In this work we deal with a scalar spectral mixed boundary value problem in a spacial junction of thin rods and a plate. Constructing asymptotics of the eigenvalues, we employ two equipollent asymptotic models posed on the skeleton of the junction, that is, a hybrid domain. We, first, use the technique of self-adjoint extensions and, second, we impose algebraic conditions at the junction points in order to compile a problem in a function space with detached asymptotics. The latter problem is involved into a symmetric generalized Green formula and, therefore, admits the variational formulation. In comparison with a primordial asymptotic procedure, these two models provide much better proximity of the spectra of the problems in the spacial junction and in its skeleton. However, they exhibit the negative spectrum of finite multiplicity and for these “parasitic” eigenvalues we derive asymptotic formulas to demonstrate that they do not belong to the service area of the developed asymptotic models.

Accepted:

DOI: 10.1051/m2an/2017047

Keywords: Junction of thin rods and plate, scalar spectral problem, asymptotics, dimension reduction, self-adjoint extensions of differential operators, function space with detached asymptotics

^{1}; Cardone, Giuseppe

^{1}; Nazarov, Sergey A.

^{1}

@article{M2AN_2018__52_2_481_0, author = {Bunoiu, Renata and Cardone, Giuseppe and Nazarov, Sergey A.}, title = {Scalar problems in junctions of rods and a plate {II.} {Self-adjoint} extensions and simulation models}, journal = {ESAIM: Mathematical Modelling and Numerical Analysis }, pages = {481--508}, publisher = {EDP-Sciences}, volume = {52}, number = {2}, year = {2018}, doi = {10.1051/m2an/2017047}, zbl = {1428.35038}, mrnumber = {3834433}, language = {en}, url = {http://www.numdam.org/articles/10.1051/m2an/2017047/} }

TY - JOUR AU - Bunoiu, Renata AU - Cardone, Giuseppe AU - Nazarov, Sergey A. TI - Scalar problems in junctions of rods and a plate II. Self-adjoint extensions and simulation models JO - ESAIM: Mathematical Modelling and Numerical Analysis PY - 2018 SP - 481 EP - 508 VL - 52 IS - 2 PB - EDP-Sciences UR - http://www.numdam.org/articles/10.1051/m2an/2017047/ DO - 10.1051/m2an/2017047 LA - en ID - M2AN_2018__52_2_481_0 ER -

%0 Journal Article %A Bunoiu, Renata %A Cardone, Giuseppe %A Nazarov, Sergey A. %T Scalar problems in junctions of rods and a plate II. Self-adjoint extensions and simulation models %J ESAIM: Mathematical Modelling and Numerical Analysis %D 2018 %P 481-508 %V 52 %N 2 %I EDP-Sciences %U http://www.numdam.org/articles/10.1051/m2an/2017047/ %R 10.1051/m2an/2017047 %G en %F M2AN_2018__52_2_481_0

Bunoiu, Renata; Cardone, Giuseppe; Nazarov, Sergey A. Scalar problems in junctions of rods and a plate II. Self-adjoint extensions and simulation models. ESAIM: Mathematical Modelling and Numerical Analysis , Volume 52 (2018) no. 2, pp. 481-508. doi : 10.1051/m2an/2017047. http://www.numdam.org/articles/10.1051/m2an/2017047/

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