&lt;title&gt;Satellite ultraquiet isolation technology experiment (SUITE): electromechanical subsystems&lt;/title&gt;

Anderson, Eric H.; Evert, Michael E.; Glaese, Roger M.; Goodding, James C.; Pendleton, Scott C.; Camp, Donald; Jessen, Marty; Cobb, Richard; Erwin, R. Scott; Jensen, Jonathon

doi:10.1117/12.351568

Cited by 10 publications

(5 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The analogue outputs of the multimeter were then passed to the A/D inputs of the controller through the connection box. The electrical signal of the thermocouple (10), which was mounted upon the cold finger of a cryogenic cooler, through the conditioning amplifier (11), was supplied to the controller. This allows for the cooler operation in a closed loop mode.…”

Section: Practical Evaluation Of Sensorless Balancing Controller and mentioning

confidence: 99%

Sensorless Balancing of a Dual-Piston Linear Compressor of a Stirling Cryogenic Cooler

Doubrovsky

Veprik²,

Pundak³

2005

Cryocoolers 13

View full text Add to dashboard Cite

Long-life, highly reliable and low-cost miniature Stirling cryogenic coolers are the core components in a wide variety of cryogenically cooled electro-optic, high temperature superconductive and vacuum applications. The linear compressors of such coolers are known to be the major source of harmful vibration disturbances affecting the operation of these inherently vibration sensitive systems. The dual-piston approach to the design of the linear compressor yields intrinsically low vibration export and, therefore, is widely accepted across the industry. However, the residual vibration export originated from unavoidable technological tolerances, natural wear and contamination cannot be completely eliminated. The ultra-low vibration export from a dual-piston compressor may be attained using active balancing. A dedicated digital controller normally relies on internal sensors (e.g. LVDT) for direct measuring of the pistons' motion or an external sensor (e.g. accelerometer or load cell) for measuring the residual vibration export. This eventually complicates the entire design and makes the cooler more expensive and less reliable. The authors disclose the recent efforts made by Ricor towards the development, implementation and testing of a sensorless adaptive feed-forward controller for the balancing of dual-piston compressors. In this novel approach, the detection and synchronization of the pistons' velocities relies solely on the real-time data acquisition (motors' voltages and currents) and the general model of the linear "moving coil" or "moving magnet" motor. The attainable performance of the controller was evaluated through the full-scale testing performed on the Ricor model K535 linear dual-piston Stirling cryogenic cooler.

show abstract

Section: Practical Evaluation Of Sensorless Balancing Controller and mentioning

confidence: 99%

Sensorless Balancing of a Dual-Piston Linear Compressor of a Stirling Cryogenic Cooler

Doubrovsky

Veprik²,

Pundak³

2005

Cryocoolers 13

View full text Add to dashboard Cite

show abstract

“…Another approach for minimizing mechanical vibrations is to mount the SPM on a vibration-damped support. However, moving large masses in actively damped systems limits this solution to a relatively low bandwidth (Anderson et al 1999). In addition, this approach restricts applications where the SPM has to be integrated into machinery, such as mechanical working machines or airborne and spaceborne SPM (Drobek 2001).…”

Section: Introductionmentioning

confidence: 99%

Eliminating mechanical perturbations in scanning probe microscopy

Schitter¹,

Stemmer²

2002

Nanotechnology

View full text Add to dashboard Cite

This paper presents a method for cancelling mechanical vibrations in scanning probe microscopes by recording the vibrations with an auxiliary distance sensor and subsequently removing them from the topography signal. For the experimental verification, the auxiliary sensor was mounted in a commercial atomic force microscope (AFM) side by side with the probe tip. Combination of the signals from the AFM and distance sensor converts the microscope into a differential instrument, allowing for subtraction of the vibration-induced noise up to the control bandwidth of the AFM system. Imaging with sub-nanometre resolution in a noisy environment was demonstrated.

show abstract

“…However, counterforce control systems cannot provide direct pointing functionality and hence if host structure base motion is the primary disturbance source, motion based control might be the preferred solution. Example systems include the already discussed VISS [6] and SUITE [7] hexapods, among others.…”

Section: Background: Counter-force Controlmentioning

confidence: 99%

“…In the latter case, specialized gravity off load test equipment is often needed [4,5,6] to characterize the performance of the required passive isolation systems prior to launch, and additional systems such as launch locks are required to enable the isolation systems with corner frequencies below 8 to 10 Hz to survive launch loads.…”

Section: Introductionmentioning

confidence: 99%

“…Electromagnetic voice coils have also been a popular approach and have been combined with a wide range of passive damping methods. Some examples include the damped elastomer puck system from TRW [4,5], the viscous damper of the Vibration Isolation, Suspension, and Steering (VISS) flight experiment [6], and the damped flexure of the JPL hexapod demonstrator [SI.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Active/passive counter-force vibration control and isolation systems

Flint¹,

Evert

Anderson

et al.

2000 IEEE Aerospace Conference. Proceedings (Cat. No.00TH8484)

View full text Add to dashboard Cite

Active counter-force control has significant advantages over the more traditional motion based active vibration suppression for isolation of disturbance sources. In this paper, features of four specific actuators, two hybrid isolation struts, and three system level realizations are reviewed with a focus on vibration isolatiodsuppression to reduce cryocooler disturbance forces. All of the discussed hardware and systems are based on electromagnetic reaction mass actuators. Significant vibration reductions can be achieved with such systems. The best measured tonal performance for all three systems discussed exceeds two orders of magnitude (40 dB) of vibration reduction. Control bandwidth can exceed 500 Hz. The necessary actuators are also robust, compact, and lightweight. Two of the systems were realized with miniature actuators weighing 3.8 ounces (107 grams) and 3.12 ounces (88 grams) respectively. Such systems have significant promise for addressing critical vibration isolation needs for upcoming space missions such as SIM, NGST, TPF, SBL, etc., through isolation of onorbit noise sources such as cryocoolers and reaction wheels. They could also be quite useful for terrestrial applications in telecommunication, manufacturing, and semiconductor processing industries.

show abstract

<title>Satellite ultraquiet isolation technology experiment (SUITE): electromechanical subsystems</title>

Cited by 10 publications

References 3 publications

Sensorless Balancing of a Dual-Piston Linear Compressor of a Stirling Cryogenic Cooler

Sensorless Balancing of a Dual-Piston Linear Compressor of a Stirling Cryogenic Cooler

Eliminating mechanical perturbations in scanning probe microscopy

Active/passive counter-force vibration control and isolation systems

Contact Info

Product

Resources

About