Six degrees of freedom vibration isolation with Euler springs

2021 ◽  
Vol 92 (2) ◽  
pp. 025122
Author(s):  
G. L. Leandri ◽  
A. Sunderland ◽  
J. Winterflood ◽  
L. Ju
Keyword(s):  
Degrees Of Freedom ◽  
Vibration Isolation ◽  
Six Degrees Of Freedom

Theory and Method of Dynamic Modeling for Multilayer Vibration Isolation System

2000 ◽  
Author(s):  
Liao Dao-Xun ◽  
Lu Yong-Zhong ◽  
Huang Xiao-Cheng
Keyword(s):  
High Speed ◽  
Degrees Of Freedom ◽  
Vibration Isolation ◽  
Rigid Bodies ◽  
Design Calculation ◽  
Isolation System ◽  
Dry Land ◽  
Vibration Isolation System ◽  
Six Degrees Of Freedom ◽  
Floating Raft

Abstract The multilayer vibration isolation system has been widely applied to isolate vibration in dynamic devices of ships, high-speed vehicles forging hammer and precise instruments. The paper is based on the coordinate transformation of space general motion for mass blocks (rigid bodies) and Lagrangian equation of multilayer vibration isolation system. It gives a strict mathematical derivation on the differential equation of the motion for the system with six degrees of freedom of relative motion between mass blocks (including base). The equations are different from the same kind of equations in the reference literatures. It can be used in the floating raft of ships in order to isolates vibration and decrease noise, also used in design calculation of the multilayer vibration isolation for dynamic machines and precise instruments on the dry land.

Maglev 6-DOF Stage for Nanopositioning

2003 ◽  
Author(s):  
Wong-Jong Kim ◽  
Shobhit Verma ◽  
Jie Gu
Keyword(s):  
Degrees Of Freedom ◽  
Vibration Isolation ◽  
Mechanical Design ◽  
Wear Particle ◽  
Test Results ◽  
Mechanical Contact ◽  
Position Resolution ◽  
Nanoscale Structures ◽  
Particle Generation ◽  
Six Degrees Of Freedom

This paper presents a novel magnetically levitated (maglev) stage with nanoscale positioning capability in all six degrees of freedom (DOFs). The key aspect of this device is that its single moving part has no mechanical contact with its stationary base, which leads to no mechanical friction and stiction, and no wear particle generation. We present herein the mechanical design, instrumentation, and test results of this maglev stage. Currently it shows position resolution of 4 nm, position noise of 2 nm rms, hundreds-of-micrometer translational travel range, a-few-milliradian rotational travel range, and power consumption less than a fraction of a Watt per axis. This maglev stage can be used in numerous applications such as manufacture of nanoscale structures, assembly and packaging on micro-size parts, vibration isolation for delicate instrumentation, and telepresence microsurgery.

Development of Six Degrees of Freedom Vibration Isolation System for Microgravity Environment

1995 ◽  
Author(s):  
Toshiyuki Suzuki ◽  
Koji Tanida ◽  
Akira Tanji ◽  
Koichi Okubo
Keyword(s):  
Degrees Of Freedom ◽  
Vibration Isolation ◽  
Parabolic Flight ◽  
Microgravity Environment ◽  
External Disturbances ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Six Degrees Of Freedom ◽  
Active Vibration ◽  
Good Agreement

Abstract An active vibration isolation system, under development for use in microgravity environment, provides electromagnetic suspension by means of voice coils arranged in pairs to control the translational and rotational movements of the payload, three pairs of which cover the three axes to ensure control of payload movement in all six degrees of freedom. A series of tests performed on this system in microgravity environment created by parabolic flight proved that external disturbances in frequencies above 0.1 Hz were effectively reduced by applying the system. Also, good agreement was obtained between the measured performance and results of numerical simulation.

A Six Degrees-of-Freedom Vibration Isolation Platform Supported by a Hexapod of Quasi-Zero-Stiffness Struts

2017 ◽  
Vol 139 (3) ◽  
Author(s):  
Jiaxi Zhou ◽  
Kai Wang ◽  
Daolin Xu ◽  
Huajiang Ouyang ◽  
Yingli Li
Keyword(s):  
Degrees Of Freedom ◽  
Vibration Isolation ◽  
Permanent Magnets ◽  
Low Frequency ◽  
Harmonic Balance Method ◽  
Dynamic Responses ◽  
Six Degrees Of Freedom ◽  
Low Frequency Vibration ◽  
Force Moment ◽  
Vibration Isolation Performance

A platform supported by a hexapod of quasi-zero-stiffness (QZS) struts is proposed to provide a solution for low-frequency vibration isolation in six degrees-of-freedom (6DOFs). The QZS strut is developed by combining a pair of mutually repelling permanent magnets in parallel connection with a coil spring. Dynamic analysis of the 6DOFs QZS platform is carried out to obtain dynamic responses by using the harmonic balance method, and the vibration isolation performance in each DOF is evaluated in terms of force/moment transmissibility, which indicates that the QZS platform perform a good function of low-frequency vibration isolation within broad bandwidth, and has notable advantages over its linear counterpart in all 6DOFs.

Maglev Linear Actuator for Nanopositioning

2002 ◽  
Author(s):  
Won-jong Kim ◽  
Himanshu Maheshwari ◽  
Jie Gu
Keyword(s):  
Degrees Of Freedom ◽  
Vibration Isolation ◽  
Force Feedback ◽  
Linear Actuator ◽  
Test Results ◽  
Loop Control ◽  
Nanoscale Structures ◽  
Six Degrees Of Freedom ◽  
Positioning Device ◽  
Disturbance Analysis

Manufacture of nanoscale structures and atomic-level manipulation is an emerging technology field in the 21st century [1,2]. This paper presents a novel magnetically levitated instrument capable of six-degrees-of-freedom (6-DOF) motion with a single moving part. The applications, where this generic positioning device can be used, are manufacturing of nanoscale structures, assembly and packaging of microparts, vibration isolation for delicate instrumentation and motion/force feedback in telepresence surgery. The key element of this stage is a linear actuator capable of providing forces in both suspension and translation without contact. The total range of motion for the linear actuator is ±250 μm. In this paper, we present the closed-loop control test results and stochastic noise/disturbance analysis and prediction for the linear actuator.

Harnessing the compressed-spring mechanism for a six-degrees-of-freedom quasi-zero-stiffness vibration isolation platform

2020 ◽  
pp. 107754632094839
Author(s):  
Yisheng Zheng ◽  
Xinong Zhang ◽  
Yajun Luo ◽  
Shilin Xie ◽  
Yahong Zhang
Keyword(s):  
Degrees Of Freedom ◽  
Vibration Isolation ◽  
Static Load ◽  
Cross Coupling ◽  
Negative Stiffness ◽  
Frequency Range ◽  
Coupling Effects ◽  
Six Degrees Of Freedom ◽  
Spring Mechanism ◽  
Reliable Mechanism

The compressed-spring structure is a simple and reliable mechanism to achieve negative stiffness, which has been vastly investigated for achieving quasi-zero-stiffness isolation. However, six-degrees-of-freedom quasi-zero-stiffness isolators based on this kind of negative-stiffness mechanism still have not been touched. In this study, we propose a six-degrees-of-freedom quasi-zero-stiffness isolation platform constructed by six modules that use compressed-spring structures. Its underlying quasi-zero-stiffness principles in the translational and torsional directions are explained. By establishing the static model of the platform and linearizing it at the static equilibrium position, we find that the linear cross-coupling effects appear if the static load exists. Linearized dynamic analysis of the isolation platform is then performed and the results demonstrate that by applying spring compression, the isolation frequency band can be expanded to lower frequency range in six directions. Because of cross-coupling effects resulted from the static load, the platform cannot achieve whole-frequency-range isolation in the coupling directions even if the spring compressions satisfy quasi-zero-stiffness conditions.

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