Acoustic Noise/Vibration Reduction of a Single-Phase SRM Using Skewed Stator and Rotor

2013 ◽  
Vol 60 (10) ◽  
pp. 4292-4300 ◽  
Author(s):  
Hyong-Yeol Yang ◽  
Young-Cheol Lim ◽  
Hyun-Chul Kim
Keyword(s):  
Single Phase ◽  
Acoustic Noise ◽  
Vibration Reduction ◽  
Noise Vibration

Damping Performance of Material Candidates for Service at 350K

2021 ◽  
Vol 315 ◽  
pp. 43-49
Author(s):  
Si Bin Zhang ◽  
Ze Chao Jiang ◽  
Qing Chao Tian
Keyword(s):  
Internal Friction ◽  
Single Phase ◽  
Vibration Reduction ◽  
Physical Parameters ◽  
Heating Rates ◽  
Friction Mechanism ◽  
Obvious Effect ◽  
Negative Linear Correlation ◽  
Resonance Frequencies ◽  
Damping Materials

Vibration systems require the damping materials operating at high service temperature. In this paper, damping performance of HT100, M2052 and S316L at 350K were evaluated by applying different frequencies, strain amplitudes and heating rates. It is found that the internal friction dependence of frequency of HT100, M2052 and S316L all show a characteristic of Check function, and the resonance frequency has a negative linear correlation with the material physical parameters. The strain amplitude as well as heating rate has no obvious effect on the resonance frequencies of the materials, but significantly enhance the internal friction of the interface damping alloys such as M2052 and HT100, but small on single-phase alloys such as S316L. The internal friction mechanism for HT100 and M2052 are of static hysteresis at 350K, and HT100 and M2052 are applicable candidates for working at temperatures around 350K from the viewpoint of vibration reduction.

Vibration Reduction of MLCCS Using Vibration-Canceling Effects of Poling Process

2016 ◽  
Author(s):  
Dongjoon Kim ◽  
Byung-Han Ko ◽  
No-cheol Park ◽  
Young-Pil Park
Keyword(s):  
Fundamental Frequency ◽  
Opposite Direction ◽  
Piezoelectric Coefficient ◽  
Acoustic Noise ◽  
Vibration Reduction ◽  
Circuit Board ◽  
Poling Process ◽  
Dc Bias ◽  
Poling Voltage ◽  
Piezoelectric Characteristics

MLCC vibrates due to its piezoelectric characteristics and it makes circuit board vibrate and lead to acoustic noise. In order to reduce vibration, piezoelectric coefficient should be reduced. In this study, poling process was used to decrease piezoelectric coefficient. Due to the electrostriction coefficient, response at fundamental frequency can be cancelled by applying voltage to opposite direction. Through the experiment, vibration-cancelling voltage increases as the poling voltage increases. Also, vibration-cancelling voltage increase inversely proportion to MLCC’s capacitance. By applying proper DC bias after poling process, vibration can be reduced.

scholarly journals A Numerical and Experimental Study on an Interconnected Metamaterial for Flexural Vibration Control Based on Modal Strain Energy

2021 ◽  
Vol 11 (10) ◽  
pp. 4530
Author(s):  
Hyun-Guk Kim ◽  
Onyu Jeon ◽  
Semyung Wang
Keyword(s):  
Strain Energy ◽  
Single Phase ◽  
Vibration Reduction ◽  
Flexural Vibration ◽  
Impact Testing ◽  
Response Analysis ◽  
3D Printer ◽  
Frequency Response Analysis ◽  
Modal Strain Energy ◽  
Bloch Mode

In this study, an interconnected metamaterial was proposed to suppress flexural vibration. The interconnected metamaterial can improve the manufacturing and installation processes in terms of convenience because it can be fabricated in the form of a modular multi-celled structure with a single-phase material. To evaluate the vibration reduction performance of the metamaterial, stopband analysis was performed, as it solves an iterative eigenvalue problem for the wave vector domain. In order to identify the Bloch mode that contributes to flexural vibration, a concept to extract the Bloch mode based on the modal strain energy was proposed. The vibration-reduction performance of the interconnected metamaterial was numerically verified by using a frequency-response analysis of the multi-celled structure. The interconnected metamaterial proposed in this study was fabricated by using a 3D printer. Finally, the vibration-reduction performance of the multi-celled structure was experimentally verified by using impact testing.

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