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Journal articles on the topic 'Fixed frequency hysteretic control'

Author: Grafiati

Published: 4 June 2021

Last updated: 5 February 2022

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1

Awrejcewicz, J., and L. Dzyubak. "Modeling, chaotic behavior, and control of dissipation properties of hysteretic systems." Mathematical Problems in Engineering 2006 (2006): 1–21. http://dx.doi.org/10.1155/mpe/2006/94929.

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In the present work, hysteresis is simulated by means of internal variables. Analytical models of different types of hysteresis loops enable reproduction of major and minor loops and provide good agreement with experimental data. Using an effective algorithm based on the analysis of wandering trajectories, an evolution of chaotic behavior regions of oscillators with hysteresis is presented in various parametric planes. A substantial influence of a hysteretic dissipation value on the form and location of these regions and also restraining and generating effects of the hysteretic dissipation on chaos occurrence are shown. It was demonstrated that for fixed parameters, which govern the shape of a hysteresis loop, the extent of pinch of this loop could be controlled by means of the amplitude and frequency of external periodic excitation.

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2

Song, Qing Shou. "A Hysteretic Current Controller for Active Power Filter (APF) with Constant Frequency." Advanced Materials Research 460 (February 2012): 308–12. http://dx.doi.org/10.4028/www.scientific.net/amr.460.308.

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In accordance with the advantage of conventional hysteresis current control method, this paper advances a novel control method for APF. In conventional hysteresis current control, the hysteresis band (HB) is fixed and actual compensating current is limited in a fixed HB. Firstly, the connection between HB and switching frequency must be found correctly. Then, the variable hysteresis band current controller is designed according to the connection. Finally, the Matlab simulation results show that the switching frequency of VSI is held nearly constant and the proposed controller can track reference current well[1]. The problems of increasing switching losses and audible noise which happened in high-frequency state can be resolved in conventional hysteresis current control.

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3

Zhang, Jun Li, Jian Zhuo Li, and Yu Ren Zhang. "Fixed Frequency Hysteresis Control Based STATCOM." Advanced Materials Research 383-390 (November 2011): 5936–39. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.5936.

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The operation principle of STATCOM (Synchronous Static Compensator - STATCOM) is analyzed. To improve STATCOM response speed, and to sustain the STATCOM main circuit switching device operating frequency stability, the direct current control method is introduced. Fixed frequency hysteresis control method based on the traditional hysteresis control strategy is proposed. The proposed strategy is simple, high precision, fast response speed, while it has less fluctuation with the impact of load parameters, and good robust characteristics.

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4

Sabaghi, Masoud, Mohsen Dashtbayazi, and Saeid Marjani. "Dynamic Hysteresis Band Fixed Frequency Current Control." World Applied Programming 6, no. 1 (March 1, 2016): 1–4. http://dx.doi.org/10.21828/wap-06-01-001.

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5

Sabaghi, Masoud, Mohsen Dashtbayazi, and Saeid Marjani. "Dynamic Hysteresis Band Fixed Frequency Current Control." World Applied Programming 6, no. 1 (March 1, 2016): 1–4. http://dx.doi.org/10.21828/wap0601.001.

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6

Jia, Meng, Zhuochao Sun, and Liter Siek. "Fixed-frequency hysteretic buck converter with novel adaptive window control and transient response improvement." Journal of Engineering 2019, no. 7 (July 1, 2019): 4667–71. http://dx.doi.org/10.1049/joe.2018.5293.

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7

Hoyerby, Mikkel C. W., and Michael A. E. Andersen. "Ultrafast Tracking Power Supply With Fourth-Order Output Filter and Fixed-Frequency Hysteretic Control." IEEE Transactions on Power Electronics 23, no. 5 (September 2008): 2387–98. http://dx.doi.org/10.1109/tpel.2008.2002038.

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8

Zhang, Shuguang, Wenku Shi, and Zhiyong Chen. "Modeling and Parameter Identification of MR Damper considering Excitation Characteristics and Current." Shock and Vibration 2021 (April 7, 2021): 1–17. http://dx.doi.org/10.1155/2021/6691650.

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Smart structures such as damping adjustable dampers made of magnetorheological (MR) fluid can be used to attenuate vibration transmission in vehicle seat suspension. The main research content of this paper is the nonlinearity and hysteresis characteristics of the MR damper. A hysteretic model considering both excitation characteristics and input current is proposed to fit the damper force-velocity curve for the MR damper under different conditions. Multifactor sensitivity analysis based on the neural network method is used to obtain importance parameters of the hyperbolic tangent model. In order to demonstrate the fitting precision of the different models, the shuffled frog-leaping algorithm (SFLA) is employed to identify the parameters of MR damper models. The research results indicate that the modified model can not only describe the nonlinear hysteretic behavior of the MR damper more accurately in fixed conditions, compared with the original model, but also meet the fitting precision under a wide range of magnitudes of control current and excitation conditions (frequency and amplitude). The method of parameter sensitivity analysis and identification can also be used to modify other nonlinear dynamic models.

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9

Hu, Kai-Yu, Shih-Mei Lin, and Chien-Hung Tsai. "A Fixed-Frequency Quasi-${\rm V}^{2}$ Hysteretic Buck Converter With PLL-Based Two-Stage Adaptive Window Control." IEEE Transactions on Circuits and Systems I: Regular Papers 62, no. 10 (October 2015): 2565–73. http://dx.doi.org/10.1109/tcsi.2015.2466791.

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10

Su, Feng, Wing-Hung Ki, and Chi-Ying Tsui. "Ultra Fast Fixed-Frequency Hysteretic Buck Converter With Maximum Charging Current Control and Adaptive Delay Compensation for DVS Applications." IEEE Journal of Solid-State Circuits 43, no. 4 (April 2008): 815–22. http://dx.doi.org/10.1109/jssc.2008.917533.

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11

Badmus, O. O., S. Chowdhury, K. M. Eveker, and C. N. Nett. "Control-Oriented High-Frequency Turbomachinery Modeling: Single-Stage Compression System One-Dimensional Model." Journal of Turbomachinery 117, no. 1 (January 1, 1995): 47–61. http://dx.doi.org/10.1115/1.2835643.

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In this paper, a one-dimensional unsteady compressible viscous flow model of a generic compression system previously developed by the authors is applied to a multistage axial compressor experimental rig configured for single-stage operation. The required model parameters and maps are identified from experimental data. The resulting model is an explicit system of nine first-order ODEs. The model inputs are compressor speed, nozzle area, compressor discharge bleed area, plenum bleed area, inlet total pressure and entropy, and nozzle and bleed exit static pressures. The model and experimental data are compared with respect to both open-loop uncontrolled and closed-loop controlled behaviors. These comparisons focus on (i) forced transients and (ii) global nonlinear dynamics and bifurcations. In all cases the agreement between the model and experimental data is excellent. Of particular interest is the ability of the model, which does not include any hysteretic maps, to predict experimentally observed hysteresis with respect to the onset and cessation of surge. This predictive capability of the model manifests itself as the coexistence of a stable equilibrium (rotating stall) and a stable periodic solution (surge) in the model at a single fixed set of system input values. Also of interest is the fact that the controllers used for closed-loop comparisons were designed directly from the model with no a posteriori tuning of controller parameters. Thus, the excellent closed-loop comparisons between the model and experimental data provide strong evidence in support of the validity of the model for use in direct model based controller design. The excellent agreement between the model and experimental data summarized above is attributed in large part to the use of effective lengths within the model, as functions of axial Mach number and nondimensional compressor rotational speed, as prescribed by the modeling technique. The use of these effective lengths proved to be far superior to the use of physical lengths. The use of these effective lengths also provided substantial improvement over the use of physical lengths coupled with fixed first-order empirical lags, as proposed by other authors for the modeling of observed compressor dynamic lag. The overall success of this model is believed to represent a positive first step toward a complete experimental validation of the approach to control-oriented high-frequency turbomachinery modeling being developed by the authors.

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12

Mei, Jun, Yu Ji, Xiaozhou Du, Tian Ma, Can Huang, and Qinran Hu. "Quasi-Fixed-Frequency Hysteresis Current Tracking Control Strategy for Modular Multilevel Converters." Journal of Power Electronics 14, no. 6 (November 20, 2014): 1147–56. http://dx.doi.org/10.6113/jpe.2014.14.6.1147.

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13

Vahedi, Hani, Abdolreza Sheikholeslami, Mohammad Tavakoli Bina, and Mahmood Vahedi. "Review and Simulation of Fixed and Adaptive Hysteresis Current Control Considering Switching Losses and High-Frequency Harmonics." Advances in Power Electronics 2011 (June 28, 2011): 1–6. http://dx.doi.org/10.1155/2011/397872.

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Hysteresis Current Control (HCC) is widely used due to its simplicity in implementation, fast and accurate response. However, the main issue is its variable switching frequency which leads to extraswitching losses and injecting high-frequency harmonics into the system current. To solve this problem, adaptive hysteresis current control (AHCC) has been introduced which produces hysteresis bandwidth which instantaneously results in smoother and constant switching frequency. In this paper the instantaneous power theory is used to extract the harmonic components of system current. Then fixed-band hysteresis current control is explained. Because of fixed-band variable frequency disadvantages, the adaptive hysteresis current control is explained that leads to fixing the switching frequency and reducing the high-frequency components in source current waveform. Due to these advantages of AHCC, the switching frequency and switching losses will be diminished appropriately. Some simulations are done in MATLAB/Simulink. The Fourier Transform and THD results of source and load currents and the instantaneous switching frequency diagram are discussed to prove the efficiency of this method. The Fourier Transform and THD results of source and load currents are discussed to prove the validity of this method.

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14

Zeng, Jiang, Lin Yang, Yuchang Ling, Haoping Chen, Zhonglong Huang, Tao Yu, and Bo Yang. "Smoothly Transitive Fixed Frequency Hysteresis Current Control Based on Optimal Voltage Space Vector." Energies 11, no. 7 (July 1, 2018): 1695. http://dx.doi.org/10.3390/en11071695.

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15

Bu, Wen Shao, Lei Lei Xu, Xian Bo Wang, and Xin Win Niu. "Double-Hysteresis Current Control Strategy of PWM Rectifier." Applied Mechanics and Materials 433-435 (October 2013): 1037–44. http://dx.doi.org/10.4028/www.scientific.net/amm.433-435.1037.

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to hold the merits of the traditional hysteresis controller, and at the same time, hold back the change of switching frequency and reduce the switching power loss in hysteresis control of PWM rectifier, based on the relationship between line currents and switching status, an improved algorithm of double-hysteresis current control method for three-phase voltage-type PWM converter was proposed. In the strategy, the position of reference voltage vector can be detected by double hysteresis, PLL circuit can detect the output of switching states. The proposed algorithms not only hold the merits of traditional hysteresis, such as quick current response and current limited capacity, but also, it can overcome the drawback of non-fixed switching frequency of traditional hysteresis. The algorithm has been simulated and verified by MATLAB/simulink platform, and the system operates stably.

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16

Xia, Yang, Hai Liang Tao, and Ning Zhang. "An Adaptive Hysteresis Band Controller for Single Phase PV Inverters." Advanced Materials Research 354-355 (October 2011): 1333–37. http://dx.doi.org/10.4028/www.scientific.net/amr.354-355.1333.

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Hysteresis current controllers are widely used in PV inverters. The main drawback of conventional hysteresis current control is that the switching frequency is variable, as the hysteresis band is fixed. In this paper an adaptive band hysteresis control algorithm with no derivative calculation is presented. As it will be shown, this algorithm can limit the switching frequency variation within a small range and the algorithm itself is simple and easy to be implemented. The performance of this algorithm, together with the one [10] and conventional hysteresis control has been evaluated by means of simulations performed with PSIM and SIMULINK. Simulation results show the effectiveness of the suggested hysteresis current controller.

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17

FU, Jian, Yongling FU, Liming YU, Jianwen GUO, Rongrong YANG, and Mingkang WANG. "Digital fixed-frequency hysteresis current control of a BLDC motor applied for aerospace electrically powered actuators." Chinese Journal of Aeronautics 31, no. 6 (June 2018): 1287–97. http://dx.doi.org/10.1016/j.cja.2018.01.001.

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18

Kadum, Arkan A. "New adaptive hysteresis band width control for direct torque control of induction machine drives." International Journal of Power Electronics and Drive Systems (IJPEDS) 11, no. 4 (December 1, 2020): 1908. http://dx.doi.org/10.11591/ijpeds.v11.i4.pp1908-1917.

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This paper presents a new adaptive hysteresis band control approach used in direct torque control (DTC) of the induction motor (IM) drives with the switching tables for the generation of PWM signals. Constant Hysteresis Direct torque control (CHB-DTC) method used the torque and stator flux errors to generate the stator voltage reference and frequency vectors for controlling the three-phase induction motor. The CHB-DTC gives better torque transient performance but it has large steady state ripples. To reduce torque and stator current ripples in CHB-DTC controlled induction motor drives a new adaptive hysteresis band control (AHB) approach is proposed, where the hysteresis band is adapted in real time with the stator flux and torque errors variation, instead of fixed bandwidth. Both classical CHB-DTC method and the proposed adaptive hysteresis band DTC (AHB-DTC) fed three induction motor have been simulated using Matlab/Simulink. The simulation results at different operating conditions over a wide speed range demonstrate the validity, effectiveness, and feasibility of the proposed scheme. The measurements showed that torque ripples were significantly decrease with the new AHB-DTC technique and better speed response in step up or down compared to the CHB-DTC.

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19

Fatiha, Mekri, and Oum El Fadhel Loubaba Bekri. "Fuzzy hysteresis current control of five phase permanent magnet motor under open-circuit faults." International Journal of Engineering & Technology 7, no. 2.28 (May 16, 2018): 369. http://dx.doi.org/10.14419/ijet.v7i2.28.13213.

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This paper presents a new current controller of a PWM of multiphase PM machines with a fuzzy logic band. With this kind of system it is possible to determine optimal currents references which maximize the torque density of the system when one or two phases are open circuited. We propose in this paper to combine this optimal reference current generation with fuzzy hysteresis control band. This solution allows a good tracking of these unconventional reference currents with a fixed switching frequency for the VSI. The study carried on simulation via software MatLab/Simulink.

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20

Liu, Xian Xing, and Rui Wang. "Improvement of DPC of Grid-Connected Inverter for Wind Power System." Applied Mechanics and Materials 220-223 (November 2012): 635–38. http://dx.doi.org/10.4028/www.scientific.net/amm.220-223.635.

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This paper analyzes the principle and properties of the traditional direct power control (DPC) system for the three-phase grid-connected voltage source inverter based on its mathematical model. Hysteresis comparators in power loop of DPC control system, leading to the switching frequency not fixed .the fluctuation of power and DC voltage in temporary state. This paper brought an improved program. The active and reactive powers are calculate by estimating the virtual flux. The AC side voltage sensors could be replaced. The SVPWM has been utilized instead of the power hysteresis and switching table of the traditional DPC system.

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21

Zhong, Shun, and Ziqian Shen. "A Hybrid Constant On-Time Mode for Buck Circuits." Electronics 10, no. 8 (April 14, 2021): 930. http://dx.doi.org/10.3390/electronics10080930.

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To achieve a designed and fixed operating frequency for a controller with high dynamic performance and a high load capacity, a hybrid constant on-time (COT) voltage mode for a Buck circuit is proposed and discussed in this paper. The proposed hybrid strategy is a combination of the classical COT method, a dynamic reference voltage technology and a proportional–differential (PD) module. The workflow is demonstrated in brief, simulations of a Buck circuit with the proposed hybrid COT mode are conducted and comparisons with developed pulse-width modulation (PWM) technology and the hysteresis mode are made. The results show that, with the help of the proposed control scheme, impressive performance from the Buck circuit can be expected. The operating frequency can be fixed well by the hybrid technology without losses of performance and robustness in steady state and will not jump much even with the sudden change of the inputs and the load. The proposed control strategy contributes to the foundation of circuit design and optimization.

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22

Kapat, Santanu. "Parameter-Insensitive Mixed-Signal Hysteresis-Band Current Control for Point-of-Load Converters With Fixed Frequency and Robust Stability." IEEE Transactions on Power Electronics 32, no. 7 (July 2017): 5760–70. http://dx.doi.org/10.1109/tpel.2016.2608913.

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23

Nguyen-Van, Triet, Rikiya Abe, and Kenji Tanaka. "MPPT and SPPT Control for PV-Connected Inverters Using Digital Adaptive Hysteresis Current Control." Energies 11, no. 8 (August 9, 2018): 2075. http://dx.doi.org/10.3390/en11082075.

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Most PV systems are usually controlled by a Maximum Power Point Tracking (MPPT) algorithm to maximize the generated electrical power. However, the maximum power is often unstable and depends on the solar irradiance and temperature. This makes it difficult to control the power grid supply-demand balance due to fluctuations caused by the increase of renewable and variable PV systems. This paper proposes a new control algorithm for a PV-connected inverter called Specified Power Point Tracking (SPPT) control in addition to the conventional Maximum Power Point Tracking (MPPT) control. The PV system is controlled to generate the maximum power or a specified power depending on the electricity transactions comes from the electricity trading system. A high-speed FPGA-based digital adaptive hysteresis current control method, which has fast and stable response and simple structure comparing with the popular Sine-triangle Pulse Width Modulation (SPWM) method, is proposed to implement the MPPT and SPPT control. The adaptive hysteresis current band is calculated adaptively to improve a disadvantage of the classical fixed band hysteresis current control on the varying switching frequency. A reference current used in the adaptive hysteresis current control is calculated such that the output power of the PV-connected inverter is maximized in the MPPT control or is maintained at a given value in the SPPT control. The experimental and simulation results show that the PV-connected inverter under the proposed control algorithm generates the desired power almost exactly and yields stable and fast response despite the varying irradiance.

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24

Chinnappan, Ravichandran, Premalatha Logamani, and Rengaraj Ramasubbu. "Fixed- and variable-frequency sliding mode controller–maximum power point tracking converter for two-stage grid-integrated photovoltaic system employing nonlinear loads with power quality improvement features." Measurement and Control 52, no. 7-8 (May 13, 2019): 896–912. http://dx.doi.org/10.1177/0020294019830120.

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This article presents a reliable and efficient photovoltaic sliding mode voltage-controlled maximum power point tracking DC-DC converter–active power filter integration system to supply real power to grid. This integrated active power filter system performs power quality enhancement features to compensate current harmonics to make distortion-free grid supply current and reactive power employing nonlinear loads. The proposed proportional–integral–derivative–based sliding mode controller is designed with fixed-frequency pulse-width modulation based on equivalent control approach. The main objective of this paper is to design a photovoltaic system with a new sliding surface to force the photovoltaic voltage to follow the reference maximum power point voltage with the alleviation of slow transient response and disadvantages of chattering effects of variable-frequency hysteresis modulation sliding mode controller–maximum power point tracking. The perturbations caused by the uncertainties in climatic conditions and converter output bulk oscillations during grid integration are also mitigated. The features of the proposed photovoltaic–active power filter integration system are confirmed at different operating conditions through PSIM simulation software, and its performance is also compared with a conventional variable-frequency sliding mode-controlled maximum power point tracking. The obtained simulation and experimental results give good dynamic response under various operating conditions of environmental and local load conditions.

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25

Fan, Bo, Zhumu Fu, Kai Michels, and Jiangtao Fu. "Coordinate strategy of dual-pulse-width-modulation converter based on direct power control with load power feed-forward." Measurement and Control 53, no. 5-6 (April 7, 2020): 859–69. http://dx.doi.org/10.1177/0020294020912774.

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The common dual-pulse-width-modulation converter adopts the independent method to control the rectifier and inverter, which has the defects including direct current voltage fluctuation, slow system response and so on. A coordinate strategy of dual-pulse-width modulation based on direct power control with load power feed-forward is proposed in this paper. The fixed switching frequency method with space vector pulse width modulation is provided to overcome the instability of power devices, caused by the hysteresis comparators in the conventional direct power control. With the analysis on the dynamic performance of load power feed-forward coordination, the principle of load power feed-forward is introduced to control the dual-pulse-width-modulation converter. According to the state variable of the alternating current motor, the load power is estimated to construct the feed-forward channel. The experimental results show that the proposed coordinate control method has rapid response, direct current bus voltage fluctuation minimization, lower capacity and unit power factor.

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26

Woafo, Paul, and Abobda Theodore Lejuste. "Modeling, Mathematical and Numerical Studies of a New Biventricular Model for Artificial Heart Powered by an Electromagnet Subjected to Sinusoidal and Square Voltages." International Journal of Artificial Life Research 5, no. 1 (January 2015): 1–26. http://dx.doi.org/10.4018/ijalr.2015010101.

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This paper describes and investigates the dynamics of a new model of biventricular model for artificial heart which consists of two ferromagnetic masses fixed on springs and subjected to a common electromagnet powered by sinusoidal and square wave voltage sources. The effects of the following control parameters are considered: the external voltage source frequency and amplitude, the ratio between the stiffness coefficients, and the one between the masses. As results in both cases of external excitations, subharmonic oscillations, hysteresis, coexistence of limit cycle and point attractor, permanent bounding are found. The optimal voltage and the ratio between the stiffness coefficients are obtained. Bursting oscillations usable for pulsatile pumping are observed for low frequencies under square wave voltage.

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27

Devaraj, D., S. Sakthivel, and K. Punitha. "Fuzzy Adaptive Hysteresis Band Current Controller for Solar Photovoltaic Inverter." Advanced Materials Research 403-408 (November 2011): 4991–99. http://dx.doi.org/10.4028/www.scientific.net/amr.403-408.4991.

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Photovoltaic inverters are important solar energy application. This paper presents a novel Fuzzy Adaptive Hysteresis Current Controller to control the inverter, used in the non-linear time-variant solar photovoltaic cell. The proposed controller has the advantages of both fuzzy as well as adaptive controller. It is capable of reducing the total harmonic distortion and to provide acceptable switching frequency. The mathematical model of Photovoltaic array is developed using the Newton’s method using the parameter obtained from a commercial photovoltaic data sheet under variable weather conditions, in which the effect of irradiance and temperature are considered. The modeled Photovoltaic array is interfaced with DC-DC boost converter, AC-DC inverter and load. A DC-DC boost converter is used to step up the input DC voltage of the Photovoltaic array while the DC-AC single-phase inverter converts the input DC comes from boost converter into AC. The performance of the proposed controller of inverter is evaluated through MATLAB-Simulation. Unlike standard adaptive controller designs, this adaptive fuzzy controller does not require an explicit mathematical model of the system. The results obtained with the proposed algorithm are compared with those obtained when using conventional fixed hysteresis current controller for single-phase photovoltaic inverter in terms of THD and switching frequency.

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28

Qin, Qing Liang, Xiao Hui Yao, and Dian Zhang. "Hysteretic Control Technology in New Flexible HVDC." Applied Mechanics and Materials 740 (March 2015): 495–98. http://dx.doi.org/10.4028/www.scientific.net/amm.740.495.

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The nearest level modulation (NLM) is commonly used in the multi-level multi-module converter (MMC), which need to convert the fractional part of the input sine wave to the digital signal (DPWM). However, the narrow pulse width of digital signal , the frequent change of the digital signal and the frequent instability of output are caused by the sensitive fractional portion of the input, which push Multilevel converter into the position where it has to operate in high frequency and be unstable. In order to solve the problem mentioned above, this paper provides a way called hysteresis comparison to meet the control requirements of precision, adopting the comparison between the fractional part and triangular carrier wave. The approach this study provides is called hysteresis comparison which not only can ensure the stability of the output of the digital signal but also can be able to obtain better digital pulse width by adjusting hysteresis threshold trigger. At the same time, it could ensure the stability and pulse width of the output by means of reducing the frequency of the digital output. The feasibility of this approach has been certified by the simulation of field-programmable gate array (FPGA). Apparently, the actual results show that this method can optimize the control of HVDC Flexible.

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29

Fang, Chung-Chieh, and Richard Redl. "Switching Frequency Determination of DC–DC Converters With Hysteretic Control." IEEE Transactions on Power Electronics 33, no. 3 (March 2018): 2723–29. http://dx.doi.org/10.1109/tpel.2017.2695584.

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30

Yan, Qi, Qu Bo, Yang Jingjie, Mu Yunfei, and Guo Bingqing. "Frequency Control Strategy of Hybrid Energy Storage System for Microgrid Based on Frequency Hysteretic Loop." Energy Procedia 103 (December 2016): 328–32. http://dx.doi.org/10.1016/j.egypro.2016.11.294.

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31

Ge, Teng, Xing-Huai Huang, Ying-Qing Guo, Ze-Feng He, and Zhong-Wei Hu. "Investigation of Mechanical and Damping Performances of Cylindrical Viscoelastic Dampers in Wide Frequency Range." Actuators 10, no. 4 (April 4, 2021): 71. http://dx.doi.org/10.3390/act10040071.

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This paper aims to develop viscoelastic dampers, which can effectively suppress vibration in a wide frequency range. First, several viscoelastic materials for damping performance were selected, and different batches of cylindrical viscoelastic dampers were fabricated by overall vulcanization. Second, the dynamic mechanical properties of the cylindrical viscoelastic dampers under different amplitudes and frequencies are tested, and the hysteretic curves under different loading conditions are obtained. Finally, by calculating the dynamic mechanical properties of the cylindrical viscoelastic dampers, the energy dissipation performance of these different batches of viscoelastic dampers is compared and analyzed. The experimental results show that the cylindrical viscoelastic damper presents a full hysteretic curve in a wide frequency range, in which the maximum loss factor can reach 0.57. Besides, the equivalent stiffness, storage modulus, loss factor, and energy consumption per cycle of the viscoelastic damper raise with the frequency increasing, while the equivalent damping decreases with the increase of frequency. When the displacement increases, the energy consumption per cycle of the viscoelastic damper rises rapidly, and the equivalent stiffness, equivalent damping, storage modulus, and loss factor change slightly.

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32

Nguyen, P.-B., J. W. Sohn, and S.-B. Choi. "Position Tracking Control of a Flexible Beam Using a Piezoceramic Actuator with a Hysteretic Compensator." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 224, no. 10 (April 22, 2010): 2141–53. http://dx.doi.org/10.1243/09544062jmes1927.

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This article presents position tracking control of a flexible beam using a piezoelectric actuator. This is achieved by implementing both a feedforward hysteretic compensator of the actuator and a proportional-integral-derivative (PID) feedback controller. The Preisach model is adopted to develop the feedforward hysteretic compensator. In the design of the compensator, estimated displacement of the piezoceramic actuator is used based on the limiting triangle database that results from collecting data of the main reversal curve and the first-order ascending curves. Modal parameters of the flexible beam, such as natural frequency, are obtained using a finite element method. Experimental implementation is conducted for position tracking control and performance comparison is made among an open-loop feedforward compensator, a PID feedback controller without considering the effect of hysteresis, and a PID feedback controller integrated with the feedforward hysteretic compensator.

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33

Wang, Shiyu, Ruixia Liu, and Lihua Wen. "Adaptive Fixed-Time 6-DOF Coordinated Control of Multiple Spacecraft Formation Flying with Input Quantization." Complexity 2020 (December 30, 2020): 1–16. http://dx.doi.org/10.1155/2020/6672709.

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This paper investigates the fixed-time coordinated control problem of six-degree-of-freedom (6-DOF) dynamic model for multiple spacecraft formation flying (SFF) with input quantization, where the communication topology is assumed directed. Firstly, a new multispacecraft nonsingular fixed-time terminal sliding mode vector is derived by using neighborhood state information. Secondly, a hysteretic quantizer is utilized to quantify control force and torque. Utilizing such a quantizer not only can reduce the required communication rate but also can eliminate the control chattering phenomenon induced by the logarithmic quantizer. Thirdly, a 6-DOF fixed-time coordinated control strategy with adaptive tuning laws is proposed, such that the practical fixed-time stability of the controlled system is ensured in the presence of both upper bounds of unknown external disturbances. It theoretically proves that the relative tracking errors of attitude and position can converge into the regions in a fixed time. Finally, a numerical example is exploited to show the usefulness of the theoretical results.

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Zhu, Zhi Wen, Qing Xin Zhang, and Jia Xu. "Hysteretic Nonlinear Characteristics of Giant Magnetostrictive Sensors." Applied Mechanics and Materials 479-480 (December 2013): 667–71. http://dx.doi.org/10.4028/www.scientific.net/amm.479-480.667.

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Hysteretic nonlinear characteristics of giant magnetostrictive sensor were studied in this paper. Nonlinear difference items were introduced to interpret the hysteresis phenomena of the strain-magnetic field intensity (MFI) curves of giant magnetostrictive material (GMM). The coupling relationship between strain and frequency was obtained in partial least-square regression method to describe the driftage phenomena of the strain-MFI curves of GMM in different frequencies. The mechanical model of giant magnetostrictive sensor was developed, and the nonlinear relationship between output voltage of giant magnetostrictive sensor and input excitation force was obtained. The nonlinear characteristics of giant magnetostrictive sensor were discussed, and the phenomena of accuracy aggravation in high frequency and delay of giant magnetostrictive sensor were explained. The new giant magnetostrictive sensor model has simple form and is easy to be analyzed in theory, which is helpful to measuring and control.

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Wang, Qite, Keming Cheng, Yunsong Gu, and Yonghe Chen. "The lateral force hysteretic characteristic of a pitching slender body without and with synthetic jet control." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 232, no. 9 (May 8, 2017): 1725–38. http://dx.doi.org/10.1177/0954410017703150.

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The lateral hysteretic characteristic generated by asymmetric vortical flow behind the tangent-ogive cylinder is investigated without and with micro synthetic jet control, when the slender body undergoes a large amplitude pitching motion. Experiments are conducted in a low speed wind tunnel of Nanjing University of Aeronautics and Astronautics at a Reynolds number of 46000. The change rule of the instantaneous pressure distribution reflects the aerodynamic characteristic of the whole model. The data of temporal flow file are acquired using particle image velocimetry locked-phase method and present the asymmetric vortices evolution. Results show that asymmetric vortices still exist in the leeward of the slender body during the dynamic pitching motion. However, the asymmetric degree of the vortices distribution, swirling strength and breakdown location are different which is greater in the downward pitching than in the upward pitching, which leads to the lateral force hysteretic phenomenon. In addition, the hysteretic loop expands as the reduced frequency increased. It is an effective method of the flow control that uses micro synthetic jet alternative blow to control the lateral force in the dynamic pitching motion. Furthermore, the lateral force, the pressure distribution and the hysteretic loop shape are changed continuously as the duty cycle of the control signal increased. For the duty cycle of 50%, the vortices distribution, the swirling strength and breakdown location tend to be symmetrical, so the lateral force decreases significantly and the hysteretic loop is eliminated.

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Jeong, Tae-Jin, Yong-Min Jo, Tae-Heon Lee, and Kwang Sub Yoon. "Design of Hysteretic Buck Converter with A Low Output Ripple Voltage and Fixed Switching Frequency in CCM." Journal of the Institute of Electronics and Information Engineers 52, no. 6 (June 25, 2015): 50–56. http://dx.doi.org/10.5573/ieie.2015.52.6.050.

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Chung-Hsien Tso and Jiin-Chuan Wu. "A ripple control buck regulator with fixed output frequency." IEEE Power Electronics Letters 1, no. 3 (September 2003): 61–63. http://dx.doi.org/10.1109/lpel.2003.819643.

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Sha, MaiChao, RuiJin Zhu, and XueJiao Gong. "Fixed frequency Finite Control Set Model Predictive Control For Three-level APF." E3S Web of Conferences 233 (2021): 04028. http://dx.doi.org/10.1051/e3sconf/202123304028.

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Active power filter can compensate harmonic and reactive power, Three level neutral point clamp (ANPC) has the characteristics of low output harmonic and low device loss. The control of three-level active power filter needs to consider multiple objectives. Finite control set model predictive control (FCS-MPC) is a new method which can add constraints and multi-objective control. According to the limit of the switch state, it can track the reference current, which has the characteristics of fast dynamic response and good compensation effect. This method not only keeps the neutral point voltage balance, but also solves the problem of unstable switching frequency.

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Tsiatas, George C., and Dimitra A. Karatzia. "Reliability analysis of the hysteretic nonlinear energy sink in shock mitigation considering uncertainties." Journal of Vibration and Control 26, no. 23-24 (April 5, 2020): 2261–73. http://dx.doi.org/10.1177/1077546320919304.

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The reliability of the hysteretic nonlinear energy sink in shock mitigation is investigated herein. The hysteretic nonlinear energy sink is a passive vibration control device which is coupled to a primary linear oscillator. Apart from its small mass and a nonlinear elastic spring of the Duffing oscillator, it also comprises a purely hysteretic and a linear elastic spring of potentially negative stiffness. The Bouc–Wen model is used to describe the force produced by both the purely hysteretic and linear elastic springs. The hysteretic nonlinear energy sink protects the primary system through the energy pumping mechanism which transfers energy from the primary system and dissipates it in the hysteretic nonlinear energy sink. Three nonlinear equations of motion describe the resulting two-degree-of-freedom system response. The parameters of the system to be considered as uncertain are the natural frequency of the primary system and the hysteretic nonlinear energy sink linear elastic spring, which follow a normal distribution. A reliability analysis is then performed to evaluate the robustness of the coupled system in the presence of uncertainty. Specifically, the reliability index is calculated based on first passage probabilities of distinct dissipation energy level crossings using the Monte Carlo method. Several examples are examined considering various levels of initial input energy, and useful conclusions are drawn concerning the influence of uncertainty in the system robustness.

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Pierfederici, S., J. P. Martin, F. Meybody-Tabar, and B. Davat. "Robust fixed frequency control for parallel connected Forward/Buck converters." European Physical Journal Applied Physics 24, no. 2 (September 16, 2003): 121–38. http://dx.doi.org/10.1051/epjap:2003068.

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Wang, Jing Yue, Hao Tian Wang, and Li Min Zheng. "Chaos Control of Vehicle Nonlinear Suspension System with Multi-Frequency Excitations by Nonlinear Feedback." Applied Mechanics and Materials 55-57 (May 2011): 1156–61. http://dx.doi.org/10.4028/www.scientific.net/amm.55-57.1156.

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Vehicle suspension system with hysteretic nonlinearity has obvious nonlinear characteristics, which directly cause the system to the possibility of existence of bifurcation and chaos. Two degrees of freedom for the 1/4 body suspension model is established and the behavior of the system under road multi-frequency excitations is analyzed. In the paper, it reveals the existence of chaos in the system with the Poincaré map, phase diagram, time history graph, and its chaotic behavior is controlled by nonlinear feedback. Numerical simulation shows the effectiveness and feasibility of the control method with improved ride comfort. The results may supply theoretical bases for the analysis and optimal design of the vehicle suspension system.

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42

Palumbo, Stefano, Mario Chiampi, Oriano Bottauscio, and Mauro Zucca. "Dynamic Simulation of a Fe-Ga Energy Harvester Prototype Through a Preisach-Type Hysteresis Model." Materials 12, no. 20 (October 17, 2019): 3384. http://dx.doi.org/10.3390/ma12203384.

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This paper presents the modeling of an Fe–Ga energy harvester prototype, within a large range of values of operating parameters (mechanical preload, amplitude and frequency of dynamic load, electric load resistance). The simulations, based on a hysteretic Preisach-type model, employ a voltage-driven finite element formulation using the fixed-point technique, to handle the material nonlinearities. Due to the magneto–mechanical characteristics of Fe–Ga, a preliminary tuning must be performed for each preload to individualize the fixed point constant, to ensure a good convergence of the method. This paper demonstrates how this approach leads to good results for the Fe–Ga prototype. The relative discrepancies between experimental and computational values of the output power remain lower than 5% in the entire range of operating parameters considered.

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Ngu, Nguyen Viet, Hong Hua Wang, and Le Thi Minh Tam. "Research on Combined Control Strategy of Three-Phase Photovoltaic Grid-Connected Inverter Based on Fuzzy PI Controller." Advanced Materials Research 347-353 (October 2011): 591–600. http://dx.doi.org/10.4028/www.scientific.net/amr.347-353.591.

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The control objective of three-phase photovoltaic (PV) grid-connected inverter is to generate high quality and stable AC sinusoidal output power with the same phase angle, frequency and amplitude compatible with the grid-connected voltage. To overcome the shortcoming of the normal current PWM control method and traditional PI algorithm, this paper researches a combined control strategy of three phase PV grid-connected inverter based on fuzzy PI controller. The combined control strategy switches different PWM current control method among the hysteretic PWM, SVPWM, hysteretic current SVPWM according to the error between command current and feedback current，and the d-axis command current is output of fuzzy PI controller of DC bus voltage. The simulation model of the combined control strategy for three phase PV grid-connected inverter based on normal PI controller is built with Matlab, simulation results verified the combination control strategy based on fuzzy PI controller has excellent performances.

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Di, Zhengfei, Demin Xu, and Kehan Zhang. "Continuous Control Set Model Predictive Control for an Indirect Matrix Converter." Energies 14, no. 14 (July 8, 2021): 4114. http://dx.doi.org/10.3390/en14144114.

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A continuous control set model predictive power control strategy for an indirect matrix converter is proposed in this paper. The load reactive power, the load active power, and the input reactive power are controlled simultaneously. This control strategy can obtain output waveforms with fixed switching frequency. Additionally, an optimal switching sequence is proposed to simplify the commutations of the indirect matrix converter. To suppress the input filter resonance, an active damping method is proposed. Experimental results prove that the proposed method features controllable input reactive power, controllable load active and reactive power, fixed switching frequency output waveforms, zero-current switching operations, and effectively suppresses input filter resonance.

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Li, Yiqiang. "A Novel Algorithm for Dynamic Control System of Hysteretic Power of Shock Absorber." International Journal of Circuits, Systems and Signal Processing 15 (March 30, 2021): 203–11. http://dx.doi.org/10.46300/9106.2021.15.23.

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Mechanical resonance and high-frequency vibration caused by the external environment will not only affect the performance of vehicles, ships and machinery, but also cause serious harm to human health. In order to pursue higher ride comfort and reduce the adverse effects on the operator when operating the equipment, the shock absorbers are widely used in aircraft, vehicles and other vehicles or precision machinery. The automatic control of the hysteresis power system of the shock absorber is one of the key tasks in the design and application of the shock absorber. With the development and maturity of mechanical automation technology, PLC control technology has been applied in shock absorbers, but PLC control technology is difficult to achieve the requirements of hysteretic control of shock absorbers in the system precision control. Therefore, a novel algorithm for dynamic control system of hysteretic power of shock absorber is presented. The simulation results show that the control system can effectively improve the control accuracy, and the hysteresis output power of the system is closer to the ideal value.

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Ceangu, Vlad, and Dan Cretu. "Functional Model to Estimate the Inelastic Displacement Ratio." Mathematical Modelling in Civil Engineering 13, no. 4 (December 20, 2017): 1–11. http://dx.doi.org/10.1515/mmce-2017-0010.

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Abstract In this paper a functional model to estimate the inelastic displacement ratio as a function of the ductility factor is presented. The coefficients of the functional model are approximated using nonlinear regression. The used data is in the form of computed displacement for an inelastic single degree of freedom system with a fixed ductility factor. The inelastic seismic response spectra of constant ductility factors are used for generating data. A method for selecting ground-motions that have similar frequency content to that of the ones picked for the comparison is presented. The variability of the seismic response of nonlinear single degree of freedom systems with different hysteretic behavior is presented.

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Wang, En Rong, Xiao Qing Ma, S. Rakhela, and C. Y. Su. "Modelling the hysteretic characteristics of a magnetorheological fluid damper." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 217, no. 7 (July 1, 2003): 537–50. http://dx.doi.org/10.1243/095440703322114924.

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A generalized model is proposed to characterize the biviscous hysteretic force characteristics of a magnetorheological (MR) fluid damper using symmetric and asymmetric sigmoid functions on the basis of a fundamental force generation mechanism, observed qualitative trends and measured data under a wide range of control and excitation conditions. Extensive laboratory measurements were performed to characterize the hysteretic force properties of an MR damper under a wide range of magnitudes of control current and excitation conditions (frequency and stroke). The global model is realized upon formulation and integration of component functions describing the preyield hysteresis, saturated hysteresis loop, linear rise and current-induced rise. The validity of the proposed model is demonstrated by comparing the simulation results with measured data in terms of hysteretic forcedisplacement and force-velocity characteristics under a wide range of test conditions. The results revealed reasonably good agreement between the measured data and model results, irrespective of the test conditions considered. The results of the study suggest that the proposed model could be effectively applied for characterizing the damper hysteresis and for development of an optimal controller for implementation in vehicular suspension applications.

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Tarisciotti, Luca, Andrea Formentini, Alberto Gaeta, Marco Degano, Pericle Zanchetta, Roberto Rabbeni, and Marcello Pucci. "Model Predictive Control for Shunt Active Filters With Fixed Switching Frequency." IEEE Transactions on Industry Applications 53, no. 1 (January 2017): 296–304. http://dx.doi.org/10.1109/tia.2016.2606364.

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Abrishamifar, Adib, Ahmad Ahmad, and Mustafa Mohamadian. "Fixed Switching Frequency Sliding Mode Control for Single-Phase Unipolar Inverters." IEEE Transactions on Power Electronics 27, no. 5 (May 2012): 2507–14. http://dx.doi.org/10.1109/tpel.2011.2175249.

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Jiang, Chongxi, Jinghao Zhou, Peng Shi, Wei Huang, and Deqiang Gan. "Ultra-low frequency oscillation analysis and robust fixed order control design." International Journal of Electrical Power & Energy Systems 104 (January 2019): 269–78. http://dx.doi.org/10.1016/j.ijepes.2018.07.010.

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