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1. Verfasser:	Andrés Palomino
Format:	Artículo científico
Sprache:	es
Veröffentlicht:	Escuela de Posgrados de la Fuerza Aérea Colombiana 2018
Schlagworte:	Educación Aeronave VLA análisis estructural certificación aeronáutica pruebas estructurales de ala
Online-Zugang:	https://www.redalyc.org/articulo.oa?id=673571177004
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Evaluación estructural alar de aeronave categoría VLA para certificación en Colombia Andrés Palomino Educación Aeronave VLA análisis estructural certificación aeronáutica pruebas estructurales de ala El presente reporte de caso muestra el trabajo y los resultados de la evaluación estructural del ala llevado a cabo sobre la aeronave de diseño y fabricación colombiana WA500-AG. El proceso consistió en la apropiación de una norma de diseño, el cálculo de las cargas estructurales, la identificación de los casos de carga más críticos, la construcción de un banco y un espécimen de pruebas, el sometimiento de la estructura a las cargas calculadas y la identificación y corrección de aspectos de diseño. Como resultado, se obtiene un ala que demuestra ser capaz de soportar los requerimientos estructurales, dando así cumplimiento a la normativa vigente. Todo este trabajo, está enmarcado en lo que sería la primera certificación de una aeronave nacional categoría VLA ante la Unidad Administrativa Especial de la Aeronáutica Civil. 2018 artículo científico 1909-7050 https://www.redalyc.org/articulo.oa?id=673571177004 es http://www.redalyc.org/revista.oa?id=6735 Ciencia y Poder Aéreo application/pdf Escuela de Posgrados de la Fuerza Aérea Colombiana Ciencia y Poder Aéreo (Colombia) Num.2 Vol.13

if (filemtime($filename) + $maxlifetime < time()) { unlink($filename); $count++; } } return $count; } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ protected function saveSession($sessId, $data): bool { $sessFile = $this->path . '/sess_' . $sessId; if ($handle = fopen($sessFile, 'w')) { $return = false; // Lock the file for exclusive access to avoid issues with multiple // processes writing session simultaneously: if (flock($handle, LOCK_EX)) { $return = fwrite($handle, $data); // Make sure that there's no trailing data by truncating the file to // the correct length: ftruncate($handle, strlen($data)); fflush($handle); flock($handle, LOCK_UN); } fclose($handle); if ($return !== false) { return true; } } // If we got this far, something went wrong with the file output... // It is tempting to throw an exception here, but this code is called // outside of the context of exception handling, so all we can do is // echo a message.

// Anecdotal testing Today and Yesterday seems to indicate destroy() // is called by the garbage collector and everything is good. // Something to keep in mind though. return 0; } /** * Write function that is called when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ public function write($sessId, $data): bool { if ($this->writesDisabled) { return true; } return $this->saveSession($sessId, $data); } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ abstract protected function saveSession($sessId, $data): bool; }

* * @return void */ public function writeClose() { // The assumption is that we're using PHP's ext/session. // session_write_close() will actually overwrite $_SESSION with an // empty array on completion -- which leads to a mismatch between what // is in the storage object and $_SESSION. To get around this, we // temporarily reset $_SESSION to an array, and then re-link it to // the storage object. // // Additionally, while you _can_ write to $_SESSION following a // session_write_close() operation, no changes made to it will be // flushed to the session handler. As such, we now mark the storage // object isImmutable. $storage = $this->getStorage(); if (! $storage->isImmutable()) { $_SESSION = $storage->toArray(true); session_write_close(); $storage->fromArray($_SESSION); $storage->markImmutable(); } } /** * Attempt to set the session name * * If the session has already been started, or if the name provided fails * validation, an exception will be raised. * * @param string $name * @return SessionManager * @throws Exception\InvalidArgumentException */ public function setName($name) { if ($this->sessionExists()) { throw new Exception\InvalidArgumentException( 'Cannot set session name after a session has already started'

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