Effects of different carbon sources on the compressive properties of in situ high-volume-fraction TiCx/2009Al composites

	Effects of different carbon sources on the compressive properties of in situ high-volume-fraction TiCx/2009Al composites
	Wang, L.; F. Qiu; S. L. Shu; Q. L. Zhao and Q. C. Jiang
	2016
发表期刊	Powder Metallurgy
卷号	59 期号:5
摘要	In this research, investigations on the closed-loop control stability of adaptive optics systems are conducted by using the Lyapunov approach. As an direct metric of the control stability, the error propagator includes the effects of both the integral gain and the influence matrix and is effective for control-stability evaluation. An experimental 97-element AO system is developed for the control-stability investigation, and the Southwell sensor-actuator configuration rather than the Fried geometry is adopted so as to suppress the potential waffle mode. Because filtering out small singular values of the influence matrix can be used to improve the control stability, the effect of the influence matrix and the effect of the integral gain are considered as a whole by using the error propagator. Then, the control stability of the AO system is evaluated for varying the integral gains and the number of filtered-out singular values. Afterwards, an analysis of the evaluations of the error propagator is made, and a conclusion can be drawn that the control stability can be improved by filtering out more singular values of the influence matrix when the integral gain is high. In other words, the error propagator is useful for trading off the bandwidth error and the fitting error of AO systems in a control-stability approach. Finally, a performance measurement of the experimental AO system is conducted when 13 smaller singular values of the influence matrix are filtered out, and the results show that filtering out a small fraction of the singular values has a minor influence on the performance of this AO system.
文章类型	期刊
收录类别	SCI ; EI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/57239
专题	中科院长春光机所知识产出
推荐引用方式 GB/T 7714	Wang, L.,F. Qiu,S. L. Shu,et al. Effects of different carbon sources on the compressive properties of in situ high-volume-fraction TiCx/2009Al composites[J]. Powder Metallurgy,2016,59(5).
APA	Wang, L.,F. Qiu,S. L. Shu,&Q. L. Zhao and Q. C. Jiang.(2016).Effects of different carbon sources on the compressive properties of in situ high-volume-fraction TiCx/2009Al composites.Powder Metallurgy,59(5).
MLA	Wang, L.,et al."Effects of different carbon sources on the compressive properties of in situ high-volume-fraction TiCx/2009Al composites".Powder Metallurgy 59.5(2016).

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