this app is designed to solve a very simple 2D beam dynamic problems in mechanical and aerospace engineering fields. It calculate natural frequencies of mechanical structures such as buildings, aircraft, spacecraft, and many more. It illustrates a step by step process from user input data to computing results. It also reference the numerical solution method to solve for eigenvalues and eigenvectors of mechanical structures. Text book, reference technical papers, and example are included within this app for further reading about the finite element method for solving problem. this app also serves as an essential tool for distant learning. There are handy cross sectional of different geometry calculator included in this app. The finite element theory can be found in the embedded text books. It also contain reference resources of the numerical method that has been used to compute eigenvalues and eigenvectors.