Precision assembly error analysis of parts based on multi-constraint surface matching by Wenbin Tang, Tong Yan, Jinshan Sun, Yadong Li

“…To solve the model, Spatial Pyramid Matching with chaotic mapping is employed for population initialization, thereby enhancing population diversity. A nonlinear control mechanism is further introduced to dynamically adjust inertia weight, and a simulated annealing mechanism is integrated into the particle swarm optimization algorithm to enhance the efficiency of the surface matching process. …”
Get full text

Particle Swarm Optimization Based Sliding Mode Controller for Performance Improvement of Unified Power Quality Controllers Inverters by Mohammad Amin Heidari, Mehdi Nafar, Taher Niknam

“…In the proposed control scheme, the standard sliding mode controller (SMC) is used as a robust nonlinear controller, with the addition of the particle swarm optimization (PSO) algorithm - to determine the optimal parameters of the SMC controller. …”
Get full text

Ultimate Strength Analysis of Aluminium Honeycomb Sandwich Panels Subjected to Uniaxial Compressive Loads and Lateral Pressure by Mohamed Elsaka, Yordan Garbatov

“…This study focuses on the numerical analysis of honeycomb sandwich panels employing the nonlinear finite element method through the commercial software ANSYS. …”
Get full text

Trajectory Tracking Control of Robot based on Improved Genetic Algorithm by Liu Yiyang, Liu Mingming

“…The motion track of the robot in the process of motion is influenced by small disturbance linear error,the robot system is a multi variable nonlinear control system,and in the traditional genetic algorithm for trajectory tracking control,the steady- state tracking error appearances in the boundary layer. …”
Get full text

Fatigue life estimation in welded joints under multiaxial loadings by Andrea Carpinteri, Andrea Spagnoli, Sabrina Vantadori

“…In more detail, fatigue life of welded joints under multiaxial stress states can be evaluated by considering a nonlinear combination of the shear stress amplitude (acting on the critical plane) and the amplitude and the mean value of the normal stress (acting on the critical plane). …”
Get full text

Analysis of the Influence of Error on Load Sharing Characteristic of Planetary Transmission System by Zhou Lu, Wu Shijing, Li Jing, Wang Xiaosun, Zhu Weilin

“…A nonlinear transverse-torsional coupled dynamics model for planetary gear sets is established with considering time-varying meshing stiffness and gear backlash,and the changes of dynamic load sharing characteristics are analyzed when errors and error phase angles exist on individual or multiple components. …”
Get full text

Assessment of resilient modulus of soil using hybrid extreme gradient boosting models by Xiangfeng Duan

“…In BKA-XGBOOST, XGBOOST captures the many-to-one nonlinear relationship between geotechnical factors and MR, while BKA provides the optimal hyperparameters for XGBOOST. …”
Get full text

Heat Transfer in Boundary Layer Magneto-Micropolar Fluids with Temperature-Dependent Material Properties over a Stretching Sheet by Ephesus O. Fatunmbi, Samuel S. Okoya

“…With the aid of similarity conversion analysis, the formulated equations of the flow and heat transfer have been translated into a system of nonlinear ordinary differential equations. Subsequently, Runge–Kutta–Fehlberg integration scheme in company of shooting techniques employed to obtain numerical solutions to the reduced equations. …”
Get full text

Estimation of Finite Population Mean in Multivariate Stratified Sampling under Cost Function Using Goal Programming by Atta Ullah, Javid Shabbir, Zawar Hussain, Bander Al-Zahrani

“…In this paper, sample allocation problem in multivariate stratified random sampling with proposed cost function is formulated in integer nonlinear multiobjective mathematical programming. …”
Get full text

Fixed Point Results for α-ψ-Contractive Mappings Including Almost Contractions and Applications by Gonca Durmaz, Gülhan Mınak, Ishak Altun

“…Vetro, Fixed point theorems for α-ψ-contractive type mappings, Nonlinear Analysis. Theory, Methods and Applications, 75 (2012), 2154-2165.), the authors introduced the concept of α-admissible maps on metric spaces. …”
Get full text

The Inverse Problem of Identification of Hydrogen Permeability Model by Yury V. Zaika, Natalia I. Rodchenkova, Ekaterina K. Kostikova

“…A numerical method is developed for TDS spectrum simulation, where only integration of a nonlinear system of low order ordinary differential equations is required. …”
Get full text

Complexities in Assessing Structural Health of Civil Infrastructures by Abdullah Al-Hussein, Achintya Haldar

“…An unscented Kalman filter (UKF) concept is developed for highly nonlinear dynamic systems. It is denoted as 3D UKF-UI-WGI. …”
Get full text

Développement d’un modèle statistique de prédiction de la durée de vie du rachis lombaire, dépendant de la contrainte appliquée, de l’âge et de la densité osseuse by Houcine Ayari, Marc Thomas, Sylvie Doré

“…Due to their large dispersion, the results of the fatigue tests published by Brinckmann (1988) have been classified for analysis using the experiment design method. A nonlinear model presenting a coefficient of determination R2 of 94 % has been established. …”
Get full text

Complex Network in Solar Features by Somayeh Taran

“…The complex network of sunspots has also shown that sunspots and sunspot groups are formed through complex nonlinear dynamics.…”
Get full text

Analysis of Various Damping Models in The Simulation of the Seismic Response of Structures in the STARK ES Software by V. N. Simbirkin, Yu. V. Panasenko, V. V. Kurnavin

“…These are the models of nonlinear viscous dampers, in which the reactive force depends non-linearly on the velocity of the rod movement, equivalent (for an energy dissipated) linear-viscous dampers and equivalent (for a maximum force and an energy dissipated) elastic – perfectly plastic elements. …”
Get full text

Application of EMPE and KP-KELM in Fault Diagnosis of Planetary Gearbox by Bo Qin, Heng Yin, Zhuo Wang, Jianqiang Zhang, Zhijun Li, Jianguo Wang

“…According to the nonlinear and non-stationary of the planetary gearbox vibration signal fault characteristics is difficult to extract and the problem of low classification accuracy Gaussian kernel extreme learning machine based on random generation kernel parameters， a method for identifying the state of planetary gearboxes with enhence multi-scale permutation entropy （EMPE） and nuclear-polarized Gaussian kernel extreme learning machine （KELM） is proposed. …”
Get full text

Contact Analysis of Involute Cylindrical Gear with Considering Assembly Error by Yandong Shi, Ruiliang Zhang

“…Under the same assembly error，the uneven contact is improved with the increase of load，the maximum contact stress presents nonlinear increase with the increase of assembly error and load.…”
Get full text

Indoor terminal localization technology using a single access point based on distributed MIMO networks by Ze LI, Jian ZOU, Zeng HUANG, Zengshan TIAN

“…Regarding the terminal localization in distributed MIMO networks, an indoor terminal localization system using a single access point (AP) based on distributed MIMO networks was proposed.Firstly, the AP’s antennas were arranged at different locations in the room, and the compressed sensing algorithm was used to estimate the angle of departure (AoD) and time of flight (ToF) of the receiving path on each antenna of the terminal device.Secondly, AoDs and ToFs of multiple paths were combined to establish a nonlinear localization model, and an improved Levenberg-Marquardt algorithm was used to solve the problem.Then, theoretical analysis has been examined for the factors that influence the localization error, and the criteria for the antenna layout was provided.Finally, electromagnetic simulation software was used to build simulation environment and conducted the simulation for system verification.Moreover, software-defined radio platforms were used to conduct practical tests.Both simulation and experimental results indicate that the performance of the proposed localization system is superior to existing single-AP localization systems based on natural multipath.…”
Get full text

W-Band GaAs pHEMT Power Amplifier MMIC Stabilized Using Network Determinant Function by Seong-Hee Han, Dong-Wook Kim

“…The amplifier’s stability was evaluated using the network determinant function, ensuring robust performance under both linear and nonlinear conditions. Simultaneous matching for gain and output power was achieved with minimal passive elements. …”
Get full text

Research on the Impact of Environmental Regulation on Enterprise Innovation from the Perspective of Official Communication by Lili Feng, Lin Wang, Wenjun Zhou

“…The Super-Slacks-Based Measure (Super-SBM) model and Multiple Nonlinear Regression model are used to analyze 34,074 samples in China’s A-share market during the 2015–2017 period. …”
Get full text