Relevant bibliographies by topics / 6-DOF vibration isolation

Academic literature on the topic '6-DOF vibration isolation'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "6-DOF vibration isolation"

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Zhang, Yang, Weiwei Fu, and Lijun Wang. "Modeling analysis of a novel hybrid 6-DOF vibration isolation platform for sensitive instruments." Journal of Physics: Conference Series 2383, no. 1 (December 1, 2022): 012146. http://dx.doi.org/10.1088/1742-6596/2383/1/012146.

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The inevitable vibration caused by normal operation of the spacecraft in orbit will interfere sensitive instruments, such as space telescope, reconnaissance camera, space interferometer. Serious vibrations affect the accuracy and reliability of the sensitive instruments, even cause flight mission failed. This paper presents a hybrid 6-DOF vibration isolation platform (HVIP) with six degree-of-freedom for active vibration isolation of the space sensitive instruments. The HVIP is composed of three orthogonal vibration isolation module, which composed of the active piezoelectric actuator and passive rubber isolator. The dynamic model of the HVIP is established based Lagrange equation approach. Finally, the numerical simulations are performed to verify the vibration isolation effect of the HVIP.
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Wang, Zhen, Chuanlin He, Yan Xu, Dong Li, Zhanyuan Liang, Wei Ding, and Lei Kou. "Static and Dynamic Analysis of 6-DOF Quasi-Zero-Stiffness Vibration Isolation Platform Based on Leaf Spring Structure." Mathematics 10, no. 8 (April 18, 2022): 1342. http://dx.doi.org/10.3390/math10081342.

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Multi-degree-of-freedom isolator with low stiffness is a fair prospect in engineering application. In this paper, a novel 6-DOF QZS vibration isolation platform based on leaf spring structure is presented. Its bearing capacity is provided through four leaf springs, and the quasi-zero-stiffness is realized by the force balance between the central spring and the suspension spring. 6-DOF vibration isolation is realized by the ball-hinge fixed design of a leaf spring. Through static and dynamic analysis, the following conclusions are brought. The stiffness of the leaf spring and the deformation of the central spring under static load are directly proportional to the bearing capacity of the isolation table. Besides, in order to ensure that the stiffness of the system is close to zero, the stiffness of the suspension spring and the inner spring should be as similar as possible. The vertical and horizontal displacement transmissibility tests of the isolation platform are carried out, in which the jumping phenomenon in the QZS vibration isolation platform is analyzed. By improving the damping of the structure and the length of the suspension spring, the dynamic vibration isolation process of the system can be more stable, the transmissibility can be reduced, and the vibration isolation effect can be enhanced.
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Lee, Dong-Hun, Young-Bok Kim, Soumayya Chakir, Thinh Huynh, and Hwan-Cheol Park. "Noninteracting Control Design for 6-DoF Active Vibration Isolation Table with LMI Approach." Applied Sciences 11, no. 16 (August 21, 2021): 7693. http://dx.doi.org/10.3390/app11167693.

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This paper proposes a novel control strategy for six degrees-of-freedom active vibration isolation tables. In these systems, the most challenging issue is to suppress the external vibrations and isolate the internal interactions while still preserving the system’s robustness when facing uncertainties. A noninteracting controller is designed to tackle these problems. The resulting control system is completely decoupled in the sense that each system output is independently controlled to follow the corresponding reference signal. In this paper, the model of an active vibration isolation table is firstly derived. Conditions for system stability and decoupled performance are then discussed. The control law is formulated using the linear matrix inequality approach, which results in optimal control gains for the control objectives. With the proposed controller, complex system characteristics can be handled more efficiently such that an effective system is designed to obtain good control performance. Finally, simulations and comparison studies were conducted, and the results validate the efficiency of the proposed scheme.
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Yi, Teng Da, Bing Li, and Nan Wang. "Analysis and Optimization of a Vibration Isolation Platform Based on 6-DOF Parallel Mechanism." Key Engineering Materials 625 (August 2014): 748–53. http://dx.doi.org/10.4028/www.scientific.net/kem.625.748.

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In this paper a 6-DOF(Degree of Freedom) vibration isolation platform with structural configuration of 3CPS (3 Cylindrical-Prismatic-Spherical)-1UPS (1 Universal-Prismatic-Spherical) parallel mechanism is proposed. Firstly, the dynamic model is developed through virtual work principle. The transfer function and the complex frequency response function were obtained from the dynamical equation. Then, 36 amplitude frequency diagrams are obtained from the frequency response function. By analyzing the 36 amplitude frequency diagrams, 10 vibration coupling terms were chosen. The range of the spring stiffness coefficient and the range of the damping coefficient of the magneto-rheological damper are determined by analyzing the acceleration transmissibility of the 10 vibration coupling terms. At last, an integrated optimization combining structural and controller optimization is developed. The optimal parameters of the parallel mechanism are obtained through Genetic Algorithm (GA). This work is significant for the prototype design and verification of the vibration isolator.
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Wang, Ping Ping, Lei Liu, and Qiu Ru Qian. "Dynamic Modeling and Control of Flexible Hexapod Platform for Micro-Vibration Isolation and Precision Tracking." Applied Mechanics and Materials 490-491 (January 2014): 412–20. http://dx.doi.org/10.4028/www.scientific.net/amm.490-491.412.

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Micro vibrations, produced by reaction flywheels, coolers, driving motors and other moving parts in spacecrafts, will result in jitters and performance degradation of sensitive optical payloads, such as laser communication platforms, space telescopes and staring cameras. In this paper, one hexapod platform with flexible ball joints is employed to suppress vibrations and steer the payload in 6-degree-of-freedom (DOF). At first, dynamic modeling of the flexible hexapod platform with two-stage hybrid isolation struts is derived. Then, a composite control strategy is proposed for vibration isolation and precision tracking. Finally, the simulation study is presented to validate the proposed control strategy.
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Zhou, Xubin, Weidong Chen, Fagang Zhao, Dapeng Sui, Qing Xiao, Xingtian Liu, Liping Zhou, and Quan Zhang. "Dynamic Modeling and Active Vibration Isolation of a Noncontact 6-DOF Lorentz Platform Based on the Exponential Convergence Disturbance Observer." Shock and Vibration 2021 (March 24, 2021): 1–18. http://dx.doi.org/10.1155/2021/6641863.

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In order to study the vibration isolation and positioning performance of the noncontact 6-DOF platform in the space microgravity environment, this paper presented a cosimulation model of a virtual prototype. Based on the model driven by biaxial noncontact Lorentz force actuators (NLFAs), an equivalent dynamic model has been established. In the meanwhile, the 6-DOF sliding mode robust controller with exponential convergence disturbance observer is developed. The mechanical system simulation model was designed using ADAMS, and the corresponding 6-DOF decoupling control system and disturbance observer programs were developed using MATLAB/Simulink. According to the mechatronics simulation results, the system can enable the floating platform to achieve micron-level posture positioning within 0.5 s. In vibration isolation simulation, the disturbance observer can predict the external disturbance input and compensate the control force more accurately so that the floating platform can effectively suppress low-frequency disturbance and step disturbance under the control of the sliding mode controller. And the displacement of the floating platform under the disturbance of 1–100 Hz frequency sweep is less than 1 μm.
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Joshi, Alok, and Won-jong Kim. "Modeling and Multivariable Control Design Methodologies for Hexapod-Based Satellite Vibration Isolation." Journal of Dynamic Systems, Measurement, and Control 127, no. 4 (November 30, 2004): 700–704. http://dx.doi.org/10.1115/1.2101842.

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A mathematical model of a six-degree-of-freedom (6-DOF) hexapod system for vibration isolation was derived in the discrete-time domain on the basis of the experimental data obtained from a satellite. Using a Box–Jenkins model structure, the transfer functions between six piezoelectric actuator input voltages and six geophone sensor output voltages were identified empirically. The 6×6 transfer function matrix is symmetric, and its off-diagonal terms indicate the coupling among different input/output channels. Various multi-input multi-output (MIMO) control techniques such as Linear Quadratic Gaussian and H∞ were proposed for active vibration isolation in the broadband up to 100 Hz. The simulation results using these controllers obtain 13 and 8 dB vibration attenuation at 25 and 35 Hz, respectively.
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Jiang, Min, Xiaoting Rui, Wei Zhu, Fufeng Yang, and Junjie Gu. "Control and experimental study of 6-DOF vibration isolation platform with magnetorheological damper." Mechatronics 81 (February 2022): 102706. http://dx.doi.org/10.1016/j.mechatronics.2021.102706.

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Liu, Yanqi, Wen Ji, Huangsen Gu, Erjie Deng, Xin Wang, and Chunfang Song. "Force transmissibility of a 6-DOF passive quasi-zero stiffness vibration isolation platform." Journal of Mechanical Science and Technology 35, no. 6 (May 20, 2021): 2313–24. http://dx.doi.org/10.1007/s12206-021-0504-5.

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Gil, Hyeong-Gyeun, and Kwang-San Kim. "Development of a 6-DOF Active Vibration Isolation System Using Voice Coil Motor." Transactions of the Korean Society for Noise and Vibration Engineering 20, no. 7 (July 20, 2010): 637–43. http://dx.doi.org/10.5050/ksnve.2010.20.7.637.

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Dissertations / Theses on the topic "6-DOF vibration isolation"

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Zhu, Tao. "Six degree of freedom active vibration isolation using quasi-zero stiffness magnetic levitation." Thesis, 2014. http://hdl.handle.net/2440/85036.

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Vibration is recognised as one of the most significant disturbances to the operation of mechanical systems. Many traditional vibration isolator designs suffer from the trade-off between load capacity and isolation performance. Furthermore, in providing sufficient stiffness in the vertical direction to meet payload weight requirements, isolators are generally overly stiff in the remaining five degrees of freedom (DOF). In order to address the limitations of traditional isolator designs, this thesis details the development of a 6-DOF active vibration isolation approach. The proposed solution is based on a magnetic levitation system, which provides quasi-zero stiffness payload support in the vertical direction, and inherent zero stiffness in the other five DOFs. The introduced maglev isolator also allows the static force and moment inputs from the payload to be adaptive-passively balanced using permanent magnets. In this thesis, the theoretical background of the proposed maglev vibration isolation method is presented, which demonstrates the ability of the maglev system to achieve the intended vertical payload support and stiffness in the six degrees of freedom. Numerical models for calculating the forces and torques in the proposed maglev system are derived, and the analysis of the cross-coupling effects between the orthogonal DOFs of the isolator is also presented based on the developed system models. A mechanism is introduced by which the cross-coupling effects can be exploited to achieve load balancing for static inputs using permanent magnet forces alone. Following the development of the theoretical model, the mechanical design of the maglev isolator is presented. The designs of the various control systems that are necessary to enable the operation of the maglev isolator are explained. The presented control algorithms achieve three functions: stabilisation of the inherently unstable maglev system, adaptive-passive support of the payload using the cross-coupling effects introduced previously, and autonomous magnet position tuning for online system performance optimisation. Following the discussion of the controller design, a 6-DOF skyhook damping system is presented. The active damping system creates an artificial damping effect in the isolation system to reduce the vibration transmissibility around the resonance frequency of the system. The vibration transmissibilities of the developed maglev isolator were measured in 6-DOF, and results are presented for various combinations of controller settings and damping gains. Through comparisons between the measured performance of the physical system and the predicted performance from theory, the developed maglev vibration isolator demonstrated its practical ability to achieve high performance vibration isolation in six degrees of freedom.
Thesis (Ph.D.) -- University of Adelaide, School of Mechanical Engineering, 2014
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Conference papers on the topic "6-DOF vibration isolation"

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Nguyen, The, Mohammad Elahinia, Walter W. Olson, and Paul Fontaine. "A 6-DOF vibration isolation system for hydraulic hybrid vehicles." In Smart Structures and Materials, edited by William W. Clark, Mehdi Ahmadian, and Arnold Lumsdaine. SPIE, 2006. http://dx.doi.org/10.1117/12.657909.

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Kim, Wong-Jong, Shobhit Verma, and Jie Gu. "Maglev 6-DOF Stage for Nanopositioning." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-42708.

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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.
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Chenyang Ding, A. A. H. Damen, and P. P. J. van den Bosch. "Robust Vibration Isolation of a 6-DOF system using modal decomposition and sliding surface optimization." In 2011 American Control Conference. IEEE, 2011. http://dx.doi.org/10.1109/acc.2011.5991084.

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Yao, Jiamin, Wei Zhuang, Jinyang Feng, Yang Zhao, Shaokai Wang, Shuqing Wu, Fang Fang, and Tianchu Li. "An Ultra-Low-Frequency Active Vertical Vibration Isolator With Horizontal Constraints for Absolute Gravimetry." In ASME 2021 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/imece2021-68008.

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Abstract Absolute gravimeters have been widely used as an important instrument in geological exploration and geophysics. To achieve a required measurement precision, it is necessary to integrate a vertical vibration isolator with ultra-low resonance frequency into the gravimeter. In this paper, an active vibration isolator designed on the basis of a BM-10 passive vibration isolation platform is presented. In the isolator, a seismometer placed next to the payload on the same plate outputs a voltage signal proportional to the payload’s velocity. According to this signal, a feedback circuit based on a PID controller controls two identical voice coil actuators to drive the platform synchronously. In this way, the vibration of the payload is suppressed. The BM-10 platform has 6-DOF passive vibration isolation originally, but its horizontal vibration isolation is proved unnecessary or even harmful in absolute gravimetry. Hence, two linear bushings are applied as a horizontal constraint to ensure that the payload only moves vertically in a straight line. Experiments show the resonance period of the isolator reaches approximately 88 s. In addition, the active vibration isolator has shown a much better performance for vibrations at low frequency than the passive isolator. In the future, the vibration isolator will be improved and then be integrated in the NIM-AGRb-1 atom-interferometry absolute gravimeter for the evaluation of its performance.
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Botelho, Rui M., and Richard E. Christenson. "Reducing Resonant Vibrations of Adjacent Base Isolation Systems Using Connected Control Method." In ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/detc2014-35515.

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The connected control method (CCM) is a vibration control strategy that uses damping devices between adjacent dynamic systems to impart dissipative forces upon one another for mitigating their fundamental resonant vibrations. CCM was originally conceived for civil applications to mitigate the resonant vibrations of adjacent high-rise buildings from seismic and wind excitations. This paper examines CCM as a potential vibration control strategy for mechanical applications, particularly for the case of adjacent base isolation systems. These systems typically have lightly damped fundamental resonant frequencies to provide effective isolation at the higher frequencies. The conventional approach to reduce the vibrations of these fundamental resonances is to add damping to the isolators, but at the expense of degraded isolation. For cases when the two or more base isolation systems are adjacent to each other, it is possible to apply CCM to mitigate their fundamental resonant vibrations by interconnecting them with damping devices. This paper first reviews the basic theory of CCM for adjacent one degree of freedom (DOF) mass-spring systems connected by a viscous damper, followed by analytical modeling and optimization of adjacent 6-DOF mass-spring systems connected by viscous dampers. In addition, experimental results using simplified base isolation systems connected by Taylor Devices viscous dampers are also presented to demonstrate the effectiveness of CCM. Results show that CCM can effectively reduce the resonant vibrations of adjacent base isolation systems without degrading the isolation effectiveness as long as their fundamental resonances are sufficiently separated.
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Kim, Won-jong, Himanshu Maheshwari, and Jie Gu. "Maglev Linear Actuator for Nanopositioning." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-33395.

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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.
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Chu, Xunchao, Zhenxing Li, and Kang Wu. "Simultaneous decoupling control of translation and rotation for a 6-DOF vibration isolator based on the Stewart platform." In 2022 IEEE International Instrumentation and Measurement Technology Conference (I2MTC). IEEE, 2022. http://dx.doi.org/10.1109/i2mtc48687.2022.9806626.

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