Results 251 to 260 of about 24,495 (308)

Inducing a chiral twist in achiral porphyrins: tailoring molecular interactions for circularly polarized luminescence from chiral microflowers. [PDF]

Chem Sci
Cheran A, Marydasan B, Das S, Pattam HK, Kumar J.   +4 more
europepmc   +1 more source

Low-Profile Piezoelectric Inertial Linear Actuator for High-Power Applications. [PDF]

Micromachines (Basel)
Mažeika D, Bareikis R, Čeponis A.
europepmc   +1 more source

Elastomer with Microchannel Nanofiber Array Inspired by Rabbit Cornea Achieves Rapid Liquid Spreading and Reduction of Frictional Vibration Noise. [PDF]

Biomimetics (Basel)
Zhang B, Jiang L, Fang R.
europepmc   +1 more source

Stability analysis and noise reduction of a cone-type poppet valve in an aero-hydraulic system. [PDF]

Sci Rep
Chen W, Chen Y, Xu Y, Zhang L.
europepmc   +1 more source

Quenching of Self-Excited Vibrations

Journal of Vibration and Acoustics, 1989
A passive vibration control system for the quenching of undesirable self-excited vibrations in mechanical systems is presented. The system is a Lanchester damper, attached to the main self-excited system; a van der Pol oscillator. A first-order perturbation solution shows that complete quenching of self-excited vibration is possible.
K. R. Asfar
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Self-Excited Vibrations in Drillstrings

SPE Annual Technical Conference and Exhibition, 1987
Abstract Vibrations created by drag bits can cause premature failure of drillstring components and fracture cutters. Unfortunately, there has been no theory that adequately explains how drag bits excite drillstrings. Our paper shows that these vibrations are self excited by the interaction of drillstring, bit, and formation. Results show
C.A. Zamudio, J.L. Tlusty, D.W. Dareing
openaire   +1 more source

Experimental investigation on the avoidance of self-excited vibrations

Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2007
Self-excited vibrations are observed in many technical applications. Frictional contacts are often involved in the mechanism which generates vibrations. Reasons for the excitation mechanisms are decreasing friction characteristics depending on the sliding velocity, fluctuating normal loads or different geometrical effects.
Matthias, Kröger, Marcus, Neubauer, Karl, Popp   +2 more
openaire   +2 more sources