بی مایند
درباره سایت
آخرین مطالب
- Transfiguration of Random Auxeticity of Programmable Metamaterial: A Kirigami
- Modeling Dry Friction in Multibody Mechanical Systems and Its Applications to
- Magneto-Dependent Vibrational Responses of Multi-Directional Functionally Graded
- Mathematical Modeling and Sensitivity Analysis of Enzymatic Biofuel Cells with
- Exploring Forced Spring-Pendulum Dynamics: From Mathematical Analysis to Chaotic
- Steady-State Oscillations of a Satellite with Passive Attitude Control System in
- State Space Approach to Characterize Rayleigh Waves in a Nonlocal Thermoelastic
- On the Operator Sturm-Liouville Problem with Unbounded Operator Coefficients in
- Damping-Based Attitude Control of a Gyrostatic Satellite in Resistive Media
- Sensitivity Analysis for Elastic Hysteresis Damping in the Time Domain and for
امکانات وب
This paper presents a comprehensive investigation into the auxetic behavior of a mechanical metamaterial inspired by a Kiri-gami structure. Through an integrated approach involving finite element analysis (FEA), and Monte Carlo (MC) simulations, the study explores the mechanical response of the metamaterial unit cell and its tessellated configurations. The study confirms the manifestation of a negative Poisson’s ratio (NPR) through detailed deformation and stress analyses under compressive loadi
برچسب: نویسنده: مهندس نقوی تاريخ: شنبه 21 شهريور 1405 ساعت: 16:50
This paper presents a comprehensive analysis of dry friction modeling for conducting reliable computer simulations in the MATLAB and SIMULINK environments. In particular, this investigation highlights practical issues relevant to studying underactuated multibody systems and implementing control strategies suitable for this family of mechanical systems within the SIMSCAPE MULTIBODY framework. Another significant contribution of this study is the development of a novel nonlinear control algorithm
برچسب: نویسنده: مهندس نقوی تاريخ: شنبه 21 شهريور 1405 ساعت: 16:50
The vibrational frequency characteristics of a shallow shell with an integrated magnetostrictive face sheet and a core made of three-phase multi-directional functionally graded materials (FGM) are discussed in the present study. Properties of the materials are varied along axes of the structure gradually in 3D gradation based on a power-law variation and using three constituents. For analyzing this issue, a high-order exponential shear deformation model is employed. The conditions of zero stress
برچسب: نویسنده: مهندس نقوی تاريخ: شنبه 21 شهريور 1405 ساعت: 16:50
The mathematical model in this study advances prior research on enzymatic biofuel cells by applying the Rajendran–Joy method, which enables approximate analytical solutions of nonlinear reaction–diffusion equations incorporating Michaelis–Menten-type enzyme kinetics. Unlike many earlier models that primarily relied on numerical simulation or simplified linear assumptions, this study provides explicit analytical expressions for substrate concentration profiles and current–potential relationships
برچسب: نویسنده: مهندس نقوی تاريخ: شنبه 21 شهريور 1405 ساعت: 16:50
This article examines the vibrational movement of a system with two degrees-of-freedom (2DOF). It is represented by a spring pendulum (SP) coected to an oscillating support in the presence of a moment and exteal harmonic forces. The system's goveing equations are formulated using Lagrange's equations (LE) and solved analytically using the multiple-scales perturbation approach (MSPA) up to the third approximation. A systematic classification of resonance scenarios is provided, and the modul
برچسب: نویسنده: مهندس نقوی تاريخ: شنبه 21 شهريور 1405 ساعت: 16:50
In this paper, an artificial Earth satellite with an electrodynamic attitude control system is considered. Satellite attitude stabilization in the magneto-Lorentz coordinate system is studied. The problem of the analytical construction of the periodic steady-state oscillations of the satellite in the passive control mode is solved. The solution is obtained in the form of a partial sum of trigonometric series. The algorithm for constructing solution is based on the introduction of auxiliary compl
برچسب: نویسنده: مهندس نقوی تاريخ: شنبه 21 شهريور 1405 ساعت: 16:50
The paper deals with the propagation of Rayleigh waves in a nonlocal thermoelastic isotropic layer that is lying over a nonlocal thermoelastic isotropic half-space within the framework of Eringen's nonlocal elasticity in the three-phase-lag model with voids present. A vector matrix differential equation is obtained by using the state space method to the considered equations. The field equations for an isotropic homogeneous nonlocal thermoelastic material with voids are developed by first constr
برچسب: نویسنده: مهندس نقوی تاريخ: شنبه 21 شهريور 1405 ساعت: 16:50
In this study, we carry out the spectral analysis of operators generated by the Sturm-Liouville equation and boundary conditions, where both contain unbounded operator coefficients and a spectral parameter. Such problems model many processes in classical and quantum mechanics as well as in mechanical engineering. In this paper, we provide a complete description of the domains corresponding to the problem operators in the exit space, a characterization of the spectrum, and the asymptotic behavior
برچسب: نویسنده: مهندس نقوی تاريخ: شنبه 21 شهريور 1405 ساعت: 16:50
The orientation of a satellite that contains a passive, inteal mass damper about a stationary point is studied. The satellite is moving in a resistive medium and influenced by gyrostatic torque (GT). The nonlinear goveing equations of motion (EOMs) for such a case are derived. The parameterized feedback control torques are applied to the satellite to achieve rapid stabilization. Using the angular momentum law and the energy integral with the initial conditions of the motion made it easy to a
برچسب: نویسنده: مهندس نقوی تاريخ: شنبه 21 شهريور 1405 ساعت: 16:50
Document Type : Research PaperPublisher’s Note Shahid Chamran University of Ahvaz remains neutral with regard to jurisdictional claims in published maps and institutional affiliations. Asghari,H , Melnikov,A , Farrokhabadi,A , Spitas,C and Merodio,J . (2026). Sensitivity Analysis for Elastic Hysteresis Damping in the Time Domain and for Other Damping Models. Joual of Applied and Computational Mechanics, 12(3), 893-909. doi: 10.22055/jacm.2025.48626.5373 Asghari,H , , Melnikov,A , , Farrokhabad
برچسب: نویسنده: مهندس نقوی تاريخ: شنبه 21 شهريور 1405 ساعت: 16:50
Long-range artillery projectiles can feature a hybrid design that integrates a base bleed unit and a solid rocket motor, offering substantial improvements in ballistic performance. These improvements are accompanied by significant increases in the launch stresses experienced by the projectile body. The paper evaluates the structural integrity of a 155 mm long-range artillery projectile body through a combined approach of analytical calculations and finite element analysis. The projectile body in
برچسب: نویسنده: مهندس نقوی تاريخ: شنبه 21 شهريور 1405 ساعت: 16:50
This paper investigates the aerodynamic performance enhancement of a Straight-Bladed Vertical Axis Wind Turbine (VAWT) through dimple optimization. This study employs Orthogonal Experimental Design (OED), a classical Design of Experiments (DoE) methodology, to systematically analyze dimple parameters. Initially, three key single-dimple parameters (diameter, position, depth) were investigated, followed by an extended Dual-dimple configuration incorporating six parameters (x/c, d1, l1, d2, l2, s).
برچسب: نویسنده: مهندس نقوی تاريخ: شنبه 21 شهريور 1405 ساعت: 16:50
Thermal management of ventilated cavities is one of the most significant challenges in the design of microfluidic heat sinks, electronic cooling systems, and medical diagnostics systems. The objective of this study is to examine the thermal and fluid dynamic response of a ventilated cavity with two heated obstacles under the influence of an exteal electromagnetic field. The ventilated cavity is filled with advanced teary hybrid nanofluids (THNF) that account for the shape, volume and enhance
برچسب: نویسنده: مهندس نقوی تاريخ: شنبه 21 شهريور 1405 ساعت: 16:50
This study presents a comprehensive finite element (FE) analysis of the critical compressive buckling forces in concentric silicon carbide (SiC) and carbon (C) multi-walled nanotubes (MWNTs), focusing on their relevance to high-performance battery electrode applications. The analysis compares double-walled (DWNTs) and triple-walled nanotubes (TWNTs) across variations in wall sequence, length, radius, and chirality (armchair vs. zigzag). Results indicate that zigzag-configured MWNTs exhibit super
برچسب: نویسنده: مهندس نقوی تاريخ: شنبه 21 شهريور 1405 ساعت: 16:50
This study examines the Maxwell nanofluid's movement along an inclined plate, incorporating couple stress and variable viscosity effects via a machine leaing approach. Key iovations include: (1) a hybrid numerical-ML framework using MATLAB's bvp4c and Bayesian Neural Networks (BNN) for uncertainty quantification; (2) the novel integration of Cattaneo-Christov heat flux with Brownian motion and thermophoresis; and (3) rigorous validation through grid tests and ANN correlations (R ≈ 1). Results show the Maxwell parameter increases the friction factor by 5.82%, while thermophoresis parameter reduces the Nusselt number by 9.59% and the Brownian motion parameter enhances mass transfer by 1.74%. The BNN model achieves high accuracy (error < 0.5%), bridging non-Fourier heat transfer with data-driven methods to optimize thermal and microfluidic systems.
برچسب: نویسنده: مهندس نقوی تاريخ: شنبه 21 شهريور 1405 ساعت: 16:50
Understanding the hemodynamics of stenosed arteries is essential for evaluating cardiovascular function and informing clinical interventions. This study investigates pulsatile flow through two-sided collapsible chaels simulating arterial stenosis using a fluid–structure interaction (FSI) framework. A finite volume solver based on the immersed boundary method is employed to capture the coupled dynamics between pulsatile flow and compliant chael walls under physiologically realistic conditions
برچسب: نویسنده: مهندس نقوی تاريخ: شنبه 21 شهريور 1405 ساعت: 16:50
This study addresses a key prerequisite for applying digital image correlation (DIC) to quantify surface deformations on biological skin: selecting paints and surface preparation techniques that produce reliable speckle pattes. The goal was to identify practical, skin-safe methods that combine high contrast and patte stability with accessibility for routine experimental use. Although the aim is human skin testing, porcine skin was used here as a biological analogue. Several coating strategie
برچسب: نویسنده: مهندس نقوی تاريخ: شنبه 21 شهريور 1405 ساعت: 16:50
The influence of initial conditions on the behavior of two-electrode microelectromechanical systems (MEMS) having parallel-plate and comb structures with variable interelectrode gap is studied and analyzed here within a nonlinear approach. It has been revealed that the two-electrode MEMS operation is considerably influenced not only by the initial conditions and the system characteristics, but also the speed of the applied electrical voltage change. It has been established that during slow chang
برچسب: نویسنده: مهندس نقوی تاريخ: شنبه 21 شهريور 1405 ساعت: 16:50
This article demonstrates the possibilities of computer simulation of capillary phenomena using the axisymmetric contact smoothed particle hydrodynamics (CSPH) method. The conservation accuracy of total momentum and total energy is important in modeling of many physical problems, including capillary phenomena, since the non-physical acceleration may lead to incorrect deformation of free surfaces. A modified axisymmetric CSPH method is considered to improve the accuracy of preserving the total mo
برچسب: نویسنده: مهندس نقوی تاريخ: شنبه 21 شهريور 1405 ساعت: 16:50
This study proposes an Adaptive Nonsingular Fast Terminal Sliding Mode Control (Adaptive-NFTSMC) control method for four-wheeled Car-Like Mobile Robots (CLMRs) to enhance trajectory-tracking performance. The controller extends the Nonsingular Fast Terminal Sliding Mode Control (NFTSMC) technique with Lyapunov-based adaptive laws that update control parameters and estimate the upper bound of disturbances. As a result, the system is able to effectively cope with uncertainties and disturbances with
برچسب: نویسنده: مهندس نقوی تاريخ: شنبه 21 شهريور 1405 ساعت: 16:50