Damping of piston mode resonance between two fixed boxes

2021 ◽  
Vol 33 (6) ◽  
pp. 062117
Author(s):  
Lei Tan ◽  
Liang Cheng ◽  
Tomoki Ikoma
Keyword(s):  
Piston Mode

High-performance SAWR strain sensor with piston-mode operation

2021 ◽  
pp. 1-1
Author(s):  
Qiang Xiao ◽  
Xiaoxin Ma ◽  
Weibiao Wang ◽  
Yanping Fan ◽  
Ping Cai ◽  
...  
Keyword(s):  
High Performance ◽  
Strain Sensor ◽  
Mode Operation ◽  
Piston Mode

Wideband double-mode bulk acoustic wave resonator filters on lithium niobate using periodically slotted electrodes

2021 ◽  
Author(s):  
Ting Wu ◽  
Yu-Po Wong ◽  
Yiwen He ◽  
Jing-Fu Bao ◽  
Ken-ya Hashimoto
Keyword(s):  
Lithium Niobate ◽  
Frequency Separation ◽  
Bulk Acoustic Wave ◽  
3D Analysis ◽  
Transverse Modes ◽  
Resonance Modes ◽  
Bulk Acoustic Wave Resonator ◽  
Wave Resonator ◽  
Piston Mode ◽  
Resonator Filters

Abstract Abstract: This paper discusses applicability of periodically slotted electrodes for realization of wideband transversely-coupled double-mode resonator filters using lithium niobate (LN) thin plate. First, two-dimensional analysis is carried out, and it is shown that the periodic structure is effective to control the frequency separation between two resonance modes, and synthesis of the fractional bandwidth larger than 24% is achievable. Next, 3D analysis is performed for suppression of spurious resonances. It is shown that the mass loading at aperture edges is effective for the piston mode operation, and transverse modes can be well suppressed. It is also pointed out that the bottom electrode should be covered only the aperture region and removed from the busbar and gap regions for suppression of unwanted resonances. With these proper edge treatments, spurious-free and wide passband can be synthesized.

Numerical Analysis of a Floating Body With Two-Dimensional Moonpool Including Piston Mode

2010 ◽  
Author(s):  
Jaekyung Heo ◽  
Jong-Chun Park ◽  
Moo-Hyun Kim ◽  
Weon-Cheol Koo
Keyword(s):  
Free Surface ◽  
Viscous Flow ◽  
Experimental Results ◽  
Floating Body ◽  
Navier Stokes ◽  
Linear Potential ◽  
Navier Stokes Equation ◽  
Nonlinear Potential ◽  
Heave Motion ◽  
Piston Mode

In this paper, the potential and viscous flows are simulated numerically around a 2-D floating body with a moonpool (or a small gap) with particular emphasis on the piston mode. The floating body with moonpool is forced to heave in time domain. Linear potential code is known to give overestimated free-surface heights inside the moonpool. Therefore, a free-surface lid in the gap or similar treatments are widely employed to suppress the exaggerated phenomenon by potential theory. On the other hand, Navier-Stokes equation solvers based on a FVM can be used to take account of viscosity. Wave height and phase shift inside and outside the moon-pool are computed and compared with experimental results by Faltinsen et al. (2007) over various heaving frequencies. Pressure and vorticity fields are investigated to better understand the mechanism of the sway force induced by the heave motion. Furthermore, a nonlinear potential code is utilized to compare with the viscous flow. The viscosity effects are investigated in more detail by solving Euler equations. It is found that the viscous flow simulations agree very well with the experimental results without any numerical treatment.

Influence of displacement and patterning of phase shifters for piston mode operation of temperature compensated surface acoustic wave resonators on SiO2/LiNbO3 structure

2021 ◽  
Author(s):  
Keyuan Gong ◽  
Zhaohui Wu ◽  
Yu-Po Wong ◽  
Yawei Li ◽  
Qi Liang ◽  
...  
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Transverse Mode ◽  
Phase Shifters ◽  
Design Parameters ◽  
Mode Operation ◽  
Mode Suppression ◽  
Acoustic Wave Resonators ◽  
Piston Mode

Abstract This paper discusses influence of displacement and patterning of phase shifters for piston mode operation of the temperature compensated (TC) surface acoustic wave (SAW) resonator on SiO2/LiNbO3 structure. As the phase shifters, Cu metals placed on the top surface of SiO2 are considered. First, the conventional Cu stripes are chosen, and their displacement are considered from IDT aperture edges. It is shown that achievable transverse mode suppression is almost identical when the stripe shape is adjusted for each case. Next, Cu dots are considered as patterned phase shifters. It is shown comparable transverse mode suppression is possible also for this case. However, relatively strong SAW lateral leakage occurs when they are placed above IDT fingers. These results indicate that location and pattern can be added as design parameters for the phase shifters on SiO2. It is favorable for further enhancement of total device performances.

Spurious free thickness shear bulk acoustic resonators on lithium niobate using standard and broadband piston mode designs

2021 ◽  
Author(s):  
Ting Wu ◽  
Yu-Po Wong ◽  
Yiwen He ◽  
Chuan Peng ◽  
Jing-Fu Bao ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
Transverse Mode ◽  
Complete Suppression ◽  
Two Dimensional ◽  
Mode Structure ◽  
Acoustic Resonators ◽  
Mode Design ◽  
Dimensional Finite Element ◽  
Piston Mode ◽  
Thickness Shear

Abstract This paper describes design and fabrication of sprious-free thickness shear bulk acoustic resonators (TSBARs) using the lithium niobate (LN) plate. Previously, the authors conjected from the experiment on the TSBAR that cutoff edges with crystal LN X-plane serve as ideal reflectors for the piston mode operation, and complete suppression is possible by adding the standard piston mode design to the other edges normal to the X-axis. Following to this conjecture, the traditional piston mode structure is designed by the traditional two-dimensional finite element method, and the TSBAR is fabricated following to the design. The experiment showed complete suppression of the transverse mode resonances, and the conjecture was verified.

scholarly journals Голографические интерферограммы вибрирующего тонкого дискового резонатора из пьезокерамики при асимметричном нагружении точечной массой

2019 ◽  
Vol 89 (4) ◽  
pp. 603
Author(s):  
В.А. Титов
Keyword(s):  
Holographic Interferometry ◽  
High Intensity ◽  
Single Mode ◽  
Thin Disk ◽  
Point Mass ◽  
Radial Coordinate ◽  
Experimental Conditions ◽  
Electric Excitation ◽  
Energy Interaction ◽  
Piston Mode

AbstractDeformations of the base of a free piezoceramic resonator that represents a thin disk are visualized using holographic interferometry under high-intensity electric excitation at antiresonance frequencies of radial modes. Motion of a loading point mass along the radial coordinate is used to specify identification of partial modes and the total number and energy interaction of such modes. Four topologically compatible modes form a single mode on which the pattern of Lamb modes is superimposed under certain experimental conditions, and an implicit piston mode is obtained.

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