&lt;title&gt;Performance of a launch and on-orbit isolator&lt;/title&gt;

Boyd, Jim; Hyde, Tupper; Osterberg, Dave; Davis, Torey

doi:10.1117/12.436555

Cited by 11 publications

(5 citation statements)

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“…Active control systems are effective in controlling the vibrations of structural elements such as rods, columns, beams, plates, and shells. Active struts with vibration suppression capabilities have been studied by Boyd et al (2001), Quenon et al (2001), Fujita et al (1998), Song et al (1999), Dekens and Neat (1999), O'Brien et al (1998), Hyde and Davis (1998), Masters and Crawley (1997), Huang et al (1997), Darby and Pellegrino (1997), and Wada et al (1990). Active struts have primarily been used for vibration suppression to maintain precision positioning rather than a direct precision positioning function.…”

Section: Introductionmentioning

confidence: 99%

Performance of an Active Composite Strut for an Intelligent Composite Modified Stewart Platform for Thrust Vector Control

Doherty

Ghasemi‐Nejhad

2005

Journal of Intelligent Material Systems and Structures

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Adaptive or intelligent structures which have the capability for sensing and responding to their environment promise a novel approach to satisfying the stringent performance requirements of future space missions. This research effort focuses on the development and performance evaluation of an active composite strut (ACS) with precision positioning and active vibration suppression capabilities for use in space structures. Such ACS has potentials to be used as active strut members in Stewart platforms, modified Stewart platforms (MSPs), space truss structures, etc. The developed ACS utilizes piezoelectric actuators/sensors providing precision positioning and vibration suppression capabilities that would enhance mission performance of space structures by fine position-tuning, and potentially eliminating the nonoperational period of a satellite while minimizing the fuel consumption utilized for its position correction in a thrust vector control (TVC) application. Precision positioning of the ACS is achieved by extending or contracting its internal piezoelectric actuator. To magnify the positioning capabilities of a stack piezoelectric actuator, a miniature inchworm mechanism is designed and incorporated within the ACS. A precision positioning experimental setup is developed and employed to demonstrate the precision positioning capabilities of the developed ACS. The axial vibration suppression capability of the ACS can also be provided by its internal piezoelectric stack actuator, and is demonstrated employing a developed vibration suppression experimental setup. Analytical and finite element analysis numerical verification, simulation, and modeling of the vibration suppression capabilities of the ACS are presented. Active vibration suppression schemes, using finite element analyses, are employed to numerically demonstrate the vibration suppression capabilities of the developed ACS. The ACS housing is a composite tubing. The numerical and experimental results show that the proposed ACS offers a promising method for achieving fine tuning of positioning tolerances as well as minimizing the effects of disturbances generated during a thruster firing of a satellite for the TVC application using a MSP.

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Section: Introductionmentioning

confidence: 99%

Performance of an Active Composite Strut for an Intelligent Composite Modified Stewart Platform for Thrust Vector Control

Doherty

Ghasemi‐Nejhad

2005

Journal of Intelligent Material Systems and Structures

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“…54 Finally, Honeywell has bridged a gap between launch isolation and on-orbit isolation using a single isolation system capable of doing both jobs. 55 …”

Section: Launch Vehiclementioning

confidence: 97%

<title>Survey of state-of-the-art vibration isolation research and technology for space applications</title>

Winthrop¹,

Cobb²

2003

SPIE Proceedings

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A broad survey of the literature detailing the state-of-the-art and future research trends in vibration isolation for current and proposed space systems is presented. Terminology for vibration control is first defined. Next, the vibration isolation problem is discussed taking into account nonlinearities associated with variable parameters. It is followed by a discussion of some current space specific applications, illustrating the tremendous importance of vibration control technology for space and the challenges these applications present. Next, a discussion of vibration control elements is provided. Finally, a summary of semi-active control strategies is presented and conclusions are drawn about the state of the art.

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“…The same team also designed D-strut with elastic metal bellows, which was combining these three elements. Such suspension system was used, for example, for vibration isolation of Hubble telescope reaction wheel, which was described in Davis et al 2 Boyd et al 3 compared different settings of D-struts used in a hexapod for vibration isolation of payload. Davis et al 4 developed and Cobb et al 5 tested D-strut with actuator, which dramatically reduced vibrations in comparison with passive version, especially at low frequencies.…”

Section: Introductionmentioning

confidence: 99%

Influence of response time of magnetorheological valve in Skyhook controlled three-parameter damping system

Strecker

Roupec

Mazůrek

et al. 2018

Advances in Mechanical Engineering

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A three-parameter suspension system is often used for vibration isolation of sensitive devices especially in a space industry. This article describes the three-parameter suspension system with magnetorheological valve controlled by Skyhook algorithm. Simulations of such systems showed promising results. They, however, showed that the suspension performance is strongly influenced by magnetorheological valve response time. Results from simulations proved that the semiactive control of such system with response time of magnetorheological damper up to 4 ms outperforms any passive setting. The simulations were verified by an experiment on suspension system with magnetorheological valve with response time between 3.5 and 4.1 ms controlled by a Skyhook algorithm. Although the control algorithm was slightly modified in order to prevent instabilities of control loop caused by signal noise, the results from the experiment showed the same trends like the simulations.

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<title>Performance of a launch and on-orbit isolator</title>

Cited by 11 publications

References 0 publications

Performance of an Active Composite Strut for an Intelligent Composite Modified Stewart Platform for Thrust Vector Control

Performance of an Active Composite Strut for an Intelligent Composite Modified Stewart Platform for Thrust Vector Control

<title>Survey of state-of-the-art vibration isolation research and technology for space applications</title>

Influence of response time of magnetorheological valve in Skyhook controlled three-parameter damping system

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