&lt;title&gt;Image stabilization testbed (ISTAT)&lt;/title&gt;

Anderson, Eric H.; Evert, Michael E.; Flannery, P.S.; Fowler, Bryce L.; Glaese, Roger M.; Janzen, Paul C.

doi:10.1117/12.438073

Cited by 3 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Substituting equation (1), equation (5) and the parameters in Table 1 into equation (6) gives x a ¼59.7 mm.…”

Section: (B) Displacementmentioning

confidence: 99%

“…1 The most important element in a hydraulic actuation system is the servo valve, whose dynamic characteristics greatly affect the performances of the whole hydraulic actuation system. High bandwidth servo valves are required in high-frequency actuation system applications, such as active vibration control, 2,3 high cycle fatigue test systems for aerospace structures, 4 highspeed motion simulators, 5 high-speed aerospace actuation systems 6 and high bandwidth flight motion simulators. 7 The conventional two-stage electro hydraulic servo valves have bandwidth of the order of 50 Hz and they are not suitable for high-speed applications.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A piezoelectric direct-drive servo valve with a novel multi-body contacting spool-driving mechanism: Design, modelling and experiment

Changbin

Zhang

2013

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

Stack-type piezoelectric actuators, which usually consist of several ceramic layers connected in series, are widely used in piezoelectric direct-drive servo valves (PDDSV). However, poor pulling force capacity of this kind of actuators affects the performances of the direct-drive servo valves. This article presents a new type of PDDSV, whose spool-driving mechanism is composed of a set of independent parts that are not fixed together but are in contact with each other. This multi-body contacting spool-driving mechanism provides bidirectional movement of the spool by a preloaded stack-type piezoelectric actuator and a driving disc spring. This prevents the stack-type piezoelectric actuator from bearing the pulling force due to the inertia and friction of the spool. Design of the proposed servo valve is illustrated in detail and its characteristics are also predicted. Based on a nonlinear dynamic model of the multi-body contacting spool-driving mechanism, a comprehensive dynamic simulation model of the proposed PDDSV is established. Static and dynamic characteristics of the proposed PDDSV have been studied experimentally and good agreements between experimental and simulation results are observed. The dynamic performances of the proposed PDDSV are compared with the existing piezoelectric servo valves, which demonstrate that the proposed PDDSV has satisfactory dynamic characteristics for high-frequency applications.

show abstract

“…Substituting equation (1), equation (5) and the parameters in Table 1 into equation (6) gives x a ¼59.7 mm.…”

Section: (B) Displacementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A piezoelectric direct-drive servo valve with a novel multi-body contacting spool-driving mechanism: Design, modelling and experiment

Changbin

Zhang

2013

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

show abstract

Velocity fluctuation reduction in vector Doppler ultrasound using a hybrid single/dual-beam algorithm

Steel

Fish

Ramnarine

et al. 2003

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

View full text Add to dashboard Cite

In order to reduce the fluctuations in the velocity magnitude estimate, we propose a modification to the standard algorithm for reconstructing the (two component) vector velocity from the measured Doppler shifts in two directions. This uses the standard dual-beam algorithm, combined with temporal smoothing, to find only the velocity angle, then uses the single-beam algorithm to estimate the velocity magnitude. We present initial data showing the significant reduction in velocity estimate fluctuation that this hybrid method achieves compared to the standard algorithm.

show abstract

Adaptive filtering and feed-forward control for suppression of vibration and jitter

Anderson¹,

Blankinship²,

Fowler³

et al. 2007

SPIE Proceedings

View full text Add to dashboard Cite

<title>Image stabilization testbed (ISTAT)</title>

Cited by 3 publications

References 0 publications

A piezoelectric direct-drive servo valve with a novel multi-body contacting spool-driving mechanism: Design, modelling and experiment

A piezoelectric direct-drive servo valve with a novel multi-body contacting spool-driving mechanism: Design, modelling and experiment

Velocity fluctuation reduction in vector Doppler ultrasound using a hybrid single/dual-beam algorithm

Adaptive filtering and feed-forward control for suppression of vibration and jitter

Contact Info

Product

Resources

About