کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1720339 | 1014248 | 2011 | 12 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Umbilical deployment modeling for tethered UAV detecting oil pollution from ship Umbilical deployment modeling for tethered UAV detecting oil pollution from ship](/preview/png/1720339.png)
Oil slick detection and guiding of oil recovery ship by using on board tethered UAV need a non-linear dynamic model for the aerial umbilical including variable length domain and material elasticity. Considering the flight phases constraints and the system definition, two continuous models are presented using a Lagrangian approach or an updated Lagrangian one, both including different kinds of boundary condition at the umbilical bottom end. At the winch position, during a take-off or landing (TOL) phase flight, a geometrical singularity occurs in the Lagrangian approach while in the updated Lagrangian one, a difference exists between the unstrained curvilinear coordinate velocity and the strained umbilical material point velocity. Properties of internal strain energy and non-linear strain measure permit to characterize the regularity of the longitudinal and transversal umbilical displacements. From the continuous models we deduce the discrete finite-element models. Numerical examples with until eleven nodes are given, including the case of an emergency flight phase. Applications of this captive aerial detection system are equally discussed.
Journal: Applied Ocean Research - Volume 33, Issue 4, October 2011, Pages 332–343