Dinamička analiza modifikovane helikopterske lopatice od kompozitnih materijala
Dynamic analysis of modified composite helicopter blade
Апстракт
U ovom radu izvršena je modalna analiza modifikovane lopatice helikoptera 'Gazela'. Modifikovana lopatica je kompletno kompozitna sa saćastom ispunom. Prikazan je metod određivanja modova oscilovanja i sopstvenih frekvencija. Modifikovana lopatica sastoji se od saćaste ispune, ramenjače od 3D usmerenog kompozita i tankih karbonskih ploča kao oplate. Da bi se odredila matrica krutosti ispune korišćen je metod ekvivalentnih masa. U cilju nalaženja optimalnog metoda za određivanje sopstvenih frekvencija ispitano je nekoliko poznatih metoda. Metod Lancosa pokazao je najtačnije rezultate kroz umereno procesorsko vreme kada je u pitanju određivanje sopstvenih frekvencija i modova oscilovanja kod struktura od kompozitnih materijala sa saćastim ispunama. Ovom metodom izračunata su prva četiri moda oscilovanja modifikovane kompozitne lopatice, i prikazani su rezultati modova oscilovanja i deformacione energije lopatice.
In the present study, modal analysis has been performed on modified Gazelle helicopter blade. The construction of the blade is fully composite with the honeycomb core. The approach to determining structure mode shapes and natural frequencies is presented. Modified blade consists of core material, 3D unidirectional composite spar and thin carbon composite facesheets as blade skin. To determine the stiffness of the honeycomb core, the equivalent mass approach was used. Several methods of eigenvalue extraction have been investigated in order to find optimal method which can be used in dynamic analysis of composite structures containing honeycomb cores. Among all extraction methods investigated, it was found that combined Lanczos method is most effective in terms of accuracy and CPU time for eigenvalue extraction in composite structures with honeycomb core having large number of degrees of freedom. Strain energies for first four mode shapes of modified helicopter blade have been calculated... using numerical approach and results are presented.
Кључне речи:
normal mode / natural frequencies / hexagonal honeycomb core / helicopter composite blade / carbon fiberИзвор:
FME Transactions, 2012, 40, 2, 63-68Издавач:
- Univerzitet u Beogradu - Mašinski fakultet, Beograd
Колекције
Институција/група
Mašinski fakultetTY - JOUR AU - Garinis, Dimitrios AU - Dinulović, Mirko AU - Rašuo, Boško PY - 2012 UR - https://machinery.mas.bg.ac.rs/handle/123456789/1580 AB - U ovom radu izvršena je modalna analiza modifikovane lopatice helikoptera 'Gazela'. Modifikovana lopatica je kompletno kompozitna sa saćastom ispunom. Prikazan je metod određivanja modova oscilovanja i sopstvenih frekvencija. Modifikovana lopatica sastoji se od saćaste ispune, ramenjače od 3D usmerenog kompozita i tankih karbonskih ploča kao oplate. Da bi se odredila matrica krutosti ispune korišćen je metod ekvivalentnih masa. U cilju nalaženja optimalnog metoda za određivanje sopstvenih frekvencija ispitano je nekoliko poznatih metoda. Metod Lancosa pokazao je najtačnije rezultate kroz umereno procesorsko vreme kada je u pitanju određivanje sopstvenih frekvencija i modova oscilovanja kod struktura od kompozitnih materijala sa saćastim ispunama. Ovom metodom izračunata su prva četiri moda oscilovanja modifikovane kompozitne lopatice, i prikazani su rezultati modova oscilovanja i deformacione energije lopatice. AB - In the present study, modal analysis has been performed on modified Gazelle helicopter blade. The construction of the blade is fully composite with the honeycomb core. The approach to determining structure mode shapes and natural frequencies is presented. Modified blade consists of core material, 3D unidirectional composite spar and thin carbon composite facesheets as blade skin. To determine the stiffness of the honeycomb core, the equivalent mass approach was used. Several methods of eigenvalue extraction have been investigated in order to find optimal method which can be used in dynamic analysis of composite structures containing honeycomb cores. Among all extraction methods investigated, it was found that combined Lanczos method is most effective in terms of accuracy and CPU time for eigenvalue extraction in composite structures with honeycomb core having large number of degrees of freedom. Strain energies for first four mode shapes of modified helicopter blade have been calculated using numerical approach and results are presented. PB - Univerzitet u Beogradu - Mašinski fakultet, Beograd T2 - FME Transactions T1 - Dinamička analiza modifikovane helikopterske lopatice od kompozitnih materijala T1 - Dynamic analysis of modified composite helicopter blade EP - 68 IS - 2 SP - 63 VL - 40 UR - https://hdl.handle.net/21.15107/rcub_machinery_1580 ER -
@article{ author = "Garinis, Dimitrios and Dinulović, Mirko and Rašuo, Boško", year = "2012", abstract = "U ovom radu izvršena je modalna analiza modifikovane lopatice helikoptera 'Gazela'. Modifikovana lopatica je kompletno kompozitna sa saćastom ispunom. Prikazan je metod određivanja modova oscilovanja i sopstvenih frekvencija. Modifikovana lopatica sastoji se od saćaste ispune, ramenjače od 3D usmerenog kompozita i tankih karbonskih ploča kao oplate. Da bi se odredila matrica krutosti ispune korišćen je metod ekvivalentnih masa. U cilju nalaženja optimalnog metoda za određivanje sopstvenih frekvencija ispitano je nekoliko poznatih metoda. Metod Lancosa pokazao je najtačnije rezultate kroz umereno procesorsko vreme kada je u pitanju određivanje sopstvenih frekvencija i modova oscilovanja kod struktura od kompozitnih materijala sa saćastim ispunama. Ovom metodom izračunata su prva četiri moda oscilovanja modifikovane kompozitne lopatice, i prikazani su rezultati modova oscilovanja i deformacione energije lopatice., In the present study, modal analysis has been performed on modified Gazelle helicopter blade. The construction of the blade is fully composite with the honeycomb core. The approach to determining structure mode shapes and natural frequencies is presented. Modified blade consists of core material, 3D unidirectional composite spar and thin carbon composite facesheets as blade skin. To determine the stiffness of the honeycomb core, the equivalent mass approach was used. Several methods of eigenvalue extraction have been investigated in order to find optimal method which can be used in dynamic analysis of composite structures containing honeycomb cores. Among all extraction methods investigated, it was found that combined Lanczos method is most effective in terms of accuracy and CPU time for eigenvalue extraction in composite structures with honeycomb core having large number of degrees of freedom. Strain energies for first four mode shapes of modified helicopter blade have been calculated using numerical approach and results are presented.", publisher = "Univerzitet u Beogradu - Mašinski fakultet, Beograd", journal = "FME Transactions", title = "Dinamička analiza modifikovane helikopterske lopatice od kompozitnih materijala, Dynamic analysis of modified composite helicopter blade", pages = "68-63", number = "2", volume = "40", url = "https://hdl.handle.net/21.15107/rcub_machinery_1580" }
Garinis, D., Dinulović, M.,& Rašuo, B.. (2012). Dinamička analiza modifikovane helikopterske lopatice od kompozitnih materijala. in FME Transactions Univerzitet u Beogradu - Mašinski fakultet, Beograd., 40(2), 63-68. https://hdl.handle.net/21.15107/rcub_machinery_1580
Garinis D, Dinulović M, Rašuo B. Dinamička analiza modifikovane helikopterske lopatice od kompozitnih materijala. in FME Transactions. 2012;40(2):63-68. https://hdl.handle.net/21.15107/rcub_machinery_1580 .
Garinis, Dimitrios, Dinulović, Mirko, Rašuo, Boško, "Dinamička analiza modifikovane helikopterske lopatice od kompozitnih materijala" in FME Transactions, 40, no. 2 (2012):63-68, https://hdl.handle.net/21.15107/rcub_machinery_1580 .