Seyed M. Hashemi
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View article: MDO of Robotic Landing Gear Systems: A Hybrid Belt-Driven Compliant Mechanism for VTOL Drones Application
MDO of Robotic Landing Gear Systems: A Hybrid Belt-Driven Compliant Mechanism for VTOL Drones Application Open
This paper addresses inherent limitations in unmanned aerial vehicle (UAV) undercarriages hindering vertical takeoff and landing (VTOL) capabilities on uneven slopes and obstacles. Robotic landing gear (RLG) designs have been proposed to a…
View article: "Multiphysics Simulation and Experimental Analysis of Laser-Clad Stellite 6 on 316 Stainless Steel Using Fem and Rsm"
"Multiphysics Simulation and Experimental Analysis of Laser-Clad Stellite 6 on 316 Stainless Steel Using Fem and Rsm" Open
View article: Towards Design Optimization of Compliant Mechanisms: A Hybrid Pseudo-Rigid-Body Model–Finite Element Method Approach and an Accurate Empirical Compliance Equation for Circular Flexure Hinges
Towards Design Optimization of Compliant Mechanisms: A Hybrid Pseudo-Rigid-Body Model–Finite Element Method Approach and an Accurate Empirical Compliance Equation for Circular Flexure Hinges Open
Innovative designs such as morphing wings and terrain adaptive landing systems are examples of biomimicry and innovations inspired by nature, which are actively being investigated by aerospace designers. Morphing wing designs based on Vari…
View article: Ratcheting Simulation of Additively Manufactured Aluminum 4043 Samples through Finite Element Analysis
Ratcheting Simulation of Additively Manufactured Aluminum 4043 Samples through Finite Element Analysis Open
This study presents a finite element-based ratcheting assessment of additively manufactured aluminum 4043 samples undergoing asymmetric loading cycles. The Chaboche material model in ANSYS was utilized and the effects of mesh and element t…
View article: Experimental and Numerical Modal Analysis of a Composite Rocket Structure
Experimental and Numerical Modal Analysis of a Composite Rocket Structure Open
Finite Element Analysis (FEA) is a powerful tool that can aid in the engineering design process to reduce cost and time. However, it is best used in conjunction with experimental data, through which its numerical results can be verified. T…
View article: Ratcheting–Fatigue Damage Assessment of Additively Manufactured SS304L and AlSi10Mg Samples under Asymmetric Stress Cycles
Ratcheting–Fatigue Damage Assessment of Additively Manufactured SS304L and AlSi10Mg Samples under Asymmetric Stress Cycles Open
The present study aims to investigate the interaction of ratcheting and fatigue phenomena for additively manufactured (AM) samples of SS304L and AlSi10Mg undergoing uniaxial asymmetric stress cycles. Overall damage was accumulated through …
View article: Structural Dynamic Characterization of a Modular Morphing Wing Exploiting Finite Elements and Taguchi Methodology
Structural Dynamic Characterization of a Modular Morphing Wing Exploiting Finite Elements and Taguchi Methodology Open
Detrimental environmental impacts due to the increasing demands of the aviation industry have gained tremendous global attention. With a potential fuel saving, along with high aerodynamic performance and maneuverability during different ph…
View article: Functional Hazard Assessment of a Modular Re-Configurable Morphing Wing Using Taguchi and Finite Element Methodologies
Functional Hazard Assessment of a Modular Re-Configurable Morphing Wing Using Taguchi and Finite Element Methodologies Open
Growing concerns over the CO2 footprint due the exponential demand of the aviation industry, along with the requirements for high aerodynamic performance, cost saving, and manoeuvrability during different phases of a flight, pave the path …
View article: Undamped Free Vibration Analysis of Functionally Graded Beams: A Dynamic Finite Element Approach
Undamped Free Vibration Analysis of Functionally Graded Beams: A Dynamic Finite Element Approach Open
A Dynamic Finite Element (DFE) method for coupled axial–flexural undamped free vibration analysis of functionally graded beams is developed and subsequently used to investigate the system’s natural frequencies and mode shapes. The formulat…
View article: Multidisciplinary Design Optimization of a Re-Entry Spacecraft via Radau Pseudospectral Method
Multidisciplinary Design Optimization of a Re-Entry Spacecraft via Radau Pseudospectral Method Open
The design and optimization of re-entry spacecraft or its subsystems is a multidisciplinary or multiobjective optimization problem by nature. Multidisciplinary design optimization (MDO) focuses on using numerical optimization in designing …
View article: Free Vibration Analysis of a Reconfigurable Modular Morphing Wing
Free Vibration Analysis of a Reconfigurable Modular Morphing Wing Open
Aircraft experience various phases during each flight. Optimal performance, without compromise, during various phases can be achieved through adaptability in the wing design. Morphing wing design encompasses most, if not all, the flight co…
View article: On the Free Vibration and the Buckling Analysis of Laminated Composite Beams Subjected to Axial Force and End Moment: A Dynamic Finite Element Analysis
On the Free Vibration and the Buckling Analysis of Laminated Composite Beams Subjected to Axial Force and End Moment: A Dynamic Finite Element Analysis Open
This work presents the bending–torsion coupled free vibration analysis of prestressed, layered composite beams subjected to axial force and end moment using the traditional finite element method (FEM) and dynamic finite element (DFE) techn…
View article: Dynamic Finite Element Modelling and Vibration Analysis of Prestressed Layered Bending–Torsion Coupled Beams
Dynamic Finite Element Modelling and Vibration Analysis of Prestressed Layered Bending–Torsion Coupled Beams Open
Free vibration analysis of prestressed, homogenous, Fiber-Metal Laminated (FML) and composite beams subjected to axial force and end moment is revisited. Finite Element Method (FEM) and frequency-dependent Dynamic Finite Element (DFE) mode…
View article: Two-Zone Simulation of an Axial Vane Rotary Engine Cycle
Two-Zone Simulation of an Axial Vane Rotary Engine Cycle Open
An axial vane rotary engine (AVRE) is a novel type of rotary engines. The engine is a positive displacement mechanism that permits the four “stroke” action to occur in one revolution of the shaft with a minimum number of moving components …
View article: A Finite Element Formulation for Bending‐Torsion Coupled Vibration Analysis of Delaminated Beams under Combined Axial Load and End Moment
A Finite Element Formulation for Bending‐Torsion Coupled Vibration Analysis of Delaminated Beams under Combined Axial Load and End Moment Open
Free vibration analysis of beams with single delamination undergoing bending‐torsion coupling is made, using traditional finite element technique. The Galerkin weighted residual method is applied to convert the coupled differential equatio…
View article: New Frequency‐Dependent Trigonometric Interpolation Functions for the Dynamic Finite Element Analysis of Thin Rectangular Plates
New Frequency‐Dependent Trigonometric Interpolation Functions for the Dynamic Finite Element Analysis of Thin Rectangular Plates Open
The Dynamic Finite Element (DFE) formulation is a superconvergent, semianalytical method used to perform vibration analysis of structural components during the early stages of design. It was presented as an alternative to analytical and nu…
View article: Vibration‐Based, Nondestructive Methodology for Detecting Multiple Cracks in Bending‐Torsion Coupled Laminated Composite Beams
Vibration‐Based, Nondestructive Methodology for Detecting Multiple Cracks in Bending‐Torsion Coupled Laminated Composite Beams Open
Damage to composite structures occurs from impact, fatigue, or over stress and can be critical in the safe operation of wings or any structural member. This paper presents a method for detection of multiple cracks present in laminated comp…
View article: A Dynamic Coefficient Matrix Method for the Free Vibration of Thin Rectangular Isotropic Plates
A Dynamic Coefficient Matrix Method for the Free Vibration of Thin Rectangular Isotropic Plates Open
The free flexural vibration of thin rectangular plates is revisited. A new, quasi‐exact solution to the governing differential equation is formed by following a unique method of decomposing the governing equation into two beam‐like express…
View article: A Framework for Extension of Dynamic Finite Element Formulation to Flexural Vibration Analysis of Thin Plates
A Framework for Extension of Dynamic Finite Element Formulation to Flexural Vibration Analysis of Thin Plates Open
Dynamic Finite Element formulation is a powerful technique that combines the accuracy of the exact analysis with wide applicability of the finite element method. The infinite dimensionality of the exact solution space of plate equation has…
View article: On Finite Element Vibration Analysis of Carbon Nanotubes
On Finite Element Vibration Analysis of Carbon Nanotubes Open
In this chapter, a finite element formulation is proposed to study the natural frequencies of double-walled carbon nanotubes modeled as, both, local and nonlocal Euler-Bernoulli beams, coupled with van der Waals interaction forces. The for…
View article: Cold compaction behavior and pressureless sinterability of ball milled WC and WC/Cu powders
Cold compaction behavior and pressureless sinterability of ball milled WC and WC/Cu powders Open
In this research, cold compaction behavior and pressureless sinterability of WC, WC-10%wtCu and WC-30%wtCu powders were investigated. WC and WC/Cu powders were milled in a planetary ball mill for 20h. The milled powders were cold compacted…
View article: On the Finite Element Free Vibration Analysis of Delaminated Layered Beams: A New Assembly Technique
On the Finite Element Free Vibration Analysis of Delaminated Layered Beams: A New Assembly Technique Open
The dynamic analysis of flexible delaminated layered beams is revisited. Exploiting Boolean vectors, a novel assembly scheme is developed which can be used to enforce the continuity requirements at the edges of delamination region, leading…
View article: Effects of Machine Tool Spindle Decay on the Stability Lobe Diagram: An Analytical-Experimental Study
Effects of Machine Tool Spindle Decay on the Stability Lobe Diagram: An Analytical-Experimental Study Open
An analytical-experimental investigation of machine tool spindle decay and its effects of the system’s stability lobe diagram (SLD) is presented. A dynamic stiffness matrix (DSM) model for the vibration analysis of the OKADA VM500 machine …
View article: Dynamic Finite Element Analysis of Bending-Torsion Coupled Beams Subjected to Combined Axial Load and End Moment
Dynamic Finite Element Analysis of Bending-Torsion Coupled Beams Subjected to Combined Axial Load and End Moment Open
The dynamic analysis of prestressed, bending-torsion coupled beams is revisited. The axially loaded beam is assumed to be slender, isotropic, homogeneous, and linearly elastic, exhibiting coupled flexural-torsional displacement caused by t…