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When re-applying job history from an Agent, where the Module referenced in one of the jobs
has since been deleted, this job will be
failed automatically when re-applying the job history.
skipped automatically when re-applying the job history.
executed with the original Module configuration.
de-selected automatically when selecting jobs for reapply job history.
The audit trail of an Agent will show the following information:
When it was registered
When it signed in/out
Which jobs were executed
When it was reverted to a snapshot
1 and 2 only
1,2 and 3 only
1,2 and 4 only
1, 3 and 4 only
Which of the following tasks does NOT have Evaluators?
Query active directory user
Query computer properties
Query disk space
Query installed programs
Which of the following statements about Projects is/are true?
A new Module can be created while creating a new Project.
A disabled Project is still visible in the Project's folder list.
When a Module is disabled at the Modules section, it becomes automatically disabled in the
1 and 2 only
2 and 3 only
A security role has been configured with "Modify" access to Resources, but "Deny" access to
the specific Resource "Resource X". Actual access to "Resource X" will be
undefined, because the access rights contradict.
"Deny", because "Deny" always takes precedence over "Modify".
"Deny", because access rights on the object level take precedence.
"Modify", because access rights on the node level take precedence.
After an Agent has been reverted to a snapshot, an administrator can manually re-apply a change path by selecting the appropriate
jobs from the job history of the Agent.
jobs from the change tree of the Agent.
change path from the change tree of the Agent
change path from the audit trail of the Agent.
RES ES0-005 Exam (RES Automation Manager 2011 Basic) Detailed Information
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Aerodynamic Effects of Flexibility in Flapping Wings
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Recent work on the aerodynamics of flapping flight reveals fundamental differences in the mechanisms of aerodynamic force generation between fixed and flapping wings. When fixed wings translate at high angles of attack, they periodically generate and shed leading and trailing edge vortices as reflected in their fluctuating aerodynamic force traces and associated flow visualization. In contrast, wings flapping at high angles of attack generate stable leading edge vorticity, which persists throughout the duration of the stroke and enhances mean aerodynamic forces. Here, we show that aerodynamic forces can be controlled by altering the trailing edge flexibility of a flapping wing. We used a dynamically scaled mechanical model of flapping flight (Re approximately 2000) to measure the aerodynamic forces on flapping wings of variable flexural stiffness (EI). For low to medium angles of attack, as flexibility of the wing increases, its ability to generate aerodynamic forces decreases monotonically but its lift-to-drag ratios remain approximately constant. The instantaneous force traces reveal no major differences in the underlying modes of force generation for flexible and rigid wings, but the magnitude of force, the angle of net force vector and centre of pressure all vary systematically with wing flexibility. Even a rudimentary framework of wing veins is sufficient to restore the ability of flexible wings to generate forces at near-rigid values. Thus, the magnitude of force generation can be controlled by modulating the trailing edge flexibility and thereby controlling the magnitude of the leading edge vorticity. To characterize this, we have generated a detailed database of aerodynamic forces as a function of several variables including material properties, kinematics, aerodynamic forces and centre of pressure, which can also be used to help validate computational models of aeroelastic flapping wings. These experiments will also be useful for wing design for small robotic insects and, to a limited extent, in understanding the aerodynamics of flapping insect wings.
"4. Zhao et al. (2010) reported experimentally that the lift coefficient has a maximum value when the angle of attack is about 45 ? Fig. 9 ( b )shows the variation with the heaving amplitude in the average angle during one flapping period: when the heaving amplitude is 0.1, the average angle is nearly ? "
[Show abstract] [Hide abstract] ABSTRACT: A self-propelled flexible fin with heaving and pitching motions in a quiescent flow has been simulated by using the penalty immersed boundary method. The flexible fin can move freely in the horizontal direction and the body of the flexible fin moves passively along with the active head motion. The position of the head of the fin was described as a harmonic heaving oscillation in the vertical direction, while the inclination angle of the head was prescribed as a harmonic oscillation with a moving clamped condition for the heaving and pitching fin. The cruising speed and the swimming efficiency of the self-propelled fin were determined as functions of the bending stiffness (γ), the heaving amplitude (Ah), the pitching amplitude (Ap), the flapping frequency (f) and the phase difference (Δϕ) between Ah and Ap. We optimized the cruising speed and the swimming efficiency with respect to γ, f, Ah, Ap and Δϕ. For a certain range of Ap, the swimming efficiency of the heaving and pitching fin is larger than that of a heaving-only fin.
Full-text · Article · Oct 2016 · Journal of Anatomy
"This usually leads to a strongly coupled, complex fluidstructure interaction (FSI) problem associated with the aerodynamics and structural dynamics. Recently there is a remarkable increasing of studies on this topic, which are carried out by various means of high-tech-based methods including the high speed digital camera for the wing kinematics measurement23456, the digital particle image velocimetry (DPIV) for flow field reconstruction789, the dynamically scaled robotic insect models with man-made flexible wings [10,11] and the computational fluid and structural dynamics for simplified FSI analysis12131415161718. Although these studies have broaden and deepened our understanding of the flapping flexible wing aerodynamics, it still remains unclear yet on some structural dynamics problems, for example why there is tip snap phenomenon after the flapping wing obtained a steady state, and what role the structural damping plays exactly during flapping. "
[Show abstract] [Hide abstract] ABSTRACT: Flapping MAV is a recent area of extensive study because of its unique advantages including high maneuverability and information gathering capabilities. Numerous researchers have taken serious efforts in understanding and investigating the aerodynamics, flapping mechanisms and control implications. Moreover, the large flexibility of the wings leads to the study of complex fluid-structure interactions. Generally, most research has been dedicated towards the structural elasticity and natural frequencies rather than the effect of structural damping on the deformation of flapping wing. In this paper, finite element simulations of a flapping wing are tuned via static characterization and modal testing and compared with the DIC (digital image correlation) results. The amplitude of structural damping factors is evaluated and validated through simulation results and experimental results.
Full-text · Article · Dec 2015
"Studying the morphology and material composition of dragonfly wing veins and the wing membrane may contribute to improve the design of MAVs. Especially, the incorporation of wing veins has been shown to significantly improve the aerodynamic performance and wing stability of MAVs (Lentink et al. 2009; Zhao et al. 2009; Jongerius & Lentink, 2010; Dirks & Taylor, 2012). Besides its influence on mechanical stability, insect cuticle is also a source of colouration. "
[Show abstract] [Hide abstract] ABSTRACT: Dragonflies count among the most skilful of the flying insects. Their exceptional aerodynamic performance has been the subject of various studies. Morphological and kinematic investigations have showed that dragonfly wings, though being rather stiff, are able to undergo passive deformation during flight, thereby improving the aerodynamic performance. Resilin, a rubber-like protein, has been suggested to be a key component in insect wing flexibility and deformation in response to aerodynamic loads, and has been reported in various arthropod locomotor systems. It has already been found in wing vein joints, connecting longitudinal veins to cross veins, and was shown to endow the dragonfly wing with chordwise flexibility, thereby most likely influencing the dragonfly's flight performance. The present study revealed that resilin is not only present in wing vein joints, but also in the internal cuticle layers of veins in wings of Sympetrum vulgatum (SV) and Matrona basilaris basilaris (MBB). Combined with other structural features of wing veins, such as number and thickness of cuticle layers, material composition, and cross-sectional shape, resilin most probably has an effect on the vein's material properties and the degree of elastic deformations. In order to elucidate the wing vein ultrastructure and the exact localisation of resilin in the internal layers of the vein cuticle, the approaches of bright-field light microscopy, wide-field fluorescence microscopy, confocal laser-scanning microscopy, scanning electron microscopy and transmission electron microscopy were combined. Wing veins were shown to consist of up to six different cuticle layers and a single row of underlying epidermal cells. In wing veins of MBB, the latter are densely packed with light-scattering spheres, previously shown to produce structural colours in the form of quasiordered arrays. Longitudinal and cross veins differ significantly in relative thickness of exo- and endocuticle, with cross veins showing a much thicker exocuticle. The presence of resilin in the unsclerotised endocuticle suggests its contribution to an increased energy storage and material flexibility, thus to the prevention of vein damage. This is especially important in the highly stressed longitudinal veins, which have much lower possibility to yield to applied loads with the aid of vein joints, as the cross veins do. These results may be relevant not only for biologists, but may also contribute to optimise the design of micro-air vehicles.
Full-text · Article · Sep 2015
November 2016 · Proceedings - IEEE International Conference on Robotics and Automation
November 2016 · Bioinspiration & Biomimetics · Impact Factor: 2.35
November 2016 · Bioinspiration & Biomimetics · Impact Factor: 2.35
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Conference Paper: The effect of chord-wise flexibility on the aerodynamic force generation of flapping wings: Experime...
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