scholarly journals Grouping of particles in a wideband ultrasonic field

2021 ◽  
Vol 2140 (1) ◽  
pp. 012014
Author(s):  
D Y Sukhanov ◽  
S N Rosliakov
Keyword(s):  
Standing Wave ◽  
Complex Shape ◽  
Standing Waves ◽  
Ultrasonic Field ◽  
Wideband Signal ◽  
Plane Parallel ◽  
Multiple Particles ◽  
Acoustic Tweezers ◽  
And Control

Abstract In this paper, we propose to expand the capabilities of wideband levitation and show the possibility of forming a structure of a complex shape based on focusing a wideband field in a given area. Focusing the field of planar radiating arrays makes it possible to form a region of stable levitation in a plane parallel to the arrays. The counter radiation of the two arrays creates a standing wave, at the nodes of which the particles are grouped. The use of a wideband signal makes it possible to create many stable nodes of standing waves in specified areas, and to realize the required shape of the levitating object. Simultaneous monitoring of multiple particles in a wideband ultrasonic field may become a new direction in the development of methods of acoustic trapping and control of particles, as well as technologies of acoustic tweezers.

scholarly journals Instability of standing waves for non-linear Schrödinger-type equations

1988 ◽  
Vol 8 (8) ◽  
pp. 119-138 ◽  
Keyword(s):  
Dynamical Systems ◽  
Standing Wave ◽  
Optical Waveguides ◽  
Standing Waves ◽  
Positive Eigenvalue ◽  
Shooting Argument ◽  
Wave Solutions ◽  
Non Linear ◽  
Linearized Operator

AbstractA theorem is proved giving a condition under which certain standing wave solutions of non-linear Schrödinger-type equations are linearly unstable. The eigenvalue equations for the linearized operator at the standing wave can be analysed by dynamical systems methods. A positive eigenvalue is then shown to exist by means of a shooting argument in the space of Lagrangian planes. The theorem is applied to a situation arising in optical waveguides.

scholarly journals Features of technological basing in machining parts on CNC machines

2018 ◽  
Vol 224 ◽  
pp. 01078
Author(s):  
Nicolay V. Nosov ◽  
Andrey A. Cherepashkov
Keyword(s):  
Computer Aided Design ◽  
Complex Shape ◽  
Electronic Measuring ◽  
Cnc Machines ◽  
Control Programs ◽  
Integrated Technique ◽  
Aided Design ◽  
And Control ◽  
Numerical Program ◽  
Numerical Program Control

The article discusses the problems of computer aided design and technological preparation of production of complex shape parts on machines with numerical program control. An integrated technique for designing processes and control programs for CNC machines is proposed and described, using the technique of software-based referencing and modern electronic measuring tools.

Electric birefringence for monitoring size changes in clay suspensions

Clay Minerals ◽  
1996 ◽  
Vol 31 (4) ◽  
pp. 549-556 ◽  
Author(s):  
I. C. Hinds ◽  
P. J. Ridler ◽  
B. R. Jennings
Keyword(s):  
Colloidal Suspensions ◽  
High Sensitivity ◽  
Ultrasonic Field ◽  
Decay Rates ◽  
Continuous Change ◽  
Particle Size Range ◽  
On Line ◽  
Clay Suspensions ◽  
Pulsed Fields ◽  
And Control

AbstractThe growth and decay rates of rapid, induced electro-optical phenomena in dilute colloidal suspensions are characteristic of the geometry of the solute particles. The speed of measurement renders such methods especially relevant for fast, in situ analyses of the size and size distribution of colloids in practical, industrial situations where these properties may be undergoing continuous change. The principles of the measurement of electrically induced birefringence using pulsed fields is outlined and used to study vermiculite suspensions as they undergo size reduction in an ultrasonic field. The high sensitivity of the method to both the particle size range and the form of the distribution function is indicated. The use of the method for on-line monitoring of dilute mineral suspensions for the indication and control of aggregated, dissolving or growing media is discussed.

Levitation and Control for an Ordered Group of Particles and Rectilinear Structures in an Ultrasonic Field

2020 ◽  
Vol 66 (2) ◽  
pp. 137-144
Author(s):  
D. Ya. Sukhanov ◽  
S. N. Roslyakov ◽  
F. S. Emel’yanov
Keyword(s):  
Ultrasonic Field ◽  
Ordered Group ◽  
And Control

Formation and Control of a Rotating Magnetic Field in Magnetic Abrasive Finishing

2016 ◽  
Author(s):  
Thamir Al-dulaimi ◽  
Mir Behrad Khamesee
Keyword(s):  
Complex Shape ◽  
Rotating Magnetic Field ◽  
Advanced Materials ◽  
Surface Finishing ◽  
Manufacturing Cost ◽  
Hard Materials ◽  
Abrasive Finishing ◽  
And Control ◽  
Quality Surface ◽  
Final Operation

Surface finishing is the final operation in manufacturing processes and it costs around 15% of the total manufacturing cost [1]. A high quality surface with very low values of surface roughness and high accuracy are required for some products in many applications. These characteristics are required especially for products with a complex shape which are made from advanced materials such as alloys of hard materials, glass, and ceramics.

Ultrasonic field characteristics in resonant standing waves

Ultrasonics ◽  
1997 ◽  
Vol 35 (2) ◽  
pp. 151-156 ◽  
Author(s):  
U. Fritsching ◽  
K. Bauckhage
Keyword(s):  
Standing Waves ◽  
Ultrasonic Field

On the observability of finite-depth short-crested water waves

1996 ◽  
Vol 322 ◽  
pp. 1-19 ◽  
Author(s):  
M. Ioualalen ◽  
A. J. Roberts ◽  
C. Kharif
Keyword(s):  
Standing Wave ◽  
Water Waves ◽  
Numerical Study ◽  
Standing Waves ◽  
Finite Depth ◽  
Two Dimensional ◽  
Wave Fields ◽  
Progressive Waves ◽  
Wave Limit ◽  
Narrow Bands

A numerical study of the superharmonic instabilities of short-crested waves on water of finite depth is performed in order to measure their time scales. It is shown that these superharmonic instabilities can be significant-unlike the deep-water case-in parts of the parameter regime. New resonances associated with the standing wave limit are studied closely. These instabilities ‘contaminate’ most of the parameter space, excluding that near two-dimensional progressive waves; however, they are significant only near the standing wave limit. The main result is that very narrow bands of both short-crested waves ‘close’ to two-dimensional standing waves, and of well developed short-crested waves, perturbed by superharmonic instabilities, are unstable for depths shallower than approximately a non-dimensional depth d= 1; the study is performed down to depth d= 0.5 beyond which the computations do not converge sufficiently. As a corollary, the present study predicts that these very narrow sub-domains of short-crested wave fields will not be observable, although most of the short-crested wave fields will be.

scholarly journals Dimensional reduction in 6D standing waves braneworld

2014 ◽  
Vol 24 (01) ◽  
pp. 1550009 ◽  
Author(s):  
Otari Sakhelashvili
Keyword(s):  
Exact Solution ◽  
Standing Wave ◽  
Dimensional Reduction ◽  
Cosmological Solution ◽  
Standing Waves ◽  
Massless Scalar ◽  
Dynamical Mechanism ◽  
Higher Dimensional ◽  
Braneworld Model

We found cosmological solution of the 6D standing wave braneworld model generated by gravity coupled to a massless scalar phantom-like field. By obtaining a full exact solution of the model, we found a novel dynamical mechanism in which the anisotropic nature of the primordial metric gives rise to expansion of three spatial brane dimensions and affectively reduction of other spatial directions. This dynamical mechanism can be relevant for dimensional reduction in string and other higher-dimensional theories in the attempt of getting a 4D isotropic expanding spacetime.

On Viscoelasticity and Standing Waves in Tires

1976 ◽  
Vol 4 (4) ◽  
pp. 233-246 ◽  
Author(s):  
J. Padovan
Keyword(s):  
Exact Solution ◽  
Standing Wave ◽  
Wave Phenomenon ◽  
Numerical Experiments ◽  
Standing Waves ◽  
Structural Damping ◽  
Resonance Response ◽  
Foundation Model ◽  
Stated Problem ◽  
Classical Ring

Abstract Based on the classical ring on foundation model for the tire, the effect which structural damping has on the development of the standing wave phenomenon is investigated. In particular, the model employed consists of a rotating ring on foundation where, in addition to including Coriolis effects, Kelvin-Voigt-type viscoelasticity is admitted in both the ring and foundation. Enforcing strict periodicity in space and time, the exact solution is obtained to the stated problem. Several parametric numerical experiments employing this solution are reported. These demonstrate that the standing wave phenomenon in tires is essentially a viscoelastic-type resonance response.

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