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Journal articles on the topic 'Hybrid Maximum Principle'

Author: Grafiati
Published: 13 April 2024

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1

Dmitruk, A. V., and A. M. Kaganovich. "The Hybrid Maximum Principle is a consequence of Pontryagin Maximum Principle." Systems & Control Letters 57, no. 11 (2008): 964–70. http://dx.doi.org/10.1016/j.sysconle.2008.05.006.

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2

Fontaine, C., S. Delprat, TM Guerra, S. Paganelli, and J. F. Duguey. "Improving micro hybrid vehicles performances with the Maximum Principle." IFAC Proceedings Volumes 44, no. 1 (2011): 9727–32. http://dx.doi.org/10.3182/20110828-6-it-1002.02099.

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3

Grammel, G. "Maximum Principle for a Hybrid System Via Singular Perturbations." SIAM Journal on Control and Optimization 37, no. 4 (1999): 1162–75. http://dx.doi.org/10.1137/s0363012998332640.

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4

IMAE, Joe, Masayuki NAKA, and Tomoaki KOBAYASHI. "1215 Hybrid Maximum Principle Using Time-Axis Slide Method." Proceedings of Conference of Kansai Branch 2012.87 (2012): _12–15_. http://dx.doi.org/10.1299/jsmekansai.2012.87._12-15_.

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5

Faragó, I., R. Horváth, and S. Korotov. "Discrete maximum principle for linear parabolic problems solved on hybrid meshes." Applied Numerical Mathematics 53, no. 2-4 (2005): 249–64. http://dx.doi.org/10.1016/j.apnum.2004.09.001.

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Lv, Siyu, Jie Xiong, and Wen Xu. "Stochastic maximum principle for hybrid optimal control problems under partial observation." Systems & Control Letters 181 (November 2023): 105651. http://dx.doi.org/10.1016/j.sysconle.2023.105651.

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7

Wang, Gang. "Design and Simulation of Stand-Alone Wind-Solar Hybrid Generating System." Applied Mechanics and Materials 260-261 (December 2012): 224–30. http://dx.doi.org/10.4028/www.scientific.net/amm.260-261.224.

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A modularized stand-alone hybrid generating system is designed and its composition and working principle is illustrated; working principle of components of wind driven generator, photovoltaic array, storage battery and controller etc. are expounded and corresponding mathematical model is established. In addition, tracking and control measures of the maximum power point based on maximum power given method and perturbation and observation method is proposed and design of software of the system is offered. Finally, simulation of the system is studied based on SIMULINK, resulting in that the syste
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Djabbarova, Aygun, and Kamil Mansimov. "Necessary optimality conditions of singular control in a Rosser type hybrid systems control problem." Applied Mathematics and Control Sciences, no. 3 (October 9, 2018): 31–49. http://dx.doi.org/10.15593/2499-9873/2018.3.03.

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We study one hybrid systems optimal control problem the Rosser type. An analog of the Pontryagins maximum principle is established. The case of degeneracy (a singular case) of the analog Pontryagins maximum condition is considered.
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AKOUR, S. N., and J. F. NAYFEH. "DEFENSE HOLE DESIGN FOR UNIAXIAL DOMINANT HYBRID LOAD FOR INFINITE PLATE." International Journal of Applied Mechanics 03, no. 03 (2011): 607–23. http://dx.doi.org/10.1142/s1758825111001159.

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A baseline data for designing optimum Defense Hole System (DHS) for tension dominant hybrid load (Tensile/Shear > 25%) is obtained. Maximum stress reduction and optimum DHS parameters are achieved. The maximum stress reduction achieved range from 15% up to nearly 18% based on the principle stress ratio (25% < Tensile/Shear < 100%). This reduction is available by introducing auxiliary circular holes, i.e., DHS, along the principal stress direction. A two-DHS is shown to be the optimum for tensile dominant loaded plate. Two major goals are achieved by introducing such defense system: ma
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Andriy Viktorovich, Goncharenko. "Hybrid-Optional Effectiveness Functions Entropy Conditional Extremization Doctrine Contributions into Engineering Systems Reliability Assessments." Transactions on Aerospace Research 2019, no. 2 (2019): 90–100. http://dx.doi.org/10.2478/tar-2019-0012.

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Abstract In this publication a Doctrine for the Conditional Extremization of the Hybrid-Optional Effectiveness Functions Entropy is discussed as a tool for the Reliability Assessments of Engineering Systems. Traditionally, most of the problems having been dealt with in this area relate with the probabilistic problem settings. Regularly, the optimal solutions are obtained through the probability extremizations. It is shown a possibility of the optimal solutions “derivation”, with the help of a model implementing a variational principle which takes into account objectively existing parameters an
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Fujino, A., N. Ueda, and K. Saito. "Semisupervised Learning for a Hybrid Generative/Discriminative Classifier based on the Maximum Entropy Principle." IEEE Transactions on Pattern Analysis and Machine Intelligence 30, no. 3 (2008): 424–37. http://dx.doi.org/10.1109/tpami.2007.70710.

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12

Hoteit, H., R. Mosé, B. Philippe, Ph Ackerer, and J. Erhel. "The maximum principle violations of the mixed-hybrid finite-element method applied to diffusion equations." International Journal for Numerical Methods in Engineering 55, no. 12 (2002): 1373–90. http://dx.doi.org/10.1002/nme.531.

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13

Bayen, Térence, Kenza Boumaza, and Alain Rapaport. "Necessary optimality condition for the minimal time crisis relaxing transverse condition via regularization." ESAIM: Control, Optimisation and Calculus of Variations 27 (2021): 105. http://dx.doi.org/10.1051/cocv/2021102.

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We derive necessary optimality conditions for the time of crisis problem under a more general hypothesis than the usual one encountered in the hybrid setting, which requires that any optimal solution should cross the boundary of the constraint set transversely. Doing so, we apply the Pontryagin Maximum Principle to a sequence of regular optimal control problems whose integral cost approximates the time of crisis. Optimality conditions are derived by passing to the limit in the Hamiltonian system (without the use of the hybrid maximum principle). This convergence result essentially relies on th
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14

Goncharenko, Andriy Viktorovich. "Aeronautical and Aerospace Material and Structural Damages to Failures: Theoretical Concepts." International Journal of Aerospace Engineering 2018 (2018): 1–7. http://dx.doi.org/10.1155/2018/4126085.

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The goal of this paper is to investigate the possible directions of some specified methods for aeronautical and aerospace material and structure effectiveness modeling and optimization. Multioptionality hybrid function uncertainty conditional optimization doctrine application is supposed to be implemented for a degrading failure problem optimal solution determination. The optimal solution is assumed to deliver the maximum value to the probability of damage but not the failure state of the studied material behavior. The principal supposition is that there should be some certain objectively exis
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Немировский, Юрий Владимирович. "Maximum permissible inelastic deformations of hybrid rectangular plates during intense explosions." Вестник Чувашского государственного педагогического университета им. И.Я. Яковлева. Серия: Механика предельного состояния, no. 1(47) (June 30, 2021): 122–30. http://dx.doi.org/10.37972/chgpu.2021.1.47.012.

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Для гибридных прямоугольных слоистых пластин из произвольных наборов изотропных конструкционных материалов с симметричной структурой расположения слоев относительно отчетной (нейтральной) поверхности получены аналитические формулы оценок допустимой остаточной повреждаемости при воздействии интенсивных нагрузок взрывного типа. Закрепления контура предусматривают любую комбинацию из жестких или шарнирных условий отдельных сторон прямоугольного контура. В основе рассмотренной модели использованы традиционные кинематические гипотезы Кирхгофа, деформационная теория А.А. Ильюшина, принцип слабейшего
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Zhang, Ming, and Jiang Hua Sui. "Hybrid Evolution Strategies Algorithm Based on Dynamic Demes." Advanced Materials Research 424-425 (January 2012): 174–78. http://dx.doi.org/10.4028/www.scientific.net/amr.424-425.174.

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A hybrid evolution strategies algorithm based on dynamic demes is proposed in this paper. Evolutionary strategy algorithm is likely premature, and even simulated annealing with the character of local search is impossible to escape this range, when change the population based on the maximum entropy principle so that the individual out of this range, which can quickly converge to the global optimum. The numerical computation results indicate that the algorithm can gain higher global convergence rate and higher speed
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Liu, Xin, Xinyu Wang, Jun Xie, and Baotong Li. "Construction of probability box model based on maximum entropy principle and corresponding hybrid reliability analysis approach." Structural and Multidisciplinary Optimization 61, no. 2 (2019): 599–617. http://dx.doi.org/10.1007/s00158-019-02382-9.

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Liu, Li Qun, and Chun Xia Liu. "Improved Output Characteristic of Distributed Hybrid Solar–Wind Generating Materials by Using Fuzzy and Immune MPPT Control Method." Advanced Materials Research 321 (August 2011): 76–79. http://dx.doi.org/10.4028/www.scientific.net/amr.321.76.

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The price of photovoltaic (PV) materials and wind generating system (WGS) materials is costly, and the stand-alone PV or WGS can not steadily supplied electric power for end user, fortunately, solar power and wind power can compensate well for one another under various locations and climatic conditions, an efficient maximum power point tracking (MPPT) method for hybrid solar-wind electricity materials is important to extract maximum power from wind and solar energy because of the costly price of PV and WGS. The fuzzy MPPT method is used to track the maximum power point (MPP) of distributed sma
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19

Guo, Yun Bo, and Xin Ren. "The Applied Research of the Super Capacitor in the Maximum Power Tracking of Photovoltaic Systems." Applied Mechanics and Materials 423-426 (September 2013): 2112–15. http://dx.doi.org/10.4028/www.scientific.net/amm.423-426.2112.

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Through analyzing the working principle of the technology of maximum power point tracking in the photovoltaic system, the maximum power tracking circuit is designed. In the hybrid energy storage devices of the super capacitor and battery, the super capacitor is a secondary storage device. Through photovoltaic controller is connected with the photovoltaic cells, photovoltaic cells can achieve the status of the maximum power point tracking. Through the bi-directional DC-DC converting circuit connecting with the battery, the battery can effectively decrease the times of the charging and dischargi
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20

Zeng, Run Zhang, and Huang Qiu Zhu. "Parameter Design and Analysis on Axial Hybrid Magnetic Bearing Using in Magnetic Suspension Flywheel." Applied Mechanics and Materials 529 (June 2014): 125–29. http://dx.doi.org/10.4028/www.scientific.net/amm.529.125.

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Magnetic suspension flywheel system is the actuator of spacecraft in high accurate position control, which requires the employed magnetic bearing possessing advantages of compact structure, small volume, light weight, low power loss, high efficiency and so on. A novel axial hybrid magnetic bearing in magnetic suspension flywheel is proposed, and the bias magnetic flux is provided with a permanent magnet ring. The cost and total volume of this structure can be reduced, which is especially suitable for magnetic suspension flywheel system. The structure and working principle of the axial magnetic
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21

Wang, Zhong Min, and Yi Dai. "Optimization of Maximum Entropy Model of Bayesian Prior Distribution Based on HPSO." Applied Mechanics and Materials 34-35 (October 2010): 502–6. http://dx.doi.org/10.4028/www.scientific.net/amm.34-35.502.

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A hybrid particle swarm optimization (HPSO) approach is proposed to solve the optimization problem of the maximum entropy model oriented to Bayesian prior distribution. HPSO introduces chaos mechanism to create better initial species population, and the power-function carrier is adopted to improve the ergodicity and the sufficiency of the chaos mechanism. Then HPSO uses an inertia weight, which can balance global and local searching capability and fasten convergence speed. A nonlinear constrained optimization model of prior distribution based on the principle of maximum entropy is set up. By u
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22

Tiwari, Shweta, Yogendra Singh, P. K. Upadhyay, and G. K. Koutu. "Principal component analysis and genetic divergence studies for yield and quality-related attributes of rice restorer lines." Indian Journal of Genetics and Plant Breeding (The) 82, no. 01 (2022): 94–98. http://dx.doi.org/10.31742/ijgpb.82.1.13.

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A study on genetic diversity and principal component analysis (PCA) in a set of 90 fertility restorer lines of rice was conducted to identify potential parents for producing high-yielding hybrids. The D2 statistics uncovered the maximum inter-cluster distance between the clusters having different genotypes. The genotypes PS 2, PRR 828, JR-4322-2, and JR-4322-2 belonging to these diversified gene pools may produce heterotic hybrid combinations involving the most suitable parents mentioned above. The PCA reduces dimensional complexity into nine principle axes with PC1 account maximum variable ge
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23

Zhixun, Liang, Shi Yunying, Yi Yunfei, Fan Yuanyuan, and Bi Lvqing. "Electro-Optic Hybrid Logic Gate Derived from a Silicon-Based Hybrid Surface Plasmon Polariton Waveguide." Journal of Nanoelectronics and Optoelectronics 17, no. 2 (2022): 298–304. http://dx.doi.org/10.1166/jno.2022.3197.

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Electro-optic hybrid computing is a key research topic in high-performance computing. AND, OR and NON are the most basic computing units. Logic units, which are composed of a Mach Zehnder interferometer (MZI) and a micro ring resonator (MRR), have the issues of large size and poor thermal stability. To solve these problems, this paper discusses the design of AND, OR and NON basic logic units in compact electro-optic logics based on the principle of silicon-based hybrid surface plasmon polariton waveguides. By optimizing the parameters with the Finite Difference-Time Domain (FDTD), the simulati
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24

Rao, Lavety Navinkumar, Rahul Somalwar, Harshit Dalvi, Satyavir Singh, and Partha Sarathi Subudhi. "Photovoltaic system for maximum power point tracking using hybrid firefly and perturbation and observation algorithm." International Journal of Power Electronics and Drive Systems (IJPEDS) 14, no. 2 (2023): 1121. http://dx.doi.org/10.11591/ijpeds.v14.i2.pp1121-1130.

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This work presents the novel maximum power point tracking (MPPT) approach for a small 50 W photovoltaic (PV) system using the dc-dc converter. The method of modeling of PV module is discussed. The firefly (FFY) algorithm and the perturbation and observation (P&O) algorithm are combined to implement MPPT of the PV system connected to battery load. The operating principle is discussed in detail and steady-state analysis of the proposed system is implemented through simulation. The charging profile of the 7.5 Ah VRL battery is also studied using simulation. Furthermore, a low-cost microco
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Dai, Yi, Zhong Min Wang, and Guang Ling. "Optimization of Maximum Entropy Model Oriented to Bayes Prior Distribution Based on PSO." Applied Mechanics and Materials 37-38 (November 2010): 814–18. http://dx.doi.org/10.4028/www.scientific.net/amm.37-38.814.

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How to acquire prior distribution is a key to Bayes method. Firstly, a nonlinear constrained optimal model of probability density function based on the principle of maximum entropy is set up. By using Lagrange multiplier this constrained optimal problem is transformed to a non-constrained optimal one, which is solved by standard particle swarm optimization (PSO) algorithm. Secondly, a new improved particle swarm optimization (IPSO) algorithm is proposed because standard PSO is slow on convergence and easy to be trapped in local optimum. IPSO introduces the hybrid method from genetic algorithm
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Qurban, Maria, Xiang Zhang, Hafiza Mamona Nazir, et al. "Development of Hybrid Methods for Prediction of Principal Mineral Resources." Mathematical Problems in Engineering 2021 (August 7, 2021): 1–17. http://dx.doi.org/10.1155/2021/6362660.

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Accurate estimation of the mining process is vital for the optimal allocation of mineral resources. The development of any country is precisely connected with the management of mineral resources. Therefore, the forecasting of mineral resources contributed much to management, planning, and a maximum allocation of mineral resources. However, it is challenging because of its multiscale variability, nonlinearity, nonstationarity, and high irregularity. In this paper, we proposed two revised hybrid methods to address these issues to predict mineral resources. Our methods are based on denoising, dec
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Guo, Yazi, Yuchuan Zhu, Yuyang Li, et al. "Model and experimental research of a hybrid self-contained electro-hydrostatic actuator using piezoelectric stack." Journal of Intelligent Material Systems and Structures 29, no. 7 (2017): 1348–59. http://dx.doi.org/10.1177/1045389x17733329.

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Smart material–based electro-hydrostatic actuators are a potential alternative to traditional hydraulic actuators. Piezoelectric materials are a type of smart materials that can deliver large blocked forces. In this article, a piezoelectric stack–based electro-hydrostatic actuator is first introduced by presenting the schematic diagrams of its structure and work principle. Next, according to the research of the piezoelectric stack–based electro-hydrostatic actuator working principle, a mathematical model that can describe the dynamic characteristics of piezoelectric stack–based electro-hydrost
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28

KAR, T. K., U. K. PAHARI, and K. S. CHAUDHURI. "MANAGEMENT OF A PREY-PREDATOR FISHERY BASED ON CONTINUOUS FISHING EFFORT." Journal of Biological Systems 12, no. 03 (2004): 301–13. http://dx.doi.org/10.1142/s0218339004001166.

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This paper deals with the problem of selective harvesting in a hybrid type of prey-predator model. Here we have taken the fishing effort as a dynamic variable and tax as a control instrument. The existence of the possible steady states along with their local stability is discussed. The optimal tax policy is also discussed with the help of Pontryagin's maximum principle. Finally, two numerical examples are taken to illustrate some of the key results.
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Diao, Weidong, Qiaosheng Pan, Yinghao Li, Junjian Zhang, and Zhihua Feng. "Development of a resonant piezohydraulic hybrid actuator." Review of Scientific Instruments 93, no. 7 (2022): 075002. http://dx.doi.org/10.1063/5.0097776.

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This paper proposes a piezohydraulic hybrid actuator driven by a resonant vibrator based on two rhombic micro-displacement amplifiers. The resonant piezohydraulic hybrid actuator consists of a resonant piezoelectric vibrator, a pump body, a manifold, a return valve, and an output cylinder. The vibration mode of the piezoelectric vibrator is simulated, and the working principle of the resonant piezohydraulic hybrid actuator is depicted. Then, the performance of the piezohydraulic hybrid actuator is experimentally investigated, and the effects of exciting frequency, exciting voltage, and bias pr
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Brajčić Kurbaša, Nives, Blaž Gotovac, Vedrana Kozulić, and Hrvoje Gotovac. "Numerical Algorithms for Estimating Probability Density Function Based on the Maximum Entropy Principle and Fup Basis Functions." Entropy 23, no. 12 (2021): 1559. http://dx.doi.org/10.3390/e23121559.

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Estimation of the probability density function from the statistical power moments presents a challenging nonlinear numerical problem posed by unbalanced nonlinearities, numerical instability and a lack of convergence, especially for larger numbers of moments. Despite many numerical improvements over the past two decades, the classical moment problem of maximum entropy (MaxEnt) is still a very demanding numerical and statistical task. Among others, it was presented how Fup basis functions with compact support can significantly improve the convergence properties of the mentioned nonlinear algori
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Li, Zheng, Zhirong Su, Haibo Wang, Shenhui Du, and Hexu Sun. "Design and Locomotion Study of Two-DOF Actuator Driven by Piezoelectric–Electromagnetic Hybrid Mode." Sensors 22, no. 10 (2022): 3739. http://dx.doi.org/10.3390/s22103739.

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A piezoelectric actuator (PEA) has the characteristics of high control precision and no electromagnetic interference. To improve the degree of freedom (DOF) to adapt to more working scenes, a piezoelectric–electromagnetic hybrid-driven two-DOF actuator is proposed. The PEA adopts the composite structure of the lever amplification mechanism and triangular amplification mechanism. The structure effectively amplifies the output displacement of the piezoelectric stack and increases the clamping force between the driving foot and the mover. The electromagnetic actuator (EMA) adopts a multi-stage fr
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32

Chang, T.-H., S.-L. Chen, C.-A. Kang, and I. Inasaki. "Design optimization of the linkage dimension for a hybrid-type parallel kinematic machine tool." Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics 216, no. 2 (2002): 143–56. http://dx.doi.org/10.1243/14644190260070385.

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The parallel kinematic machine tool has many advantages including excellent loading capacity, high structural stiffness and small accumulated error of linkage. It has become one of the most important research fields for machine tools. In the present research, a principle for the optimization of the dimensional design parameters of a parallel kinematic machine tool is proposed. A five-degree-of-freedom (5DOF) parallel kinematic machine tool with a TRR-XY hybrid mechanism is chosen for investigating the design procedures and the optimization results. The inverse kinematics of the hybrid mechanis
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Ren, Fei. "Optimization for Far-distance Cooperative Rendezvous with Multiple Direction-fixed Thrusts." Journal of Physics: Conference Series 2068, no. 1 (2021): 012021. http://dx.doi.org/10.1088/1742-6596/2068/1/012021.

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Abstract The continuous-thrust far-distance cooperative rendezvous problem between two spacecraft is investigated. The indirect optimization method, based on Pontryagin’s maximum principle (PMP), is applied to optimize fuel consumption. To overcome the difficulty in nonsmooth integration caused by the bang-bang control, the homotopy method is adopted to solve the fuel-optimal problem from a related energy-optimal problem. The quantum-behaved particle swarm optimization (QPSO) algorithm is used to obtain the energy-optimal solutions. The energy-optimal solutions are used as the initial values f
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Hasan, Ejaz-Ul, Ahmad Khan, Sajida Habib, Hafeez Sadaqat, and Shahzad Basra. "Genetic diversity of sunflower genotypes under drought stress by principle component analysis." Genetika 52, no. 1 (2020): 29–41. http://dx.doi.org/10.2298/gensr2001029h.

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Seventy diverse genotypes were evaluated for drought stress for morphological (shoot and root length, fresh and dry shoot weight, fresh and dry root weight) and physiological traits (stomatal conductance, photosynthesis and transpiration rate) to increase the area under arid and semi-arid climatic condition to overcome the deficiency of edible oil. All genotypes varied significantly for all evaluated traits. High variability for photosynthesis rate and lower for transpiration rate but highly significant. Genotypic variance and its coefficient are almost higher for all characters then environme
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Modi, V. V., H. Sanchavat, A. D. Deshpande, N. N. Desai, J. C. Rajput, and V. Parmar. "Solar Hybrid System: Innovations in Cooking, Drying, and Power Generation." Journal of Scientific Research and Reports 30, no. 3 (2024): 122–28. http://dx.doi.org/10.9734/jsrr/2024/v30i31863.

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A hybrid system has been designed and developed which comprises the principle of solar thermal and photovoltaic. Flat plate collector and concentrating trough collector were incorporated under solar thermal technology. Solar thermal device which makes the most using infrared radiation out of solar spectrum. Black copper sheet at focal point of the solar trough served as a stand for cooking pan was able to gain direct as well as high intensity reflected solar radiation to expedite the cooking process. The electric unit of the system worked on the principle of photovoltaic effect. Main component
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Liu, Yuhang, Xiangxin Liu, Jianwei Zhang, Yufeng Zhang, and Ziyao Zhu. "A Novel Maximum Power Point Tracking Control Strategy for the Building Integrated Photovoltaic System." Energies 13, no. 11 (2020): 2679. http://dx.doi.org/10.3390/en13112679.

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Thin-film photovoltaic technology has begun to be applied in building-integrated photovoltaics (BIPVs), and it is believed that thin-film photovoltaic technology has potential in building-integrated photovoltaic applications. In this paper, a hybrid approach was investigated which combined the maximum power point tracking (MPPT) algorithm of three-stage variable step size with continuous conduction mode (CCM)/discontinuous current mode (DCM). The research contents of this paper include the principle analysis of the maximum power point tracking algorithm, the design of the sampling period, and
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Soomro, Hassan Ali, Erwan Sulaiman, and Mohd Fairoz Omar. "Performance Comparison and Analysis of (HEFSM) and (FEFSM) Using Segmental Rotor Structure." Applied Mechanics and Materials 695 (November 2014): 778–82. http://dx.doi.org/10.4028/www.scientific.net/amm.695.778.

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This paper presents a new structure of hybrid excitation flux switching motor (HEFSM) using segmental rotor and the comparison of HEFSM and FEFSM using segmental rotor is performed to find the best candidate for hybrid electric vehicles (HEV). (HEFSM) using segmental rotor contains both the FEC and PM on the stator to produce maximum flux linkages. Initially, the coil arrangement tests are examined to validate the operating principle of the (HEFSM) using segmental rotor. Moreover the profile of flux linkage, cogging torque, and torque characteristics at various armature current densities of bo
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Trifiananto, Muhammad, Irvan Septianto Putra, and Mochamad Edoward Ramadhan. "ANALISIS PERFORMA TURBIN ANGIN VAWT (VERTICAL AXIS WIND TURBINE) TIPE HYBRID SAVONIUS DARRIEUS NACA 4712." ROTOR 15, no. 1 (2022): 1. http://dx.doi.org/10.19184/rotor.v15i1.29099.

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A wind turbine is a device that converts wind energy into mechanical energy to produce electric power. Wind turbines have a simple working principle, which is to convert wind energy into mechanical energy in the windmill, then the rotation of the turbine0makes the rotor on the generator rotate and generate electricity. There are 2 types of wind turbines: vertical axis wind turbine and horizontal axis wind turbine. This study aims to determine the performance of the medium-scale VAWT hybrid savonius darrieus NACA 4712 wind turbine. The hybrid wind turbine is a combination of savonius and darrie
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Li, Suyi, Shanqing Jiang, Shan Jiang, Jiang Wu, Wenji Xiong, and Shu Diao. "A Hybrid Wavelet-Based Method for the Peak Detection of Photoplethysmography Signals." Computational and Mathematical Methods in Medicine 2017 (2017): 1–8. http://dx.doi.org/10.1155/2017/9468503.

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The noninvasive peripheral oxygen saturation (SpO2) and the pulse rate can be extracted from photoplethysmography (PPG) signals. However, the accuracy of the extraction is directly affected by the quality of the signal obtained and the peak of the signal identified; therefore, a hybrid wavelet-based method is proposed in this study. Firstly, we suppressed the partial motion artifacts and corrected the baseline drift by using a wavelet method based on the principle of wavelet multiresolution. And then, we designed a quadratic spline wavelet modulus maximum algorithm to identify the PPG peaks au
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Wang, Haixing, Guiping Xiao, and Zhen Wei. "Optimizing Route for Hazardous Materials Logistics Based on Hybrid Ant Colony Algorithm." Discrete Dynamics in Nature and Society 2013 (2013): 1–6. http://dx.doi.org/10.1155/2013/752830.

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Optimizing Route for Hazardous Materials Logistics (ORHML) belongs to a class of problems referred to as NP-Hard, and a strict constraint of it makes it harder to solve. In order to dealing with ORHML, an improved hybrid ant colony algorithm (HACA) was devised. To achieve the purpose of balancing risk and cost for route based on the principle of ACA that used to solve TSP, the improved HACA was designed. Considering the capacity of road network and the maximum expected risk limits, a route optimization model to minimize the total cost is established based on network flow theory. Improvement on
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Anwar, Farah Syamim, Babua Das, Shahrul Azman Zainal Abidin, and Rafyhadi Junaedi. "TIME-SERIES MODEL: HYBRID FIRST-PRINCIPLE WITH OPERATIONAL DATA FOR OPTIMISATION OF AN INDUSTRIAL ENDOTHERMIC REACTOR SYSTEM." Platform : A Journal of Science and Technology 4, no. 1 (2021): 45. http://dx.doi.org/10.61762/pjstvol4iss1art13542.

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It is crucial to identify and manage main pain point contributor(s) in the hydrocarbon value chain in maximising revenue and cash generation. Recently, PETRONAS has embarked on the initiative to maximise the production of propane value chain by addressing the run length limitation issue due to increasing coking rate in one endothermic reactor system. Hybrid of the first principle and plant operational data were used and modelled in a time-series manner. Several high impact influential variables were selected and incorporated into the model, i.e. hydrocarbon throughput, hydrogen-to-hydrocarbon
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Perfilova, O. V., Z. Yu Rodina, K. V. Bryksina, and A. S. Ilyinsky. "Research of the antioxidants content in plant raw materials – ingredients for polycomponent functional chips." New Technologies 19, no. 4 (2024): 134–43. http://dx.doi.org/10.47370/2072-0920-2023-19-4-134-143.

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The article discusses the possibility of using such plant raw materials as pumpkin varieties of Michurinskaya, Krasnaya Malyshka and hybrid Azhur medoviy F1, calendula flower powder, corn flour when designing new types of multicomponent chips ensuring the principle of resource saving due to the involvement of apple production pomace in the technological process juice. A comprehensive analysis of plant raw materials used in the production of chips was carried out for the total content of antioxidants, polyphenolic composition (flavonols, catechins, anthocyanins), the presence of ascorbic acid a
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VOHRALÍK, MARTIN, and BARBARA I. WOHLMUTH. "MIXED FINITE ELEMENT METHODS: IMPLEMENTATION WITH ONE UNKNOWN PER ELEMENT, LOCAL FLUX EXPRESSIONS, POSITIVITY, POLYGONAL MESHES, AND RELATIONS TO OTHER METHODS." Mathematical Models and Methods in Applied Sciences 23, no. 05 (2013): 803–38. http://dx.doi.org/10.1142/s0218202512500613.

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In this paper, we study the mixed finite element method for linear diffusion problems. We focus on the lowest-order Raviart–Thomas case. For simplicial meshes, we propose several new approaches to reduce the original indefinite saddle point systems for the flux and potential unknowns to (positive definite) systems for one potential unknown per element. Our construction principle is closely related to that of the so-called multi-point flux-approximation method and leads to local flux expressions. We present a set of numerical examples illustrating the influence of the elimination process on the
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Leng, Jingwen, Long Jin, Zhike Xu, and Xingxing Zhu. "Development of a 3-DOF Cylindrical Ultrasonic Motor Based on Non-Standard Modes." Applied Sciences 13, no. 18 (2023): 10096. http://dx.doi.org/10.3390/app131810096.

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Cylindrical multi-degree-of-freedom (multi-DOF) ultrasonic motors have the potential to significantly reduce motor size compared to other ultrasonic motors. They find applications in various systems, including micro-robot joints and space probes. This paper proposes a 3-DOF cylindrical ultrasonic motor with hybrid vibration modes. Hybrid vibration modes encompass non-standard longitudinal and bending vibrations. The structure and operating principle of the motor are described first. COMSOL Multiphysics models the stator’s vibration modes, frequency response, and 3-DOF motion. A motor prototype
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Jeoung, Haeseong, Kiwook Lee, and Namwook Kim. "Methodology for Finding Maximum Performance and Improvement Possibility of Rule-Based Control for Parallel Type-2 Hybrid Electric Vehicles." Energies 12, no. 10 (2019): 1924. http://dx.doi.org/10.3390/en12101924.

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Hybrid electric vehicles (HEVs) require supervisory controllers to distribute the propulsion power from sources like an engine and motors. Control concepts based on optimal control theories such as dynamic programming (DP) and Pontryagin’s minimum principle (PMP) have been studied to maximize fuel efficiencies. These concepts are, however, not practical for real-world applications because they guarantee optimality only if future driving information is given prior to the actual driving. Instead, heuristic rule-based control concepts are widely used in real-world applications. Those concepts are
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Taleb, Maamar, Mohamed Amine Fnaiech, and Khaled Zehar. "An Enhanced Hybrid Grid Connected Photovoltaic System Using Voltage Oriented Controller and Class D Chopper." Renewable Energy and Power Quality Journal 21, no. 1 (2023): 69–75. http://dx.doi.org/10.24084/repqj21.225.

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The performance of a shunt interconnection made from a PV system, a three phase grid voltage supply, and a DC shunt motor (DC load) is investigated The PV system participates with maximum powers to the overall interconnection active power flow. It uses a class D chopper circuitry controlled properly by a typical maximum power point tracker (MPPT) controller. The grid has the role of supplying active power in case of any power deficiency needed by the DC motor load. Similarly, it has also the role of absorbing active power in case of any additional power generated by the PV system and not neede
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Zhu, C. Y., A. Shukla, and M. H. Sadd. "Prediction of Dynamic Contact Loads in Granular Assemblies." Journal of Applied Mechanics 58, no. 2 (1991): 341–46. http://dx.doi.org/10.1115/1.2897191.

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An experimental-numerical hybrid technique has been developed to predict the intergranular contact load transfer in granular media subjected to explosive loading. The granular media were simulated by assemblies of circular disks in contact. The peak contact load transfer coefficients (i. e., the ratio of the maximum output contact load to the input contact load as a function of the contact angles) of a given particle were obtained through controlled experimental studies. These coefficients, along with the principle of superposition, were then used to predict the peak contact loads in several r
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HARGILAS, A.K. SINGH, S.L. JAT, P.K. ROKADIA, and ARVID KUMAR. "Response of maize (Zea mays) hybrids to nutrient management practices for enhancing productivity and profitability under sub-humid condition of Southern Rajasthan." Indian Journal of Agronomy 62, no. 3 (2001): 326–31. http://dx.doi.org/10.59797/ija.v62i3.4302.

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A field experiment was conducted during 2 consecutive years of 2013 and 2014 to find out the response of nu- trient expert-decision support systems based on the principle of site-specific nutrient management (SSNM) for achieving targeted yield of maize (Zea mays L.). This approach estimated high dose of N and K and low dose of P over recommended dose of fertilizer (RDF) to evaluate the response of hybrid under this experiment. Growth pa- rameters, yield, nutrient uptake, harvest index and partial factor productivity of P and K and apparent recovery of N and P and economics were significantly h
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Yuyukin, I. V. "The problem of implementing the concept of maximum integration of heterogeneous data in practical navigation." Vestnik Gosudarstvennogo universiteta morskogo i rechnogo flota imeni admirala S. O. Makarova 15, no. 6 (2024): 998–1014. http://dx.doi.org/10.21821/2309-5180-2023-15-6-998-1014.

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The topic of the work is the research of the problem of the practical realization of opportunistic navigation, which actually consists in the fact that the “signals of opportunity” are not optimized for global navigation according to their original purpose. A hypothesis about the possibility of strategic application of the navigation concept based on the principles of data integration with the objective existence of tactically surmountable difficulties is put forward. In the conditions of vulnerability of the global satellite system, an approach to use an additional source of combined signals
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Zhu, Fu-guang, Dong-sheng Xu, Rui-shan Tan, Bin Peng, He Huang, and Zhuo-wen Liu. "Development of Optic-Electric Hybrid Sensors for the Real-Time Intelligent Monitoring of Subway Tunnels." Journal of Sensors 2021 (July 12, 2021): 1–10. http://dx.doi.org/10.1155/2021/8871893.

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The settlement and deformation monitoring of subway tunnels had difficult in long-distance and real time measurement. This study proposed an optic-electric hybrid sensor based on infrared laser ranging technology and cable-sensing technology. The working principle, hardware layer, design details, laboratory calibration and field validation were presented and discussed. The optic-electric hybrid sensor implemented the real-time intelligent analysis modulus for the whole system which could analysis the measurement errors and improve the accuracy. The laboratory calibration tests were carried out
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