scholarly journals Structural Low-Level Dynamic Response Analysis Using Deviations of Idealized Edge Profiles and Video Acceleration Magnification

2019 ◽  
Vol 9 (4) ◽  
pp. 712
Author(s):  
Dashan Zhang ◽  
Liangfei Fang ◽  
Ye Wei ◽  
Jie Guo ◽  
Bo Tian
Keyword(s):  
High Frequency ◽  
Vibration Characteristics ◽  
Response Analysis ◽  
Test Beam ◽  
Structural Dynamic ◽  
Vibration Signals ◽  
High Frequency Vibration ◽  
Low Level ◽  
Beam Experiment ◽  
Noise Barrier

The development of high-speed camera systems and image processing techniques has promoted the use of vision-based methods as a practical alternative for the analysis of non-contact structural dynamic responses. In this study, a deviation extraction method is introduced to obtain deviation signals from structural idealized edge profiles. Given that the deviation temporal variations can reflect the structural vibration characteristics, a method based on singular-value decomposition (SVD) is proposed to extract valuable vibration signals from the matrix composed of deviations from all video frames. However, this method exhibits limitations when handling low-level motions that reflect high-frequency vibration components. Hence, a video acceleration magnification algorithm is employed to enhance low-level deviation variations before the extraction. The enhancement of low-level deviation variations is validated by a light-weight cantilever beam experiment and a noise barrier field test. From the extracted waveforms and their spectrums from the original and magnified videos, subtle deviations of the selected straight-line edge profiles are magnified in the reconstructed videos, and low-level high-frequency vibration signals are successfully enhanced in the final extraction results. Vibration characteristics of the test beam and the noise barrier are then analyzed using signals obtained by the proposed method.

scholarly journals Hinge-type FBG acceleration sensor based on double elastic plate

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Zhongchao Qiu ◽  
Jinquan Zhang ◽  
Yuntian Teng ◽  
Zhitao Gao ◽  
Li Hong
Keyword(s):  
Resonance Frequency ◽  
Elastic Plate ◽  
High Frequency ◽  
Large Scale ◽  
Acceleration Sensor ◽  
Medium Frequency ◽  
Vibration Signals ◽  
High Frequency Vibration ◽  
Large Scale Structures ◽  
Scale Structures

AbstractIt is critical for the health monitoring of large-scale structures such as bridge, railway and tunnel to acquire the medium-frequency and high-frequency vibration signals. To solve the problems of low sensitivity and poor transverse anti-interference of the medium-frequency and high-frequency fiber acceleration sensor, a hinge-type Fiber Bragg Grating(FBG) acceleration sensor based on double elastic plate has been proposed, and the hinge and elastic plate are used as elastomer to realize the miniaturization and transverse interference suppression of the sensor. The MATLAB and the ANSYS are used for theoretical analysis and optimization of sensor sensitivity and resonance frequency, structural static stress analysis and modal simulation analysis, while the test system is built to test the sensor performance. The results show that the resonance frequency of the sensor is 1300 Hz; the sensor has a flat sensitivity response in the middle-high frequency band of 200–800 Hz; the sensitivity is about 20 pm/g, and the fiber central wavelength drift and acceleration have good linearity and stability, while the transverse anti-interference is about 3.16%, which provides a new idea for monitoring of medium-frequency and high-frequency vibration signals in large-scale structures.

Research on Fault Diagnosis of Ship Stern Bearing Based on Vibration Analysis

2010 ◽  
Vol 139-141 ◽  
pp. 2354-2358
Author(s):  
Yong Jin ◽  
Lin Liu Zheng
Keyword(s):  
Fault Diagnosis ◽  
High Frequency ◽  
Vibration Analysis ◽  
Vibration Characteristics ◽  
Vibration Source ◽  
High Frequency Vibration ◽  
Rotary Machine ◽  
Vibration Data ◽  
Analysis Platform ◽  
Diagnostic Mode

The application of vibration analysis in fault diagnosis of rotary machine becomes more and more popular. Aiming at an abnormal high frequency vibration of a stern bearing, this paper proposed a method of fault diagnosis based on the analysis of vibration characteristics and the spectral analysis. From the gathered vibration data of a stern shaft bench through Pulse Vibration Analysis Platform, using the speed spectrum array to determine the characteristics of vibration source, with the analysis of vibration characteristics of the bench, it concluded that the abnormal high frequency vibration source of the stern bearing is a weak rigidity part of bench─ tacho-torque meter. The vibration data of again test after strengthening the part illustrated the validity of this diagnostic mode.

scholarly journals Ada ptations of mouse skeletal muscle to chronic low‐level, high‐frequency vibration

2011 ◽  
Vol 25 (S1) ◽  
Author(s):  
James Nelson McKeehen ◽  
Kristen A Baltgalvis ◽  
Jarrod A Call ◽  
Sarah M Greising ◽  
Susan A Novotny ◽  
...  
Keyword(s):  
Skeletal Muscle ◽  
High Frequency ◽  
High Frequency Vibration ◽  
Mouse Skeletal Muscle ◽  
Low Level

2934 Analysis of High Frequency Vibration Characteristics of Railway Vehicle Seats

2008 ◽  
Vol 2008.7 (0) ◽  
pp. 141-142
Author(s):  
Shigeki FUKUI ◽  
Masao NAGAI ◽  
Yohei MICHITSUJI ◽  
Seiichi WATANABE ◽  
Katsufumi HASHIMOTO ◽  
...  
Keyword(s):  
High Frequency ◽  
Vibration Characteristics ◽  
Railway Vehicle ◽  
High Frequency Vibration

Vibration Characteristics of Air-Entrained Concrete Based on Slipform Construction

2012 ◽  
Vol 204-208 ◽  
pp. 1549-1552
Author(s):  
Yan Cong Zhang ◽  
Ling Ling Gao ◽  
Jun Min Shen
Keyword(s):  
High Frequency ◽  
Viscosity Coefficient ◽  
Vibration Characteristics ◽  
Structural Viscosity ◽  
Comparative Testing ◽  
High Frequency Vibration ◽  
Air Entrained Concrete

Vibration characteristics of air-entrained concrete was analyzed by vibration slump loss, formwork ability and vibration viscosity coefficient through comparative testing. The results showed that: air-entrained concrete has a characteristic that high slump in vibrating and low after. It was significance to construction with slipform paver. Air-entraining agent improved the concrete structural viscosity under high-frequency vibration was the reason for this characteristics.

scholarly journals Hinge-Type FBG Acceleration Sensor Based on Double Elastic Plate

2021 ◽  
Author(s):  
Zhongchao Qiu ◽  
Jinquan Zhang ◽  
Yuntian Teng ◽  
Zhitao Gao ◽  
Hong Li
Keyword(s):  
Resonance Frequency ◽  
Elastic Plate ◽  
High Frequency ◽  
Large Scale ◽  
Acceleration Sensor ◽  
Medium Frequency ◽  
Vibration Signals ◽  
High Frequency Vibration ◽  
Large Scale Structures ◽  
Scale Structures

Abstract It is critical for the health monitoring of large-scale structures such as bridge, railway and tunnel to acquire the medium-frequency and high-frequency vibration signals. To solve the problems of low sensitivity and poor transverse anti-interference of the medium-frequency and high-frequency fiber acceleration sensor, a hinge-type Fiber Bragg Grating(FBG) acceleration sensor based on double elastic plate has been proposed, and the hinge and elastic plate are used as elastomer to realize the miniaturization and transverse interference suppression of the sensor. The MATLAB and the ANSYS are used for theoretical analysis and optimization of sensor sensitivity and resonance frequency, structural static stress analysis and modal simulation analysis, while the test system is built to test the sensor performance. The results show that the resonance frequency of the sensor is 1300 Hz; the sensor has a flat sensitivity response in the middle-high frequency band of 200-800 Hz; the sensitivity is about 20 pm/g, and the fiber central wavelength drift and acceleration have good linearity and stability, while the transverse anti-interference is about 3.16%, which provides a new idea for monitoring of medium-frequency and high-frequency vibration signals in large-scale structures.

scholarly journals Tactile feedback system of high-frequency vibration signals for supporting delicate teleoperation of construction robots

2020 ◽  
Vol 34 (11) ◽  
pp. 730-743 ◽  
Author(s):  
Hikaru Nagano ◽  
Hideto Takenouchi ◽  
Nan Cao ◽  
Masashi Konyo ◽  
Satoshi Tadokoro
Keyword(s):  
High Frequency ◽  
Feedback System ◽  
Tactile Feedback ◽  
Vibration Signals ◽  
High Frequency Vibration
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