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The clutch systems have a variety of disturbing dynamic phenomena. One of them, the problem of dynamic engagement, firstly is considered by measurement and analytically. Then a 3D-multibody system is created in order to describe the clutch system dynamics. This model is applied for the research of the problem of dynamic engagement, the engagement rattle and the clutch pedal vibrations. To validate the model the simulation results are compared with the experimental results.
Kupplungssystem --- dynamic phenomena --- dynamische Phänomenen --- multibody system --- Mehrkörpersystemclutch
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Based on a formalism to simulate mechanical rigid body systems with plane frictional contacts, an extension to systems with rolling contacts is proposed. A special focus is put on tagential contact compliance. A mathematical convergency proof of the solution of the tangential elastic formulation to the rigid one is proposed.
Kontaktmechaniknonholonomic --- Mehrkörperdynamik --- regularization --- nichtholonom --- multibody systems --- Zwangsbedingung --- contact mechanics --- Regularisierung --- constraints
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A specific cost-efficient type of plain journal bearing is the porous journal bearing, which possesses a pervious bush that serves as a lubricant reservoir. The current work is concerned with modeling porous journal bearings in multibody systems, for which dynamical models are needed to investigate the bearing’s behavior. Such porous journal bearing models as well as models of elementary rotor-bearing systems including these, were developed and investigated during the course for this work.
mixed lubrication --- multibody systems --- porous journal bearing --- nonlinear dynamics --- rotor dynamics
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This volume collects the papers published on the special issue “Kinematics and Robot Design IV, KaRD2021” (https://www.mdpi.com/journal/robotics/special_issues/KaRD2021), which is the forth edition of the KaRD special-issue series, hosted by the open-access journal “MDPI Robotics”. KaRD series is an open environment where researchers can present their works and discuss all the topics focused on the many aspects that involve kinematics in the design of robotic/automatic systems. Kinematics is so intimately related to the design of robotic/automatic systems that the admitted topics of the KaRD series practically cover all the subjects normally present in well-established international conferences on “mechanisms and robotics”. KaRD2021, after the peer-review process, accepted 12 papers. The accepted papers cover some theoretical and many design/applicative aspects.
parallel manipulator --- RoboMech --- kinematic synthesis and analysis --- Chebyshev and least-square approximations --- upper limb rehabilitation --- bio-inspired exoskeleton --- cable-driven system --- over-actuation --- Hill’s model --- EP control --- torque adjusting mechanism --- differential evolution --- robot modeling and simulation --- robot design --- dynamic modelling --- rehabilitation robotics --- computational modelling --- simulation --- MATLAB --- Simulink --- SimScape --- SimScape Multibody --- finger grip --- elderly --- ergonomics --- pinch assistant --- pinch force --- usability --- planar linkages --- indeterminate linkages --- screw theory --- collaborative robots --- small-scale production --- skill-based programming --- machine design --- dimensional synthesis --- useful workspace --- performance index --- kinetostatics --- biomimetics --- underwater robots --- robotics --- multibody systems --- transmission systems --- autonomous underwater vehicles --- kinematic synthesis of robots --- mixed-position synthesis --- twist systems --- functional electrical stimulation --- six-bar linkage --- Watt II --- Stephenson III --- performance tricycle --- mechanism optimization --- kinematics --- topology --- design optimization --- dexterity --- inspection
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The combination of physical sensors and computational models to provide additional information about system states, inputs and/or parameters, in what is known as virtual sensing, is becoming increasingly popular in many sectors, such as the automotive, aeronautics, aerospatial, railway, machinery, robotics and human biomechanics sectors. While, in many cases, control-oriented models, which are generally simple, are the best choice, multibody models, which can be much more detailed, may be better suited to some applications, such as during the design stage of a new product.
Kalman filter --- motion capture --- gait analysis --- inertial sensor --- rail vehicles --- track irregularities --- multibody dynamics --- inertial sensors --- computer vision --- singular configuration --- parallel robot --- motion control --- 3D tracking --- screw theory --- Kalman filtering --- coupled states-inputs estimation --- virtual sensors --- slider-crank mechanism --- virtual sensoring --- physical sensors --- smart/intelligent sensors --- sensor technology and applications --- sensing principles --- signal processing in sensor systems --- symbolic generation --- real-time computation --- human-in-the-loop --- haptic devices --- parameter estimation --- curve fitting method --- hydraulic system --- predictive maintenance --- characteristic curve --- product life cycle --- digital twin --- adaptive Kalman filter --- nonlinear models --- virtual sensing --- multibody based observers --- vehicle dynamics estimation --- sideslip angle estimation --- factor graph --- graphical models --- movable repetitive lander --- fault-tolerant soft-landing --- landing configuration --- stability optimization --- n/a
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This book contains state-of-the-art experimental and numerical studies showing the most recent advancements in the field of rotary wing aerodynamics and aeroelasticity, with particular application to the rotorcraft and wind energy research fields.
rotary-wing aerodynamics --- rotor interaction --- eVTOL aircraft --- computational fluid dynamics --- vortex particle method --- blade design --- wind turbine model --- wind tunnel --- natural laboratory --- vortex detection criterion --- BEM method --- tip vortex interactions --- DAWT --- ducted wind turbine --- H type Darrieus --- VAWT --- dynamic stall --- leading edge vortex --- aeroelasticity --- fluid-structure interaction --- multibody dynamics --- tiltrotor --- handling qualities --- piloted simulation --- wind turbine wake --- helicopter vortex–rotor interaction --- wake vortex encounter --- helicopter offshore operation --- flight safety --- rotorcraft --- offshore wind energy --- n/a --- helicopter vortex-rotor interaction
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Multibody systems with flexible elements represent mechanical systems composed of many elastic (and rigid) interconnected bodies meeting a functional, technical, or biological assembly. The displacement of each or some of the elements of the system is generally large and cannot be neglected in mechanical modeling. The study of these multibody systems covers many industrial fields, but also has applications in medicine, sports, and art. The systematic treatment of the dynamic behavior of interconnected bodies has led to an important number of formalisms for multibody systems within mechanics. At present, this formalism is used in large engineering fields, especially robotics and vehicle dynamics. The formalism of multibody systems offers a means of algorithmic analysis, assisted by computers, and a means of simulating and optimizing an arbitrary movement of a possibly high number of elastic bodies in the connection. The domain where researchers apply these methods are robotics, simulations of the dynamics of vehicles, biomechanics, aerospace engineering (helicopters and the behavior of cars in a gravitational field), internal combustion engines, gearboxes, transmissions, mechanisms, the cellulose industry, simulation of particle behavior (granulated particles and molecules), dynamic simulation, military applications, computer games, medicine, and rehabilitation.
Technology: general issues --- History of engineering & technology --- symmetry --- asymmetry --- measure of skewness --- decile --- Monte Carlo algorithm --- Gibbs–Appell --- energy of accelerations --- finite element --- nonlinear system --- elastic elements --- analytical dynamics --- robotics --- Hilbert’s inequality --- Fubini theorem --- Fenchel-Legendre transform --- time scale --- fractional derivative --- skin tissues --- thermal damages --- Laplace transforms --- Kane’s equations --- planar mechanism --- Lagrange’s equations --- dynamics --- finite element method (FEM) --- multibody system (MBS) --- wind water pump --- strands wire rope --- experimental transitory vibrating regime --- stiffness --- damping --- joint time-frequency analysis --- Prony method --- matrix pencil method --- multibody --- propulsion drive --- linear motion --- eccentric trajectory --- reusable launch vehicles --- soft landing --- magnetorheological fluid --- numerical simulation --- multibody systems with flexible elements --- elastic bonds --- vibrations --- initial matrix --- stiffness matrix --- stability --- laser --- nuclear installation --- insulation --- Extreme Light Infrastructure --- gamma ray --- flexible coupling --- bolt --- non-metallic element --- finite element method --- elastic characteristic --- Light Sport Aircraft --- conceptual aircraft design --- wing --- flap --- aileron --- weight estimation --- symmetric profile --- sustainability --- mosquito borne diseases --- Aedes Aegypti --- Wolbachia invasion --- impulsive control --- time scales --- Noether theory --- conserved quantity --- elastic coupling --- non-metallic elements --- dynamic rigidity --- non-collinearly shafts --- n/a --- Gibbs-Appell --- Hilbert's inequality --- Kane's equations --- Lagrange's equations
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This Special Issue highlights the latest enhancements in the abatement of noise and vibrations in aerospace and automotive systems. The reduction of acoustic emissions and the improvement of interior cabin comfort desired by all major transportation industries, as these areas have a direct impact on customer satisfaction and, consequently, the commercial success of new products. Topics covered in this Special Issue deal with computational approaches, instrumentation and data analysis related to noise and vibrations of fixed-wing aircraft, satellites, spacecraft, automobiles, and trains, covering aerodynamically generated noise, engine noise, sound absorption, cabin acoustic treatments, duct acoustics, and vibroacoustic properties of materials. This Special Issue also focuses on industrial aspects. Existing procedures and algorithms that are useful in reaching the abovementioned objectives in the most efficient way are illustrated in the collected papers.
flexible spacecraft --- periodic disturbance compensation --- compensate torque design --- vibration attenuation --- reaction wheel. --- vibration analysis --- FEM --- multibody simulations --- Plasma flow control --- multichannel discharge --- plasma synthetic actuator --- actuator array --- analytic model --- centrifugal fan --- unsteady flow --- vibroacoustics --- fluid-structure-acoustic coupling --- optimization --- high-speed train --- pantograph --- aerodynamic noise --- large eddy simulation --- acoustic finite element method --- transonic buffet --- tangential slot --- steady and periodic blowing --- postpone of buffet onset --- buffet load alleviation --- component mode synthesis --- petrol engine --- NVH --- FRF --- leakage location --- Lamb wave --- beamforming --- spacecraft in orbit --- vibro-acoustics --- MDO --- aircraft fuselage --- aeroacoustics --- acoustics --- noise --- vibration --- aeronautics --- automotive
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It is well known that many structural and physical problems cannot be solved by analytical approaches. These problems require the development of numerical methods to get approximate but accurate solutions. The minite element method (FEM) represents one of the most typical methodologies that can be used to achieve this aim, due to its simple implementation, easy adaptability, and very good accuracy. For these reasons, the FEM is a widespread technique which is employed in many engineering fields, such as civil, mechanical, and aerospace engineering. The large-scale deployment of powerful computers and the consequent recent improvement of the computational resources have provided the tools to develop numerical approaches that are able to solve more complex structural systems characterized by peculiar mechanical configurations. Laminated or multi-phase composites, structures made of innovative materials, and nanostructures are just some examples of applications that are commonly and accurately solved by the FEM. Analogously, the same numerical approaches can be employed to validate the results of experimental tests. The main aim of this Special Issue is to collect numerical investigations focused on the use of the finite element method
beam element --- Quasi-3D --- static bending --- functionally graded beam --- Monte Carlo method --- coalbed methane --- stochastic fracture network --- fracture geometric parameters --- dual-porosity and dual-permeability media --- finite element method --- three-phase composite materials --- Finite Element modeling --- sandwich plates --- zig-zag theory --- carbon nanotubes --- free vibrations --- soda-lime glass --- cohesive zone model --- rate-dependent --- impact loading --- finite element --- FGM --- plate --- material-oriented shape functions --- NURBS --- Finite elements --- finite bending --- 3D elasticity --- Eulerian slenderness --- compactness index --- Searle parameter --- Elastica --- pultruded beams --- effective stiffness matrix --- FRP --- hollow circular beams --- rigid finite element method --- composite --- steel-polymer concrete --- machine tool --- multibody system --- orthotropic failure criteria --- implementation --- plasticity --- masonry --- geometric nonlinearity --- FEM --- thermoelasticity --- bowing --- transient heat flux --- acoustic black holes --- acoustic-oriented design --- additive manufacturing --- vibroacoustics --- material parameter identification --- model order reduction --- reinforced concrete --- finite element analysis --- crack band --- strain localization --- post-peak softening --- viscoplastic regularization --- convergence --- mesh sensitivity --- bond–slip --- flexural behavior --- n/a --- bond-slip
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This book covers a wide range of topics in the orthopaedic fields and can be used as a textbook for the final undergraduate engineering course or as a topic on tribology at the postgraduate level. This book can serve as a useful reference for academics, tribology, and materials researchers; mechanical, materials, and physics engineers; biomedical scientists and professionals in tribology; and related industries. The scientific interest in this book will be evident for many important centres of research, including laboratories and universities throughout the world.
vitamin-E stabilized PE --- cross-linked PE --- standard PE --- hip simulator --- FTIR analysis --- Ti-28Nb-35.4 alloy --- powder metallurgy --- ball milling --- mechanical properties --- biocompatibility --- total hip arthroplasty --- musculoskeletal multibody model --- dynamic loading --- finite element analysis --- radial clearance --- dry and wet friction --- digital image correlation --- homogeneous strain --- small deformation level --- accuracy --- precision --- calcium phosphate cements --- polarization --- CoCr alloy --- wear particles --- hyaluronic acid --- macrophages biocompatibility --- UHMWPE --- tribology --- h-index --- bibliometric indicators --- biomaterials --- quality of research --- citations --- ceramic --- friction --- hip --- implants --- polyethylene --- prosthesis --- simulator --- wear --- mandible condylar fractures --- surgical treatment --- titanium --- PLLA --- Selective Laser Melting --- Direct Metal Laser Sintering --- porosity --- titanium alloys --- yield strength --- ultimate tensile strength --- X-Ray Diffraction --- n/a --- computational model --- biomechanics --- unicompartmental knee replacement --- CFR-PEEK --- varus and valgus alignments --- bioceramics --- additive manufacturing --- scaffolds --- bone tissue engineering
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