How to solve the equation of motion of partially embedded Timoshenko or Euler-Bernoulli beams in Winkler foundations (see figure) using a Galerkin-based closed-form solution [1]
Reference
[1] LIU, Yun Fei et WANG, Yan Qing. Thermo-electro-mechanical vibrations of porous functionally graded piezoelectric nanoshells. Nanomaterials, 2019, vol. 9, no 2, p. 301. DOI:10.3390/nano9020301