Considering piezoelectric coupling,the characteristic of frequency dispersion was investigated and the transient SH wave was obtained by means of the reverberation matrix-two dimensional spectrum method in the piezoelectric composite layered structure.
The results show that this method can prepare the density shell for Fe/Co composites with core-shell structure. Being a kind of microwave Absorber, it can improve the dispersion characteristics of the traditional micrometer Fe particles and provide a frequency band width of 7GHz for Absorbing rate above 8dB.
And based on the geometry dispersion characteristics of guided waves through bonding metal bars,the guided waves dispersion phenomena is simulated by a finite element software MSC/NASTRAN and the conclusion is drawn that the leveling phenomena of reflection waveforms exist in the anchoring system.
The integrated equivalent circuit method with step approximation and the equivalent network method are both based on the principle of "circuit", but the dispersion characteristic can only be analyzed by the equivalent network method, however, the dispersion and loss characteristics can be analyzed by the method of this paper.
In this paper,first we analyze the frequency dispersion characteristic of Rayleigh wave and the shortcoming of the traditional method of parameter abstracting. Then we process the real data in the method of the time frequency analysis.
The results from the China-US joint surface wave investigation in 26 sites in Tangshan,China,show that the MAM has the same precision with SASW method in 83% of the 26 sites. The MAM is valid for Rayleigh wave dispersion characteristic testing and has great application potentiality for site S-wave velocity structure detection.
The dispersive characteristics of the Rayleigh waves propagated in a stratified media were analyzed by a time-frequency analysis method,the Reassignment of Smooth Pseudo-Wigner Ville Distribution(RSPWVD). Theoretical simulations and experiments were implemented for the homogeneous half-space and the two-layered half-space.
对分层介质半空间瑞利波的频散特性,用一种时频分析方法——重排的平滑伪魏格纳维尔分布(RSPWVD,Reassign- ment of Smooth Pseudo-Wigner Ville Distribution)进行了分析和研究。
It is difficult to locate defects in planar structural materials in service when both static defect and dynamic damage exist in the same structure. A new and applicable approach of planar locating is presented based on using characteristics of acoustic emission technique and recording real-time wave shape in time domain,combining dispersive characteristics of lamb wave and arrival time of different modes determined by using peak magnitude of Gabor wavelet time-frequency analysis.
It is experimentally shown that the local flow nonuniformity leads to a change in the flow stability features, such as the frequencies of the growing oscillations, their growth rate, and the dispersion characteristics.
A Facility for Probe Measurements of the Dispersion Characteristics of Polycrystalline Ferrite Plates
A facility for probe measurements of the dispersion characteristics of polycrystalline ferrite plates is described.
It is shown that experimental fringe patterns enable the restoration of dispersion characteristics of polycrystalline ferrite plates within a frequency band of 2-7 GHz at magnetizing fields of 2-3.2 kG.
Determination of geometrical parameters of cylindrical bodies using dispersion characteristics of modes of elastic cylindrical w
A model of equivalent reflectors proposed for crystal-like structure makes it possible to obtain the dispersion characteristic in explicit form.
A radio-engineering approach based on the dispersion characteristic and impulse response of a radio channel is proposed to describe the dispersion distortion of complex shortwave radio signals propagating through ionospheric radio channels.
The dispersion characteristic and the transmission response of the proposed LT-TL are analyzed.
Dispersion characteristic and it's application of general transmission line equations on microstrip step structures
Effect of metal cladding on the modal dispersion characteristic of an annular waveguide with the guiding region section bounded
It is found that the mean flow velocity shear leads to a nontrivial modification of the dispersive characteristics of surface gravity wave modes.
Dispersive characteristics of diamond in the range of hard x-ray waves
Particle displacements associated with these waves may be important to the dispersive characteristics of the reef environment.
Using ray-tracing codes, we have analyzed three different setups in which spherical mirrors are employed in conjunction with the transmission grating and have investigated in detail their dispersive characteristics.
Resonant wavenumber mismatch between these interacting modes can arise from the dispersive characteristics of the interacting waves and from spectral broadening due to random effects.