scholarly journals High-frequency impact stress-wave method for non-destructive test system to detecting penetration of boulders.

2001 ◽  
pp. 141-153 ◽  
Author(s):  
Takahisa SHIOTSUKI ◽  
Jian-Sheng SUN ◽  
Kohei FURUKAWA
Keyword(s):  
Stress Wave ◽  
High Frequency ◽  
Test System ◽  
Wave Method ◽  
Destructive Test ◽  
Impact Stress ◽  
Non Destructive ◽  
Impact Stress Wave

Theoretical Analysis of Non-Destructive Integrity Test in the Pile with Cap Based on Low Strain Reflected Wave Method

2013 ◽  
Vol 427-429 ◽  
pp. 1447-1451
Author(s):  
Pei Ge Liu ◽  
Ran Zhao ◽  
Zong Quan Ying ◽  
Lin Wang Su
Keyword(s):  
Theoretical Analysis ◽  
Stress Wave ◽  
Field Testing ◽  
Wave Method ◽  
Propagation Characteristics ◽  
Integrity Test ◽  
Time Curve ◽  
Reflected Wave ◽  
Non Destructive ◽  
Test Result

This paper analyzes the propagation characteristics of stress wave in the cap-pile system. Based on reflected wave method, the propagation velocity-time curve of stress wave in the defective pile with cap is calculated theoretically. Then the calculation result shows that the waveform curve by theoretical analysis is consistent with the defect location and pile position, and the waveform curve well reflects the propagation characteristics of waves in the pipe with cap. Finally the theoretical analysis method is used to assist the field testing, and compared with the test result to describe the integrity status of pile.

THE REDUCTION OF STRESS WAVE PROPAGATION THROUGH POROUS MATERIALS

2008 ◽  
Vol 22 (09n11) ◽  
pp. 1215-1220
Author(s):  
SOTO AKI KIDA ◽  
KEITA FUKUSHIMA ◽  
MASAYA MATSUMOTO
Keyword(s):  
Porous Medium ◽  
Porous Materials ◽  
Stress Wave ◽  
Acrylic Resin ◽  
Wave Theory ◽  
Stress Waves ◽  
Stress Wave Propagation ◽  
Impact Stress ◽  
The Impact ◽  
Impact Stress Wave

Impact stress wave propagating through porous materials is investigated in order to examine the ability of the shock absorbing effect. The specimens are modeled as the porous medium with different porous diameters made of the acrylic resin plate. When these models are impacted with different impact velocities, the impact stress waves propagating before and after the porous parts are measured using the strain gages in the experiments. As the reduction effect of the impact stress wave propagating in the porous medium, we pay attention to the maximum stresses and the duration times from the histories of the impact stress waves. One-dimensional wave theory and dynamic element method simulated this model are applied in order to explain these phenomena.

scholarly journals Fracture mechanism of air percussive rotary bit matrix based on impact stress wave theory

2017 ◽  
Vol 19 (5) ◽  
pp. 3129-3150 ◽  
Author(s):  
Yachao Ma ◽  
Zhiqiang Huang ◽  
Chengsong Qiu ◽  
Qin Li
Keyword(s):  
Stress Wave ◽  
Fracture Mechanism ◽  
Wave Theory ◽  
Impact Stress ◽  
Impact Stress Wave

scholarly journals Reduction Effect of Impact Stress Wave Propagating in Porous Medium.

1992 ◽  
Vol 58 (551) ◽  
pp. 1055-1059
Author(s):  
Juhachi ODA ◽  
Jirou SAKAMOTO ◽  
Sotoaki KIDA ◽  
Hiroyuki KAKISHIMA
Keyword(s):  
Porous Medium ◽  
Stress Wave ◽  
Impact Stress ◽  
Reduction Effect ◽  
Impact Stress Wave

Real Ear Sound Pressure Levels Developed by Three Portable Stereo System Earphones

1992 ◽  
Vol 1 (4) ◽  
pp. 52-55 ◽  
Author(s):  
Gail L. MacLean ◽  
Andrew Stuart ◽  
Robert Stenstrom
Keyword(s):  
High Frequency ◽  
Sound Pressure ◽  
Low Frequency ◽  
Test System ◽  
Output Frequency ◽  
Frequency Effects ◽  
Adult Men ◽  
Frequency Responses ◽  
Significant Difference ◽  
Sound Pressure Levels

Differences in real ear sound pressure levels (SPLs) with three portable stereo system (PSS) earphones (supraaural [Sony Model MDR-44], semiaural [Sony Model MDR-A15L], and insert [Sony Model MDR-E225]) were investigated. Twelve adult men served as subjects. Frequency response, high frequency average (HFA) output, peak output, peak output frequency, and overall RMS output for each PSS earphone were obtained with a probe tube microphone system (Fonix 6500 Hearing Aid Test System). Results indicated a significant difference in mean RMS outputs with nonsignificant differences in mean HFA outputs, peak outputs, and peak output frequencies among PSS earphones. Differences in mean overall RMS outputs were attributed to differences in low-frequency effects that were observed among the frequency responses of the three PSS earphones. It is suggested that one cannot assume equivalent real ear SPLs, with equivalent inputs, among different styles of PSS earphones.

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