scholarly journals Chladni Figures in Modal Analysis of a Double-Panel Structure

Sensors ◽  
2020 ◽  
Vol 20 (15) ◽  
pp. 4084
Author(s):  
Jaroslaw Rzepecki ◽  
Anna Chraponska ◽  
Sebastian Budzan ◽  
Chukwuemeke William Isaac ◽  
Krzysztof Mazur ◽  
...  
Keyword(s):  
Quality Assurance ◽  
Modal Analysis ◽  
Vibration Reduction ◽  
The Other ◽  
Structural Vibration ◽  
Laser Doppler Vibrometry ◽  
Scanning Time ◽  
Rigid Frame ◽  
Noise And Vibration Reduction ◽  
Chladni Figures

Analysis of the structural vibration, under the sound excitation is an important part of the quality assurance during the design process of devices. One of the most commonly used method is Laser Doppler Vibrometry (LDV). However, under the rapid fluctuations of temperature, structural resonances are shifted into the other frequencies. In such situation LDV method may be inconvenient, due to the scanning time. In this paper the authors proposed Chladni figures to modal analysis of the double-panel structure, excited by the loudspeaker enclosed inside the casing with a rigid frame. Double-panel structure has been proven to be particularly useful for noise and vibration reduction applications. Vision images, obtained during the experiments are converted to binary patterns, using GLCM matrix, and compared with simulations performed in ANSYS.

scholarly journals EXPERIENCE OF ESTIMATION AND REDUCTION OF NOISE AND VIBRATION OF INDUSTRIAL ENTERPRISES OF RUSSIA

Akustika ◽  
2019 ◽  
Vol 32 ◽  
pp. 247-250 ◽  
Author(s):  
Andrey Vasilyev ◽  
Vladimir Sannikov ◽  
Natalia Tyurina
Keyword(s):  
Vibration Reduction ◽  
The Other ◽  
Joint Stock Company ◽  
Operating Characteristics ◽  
Noise Levels ◽  
Stock Company ◽  
Good Efficiency ◽  
Noise And Vibration ◽  
Industrial Enterprises ◽  
Noise And Vibration Reduction

Industrial noise and vibration leads to the workers disease, fatigue breakdown of pipeline and apparatus junction, decreasing of machine operating characteristics etc. According to statistics, amblyacousia and vibration illness takes the first places among all the other professional diseases. Investigations of noise and vibration levels at the operator's positions of "Volgoelectromontazh-1" Joint Stock Company of Russian Federation were done. Measurements were carried out according to existing methods and standards. In total 27 operator's positions were investigated in the main building and in the shop of consumer goods. The results of measurements showed, that for some positions (pendulum saw, cutting-off lathe, presses etc.) there were significant excesses of the sanitary standards of noise levels. Complex of measures of noise reduction was developed, including technical decisions and organizing measures. Results of measures implementation shows good efficiency of noise and vibration reduction.

Vibration Analysis for NDE of Ceramic Components

2021 ◽  
Author(s):  
Bernd Köhler ◽  
Kilian Tschöke ◽  
Mareike Stephan ◽  
Sergey Gartsev ◽  
Martin Barth
Keyword(s):  
Modal Analysis ◽  
Simultaneous Measurement ◽  
Vibration Analysis ◽  
Microphone Array ◽  
Acoustic Measurements ◽  
Laser Doppler Vibrometry ◽  
Mode Identification ◽  
Vibration Excitation ◽  
Ceramic Components ◽  
Signal Evaluation

Abstract In this contribution we study vibration testing for ceramic parts on the example of an electrolyte cup, used in a prospective power cells design. An adapted experimental arrangement for the vibration excitation and the acoustic measurements was built and tested. In parallel, extensive numerical modal analysis simulations were performed using ANSYS. The resonance spectra obtained by modelling agree with the experimentally determined spectra in such a way that the experimentally determined eigenfrequencies can be assigned to the cup modes. The correctness of this identification was verified by direct mode visualization with scanning laser doppler vibrometry. A much faster and potentially in-line capable method for experimental mode identification is the simultaneous measurement at several points using a microphone array and subsequent signal evaluation with operational modal analysis. This procedure was successfully tested. Features in the spectra connected with the presence of flaws are discussed. These features include the drop of some eigenfrequencies and the splitting of degenerated modes.

CDIO Standards and Quality Assurance

2012 ◽  
Vol 2 (2) ◽  
pp. 1-8 ◽  
Author(s):  
Peter J. Gray
Keyword(s):  
Quality Assurance ◽  
Engineering Education ◽  
Case Studies ◽  
The Other ◽  
Special Issue ◽  
Self Evaluation ◽  
The World ◽  
External Stakeholders ◽  
Certification And Accreditation

With Conceive-Design-Implement-Operate (CDIO) approach collaborating institutions and programs in many countries and regions of the world, it is essential that the International CDIO Leadership Council promulgate processes to assure internal and external stakeholders that member institutions and programs are adhering to the 12 CDIO Standards. The Standards are what make CDIO a unique initiative in that they provide a vehicle for realizing the CDIO vision to transform the culture of engineering education. Therefore, the CDIO Council has developed five quality assurance processes that begin with the application to become a CDIO Collaborator and include self-evaluation, certification, and accreditation based on the CDIO Standards. This article discusses the CDIO quality assurance processes and the other articles in this special issue provide case studies and other examples related to the use of the processes by CDIO collaborators.

scholarly journals Modal Analysis of the Structural Vibration of an Oil-hydraulic Pump.

1996 ◽  
Vol 27 (2) ◽  
pp. 315-327 ◽  
Author(s):  
Eiichi KOJIMA ◽  
Hirokazu IWATA ◽  
Norikazu HYODO ◽  
Shinji MATSUSHIMA ◽  
Kakuei WATANABE
Keyword(s):  
Modal Analysis ◽  
Structural Vibration ◽  
Hydraulic Pump
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