The necessary and sufficient condition of the stability of linear nonautonomous system under the frequently-acting perturbation has been given and proved on the
In this paper,we study the existence unipueness and stability of the periodic solutionsfor fourth-order nonlinear nonhomogeneous periodic systems with slowly ch
In this paper a singularly perturbed linear second order hyperbolic problem with zerothorder reduced equation is discussed.Firstly,an energy inequality of the s
A 20-DOF hybrid stress element based upon Mindlin plate theory is developed usingthe optimization design method for thin and moderately thick plates.Numerical t
This paper establishes the finite element equation for the spherical shell.The resonantfrequencies of the above shell under different boundary conditions are al