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A Study on Parallel Force/Position Control Applied to Hybrid Electro-Hydrostatic Actuators
Dinh Quang Truong1,Ahn Kyoung Kwan 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Hydraulic power systems and actuators play an important role in modern industry. In order to improve the control performance of electro-hydrostatic actuator (EHA), the aim of this paper is to propose a novel parallel control strategy named parallel self tuning Quantitative Feedback Theory (PSTQFT) to apply to control force and position of a new kind of hydraulic experimental system named electro-hydrostatic load simulator (EHLS). The PSTQFT controller is designed based on QFT technique for both the force and position control of the EHLS. Then the parameters of the PSTQFT force and position controller are automatically tuned online to minimize the system error by using gradient descent method and speed up convergence. Experiments are carried out to evaluate the effectiveness of the proposed parallel force and position control method applied to the EHLS system.
Truong, Hai An,Lee, Won Je,Jeong, Chan Young,Tr1ecb,nh, Cao S1a1,n,Lee, Seokjin,Kang, Chon-Sik,Cheong, Young-Keun,Hong, Suk-Whan,Lee, Hojoung Elsevier 2018 Journal of plant physiology Vol.231 No.-
<P><B>Abstract</B></P> <P>Plants require nitrogen (N) for growth and development. However, they are frequently exposed to conditions of nitrogen deficiency. In addition, anthocyanin accumulation is induced under salt stress and nitrate deficiency. To date, most studies have revealed that nitrate deficiency under high sucrose levels induce high levels of anthocyanin accumulation in plants. However, the underlying mechanisms remain unclear. Under nitrate-starved conditions, plant growth rapidly worsens and cells eventually die. In addition, plants are severely affected by salt exposure. Therefore, in this study, we determined whether increased levels of anthocyanin could improve plant growth under salt stress and nitrate-starved conditions. We used <I>PAP1-D/fls1ko</I> and <I>ttg1</I> plants which have a perturbed anthocyanin biosynthesis pathway to explore the role of anthocyanin in plant adaptation to nitrate-deficient conditions and salt stress. Our results demonstrate that high anthocyanin accumulation in <I>PAP1-D/fls1ko</I> plants confers enhanced tolerance to nitrate-deficient conditions combined with high salinity. <I>PAP1-D/fls1ko</I> plants appeared to use absorbed nitrate efficiently during the nitrate reduction process. In addition, nitrate-related genes such as <I>NRT1.1, NiA1</I> and <I>NiA</I>2 were upregulated in the <I>PAP1-D/fls1ko</I> plants. On the basis of these findings, it can be concluded that high anthocyanin accumulation helps plants to cope with salt stress under nitrate-deficient conditions via the effective utilization of nitrate metabolism.</P>