Estimating structural strain in a rubber vibration isolator from acceleration measurements is a challenging problem because elastomers behave very differently from metals. Their stiffness is strongly frequency dependent, highly temperature sensitive, and inherently viscoelastic. Nevertheless, useful engineering estimates can often be obtained from vibration measurements… Read more
Introduction Many engineers are proficient at measuring strain and converting strain-gage output into stress using the elastic modulus and gage factor. Fewer have worked through the next step: reconstructing the applied forces and moments that produced those strains. This is the load identification problem, and… Read more
Kinetic & strain energy formulas can be used as a basis for Rayleigh-Ritz or finite element analysis of vibrating structures. Equations for common structures and loading conditions are given in strain_energy.pdf The cases include: Uniform Bar under a Constant Axial Load Bar under a General Axial… Read more