Results 111 to 120 of about 35,563 (301)
Active Metamaterials with Tunable Shear Nonreciprocity and Nonlinear Dynamics. [PDF]
Adv Sci (Weinh)Active gear‐based mechanical metamaterials enable simultaneous control of translational and torsional stiffnesses by 30–100×, break shear reciprocity under positive versus negative loads, broadly tune resonant frequencies, and offer programmable dynamic responses.
Fang X, Yu M, Yu D, Cheng L.
europepmc +2 more sources
ActuatorsElectric helicopters represent a pivotal component in the advancement of urban air mobility (UAM), with considerable potential for future development. The electric propulsion system (EPS) is the core component of these systems.
Hanjie Jia +4 more
doaj +1 more source
Resonant Acoustic Determination of Complex Elastic Moduli [PDF]
, 1991 A simple, inexpensive, yet accurate method for measuring the dynamic complex modulus of elasticity is described. Using a 'free-free' bar selectively excited in three independent vibrational modes, the shear modulus is obtained by measuring the frequency ...
Brown, David A., Garrett, Steven L.
core +1 more source
Electromechanical Magnetization Switching
, 2015 We show that the magnetic moment of a composite multiferroic torsional oscillator can be switched by the electric field. The 180$^o$ switching arises from the spin-rotation coupling and is not prohibited by the different symmetry of the magnetic moment ...
Chudnovsky E. M. +2 more
core +2 more sources
On the Torsional Vibration of Shafting
Journal of Zosen Kiokai, 1933 We have had hard experience of many troubles for torsional vibrations in the shafting of Diesel ship; and as a result of available experiments in recent years, the progress of research works in this section is so great, that we can now calculate the critical speeds for torsional vibrations and manage the problems in the design.
openaire +2 more sources
Overcrowded Alkene Photo‐Redox‐Switches Based on Quinolinium/Carbene Building Blocks
Angewandte Chemie International Edition, EarlyView.A modular synthesis of a new class of photo‐ and redox‐switches is described based on the combination of quinolinium salts and carbenes. Photochemical switching allows to selectively switch between folded E/Z isomers, while electrochemical switching allows to change between neutral, radical cation and dicationic oxidation states, which are all isolable
Chris Burdenski +10 more
wiley +1 more source
Work Versus Force: Simultaneous Processes for Describing Interactions
Advanced Physics Research, EarlyView.ABSTRACT Achieving a unified description of interactions remains an open challenge in theoretical physics, which currently describes four fundamental forces. This situation may be viewed differently when interactions are formulated in terms of processes (work as actio) rather than forces (force as actio), not only at the macroscopic level but also at ...
Grit Kalies +2 more
wiley +1 more source
Predictive Control Structure for a Two-Mass Drive System with a Two-Layer Observer
EnergiesThis paper presents the control problem of a drive system with an electric motor and a finitely stiff shaft. In such a system, effective damping of torsional vibrations requires the use of advanced control structures.
Karol Wróbel +2 more
doaj +1 more source
Modal analysis of multistage gear systems coupled with gearbox vibrations [PDF]
An analytical procedure to simulate vibrations in gear transmission systems is presented. This procedure couples the dynamics of the rotor-bearing gear system with the vibration in the gear box structure. The model synthesis method is used in solving the
Choy, F. K. +4 more
core +1 more source
Chemistry – A European Journal, EarlyView.Copper(I) hydride complexes often exhibit diverse aggregation behavior that can profoundly influence their structure and reactivity. In this study we use a combined experimental and computational approach to identify key structural an electronic factors that govern aggregation in PNNP dicopperhydride complexes.
Roel Laurentius Maria Bienenmann +5 more
wiley +1 more source