A two‐dimensional theory for high‐frequency vibrations of piezoelectric crystal plates with or without electrodes

1987 ◽  
Vol 61 (4) ◽  
pp. 1249-1262 ◽  
Author(s):  
P. C. Y. Lee ◽  
S. Syngellakis ◽  
J. P. Hou
Keyword(s):  
High Frequency ◽  
Two Dimensional ◽  
Piezoelectric Crystal ◽  
Dimensional Theory ◽  
High Frequency Vibrations

Appearance of intramolecular high-frequency vibrations in two-dimensional, time-integrated three-pulse photon echo data

2007 ◽  
Vol 9 (6) ◽  
pp. 701-710 ◽  
Author(s):  
Benjamin Dietzek ◽  
Niklas Christensson ◽  
Pär Kjellberg ◽  
Torbjörn Pascher ◽  
Tõnu Pullerits ◽  
...  
Keyword(s):  
High Frequency ◽  
Photon Echo ◽  
Two Dimensional ◽  
Pulse Photon ◽  
High Frequency Vibrations

Axially Symmetric Extensional Vibrations of a Circular Disk With a Concentric Hole

1959 ◽  
Vol 26 (4) ◽  
pp. 541-545
Author(s):  
O. G. Gustafsson ◽  
T. R. Kane
Keyword(s):  
High Frequency ◽  
Circular Disk ◽  
Two Dimensional ◽  
Axially Symmetric ◽  
Dimensional Theory ◽  
Isotropic Plates

Abstract In a paper by T. R. Kane and R. D. Mindlin, a two-dimensional theory was developed for high-frequency extensional vibrations of elastic, isotropic plates. This theory is now used to study vibrations of a circular disk with a concentric hole.

Simulation of vibration piercing of pipe blank at press

2020 ◽  
Vol 76 (11) ◽  
pp. 1128-1138
Author(s):  
S. R. Rakhmanov
Keyword(s):  
High Frequency ◽  
Deformation Zone ◽  
Pipe Blank ◽  
Equipment Operation ◽  
Metal Deformation ◽  
Technological Tool ◽  
High Frequency Vibrations ◽  
Pipe Blanks ◽  
Wave Phenomena

In some cases, the processes of piercing or expanding pipe blanks involve the use of high-frequency active vibrations. However, due to insufficient knowledge, these processes are not widely used in the practice of seamless pipes production. In particular, the problems of increasing the efficiency of the processes of piercing or expanding a pipe blank at a piercing press using high-frequency vibrations are being solved without proper research and, as a rule, by experiments. The elaboration of modern technological processes for the production of seamless pipes using high-frequency vibrations is directly related to the choice of rational modes of metal deformation and the prediction resistance indicators of technological tools and the reliability of equipment operation. The creation of a mathematical model of the process of vibrating piercing (expansion) of an axisymmetric pipe blank at a piercing press of a pipe press facility is an actual task. A calculation scheme for the process of piercing a pipe plank has been elaborated. A dependence was obtained characterizing the speed of front of plastic deformation propagation on the speed of penetration of a vibrated axisymmetric mandrel into the pipe workpiece being pierced. The dynamic characteristics of the occurrence of wave phenomena in the metal being pierced under the influence of a vibrated tool have been determined, which significantly complements the previously known ideas about the stress-strain state of the metal in the deformation zone. The deformation fields in the zones of the disturbed region of the deformation zone were established, taking into account the high-frequency vibrations of the technological tool. It has been established that the choice of rational parameters (amplitude-frequency characteristics) of the vibration piercing process of a pipe blank results in significant increase in the efficiency of the process, the durability of the technological tool and the quality of the pierced blanks.

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