scholarly journals Influence of Axial Loads to Propagation Characteristics of the Elastic Wave in a Non-Uniform Shaft

2019 ◽  
Vol 32 (1) ◽  
Author(s):  
Yimin Wei ◽  
Zhiwei Zhao ◽  
Wenhua Chen ◽  
Qi Liu
Keyword(s):  
Elastic Wave ◽  
Propagation Characteristics ◽  
Axial Loads

Propagation Characteristics of Substrate for Lamb-Wave-Type Elastic Wave Devices

2009 ◽  
Vol 48 (7) ◽  
pp. 07GF02
Author(s):  
Hitoshi Yoshida ◽  
Yasuhiko Nakagawa ◽  
Shoji Kakio
Keyword(s):  
Elastic Wave ◽  
Lamb Wave ◽  
Propagation Characteristics ◽  
Wave Type

scholarly journals The Influence of Crack Modes on the Elastic Wave Propagation Characteristics in a Non-uniform Rotating Shaft

2018 ◽  
Author(s):  
Yimin Wei ◽  
Xuan Shi ◽  
Qi Liu ◽  
Wenhua Chen
Keyword(s):  
Elastic Wave ◽  
Elastic Waves ◽  
Transverse Crack ◽  
Propagation Characteristics ◽  
Mode Iii ◽  
Transverse Cracks ◽  
Rotating Shaft ◽  
Rotating Speed ◽  
Local Flexibility ◽  
The Media

The vibration propagates in a media such as a shaft in the form of elastic waves. The propagation characteristics of the waves are affected by the geometry of the media, the material properties as well as the cracks. The study to elastic waves propagating in a shaft with transverse cracks can help to detect them. The transverse crack possesses different crack modes due to different external loads. The influence of the crack mode, the location and the depth to the propagation characteristics is investigated in this paper. Firstly, the local flexibility coefficients with three different modes are deduced. And then, the transfer matrix of the elastic wave can be obtained. Finally, the influence of the crack mode, the location and the depth of the transverse crack as well as the rotating speed to the propagation characteristics is then studied, both in a numerical and an experimental way. It’s found that mode III is the most suitable mode in this paper, the location of the crack will make the stopbands fluctuating, the depth mainly affects the bandwidth of the stopbands, and the increase of the rotating speed will shift up the stopbands without changing their bandwidths.

Assessment on speed and amplitude of elastic wave propagation in square-packed circular honeycombs

2020 ◽  
Vol 56 (1) ◽  
pp. 18-28
Author(s):  
He-Xiang Wu ◽  
Xin-Chun Zhang ◽  
Ying Liu
Keyword(s):  
Wave Propagation ◽  
Elastic Wave ◽  
Structural Parameters ◽  
Propagation Speed ◽  
Development Trend ◽  
Elastic Wave Propagation ◽  
Theoretical Expression ◽  
Chain Model ◽  
Propagation Characteristics ◽  
Wave Propagation Speed

In contrast to the dynamic response characteristics, few propagation characteristics of elastic waves have been described on cellular materials, to date. In view of the development trend of emerging metamaterials on multi-functional, detailed characterization of elastic wave in honeycombs becomes an important task in order to assess their performances. This study investigates the propagation characteristics of elastic wave in square-packed circular honeycombs through combining theoretical analysis and numerical simulation. We also establish a one-dimensional circular chain model to discuss the influence mechanism of impact velocities, material parameters, and structural parameters on the elastic wave propagation characteristics in square-packed circular honeycombs. The influence relations are quantified and a semi-empirical theoretical expression for assessing characterization is presented, which extends theory of elastic wave propagation speed from solid materials to square-packed circular honeycombs. The assessment equation fully describes the elastic wave propagation speed and stress amplitude variation with location during propagation in square-packed circular honeycombs, and the results are consistent with the experimental data from the literature. The findings herein are aimed at providing an assessment equation with simple form for engineering applications easily and providing theoretical basis for elastic wave control and multi-functional combination design of metamaterials.

The directional propagation characteristics of elastic wave in two-dimensional thin plate phononic crystals

2007 ◽  
Vol 364 (3-4) ◽  
pp. 323-328 ◽  
Author(s):  
Jihong Wen ◽  
Dianlong Yu ◽  
Gang Wang ◽  
Honggang Zhao ◽  
Yaozong Liu ◽  
...  
Keyword(s):  
Elastic Wave ◽  
Thin Plate ◽  
Phononic Crystals ◽  
Two Dimensional ◽  
Propagation Characteristics

scholarly journals The Influence of Crack Modes on the Elastic Wave Propagation Characteristics in a Non-Uniform Rotating Shaft

2018 ◽  
Vol 8 (11) ◽  
pp. 2105 ◽  
Author(s):  
Yimin Wei ◽  
Xuan Shi ◽  
Qi Liu ◽  
Wenhua Chen
Keyword(s):  
Wave Propagation ◽  
Elastic Wave ◽  
Transfer Matrix ◽  
Elastic Waves ◽  
Transverse Crack ◽  
Propagation Characteristics ◽  
Mode Iii ◽  
Rotating Shaft ◽  
Rotating Speed ◽  
Local Flexibility

The transverse crack in a non-uniform shaft possesses different crack modes, and it can affect the propagation characteristics of the elastic waves in the shaft. The influence of the crack mode as well as the location and the depth of the crack and the rotating speed to the propagation characteristics is investigated in this paper. Firstly, the transfer matrix for the elastic wave in a non-uniform shaft is obtained by deducing the local flexibility coefficients of the three typical crack modes, in which the transverse crack is modeled as a local spring. After that, the influence of the crack mode to the propagation characteristics is studied both in a numerical and an experimental way. Finally, the influence of the location and the depth of the transverse crack as well as the rotating speed of the shaft is studied too. It is found that Mode III is the most suitable mode in this paper, the location of the crack will make the stopbands fluctuating, the depth mainly affects the bandwidth of the stopbands, and the increase of the rotating speed will shift up the stopbands without changing the bandwidths. The results can help to detect and locate a transverse crack.

A Signal Processing Approach for Elastic Wave-Based Structural Health Monitoring Using Active Piezoelectrics

2007 ◽  
Vol 334-335 ◽  
pp. 1141-1144
Author(s):  
Chun Hui Yang ◽  
Zhong Qing Su ◽  
Lin Ye ◽  
Li Min Zhou ◽  
Peter D. Hodgson
Keyword(s):  
Signal Processing ◽  
Structural Health Monitoring ◽  
Elastic Wave ◽  
Cross Section ◽  
Health Monitoring ◽  
Measurement Accuracy ◽  
Spectrographic Analysis ◽  
Propagation Characteristics ◽  
Digital Frequency ◽  
Complex Boundary

A series of digital frequency filters (DFFs) were designed to screen diverse noises and the spectrographic analysis was conducted to isolate complex boundary reflection, which obscures the damage-induced signals. The scale-averaged wavelet power (SAP) technique was applied to enhance the measurement accuracy of Time of Flight (TOF). As an example, the propagation characteristics of elastic wave in a structural beam of square cross-section were analyzed using such an approach and verified experimentally and numerically, with the consideration of the complicated wave scatter caused by the non-ignorable section dimensions.

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