Results 111 to 120 of about 5,361 (218)

Determination of Dynamic Characteristics for an Aerospace Structure Using Experimental and Numerical Methods

Macromolecular Symposia, EarlyView.
ABSTRACT This research provides an in‐depth investigation into the dynamic behavior of a riveted aerospace structural component, integrating both experimental testing and numerical simulations. The primary objective is to validate a Finite Element Analysis (FEA)‐based computational methodology for accurately identifying the natural frequencies and ...
Laura‐Mariana Barbu, Mihai Valentin Predoi, Aurel Alecu   +2 more
wiley   +1 more source

Dynamics of a Rod Attached to a Rotating Hinge

Macromolecular Symposia, EarlyView.
ABSTRACT The dynamics of a rod attached to a rotating hinge, also interpreted as a physical pendulum in a rotating frame, provide a valuable mechanical model for analyzing the complex oscillatory behavior of helicopter rotor blades. This simplified system captures essential features of blade flapping and in‐plane motions influenced by inertial and ...
Gheorghe Floroiu, Mihai Valentin Predoi, Roxana Alexandra Petre   +2 more
wiley   +1 more source

Are Academic Executives Greener? Evidence From China

Managerial and Decision Economics, EarlyView.
ABSTRACT This paper investigates the impact of executives with academic backgrounds (“academic executives”) on corporate green patents. We find that both the presence of academic executives and the proportion of academic executives have a significantly positive impact on firms' green patents, and this effect is positively associated with the firm's ...
Kai Xing, Xiong Li, Ping Liu, Hanxiong Zhang, Yuhan Xiao   +4 more
wiley   +1 more source

Uncertainty, Sensitivity, and Efficiency Analysis of a Hybrid Piezoelectric–Electromagnetic Energy Harvester

International Journal of Mechanical System Dynamics, EarlyView.
ABSTRACT Digitalization and emerging technologies are increasing the demand for wireless sensing and the Internet of Things (IoT), which provide opportunities for autonomous sources of electricity in the form of energy harvesting systems. This paper focuses on the challenges in hybrid piezoelectric‐electromagnetic kinetic energy harvesting systems that
Petr Sosna, Damian Gaska, Zdeněk Hadaš
wiley   +1 more source

Fault Detection of Electric Motors via Symmetrized Dot Pattern‐Based Features

International Journal of Mechanical System Dynamics, EarlyView.
ABSTRACT This study proposes a novel symmetrized dot pattern (SDP) approach using designed SDP‐based features, extracted from transformed vibration signals, for fault detection. These features describe the compactness, inclination, and shape of the “snowflake” diagram distributions.
Mario Spirto, Pierangelo Malfi, Armando Nicolella, Francesco Melluso, Chiara Cosenza, Sergio Savino, Vincenzo Niola   +6 more
wiley   +1 more source

Detecting Loosening of Bolt‐Flanged Pipe Using Smoothed Pseudo Wigner–Ville Distribution: Digital Twin‐Based Approach Using Convolution Neural Networks

International Journal of Mechanical System Dynamics, EarlyView.
ABSTRACT In this paper, an integrated digital twin‐based fault‐diagnosis framework is proposed to detect bolt loosening in flanged pipe connections. The approach combines finite element‐based numerical modeling, experimental modal analysis, and advanced signal processing‐assisted deep learning to achieve reliable loosening detection under operational ...
Milad Shabani Yousefabad, Behzad Totakhaneh Bonab, Morteza Homayoun Sadeghi, Mir Mohammad Ettefagh, Mohammad Reza Chalak Qazani   +4 more
wiley   +1 more source

A Geometrically Regularized Gradient‐Damage Model With Orthogonality‐Based Energy Split for Dynamic Anisotropic Compression‐Shear Fracture

International Journal for Numerical and Analytical Methods in Geomechanics, EarlyView.
ABSTRACT This study proposes a novel geometrically regularized gradient‐damage model for simulating dynamic mixed‐mode fracture in orthotropic materials with tension–compression asymmetry. In this model, a thermodynamic framework is formulated by incorporating damage dissipation into internal energy evolution, from which the constitutive relation and ...
Hui Li, Shanyong Wang
wiley   +1 more source

Approximate Reachability for Feedback Linearizable Systems

Optimal Control Applications and Methods, EarlyView.
The backwards reachable set for a dynamical system is the set of states for which there exists a constraint admissible trajectory that reaches a given terminal set. Conventional grid‐based approaches for computing these sets are intractable for many applications.
Vincent Liu, Chris Manzie, Peter M. Dower   +2 more
wiley   +1 more source

Digital surveillance of animals and nature recovery

People and Nature, EarlyView.
Abstract Digital surveillance technologies (DSTs) are widely applied in nature recovery for their potential to generate novel data on species and ecosystems through digital tracking, automation (e.g. from hazardous locations) and from newly recruited citizen scientists.
William M. Adams
wiley   +1 more source

Evaluation of Graphene Oxide–Modified Repair Methodologies in Carbon Fiber Reinforced Polymer Composites for Aerospace Applications

Polymer Composites, EarlyView.
Schema 1. Schematic representation of the graphene oxide (GO)‐modified wet lay‐up repair strategy for CFRP laminates, illustrating stepwise ply removal, incorporation of GO into the epoxy repair matrix, and the enhanced mechanical performance of the repaired laminate.
Togay Yildirim, Tugba Soganci Aras
wiley   +1 more source