan Univ Technol, Dept Elect Sci & Informat Engn, Zhuzhou, Peoples R China.
Advanced Materials Research
Al content - Cubic structure - Energy dispersive X ray spectroscopy - Microstructure and mechanical properties - N-compounds - Nanoindentor - Preferred orientations - Reactive magnetron sputtering
[Zeng, Hong-Bing] Hunan Univ Technol, Sch Elect & Informat Engn, Zhuzhou 412007, Peoples R China.;[Zeng, Hong-Bing] Key Lab Elect Drive Control & Intelligent Equipme, Zhuzhou 412007, Peoples R China.
Stability;neutral system;free-matrix-based integral inequality;Lyapunov-Krasovskii functional
The problem of robust stability of uncertain neutral systems with time-delay is studied in this paper. A new free-matrix-based integral inequality is proposed, which is more tighter than existing ones. By using it to investigate the stability of neutral delay systems, less conservative stability conditions are obtained, which are presented in terms of linear matrix inequalities (LMIs). Two numerical examples are provided to illustrate the effectiveness and the reduced conservativeness of the method. (C) 2017 All rights reserved.
[Zeng, Hong-Bing; Xiao, Shen-Ping] School of Electrical and Information Engineering, Hunan University of Technology, Zhuzhou 412007, China;[Yu, Fei] Jiangsu Provincial Key Laboratory for Computer Information Processing Technology, Soochow University, Soochow 215006, China;[Ding, Lei] School of Information Science and Engineering, Jishou University, Jishou 416000, China
The problem of stabilization of Lurie networked control systems (NCSs) is investigated in this paper. The network-induced delays in NCSs are assumed to be time-varying and bounded. By utilizing a reciprocally convex technique to consider the relationship between the network-induced delay and its varying interval, a new absolute stability condition is derived in terms of linear matrix inequalities (LMIs). Based on the obtained condition, an improved cone complementary linearisation (CCL) iteration algorithm is presented to design a state feedback controller. The effectiveness of the proposed method is verified by a numerical example.
International Journal of Control and Automation,2016年9(10):209-218 ISSN：2005-4297
[Liu, Guangming] Hunan Oil Pumb Co., Ltd., Hengdong, 421400, China;[Yuan, Chuanlai; Zhou, Weilong; Kong, Lingshuang] College of Electrical and Information Engineering, Hunan University of Technology, ZhuzhAou, 412007, China
[Wu, Min; He, Yong; Xiao, Shen-Ping] School of Information Science and Engineering, Central South University, Changsha 410083, China;[Xiao, Shen-Ping] School of Electrical and Information Engineering, Hu'nan University of Technology, Zhuzhou 412000, China;[Zhang, Xian-Ming] School of Mathematics Science and Computing Technology, Central South University, Changsha 410083, China
[夏志华; 罗中平; 贺兵] School of Mechanical Engineering, Hunan University of Technology, Zhuzhou 412008, China;[姚亚林] School of Electric and Information Engineering, Hunan University of Technology, Zhuzhou 412008, China