scholarly journals Vibration Analysis and Evaluation of Piezoelectric Micromachined Ultrasonic Transducers Using Epitaxial Pb(Zr, Ti)O3 Thin Film

2015 ◽  
Keyword(s):  
Thin Film ◽  
Vibration Analysis ◽  
Ultrasonic Transducers ◽  
Analysis And Evaluation

Vibration Analysis and Evaluation of the Indoor Spiral Steel Stair

2010 ◽  
Vol 163-167 ◽  
pp. 36-43 ◽  
Author(s):  
Bin Zhou ◽  
Xiao Song Ren ◽  
Xi Lin Lu
Keyword(s):  
Vibration Analysis ◽  
Space Structure ◽  
Vertical Acceleration ◽  
Design Code ◽  
Load Model ◽  
Analysis And Evaluation ◽  
Comfort Evaluation ◽  
Practical Project ◽  
Research Achievement ◽  
Site Test

The spiral steel stair is widespread used as indoor stair for its graceful appearance. For the space structure system of the spiral stair, it is necessary to make vibration analysis and comfort evaluation to the stair. The load model of pedestrian and the analysis condition by walking and running in the process of ascending and descending are presented in this paper. Referring to some design code and research achievement of footbridge and floor, the index of comfort evaluation, which are the natural frequency, the peak vertical acceleration and the weighted root-mean-square (r.m.s) acceleration, are put forward in this paper. Finally, the numerical analysis and the vibration site test of a practical project are made and the results of vibration analysis and comfortability evaluation are presented to demonstrate the suggestion by the authors.

A Vibration Analysis and Evaluation System Construction Based on On-Line Inspection

2012 ◽  
Vol 605-607 ◽  
pp. 1164-1167
Author(s):  
Yan Chun Xia
Keyword(s):  
Vibration Analysis ◽  
Evaluation System ◽  
Good Method ◽  
Assessment System ◽  
System Construction ◽  
Total Risk ◽  
Assessment Index ◽  
Important Method ◽  
Analysis And Evaluation ◽  
On Line

Vibration analysis(VA) is a very important method in the industry inspection application. Based on ISO10816, the severity level, certainty rating, the total risk rating matrix and the risk assessment index were proposed in the paper. Based on the testing samplings in a certain company and the assessment system established above, the VA analysis can be conducted and it is a good method for applying the predictive maintenance in the plant.

Polyurea Thin Film Ultrasonic Transducers for Nondestructive Testing and Medical Imaging

2007 ◽  
Vol 54 (10) ◽  
pp. 2165-2174 ◽  
Author(s):  
Marie Nakazawa ◽  
Tsutomu Kosugi ◽  
Hiromi Nagatsuka ◽  
Akihiro Maezawa ◽  
Kentaro Nakamura ◽  
...  
Keyword(s):  
Thin Film ◽  
Medical Imaging ◽  
Nondestructive Testing ◽  
Ultrasonic Transducers

Study on Flow Induced Vibration Analysis and Evaluation for Heat Transfer Tube of Steam Generator

2018 ◽  
Author(s):  
Xuan Huang ◽  
Huan-Huan Qi ◽  
Feng-Chun Cai ◽  
Zhi-Peng Feng ◽  
Shuai Liu
Keyword(s):  
Heat Transfer ◽  
Steam Generator ◽  
Vibration Analysis ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Flow Induced Vibration ◽  
Two Phase ◽  
Heat Transfer Tube ◽  
Analysis And Evaluation ◽  
Transfer Tube

The heat transfer tube of steam generator is an important part of the primary loop boundary, the integrity is crucial to the safe operation of the whole reactor system; the flow induced vibration is one of the main factors leading to the failure of heat transfer tube in steam generator. Both ASME and RG1.20 have made a clear requirement for the analysis and evaluation of the flow induced vibration of steam generator. The flow induced vibration of heat transfer tube in two-phase flow is the difficult and important content in the analysis. In this paper, the finite element model of heat transfer tube is established and the modal analysis is carried out. Then in order to evaluate the influence of two-phase flow in the secondary side and support boundary constraint, the analytical results are compared with the natural frequencies of the heat transfer tube measured in the two-phase flow test. On the basis of accurate simulation of the dynamic characteristics of heat transfer tube in two-phase flow, the paper calculate the turbulent excitation response and the fluidelastic instability ratio aiming at the main mechanism causing the flow induced vibration of heat transfer tube in two-phase flow. Firstly, the modified PSD of turbulent excitation is proposed on the foundation of root mean square displacement amplitude of heat transfer tube measured in two-phase flow test. The calculation result of the amplitude of heat transfer tube with different void fraction can envelope the test result by using the modified PSD as input, and the safety margin is reasonable. Then we also verify whether the analysis conclusion of fluidelastic instability is in agreement with the test. Finally, the analytical technique is applied to the analysis of flow induced vibration of steam generator to verify the design of structure. The paper studies on flow induced vibration analysis and evaluation a heat transfer tube of steam generator in two-phase flow. The analysis program of flow induced vibration on the basis of the test results. The investigation can be used for the risk prediction and evaluation of flow induced vibration of heat transfer tube in two-phase flow, solve the technical difficulties of flow induced vibration analysis in two-phase flow, and provide the technical support for the flow induced vibration analysis of steam generator.

Flexible Thin-Film PZT Ultrasonic Transducers

2018 ◽  
Author(s):  
Tianning Liu ◽  
Jeong Nyeon Kim ◽  
Susan E. Trolier-McKinstry ◽  
Thomas N. Jackson
Keyword(s):  
Thin Film ◽  
Ultrasonic Transducers

High-SPL Air-Coupled Piezoelectric Micromachined Ultrasonic Transducers Based on 36% ScAlN Thin-Film

2019 ◽  
Vol 66 (9) ◽  
pp. 1488-1496 ◽  
Author(s):  
Yuri Kusano ◽  
Itaru Ishii ◽  
Tatsuya Kamiya ◽  
Akihiko Teshigahara ◽  
Guo-Lun Luo ◽  
...  
Keyword(s):  
Thin Film ◽  
Ultrasonic Transducers
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