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Journal articles on the topic 'PSPICE and closed loop'

Author: Grafiati

Published: 4 June 2025

Last updated: 23 June 2025

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1

Dr.R.Seyezhai and M.UmaMaheswari. "SIMULATION OF A BI-DIRECTIONAL DC-DC CONVERTER FOR PV APPLICATIONS." Electrical & Computer Engineering: An International Journal (ECIJ) 4, no. 2 (2015): 31–42. https://doi.org/10.5281/zenodo.3546958.

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Bi-directional DC-DC converter allows transfer of power between two dc sources, in either direction. In this paper the proposed converter is a combination of two topologies, namely half bridge on the primary and a current fed push pull on the secondary side of a high frequency isolation transformer. Thus providing the desired bi- directional flow of power for battery charging and discharging using only one transformer, as opposed to two in conventional schemes. In this paper, the operation of the converter in charging and discharging modes in open and closed loop is discussed and the simulations results are verified. The circuit configuration has been simulated using PSPICE. Comparisons of the simulation results for open loop and closed loop control system is performed. The results show that closed loop control system reduces distortion and the dynamic response of the converter is improved.

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2

Rakic, Aleksandar, and Trajko Petrovic. "Toward simple robust control of single or current-sharing DC /DC converters driven by deterministic or random switching." Facta universitatis - series: Electronics and Energetics 18, no. 3 (2005): 395–419. http://dx.doi.org/10.2298/fuee0503395r.

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In this paper, the multivariable robust approach is used to obtain simple controllers for both single and current- sharing (paralleled) DC/DC converters. Linear time-invariant nominal model of the power stage is derived and asymptotic uncertainty bounds are constructed to cover the parametric uncertainty, nonlinear effects in control, CMC switching effects and random switching control. Robust model of the current-sharing converters is developed and joint framework for the frequency domain robust design is proposed for both single and current-sharing configurations. The feasibility of the approach is demonstrated by two design examples: random control of the single unit buck converter and deterministic control of the three paralleled buck units. Several robust controllers are designed and verified for robustness and performance in the closed-loop with the Matlab and pSpice models.

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3

Kumar, Ashok, and Sajal K. Paul. "DX-MOCCII Based Fully Cascadable Second Order Current-Mode Universal Filter." Journal of Circuits, Systems and Computers 27, no. 07 (2018): 1850113. http://dx.doi.org/10.1142/s021812661850113x.

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The paper presents a new second-order single input multiple output (SIMO) type current mode (CM) universal filter. The proposed circuit uses two dual-X second generation multi-output current conveyors (DX-MOCCII), two grounded capacitors and three grounded resistors. The circuit configuration realizes low-pass filter (LPF), high-pass filter (HPF), band-pass filter (BPF), notch filter (NF) and all-pass filter (APF) responses simultaneously at different output terminals. The new circuit enjoys the features of low input impedance and high output impedance, which is desirable and useful for cascadability in CM circuits. For realizing the universal filter responses, the proposed circuit configuration does not require matching constraint of passive components and both active and passive sensitivities are found low. In addition, the extension of the proposed circuit as a resistorless universal filter has also been presented. As an application of the proposed filter, inverting band pass output is connected to a negative unity gain current follower in a close loop to design voltage and CM multiphase sinusoidal oscillators (MSOs). Comparison of the proposed configuration with available literature is given. The PSPICE simulation of the filter and its application as MSO are performed to verify the agreement with the theoretical proposition.

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4

Gutiérrez Basulto, Víctor, Jean Christoph Jung, Carsten Lutz, and Lutz Schröder. "A Closer Look at the Probabilistic Description Logic Prob-EL." Proceedings of the AAAI Conference on Artificial Intelligence 25, no. 1 (2011): 197–202. http://dx.doi.org/10.1609/aaai.v25i1.7856.

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We study probabilistic variants of the description logic EL. For the case where probabilities apply only to concepts, we provide a careful analysis of the borderline between tractability and ExpTime-completeness. One outcome is that any probability value except zero and one leads to intractability in the presence of general TBoxes, while this is not the case for classical TBoxes. For the case where probabilities can also be applied to roles, we show PSpace-completeness. This result is (positively) surprising as the best previously known upper bound was 2-ExpTime and there were reasons to believe in completeness for this class.

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5

Schmidt, Lee. "Closed Loop." Annals of Emergency Medicine 75, no. 2 (2020): 307–8. http://dx.doi.org/10.1016/j.annemergmed.2019.10.013.

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6

Agüero, Juan C., Graham C. Goodwin, and Paul M. J. Van den Hof. "A virtual closed loop method for closed loop identification." Automatica 47, no. 8 (2011): 1626–37. http://dx.doi.org/10.1016/j.automatica.2011.04.014.

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7

SUZUKI, Hiromasa. "Closed Loop Engineering." Journal of the Japan Society for Precision Engineering 86, no. 5 (2020): 302–5. http://dx.doi.org/10.2493/jjspe.86.302.

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8

Davy, J. G. "Closed‐loop Soldering." Soldering & Surface Mount Technology 2, no. 3 (1990): 10–27. http://dx.doi.org/10.1108/eb037729.

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9

Loeb, Robert G., and Maxime Cannesson. "Closed-Loop Anesthesia." Anesthesia & Analgesia 124, no. 2 (2017): 381–82. http://dx.doi.org/10.1213/ane.0000000000001640.

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10

Bansal, Vikram K., and Douglas L. Hester. "Closed-Loop Anesthesia." Anesthesia & Analgesia 125, no. 1 (2017): 360–61. http://dx.doi.org/10.1213/ane.0000000000002181.

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11

HU, BAMBI. "A CLOSED LOOP." International Journal of Modern Physics B 21, no. 23n24 (2007): xi—xxx. http://dx.doi.org/10.1142/s0217979207044949.

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12

Absalom, Anthony R., Robin De Keyser, and Michel M. R. F. Struys. "Closed Loop Anesthesia." Anesthesia & Analgesia 112, no. 3 (2011): 516–18. http://dx.doi.org/10.1213/ane.0b013e318203f5ad.

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13

Capdevila-Cortada, Marçal. "Closed-loop optimization." Nature Catalysis 7, no. 2 (2024): 114. http://dx.doi.org/10.1038/s41929-024-01124-5.

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14

Denison, Tim. "IS048 OPTIMIZING PHYSIOLOGICAL CLOSED-LOOP CONTROLLERS (PCLC) IN CLOSED-LOOP NEUROMODULATION." Neuromodulation: Technology at the Neural Interface 28, no. 1 (2025): S26. https://doi.org/10.1016/j.neurom.2024.09.057.

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15

Ingimundarson, Ari, and Tore Hägglund. "Closed-loop performance monitoring using loop tuning." Journal of Process Control 15, no. 2 (2005): 127–33. http://dx.doi.org/10.1016/j.jprocont.2004.06.004.

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16

Choi, Jinyoung, Moonyoung Kwon, and Sung Chan Jun. "A Systematic Review of Closed-Loop Feedback Techniques in Sleep Studies—Related Issues and Future Directions." Sensors 20, no. 10 (2020): 2770. http://dx.doi.org/10.3390/s20102770.

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Advances in computer processing technology have enabled researchers to analyze real-time brain activity and build real-time closed-loop paradigms. In many fields, the effectiveness of these closed-loop protocols has proven to be better than that of the simple open-loop paradigms. Recently, sleep studies have attracted much attention as one possible application of closed-loop paradigms. To date, several studies that used closed-loop paradigms have been reported in the sleep-related literature and recommend a closed-loop feedback system to enhance specific brain activity during sleep, which leads to improvements in sleep’s effects, such as memory consolidation. However, to the best of our knowledge, no report has reviewed and discussed the detailed technical issues that arise in designing sleep closed-loop paradigms. In this paper, we reviewed the most recent reports on sleep closed-loop paradigms and offered an in-depth discussion of some of their technical issues. We found 148 journal articles strongly related with ‘sleep and stimulation’ and reviewed 20 articles on closed-loop feedback sleep studies. We focused on human sleep studies conducting any modality of feedback stimulation. Then we introduced the main component of the closed-loop system and summarized several open-source libraries, which are widely used in closed-loop systems, with step-by-step guidelines for closed-loop system implementation for sleep. Further, we proposed future directions for sleep research with closed-loop feedback systems, which provide some insight into closed-loop feedback systems.

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17

Carranza, Richard G. "The closed-loop economy." International Journal of Design & Nature and Ecodynamics 11, no. 4 (2016): 600–609. http://dx.doi.org/10.2495/dne-v11-n4-600-609.

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18

MOHAMMED FAZAL, M., B. NITHISH KUMAR, and S. SASI KUMAR. "AUTOMATED CLOSED LOOP AQUAPONICS." i-manager’s Journal on Electronics Engineering 11, no. 2 (2021): 29. http://dx.doi.org/10.26634/jele.11.2.18156.

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19

Nilsen, Geir W., and David Di Ruscio. "Closed Loop Subspace Identification." Modeling, Identification and Control: A Norwegian Research Bulletin 26, no. 3 (2005): 151–64. http://dx.doi.org/10.4173/mic.2005.3.3.

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20

Blackstone, Michael O. "CLOSED DUODENAL LOOP PANCREATITIS." Pancreas 4, no. 3 (1989): 393–94. http://dx.doi.org/10.1097/00006676-198906000-00022.

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21

Thabit, Hood, and Roman Hovorka. "Bringing closed-loop home." Current Opinion in Endocrinology & Diabetes and Obesity 21, no. 2 (2014): 95–101. http://dx.doi.org/10.1097/med.0000000000000048.

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22

Weinzimer, Stuart A. "Closed-loop artificial pancreas." Current Opinion in Endocrinology & Diabetes and Obesity 19, no. 2 (2012): 88–92. http://dx.doi.org/10.1097/med.0b013e3283514e6b.

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23

Kraft, M., C. P. Lewis, and T. G. Hesketh. "Closed-loop silicon accelerometers." IEE Proceedings - Circuits, Devices and Systems 145, no. 5 (1998): 325. http://dx.doi.org/10.1049/ip-cds:19982275.

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24

Koch, Linda. "Closed-loop insulin delivery." Nature Reviews Endocrinology 6, no. 5 (2010): 241. http://dx.doi.org/10.1038/nrendo.2010.31.

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25

Oberndorfer, H., and J. Müller. "GOCE closed-loop simulation." Journal of Geodynamics 33, no. 1-2 (2002): 53–63. http://dx.doi.org/10.1016/s0264-3707(01)00054-0.

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26

Forssell, Urban, and Lennart Ljung. "Closed-loop identification revisited." Automatica 35, no. 7 (1999): 1215–41. http://dx.doi.org/10.1016/s0005-1098(99)00022-9.

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27

Zellbeck, Hans. "Closed-loop Emission Control." MTZ worldwide 78, no. 6 (2017): 78. http://dx.doi.org/10.1007/s38313-017-0060-7.

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28

Alexander, Brenton, Joseph Rinehart, Maxime Cannesson, Jacques Duranteau, and Alexandre Joosten. "Closed-loop hemodynamic management." Best Practice & Research Clinical Anaesthesiology 33, no. 2 (2019): 199–209. http://dx.doi.org/10.1016/j.bpa.2019.04.003.

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29

Sidwall, Kati. "The Closed-Loop Revolution." IEEE Power and Energy Magazine 18, no. 2 (2020): 38–46. http://dx.doi.org/10.1109/mpe.2020.2974595.

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30

Rinehart, Joseph, Christine Lee, Maxime Cannesson, and Guy Dumont. "Closed-Loop Fluid Resuscitation." Anesthesia & Analgesia 117, no. 5 (2013): 1110–18. http://dx.doi.org/10.1213/ane.0b013e3182930050.

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31

Liu, Ngai, and Joseph Rinehart. "Closed-Loop Propofol Administration." Anesthesia & Analgesia 122, no. 1 (2016): 4–6. http://dx.doi.org/10.1213/ane.0000000000000665.

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32

Zellbeck, Hans. "Closed Loop Emission Control." MTZ - Motortechnische Zeitschrift 78, no. 6 (2017): 90. http://dx.doi.org/10.1007/s35146-017-0058-3.

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33

Wysocki, Marc, Philippe Jouvet, and Samir Jaber. "Closed loop mechanical ventilation." Journal of Clinical Monitoring and Computing 28, no. 1 (2013): 49–56. http://dx.doi.org/10.1007/s10877-013-9465-2.

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34

Feng, Lin, Chu Wu, Bo Jin, and Zhen Yu Wu. "A Passive Third-Order Cascade PLL Filter." Advanced Materials Research 255-260 (May 2011): 2262–66. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.2262.

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In this paper, the traditional passive loop filter is improved, and a new type of Cascade Third-order filter structure and Graphical Phase Design method is proposed, which greatly simplifies high-order PLL filter’s design, analysis and calculation. According to graphical phase design principle, parameters for cascade third-order filter could be figured out from the given formula, the derived result is simulated in the form of Bode plots and Unit-step response with Pspice software and the loop target under different parameters is compared. Experiments show that this third-order filter could significantly improve the stability of PLL, deeply attenuate the phase detector’s high-frequency noise and is well adapted to the loop gain change. Users can also change the design parameters flexibly according to the system requirements with this filter.

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35

Ren, Z., and G. G. Zhu. "Pseudo-random binary sequence closed-loop system identification error with integration control." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 223, no. 6 (2009): 877–84. http://dx.doi.org/10.1243/09596518jsce794.

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This paper studies the closed-loop system identification (ID) error when a dynamic integral controller is used. Pseudo-random binary sequence (PRBS) q-Markov covariance equivalent realization (Cover) is used to identify the closed-loop model, and the open-loop model is obtained based upon the identified closed-loop model. Accurate open-loop models were obtained using PRBS q-Markov Cover system ID directly. For closed-loop system ID, accurate open-loop identified models were obtained with a proportional controller, but when a dynamic controller was used, low-frequency system ID error was found. This study suggests that extra caution is required when a dynamic integral controller is used for closed-loop system identification. The closed-loop identification framework also has significant effects on closed-loop identification error. Both first- and second-order examples are provided in this paper.

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36

NAGARIA, R. K., RAKESH KUMAR SINGH, and SUBODH WAIRYA. "ON THE NEW DESIGN OF SINUSOID VOLTAGE CONTROLLED OSCILLATORS USING MULTIPLIER IN CFA-BASED DOUBLE INTEGRATOR LOOP." Journal of Circuits, Systems and Computers 19, no. 05 (2010): 939–48. http://dx.doi.org/10.1142/s0218126610006542.

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The design and analysis of some new voltage controlled oscillators with sinewave output are proposed. The configurations are based on the implementation of double-integrator loop (DIL) using the Current Feedback Amplifier (CFA) device. For voltage control of the time constants of the DIL, the ICL-8013 multiplier element has been appropriately utilized in a feedforward/feedback connection within the loop. The oscillation frequency (ωo) is tunable by the d.c. control voltage (Vc) of the multiplier. The active ωo-sensitivity relative to the CFA port errors (ε) is quite low. The VCO practical performance had been tested both with hardware implementation and with PSPICE macromodel simulation, in a typical frequency range of 50 KHz–1.5 MHz.

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37

Fallahzadeh, R., F. Bozzoli, and L. Cattani. "Effect of closed-loop nanochannels on the onset of explosive boiling: a molecular dynamics simulation study." Journal of Physics: Conference Series 2685, no. 1 (2024): 012013. http://dx.doi.org/10.1088/1742-6596/2685/1/012013.

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Abstract As a primary boiling mode, explosive boiling has shown a promising future in many applications and received much research attention. The topology of the solid surface in contact with the liquid, particularly nanostructured surfaces, significantly affects the onset time of explosive boiling of a liquid nanofilm. Most studies investigated explosive boiling on non-closed-loop (parallel) nanochannel surfaces. Here, for the first time, explosive boiling in a closed-loop nanochannel was studied by the non-equilibrium molecular dynamics simulation method. Explosive boiling of liquid argon nanofilm on solid copper surfaces with different topologies, including an ideally smooth, a non-closed-loop, and a closed-loop nanochannel, was simulated. The results showed that, compared with the ideally smooth surface, the onset time of explosive boiling decreased for the non-closed-loop and closed-loop nanochannel surfaces. However, it turned out that compared to the non-closed-loop nanochannel, using the closed-loop nanochannel has an adverse effect on heat flux and the onset time of explosive boiling.

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38

Lehmann, Vera, Franco Noti, Markus Laimer, Christoph Stettler, and Thomas Züger. "Glycaemic outcomes in adults with type 1 diabetes transitioning towards advanced automated insulin delivery systems – a real-world analysis at a Swiss tertiary centre." Swiss Medical Weekly 153, no. 12 (2023): 3501. http://dx.doi.org/10.57187/s.3501.

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AIMS OF THE STUDY: To assess glucose levels in adults with diabetes at a Swiss tertiary hospital when transitioning from insulin delivery with a sensor-augmented pump with (predictive) low-glucose suspend ([P]LGS) to a hybrid-closed loop (HCL) and from a HCL to an advanced hybrid-closed loop (AHCL). METHODS: Continuous glucose monitoring data for 44 adults with type 1 diabetes transitioning from (P)LGS to hybrid-closed loop and from hybrid-closed loop to advanced hybrid-closed loop were analysed, including the percentage of time spent within, below, and above glucose ranges. In addition, a subgroup analysis (n = 14) of individuals undergoing both transitions was performed. RESULTS: The transition from a (P)LGS to a hybrid-closed loop was associated with increased time in range (6.6% [2.6%–12.7%], p <0.001) and decreased time above range (5.6% [2.3%–12.7%], p <0.001). The transition from a hybrid-closed loop to an advanced hybrid-closed loop was associated with increased time in range (1.6% [−0.5%–4.5%], p = 0.046) and decreased time above range (1.5% [–1.8%–5.6%], p = 0.050). Both transitions did not change the time below range. In the subgroup analysis ([P]LGS → HCL → AHCL), the time in range increased from 69.4% (50.3%–79.2%) to 76.5% (65.3%–81.3%) and 78.7% (69.7%–85.8%), respectively (p <0.001). CONCLUSIONS: Glucose levels significantly improved when transitioning from a (P)LGS to a hybrid-closed loop. Glucose levels improved further when switching from a hybrid-closed loop to an advanced hybrid-closed loop. However, the added benefit of an advanced hybrid-closed loop was comparably smaller. This pattern was also reflected in the subgroup analysis.

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39

Deng, Yun Peng, Bo Yang, Xing Jun Wang, and Bo Dai. "The Simulation Analysis of Temperature Effects on System Performance of Silicon Micro-Gyroscope." Applied Mechanics and Materials 529 (June 2014): 375–78. http://dx.doi.org/10.4028/www.scientific.net/amm.529.375.

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The effects of temperature variation on the system performance is discussed in this paper. The temperature characteristic of the natural frequency and quality factor is analyzed theoretically firstly. Then the simulation models of the open-loop drive system, the closed-loop drive system, the closed-loop sense system and the quadrature correction system are constructed to simulate the temperature characteristic of the scale factor and zero bias. The simulation results demonstrate the relative change of the scale factor in the closed-loop drive system, that is 1.35%, almost decreases by 67 times relative to the open-loop drive system and the variation of the zero bias in the closed-loop drive system, that is 0.2789°/s, almost decreases by 364 times relative to the open-loop drive system. At the same time, the relative change of the scale factor in the closed-loop sense system, that is 0.000029%, almost decreases by 46551 times relative to the closed-loop drive system. The variation of the zero bias in the closed-loop sense system, that is 1.2×10-11°/s, almost decreases by 2.3×1010 times relative to the closed-loop drive system, which shows the proposed method is feasible and correct.

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40

Iwasaki, Tetsuya. "Critical open-loop properties for closed-loop performance." IFAC Proceedings Volumes 32, no. 2 (1999): 1850–55. http://dx.doi.org/10.1016/s1474-6670(17)56314-4.

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41

Boughton, Charlotte, and Roman Hovorka. "#We don't have to wait any more Closed-loop systems: transforming the landscape." British Journal of Diabetes 22, Supplement 1 (2022): S85—S89. http://dx.doi.org/10.15277/bjd.2022.374.

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Hybrid closed-loop systems are transforming the clinical management of T1DM. Large randomised controlled trials of hybrid closed-loop systems have demonstrated safety and efﬁcacy, with signiﬁcant improvements in glycaemic control compared to control therapy, and there are now several commercially approved hybrid closed-loop systems available in the UK. There is also a growing body of evidence demonstrating the quality of life beneﬁts associated with hybrid closed-loop systems, both for users and also for parents/caregivers and other family members. We review the clinical evidence supporting currently available hybrid closed-loop systems in the UK and also new systems on the horizon. We discuss the emerging evidence for associated psychosocial beneﬁts of hybrid closed-loop therapy. We also address future challenges around healthcare professional readiness to deliver closed-loop technology and ensuring equitable access across the UK.

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42

Tao, Qi, and Bin Tang. "A High-Linearity Closed-Loop Capacitive Micro-Accelerometer Based on Ring-Diode Capacitance Detection." Sensors 23, no. 3 (2023): 1568. http://dx.doi.org/10.3390/s23031568.

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This paper presents an implementation scheme and experimental evaluation of a high-linearity closed-loop capacitive accelerometer based on ring-diode capacitance detection. By deducing the capacitance detection model of the ring-diode considering the influence of the diode, the existing theoretical model error of the ring-diode is corrected and a closed-loop scheme of reusing the detection electrode and the control electrode of the MEMS die is designed to apply this detection scheme to the parallel-plate accelerometer, which only has three independent electrodes. After analyzing the non-linear problems in the existing closed-loop control schemes, a theoretically absolute linear closed-loop control scheme is proposed, and an integrated closed-loop accelerometer is realized by combining the closed-loop diode detection. The experimental results of the ring-diode detection model are in agreement with the theoretical formula. The non-linearity of the accelerometer within ±1 g after the closed-loop is 130 ppm, compared with 1500 ppm when the open-loop is used.

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43

Fang, Li Na, and Shu Qi Liu. "Study on Value of Information Synergy in Steel Closed-Loop Supply Chain Based on Response Time." Applied Mechanics and Materials 220-223 (November 2012): 285–89. http://dx.doi.org/10.4028/www.scientific.net/amm.220-223.285.

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To study significance of information synergy achievement to steel closed-loop supply chain. Using research of supply chain response time for reference, this paper studied value of information synergy in steel closed-loop supply chain. Profit model of information synergy and profit of steel closed-loop supply chain in a two modes closed-loop supply chain that consisted of one steel enterprise and a seller was constructed in this paper. The result shows that within a certain range, as information synergy increases, benefit of steel closed-loop supply chain increases too. The study has an important role in research on information synergy in steel closed-loop supply chain. It also supports research for information synergy.

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44

Fu, Ke, and James K. Mills. "A Convex Approach Solving Simultaneous Mechanical Structure and Control System Design Problems With Multiple Closed-loop Performance Specifications." Journal of Dynamic Systems, Measurement, and Control 127, no. 1 (2004): 57–68. http://dx.doi.org/10.1115/1.1876493.

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In this paper, a new integrated design method, referred to as the extended multiple simultaneous specification (EMSS) method, is proposed to solve simultaneous mechanical structure and control system design problems in which a set of n multiple closed-loop performance specifications must be simultaneously satisfied. To utilize this approach, all closed-loop performance specifications considered must have the property that they are convex with respect to the closed-loop system transfer matrix. With the proposed approach, a simply implemented two-stage design approach is used to determine a set of open-loop mechanical system design parameters and a closed-loop controller which simultaneously satisfies a set of n closed-loop performance specifications. In the first stage, for each closed-loop performance specification, one “sample system,” i.e., the closed-loop system with one set of mechanical design parameters with a closed-loop controller chosen from the set of all linear controllers, is determined by trial and error, such that the specification is satisfied. In the second stage, the transfer matrix of the final system, which satisfies all n performance specifications, is determined through the convex combination of the transfer matrices of n sample systems. A linear programming problem is solved to give the combination vector for this convex combination. With the closed-loop transfer matrix given, the mechanical design parameters, the closed-loop controller structure and its gains, are solved algebraically. In this paper, we establish conditions for the existence of a solution to this integrated design problem as well as prove that the EMSS approach retains the stability properties of the sample systems. Experimental results of the EMSS method, carried out on a linear positioning system are given, verifying the effectiveness of the proposed method. We note that the proposed EMSS method works well when the number of design parameters to be determined is small. Further, the proposed EMSS method also has some utility as a controller design method, to determine a closed-loop controller that satisfies a set of n multiple closed-loop performance specifications, given a fixed mechanical system structure.

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45

Liu, Guang-Da, Ge Li, and Gang Shen. "Experimental evaluation of the parameter-based closed-loop transfer function identification for electro-hydraulic servo systems." Advances in Mechanical Engineering 9, no. 1 (2017): 168781401668442. http://dx.doi.org/10.1177/1687814016684425.

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Closed-loop systems of an electro-hydraulic servo system including position, acceleration, and force closed-loop systems and their closed-loop transfer functions based on parameter model are adaptive identified using a recursive extended least-squares algorithm. The position and force closed-loop tracking controllers are designed by a proportional–integral–derivative controller and are tuned by the position and force step signals. The acceleration closed-loop tracking controller is designed by a three-variable controller and the three states include position, velocity, and acceleration. Experimental results of the estimated position, acceleration, and force closed-loop transfer functions are performed on an actual electro-hydraulic servo system using xPC rapid prototyping technology, which clearly demonstrate the benefit of the adaptive identification method.

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46

Shi, Feng Long, Jian Cui, Wan Chun Gao, and Ping Fang. "Study on Closed-Loop Quality of Aircraft Maintenance." Applied Mechanics and Materials 713-715 (January 2015): 2348–51. http://dx.doi.org/10.4028/www.scientific.net/amm.713-715.2348.

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Closed-loop management is a management idea and quality mode to deal with and prevent quality question. The paper researched Closed-loop quality of aircraft maintenance in Air Force Army Closed-loop work and aircraft maintenance domain, analyzed the question, kinds and means of aircraft maintenance Closed-loop quality. Finally, we give our answer based on reflected question of the Pilot.

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Farrington, Conor, Zoe Stewart, Roman Hovorka, and Helen Murphy. "Women’s Experiences of Day-and-Night Closed-Loop Insulin Delivery During Type 1 Diabetes Pregnancy." Journal of Diabetes Science and Technology 12, no. 6 (2018): 1125–31. http://dx.doi.org/10.1177/1932296818800065.

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Aims: Closed-loop insulin delivery has the potential to improve day-to-day glucose control in type 1 diabetes pregnancy. However, the psychosocial impact of day-and-night usage of automated closed-loop systems during pregnancy is unknown. Our aim was to explore women’s experiences and relationships between technology experience and levels of trust in closed-loop therapy. Methods: We recruited 16 pregnant women with type 1 diabetes to a randomized crossover trial of sensor-augmented pump therapy compared to automated closed-loop therapy. We conducted semistructured qualitative interviews at baseline and follow-up. Findings from follow-up interviews are reported here. Results: Women described benefits and burdens of closed-loop systems during pregnancy. Feelings of improved glucose control, excitement and peace of mind were counterbalanced by concerns about technical glitches, CGM inaccuracy, and the burden of maintenance requirements. Women expressed varied but mostly high levels of trust in closed-loop therapy. Conclusions: Women displayed complex psychosocial responses to day-and-night closed-loop therapy in pregnancy. Clinicians should consider closed-loop therapy not just in terms of its potential impact on biomedical outcomes but also in terms of its impact on users’ lives.

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Shirinzadeh, Bijan, Umesh Bhagat, and Yanling Tian. "Experimental Study of Laser Interferometry Based Motion Tracking of a Flexure-Based Mechanism." International Journal of Intelligent Mechatronics and Robotics 1, no. 3 (2011): 31–45. http://dx.doi.org/10.4018/ijimr.2011070103.

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This paper presents an experimental study of laser interferometry-based closed-loop motion tracking for flexure-based four-bar micro/nano manipulator. To enhance the accuracy of micro/nano manipulation, laser interferometry-based motion tracking control is established with experimental facility. The authors present and discuss open-loop control, model-based closed-loop control, and robust motion tracking closed-loop control for flexure-based mechanism. A comparative error analysis for closed-loop control with capacitive position sensor and laser interferometry feedback is discussed and presented. Model-based closed-loop control shows improvement in position and motion tracking over open-loop control. Robust control demonstrates high precise and accurate motion tracking of flexure-based mechanism compared to the model-based control. With this experimental study, this paper offers evidence that the laser interferometry-based closed-loop control can minimize positioning and tracking errors during dynamic motion, hence realizing high precision motion tracking and accurate position control.

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Wang, Xiao, Yinshu Yu, Rongting Wang, Xiaojie Zhu, and Yong Xie. "Research on real-time power flow calculation method in closed-loop distribution networks." Journal of Physics: Conference Series 2378, no. 1 (2022): 012075. http://dx.doi.org/10.1088/1742-6596/2378/1/012075.

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Abstract It is less intelligent to calculate the closed-loop power flow of the distribution network by manually inputting the closed-loop power flow parameters. Therefore, it is necessary to study the real-time calculation method of the loop power flow in the distribution network. In this paper, a real-time calculation method is put forward based on the Thévenin’s Theorem. Forward/backward sweep algorithm is used to calculate the power flow of the closed-loop distribution network with the aid of the equivalent impedance and the maximum inrush current. A real-time automatic analysis tool for the closed-loop power flow is developed as well, based on the autonomous decentralized concept. The closed-loop power flow calculation is embedded in the DSCADA system to evaluate the feasibility of the loop-closing operation. Test results show that the proposed method can effectively identify the limit violation conditions within the distribution network, and that the calculation error in closed-loop power flow is small.

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Boughton, Charlotte K., Afroditi Tripyla, Sara Hartnell, et al. "Fully automated closed-loop glucose control compared with standard insulin therapy in adults with type 2 diabetes requiring dialysis: an open-label, randomized crossover trial." Nature Medicine 27, no. 8 (2021): 1471–76. http://dx.doi.org/10.1038/s41591-021-01453-z.

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AbstractWe evaluated the safety and efficacy of fully closed-loop insulin therapy compared with standard insulin therapy in adults with type 2 diabetes requiring dialysis. In an open-label, multinational, two-center, randomized crossover trial, 26 adults with type 2 diabetes requiring dialysis (17 men, 9 women, average age 68 ± 11 years (mean ± s.d.), diabetes duration of 20 ± 10 years) underwent two 20-day periods of unrestricted living, comparing the Cambridge fully closed-loop system using faster insulin aspart (‘closed-loop’) with standard insulin therapy and a masked continuous glucose monitor (‘control’) in random order. The primary endpoint was time in target glucose range (5.6–10.0 mmol l−1). Thirteen participants received closed-loop first and thirteen received control therapy first. The proportion of time in target glucose range (5.6–10.0 mmol l−1; primary endpoint) was 52.8 ± 12.5% with closed-loop versus 37.7 ± 20.5% with control; mean difference, 15.1 percentage points (95% CI 8.0–22.2; P < 0.001). Mean glucose was lower with closed-loop than control (10.1 ± 1.3 versus 11.6 ± 2.8 mmol l−1; P = 0.003). Time in hypoglycemia (<3.9 mmol l−1) was reduced with closed-loop versus control (median (IQR) 0.1 (0.0–0.4%) versus 0.2 (0.0–0.9%); P = 0.040). No severe hypoglycemia events occurred during the control period, whereas one severe hypoglycemic event occurred during the closed-loop period, but not during closed-loop operation. Fully closed-loop improved glucose control and reduced hypoglycemia compared with standard insulin therapy in adult outpatients with type 2 diabetes requiring dialysis. The trial registration number is NCT04025775.

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