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Journal articles on the topic 'Hard nonlinearity'

Author: Grafiati

Published: 4 June 2025

Last updated: 1 August 2025

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1

Sun, Wei, Ying Liu, and Guangyu Du. "Analytical Modeling of Hard-Coating Cantilever Composite Plate considering the Material Nonlinearity of Hard Coating." Mathematical Problems in Engineering 2015 (2015): 1–14. http://dx.doi.org/10.1155/2015/978392.

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Due to the material nonlinearity of hard coating, the coated structure produces the nonlinear dynamical behaviors of variable stiffness and damping, which make the modeling of hard-coating composite structure become a challenging task. In this study, the polynomial was adopted to characterize this material nonlinearity and an analytical modeling method was developed for the hard-coating composite plate. Firstly, to relate the hard-coating material parameters obtained by test and the analytical model, the expression of equivalent strain of composite plate was derived. Then, the analytical model

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2

LIPTON, J. M., and K. P. DABKE. "SOFTENING THE NONLINEARITY IN CHUA'S CIRCUIT." International Journal of Bifurcation and Chaos 06, no. 01 (1996): 179–83. http://dx.doi.org/10.1142/s0218127496001922.

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The effects of both hard and soft nonlinearities are examined in the frequency domain. Softening the hard nonlinearity in Chua's diode has a similar effect to low pass filtering or reducing the level of high frequency noise components.

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3

Aoki, K., and T. Watanabe. "Nonlinearity of Thermal Spacing Control in Hard Disk Drives." IEEE Transactions on Magnetics 45, no. 2 (2009): 816–21. http://dx.doi.org/10.1109/tmag.2008.2010641.

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4

Loskutov, Yuri V. "The schism in postnonclassical rationality." Vestnik of Saint Petersburg University. Philosophy and Conflict Studies 38, no. 1 (2022): 30–41. http://dx.doi.org/10.21638/spbu17.2022.103.

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Ontological, epistemological, socio-practical, and ethical aspects demonstrate the impossibility of the coexistence of the complex idea of human dimensionality with the complex idea of nonlinearity in the “hard core” of postnonclassical research programs. The idea of human dimensionality, which necessarily has a real paradigmatic status in postnonclassical science, seriously limits the worldview ideas of nonlinearity in favor of linear concepts. The claim of the worldview of nonlinearity to paradigmatic status in postnonclassics leads to the loss of compatibility of this idea with the idea of

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Sun, Wei, Xiaozhou Liu, and Jixiang Jiang. "Vibration analysis of hard-coating laminated plate considering strain-dependent characteristic." Journal of Low Frequency Noise, Vibration and Active Control 37, no. 4 (2018): 789–800. http://dx.doi.org/10.1177/1461348418781867.

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An analytical modeling method of hard-coating laminated plate under base excitation was studied considering strain-dependent characteristic of coating material (i.e. a kind of material nonlinear behavior). For convenience, the strain-dependent characteristic of hard-coating material was characterized by polynomial, and the material parameters were divided into two parts: linearity and nonlinearity. Hard coating was regarded as a special layer in the analysis and Lagrange’s equation was used to acquire nonlinear equation of motion of the hard-coating laminated plate. Based on Newton–Raphson met

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Jian Qin Gong, Lin Guo, Ho Seong Lee, and Bin Yao. "Modeling and cancellation of pivot nonlinearity in hard disk drives." IEEE Transactions on Magnetics 38, no. 5 (2002): 3560–65. http://dx.doi.org/10.1109/tmag.2002.802745.

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7

Morozov, Maxim, Dragan Damjanovic, and Nava Setter. "The nonlinearity and subswitching hysteresis in hard and soft PZT." Journal of the European Ceramic Society 25, no. 12 (2005): 2483–86. http://dx.doi.org/10.1016/j.jeurceramsoc.2005.03.086.

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8

Benyassi, Mohamed, Adil Brouri, and Smail Slassi. "Nonlinear systems identification with discontinuous nonlinearity." IAES International Journal of Robotics and Automation (IJRA) 9, no. 1 (2019): 34. http://dx.doi.org/10.11591/ijra.v9i1.pp34-41.

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<span>In this paper, nonparametric nonlinear systems identification is proposed. The considered system nonlinearity is nonparametric and is of hard type. This latter can be discontinuous and noninvertible. The entire nonlinear system is structured by Hammerstein model. Furthermore, the linear dynamic block is of any order and can be nonparametric. The problem identification method is done within two stages. In the first stage, the system nonlinearity is identified using simple input signals. In the first stage, the linear dynamic block parameters are estimated using periodic signals. The

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9

Tianhong Yan and Rongming Lin. "Experimental modeling and compensation of pivot nonlinearity in hard disk drives." IEEE Transactions on Magnetics 39, no. 2 (2003): 1064–69. http://dx.doi.org/10.1109/tmag.2003.808601.

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10

Benyassi, Mohamed, Adil Brouri, and Smail Slassi. "Nonlinear systems identification with discontinuous nonlinearity." IAES International Journal of Robotics and Automation (IJRA) 9, no. 1 (2020): 34–41. https://doi.org/10.11591/ijra.v9i1.pp34-41.

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In this paper, nonparametric nonlinear systems identification is proposed. The considered system nonlinearity is nonparametric and is of hard type. This latter can be discontinuous and noninvertible. The entire nonlinear system is structured by Hammerstein model. Furthermore, the linear dynamic block is of any order and can be nonparametric. The problem identification method is done within two stages. In the first stage, the system nonlinearity is identified using simple input signals. In the first stage, the linear dynamic block parameters are estimated using per

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11

Brouri, A., and S. Slassi. "Identification of Nonlinear Systems Structured by Wiener-Hammerstein Model." International Journal of Electrical and Computer Engineering (IJECE) 6, no. 1 (2016): 167. http://dx.doi.org/10.11591/ijece.v6i1.8694.

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Wiener-Hammerstein systems consist of a series connection including a nonlinear static element sandwiched with two linear subsystems. The problem of identifying Wiener-Hammerstein models is addressed in the presence of hard nonlinearity and two linear subsystems of structure entirely unknown (asymptotically stable). Furthermore, the static nonlinearity is not required to be invertible. Given the system nonparametric nature, the identification problem is presently dealt with by developing a two-stage frequency identification method, involving simple inputs.

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12

Brouri, A., and S. Slassi. "Identification of Nonlinear Systems Structured by Wiener-Hammerstein Model." International Journal of Electrical and Computer Engineering (IJECE) 6, no. 1 (2016): 167. http://dx.doi.org/10.11591/ijece.v6i1.pp167-176.

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Wiener-Hammerstein systems consist of a series connection including a nonlinear static element sandwiched with two linear subsystems. The problem of identifying Wiener-Hammerstein models is addressed in the presence of hard nonlinearity and two linear subsystems of structure entirely unknown (asymptotically stable). Furthermore, the static nonlinearity is not required to be invertible. Given the system nonparametric nature, the identification problem is presently dealt with by developing a two-stage frequency identification method, involving simple inputs.

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13

Benyassi, Mohamed, and Adil Brouri. "Estimation of nonlinear systems parameters." IAES International Journal of Robotics and Automation (IJRA) 9, no. 1 (2020): 26–33. https://doi.org/10.11591/ijra.v9i1.pp26-33.

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In this paper, an identification method is proposed to determine the nonlinear systems parameters. The proposed nonlinear systems can be described by Wiener systems. This structure of models consists of series of linear dynamic element and a nonlinearity block. Both the linear and nonlinear parts are nonparametric. In particular, the linear subsystem of structure entirely unknown. The considered nonlinearity function is of hard type. This latter can have a dead zone or with preload. These nonlinear systems have been confirmed by several practical applications

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14

Seyhan, Emel, and Jonathan P. Stewart. "Semi-Empirical Nonlinear Site Amplification from NGA-West2 Data and Simulations." Earthquake Spectra 30, no. 3 (2014): 1241–56. http://dx.doi.org/10.1193/063013eqs181m.

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We analyze NGA-West2 data and simulations to develop a site amplification model that captures ground motion scaling with V S30 and soil nonlinear effects. We parameterize nonlinearity as the gradient of site amplification with respect to peak acceleration for reference (firm) sites. Both data analyses and simulations indicate nonlinearity for sites with V S30 < 500 m/s and spectral periods T < ∼3 s. Following approximate removal of nonlinear effects from the data, we evaluate V S30-scaling of ground motions, which is most pronounced for T ≥ ∼0.2 s and saturates for hard rock sites. Regio

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15

Li, Yuan, Qi Liang Liu, and Qing Chi Cai. "Unification of Hoek-Brown Criterion on the Basis of United Strength Theory." Applied Mechanics and Materials 501-504 (January 2014): 415–18. http://dx.doi.org/10.4028/www.scientific.net/amm.501-504.415.

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Based on twin failure mechanism of fracture and shear , the bilinear transitional strength decomposition formula reflecting the nonlinear strength of rock material is proposed,.The decomposed brittle shear formula is integrated and finally the unified strength theory formula characterized by nonlinearity of Hoek-Brown criterion is established. It makes the unified strength theory characterized by nonlinearity of empirical strength criterion, rock mass strength reduction, etc. Besides, it contributes to promote the accuracy and applicability of unified strength theory in rock strength and rock

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Benyassi, Mohamed, and A. Brouri. "Estimation of Nonlinear Systems Parameters." IAES International Journal of Robotics and Automation (IJRA) 9, no. 1 (2020): 26. http://dx.doi.org/10.11591/ijra.v9i1.pp26-33.

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In this paper, an identification method is proposed to determine the nonlinear systems parameters. The proposed nonlinear systems can be described by Wiener systems. This structure of models consists of series of linear dynamic element and a nonlinearity block. Both the linear and nonlinear parts are nonparametric. In particular, the linear subsystem of structure entirely unknown. The considered nonlinearity function is of hard type. This latter can have a dead zone or with preload. These nonlinear systems have been confirmed by several practical applications. The suggested approach involves e

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17

MOLINA, MARIO I. "THE MAGNETOINDUCTIVE DIMER." Modern Physics Letters B 27, no. 27 (2013): 1350196. http://dx.doi.org/10.1142/s0217984913501960.

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In this paper, we examine a nonlinear magnetoinductive dimer and compute its linear and nonlinear symmetric, antisymmetric and asymmetric modes in closed-form, in the rotating-wave approximation. A linear stability analysis of these modes reveals that the asymmetric mode is always stable, for any allowed value of the coupling parameter and for both, hard and soft nonlinearity. An exact numerical computation of the dimer dynamics reveals a magnetic energy self-trapping whose threshold increases for increasing dimer coupling, decreases for increasing nonlinearity response and is robust against a

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18

San, Phyo Phyo, Beibei Ren, Shuzhi Sam Ge, Tong Heng Lee, and Jin-Kun Liu. "Adaptive Neural Network Control of Hard Disk Drives With Hysteresis Friction Nonlinearity." IEEE Transactions on Control Systems Technology 19, no. 2 (2011): 351–58. http://dx.doi.org/10.1109/tcst.2010.2041233.

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19

Torvik, Peter J. "Damping Properties of Hard Coatings for Engine Applications." Advances in Science and Technology 66 (October 2010): 126–35. http://dx.doi.org/10.4028/www.scientific.net/ast.66.126.

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Although blade coating materials dissipate vibratory energy while acting as thermal barrier coatings or protecting the substrate against corrosion or erosion, the inherent nonlinearity of these materials complicates the determination of the necessary material parameters. While plasma-sprayed ceramics alone do not appear to provide the desired levels of dissipation, notable increases in damping have been found to result from the inclusion of small amounts of viscoelastic materials. With proper selection of the added component, the resulting coating may be tailored for high damping in a specific

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20

Kosytsyn, Sergey B., and Maxim M. Begichev. "ANALYSIS OF STABILITY OF A TRUSS MODEL WITH HARD NODES BASED ON VARIOUS STRESS-STRAIN CURVES." International Journal for Computational Civil and Structural Engineering 13, no. 4 (2017): 96–102. http://dx.doi.org/10.22337/2587-9618-2017-13-4-96-102.

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The stability of the equilibrium of rod systems is studied numerically taking into account the geometric nonlinearity using as an example a truss with rigid nodes. Various material models are used: linear elastic and elastoplastic with Prandtl and real stress-strain curves. The features of the loss of equilibrium stability are shown

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21

Bochkarev, Andrey, Aleksandr Zemlyanukhin, Vladimir Erofeev, and Aleksandr Ratushny. "Analytically Solvable Models and Physically Realizable Solutions to Some Problems in Nonlinear Wave Dynamics of Cylindrical Shells." Symmetry 13, no. 11 (2021): 2227. http://dx.doi.org/10.3390/sym13112227.

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The axially symmetric propagation of bending waves in a thin Timoshenko-type cylindrical shell, interacting with a nonlinear elastic Winkler medium, is herein studied. With the help of asymptotic integration, two analytically solvable models were obtained that have no physically realizable solitary wave solutions. The possibility for the real existence of exact solutions, in the form of traveling periodic waves of the nonlinear inhomogeneous Klein–Gordon equation, was established. Two cases were identified, which enabled the development of the modulation instability of periodic traveling waves

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22

Shan, Li Jun, Xue Fang, and Wei Dong He. "Nonlinear Dynamic Model and Equations of RV Transmission System." Advanced Materials Research 510 (April 2012): 536–40. http://dx.doi.org/10.4028/www.scientific.net/amr.510.536.

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The nonlinear dynamics model of gearing system is developed based on RV transmission system. The influence of the nonlinear factors as time-varying meshing stiffness, backlash of the gear pairs and errors is considered. By means of the Lagrange equation the multi-degree-of-freedom differential equations of motion are derived. The differential equations are very hard to solve for which are characterized by positive semi-definition, time-variation and backlash-type nonlinearity. And linear and nonlinear restoring force are coexist in the equations. In order to solve easily, the differential equa

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23

Ren, Beibei, Phyo Phyo San, Shuzhi Sam Ge, and Tong Heng Lee. "Robust Adaptive Control of Hard Disk Drives with Hysteresis Friction Nonlinearity in Mobile Applications." IFAC Proceedings Volumes 41, no. 2 (2008): 2538–43. http://dx.doi.org/10.3182/20080706-5-kr-1001.00428.

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24

Mola, Mirhamed, Alireza Khayatian, and Maryam Dehghani. "Identification and Adaptive Position Control of Uncertain Two-Mass Systems with Backlash Hard Nonlinearity." Iranian Journal of Science and Technology, Transactions of Mechanical Engineering 41, no. 3 (2016): 197–207. http://dx.doi.org/10.1007/s40997-016-0052-2.

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25

Ohno, Keitaro, and Roberto Horowitz. "A pivot nonlinearity compensation by use of variable structure estimator for hard disk drives." Microsystem Technologies 11, no. 8-10 (2005): 702–10. http://dx.doi.org/10.1007/s00542-005-0549-x.

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26

Gunning, James, Michael E. Glinsky, and John Hedditch. "Resolution and uncertainty in 1D CSEM inversion: A Bayesian approach and open-source implementation." GEOPHYSICS 75, no. 6 (2010): F151—F171. http://dx.doi.org/10.1190/1.3496902.

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Resolution and uncertainty in controlled-source electromagnetic (CSEM) inversion is most naturally approached using a Bayesian framework. Resolution can be inferred by hierarchical models with free parameters for effective correlation lengths (“Bayesian smoothing”), or model-choice frameworks applied to variable resolution spatial models (Bayesian splitting/merging). Typical 1D CSEM data can be modeled with quite parsimonious models, typically O(10) parameters per common midpoint. Efficient optimizations for the CSEM problem must address the challenges of poor scaling, strong nonlinearity, mul

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27

Lu, Tong Tong, Zheng Liu, Yi Zhang, and Teng Zhan. "Workshop Facility Layout Optimization Based on the Crowding Niche Cellular Genetic Algorithm." Applied Mechanics and Materials 278-280 (January 2013): 2172–76. http://dx.doi.org/10.4028/www.scientific.net/amm.278-280.2172.

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Workshop facility layout belongs to a kind of combinational optimization problem, which has the characteristics of nonlinearity and not being easily solved with conventional methods, therefore it is regarded as a typical NP hard problem. This paper proposed a crowding niche cellular genetic algorithm. By introducing niche crowding technology to select the best individuals, the population diversity was well maintained. On the other hand, neighbors in cellular automata were adopted to study more on the cellular topological optimization structure, which enhanced the global searching ability of th

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28

Song, Xin, Ming Yu Li, Li Li, and Chao Yang. "The Neural Network Control Algorithm Research of Single Crystal Furnace Temperature System." Advanced Materials Research 765-767 (September 2013): 789–92. http://dx.doi.org/10.4028/www.scientific.net/amr.765-767.789.

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Straight pull single crystal furnaces temperature control system has problem of the long time lag and nonlinearity, so the precise mathematic mode that is hard to build. Advanced control strategies show strong advantages for resolving these problems. This paper use artificial neural network modeling approach to establish single crystal furnace temperatures neural network control BP structure model, use adaptive method to control the temperature of the single crystal furnace.

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Morkina, A. Y., Y. V. Bebikhov, Z. G. Rakhmatullina, M. N. Semenova, and S. V. Dmitriev. "Effect of discrete breather ensembles on the heat capacity of nonlinear one-dimensional crystals." Vestnik UGATU 27, no. 4(102) (2023): 50–58. http://dx.doi.org/10.54708/19926502_2023_27410250.

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There are numerous works studying the processes of generation of crystal lattice defects due to the fact that this process is the root cause of a change in a set of properties of a material. An atom’s abandonment of the equilibrium state always takes placeby overcoming potential barriers through a transition from a dynamic defect to a topological one. Examples of dynamic defects are fluctuations and discrete breathers. Experimental and molecular dynamics studies have confirmed that discrete breathers (DBs)can be excited in various crystal lattices, and when interacting with point defects, they

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Man, Chun Tao, Jia Cui, Xin Xin Yang, Jun Kai Wang, and Tian Feng Wang. "Temperature Control of Batch Reaction Based on Genetic Fuzzy Neural Network." Advanced Materials Research 204-210 (February 2011): 1968–71. http://dx.doi.org/10.4028/www.scientific.net/amr.204-210.1968.

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The batch reactor has strong nonlinearity and hysteresis, the conventional control method is hard to meet the control requirements. According to the batch processes temperature control, this thesis proposed an intelligent control scheme. Combined neural networks with fuzzy logic control, searching and optimized parameters of fuzzy neural network by using Genetic Algorithm (GA), displayed the design method and optimization steps, and the simulation results verify the control scheme which proposed is feasible and effective.

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Park, Dae Woo. "Ultrasound Shear Wave Simulation of Breast Tumor Using Nonlinear Tissue Elasticity." Computational and Mathematical Methods in Medicine 2016 (2016): 1–6. http://dx.doi.org/10.1155/2016/2541325.

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Shear wave elasticity imaging (SWEI) can assess the elasticity of tissues, but the shear modulus estimated in SWEI is often less sensitive to a subtle change of the stiffness that produces only small mechanical contrast to the background tissues. Because most soft tissues exhibit mechanical nonlinearity that differs in tissue types, mechanical contrast can be enhanced if the tissues are compressed. In this study, a finite element- (FE-) based simulation was performed for a breast tissue model, which consists of a circular (D: 10 mm, hard) tumor and surrounding tissue (soft). The SWEI was perfo

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32

Liang, Jing, Kai Jing, Yan Dong, Xiaping Lin, and Yuqing Wang. "Nominal-Model-Based Sliding-Mode Control for Traveling-Wave Ultrasonic Motor." Micromachines 13, no. 11 (2022): 1846. http://dx.doi.org/10.3390/mi13111846.

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Traveling-wave ultrasonic motors (TWUSMs) have strong nonlinearity and uncertainty, which are sensitive to the environment, disturbances, and load changes. Thus, precision control of TWUSMs is hard to achieve with traditional methods for complex driving mechanisms. A nominal-model-based sliding-mode control strategy with strong robustness is proposed to achieve accurate speed control of TWUSMs. Firstly, a second-order nominal model of the speed difference and output torque was deduced to construct a nonlinear sliding-mode surface; then, a nonlinear sliding-mode controller was designed with the

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Yu, Yang, Jinfu Fan, Yuanqing Xian, and Zhongjie Wang. "Graph Neural Network for Senior High Student’s Grade Prediction." Applied Sciences 12, no. 8 (2022): 3881. http://dx.doi.org/10.3390/app12083881.

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Senior high school education (SHSE) forms a connecting link between the preceding junior high school education and the following college education. Through SHSE, a student not only completes k-12 education, but also lays a foundation for subsequent higher education. The grade of the student in SHSE plays a critical role in college application and admission. Therefore, utilizing the grade of the student as an indicator is a reasonable method to instruct and ensure the effect of SHSE. However, due to the complexity and nonlinearity of the grade prediction problem, it is hard to predict the grade

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34

Xi, Jian Hui, and Jia Chen. "An Improved Noise Reduction Based on Wavelet Threshold." Key Engineering Materials 474-476 (April 2011): 1701–5. http://dx.doi.org/10.4028/www.scientific.net/kem.474-476.1701.

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Based on multi-resolution analysis of wavelet, this article is aimed at building a new soft threshold function for wavelet de-noising, to overcome the discontinuous disadvantage of the hard threshold function. In the area adjacent to the threshold, continuously adjustable nonlinear functions are introduced in piecewise to process the wavelet coefficients more carefully in this area. Consequently, large deviation caused by super-compression of wavelet coefficients when using traditional soft threshold could be avoided, and the nonlinearity of the system is able to be effectively kept. Using bot

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Shad, Muhammad Rizwan, Guilhem Michon, and Alain Berlioz. "Nonlinear Dynamics of Rotors due to Large Deformations and Shear Effects." Applied Mechanics and Materials 110-116 (October 2011): 3593–99. http://dx.doi.org/10.4028/www.scientific.net/amm.110-116.3593.

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An analysis of linear and nonlinear dynamics of rotors is presented taking into account the shear effects. The nonlinearity arises due to the consideration of large deformations in bending. The rotor system studied is composed of a rigid disk and a circular shaft. In order to study the combined effect of rotary inertia and shear effects the shaft is modeled as a Timoshenko beam of circular cross section. A mathematical model is developed consisting of 4th order coupled nonlinear differential equations of motion. Method of multiple scales is used to solve these nonlinear equations. Linear and n

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Wickert, J. A. "Vibration of Flex Circuits in Hard Disk Drives." Journal of Vibration and Acoustics 125, no. 3 (2003): 335–42. http://dx.doi.org/10.1115/1.1547661.

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A flex circuit connects the stationary electronic components in a hard disk drive to the rotating arm that carries the read/write heads and positions them above data tracks on the disk. Flex circuits are conventionally formed as a laminate of polyimide substrate, adhesive, and copper conductors. Deformation of a flex circuit is discussed in the context of the following stages: the initial unstressed shape, configurations in which stresses set and relax in response to elevated temperature, equilibrium, and small amplitude vibration. The model involves displacements of the flex circuit in the di

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Peng, Kemao, Ben M. Chen, Guoyang Cheng, and Tong H. Lee. "Friction and nonlinearity compensation in hard disk drive servo systems using robust composite nonlinear feedback control." Australian Journal of Electrical and Electronics Engineering 2, no. 1 (2005): 81–90. http://dx.doi.org/10.1080/1448837x.2005.11464117.

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Leonteva, A. V. "PROPAGATION OF LONGITUDINAL WAVES IN A MINDLIN-HERRMANN ROD IMMERSED IN A NONLINEAR ELASTIC MEDIUM." Problems of Strength and Plasticity 87, no. 1 (2025): 70–80. https://doi.org/10.32326/1814-9146-2025-87-1-70-80.

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In this work, the propagation of longitudinal waves in a homogeneous rod immersed in a non-linear elastic medium is studied. The dynamic behavior of the rod is determined by the Mindlin – Herrmann theory, which neglects the hypothesis of the proportionality of transverse deformations to longitudinal deformations under axial tension or compression. To describe the movement of particles in the transverse direction, an additional function is introduced that provides greater model accuracy. The initial system of equations reduces to one nonlinear equation of the fourth order relative to the longit

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Zhang, Fa Jun, Zhong Liu, Chang Zhou, and Yi Lei. "Research on a Control Strategy of Anneal Stove in Continuous Casting Machine with Fuzzy Self-Tuning PID Control." Applied Mechanics and Materials 336-338 (July 2013): 519–22. http://dx.doi.org/10.4028/www.scientific.net/amm.336-338.519.

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In allusion to temperature hard to control for parameters parameter being variable and nonlinearity in the process of annealing furnace. A detailed study of the annealing furnace temperature control by combined with fuzzy and PID in this paper, all dynamic parameters of the annealing furnace temperature have been considered effectively, and by this control system method the temperature of annealing furnace was controled steadily. Through the simulation experiments show that this PID control mode has a characteristics of good dynamic performancestrong adaptability and good robustness in the app

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Sun, Xue Gang, and Zheng Gan Zhou. "GPC Control on Exhaust Gas in Regenerative Furnace Based on Feedforward of Hearth Temperature and Air Flow." Applied Mechanics and Materials 364 (August 2013): 294–98. http://dx.doi.org/10.4028/www.scientific.net/amm.364.294.

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Exhaust temperature is an important indicator in regenerative furnace with characteristics of nonlinearity, time-varying and large inertia. Also, it is affected by the hearth temperature and flow rate of combustion air, which makes it hard to be well controlled by traditional methods, such as PID and etc. In this paper, a strategy of generalized predictive control (GPC) integrated with feedforward of hearth temperature and air flow is presented to optimize the exhaust temperature control. Practices show that the control index is more stable and errors are obviously narrowed.

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Zhou, Yu, and Jiang Jiang. "A Differential Evolution Based Optimization Algorithm for Production Planning Model in Defense Industry." Advanced Materials Research 709 (June 2013): 249–52. http://dx.doi.org/10.4028/www.scientific.net/amr.709.249.

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The production planning problem in defense industry has the non-regular nonlinearity of the objective function and the NP-hard nature of the solution space. A nonlinear integer programming model was proposed for this problem. A differential evolution based optimization algorithm was developed to solve the proposed model. A case study validated the effectiveness of the developed algorithm, and proved that it is superior to the standard genetic algorithm on the global searching capability. The algorithm can support the weapons production planning, and also can be applied to other industries.

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Li, Chunping, Huibing Hao, Fang Xu, and Guotao Zhao. "Reliability Evaluation of Multiple DCFP System subject to Shifting Threshold." Shock and Vibration 2020 (July 14, 2020): 1–11. http://dx.doi.org/10.1155/2020/9206239.

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This paper focuses on system reliability analysis with dependent competing failure process due to soft failure and hard failure. Some new probabilistic methods based on cumulative shock model and nonlinear Wiener process under different shifting thresholds situation are obtained. Considering that nonlinearity exists extensively in practice, the continuous soft failure process is governed by random effected nonlinear Wiener process. Firstly, reliability evaluation models for hard failure and soft failure are obtained under the cumulative shock, respectively. Furthermore, some system reliability

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Semenov, A. S., E. A. Korznikova, and S. V. Dmitriev. "Discrete breathers with hard and soft type of nonlinearity in 1D Morse lattices with long-range interactions." Letters on Materials 5, no. 1 (2015): 11–14. http://dx.doi.org/10.22226/2410-3535-2015-1-11-14.

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Zhang, Yue, Wei Sun, Jian Yang, and Qingkai Han. "Analytical analysis of forced vibration of the hard-coating cylindrical shell with material nonlinearity and elastic constraint." Composite Structures 187 (March 2018): 281–93. http://dx.doi.org/10.1016/j.compstruct.2017.12.045.

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Úředníček, Zdenêk. "Nonlinear systems - describing functions analysis and using." MATEC Web of Conferences 210 (2018): 02021. http://dx.doi.org/10.1051/matecconf/201821002021.

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The paper presents a basic description and examples of the use of so called descriptive functions, allowing analysing the influence of inherent and indispensable components of all mechatronic systems mechanical subsystems - so called hard nonlinearities. These parts “causing” - in addition to the centrifugal and Coriolis generalized forces- the nonlinearity of the system, can be analysed by the abovementioned method from the point of view of their origin and the estimation of the basic parameters of their frequent consequences - so-called limit cycles. After a short introduction, which introdu

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Hao, Huibing, and Chunping Li. "Multi-State Reliability Analysis Based on General Wiener Degradation Process and Random Shock." Shock and Vibration 2022 (October 26, 2022): 1–13. http://dx.doi.org/10.1155/2022/5464643.

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A multi-state reliability analysis model suffering from a dependent competing failure process is developed in this study, where the soft failure is described by general nonlinearity random effect. Wiener degradation process with measurement error and the hard failure is caused by random shock. Considering that the shock process not only may cause abrupt damage but also can accelerate degradation, there are some correlations between soft failure and hard failure. Based on the proposed new model, the multi-state functions are obtained under the cumulative shock model and the extreme shock model,

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Dao, Nguyen Van. "Nonlinear oscillations in systems with large static deflection of elastic elements." Vietnam Journal of Mechanics 15, no. 4 (1993): 7–16. http://dx.doi.org/10.15625/0866-7136/10214.

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In mechanical systems the static deflection of the elastic elements is usual not appeared in the equations of motion. The reason is that either a linear model of the elastic elements or their too small static deflection assumption was accepted. In the present paper both nonlinear model of elastic elements and their large static deflection are considered, so that the nonlinear terms in the equation of motion appear with different degrees of smallness. In this case the nonlinearity of the system depends not only on the nonlinear characteristic of the elastic element but on its static deflection.

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Meng, Hua, Ming Yu Li, Jie Zhu, and Yan Ju Zhang. "The Temperature Control System Research of PVC Latex Batching Based on PLC." Applied Mechanics and Materials 299 (February 2013): 97–101. http://dx.doi.org/10.4028/www.scientific.net/amm.299.97.

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The PVC latex batching system has problem of the long time lag and nonlinearity and the precise mathematic mode that is hard to build. Advanced control strategies show strong advantages for resolving these problems, thus the combination of the advanced control strategies with the popular PLC has been the hot area in controlling-industry. In this paper, it proposed to apply the fuzzy control to the Batching system and has completed the design of the fuzzy controller. Based on the characteristics of the PLC, the realization of fuzzy control on PLC and the design method of the fuzzy controller in

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Yu, Yu Zhen, Xin Yi Ren, Chun Yan Deng, Jing Jing Yu, Shu Zhen Li, and Jun Jie Shi. "Regulation of PID Controller Parameters Based on Ant Colony Optimization Algorithm in Bending Control System." Applied Mechanics and Materials 128-129 (October 2011): 205–10. http://dx.doi.org/10.4028/www.scientific.net/amm.128-129.205.

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The bending-roll control system has characteristics of time-varying, time-delay, nonlinearity and serious external disturbance, so it is hard to establish precise math model that be applied to control. In view of the problems above, ant colony algorithm is used to tuning parameters of PID controller and concrete step of PID parameters tuning based on ant colony algorithm is given. The simulation results indicate that the method not only improves control performance and dynamic quality, but also has strong self-adapting ability and robustness. It achieved a very good control effect when used in

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Tao, Xiong. "Process Control Strategy for Oilfield Piezoelectric Control Layered Production Allocation." Applied Mechanics and Materials 380-384 (August 2013): 403–7. http://dx.doi.org/10.4028/www.scientific.net/amm.380-384.403.

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Focusing on the fluid flow control in oilfield piezoelectric control layered production allocation, an identification-free adaptive control strategy with expert amendment is proposed to solve the problem that it is hard to be controlled due to large time delay, nonlinearity, time variation and difficulty in establishing mathematical model of regulation process. In this control strategy, according to the past and current process information, the process output and trend can be estimated based on expert rules to amend the output of the identification-free adaptive control. The simulation result

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