Design and Development of Vibration Isolation Platform with Double Twisted-strands
Date Issued
2012
Date
2012
Author(s)
Zhong, Ya-Lin
Abstract
Precision instruments are extremely sensitive to vibration during their operation. Therefore vibration isolation platforms are developed to isolate the ground vibration induced by the other machines. Besides the vibration isolation function, the vertical vibration isolation platform must simultaneously possesses the bearing function to support the instrument. The horizontal ones is only responsible to the horizontal vibration isolation function. The horizontal vibration isolation platform can be more efficient than the vertical ones.
The aim of this thesis is to develop a vertical vibration platform that can well isolate low-frequency vibration by using the novel concept of double twisted-strands. The double twisted-strands can realize the needed bearing force and possesses a low-stiffness zone. Through parameter adjustment, it can vary the bearing capacity and the position of the low stiffness zone. Based on the mechanical vibration theory, the small stiffness can achieve the low resonant frequency﹐ which is used as passive vibration isolation. For achieving active vibration isolation, a servo position control system is developed to regulate preloading state of the double twisted-strands so that it can also reduce the transmissibility of the frequency range lower than its inherent resonant frequency. Through combination of passive and active vibration isolations, a vibration isolation platform with low resonant frequency of 7 Hz is developed and experimentally verified.
Subjects
Double twisted- strands
Low-frequency
Vibration isolation platform
Zero stiffness
Transmissibility
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
index.html
Size
23.49 KB
Format
HTML
Checksum
(MD5):aabecb90c2be5a22146fa958a7aa31de