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Two appropriate FE models are established, one is for an uncovered helicopter fuel tank without protection frame, and the other is for fuel tank with protection frame.
The relations among the protection frame, textile layer and rubber layer of the fuel tank are introduced.
The dynamic responses of the two types of fuel tanks impinging on the ground with velocities of 17.3 m/s are numerically simulated for the purpose of analyzing energy-absorbing capabilities of the textile layer and protection frame.
An interesting alternative currently used by many centers and in particular presented in Roudet et al. study (Roudet et al. 2015) is the protection frame with a tendon from the crow's feet (gracilis or semitendinosus).
Mechanical analysis permitted calculation of flexion amplitude for a ligament gap of 1 and 2 mm taking as initial angle the adjusting angle of pretension of the protection frame.
– (1 : Flexion angle of pretension of the frame with inter-suture gap = 0 mm, 2 : Protection frame, 3 : Delta flexion for inter-suture gap of 2 mm (ΔF 2 mm), 4 : Total flexion for inter-suture gap of 2 mm).
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Therefore, this robust control method is suitable for application to seismic protection of civil frame buildings.
Although the Leverage case has passed drop tests for protection, the thin frame is nowhere near as hefty or reassuring as my OtterBox.
Protection by a frame is a necessity (Shelbourne et al. 2001), permitting early mobilization to limit knee stiffness and quadricipital adherences and amyotrophy (Lindy et al. 1995) and to give rise to better functional recovery.
This paper deals with the seismic protection of building frames by means of external dissipative systems.
The IEEE 802.15.4 MAC layer implements several security features offering hardware hop-by-hop protection for exchanged frames.
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