Additive manufacturing (AM) has gained significant traction in the production of high-performance metallic components, yet concerns persist regarding consistency powder materials and mechanical properties 3D-printed parts. This study addresses these challenges through a detailed analysis maraging steel part manufactured using laser bed fusion. The demonstration was evaluated for geometric accuracy, surface roughness, chemical composition, microstructure, properties, including hardness...

This paper presents a theoretical and finite element (FE) formulation of three-layered smart beam with two piezoelectric layers acting as sensors or actuators. For the definition mechanical model partial layerwise theory is considered for approximation displacement field core face layers. An electrical different electric boundary conditions (EBC), namely, electroded either closed- open-circuit electrodes potential prescribed without electrodes, considered. Using variational formulation,...

Modal control and spatial filtering technologies for mitigation of vibration and/or structural acoustics radiation may be achieved through the use distributed modal piezoelectric transducers with properly shaped electrodes. This approach filters out undesirable uncontrollable modes over bandwidth interest in order to increase robustness stability controlled system, also yield higher values generalized electromechanical coupling coefficient, which is an important design parameter achieving...

A velocity feedback control system is evaluated in the active of vibrations a smart beam with pair surface mounted piezoelectric ceramic patches, and finite element (FE) model results are validated against measured ones. To this end, three-layered FE utilized, where partial layerwise theory fully coupled electro-mechanical considered for formulation displacement field electric potential, respectively. Regarding test rig, it consists cantilever aluminum two patches close to clamped end. One...

The main specification in the verification by testing of space hardware vulnerability to shock excitations is response spectrum. Although it compiles most relevant information needed describe overall environment characteristics, still poses various difficulties and uncertainties concerning suitability operation test system used, adequate definition underlying parameters. approach followed from interpretation typical specifications development, validation, characterization developed system,...

This article concerns the adaptive feedforward control of vibration a freely supported beam with two distinct surface mounted hybrid active—passive damping treatments. The first configuration use an Active Constrained Layer Damping (ACLD) patch alone, where piezoelectric constraining layer is actively utilized to increase shear deformation sandwiched passive viscoelastic and at same time apply forces moments into structure, which will balance power flows denoted by ACLD configuration. second...

This paper aims to present the design of a new 3D-printed continuously variable transmission (CVT) developed for an electric vehicle prototype competing in Shell Eco-marathon battery category, world-wide energy efficiency competition sponsored by Shell. The proposed system is composed polymeric conic geared friction wheel assembled motor axle and directly coupled rear tire vehicle. conical shape allows implement continuous variation diameter contact with tire. was mounted over board linear...

Robotics is undoubtedly one of the most influential fields modern technology in changing very nature our society. Parallel Delta robots have for a long time been mainly focused on niche market; however, compared to serial anthropomorphic they present several simplicity and improved dynamics features. Additive manufacturing (AM) 3D-printing technologies are enabling rapid changes robotic engineering as we classically know it, allowing greater creativity freedom mechatronics design innovation....

This article focuses on the use of fused deposition modeling (FDM) technology to manufacture and test polymer isogrid lattice cylindrical shell (LCS) structures with equilateral triangular unit-cells using non-professional conventional 3D printing software hardware. A parametric automated model for these is created in SolidWorks Visual Basic (VBA) programming language. Different configurations LCS structure are modeled, manufactured, tested order determine compressive structural strength...

This paper addresses the functional verification and performance assessment of an ultra-low shock non-explosive actuator appropriate to space applications hold-down release mechanisms. To demonstrate that design implementation manufacturing methods have resulted in engineering model conforming set functional, environmental requirements specified, a qualification test campaign is typically required. ensure readiness adequacy mechanical electrical ground support equipment required for entire...

This paper concerns the mathematical modeling and finite element (FE) solution of general anisotropic shells with hybrid active-passive damping treatments. A fully-coupled piezo-visco-elastic model shell (host structure) segmented arbitrarily stacked layers treatments is considered. discrete layer approach employed in this work, weak form governing equations derived for a single generic multilayer using Hamilton’s principle mixed (displacement/stresses) definition displacement field. First,...