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An improved force feedback control algorithm for active tendons.

Guo T, Liu Z, Cai L - Sensors (Basel) (2012)

Bottom Line: An active tendon, consisting of a displacement actuator and a co-located force sensor, has been adopted by many studies to suppress the vibration of large space flexible structures.The effectiveness of the algorithm is demonstrated on a structure similar to JPL-MPI.The results show that large damping can be achieved for the vibration control of large space structures.

View Article: PubMed Central - PubMed

Affiliation: School of Mechanical Engineering & Applied Electronics Technology, Beijing University of Technology, Beijing 100124, China. gtn@bjut.com

ABSTRACT
An active tendon, consisting of a displacement actuator and a co-located force sensor, has been adopted by many studies to suppress the vibration of large space flexible structures. The damping, provided by the force feedback control algorithm in these studies, is small and can increase, especially for tendons with low axial stiffness. This study introduces an improved force feedback algorithm, which is based on the idea of velocity feedback. The algorithm provides a large damping ratio for space flexible structures and does not require a structure model. The effectiveness of the algorithm is demonstrated on a structure similar to JPL-MPI. The results show that large damping can be achieved for the vibration control of large space structures.

No MeSH data available.


Related in: MedlinePlus

Frequency-response functions with three control strategies.
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f5-sensors-12-11360: Frequency-response functions with three control strategies.

Mentions: In order to compare the control effectiveness of the three control algorithm in the frequency region, a typical frequency-response function between the force applied in the middle of the truss and the displacement response on the top of arm 3 is shown in Figure 5 with three control algorithms. The active tendon is the synthetic fiber “Dynema” one. In fact, if the polyethylene tendon is adopted to attenuate the vibration, the comparative effectiveness of three control algorithm is more obvious. The integral feedback coefficient (gi = 0.044, i = 1, 2, 3), is selected to obtain the maximum damping ratio for the structure. The proportional integral feedback coefficient (the proportional coefficient kf = 1.1kc, the integral feedback coefficient gi = 0.0102, i = 1, 2, 3, are also selected to obtain the maximum damping ratio for the structure. The differential force feedback coefficients are set to kfi = 5.02 × 10−5 and the stiffness error is set to Δkci = 0.005kci, i = 1, 2, 3. The × in Figure 4 marks the pole locations of the first three modes. The differential force feedback can provide a higher damping ratio than the integral force feedback and the PI control algorithm on both high order modes and low order modes.


An improved force feedback control algorithm for active tendons.

Guo T, Liu Z, Cai L - Sensors (Basel) (2012)

Frequency-response functions with three control strategies.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3472888&req=5

f5-sensors-12-11360: Frequency-response functions with three control strategies.
Mentions: In order to compare the control effectiveness of the three control algorithm in the frequency region, a typical frequency-response function between the force applied in the middle of the truss and the displacement response on the top of arm 3 is shown in Figure 5 with three control algorithms. The active tendon is the synthetic fiber “Dynema” one. In fact, if the polyethylene tendon is adopted to attenuate the vibration, the comparative effectiveness of three control algorithm is more obvious. The integral feedback coefficient (gi = 0.044, i = 1, 2, 3), is selected to obtain the maximum damping ratio for the structure. The proportional integral feedback coefficient (the proportional coefficient kf = 1.1kc, the integral feedback coefficient gi = 0.0102, i = 1, 2, 3, are also selected to obtain the maximum damping ratio for the structure. The differential force feedback coefficients are set to kfi = 5.02 × 10−5 and the stiffness error is set to Δkci = 0.005kci, i = 1, 2, 3. The × in Figure 4 marks the pole locations of the first three modes. The differential force feedback can provide a higher damping ratio than the integral force feedback and the PI control algorithm on both high order modes and low order modes.

Bottom Line: An active tendon, consisting of a displacement actuator and a co-located force sensor, has been adopted by many studies to suppress the vibration of large space flexible structures.The effectiveness of the algorithm is demonstrated on a structure similar to JPL-MPI.The results show that large damping can be achieved for the vibration control of large space structures.

View Article: PubMed Central - PubMed

Affiliation: School of Mechanical Engineering & Applied Electronics Technology, Beijing University of Technology, Beijing 100124, China. gtn@bjut.com

ABSTRACT
An active tendon, consisting of a displacement actuator and a co-located force sensor, has been adopted by many studies to suppress the vibration of large space flexible structures. The damping, provided by the force feedback control algorithm in these studies, is small and can increase, especially for tendons with low axial stiffness. This study introduces an improved force feedback algorithm, which is based on the idea of velocity feedback. The algorithm provides a large damping ratio for space flexible structures and does not require a structure model. The effectiveness of the algorithm is demonstrated on a structure similar to JPL-MPI. The results show that large damping can be achieved for the vibration control of large space structures.

No MeSH data available.


Related in: MedlinePlus