Design Method for The Micro Vibration Isolator Using Flux Pinning Effect for Satellites

2016 ◽  
Author(s):  
Takuma Shibata ◽  
Shin-ichiro Sakai
Keyword(s):  
Flux Pinning ◽  
Design Method ◽  
Vibration Isolator ◽  
Pinning Effect ◽  
Micro Vibration

scholarly journals Vibration Test and Shock Absorption of Coal Crusher Chambers in Thermal Power Plants (II): Numerical Analysis

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Hanquan Yuan ◽  
Lihua Zhu ◽  
Haoyi Zhou ◽  
Dong Jiang ◽  
Baoquan Liu ◽  
...  
Keyword(s):  
Power Plants ◽  
Vibration Isolation ◽  
Design Method ◽  
Thermal Power ◽  
Element Model ◽  
Dynamic Coefficient ◽  
Test Results ◽  
Vibration Isolator ◽  
Shock Absorption ◽  
Vibration Displacement

The coal crusher generates large vibrations when crushing coal blocks, which can affect the equipment itself, as well as the safety of the structure. In order to study the dynamic characteristics of coal crusher, a finite element model of the coal crusher chamber in the Shangluo power plant was built by using ABAQUS. Firstly, modal and harmonic response analyses were conducted, and the comparison shows that the numerical results are basically in accordance with the test results. Then, shock absorption research was performed using a parametric analysis that included the stiffness and position of the spring vibration isolator, the mass, and material of the vibration-isolation platform. Finally, the dynamic coefficient of a coal crusher was discussed. The results showed that, compared with the stiffness of the spring vibration isolator, the mass of the vibration-isolation platform had more influence on the vibration displacement of the coal crusher. To achieve better vibration isolation, the concrete platform is suggested, and the eccentricity of the spring vibration isolator should not exceed 5%. When static design method is adopted to calculate the bearing capacity of the supporting structure subjected to the dynamic load of the coal crusher, the dynamic coefficient of a coal crusher is suggested as 1.5.

Design and Experiment of Inerter-Rubber Vibration Isolator Based on Parallel Inerter-Spring-Damper System

2021 ◽  
pp. 1-10
Author(s):  
Huabing Wen ◽  
Wei Liu ◽  
Junhua Guo ◽  
Kun Zhang ◽  
Yang Li ◽  
...  
Keyword(s):  
Vibration Isolation ◽  
Design Method ◽  
Resonant Peak ◽  
Design Parameters ◽  
Vibration Isolator ◽  
Test Bed ◽  
Multi Objective Genetic Algorithm ◽  
Rubber Part ◽  
Practical Engineering ◽  
Engineering Significance

Since an inerter has been widely used in the field of vibration isolation, the combination of the inerter and the rubber part inevitably becomes a trend. In this work, a parallel inerter-spring-damper system (II-ISD) was introduced and analyzed for its performance on vibration isolation. Then, the optimal inertance-mass ratio and the frequency ratio at the minimum transmissibility were obtained. Based on the II-ISD system, an integrated vibration isolator was designed where the rubber part paralleled to the inerter, which was named as the inerter-rubber vibration isolator (IR). Then, its mechanical properties were simulated, and the mathematical model was established by considering the vibration isolation performance and the service life. Afterward, it was optimized by a programmed multi-objective genetic algorithm, and the optimal design parameters of IR were got finally. The experimental prototype of IR was processed, and its performance experiment was performed on the Mechanical Testing System (MTS) test bed. Experimental results show that the theoretical model of IR based on the II-ISD system is accurate; the resonant peak of IR is clearly lower than that of the rubber vibration isolator; the natural frequency decreases obviously. This work provides a design method for the serial product development, which has a practical engineering significance.

Flux pinning effect of small size defects in YBa2Cu3O7−δ

1994 ◽  
Vol 89 (2) ◽  
pp. 93-95 ◽  
Author(s):  
Fang Minghu ◽  
Hu Gangjin ◽  
Cai Meng ◽  
Jiao Zhenkuan ◽  
Zhang Qirui
Keyword(s):  
Flux Pinning ◽  
Pinning Effect
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