Results 131 to 140 of about 1,373,655 (201)

Analysis of unsteady flow and fluid exciting forces of multistage centrifugal pump based on actual size

Proceedings of the Institution of mechanical engineers. Part A, journal of power and energy, 2021
The unsteady flow and fluid exciting force inside the multistage centrifugal pump were analyzed on the basis of large eddy simulation (LES). The reliability of the numerical simulation was verified by the experimental performance. The performance of pump
B. Cui, Yingbin Zhang, Yakun Huang, Zuchao Zhu   +3 more
semanticscholar   +1 more source

Analytical study of exciting forces acting on a rigid sphere in a fluid with flexible base surface

ZAMM - Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik, 2020
A three‐dimensional problem of wave diffraction by a neutrally buoyant immersed sphere in a fluid having a flexible bottom surface is studied within the framework of linear potential theory.
Lopamudra Das, S. Mohapatra
semanticscholar   +1 more source

Crawling Waves from Radiation Force Excitation

Ultrasonic Imaging, 2010
Crawling waves are generated by an interference of two oscillating waves traveling in opposite directions, with a progressive movement resulting from a frequency difference or a phase difference between the sources. While the idea has been applied to numerous applications, all the previous reports used mechanical sources to vibrate the medium.
Zaegyoo, Hah, Christopher, Hazard, Young Thung, Cho, Deborah, Rubens, Kevin, Parker   +4 more
openaire   +2 more sources

Third-order first-harmonic heave exciting forces on a small partially immersed sphere in long waves

Journal of Fluid Mechanics
A small sphere fixed at various drafts was subjected to unidirectional broad-banded surface gravity wave groups to investigate nonlinear exciting forces.
Bryan Tan, J. Orszaghova, H. Wolgamot, Adi Kurniawan, Jørgen Hals Todalshaug   +4 more
semanticscholar   +1 more source

Characterizing respiratory mechanics with forced excitation techniques

Annals of Biomedical Engineering, 1981
Forced excitation techniques with sinusoidal or random signals are used to measure respiratory mechanical impedance. The real part of this impedance is the effective resistance, and it has been used to characterize mechanical function in a wide assortment of experiments and clinical studies.
R, Pimmel, J M, Fullton
openaire   +2 more sources

Excitation of atom by image forces

Physics Letters A, 2002
Parametric excitation of atom moving parallel to corrugated (or artificially structured) metallic surface due to nonadiabatic variation of image forces is considered. It is shown that the excitation can be accompanied by photon radiation. Selection rules of the process are considered.
Yu.E. Lozovik, V.A. Sharapov
openaire   +1 more source

Hydrodynamic Forces on the Advancing Slender Body with Speed Effects, II: Wave Exciting Forces

International Shipbuilding Progress, 1999
Based on Chapman's approach, wave exciting forces on slender ships with forward speed are solved by a two and half dimensional method. The governing equations are derived along characteristic lines.
Chun‐Tsung Wang, F. Chiu, Shiann-Jorng Horng   +2 more
semanticscholar   +1 more source

Resonances in periodically forced excitable systems

The Journal of Physical Chemistry, 1992
Responses to single and periodic pulse perturbations are studied in two model excitable systems, a six-variable model of the chloriteiodide reaction and a four-variable extended Oregonator, using the phase excitation curve (PEC). If the period of stimulation is not too short, the PEC enables one to use data on single-pulse stimulation to predict ...
Milos Dolnik, Milos Marek, Irving R. Epstein   +2 more
openaire   +1 more source

Parametrically excited and forced vibrations

1985
Parametrically excited vibrations occur in systems whose coefficients vary with time, mostly periodically. The presence of periodic coefficients influences the energy balance of the system. Parametrically excited vibrations can be damped, undamped, or dedamped.
P. C. Müller, W. O. Schiehlen
openaire   +1 more source

Impulse Exciter of Rotating Blades With an Increased Excitation Force

IEEE Transactions on Instrumentation and Measurement, 2019
This paper deals with electromagnetic vibration excitation of rotating machine blades in a purpose of dynamic measurement and testing. A novel method for increasing the excitation force is presented. At the same time, the suggested method allows to reduce blade remanent induction. Examples of measurements are shown, and obtained results are discussed.
openaire   +1 more source