Abstract:
:In the present work a general model of the vibrational behavior of the axle of a piezoelectric motor is proposed. In this motor, a cylinder-shaped permanent magnet, which act as a rotor, is pressed in contact with an end of a steel axle by means of the magnetic forces. The other end of the axle is fitted at the center of a rotating traveling wave generator. A piezoelectric membrane, vibrating in a flexural anti-symmetrical mode, or a thick disk, vibrating in a radial anti-symmetrical mode, can be exploited as traveling wave generators. In the first case a bending moment, in the second case a transverse force is applied to the axle. In both cases, if the driving frequency coincides with a resonance frequency of the axle, the axle acts as a resonant displacement amplifier; a continuous slipping takes place between the axle and the rotor, and a torque is transmitted to the rotor. The proposed model is able to describe the axle vibrational behavior when it is excited by a bending moment, by a transverse force, and also when these two excitations are simultaneously applied. The axle is modeled as a four-port system and all its transfer functions, as well as the transversal displacement along the axle at each frequency can be easily computed. Computed results have been compared with experimental measurements carried out on two motor prototypes that exploit as traveling wave generators a membrane and a disk, respectively. A good agreement was obtained by properly taking into account the loading effect of the generator on the axle.
journal_name
Ultrasonicsjournal_title
Ultrasonicsauthors
Iula A,Pappalardo Mdoi
10.1016/j.ultras.2004.01.080subject
Has Abstractpub_date
2004-04-01 00:00:00pages
291-6issue
1-9eissn
0041-624Xissn
1874-9968pii
S0041624X04000319journal_volume
42pub_type
杂志文章相关文献
ULTRASONICS文献大全abstract::Measurements of elastic constants of the austenite phase when approaching the phase transformation either upon cooling or stressing is of the crucial interest for the shape memory alloy field. Acoustic properties (wave velocity and also attenuation changes) of the Cu-Al-Ni single crystal were investigated in situ duri...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2004.01.029
更新日期:2004-04-01 00:00:00
abstract::Ultrasonic reflection and transmission measurements on saturated, plane-parallel, poroelastic slabs are presented. A data processing technique is proposed to obtain poroelastic parameters from transmission measurements. A special experimental data acquisition and processing technique is applied to minimize the finite ...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2008.10.006
更新日期:2009-03-01 00:00:00
abstract::An ultrasonic probe consisting of two optical fiber-based miniaturized transducers for wideband ultrasound emission and detection is employed for the characterization of in vitro biological tissues. In the probe, ultrasound generation is obtained by thermoelastic emission from patterned carbon films in Micro-Opto-Mech...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2016.11.024
更新日期:2017-03-01 00:00:00
abstract::To eliminate the limitations of the conventional sound field separation methods which are only applicable to regular surfaces, a sound field separation method based on combined integral equations is proposed to separate sound fields directly in the spatial domain. In virtue of the Helmholtz integral equations for the ...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2014.06.007
更新日期:2014-12-01 00:00:00
abstract::In medical ultrasound imaging, dynamic range (DR) is defined as the difference between the maximum and minimum values of the displayed signal to display and it is one of the most essential parameters that determine its image quality. Typically, DR is given with a fixed value and adjusted manually by operators, which l...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2014.09.012
更新日期:2015-02-01 00:00:00
abstract::This paper presents a system that accurately measures the distance travelled by ultrasound waves through the air. The simple design of the system and its obtained accuracy provide a tool for non-contact distance measurements required in the laser's optical system that investigates the surface of the eyeball. ...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2011.05.011
更新日期:2011-12-01 00:00:00
abstract::In most applications of MEMS the mechanical properties of the used materials are key parameters for the perfect working of the microsystems. Measuring bulk acoustic waves excited in MEMS structures with ultra-short laser pulses is a powerful method for the accurate and non-destructive evaluation as well as for the cha...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2004.01.049
更新日期:2004-04-01 00:00:00
abstract::Although, high resolution, real-time ultrasonic (US) imaging is routinely available, image interpretation is based on grey-level and texture and quantitative evaluation is limited. Other potentially useful diagnostic information from US echoes may include modifications in tissue acoustic parameters (speed, attenuation...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2004.09.002
更新日期:2005-03-01 00:00:00
abstract::A laser-based technique for the contact-free generation and detection of strongly nonlinear surface acoustic wave (SAW) pulses with amplitudes limited by the materials strength has been developed. The effects of nonlinear propagation of short elastic surface pulses with finite strength in isotropic solids, such as fus...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2008.06.002
更新日期:2008-11-01 00:00:00
abstract::A circular cylindrical piezoelectric transducer with radial polarization is proposed. The axial vibration characteristics of the transducer are studied by three different methods: analytical calculation, FEM simulation and experiment. The symmetric and asymmetric excitation conditions are discussed in the Haskins and ...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2009.09.008
更新日期:2010-03-01 00:00:00
abstract::This paper describes fabrication and comparison of PMN-PT single crystal, PZT, and PZT-based 1-3 composite ultrasonic transducers for NDE applications. As a front matching layer between test material (Austenite stainless steel, SUS316) and piezoelectric materials, alumina ceramics was selected. The appropriate acousti...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2010.04.001
更新日期:2010-08-01 00:00:00
abstract::Ultrasonic studies of the group of halogens of benzene and particularly dependence of acoustic parameters on the structure of organic liquids, demonstrate some interesting regularities in the group of these compounds in gas and liquid states. In this paper results for five cyclic liquids: bromo-, chloro-, fluoro- and ...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2006.05.146
更新日期:2006-12-22 00:00:00
abstract::Ultrasound wave propagation in nanofluids and its rheological behavior has been studied as a function of solid volume fraction, temperature and magnetic field for magnetic nanofluids synthesized in kerosene and transformer oil. Ultrasonic velocity decreases while viscosity increases with increasing volume fraction. Th...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2014.08.017
更新日期:2015-01-01 00:00:00
abstract::Several experimental studies have demonstrated that ultrasound (US) can accelerate enzymatic fibrinolysis and this effect is further enhanced in the presence of ultrasound contrast agents (UCA). Although UCA have been shown to be safe when administered to ischemic stroke patients, safety information of these agents in...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2007.10.003
更新日期:2008-04-01 00:00:00
abstract::Lactic acid, psychrophilic, and mesophilic bacteria, Escherichia coli, Salmonella spp. and Staphylococcus aureus were enumerated on chicken breasts after treatment with different high intensity ultrasound (frequency 40 kHz, intensity 9.6 W/cm-2) application times (0, 30, and 50 min) and packaging atmospheres (aerobic ...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2018.01.001
更新日期:2020-03-01 00:00:00
abstract::This study investigated the effect of LIPUS on fracture healing when fractures were exposed to ultrasound at three axial distances: z=0 mm, 60 mm, and 130 mm. We applied LIPUS to rat fracture at these three axial distances mimicking the exposure condition of human fractures at different depths under the soft tissue. M...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2013.10.013
更新日期:2014-03-01 00:00:00
abstract::Ultrasonic wave tunneling through seriously mismatched media, such as steel and water, is possible only when the frequency matches the resonance of the steel plate. But it is nearly impossible to realize continuous wave tunneling if the low acoustic impedance media is air because the transducer frequency cannot be mad...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2017.07.018
更新日期:2018-01-01 00:00:00
abstract::In this paper, the development of modified beamforming methods, Filtered Delay Weight Multiply and Sum (F-DwMAS) and Filtered Delay Euclidian-Weighted Multiply and Sum (F-DewMAS), are reported. These methods were investigated on a minimum-redundancy synthetic aperture technique, called as 2 element Receive Synthetic A...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2020.106293
更新日期:2021-02-01 00:00:00
abstract::Chemical mechanical polishing (CMP) is the primary method to realize the global planarization of silicon wafer. In order to improve this process, a novel method which combined megasonic vibration to assist chemical mechanical polishing (MA-CMP) is developed in this paper. A matching layer structure of polishing head w...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2017.04.005
更新日期:2017-09-01 00:00:00
abstract::In this paper, we propose a semi-analytical isogeometric analysis(S-IGA) approach in the twist space to investigate the dispersive properties in helical thread waveguides, which combines the advantages of the spectral approach and IGA. The convergence and accuracy of the proposed method are discussed, by comparing S-I...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2017.06.004
更新日期:2018-02-01 00:00:00
abstract::Diversity of acoustic streaming field in a 2D rectangular chamber with a traveling wave and using water as the acoustic medium is numerically investigated by the finite element method. It is found that the working frequency, the vibration excitation source length, and the distance and phase difference between two sepa...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2014.11.015
更新日期:2015-04-01 00:00:00
abstract::In this paper, an improved touch probe sensor device for higher sensitivity and low contact force is reported. In order to improve the resolution, we have evaluated the sensitivity and fabricated a miniaturized sensor. The sensor transducer was 3 mm long and had higher resonance frequency. The resonance frequency of t...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/s0041-624x(02)00091-4
更新日期:2002-05-01 00:00:00
abstract::This work is concerned with the reconstruction, from measured (synthetic or real) data, of a 2D penetrable fluid-like object of arbitrary cross-section embedded in a fluid of infinite extent and insonified by a plane acoustic wave. Green's theorem is used to provide a domain integral representation of the scattered fi...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/s0041-624x(00)00054-8
更新日期:2001-03-01 00:00:00
abstract::Arterial stiffness has been shown to be a good indicator of arterial wall disease. However, a single parameter is insufficient to describe the complex stress-strain relationship of a multi-component, non-linear tissue such as the aorta. We therefore propose a new approach to measure the stress-strain relationship loca...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2010.01.003
更新日期:2010-06-01 00:00:00
abstract::The film condensation of vapor on a cooled, downward-facing surface is a complex dynamic fluid phenomenon. This paper will describe the theoretical basis, instrumentation approach, and experimental results for a method for ultrasonic monitoring of film condensation. The ultrasound measurement system utilizes a 10 MHz ...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/s0041-624x(99)00214-0
更新日期:2000-03-01 00:00:00
abstract::Guided waves propagating in cylindrical tubes are frequently applied for the characterization of material or geometrical properties of tubes. In a tube, guided waves can propagate in the axial direction and called axial guided waves, or in the circumferential direction called circumferential guided waves. Dispersion s...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2010.11.013
更新日期:2011-05-01 00:00:00
abstract::The natural frequencies and distributions of displacement components for the surface vibrational modes in thin isotropic elastic disks are calculated. In particular, the research is focused on even solutions for low-lying resonant vibrations with large angular wave numbers. Several families of modes are found which ar...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2013.11.002
更新日期:2014-03-01 00:00:00
abstract::We experimentally demonstrate a very large ultrasonic band gap in a one-dimensional phononic crystal. The structure consists of periodic tungsten pillars fixed to a tailored silicon strip with a layer of epoxy. Combining local resonances and Bragg scattering, the gap ranges from 450kHz to 1250kHz, which corresponds to...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2017.03.003
更新日期:2017-07-01 00:00:00
abstract::The objective was to use multiple paths through the slurry to determine the lowest concentration that provided accurate attenuation measurements and to measure the velocity of sound through an effective long path. Ultrasonic attenuation measurements were obtained for slurries of silica (10 microm diameter) in water fo...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2006.05.024
更新日期:2006-12-22 00:00:00
abstract::In this paper, te edge mode variation is studied with three different methods: the reciprocal work method, already used by Torvik [J. Acoust. Soc. Am. 41 (1967) 346] to model this phenomenon, the S-parameter method and a finite element model that are applied for the first time to the study of the edge resonance. Moreo...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/s0041-624x(02)00391-8
更新日期:2003-01-01 00:00:00