Browsing by Author "Vuorinen, Mari"

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    Adaptiiviset verkontihennysmenetelmät lujuuslaskentaohjelmistossa
    (2008) Vuorinen, Mari; Niiranen, Jarkko; Manninen, Timo; Insinööritieteiden ja arkkitehtuurin tiedekunta; Aalto, Jukka
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    Reaction-time responce of a large commercial aircraft
    (2010) Vuorinen, Mari; Kukkola, Tapani; Insinööritieteiden ja arkkitehtuurin tiedekunta; Insinööritieteiden korkeakoulu; School of Engineering; Paavola, Juha
    The reaction-time response of a large commercial aircraft is defined. Conservative values for the aircraft characteristics and for the impact speed are chosen. The aircraft is examined as a thin-walled tubular missile. The impact is assumed soft, and the target's effect on the reaction-time response is neglected. The reaction-time response is defined assuming a normal impact on a rigid wall. The reaction-time response is defined with the analytical Riera method and with the numerical explicit finite element method. The Riera force history is solved with the finite difference method. For the finite element method, two codes are used: AbaquslExplicit and LS-DYNA. The use of the Riera method is justified based on reference studies. The used finite element method is validated by simulating the impact of test missile 639. The missile is tested by VTT under SAFIR 2010 project IMPACT. The simulation results are compared to the corresponding test data. Additionally, a missile impact test from project IRIS 2010 is simulated. The outer shell of the aircraft is modelled, and an approximation for the misdistribution is made. Sensitivity to modelling assumptions is studied in order to get information on the adequacy of modelling. The results show that the sensitivity to modelling assumptions is small. The wings should be modelled more accurately in order to obtain the dominant frequency response in global structural analysis. A justified estimate for the reaction-time response of a large commercial aircraft is presented.