![]() ![]() On the other hand, in helical microswimmers, propulsive forces on the nanocoil structure are generated due to the rotation of the microrobot about the axis of its helix. ![]() Robotic microswimmers with eukaryotic-like morphologies move in their fluid environments by oscillating their flexible elastic tails. (2009), there exists a microrobot size below which employing helical propellers and elastic tails is more efficient than pulling microbeads with field gradients. In contrast to employing helical propellers or elastic tails, using magnetic gradient pulling is far less efficient in terms of propulsion efficiency due to limitations on magnetic field sources. Magnetic microbeads are tiny rigid objects that are pulled through fluids using magnetic field gradients (Abbott et al., 2009). Bead-like (Yesin, Vollmers, & Nelson, 2006), eukaryotic-like (Behkam and Sitti, 2006, Khalil et al., 2016), and helical (Bell et al., 2007, Mahoney et al., 2011) shapes are the most widely-used morphologies for magnetic microswimmers. The type of the microswimmer morphology is another factor that should be taken into account for microrobot design. ![]() Among the two main classes of actuation methods for microswimmers, i.e., untethered magnetic actuation (Abbott et al., 2009, Honda et al., 1996) and molecular motors (Behkam & Sitti, 2006), using external magnetic fields for control of untethered microswimmers is more popular mainly because the former scales well in terms of microfabrication and wireless power transmission/control. Microrobots can be categorized based on their morphologies and actuators (Abbott et al., 2009). In in vitro or lab-on-a-chip applications, these robots can be used for protein-crystal handling (Tung et al., 2013) and cell manipulation/characterization (Sakar et al., 2010). In in vivo biomedical applications, these robotic microswimmers can be employed for minimally invasive therapeutic and diagnostic procedures (Cha et al., 2010, Ullrich et al., 2013). The low-frequency measurements of the camera.Swimming microrobots can be used for both in vivo and in vitro biomedical and micromanipulation applications. Space telescope (typically the primary and secondary ones), it is possible toĮstimate the line-of-sight error at the payload level by hybridizing them with The payload and in correspondence of the mirrors with the largest size in a Thanks to a set of accelerometers placed at the isolated base of ![]() Solar Array Drive Mechanism driving signal, by letting them work during the To reduce the microvibrations induced both by reaction wheel imbalances and Opens the doors to modern robust control techniques that robustly guarantee theĮxpected fine pointing requirements. Parameters in a unique Linear Fractional Transformation model. This framework allows the authors to easily include all systemĭynamics with an analytical dependency on varying and uncertain mechanical The elementary flexible bodies and mechanisms involved in a fine pointing A multi-body framework, the TITOP approach, is used to build all To the limits of performance and constrains the choice of the set of sensorsĪnd actuators. Physics and its uncertainties is then necessary in order to push control design Space missions together with the use of lighter and flexible structuresĭirectly come with the need of a robust pointing performance budget from the Download a PDF of the paper titled Advances in Fine Line-Of-Sight Control for Large Space Flexible Structures, by Francesco Sanfedino and 3 other authors Download PDF Abstract: The increased need in pointing performance for Earth observation and science ![]()
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