Dynamic analysis of a dielectric elastomer-based microbeam resonator with large vibration amplitude

2014 ◽  
Vol 65 ◽  
pp. 63-68 ◽  
Author(s):  
C. Feng ◽  
L. Yu ◽  
W. Zhang
Keyword(s):  
Dynamic Analysis ◽  
Vibration Amplitude ◽  
Dielectric Elastomer ◽  
Large Vibration Amplitude

Dynamic analysis of dielectric elastomer actuators

2012 ◽  
Vol 100 (11) ◽  
pp. 112903 ◽  
Author(s):  
Bai-Xiang Xu ◽  
Ralf Mueller ◽  
Anika Theis ◽  
Markus Klassen ◽  
Dietmar Gross
Keyword(s):  
Dynamic Analysis ◽  
Dielectric Elastomer ◽  
Dielectric Elastomer Actuators

Nonlinear Vibration Analysis of a Dielectric Elastomer Based Microbeam Resonator

2016 ◽  
Vol 846 ◽  
pp. 188-192 ◽  
Author(s):  
Chuang Feng ◽  
Jie Yang ◽  
Liao Liang Ke
Keyword(s):  
Resonant Frequency ◽  
Dynamic Characteristics ◽  
Vibration Analysis ◽  
Vibration Amplitude ◽  
Ambient Pressure ◽  
Dielectric Elastomer ◽  
Squeeze Film ◽  
Beam Resonator ◽  
Squeeze Film Damping ◽  
Electrical Voltage

Dynamic characteristics of a dielectric elastomer based micro beam resonator are investigated by taking into consideration of squeeze-film damping, large deformation and electrical voltage. The analysis shows that the resonant frequency of the resonator can be tuned through changing applied electrical voltage. It is observed that the natural frequency of the resonator increases with the increase of the vibration amplitude. In addition, the ambient pressure can significantly alter the resonant frequency of the resonator. The analysis is envisaged to provide qualitative predictions and guidelines for design and application of DE-based micro resonators.

Comparing the Effects of Ultrasonic System of the EDM Process on Machining Cemented Carbide

2019 ◽  
Vol 950 ◽  
pp. 195-199
Author(s):  
Boonsong Chongkolnee ◽  
Chaiya Praneetpongrung
Keyword(s):  
Ultrasonic Vibration ◽  
High Frequency ◽  
Small Amplitude ◽  
Vibration Amplitude ◽  
Low Frequency ◽  
Cemented Carbide ◽  
Tool Electrode ◽  
Vibration Technique ◽  
Machining Properties ◽  
Large Vibration Amplitude

This research aim to improve the machining properties of the EDM for cemented carbide. The new methods were designed and proposed to use the ultrasonic vibration technique. Two types of USEDM systems were produced. One had a low frequency of 29 kHz with a large vibration amplitude, while the other had a high frequency of 59 kHz with a small amplitude. The Cu-W tool electrode was synchronized with the devised vibration system, and several discharge generation conditions were carried out on the cemented carbide material. The results showed that the highest machining efficiencies were obtained from the ultrasonic low frequency of 29 kHz with a large vibration amplitude. The MRR, TWR and surface roughness of the ultrasonic low frequency with the large vibration amplitude were better than the high frequency system with the small amplitude system. It was clarified that the ultrasonic vibration with the large amplitude could assist the material removal behavior of the discharge.

scholarly journals Study On The Vibration Amplitudes Of Reinforced Concrete Bridge Piers Using ABAQUS Software

2021 ◽  
Vol 28 (2) ◽  
pp. 37-45
Author(s):  
Mais Ghassoun ◽  
Ali Algharrash ◽  
Reem Alsehnawi
Keyword(s):  
Dynamic Analysis ◽  
Natural Frequency ◽  
Dynamic Characteristics ◽  
Vibration Amplitude ◽  
Dynamic Properties ◽  
Damping Ratio ◽  
Response Amplitude ◽  
Experimental Results ◽  
Important Indicator ◽  
Design Values

The Dynamic characteristics such as damping ratio and natural frequency are an important indicator for predicting the dynamic behavior of bridges, but it is customary during the design that the designer assess the dynamic properties of the dynamic analysis because it is very difficult to determine the damping of the origin before construction and damping is taken as a predetermined constant value independent of the response amplitude and frequency of the structure. In the dynamic analysis of constructions design some experimental research has been concerned with the determination of dynamic structural properties and their relationship with the response amplitude experimentally, but the changes in dynamic properties with vibration amplitude has never been taken During dynamic analysis, further analytical treatments and computer modeling were required to study different cases based on the experimental results available by simulating them with a computer model. Dynamic characteristics are very essential to accurately determine the dynamic response, and it is necessary to study the effect of changes of the actual dynamic characteristics of bridges, which were determined by measuring their vibration in the results of dynamic analysis and comparing them with results that do not take into account the changes of dynamic properties and with laboratory results in order to assess the role of. Dynamic analysis inputs in simulating vibrations by monitoring their responses. As a result, it was found that the dynamic properties are independent of the shape of the external exactions. Also, it was concluded that relationships express the change of dynamic properties in terms of vibration amplitudes. And Similar reliance of the dynamic characteristics to the vibration amplitude is confirmed for the pier model, where the increase of the amplitude of the acceleration is accompanied by a decrease in the natural frequency, and an increase in the damping ratio is obvious. Before choosing design values when considering the dynamic characteristics of a structure, we need to give unique concentration to the predictable vibration amplitudes. Dynamic characteristics changes during dynamic analysis should be considered to produce analytical results that simulate experimental results and are closer to reality.

scholarly journals Air Damping Analysis of a Micro-Coriolis Mass Flow Sensor

Sensors ◽  
2022 ◽  
Vol 22 (2) ◽  
pp. 673
Author(s):  
Yaxiang Zeng ◽  
Remco Sanders ◽  
Remco J. Wiegerink ◽  
Joost C. Lötters
Keyword(s):  
Mass Flow ◽  
Vibration Amplitude ◽  
Signal To Noise Ratio ◽  
Small Mass ◽  
Flow Sensor ◽  
Atmospheric Environment ◽  
Q Factor ◽  
Theoretical Predictions ◽  
Mass Flow Sensor ◽  
Large Vibration Amplitude

A micro-Coriolis mass flow sensor is a resonating device that measures small mass flows of fluid. A large vibration amplitude is desired as the Coriolis forces due to mass flow and, accordingly, the signal-to-noise ratio, are directly proportional to the vibration amplitude. Therefore, it is important to maximize the quality factor Q so that a large vibration amplitude can be achieved without requiring high actuation voltages and high power consumption. This paper presents an investigation of the Q factor of different devices in different resonant modes. Q factors were measured both at atmospheric pressure and in vacuum. The measurement results are compared with theoretical predictions. In the atmospheric environment, the Q factor increases when the resonance frequency increases. When reducing the pressure from 1 to 0.1 , the Q factor almost doubles. At even lower pressures, the Q factor is inversely proportional to the pressure until intrinsic effects start to dominate, resulting in a maximum Q factor of approximately 7200.

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