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.

scholarly journals Design and Performance Evaluation of a Single-Phase Driven Ultrasonic Motor Using Bending-Bending Vibrations

Micromachines ◽  
2021 ◽  
Vol 12 (8) ◽  
pp. 853
Author(s):  
Dongmei Xu ◽  
Wenzhong Yang ◽  
Xuhui Zhang ◽  
Simiao Yu
Keyword(s):  
Single Phase ◽  
Oblique Line ◽  
Ultrasonic Motor ◽  
Vibration Modes ◽  
Bending Vibrations ◽  
Bending Vibration ◽  
Output Performance ◽  
Resonance Frequencies ◽  
And Performance ◽  
Line Trajectory

An ultrasonic motor as a kind of smart material drive actuator has potential in robots, aerocraft, medical operations, etc. The size of the ultrasonic motor and complex circuit limits the further application of ultrasonic motors. In this paper, a single-phase driven ultrasonic motor using Bending-Bending vibrations is proposed, which has advantages in structure miniaturization and circuit simplification. Hybrid bending vibration modes were used, which were excited by only single-phase voltage. The working principle based on an oblique line trajectory is illustrated. The working bending vibration modes and resonance frequencies of the bending vibration modes were calculated by the finite element method to verify the feasibility of the proposed ultrasonic motor. Additionally, the output performance was evaluated by experiment. This paper provides a single-phase driven ultrasonic motor using Bending-Bending vibrations, which has advantages in structure miniaturization and circuit simplification.

scholarly journals Numerical Simulation of Heat Transfer Flow Subject to MHD of Williamson Nanofluid with Thermal Radiation

Symmetry ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 10
Author(s):  
Muhammad Amer Qureshi
Keyword(s):  
Heat Transfer ◽  
Differential Equations ◽  
Thermal Radiation ◽  
Single Phase ◽  
Physical Parameters ◽  
Fundamental Symmetry ◽  
Box Scheme ◽  
Mhd Boundary Layer ◽  
Slippery Surface ◽  
Transfer Flow

In this paper, heat transfer and entropy of steady Williamson nanofluid flow based on the fundamental symmetry is studied. The fluid is positioned over a stretched flat surface moving non-uniformly. Nanofluid is analyzed for its flow and thermal transport properties by consigning it to a convectively heated slippery surface. Thermal conductivity is assumed to be varied with temperature impacted by thermal radiation along with axisymmetric magnetohydrodynamics (MHD). Boundary layer approximations lead to partial differential equations, which are transformed into ordinary differential equations in light of a single phase model accounting for Cu-water and TiO2-water nanofluids. The resulting ODEs are solved via a finite difference based Keller box scheme. Various formidable physical parameters affecting fluid movement, difference in temperature, system entropy, skin friction and Nusselt number around the boundary are presented graphically and numerically discussed. It has also been observed that the nanofluid based on Cu-water is identified as a superior thermal conductor rather than TiO2-water based nanofluid.

The Method for Determining the Vibration-Damping Elements for the Mechanical System to Obtain the Desired Amplitude Value

2014 ◽  
Vol 657 ◽  
pp. 644-648 ◽  
Author(s):  
Andrzej Dymarek ◽  
Tomasz Dzitkowski
Keyword(s):  
Mechanical System ◽  
Dynamic Characteristics ◽  
Vibration Reduction ◽  
Mechanical Systems ◽  
Vibration Damping ◽  
Displacement Velocity ◽  
Synthesis Methods ◽  
Resonance Frequencies

The paper presents the use of synthesis methods to determine the parameters of passive vibration reduction in mechanical systems. Passive vibration reduction in a system is enabled by units called dampers whose values are determined on the basis of the method formulated and formalized by the authors. The essence of the method are, established at the beginning of a task, dynamic characteristics in the form of the resonance and anti-resonance frequencies, and amplitudes of displacement, velocity or acceleration of vibration.

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

Internal Friction and Lattice Anomalies of Single-Phase Hg-1223

1997 ◽  
Vol 160 (1) ◽  
pp. 61-65 ◽  
Author(s):  
Q. M. Zhang ◽  
H. M. Shao ◽  
Y. N. Huang ◽  
H. M. Shen ◽  
Y. N. Wang
Keyword(s):  
Internal Friction ◽  
Single Phase

Internal friction and lattice anomalies of single-phase Hg-1 2 2 3

1997 ◽  
Vol 101 (2) ◽  
pp. 133-135 ◽  
Author(s):  
Q.M. Zhang ◽  
H.M. Shao ◽  
Y.N. Huang ◽  
H.M. Shen ◽  
Y.N. Wang
Keyword(s):  
Internal Friction ◽  
Single Phase

A Single-Phase / Three-Phase Transformer Designed for Voltage Detection Unit of 400Hz Converter Excitation Regulator

2014 ◽  
Vol 1006-1007 ◽  
pp. 967-971
Author(s):  
Yang Lv ◽  
Jun Hong Zhang ◽  
Jing Hong Zhao
Keyword(s):  
Single Phase ◽  
Response Speed ◽  
Obvious Effect ◽  
Ac Motor ◽  
Ac Power ◽  
Three Phase ◽  
Detection Circuit ◽  
Excitation Regulator ◽  
Filter Capacitor ◽  
Detection Unit

Design a single-phase / three-phase transformer designed for voltage detection unit of 400Hz frequency ship converter excitation regulator. Transformer has asimilar structure to AC motor, but the rotor is fixed, a single-phase AC power pass into the rotor and three-phase alternating current generated in the stator side. The transformer is used to the detection circuit of voltage regulator , so that the filter capacitor can be reduced, thereby reducing the latency of signal feedback and improve the response speed of the excitation regulator. The experimental results show that, the transformer has obvious effect on improving the response speed of the circuit.

Internal friction mechanism in improper ferroelectric-ferroelastic Gd2(MoO4)3

1983 ◽  
Vol 48 (1) ◽  
pp. 169-173 ◽  
Author(s):  
S. A. Gridnev ◽  
B. M. Darinskii ◽  
B. N. Prasolov
Keyword(s):  
Internal Friction ◽  
Friction Mechanism
Sign in / Sign up

Export Citation Format

Share Document