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“爸爸老师”来幼儿园组织活动探析
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作者 万琦 《师道(人文)》 2001年第12期62-63,共2页
关键词 “爸爸老师” 幼儿园 教育教学活动 文化修养 个性培养 教育质量 “性别平衡”
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Nonlinear identification and characterization of structural joints based on vibration transmissibility 被引量:2
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作者 Liu Xin Sun Beibei +2 位作者 Li Lie Chen Jiandong Xue Fei 《Journal of Southeast University(English Edition)》 EI CAS 2018年第1期36-42,共7页
In order to investigate the nonlinear characteristics of structural joint,the experimental setup with a jointed mass system is established for dynamic characterization analysis and vibration prediction,and a correspon... In order to investigate the nonlinear characteristics of structural joint,the experimental setup with a jointed mass system is established for dynamic characterization analysis and vibration prediction,and a corresponding nonlinearity identification method is studied.First,the sine-sweep vibration test with different baseexcitation levels areapplied to the structural joint system to study the dominant modal of mass rigid motion.Then,based on t e harmonic balance method principle,t e measured vibration transmissibilities a e utilized for nonlinearity identification using different excitation levels.Experimental results show that nonlinear spring and damping force can be represented by a polynomial order approximation.The identified nonlinear stiffness and damping force can predict the system’s response,and they can reveal t e shifts of resonant frequency or damping due to discontinuity of contact mechanisms within a certain range. 展开更多
关键词 structural joint vibration transmissibility nonlinear identification harmonic balance method
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Nonlinear identification of systems with parametric excitation 被引量:2
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作者 YE Min DOU SuGuang +1 位作者 ZHANG Wei ZENG ZhiGang 《Science China(Technological Sciences)》 SCIE EI CAS 2011年第8期2080-2089,共10页
In this paper, the incremental harmonic balance nonlinear identification (IHBNID) is presented for modelling and parametric identification of nonlinear systems. The effects of harmonic balance nonlinear identification... In this paper, the incremental harmonic balance nonlinear identification (IHBNID) is presented for modelling and parametric identification of nonlinear systems. The effects of harmonic balance nonlinear identification (HBNID) and IHBNID are also studied and compared by using numerical simulation. The effectiveness of the IHBNID is verified through the Mathieu-Duffing equation as an example. With the aid of the new method, the derivation procedure of the incremental harmonic balance method is simplified. The system responses can be represented by the Fourier series expansion in complex form. By keeping several lower-order primary harmonic coefficients to be constant, some of the higher-order harmonic coefficients can be self-adaptive in accordance with the residual errors. The results show that the IHBNID is highly efficient for computation, and excels the HBNID in terms of computation accuracy and noise resistance. 展开更多
关键词 nonlinear system identification incremental harmonic balance parameter excitation nonlinear systems
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